An electrochemical apparatus includes a negative electrode plate. The negative electrode plate includes a negative electrode active material. The negative electrode active material includes silicon particles and graphite particles; based on a mass of the silicon particles, a mass percentage of the silicon element is A; in the negative electrode plate, based on a total quantity of the silicon particles and the graphite particles, a quantity proportion of the silicon particles is D, and a quantity proportion of the graphite particles is E; and the electrochemical apparatus has a capacity of B mAh when discharged from a rated full-charge voltage to 3.0 V at a rate of 0.2C, and has a capacity of C mAh when discharged to 2.75 V; where [(1.69+8.34A)*D+E]/[(0.42+9.6A)*D+E]>C/B>[(0.56+9.46A)*D+E]/[(0.42+9.6A)*D+E].
A battery includes a cell, the cell includes a housing, an electrode assembly, a pole, and a bonding member, and the electrode assembly is accommodated in the housing. The housing includes a first surface in a thickness direction of the battery, and the housing is provided with a first avoidance opening running through the first surface along the thickness direction of the battery. The pole is disposed at the first avoidance opening, the bonding member is disposed between the pole and the housing, and the bonding member is configured to bond the pole to the housing. In this way, the pole may be at least partially disposed in the housing, and the pole may be connected to the outside via the first avoidance opening.
A battery cell (10) and an electric device. The battery cell (10) comprises a housing (100), an electrode assembly (200) disposed in the housing (100), and an electrode terminal (310) disposed at a wall portion of the housing (100), wherein the electrode assembly (200) comprises a plurality of first electrode sheets (210) and a plurality of second electrode sheets (220) which stacked in a first direction (X), a first empty foil area (211) is formed at a first corner of each first electrode sheet (210), each second electrode sheet (220) is provided with a first notch (221), and when observed in the first direction (X), the first empty foil areas (211) at least partially overlap with the first notches (221); and the electrode terminal (310) is electrically connected to the first empty foil areas (211), and the electrode terminal (310) does not protrude from the housing (100) in a length direction (Y), a width direction (Z) and a thickness direction of the housing (100). A space that is reserved between the electrode assembly (200) and the housing (100) and used for accommodating the first empty foil areas (211) is small, so that the energy density of the battery cell (10) can be improved, and when the battery cell (10) is subjected to an external force or falls, the possibility of a short circuit caused by the first empty foil areas (211) coming into contact with the second electrode sheets (220) is also smaller. The electrode terminal (310) does not protrude from the housing (100) in the length direction (Y) of the housing (100), the width direction (Z) of the housing (100) and the thickness direction of the housing (100), so that the possibility of the electrode terminal (310) interfering with other components can be reduced, thereby facilitating a reduction in the complexity of subsequent preparation processes.
An electrochemical apparatus includes a positive electrode plate, the positive electrode plate includes a positive electrode current collector and a positive electrode active material layer disposed on one or two sides of the positive electrode current collector, and the positive electrode active material layer includes a positive electrode active material. A ratio of Dv99 of the positive electrode active material to thickness H1 of the positive electrode active material layer on a single side of the positive electrode current collector satisfies 0.5≤Dv99/H1≤0.9. Agglomeration regions with a bright spot having a diameter D0 greater than or equal to 20 μm are observed on a surface of the positive electrode active material layer under a scanning electron microscope, and the agglomeration regions have a number density less than or equal to 5 pcs/cm2 per unit area on the surface of the positive electrode active material layer.
H01M 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
5.
COMPOSITE CURRENT COLLECTOR, POSITIVE ELECTRODE SHEET, ELECTROCHEMICAL DEVICE, AND ELECTRIC APPARATUS
A composite current collector, including a metal substrate layer and a functional layer located on a surface of the metal substrate layer; where the functional layer is analyzed using an energy dispersive spectrometer, and based on a total number of atoms of the C element, the O element, and a metal element in the functional layer, an atomic percentage of the C element in the functional layer is x, an atomic percentage of the O element in the functional layer is y, and an atomic percentage of the metal element in the functional layer is z, satisfying: 5%≤x≤25%, 10%≤y≤30%, and 55%≤z≤85%. The functional layer with specific element contents on the surface of the metal substrate layer, a coverage of a coating on a surface of the composite current collector can be effectively improved while electrical performance is ensured, thereby improving the safety of the electrochemical device.
An electrochemical device includes an electrode assembly. The electrode assembly includes a positive electrode plate. The positive electrode plate includes a positive current collector and a positive active material layer disposed on the positive current collector. The positive active material layer includes a positive active material and graphene. At least a part of the graphene is disposed on surfaces of particles of the positive active material. The technical solution of this application not only increases a compacted density of the positive active material layer and an energy density of the electrochemical device, but also reduces polarization and increases charging speed of the electrochemical device.
H01M 4/583 - Carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
7.
POLYANIONIC COMPOUND AND PREPARATION METHOD THEREFOR, POSITIVE ELECTRODE MATERIAL, POSITIVE ELECTRODE SHEET, SECONDARY BATTERY, AND ELECTRONIC DEVICE
A polyanionic compound has the following chemical formula: Na2+xMn1−yMySi2−zM′zO6−tNkXpYq(1), where in formula (1), M is selected from Ni, Fe, Cu, Zn, Mg, Al, or a combination thereof, M′ is selected from Ge, Sn, Ti, or a combination thereof, X is selected from S, Se, or a combination thereof, and Y is selected from F, Cl, or a combination thereof, where −0.2
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
A battery includes an electrode plate and a tab. The electrode plate includes a current collector and an active material layer disposed on the current collector. The tab is connected to the current collector. The tab protrudes beyond the electrode plate along a width direction of the electrode plate. Along the width direction of the electrode plate, the tab includes a first region and a second region. The first region is located between the second region and the active material layer, a thickness of the first region is t1, and a thickness of the second region is t2, and 0.5%≤(t1−t2)/t1≤5%.
A secondary battery and an electrical device, the secondary battery comprising: a pouch package (10), an electrode assembly (20), and tabs (30), wherein the pouch package (10) comprises a main body portion (11), a first sealing portion (12), and a second sealing portion (13); the electrode assembly (20) is arranged in the main body portion (11); the main body portion (11) comprises a first wall (113) and a second wall (114); the first wall (113) and the second wall (114) are arranged at an angle; the first sealing portion (12) is connected to the first wall (113), and the second sealing portion (13) is connected to the second wall (114); and a gap is formed between the second sealing portion (13) and the first sealing portion (12) in a second direction (Y). Each tab (30) comprises a tab adhesive (32), and the tab adhesive (32) comprises a tab adhesive main body and an extended portion (322) integrally connected to the tab adhesive main body. The tab adhesive main body is adhered to the pouch package (10), and the projection of the extended portion (322), when viewed in a third direction (Z), falls within the gap. The distance D1 between the extended portion (322) and the second sealing portion (13) in the second direction (Y) satisfies: 0.5mm≤D1≤3mm. In this way, the safety and reliability of the secondary battery can be improved.
A secondary battery and an electronic apparatus. The secondary battery comprises: a packaging bag, an electrode assembly, and a first tab. The packaging bag comprises a main body part and a first sealing part. The electrode assembly is accommodated in the main body part. The main body part comprises a first end wall, a second end wall, and a first side wall. The first sealing part is connected to the first side wall. The electrode assembly comprises an electrode assembly body and a plurality of first polar members extending from the electrode assembly body. The plurality of first polar members comprise at least two first sub-polar members and at least two second sub-polar members. The at least two first sub-polar members are folded in the direction of the first end wall and stacked to form a first current collection part. The at least two second sub-polar members are folded in the direction of the second end wall and stacked to form a second current collection part. The second current collection part and the first current collection part are both electrically connected to the first tab. By means of the above solution, wasted space in the height direction of the secondary battery can be reduced, which is beneficial to the improvement of the battery capacity.
A secondary battery, a manufacturing method therefor, and an electronic apparatus. The secondary battery comprises a casing, a pole assembly, and an electrode assembly. The electrode assembly is accommodated in the casing. The casing is provided with a first main wall, a second main wall, and a first side wall. The first main wall and the second main wall are oppositely arranged in a first direction. The first side wall is connected between the first main wall and the second main wall. The pole assembly comprises a pole, and the pole penetrates through the first side wall. The electrode assembly comprises a main body portion and a first tab group extending from the main body portion. The first tab group comprises at least two first tabs and at least two second tabs. The at least two first tabs are folded in the direction of the first main wall and stacked to form a first folded part. The at least two second tabs are folded in the direction of the second main wall and stacked to form a second folded part. The second folded part and the first folded part are both electrically connected to the pole. By means of the above solution, the volumetric energy density of the secondary battery can be improved.
An electrochemical apparatus includes a positive electrode plate and an electrolyte. The positive electrode plate includes a positive electrode active material layer. The positive electrode active material layer includes a positive electrode active material. The positive electrode active material includes a lithium composite oxide. The lithium composite oxide includes the lithium element and at least one element selected from the cobalt element, the nickel element, the manganese element, and the aluminum element. A surface layer of the positive electrode active material has a rock salt phase structure and includes the tungsten element. Based on a total mass of the positive electrode active material, a mass percentage of the tungsten element is B, where 0.01%≤B≤1%. The electrolyte includes an ionic liquid represented by a formula R:
An electrochemical apparatus includes a positive electrode plate and an electrolyte. The positive electrode plate includes a positive electrode active material layer. The positive electrode active material layer includes a positive electrode active material. The positive electrode active material includes a lithium composite oxide. The lithium composite oxide includes the lithium element and at least one element selected from the cobalt element, the nickel element, the manganese element, and the aluminum element. A surface layer of the positive electrode active material has a rock salt phase structure and includes the tungsten element. Based on a total mass of the positive electrode active material, a mass percentage of the tungsten element is B, where 0.01%≤B≤1%. The electrolyte includes an ionic liquid represented by a formula R:
A positive electrode plate includes a current collector, and a positive electrode protection layer and a positive active material layer disposed on the current collector in sequence. The positive electrode protection layer includes inorganic particles, a first conductive material, and a binder. The binder includes a water-soluble polymer metal salt. The first conductive material includes a conductive oxide containing a doping element. A first metal element in the conductive oxide includes at least one of a Group IVA metal element and a Group IIIA metal element. The doping element includes at least one of a Group IIIA non-metal element, a Group VA element, or a Group VIIA 10 element. A mass ratio of the doping element to the first metal element is 1: (10 to 200), and a mass ratio of the first metal element to a metal element in the inorganic particles is 1: (3 to 9).
A battery cell and an electric device. The battery cell comprises a case and a pressure relief assembly, wherein the case is provided with an accommodating space and an electrolyte injection hole in communication with the accommodating space; and the pressure relief assembly covers the electrolyte injection hole, and the pressure relief assembly comprises an adapter, a sealing member and a pressure relief member, the case, the adapter, the sealing member and the pressure relief member being stacked in sequence in a first direction, the adapter comprising a first main body portion and a first weld mark portion, the first main body portion being provided with a first side wall arranged in a circumferential direction, and the first weld mark portion connecting the first side wall to the case. The safety of the battery cell is improved.
Provided in the present application are a battery cell and an electric device. The battery cell comprises a laminated electrode assembly, wherein the electrode assembly comprises a plurality of first electrode sheets and a plurality of second electrode sheets, which are stacked in a first direction; a corner of each first electrode sheet has a first notch and a first empty foil area; a corner of each second electrode sheet has a second notch and a second empty foil area; when observed in the first direction, the first empty foil area at least partially overlaps with the second notch, the second empty foil area at least partially overlaps with the first notch, and the first empty foil area is spaced apart from the second empty foil area; and a plurality of first empty foil areas are stacked in the first direction, and a plurality of second empty foil areas are stacked in the first direction. Therefore, a space that is reserved between the electrode assembly and a housing and used for accommodating the first empty foil areas and the second empty foil areas can be reduced, the energy density of the battery cell can be improved, and when the battery cell is subjected to an external force or falls, the electrode assembly is less likely to shake relative to the housing, and the battery cell is also less likely to experience a short circuit.
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
A positive electrode plate includes a positive current collector, a primer coating disposed on at least one surface of the positive current collector, and a positive active material layer disposed on a surface of the primer coating. The primer coating includes inorganic particles, a conductive agent, and a binder. A number of conductive agent particles agglomerated on the surface of the primer coating within an area of 2700 mm2 is less than or equal to 2. The electrochemical device containing the positive electrode plate of this application exhibits a high level of safety performance, low-temperature discharge performance, and cycle performance simultaneously.
A hard carbon material, having a first characteristic peak from 15° to 35° and a second characteristic peak from 25° to 28° in an X-ray diffraction pattern of the hard carbon material. A starting position of the first characteristic peak is A°, an ending position of the first characteristic peak is B°, and B−A≥8°. A peak intensity of the first characteristic peak is I1, a peak intensity of the second characteristic peak is I2, and 0.1≤I2/I1≤3.0. When a negative electrode plate prepared using the hard carbon material as an active material is subjected to charge and discharge test with lithium metal as a counter electrode to obtain a differential capacity curve, the negative electrode plate has four reversible lithium intercalation peaks and three or four reversible lithium deintercalation peaks within a voltage range of 0 V to 0.4 V.
The present application discloses a secondary battery and an electrical device. The secondary battery comprises a packaging bag, an electrode assembly and a first tab; the packaging bag comprises a main body portion, a first top sealing portion and a first side sealing portion; the main body portion comprises a first top wall and a first side wall; the first top sealing portion is connected to the first top wall and is bent in a first direction; the first side wall is located on one side of the first top wall in a second direction; the first side sealing portion is connected to the first side wall; in the second direction, a first gap is formed between the first side sealing portion and the first top sealing portion; the first tab comprises a first metal strip and a first tab adhesive surrounding the first metal strip; one end of the first metal strip is electrically connected to the electrode assembly; the first tab adhesive is adhered to the packaging bag; and the other end of the first tab penetrates through the first tab adhesive and the first gap to extend out of the packaging bag. By means of the arrangements, the capacity of the secondary battery provided in the present application can be improved.
Disclosed in the present application are a battery cell and an electrical device. The battery cell comprises a casing and a pressure relief assembly; the casing is provided with an accommodation space and a liquid injection hole communicated with the accommodation space; the pressure relief assembly covers the liquid injection hole; the pressure relief assembly comprises an adapter component, a sealing component and a pressure relief component; the casing, the adapter component, the sealing component and the pressure relief component are sequentially stacked in a first direction; the adapter component comprises a first main body part and a first weld mark part; the projection of the sealing component on the adapter component in the first direction is a first projection; the first projection is located within the first main body part; the first weld mark part is arranged around the peripheral side of the first projection; the first weld mark part and the first projection are spaced apart; and the first weld mark part is welded to the casing. The battery cell provided by the present application is highly safe.
The present application discloses a battery cell, a secondary battery, and an electric device. The battery cell comprises a plurality of electrode sheets; each electrode sheet comprises a current collector and active substance coatings; the electrode sheet has a first region covered with the active substance coatings and a second region not covered with the active substance coatings; the first region is provided with a clearance notch; the second region forms a tab of the battery cell; among the plurality of stacked electrode sheets, for two adjacent electrode sheets, the first region of one electrode sheet is provided with a clearance notch so as to expose the second region of the other electrode sheet; the width of the electrode sheet is W mm, the area of the clearance notch is S1 mm2, the area of the second region is S2 mm2, and the thickness of the battery cell is H; when H is greater than 7 mm, S1+S2＜A*W is satisfied, and A is 3.6 mm; or, when H is less than or equal to 7 mm, S1+S2＜B*W is satisfied, and B is 1.6 mm. By means of such design, when a bare battery cell is formed by stacking, the tabs are accommodated in the main body region of the bare battery cell, and there is no need to perform multi-tab transfer welding, thereby improving space utilization; moreover, by setting the maximum value of S1+S2, it is ensured that the overall energy density of the battery cell is increased.
00120122), 200≤a≤5000. The oxide layers are arranged on the surfaces of the positive electrode current collector, so that a secondary battery can have high energy density while improving the safety performance of the secondary battery.
Provided are an electrode assembly and a battery. Electrode sheets (100) and separators of the electrode assembly are wound multiple times to form a flat electrode body (10), wherein at least one electrode sheet (100) is provided with bumps (200), a straight part (11) of the electrode body (10) has a first thickness L1 in a first direction, and a corner part (12) of the electrode body (10) has a second thickness L2 in a second direction, L1 and L2 satisfying: 1.5≤L1/L2≤2.4. When an electrode sheet (100) is provided with bumps (200), the interlayer interaction force of the electrode body (10) is appropriate, and the bumps (200) are not prone to deformation under the action of a winding stress and an expansion force, such that the bumps (200) can stably support the separators (13). When the electrode assembly is applied to the battery, the performance of the battery can also be optimized.
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
Disclosed in the present application are an electrode sheet, an electrode assembly and a battery. The electrode sheet comprises a main body portion and a plurality of protrusions, wherein each protrusion is formed by means of bending part of the electrode sheet towards one side of the main body portion, and has an inner surface connected to one surface of the main body portion and an outer surface connected to another surface of the main body portion; and the area of the outer surface of each protrusion is S1, the projection area of the outer surface of each protrusion in the direction of the thickness of the electrode sheet is S2, and S1 and S2 meet 1.01≤S1/S2≤1.7. Reduction in damage to the electrode sheet is facilitated, and the electrode sheet is not stretched and extended too much; and the protrusions provided have good structural stability, are configured to support a separator, and cause an appropriate gap between the main body portion and the separator, thereby facilitating an improvement in the performance of a battery.
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
25.
ELECTRODE PLATE, ELECTROCHEMICAL APPARATUS, AND ELECTRONIC DEVICE
An electrode plate includes a current collector, an active substance layer, a tab, and a first insulation adhesive layer. The active substance layer is disposed on surface of the current collector, and the active substance layer is provided with a first groove and a second groove running through the bottom of the first groove to the current collector. The current collector is partially exposed within the second groove. The tab is accommodated in the first groove and the second groove and connected to the current collector. The first insulation adhesive layer is disposed on a side of the first groove facing away from the current collector, and projections of the first insulation adhesive layer and the tab along a thickness direction of the current collector are located within the first groove of the active substance layer.
H01M 50/536 - Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
An electrode sheet (300), an electrode assembly and a battery. The electrode sheet (300) comprises a first surface perpendicular to the thickness direction of the electrode sheet (300), wherein the first surface comprises a bump region (310), and a plurality of protrusions (311) are formed in the bump region (310); there is a spacing between the bump region (310) and an edge of the first surface; and the area of the bump region (310) is Y, the projected area of the first surface in the thickness direction of the electrode sheet (300) is E, and Y and E satisfy: 0.1≤Y/E≤0.98. The setting of an appropriate area proportion of the plurality of first protrusions (311) is facilitated; the first protrusions (311) can provide effective support for a separator (50), such that the plurality of first protrusions (311) can effectively buffer a winding stress during a winding process of the electrode assembly and an expansion force for expansion of the electrode assembly, thereby improving the electrolytic-solution infiltration effect of the electrode assembly and ameliorating the interface problem of an electrode; and when applied to a battery, the electrode sheet (300) can improve the cycling performance of the battery.
Disclosed in the present application are an electrode sheet, an electrode assembly and a battery. The surface of an active material layer of the electrode sheet facing away from a current collector is provided with a protrusion point area, a tab area and an end clearance area. The electrode sheet comprises a plurality of first protrusion parts distributed in the protrusion point area, the plurality of first protrusion parts protruding towards the same side of the electrode sheet in the thickness direction of the electrode sheet. The end clearance area is arranged at an end part of the protrusion point area in the length direction of the electrode sheet and extends to an edge of the electrode sheet. The tab area extends to an edge of the electrode sheet in the width direction of the electrode sheet, a tab assembly being provided in the tab area and spaced apart from the protrusion point area. Configuring the protrusion point area, the tab area and the end clearance area of the electrode sheet to be combined with each other can effectively ameliorate an interface problem caused by squeezing between electrode layers, thus improving the cycle performance of batteries.
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 50/533 - Electrode connections inside a battery casing characterised by the shape of the leads or tabs
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
28.
LITHIUM-ION BATTERY, ELECTROCHEMICAL APPARATUS, AND ELECTRONIC DEVICE
A lithium-ion battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte, where the electrolyte includes a first additive, and the first additive includes at least one of a compound represented by formula I-A or a compound represented by formula II-A as defined in the specification of this application. The lithium-ion battery satisfies: 0.05≤Cpositive/X≤1.5, where Cpositive mg/mm2 represents a surface density of a positive electrode active substance layer of the positive electrode plate, and X % represents a mass percentage of the first additive in the electrolyte.
A battery pack includes a first casing, a battery module, and a second casing. The first casing has a first opening. The battery module is accommodated in the first casing. The second casing is connected to the first casing, the second casing includes a first sub-casing and a second sub-casing, the first sub-casing is connected to the first casing and covers at least a part of the first opening, and the second sub-casing is connected to the first casing. The first sub-casing and/or the second sub-casing is configured to be openable.
H01M 10/6563 - Gases with forced flow, e.g. by blowers
H01M 10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
H01M 50/204 - Racks, modules or packs for multiple batteries or multiple cells
H01M 50/262 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders with fastening means, e.g. locks
H01M 50/284 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders with incorporated circuit boards, e.g. printed circuit boards [PCB]
30.
POUCH, ELECTROCHEMICAL DEVICE, AND ELECTRONIC DEVICE
A pouch includes a first pouch body and a second pouch body connected to each other. A first cavity is recessed in a first pouch body. A second pouch body covers the first cavity so that the first pouch body and the second pouch body jointly close around to form the accommodation cavity. The first pouch body includes a first wall portion oriented toward the second pouch body. The first wall portion includes a first wall face oriented toward the accommodation cavity and a third wall face oriented away from the accommodation cavity. A thickness of the first wall portion is H1. The second pouch body includes a second wall portion oriented toward the first pouch body. The second wall portion includes a second wall face oriented toward the accommodation cavity and a fourth wall face oriented away from the accommodation cavity.
An electrochemical apparatus includes a housing, an electrode assembly, and a first conductive plate. The housing includes a main body portion and a sealing structure. The main body portion includes a first end wall and a second end wall opposite to each other in a first direction, a first wall and a second wall opposite to each other in a second direction, and a first side wall and a second side wall opposite to each other in a third direction. The sealing structure includes a first sealing portion connected to the first end wall and a second sealing portion connected to the first side wall. The first sealing portion folds in a direction towards the first wall. The first conductive plate includes a first surface facing the first wall and a second surface facing the second wall. An insulation adhesive connects the first conductive plate and the first sealing portion.
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
H01M 50/178 - Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
H01M 50/186 - Sealing members characterised by the disposition of the sealing members
H01M 50/536 - Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
The present application provides a secondary battery and an electronic device. The secondary battery comprises a positive electrode sheet, a negative electrode sheet, and an electrolyte, wherein the positive electrode sheet comprises a positive electrode material layer, the positive electrode material layer comprises lithium cobalt oxide, the lithium cobalt oxide comprises a nickel element, and the electrolyte comprises a boron trifluoride complex, lithium difluorophosphate and a boron-containing additive. The present application can improve the low-temperature cycle performance and the floating charge performance of the secondary battery.
maxminavgmaxminavgmaxavgavg is 1.20 to 2.99. According to the present application, the electrochemical device has both good low temperature cycle performance and good high temperature stability.
An anode including a current collector and an anode active material layer disposed on the current collector are provided. The anode active material layer includes first oriented particles having a first tilt angle θ1 inclined with respect to the direction parallel to the current collector, and second oriented particles having a second tilt angle θ2 inclined with respect to the direction parallel to the current collector. The first tilt angle θ1 and the second tilt angle θ2 are different and both not greater than 70°.
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/133 - Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 4/1393 - Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
35.
ELECTROCHEMICAL DEVICE AND PREPARATION METHOD THEREFOR, AND ELECTRONIC DEVICE
The present application provides an electrochemical device and a preparation method therefor, and an electronic device. The electrochemical device comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive electrode sheet, a negative electrode sheet and a selective lithium-ion permeable membrane, a positive electrode side and a negative electrode side that are independent from each other are formed on two sides of the selective lithium-ion permeable membrane, and the air permeability of the selective lithium-ion permeable membrane is greater than or equal to 4000 s/100mL; the electrolyte comprises a positive electrolyte and a negative electrolyte, the positive electrode sheet and the positive electrolyte are accommodated on the positive electrode side, and the negative electrode sheet and the negative electrolyte are accommodated on the negative electrode side; and the positive electrolyte and the negative electrolyte are different. The aforementioned arrangement can improve the kinetics and high-temperature performance of the electrochemical device.
Provided are a secondary battery and an electronic device. The secondary battery comprises a positive electrode sheet, a negative electrode sheet and an electrolyte; the positive electrode sheet comprises a positive electrode material layer, the positive electrode material layer comprising lithium iron phosphate; and the electrolyte comprises a boron trifluoride-dimethyl carbonate complex, lithium difluorophosphate and a boron-containing additive. The positive electrode sheet and the electrolyte can work in conjunction with each other to simultaneously improve the low-temperature discharge performance and the high-temperature storage performance of the secondary battery.
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0567 - Liquid materials characterised by the additives
H01M 10/0568 - Liquid materials characterised by the solutes
H01M 4/136 - Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
A secondary battery and an electronic apparatus. The secondary battery comprises a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte. The negative electrode sheet comprises a negative current collector and a negative electrode material layer arranged on at least one surface of the negative current collector; the negative electrode material layer comprises a negative electrode active material, the specific surface area of the negative electrode active material being c m2/g; the negative electrode active material comprises a basal plane and an edge plane, the proportion of the edge plane being a. The electrolyte comprises fluoro linear ester; on the basis of the mass of the electrolyte, the mass percent of the fluoro linear ester is d%, 5≤d≤65, 0.0015≤c/d≤2, and 0.0015≤a/d≤0.12. The electrolyte comprising the fluoro linear ester and controlling the values of d, c/d, a/d within said ranges can improve the cycle performance of secondary batteries under high-voltage and high-temperature conditions and also help to improve the quick charging performance of the secondary batteries.
A battery cell includes a housing assembly provided with an aperture, an electrode assembly, a conductive strip, and a feed-through assembly including a first gasket, a second gasket, a conductive terminal, and a rivet. The first gasket is disposed on an outer surface of the housing assembly. The second gasket includes an integrally formed second gasket body disposed on an inner surface of the housing assembly and an annular sleeve at least partly located in the aperture. The conductive terminal is disposed on a side of the second gasket facing back from the first gasket. The rivet passes through the first gasket, the aperture, the annular sleeve, the second gasket body, and the conductive terminal, and is electrically connected to the conductive terminal. The rivet abuts against the first gasket and the second gasket to form a seal at the aperture.
A negative electrode includes a negative current collector, a first negative active material layer and a second negative active material layer. The first negative active material layer is arranged on one side of a first portion of the negative current collector, and the second negative active material layers are arranged on two sides of a second portion, different from the first portion, of the negative current collector. A ratio of a weight per unit area of the first negative active material layer to a weight per unit area of the second negative active material layer on the negative current collector is 0.47 to 0.52, and a ratio of a compacted density of the first negative active material layer to a compacted density of the second negative active material layer is 0.9 to 1.1.
The present application relates to the technical field of batteries, and discloses an electrode assembly and an electrochemical apparatus. The electrode assembly comprises a battery cell body, multiple first tab units and a first welding plate, the multiple first tab units being connected to the battery cell body. Some of the first tab units are clustered to form a first tab group, and the remaining first tab units clustered to form a second tab group; along a first direction, the first welding plate has a first surface and a second surface opposite to each other, the first surface facing the battery cell body and making insulated contact with the first tab units, and the second surface facing away from the battery cell body. The first tab group is bent to abut against the second surface, and the second tab group is bent to overlap with and electrically connect to the first tab group. In the present application, the first tab group and the second tab group may be welded, with external conductive sheets, etc., on the same surface of the first welding plate in a third direction to form a staggered configuration, effectively reducing the space occupied in the first direction, reducing the volume of the electrode assembly, and helping to improve the energy density of the electrochemical apparatus.
An insulating adhesive, a tab assembly, and a secondary battery. The secondary battery comprises an electrode assembly, a tab assembly, and a packaging pouch; the electrode assembly is accommodated in the packaging pouch; the packaging pouch comprises a sealing part; the tab assembly comprises tabs and insulating adhesives respectively arranged on two sides of respective tabs; and the tabs are connected to the electrode assembly and pass through the sealing part to extend out of the packaging pouch. The insulating adhesive comprises a first insulating adhesive layer, a second insulating adhesive layer and a third insulating adhesive layer which are sequentially stacked in a first direction; the second insulating adhesive layer comprises a cross-linked polymer; and the degree of crosslinking of the cross-linked polymer ranges from 20% to 70%. The insulating adhesive of the secondary battery of the present application is not prone to warping, and has a good sealing effect.
An insulating adhesive and a secondary battery. The insulating adhesive comprises a first insulating adhesive layer, a second insulating adhesive layer and a third insulating adhesive layer, which are stacked in sequence along a first direction. A degree of swelling of the insulating adhesive when soaked in dimethyl carbonate for 4 hours at room temperature is less than or equal to 5%. Packaging tension between the insulating adhesive and a packaging bag of the secondary battery is high, and a sealing effect is good.
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
The present application discloses an insulating member, a tab assembly, a battery cell, a battery, and an electric device. The insulating member is configured to be connected to a tab, and comprises a first base layer, a first packaging layer, and a second packaging layer, wherein the first base layer is located between the first packaging layer and the second packaging layer, and the melting point A of the first base layer satisfies A≥185°C. When the temperature rises significantly, the insulating member is melted, and thus the tab comes into contact with a metal layer of an electrode assembly or a battery cell casing, resulting in a short circuit. The first base layer having a relatively high melting point is provided, thereby reducing the risk of a short circuit caused by the melting of the first base layer.
The present application discloses an insulating member, a tab assembly, a battery cell, a battery, and an electrical device. The insulating member comprises a first insulating member and a second insulating member; the first insulating member and the second insulating member are configured to be connected to the two sides of a tab in the thickness direction; the first insulating member comprises a first substrate layer, and the melting point of the first substrate layer is higher than the melting point of the second insulating member. The first insulating member and the second insulating member are arranged on the two sides of the tab, and the melting point of the first substrate layer is higher than the melting point of the second insulating member, so that when the temperature rise of the tab intensifies, the risk of a short circuit caused by the melting of the first substrate layer leading to exposure of the tab on the side where the first substrate layer is located, thermal damage to a separator of the battery cell and contact of the tab with an adjacent electrode sheet, can be reduced; additionally, the risk of a short circuit occurring between adjacent first and second electrode sheets can also be reduced.
An electrochemical device includes an electrode assembly, a packaging shell, and an adhesive component. The packaging shell includes a main portion and a seal edge portion. The electrode assembly is disposed in the main portion. The seal edge portion includes a first section and a second section that are folded. The second section includes a first end and a second end. The first section connects the main portion and the first end. The second end is disposed between the first section and a lateral edge of the main portion. The adhesive component is adhered between the lateral edge of the main portion and the second section. The second section is connected to the adhesive component. Along a thickness direction of the electrode assembly, an end of the adhesive component extends beyond the second end of the second section, and the adhesive component wraps the second end.
An electrode assembly of a secondary battery includes an anode electrode plate, the anode electrode plate includes an anode current collector and an anode active material layer, and the anode active material layer includes an anode active material. A first surface of the anode active material layer has been subjected to a lithium supplementing process treatment, and an active lithium is formed during a formation process of the anode electrode plate. A recessed portion provided in the first surface can serve as a lithium-ion transport channel.
An electrode sheet (10) and a secondary battery. The electrode sheet comprises a current collector (11), a first insulating layer (12), a second insulating layer (13), a first adapter portion (14a) and a second adapter portion (14b), wherein the current collector (11) comprises a first metal layer (112), a polymer layer (111) and a second metal layer (113), which are sequentially arranged, the first metal layer (112) having a first surface (1121) facing away from the polymer layer (111), the second metal layer (113) having a second surface (1131) facing away from the polymer layer (111), and in the widthwise direction of the current collector (11), the current collector (11) comprising a coating section (11a) and an empty foil section (11b), which are connected to each other; the first insulating layer (12) is arranged on the coating section (11a) on the first surface (1121) and extends to the empty foil section (11b); the second insulating layer (13) is arranged on the coating section (11a) on the second surface (1131) and extends to the empty foil section (11b); the first adapter portion (14a) is electrically connected to the current collector (11) on the first surface (1121) of the empty foil section (11b), the distance between the first adapter portion (14a) and the first insulating layer (12) is L1 mm, and 0 mm≤L1≤1 mm; and the second adapter portion (14b) is electrically connected to the current collector (11) on the second surface (1131) of the empty foil section (11b), the distance between the second adapter portion (14b) and the second insulating layer (13) is L2 mm, and 0 mm≤L2≤1 mm. The piercing of an isolation film (20) by burrs of a metal layer can be reduced, thereby decreasing the risk of a short circuit of a battery.
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
An electrode sheet, a battery cell, and an electrical device. The electrode sheet comprises a current collector (300), two active substance layers, and two transition layers. The current collector (300) comprises a support layer (10), and a first conductive layer (11) and a second conductive layer (12) that are arranged on the two sides of the support layer (10) in a first direction. One active substance layer (102) is arranged on the side of the first conductive layer (11) away from the support layer (10), and the other active substance layer (102) is arranged on the side of the second conductive layer (12) away from the support layer. One transition layer (22) is arranged between at least a part of the first conductive layer (11) and the corresponding active substance layer (102) and protrudes out of the active substance layer (102) in a second direction, and the other transition layer (22) is arranged between at least a part of the second conductive layer (12) and the corresponding active substance layer (102) and protrudes out of the active substance layer (102) in the second direction. Each active substance layer (102) comprises active substance particles, and the average particle size of the active substance particles ranges from 5 μm to 20 μm. Each transition layer comprises solid particles, and the average particle size of the solid particles ranges from 500 nm to 1500 nm. The electrode sheet can improve the structural strength.
The present application relates to the technical field of energy storage, and in particular to a cell and a secondary battery. The cell comprises a first electrode sheet, a second electrode sheet, a separator, and a first insulating member; the polarity of the second electrode sheet is opposite to that of the first electrode sheet; the separator is arranged between the first electrode sheet and the second electrode sheet; and the first electrode sheet, the separator and the second electrode sheet are wound in a winding direction to form an electrode assembly. In the winding direction, the first electrode sheet comprises a first winding start section located on a first layer of the innermost circle of the electrode assembly; and the first winding start section has a first winding start end. The first insulating member is arranged on two surfaces of a part of the first winding start section and extends beyond the first winding start end in a first direction; the portion extending beyond the first winding start end is a first part of the first insulating member; and the first direction is the length direction of the first electrode sheet. The first part can shield burrs of the first electrode sheet at the first winding start end, so as to protect the separator between the first electrode sheet and the second electrode sheet, thereby improving the safety of the cell.
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
A negative electrode material includes a carbon-based material. In a nitrogen adsorption/desorption test, the negative electrode material satisfies: S1/S2≥20%, and S2/S≥15%. S1 represents an adsorption volume of pores with a pore size less than or equal to 2 nm in the negative electrode material, and 0.0003 cm3/g≤S1≤0.001 cm3/g. S2 represents an adsorption volume of pores with a pore size greater than 2 nm and less than or equal to 10 nm in the negative electrode material, and 0.0008 cm3/g≤S1≤0.0025 cm3/g. S represents an adsorption volume of pores with a pore size less than or equal to 30 nm in the negative electrode material.
An electrochemical apparatus, includes a packaging bag accommodating an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate includes a positive electrode current collector having an aluminum foil and element silicon. A mass percentage of the element silicon in the positive electrode current collector is 0.03%-0.13%. The positive electrode current collector includes: a first surface and a second surface opposite to each other; and a single-sided region having a first portion. The second surface in the first portion is located on an outer surface of the electrode assembly. A positive electrode active material layer is provided on the first surface and an inactive material layer is provided on the second surface respectively, in the single-sided region. The inactive material layer includes an inactive material including an inorganic oxide and/or an elemental nonmetal.
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0567 - Liquid materials characterised by the additives
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
An electrochemical apparatus includes a housing, a conductive member, an electrode assembly, and an insulating member. The housing has a first wall, and the first wall is provided with a first through hole. The conductive member covers the first through hole. The electrode assembly is accommodated in the housing and is electrically connected to the conductive member. The insulating member is arranged between the conductive member and the first wall, the insulating member has a second through hole, and along a first direction, at least a part of a projection of the conductive member is located within both the first through hole and a second through hole. A convex portion is disposed between a surface of the first wall facing the conductive member and a surface of the conductive member facing the first wall
A negative electrode material, containing a carbon-based material, where an average surface roughness of the negative electrode material is Ra, and 1.2 nm≤Ra≤30 nm. The negative electrode material of this application possesses a relatively high gravimetric capacity and excellent kinetic properties, so that a secondary battery containing the negative electrode material achieves both a high energy density and high fast-charge performance. A secondary battery containing the negative electrode material is also provided.
A negative electrode material is provided. The negative electrode material comprises a carbon-based material. In a nitrogen adsorption-desorption test of the negative electrode material, 0.004 cm3/g≤S≤0.030 cm3/g, wherein S is an adsorption volume of pores with a pore diameter of 3 nm to 35 nm in the negative electrode material. In a charge-discharge test of a button battery prepared by using lithium as a negative electrode and using the negative electrode material as a positive electrode, a gravimetric capacity of the negative electrode material measured when the button battery is discharged to −5 mV is Cap A, and the gravimetric capacity of the negative electrode material measured when the button battery is discharged to a voltage of 5 mV is Cap B, 10 mAh/g≤Cap A−Cap B≤20 mAh/g.
A negative electrode material including a carbon-based material. In a thermogravimetric test of the negative electrode material, the negative electrode material has an exothermic peak within a temperature range of 600° C. to 800° C. in an air atmosphere. The negative electrode material of this application has excellent kinetic performance, thereby effectively improving discharge rate performance of a secondary battery including the negative electrode material.
An electrochemical device includes a negative electrode, a positive electrode, a separator, and an electrolyte. The positive electrode includes a positive electrode active material containing a doping element, where the doping element includes one or more selected from the group consisting of aluminum, magnesium, zirconium, titanium, and lanthanum; and based on a mass of the positive electrode active material, a mass percentage of the doping element is b %, where 0.01≤b≤3. The electrolyte includes a polynitrile additive.
H01M 10/0567 - Liquid materials characterised by the additives
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
An electrochemical device of this application includes a positive electrode, a negative electrode, and an electrolyte, where the positive electrode includes a positive electrode active material, the positive electrode active material includes element A, and element A is selected from at least one of La, Y, or Nb; based on a mass of the positive electrode active material, a mass percentage of element A is x %; the electrolyte includes a compound represented by formula (I); and based on a mass of the electrolyte, a mass percentage of the compound represented by formula (I) is a %.
An electrochemical device of this application includes a positive electrode, a negative electrode, and an electrolyte, where the positive electrode includes a positive electrode active material, the positive electrode active material includes element A, and element A is selected from at least one of La, Y, or Nb; based on a mass of the positive electrode active material, a mass percentage of element A is x %; the electrolyte includes a compound represented by formula (I); and based on a mass of the electrolyte, a mass percentage of the compound represented by formula (I) is a %.
An electrochemical apparatus includes an electrode plate. The electrode plate includes a current collector and an active material layer disposed on the surface of the current collector, and in an unwinding state of the electrode plate, a plurality of non-coated regions extend along width direction of the electrode plate on edges of the current collector, an electrode tab connecting sheet is provided with on the surface of each non-coated region, and the electrode tab connecting sheet is electrically connected to the non-coated region; where thickness L1 of the electrode tab connecting sheet satisfies: 3 μm≤L1≤35 μm, and/or fracture strength S1 of the electrode tab connecting sheet satisfies: 200 MPa≤S1≤880 MPa.
H01M 50/533 - Electrode connections inside a battery casing characterised by the shape of the leads or tabs
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 50/534 - Electrode connections inside a battery casing characterised by the material of the leads or tabs
H01M 50/536 - Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
59.
NEGATIVE ELECTRODE MATERIAL AND ELECTROCHEMICAL APPARATUS
A negative electrode material including a silicon-carbon material. The silicon-carbon material contains element silicon, element carbon, element oxygen, and a metal element. Based on a mass of the silicon-carbon material, a mass percentage of element silicon is a, where 10%≤a≤90%; and a mass percentage of the metal element is x, where 0.01%
An electrode plate, where the electrode plate includes a current collector, an active material layer, and a tab connection sheet, and when the electrode plate is in an unfolded state, the current collector includes a first part and a second part in a width direction of the electrode plate, the active material layer is disposed on a surface of the first part, the tab connection sheet overlaps with a surface of the second part to form an overlap region, and the tab connection sheet is welded to the surface of the second part to form an electrical connection to the second part, where in a length direction of the electrode plate, an area ratio of a weld mark to a welding region is greater than or equal to 20%, and a length ratio of the welding region to the overlap region is greater than or equal to 60%.
H01M 50/536 - Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
H01M 4/70 - Carriers or collectors characterised by shape or form
H01M 50/474 - Spacing elements inside cells other than separators, membranes or diaphragmsManufacturing processes thereof characterised by their position inside the cells
61.
NEGATIVE ELECTRODE MATERIAL, SECONDARY BATTERY, AND ELECTRONIC DEVICE
A negative electrode material includes a carbon-based material. In an X-ray diffraction pattern of the negative electrode material tested by X-ray diffractometry, a diffraction peak a is exhibited at a diffraction angle 2θ of 43° to 44°, a diffraction peak b is exhibited at a diffraction angle 2θ of 45° to 47°, an intensity of the diffraction peak a is Ia, and an intensity of the diffraction peak b is Ib, and Ia/Ib>1.
An electrochemical apparatus includes an electrode plate. The electrode plate includes a current collector, an active material layer arranged on a surface of the current collector, and a plurality of electrode tab connection portions, where each electrode tab connection portion includes a first part and a second part, and in an unfolded state of the electrode plate, the first parts of the plurality of electrode tab connection portions extend from an edge of the current collector along a width direction of the electrode plate and are spaced apart from each other, and the second parts are arranged on surfaces of the first parts and are electrically connected to the first parts.
H01M 50/536 - Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
H01M 50/533 - Electrode connections inside a battery casing characterised by the shape of the leads or tabs
H01M 50/534 - Electrode connections inside a battery casing characterised by the material of the leads or tabs
H01M 50/586 - Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
63.
ELECTROCHEMICAL APPARATUS AND ELECTRONIC APPARATUS
The present application provides an electrochemical apparatus and an electronic apparatus. The electrochemical apparatus comprises an electrolyte, a separator, a positive electrode sheet and a negative electrode sheet; the electrolyte comprises a compound represented by formula (I); based on the mass of the electrolyte, the mass percentage content of the compound represented by formula (I) is A%, where 30≤A≤80; the separator comprises a porous substrate and a porous coating arranged on at least one side of the porous substrate, the porosity of the separator being 25%-35%. The present application regulates and controls the structure of the separator and components of the electrolyte and combines same, such that the OCPD cycle performance of the electrochemical apparatus is improved by means of the synergy of the separator and the electrolyte.
A positive electrode plate includes a positive electrode current collector and a positive electrode active material layer. A safety coating is provided between the positive electrode current collector and the positive electrode active material layer, and the safety coating is disposed on a surface of the positive electrode current collector. The safety coating contains substance I, and the substance I is formed by dehydration of a first substance via a drying process of the positive electrode plate, where the first substance includes silica sol and/or alumina sol. The surface of the current collector of the positive electrode plate is provided with the safety coating, where the safety coating has good high-temperature resistance and can effectively protect the aluminum foil at high temperatures, thereby enhancing the thermal safety performance of the lithium-ion battery.
An electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate; and the positive electrode plate, the negative electrode plate, and the separator are stacked. An outermost electrode plate of the electrode assembly is a single-sided positive electrode plate. The single-sided positive electrode plate includes a positive electrode current collector, a first positive electrode material layer, and a second positive electrode material layer stacked sequentially. The first positive electrode material layer is located between the positive electrode current collector and the second positive electrode material layer. The second positive electrode material layer is adjacent to the separator. The first positive electrode material layer includes a first positive electrode active substance, a first binder, and a first conductive agent.
An electrode terminal includes a first portion and a second portion arranged in a first direction. The first and second portions are connected to the electrode assembly and have, respectively, a first connection region and a second connection region. The sealing member is connected to the electrode terminal and disposed on one side of the electrode assembly in a second direction perpendicular to the first direction. In an extension direction of the electrode terminal, the first connection region has a first edge away from the sealing member and a second edge close to the sealing member, and the second connection region has a third edge away from the sealing member and a fourth edge close to the sealing member. A minimum distance between the first and third edges is D1, a minimum distance between the second and fourth edges is D2, and D1 and/or D2 is greater than 0.
H01M 10/0585 - Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
H01M 50/186 - Sealing members characterised by the disposition of the sealing members
H01M 50/536 - Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
H01M 50/54 - Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
H01M 50/55 - Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
67.
SECONDARY BATTERY AND ELECTRONIC APPARATUS INCLUDING SAME
A secondary battery including an electrode assembly, a tab assembly, and a packaging pouch. The electrode assembly is accommodated in the packaging pouch. The packaging pouch includes a sealing portion, the tab assembly includes tabs and insulating adhesives, and the tabs are connected to the electrode assembly and run through the sealing portion to extend out of the packaging pouch. The insulating adhesives are disposed on the tabs and connect the tabs and the packaging pouch. The insulating adhesive includes a first insulating adhesive layer, a second insulating adhesive layer, and a third insulating adhesive layer sequentially stacked in a first direction, the first insulating adhesive layer is connected to the tab, and the third insulating adhesive layer is connected to the packaging pouch.
An electrode assembly includes a positive electrode plate. The positive electrode plate features a single-sided groove embedded tab structure. The positive electrode plate includes a positive electrode current collector and a second positive electrode active material layer disposed on a second surface of the positive electrode current collector. The second positive electrode active material layer includes a second positive electrode active material, where the second positive electrode active material includes element M, and the element M includes at least one of manganese, iron, lanthanum, zirconium, or yttrium. The positive electrode plate of this application can enhance energy density of the electrochemical apparatus based on the existing embedded tab structure. At the same time, through the element M, thermal stability of the second positive electrode active material can be improved, thereby alleviating the aging problem of the positive electrode plate caused by the single-sided groove embedded tab structure.
H01M 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 4/133 - Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 4/136 - Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
H01M 4/587 - Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 50/528 - Fixed electrical connections, i.e. not intended for disconnection
H01M 50/533 - Electrode connections inside a battery casing characterised by the shape of the leads or tabs
H01M 50/536 - Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
Provided in the present application are a secondary battery and a preparation method therefor. The outermost electrode plate of an electrode assembly is a first outer electrode plate, wherein the first outer electrode plate comprises a first current collector and a first active material layer, the first current collector having a first surface facing a first direction and a second surface facing a second direction, and the first active material layer being arranged on the second surface. The first direction is a stacking direction of electrode plates and separators of the electrode assembly, and the second direction is opposite to the first direction. The secondary battery further comprises a plurality of first adhesive layers, part of each first adhesive layer being bonded between the first surface and an inner wall of an accommodating portion, and the other part of the first adhesive layer being bonded to the first surface and at least part of a separator. By means of providing the first adhesive layers, the shrinkage of the separators can be reduced, and drop resistance of the secondary battery can be improved.
H01M 10/0585 - Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
70.
ELECTRODE ASSEMBLY, ELECTROCHEMICAL APPARATUS AND ELECTRIC DEVICE
Provided in the present application are an electrode assembly, an electrochemical apparatus and an electric device. The electrode assembly comprises a first electrode sheet and a second electrode sheet having opposite polarities, wherein a first active material layer and a second active material layer of the first electrode sheet are respectively arranged on a first surface and a second surface of a first current collector that are opposite each other; the first active material layer is provided with a first groove and a second groove penetrating through a bottom wall of the first groove to the first surface; a first surface of a first single-sided bare foil area of the first current collector is exposed in the second groove, and a second surface thereof is covered by the second active material layer, such that the volume of the second active material layer is larger; a first tab is accommodated in the second groove and is welded to the first single-sided bare foil area to form a welded joint; and a first insulating adhesive layer is accommodated in the first groove and covers the welded joint, and the projection of the first insulating adhesive layer in the direction of thickness of the first current collector is located in the first groove, such that the overall thickness of the electrode assembly is smaller, making the energy density of the electrochemical apparatus higher.
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
A secondary battery includes a packaging bag, an electrode assembly, a tab, a tab adhesive, and an adhesive member. The electrode assembly includes a first surface, and the tab protrudes from the electrode assembly through the first surface. The tab extends in direction Y, a thickness direction of the tab is direction Z, and a direction perpendicular to the directions Y and Z is direction X. A thickness of the tab is H1 μm, where 80≤H1≤100. The tab is covered with the tab adhesive, the tab adhesive is adhered to the packaging bag, and a DSC curve of the tab adhesive has an endothermic peak at a temperature T° C., where 135≤T≤165. The tab includes a positive electrode tab and a negative electrode tab, and the adhesive member is disposed between the positive and negative electrode tabs in the direction X.
An electrochemical device including a positive electrode, a negative electrode, and an electrolytic solution. The negative electrode includes a negative current collector and a negative active material layer formed on the negative current collector. The negative active material layer contains a negative active material. A conductive material is disposed between the negative active material layer and the negative current collector. An average particle diameter of the conductive material is smaller than that of the negative active material. The negative active material layer possesses a specific weight. The electrochemical device improves high-temperature cycle expansion performance and overcharge protection
A positive electrode sheet, a secondary battery, and an electronic device. The positive electrode sheet comprises a positive electrode film, the positive electrode film comprising: a positive electrode active material, a conductive agent, a binder and a dispersing additive, wherein the dispersing additive comprises at least one of an aluminate coupling agent and a titanate coupling agent, and the surface coverage a% of the positive electrode active material satisfies: 50≤a≤75. In the positive electrode sheet, by adding the dispersing additive to the positive electrode film, the conductive agent and the binder can be better dispersed on the surface of the positive electrode active material, thereby improving the surface coverage of the positive electrode active material, and reducing active sites on the surface of the positive electrode active material to reduce the decomposition of an electrolyte solution and side reactions and thus to improve the cycle performance of a secondary battery. Moreover, by controlling the surface coverage of the positive electrode active material within a suitable range, the deterioration of the dynamic performance of the secondary battery can be reduced.
A secondary battery and an electronic apparatus. The secondary battery comprises a casing, an electrode assembly and an electrolyte accommodated in the casing, a metal plate connected to the electrode assembly, and an adhesive member. The electrode assembly comprises a first electrode sheet and a second electrode sheet which are stacked, the first electrode sheet comprises a first electrode sheet layer, and the second electrode sheet comprises a second electrode sheet layer arranged adjacent to the first electrode sheet layer. The electrode assembly comprises a first end and a second end which are opposite one another. The adhesive member is adhered to the electrode assembly and the casing. The adhesive member comprises a first edge located on one side of the first end and a second edge located on one side of the second end. The distance between the first end and the first edge is L1 mm, the distance between the second end and the second edge is L2 mm, and L1>L2. The electrode assembly comprises a first area and a second area which are sequentially connected in a first direction, the adhesive member is disposed in the second area, and the distance between the first electrode sheet layer and the second electrode sheet layer located in the first area is greater than the distance between the first electrode sheet layer and the second electrode sheet layer located in the second area.
A battery cell and an electric device. The battery cell comprises an electrode assembly, a tab and a tab lead. The tab comprises a plurality of tab units. One end of the plurality of tab units is arranged at intervals in a first direction and is connected to the side of the electrode assembly in a second direction. The other ends of the plurality of tab units converge and form a root portion, a first connecting portion, a first extending portion, a second connecting portion and a second extending portion, which are sequentially connected to each other. The root portion, the first extending portion and the second extending portion are sequentially arranged at intervals on one side of the electrode assembly in the second direction, and the first connecting portion and the second connecting portion are respectively bent. The plurality of tab units are connected to each other and are provided with a first weld mark, one end of the first weld mark being located at the root portion, and the other end of the first weld mark extending to the first extending portion through the first connecting portion. The second direction is perpendicular to the first direction. Part of the tab lead and the second extending portion overlap in the second direction, and the overlapping region between the tab lead and the second extending portion is provided with a second weld mark. The battery cell is beneficial for improving the energy density.
A secondary battery includes a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte includes a compound A represented by formula:
A secondary battery includes a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte includes a compound A represented by formula:
A secondary battery includes a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte includes a compound A represented by formula:
R1 to R6 are each independently selected from a fluorine atom, a cyano group, a sulfo group, an aldehyde group, a substituted or unsubstituted C1-C6 alkoxy group, a substituted or unsubstituted C1-C6 alkyl group, a substituted or unsubstituted C2-C6 alkenyl group, a substituted or unsubstituted C2-C6 alkynyl group, a substituted or unsubstituted C6-C12 aryl group, and a substituted or unsubstituted C6-C12 aryloxy group. During substitution, substituents of the groups are each independently selected from a fluorine atom, a C1-C3 alkyl group, or a C2-C4 alkenyl group. The separator includes a base film and a porous coating, and a contact angle between the electrolyte and the surface of the porous coating of the separator is 0° to 36°.
A secondary battery includes a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte includes a compound A represented by formula:
R1 to R6 are each independently selected from a fluorine atom, a cyano group, a sulfo group, an aldehyde group, a substituted or unsubstituted C1-C6 alkoxy group, a substituted or unsubstituted C1-C6 alkyl group, a substituted or unsubstituted C2-C6 alkenyl group, a substituted or unsubstituted C2-C6 alkynyl group, a substituted or unsubstituted C6-C12 aryl group, and a substituted or unsubstituted C6-C12 aryloxy group. During substitution, substituents of the groups are each independently selected from a fluorine atom, a C1-C3 alkyl group, or a C2-C4 alkenyl group. The separator includes a base film and a porous coating, and a contact angle between the electrolyte and the surface of the porous coating of the separator is 0° to 36°.
H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
H01M 50/489 - Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
The present application provides an electrochemical device and an electronic device. The electrochemical device comprises an electrode assembly and an electrolyte. The electrode assembly is of a winding structure and comprises curved parts and a straight part, wherein the maximum length of the straight part is L mm, the maximum radius of each curved part is D mm, and 5≤L/D≤10. The electrolyte contains a compound represented by a formula (I), wherein, on the basis of the mass of the electrolyte, the content percentage by mass of the compound represented by the formula (I) is A%, and 30≤A≤80. By means of combining the regulation and control of L/D of the electrode assembly with the the regulation and control of components of the electrolyte, the present application improves the high-temperature cycle performance of the electrochemical device.
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
H01M 10/0567 - Liquid materials characterised by the additives
A secondary battery and an electronic apparatus. The secondary battery comprises a positive electrode sheet, a negative electrode sheet and a separator, the separator comprising a base film and a coating provided on at least one surface of the base film. The coating comprises a coating material, the coating can melt and flow when the temperature is greater than or equal to 90°C, the coating weight of a single-sided coating is CW g/m2, the density of the coating material is ρ g/cm3, the porosity of the base film is P%, the thickness of the base film is H μm, and 50%≤CW/(ρ×P×H)×100%≤120%, wherein 0.9≤ρ≤1.05, 20≤P≤50, and 3≤H≤10. The separator in the secondary battery can improve the thermal safety performance of the secondary battery.
H01M 50/489 - Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
79.
ELECTRODE ASSEMBLY, SECONDARY BATTERY AND ELECTRONIC DEVICE
An electrode assembly (10), a secondary battery (100) and an electronic device. Several extension members (1111) are provided at an end of a first current collector (111) in the direction of width, several protruding portions (1112) are provided on and protrude from a first surface (111a) of each extension member, and several recessed portions (1113) are recessed in a second surface (111b) of each extension member. The electrode assembly (10) comprises adjacent extension members (1111). When observed in the direction of thickness of the electrode assembly (10), two adjacent extension members (1111) at least partially overlap, and at least one protruding portion (1112) of each extension member (1111) is embedded in the recessed portion (1113) of the extension member (1111) adjacent thereto, such that the strength of the extension members (1111) can be improved and the bending deformation and damage to the extension members (1111) can be reduced, thereby facilitating electrical connection of the extension members (1111), and improving the stability of the electrical connection.
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 50/531 - Electrode connections inside a battery casing
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
A battery cell and a battery. The battery cell (10) comprises a battery cell main body; the battery cell main body comprises a main body part (100) and a plurality of tab structures (200); each tab structure (200) comprises a plurality of tabs (210) arranged on the same side of the main body part (100) in a first direction of the battery cell (10), each tab (210) being connected to the main body part (100); in each tab structure (200), some of the tabs (210) form a first tab group (201), while the other tabs (210) form a second tab group (202), and the first tab group (201) and the second tab group (202) are bent towards each other respectively at a first bending area (210a) and a second bending area (210b), and are stacked and connected to each other, the first bending area (210a) and the second bending area (210b) being spaced apart from each other in a second direction perpendicular to the first direction. Lower bending stresses are put on all of the first tab groups (201) and the second tab groups (202), such that the tab structures (200) occupy small spaces, helping to improve the energy density of batteries. The first tab groups (201) and the second tab groups (202) are more stable, effectively reducing the occurrence of abnormal situations, such as damage and breakage, of tabs (210) at joints of the first tab groups (201) and the second tab groups (202).
A secondary battery (1) and an electric device (2). The secondary battery (1) comprises a secondary battery body (10) and a first connector (21). The secondary battery body (10) is provided with a main body portion (111) and a first side sealing edge (112), wherein the main body portion (111) comprises a first main wall (1111), a second main wall (1112) and a first side wall (1113); in a first direction, the first main wall (1111) is arranged opposite the second main wall (1112), the first side wall (1113) is connected between the first main wall (1111) and the second main wall (1112), and the first side sealing edge (112) extends out of the first side wall (1113) and is fixed to the first side wall (1113) in a manner of turning and folding. The first connector (21) comprises a first fixing portion (211) and a first connecting portion (212) connected to the first fixing portion (211), wherein the first fixing portion (211) is fixed to the first side sealing edge (112), the first connecting portion (212) is beyond one end of the first side sealing edge (112) in a second direction, and the first connecting portion (212) is configured to be detachably connected to the electric device (2), so as to fix the secondary battery (1) in a battery compartment of the electric device (2). In this way, the secondary battery body (10) can be detachably connected to the electric device (2) by means of the first connector (21), so as to facilitate subsequent disassembly and replacement of the secondary battery (1).
H01M 50/244 - Secondary casingsRacksSuspension devicesCarrying devicesHolders characterised by their mounting method
H01M 50/264 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
H01M 50/247 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
82.
SECONDARY BATTERY AND ELECTRIC DEVICE INCLUDING SUCH SECONDARY BATTERY
An electrolyte solution includes an organic solvent, and the organic solvent includes ethyl propionate and propyl propionate. Based on a mass of the electrolyte solution, a mass percentage of the ethyl propionate is m %, and a mass percentage of the propyl propionate is n %, a difference n−m between n and m being 5 to 54. The negative electrode active material includes graphite, a ratio n/Lc of n to a crystal size value Lc of the graphite being 1 to 2.14. The amount difference between the ethyl propionate and the propyl propionate in the electrolyte solution is set to satisfy specific requirements, and the ratio n/Lc of the mass percentage n % of the propyl propionate to the crystal size value Lc of the graphite is 1 to 2.14, reducing the high-temperature internal resistance of the secondary battery, and improving the high-voltage cycling performance.
An electrochemical device includes: a positive electrode, a negative electrode, an electrolyte, and a separator, where the positive electrode includes a positive current collector and a first positive active material layer and a second positive active material layer located on the positive current collector, the first positive active material layer is located between the positive current collector and the second positive active material layer, the first positive active material layer contains an element Mn and has a thickness of h1 μm, the second positive active material layer has a thickness of h2 μm, and h1>h2.
H01M 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/136 - Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
H01M 4/485 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0567 - Liquid materials characterised by the additives
H01M 10/0568 - Liquid materials characterised by the solutes
H01M 10/0569 - Liquid materials characterised by the solvents
84.
NEGATIVE ELECTRODE PLATE, SECONDARY BATTERY, AND ELECTRONIC APPARATUS
A negative electrode plate includes a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material. The negative electrode active material includes negative electrode active material particles, the negative electrode active material particles including a first particle having a pore. In a 200 μm×200 μm region of a cross section of the negative electrode active material layer along the thickness direction of the negative electrode active material layer, the negative electrode active material satisfies 0.10≤TD−0.05×(1/X)≤0.40, where X represents a ratio of an average cross-sectional area of the pore in the first particle to an average cross-sectional area of the first particle, and 4.0%≤X≤15%, and TD represents a value of a tap density of the negative electrode active material expressed in g/cm3.
A negative electrode plate includes a negative electrode active material, and the negative electrode active material includes first particles with pores and second particles other than the first particles, where within a 200 μm×200 μm region of a cross-section of the negative electrode active material layer, the first particles satisfy: 0.10≤a/b≤0.85 and 0.89≤0.98×C−(a/b)2≤1.86, where a μm represents an average maximum Feret diameter of the pores in the first particles; b μm represents an average maximum Feret diameter of the first particles; and C g/cm3 represents a compacted density of the negative electrode active material, where 1.65≤C≤1.95. The negative electrode plate provided in this application has both a high compacted density and a high porosity.
An electrochemical apparatus includes a housing and a sealing nail. A wall of the housing is provided with a through hole that runs through the wall of the housing. The sealing nail is disposed on the housing, the sealing nail masks and seals the through hole, the sealing nail includes a weak area and a non-weak area, a thickness of the weak area is less than the thickness of the non-weak area of the sealing nail, the weak area includes a starting end and a tail end, and the starting end and the tail end are separated. A thickness of the housing is H1, and the thickness of the sealing nail is H2, where 0.1≤H2/H1≤0.7
An electrochemical device includes a negative electrode, the negative electrode including a negative current collector and a negative active material layer disposed on the negative current collector. The negative active material layer includes a negative active material. The negative active material includes a carbon-based material, silicon, and sulfur. Based on a total mass of the negative active material layer, a mass percentage of the silicon is a %, and a mass percentage of the sulfur is b %, 0.1≤a/b<1, and 0.03≤b≤0.55.
The present application provides a coating composition, an electrode sheet and a preparation method therefor, a secondary battery and an electronic device. The coating composition comprises a first binder and a pore-forming agent, the pore-forming agent has a core-shell structure, and the core-shell structure comprises a shell layer material and a core material, wherein the shell layer material comprises a second binder, and the core material comprises an alkane gas. The coating composition can be used for forming a pore-forming coating in an electrode sheet. The pore-forming coating can be disposed between a current collector and an active material layer. For the pore-forming agent having a core-shell structure in the pore-forming coating, under suitable conditions, the release of alkane gas in the pore-forming agent more easily results in the formation of through-holes in an active material layer as compared to a general pore-forming agent producing a gas by means of decomposition, thereby providing channels for electrolyte infiltration into the active material layer and promoting the infiltration of the electrolyte into the active material layer, which can increase the ionic conductivity of the electrode sheet, reduce polarization in the process of charge/discharge, and improve the rate capability of a battery cell.
An electrochemical apparatus and an electronic apparatus. The electrochemical device comprises a positive electrode sheet, a negative electrode sheet and a separator; the negative electrode sheet comprises a negative electrode current collector, a surface of the negative electrode current collector being provided with a first negative electrode active material layer containing a silicon-based material; the separator is disposed between the negative electrode sheet and the positive electrode sheet, a polymer particle layer being disposed on a surface of the separator adjacent to the first negative electrode active material layer. By means of matching separators coated with polymer particle layers of different thicknesses based on differences in silicon content of the negative electrode active material layer coated on the surface of the negative electrode current collector in the negative electrode sheet, it is possible to reserve corner space to buffer electrode sheet extrusion and fracture, overcome the problems of electrode sheet fracture and cycle lithium deposition caused by silicon-based expansion, and maximize energy density.
An electrochemical apparatus, including an electrode assembly. The electrode assembly includes a negative electrode plate and a positive electrode plate. The negative electrode plate includes a first negative electrode active material layer, a negative electrode current collector, a second negative electrode active material layer, and a first layer. The positive electrode plate includes a first positive electrode active material layer, a positive electrode current collector, and a second positive electrode active material layer. The negative electrode plate includes a first negative electrode winding layer and a second negative electrode winding layer. A negative electrode single-coated region of the negative electrode current collector is located on at least the first negative electrode winding layer and the second negative electrode winding layer. A positive electrode double-coated region of the positive electrode current collector is located on a side of the second negative electrode winding layer away from a winding central axis.
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 4/13 - Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulatorsProcesses of manufacture thereof
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
A secondary battery and an electronic device. The secondary battery comprises a positive electrode sheet, a negative electrode sheet, and an electrolyte; the positive electrode sheet comprises a positive electrode material layer, the positive electrode material layer comprises a positive electrode active material, and the positive electrode active material comprises a cobalt element and a magnesium element; based on the mass of the positive electrode material layer, the mass percentage content of the magnesium element is A%, wherein 0.1≤A≤5; the electrolyte comprises a fluorinated solvent, and the fluorinated solvent comprises at least one of a compound represented by formula (I), a compound represented by formula (II), a compound represented by formula (III), or a compound represented by formula (IV); based on the mass of the electrolyte, the mass percentage content of the fluorinated solvent is B%, wherein 41.7≤B≤83.2 and 0.1≤100A/B≤6. The secondary battery provided has good high-temperature storage performance and high-temperature cycle performance.
The present application discloses an electrochemical apparatus and an electric device. The electrochemical apparatus comprises an electrode assembly and a housing; the housing has a first side wall and a second side wall which are oppositely arranged in a first direction; the first direction is the thickness direction of the electrode assembly; the electrode assembly is arranged between the first side wall and the second side wall; the first side wall has a first outer surface and a first inner surface; the first outer surface is distant from the electrode assembly relative to the first inner surface; the first outer surface is provided with a first protrusion; the first inner surface is provided with a first recess at a position opposite to the first protrusion; the orthographic projection of the first protrusion on a first plane is located in a first angular region of the orthographic projection of the first side wall on the first plane; and the first plane is perpendicular to the first direction. According to the electrochemical apparatus of the present application, by providing the protrusion in the angular region of the first side wall, the stress borne by corners of the housing can be reduced when the electrode assembly expands, thereby reducing the risk of damage to the corners, and improving the reliability of the electrochemical apparatus during use.
An electrochemical apparatus includes a positive electrode plate, where the positive electrode plate includes a positive electrode material layer, the positive electrode material layer includes a positive electrode active material, elements in the positive electrode active material include Li, Mn, Ni, Co, and Fe, and the positive electrode active material satisfies at least one of the following characteristics: (i) a ratio A of the number of Mn atoms to a total number of Ni, Co, and Fe atoms being 3.5 to 40; and (ii) a ratio B of the number of Li atoms to a total number of Mn, Ni, Co, and Fe atoms being 0.51 to 0.79. The elements in the positive electrode active material are controlled to satisfy the range of A and/or B.
H01M 4/131 - Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 10/0567 - Liquid materials characterised by the additives
An secondary battery includes a current interrupt device. A trigger pressure of the current interrupt device is a kPa, 1≤a≤4. The secondary battery contains an electrolyte solution. The electrolyte solution includes a chain ester. A saturation vapor pressure of the chain ester at 25° C. ranges from 4 kPa to 100 kPa. Based on a mass of the electrolyte solution, a mass percent of the chain ester is b %, 35≤b≤80.
A housing includes an electrode post assembly and a first housing in which an accommodation cavity is formed. A mounting hole is created on the first housing. The electrode post assembly includes a rivet, a first gasket, a second gasket, and a pressing piece. The rivet includes a first end portion, a shaft portion, and a second end portion connected in sequence. The shaft portion passes through the mounting hole. The first gasket surround the shaft portion, and is disposed between the first end portion and the first housing. The second gasket surround the shaft portion, and is disposed between the second end portion and the first housing. The pressing piece is disposed around the shaft portion, and disposed between the first end portion and the first gasket.
An electrochemical apparatus and an electrical device. The electrochemical apparatus comprises a housing, an electrode assembly and a bonding assembly. The housing comprises a first side wall, and the electrode assembly is arranged in the housing and comprises a first side surface adjacent to the first side wall, the first side surface comprising a second area, a first area and a third area which are successively arranged in a first direction. The bonding assembly is located between the housing and the electrode assembly, and comprises a first surface and a second surface which are opposite to each other; the first surface comprises a first bonding region bonded to the first side wall; the second surface comprises a second bonding region bonded to the second area, a third bonding region bonded to the third area, and a first non-bonding region located between the second bonding region and the third bonding region. In a second direction, the projection of the first bonding region overlaps with the first non-bonding region, the second direction being the direction in which the first side wall is opposite to the first side surface. Eliminating bonding between the bonding assembly and the first area helps to reduce the risk of damage to the electrode assembly.
An electrochemical apparatus (100) and an electrical device. The electrochemical apparatus (100) comprises an electrode assembly (20) and a casing. The casing comprises a first bottom wall (103) and a second bottom wall (104) which are arranged opposite to each other in a first direction (X), a first side wall (101) and a second side wall (102) which are arranged opposite to each other in a second direction (Y), and a third side wall (105) and a fourth side wall (106) which are arranged opposite to each other in a third direction (Z), the first direction (X) being the thickness direction of the electrode assembly (20). The first side wall (101), the second side wall (102), the third side wall (105), the fourth side wall (106), the first bottom wall (103) and the second bottom wall (104) define an accommodating space (1001), the electrode assembly (20) being accommodated in the accommodating space (1001). The first side wall (101) comprises a first base part (1011) and a first protruding part (1012); the first protruding part (1012) is connected to the first base part (1011) and the third side wall (105); the outer surface (10121) of the first protruding part (1012) protrudes in the second direction from the outer surface (10111) of the first base part (1011); the inner surface (10122) of the first protruding part (1012) is recessed relative to the inner surface (10112) of the first base part (1011) in a direction away from the electrode assembly (20). The electrochemical apparatus (100) reduces the risk of the electrode assembly (20) pressing corner parts of the casing, such that the usage reliability of the electrochemical apparatus is improved.
H01M 50/103 - Primary casingsJackets or wrappings characterised by their shape or physical structure prismatic or rectangular
H01M 50/131 - Primary casingsJackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
H01M 50/14 - Primary casingsJackets or wrappings for protecting against damage caused by external factors
H01M 10/0587 - Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
98.
SEALING MEMBER, BATTERY MODULE AND ELECTRICAL DEVICE
A sealing member, a battery module (100) and an electrical device (200). The battery module (100) comprises a housing (10), a battery cell (20), a first sealing member (30), and a second sealing member (40). The housing (10) is provided with a first through hole (10a), a second through hole (10b) and an accommodation space (10c), the first through hole (10a) being communicated with the accommodation space (10c), and the second through hole (10b) being communicated with the accommodation space (10c). The battery cell (20) is arranged in the accommodation space (10c). The first sealing member (30) is connected to the housing (10) and seals the first through hole (10a). The second sealing member (40) is connected to the housing (10) and seals the second through hole (10b). The first sealing member (30) is configured to melt and/or lose adhesiveness when the internal temperature of the battery module (100) reaches a first temperature, so as to form a first pressure relief channel, and the second sealing member (40) is configured to melt and/or lose adhesiveness when the internal temperature of the battery module (100) reaches a second temperature, so as to form a second pressure relief channel, the second temperature being higher than the first temperature. The second temperature of the second sealing member (40) being higher than the first temperature of the first sealing member (30) facilitates pressure relief and reduces the risk of short circuit between the battery cell (20) and the housing (10), thus improving the safety and pressure relief reliability of the battery module (100).
A casing (20), a cell (100), and an electric device. The casing (20) comprises a housing (21) and a pressure relief assembly (23); the housing (21) is provided with a pressure relief hole (211); the pressure relief assembly (23) blocks the pressure relief hole (211); the pressure relief assembly (23) comprises a bonding layer (231); the bonding layer (231) is bonded to the housing (21); and the bonding layer (231) is configured to lose adhesiveness when the temperature inside the housing (21) reaches a threshold temperature, thereby opening the pressure relief hole to relieve pressure inside the housing (21). The bonding area of the bonding layer (231) is S, wherein 2mm2≤S≤10mm2. By opening the pressure relief hole (211) when the bonding layer (231) of the pressure relief assembly (23) lose adhesiveness when receiving heat, the pressure relief assembly (23) has good thermal sensitivity and high pressure relief reliability, so that the safety of the cell having the casing (20) can be improved, there is no need to reserve a large space for the pressure relief assembly (23), and the space of the electric device is fully utilized. Since 2mm2≤S≤10mm2, when the casing (20) is in a normal working state, the bonding layer (231) can ensure that the pressure relief assembly (23) effectively blocks the pressure relief hole (211), and can also lose adhesiveness in time when the pressure and temperature inside the casing (20) are abnormal, thereby relieving pressure in time.
H01M 50/503 - Interconnectors for connecting terminals of adjacent batteriesInterconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
H01M 50/186 - Sealing members characterised by the disposition of the sealing members
H01M 50/375 - Vent means sensitive to or responsive to temperature
H01M 10/653 - Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
A battery cell casing, a pressure relief mechanism (2) of a battery cell, a battery cell (10), and an electrical apparatus. The battery cell casing comprises a casing body (1) and a pressure relief mechanism (2); a through hole (20) is formed in the casing body (1); the pressure relief mechanism (2) is arranged in the through hole (20); the pressure relief mechanism (2) comprises an adhesive film (21) and a cover piece (22); the cover piece (22) is bonded to the casing body (1) by means of the adhesive film (21) and covers the through hole (20); the adhesive film (21) can be heated and melted to form a pressure relief channel communicating the interior and the exterior of the casing body (1); the bonding area of the cover piece (22) and the casing body (1) is A, and the cross-sectional area of the through hole (20) covered by the cover piece (22) is B, wherein 1.778≤A/B≤16.361. According to the structure, the range of the ratio of the bonding area A of the cover piece (22) and the casing body (1) to the cross-sectional area B of the pressure relief channel covered by the cover piece (22) is limited, so that when the internal pressure of the battery cell (10) reaches a preset value, the cover piece (22) can fall off in time to form a pressure relief channel, and the internal pressure of the battery cell (10) is reduced in time, and thus, the battery cell (10) can has good reliability while achieving overheating pressure relief.
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