Provided is a method of manufacturing a solid electrolytic capacitor, including the steps of: forming a capacitor element including an anode body having a dielectric coating film on a surface thereof; impregnating the capacitor element with a polymerization liquid containing a precursor monomer of a conductive polymer and an oxidant; impregnating the capacitor element impregnated with the polymerization liquid with a silane compound or a silane compound containing solution; and forming a conductive polymer layer by polymerizing the precursor monomer after impregnating the capacitor element with the silane compound or the silane compound containing solution.
H01G 9/00 - Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devicesProcesses of their manufacture
2.
JIG FOR MEASURING ELECTRICAL CHARACTERISTICS OF ELECTROLYTIC CAPACITOR, MEASURING APPARATUS PROVIDED WITH JIG FOR MEASURING ELECTRICAL CHARACTERISTICS OF ELECTROLYTIC CAPACITOR, AND MEASUREMENT METHOD FOR ELECTROLYTIC CAPACITOR
[Problem] To provide a measuring jig, a measuring apparatus and a measurement method, each of which is capable of measuring ESR or ESL of an electrolytic capacitor with stable accuracy. [Solution] A jig (1) for measuring electrical characteristics of an electrolytic capacitor (15), which is used so as to immobilize the electrolytic capacitor (15) when the electrical characteristics of the electrolytic capacitor (15) are measured, said electrolytic capacitor (15) being configured so that a positive electrode lead terminal (4) and/or a negative electrode lead terminal (5) has a plurality of terminal parts. The jig (1) comprises: a plurality of electrode plates (2) for a positive electrode, which are in contact with the positive electrode lead terminal (4) and support the positive electrode lead terminal (4); and plurality of electrode plates (3) for a negative electrode, which are in contact with the negative electrode lead terminal (5) and support the negative electrode lead terminal (5). The number of the electrode plates (2) and/or the electrode plates (3) is 3 or more.
H01G 13/00 - Apparatus specially adapted for manufacturing capacitorsProcesses specially adapted for manufacturing capacitors not provided for in groups
3.
Solid electrolytic capacitor and method of manufacturing thereof
A solid electrolytic capacitor with suppressed occurrence of short circuit is provided. The solid electrolytic capacitor includes an anode body having a surface on which a dielectric film is formed, and a conductive polymer layer formed on the dielectric film. The conductive polymer layer includes at least a first conductive polymer layer formed on the dielectric film and a second conductive polymer layer formed on the first conductive polymer layer. A silane compound in the first conductive polymer layer and the silane compound in the second conductive polymer layer have respective concentrations different from each other.
[Problem] To provide a high-performance solid electrolyte capacitor. [Solution] This solid electrolyte capacitor comprises a positive electrode having a dielectric film on a surface thereof; a negative electrode; and a solid electrolyte disposed between the positive electrode and the negative electrode. The solid electrolyte is a conductive polymer comprising first repeating units (A) represented by formula (1) below and second repeating units (B) represented by formula (2) below (where L is an optionally substituted C2 or C3 alkylene group or silyl group, and Rx and Ry are each different optionally substituted linear or branched alkyl groups wherein x and y are between 1 and 14).
[Problem] To provide a high-performance solid electrolytic capacitor. [Solution] A solid electrolytic capacitor provided with a positive electrode body comprising tantalum or niobium, an dielectric film provided on the positive electrode body, and a solid electrolyte layer provided on the dielectric film. The dielectric film contains both a first dielectric film formed on the surface of the positive electrode body and comprising a tantalum or niobium oxide, and also a second dielectric film formed on said first dielectric film and comprising a composite metal oxide of a perovskite structure.
[Problem] To increase the capacitance and reduce the size of a coiled type electrolytic capacitor. [Solution] An electrolytic capacitor according to the present invention comprises a coiled body (11) formed by coiling electrode foil (111, 112). An electrically insulating fibre sheet (113) is adhered to both faces of the electrode foil (112) such that the fibre sheet (113) is integrated with the electrode foil (112). To be specific, with regard to the electrode foil (112) with which the fibre sheet (113) has been integrated, the fibre sheet (113) is adhesively fixed onto both of the faces of the electrode foil (112). Fibre layers constituting the fibre sheet (113) may also be formed on both of the faces of the electrode foil (112) by adhering fibres to both of these faces.
[Problem] To eliminate, in a solid-state electrolytic capacitor, design changes in a land pattern which is formed on a substrate on which the solid-state electrolytic capacitor is mounted, while achieving increased capacity on the part of the solid-state electrolytic capacitor without increasing the complexity of the manufacturing process thereof. [Solution] An electrolytic capacitor according to the present invention comprises a wound body (11), a solid-state electrolyte layer, an anode lead tab element (30), and a cathode lead tab element (40). The wound body (11) is configured by winding an anode member (111), in which a dielectric film is formed on the obverse face thereof, together with a separator (112) and apart from a cathode member. The solid-state electrolyte layer is formed in the interior of the wound body (11). The anode lead tab element (30) is attached to the anode member (111) and is electrically connected to the anode member (111). The cathode lead tab element (40) is attached to the separator (112) and is electrically connected to the solid-state electrolyte layer.
[Problem] To achieve a large capacitance, low ESR, and improved yield of a solid electrolytic capacitor, while simplifying the manufacture steps of the solid electrolytic capacitor. [Solution] In a method for manufacturing a solid electrolytic capacitor of the present invention, first, an anode foil (111) is manufactured by cutting a metal foil having a dielectric film formed on the surface thereof. Then, within the end surface of the anode foil (111), at least on an end surface region (111a) positioned in the width direction (91) of the anode foil (111), an electrically insulating resin film (7) that covers the end surface region (111a) is formed. Then, after forming the resin film (7), a winding body (11) is manufactured by attaching an anode lead tab terminal (30) to the anode foil (111), then, winding the anode foil (111) with a conductive separator (112) overlapped thereon, without having a cathode foil overlapped thereon. Then, a solid electrolytic layer is formed on the winding body (11), then, outside of the winding body (11), a cathode layer is formed on the solid electrolytic layer, and a cathode lead frame is electrically connected to the cathode layer.
[Problem] To provide a solid electrolytic capacitor having a large capacity and small ESR, and in which the electrostatic capacity is not reduced by chemical conversion treatment carried out in manufacturing processes. [Solution] This solid electrolytic capacitor comprises: a winding member (11) such that a plurality of positive electrode foils (111, 111), in which a dielectric coating is formed on the surfaces and end surfaces, are wound with conductive separators (112) therebetween; a solid electrolyte layer formed inside the winding member (11); a plurality of positive electrode leads connected to the plurality of positive electrode foils (111, 111) and led out from the winding edge (11a)of the winding member (11); and a negative electrode lead electrically connected to the separators (112).
At least any of a second cathode lead terminal and a second anode lead terminal has such a construction that a lead portion is shifted with respect to a connection portion orthogonally. A first cathode lead terminal is closer to one end of a cathode foil than the second cathode lead terminal and a first anode lead terminal is closer to one end of an anode foil than the second anode lead terminal. A core has first and second lengths along first and second straight lines passing through a core axis, respectively. The first length is smaller than the second length. The cathode and anode foils are wound together around the core from the one end of each of the cathode and anode foils. The second straight line lies between the first cathode and anode lead terminals and the first straight line lies between the second cathode and anode lead terminals.
A first cathode lead terminal is arranged closer to one end of a cathode foil than a second cathode lead terminal, and a first anode lead terminal is arranged closer to one end of an anode foil than a second anode lead terminal. In a cross-section perpendicular to an axis, a core has a first length along a first straight line passing through the axis and a second length along a second straight line passing through the axis and orthogonal to the first straight line, and the first length is smaller than the second length. When the cathode and the anode foils are together wound around the core from each one end, the first straight line lies between the first cathode lead terminal and the first anode lead terminal and the second straight line lies between the second cathode lead terminal and the second anode lead terminal.
A one-side pressed terminal is applied as a first anode (cathode) lead tab terminal and the one-side pressed terminal is connected to an anode (a cathode) foil in such a manner that a position in a radial direction of a lead is shifted inward after winding. A one-side pressed terminal is applied as a second anode (cathode) lead tab terminal and the one-side pressed terminal is connected to the anode (cathode) foil in such a manner that a position in the radial direction of a lead is shifted inward after winding. Thus, while retaining characteristics as an electrolytic capacitor, connection of the anode (cathode) lead tab terminal to the anode (cathode) foil can be achieved in a stable manner.
An electrolytic capacitor is manufactured which includes at least one capacitor element having an anode portion, a dielectric film covering a part of the anode portion and a cathode portion located on the dielectric film; and a piece member attached to each anode portion. The dielectric film is formed on each of a plurality of anode portions including the anode portion. A connecting portion connecting the plurality of anode portions to each other is provided. After the step of providing the connecting portion, the cathode portion is formed on the dielectric film in order to form a plurality of capacitor elements including at least one capacitor element. After the step of forming the cathode portion, the piece member is cut out from the connecting portion in order to separate the plurality of capacitor elements from each other.
A solid electrolytic capacitor having a high heat resistance is provided. The solid electrolytic capacitor according to the present invention includes an anode body having a surface on which a dielectric film is formed, and a conductive polymer layer formed on the dielectric film. The conductive polymer layer includes an aromatic sulfonic acid ion and an NHPA compound ion.
Electrode lead terminals in a number not less than three are attached to a cathode foil and an anode foil. The electrode lead terminals include at least one cathode lead terminal attached to the cathode foil and at least one anode lead terminal attached to the anode foil. A winding core having an axis is prepared. The cathode foil and the anode foil are wound around the winding core, being overlapped each other. A cross section of the winding core perpendicular to the axis includes an outer edge having a portion along each side of a polygon with the above number of sides. Thereby, a method for manufacturing an electrolytic capacitor capable of suppressing displacement of a lead terminal can be provided.
A both-side pressed terminal is connected as a first anode (cathode) lead tab terminal to an anode (a cathode) foil. A first connection surface of a connection portion of a one-side pressed terminal as a second anode (cathode) lead tab terminal is connected to an inner circumferential surface of the anode (cathode) foil. A position in a radial direction of a lead of the second anode (cathode) lead tab terminal is shifted inward to be in registration with a position in a radial direction of a lead of the first anode (cathode) lead tab terminal. Thus, an electrolytic capacitor free from position displacement of an anode (a cathode) lead tab terminal while maintaining characteristics as an electrolytic capacitor can be obtained.
A solid electrolytic capacitor with suppressed occurrence of short circuit is provided. The solid electrolytic capacitor includes an anode body having a surface on which a dielectric film is formed, and a conductive polymer layer formed on the dielectric film. The conductive polymer layer includes at least a first conductive polymer layer formed on the dielectric film and a second conductive polymer layer formed on the first conductive polymer layer. A silane compound in the first conductive polymer layer and the silane compound in the second conductive polymer layer have respective concentrations different from each other.
As to each of a capacitor element employing an anode foil having a matrix made of a metal and a film, provided on the surface of the matrix, made of an oxide of a metal different from the metal of the matrix and a capacitor element employing an anode foil having a matrix made of a prescribed metal and a film of an oxide of the metal and a cathode foil having a matrix made of another metal different from the metal, formation treatment is performed on an end face of the anode foil exposing the surface of the metal forming the matrix by applying a positive voltage to an anode lead wire and applying a negative voltage to a cathode lead wire. Thus, an electrolytic capacitor resistant against corrosion or the like is obtained.
A first anode foil is opposed to a first portion of a cathode foil and is arranged on one side of the cathode foil, and a second anode foil is opposed to a second portion of the cathode foil and is arranged on the other side. A first separator paper sheet is arranged between the first portion of the cathode foil and the first anode foil. A second separator paper sheet is arranged on the other side with respect to the cathode foil, and is opposed to the first portion of the cathode foil. A third separator paper sheet is arranged between the second portion of the cathode foil and the second anode foil. A fourth separator paper sheet is arranged on the one side with respect to the cathode foil, and is opposed to the second portion of the cathode foil.
Provided is a method of manufacturing a solid electrolytic capacitor, including the steps of: forming a capacitor element including an anode body having a dielectric coating film on a surface thereof; impregnating the capacitor element with a polymerization liquid containing a precursor monomer of a conductive polymer and an oxidant; impregnating the capacitor element impregnated with the polymerization liquid with a silane compound or a silane compound containing solution; and forming a conductive polymer layer by polymerizing the precursor monomer after impregnating the capacitor element with the silane compound or the silane compound containing solution.
Provided is a method of manufacturing a solid electrolytic capacitor having a solid electrolyte. The solid electrolyte having a conductive polymer is formed by an oxidative polymerization reaction, using a polymerization liquid containing a monomer and a dopant. The dopant contains alkylammonium ions as a cationic component.
The electrolytic capacitor includes two chemically processed anode foils, two cathode foils, four separator sheets, four lead tab terminals, two anode leads and two cathode leads. The two chemically processed anode foils, two cathode foils and four separator sheets are arranged alternately and rolled, to form a capacitor element. Two lead tab terminals are connected to the two chemically processed anode foils, respectively, and the remaining two lead tab terminals are connected to two cathode foils, respectively. The two anode leads are connected to two lead tab terminals, respectively, and the two cathode leads are connected to two lead tab terminals, respectively. As a result, equivalent series resistance can stably be reduced.
b), and a solid electrolyte layer, and is also configured so that the solid electrolytic capacitor further includes an intermediate layer 18 formed between the cathode (3) and the hard coating film (28), the hard coating film (28) is composed of a compound of aluminum, titanium, and at least one nonmetallic element, and the intermediate layer (18) contains at least one element selected from the group of metallic elements consisting of aluminum and titanium. It is particularly preferable that the hardness of the substance that constitutes the intermediate layer (18) of the solid electrolytic capacitor be less than the hardness of the substance that constitutes the hard coating film (28).
Disclosed are a solid electrolytic capacitor, which uses an electroconductive polymer cathode layer and possesses improved heat resistance, and a process for producing the solid electrolytic capacitor. The solid electrolytic capacitor comprises a capacitor element (1). The capacitor element (1) comprises an anode foil with a dielectric film provided thereon, a cathode foil located opposite to the anode foil, and a separator sheet interposed between the anode foil and the cathode foil, and the assembly is rolled. An electroconductive polymer cathode layer containing a fullerene compound having a C60 structure (a fullerene compound bonded to a polymer skeleton in the electroconductive polymer cathode layer and a fullerene compound dispersed in the electroconductive polymer cathode layer) is provided within the roll. The electroconductive polymer cathode layer is formed as follows. A chemical polymerizing liquid prepared by mixing a monomer solution of 3,4-ethylenedioxythiophene with a solution prepared by dissolving a ferric salt of sulfonated fullerene C60 as a dopant, which serves also as an oxidizing agent, in a butyl alcohol solvent is provided. The capacitor element (1) is immersed in the chemical polymerizing liquid followed by oxidative polymerization to form the electroconductive polymer cathode layer containing sulfonated fullerene C60 as the fullerene compound.
The invention provides a method of manufacturing a metal foil for an electrolytic capacitor. In the case of slitting a wide metal strip subjected to etching treatment into a predetermined size with a cutting blade, a slitting portion of the heated wide metal strip is slit to provide the metal foil with few burrs and cracks at the slit edge surface.
An electrolytic capacitor in which positions of an anode terminal and a cathode terminal in a wound-type capacitor element can be fixed and consequently increase in leakage current can be suppressed and a manufacturing method thereof are provided. The electrolytic capacitor including a wound-type capacitor element having an anode terminal and a cathode terminal, a bottomed case accommodating the wound-type capacitor element, and a sealing member sealing the winding structure portion in the bottomed case, through which the anode terminal and the cathode terminal penetrate, includes a fixing member arranged between the winding structure portion and the sealing member and having openings in number not smaller than the sum of the number of anode terminals and the number of cathode terminals, the anode terminal and the cathode terminal passing through the openings, and the anode terminal and the cathode terminal being fixed by the fixing member.
[PROBLEMS] To reduce height of a capacitor by eliminating a base plate while maintaining a capacity and characteristics of low ESR and the like equivalent to those of conventional capacitors. [MEANS FOR SOLVING PROBLEMS] An electrolytic capacitor is provided with a capacitor element; a bottomed case for storing the capacitor element; a sealing member for sealing the capacitor element at an open end portion of the bottomed case; and an anode lead line and a cathode lead line connected to an anode foil and a cathode foil through lead tabs. Each of the anode lead line and the cathode lead line has a terminal section, which protrudes from the sealing member and is bent to the direction of the outer frame of the bottomed case. The sealing member has at last one protruding section on a surface exposed to the external. A leading end surface of the protruding section and surfaces, which are of the terminal sections of the anode lead line and the cathode lead line and brought into contact with a mounting substrate, are arranged substantially on the same flat surface.
The present invention provides a method of manufacturing a solid electrolytic capacitor including a step of forming a conductive polymer layer by chemical oxidization polymerization of a monomer using a solution containing a metal salt of carbon-fused bicyclic sulfonic acid as an oxidizing agent. The molar ratio X of a carbon-fused bicyclic sulfonate ion to a metal ion in the solution is less than the stoichiometric ratio Y of the metal salt of carbon-fused bicyclic sulfonic acid. This is allowed to provide a solid electrolytic capacitor with a sufficiently low equivalent series resistance (ESR) and high heat resistance.
B05D 5/12 - Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
H01G 7/00 - Capacitors in which the capacitance is varied by non-mechanical meansProcesses of their manufacture
An electrolytic capacitor includes an anode lead, a cathode lead and a seat plate. The seat plate has two grooves. The anode lead is bent along one of the grooves in the seat plate to be placed in the groove. The cathode lead is bent along the other groove in the seat plate to be placed in the groove. Accordingly, a space will be formed between the anode lead and the edges of one of the grooves in the seat plate, and likewise, between the cathode lead and the edges of the other groove in the seat plate. The anode lead and the cathode lead are mounted to a substrate with solders, and the electrolytic capacitor is mounted to the substrate. Accordingly, enhanced adhesion of the electrolytic capacitor to substrates is achieved.
[PROBLEMS] To provide an electrolytic capacitor not using a separator paper. [MEANS FOR SOLVING PROBLEMS] An electrolytic capacitor (10) comprises an anode formation foil (1), a cathode foil (2), a winding stop tape (3), lead tab terminals (6, 7), an anode lead wire (8), and a cathode lead wire (9). The surfaces of the anode formation foil (1) and the cathode foil (2) are coated with a polyolefin based conductive polymer. The lead tab terminal (6) is connected to the anode formation foil (1), and the lead tab terminal (7) is connected to the cathode foil (2). The anode lead wire (8) is connected to the lead tab terminal (6), and the cathode lead wire (9) is connected to the lead tab terminal (7). The anode formation foil (1) and the cathode foil (2) to which the lead tab terminals (6, 7), the anode lead wire (8) and the cathode lead wire (9) are connected are wound without a separator paper and stopped by the winding stop tape (3), thereby manufacturing a capacitor element (5).
A solid electrolytic capacitor (1) is prepared by carbonizing a wound element (21) formed by winding an anode foil (22) and a cathode foil (23) together with a separator paper (4) sandwiched therebetween, and forming a solid electrolyte layer, including said separator (4), including a conductive polymer between the anode foil (22) and the cathode foil (23). The separator paper (4) is paper prepared by mixing fibers having low heat resistance and carbonized by said carbonizing, and fibers having high heat resistance not carbonized by said carbonizing, and fibrillated fibers having narrow spaces between fibers are used as said fibers having high heat resistance. The solid electrolytic capacitor has an excellent ESR characteristic, in which a dense solid electrolyte layer can be formed by a chemical polymerization method.
n in chemical formula (2), where M represents a valve metal and n represents an integer or a decimal fraction from 1 to 6, or a composite thereof, a method of manufacturing the anode element, and a solid electrolytic capacitor employing the anode element are provided.
Disclosed is a wound solid electrolytic capacitor wherein increase in leakage current due to separation of a hard coating film from the cathode is suppressed. Specifically disclosed is a solid electrolytic capacitor comprising a wound capacitor element having an anode (2), a cathode (3) composed of aluminum, a hard coating film (28) formed on the surface of the cathode (3), a separator (4b) and a solid electrolyte layer. The solid electrolytic capacitor further comprises an intermediate layer (18) which is formed between the cathode (3) and the hard coating film (28). The hard coating film (28) is composed of a compound containing aluminum, titanium and at least one nonmetallic element, and the intermediate layer (18) contains at least one element selected from the metal element group consisting of aluminum and titanium. It is particularly preferable that the hardness of the material constituting the intermediate layer (18) of the solid electrolytic capacitor is lower than the hardness of the material constituting the hard coating film (28).
The electrolytic capacitor includes two chemically processed anode foils, two cathode foils, four separator sheets, four lead tab terminals, two anode leads and two cathode leads. The two chemically processed anode foils, two cathode foils and four separator sheets are arranged alternately and rolled, to form a capacitor element. Two lead tab terminals are connected to the two chemically processed anode foils, respectively, and the remaining two lead tab terminals are connected to two cathode foils, respectively. The two anode leads are connected to two lead tab terminals, respectively, and the two cathode leads are connected to two lead tab terminals, respectively. As a result, equivalent series resistance can stably be reduced.
The invention provides a solid electrolytic capacitor wherein the anode has a dielectric oxide film of a structure less susceptible to damage due to mechanical stresses and which is diminished in leakage current and less prone to short-circuiting, and a process for fabricating the capacitor. The capacitor of the invention comprises an anode of aluminum having a dielectric oxide film formed over a surface thereof from amorphous alumina, and is characterized in that a plurality of tunnel-shaped etching pits are formed in the anode. The process of the invention for fabricating the solid electrolytic capacitor includes the steps of forming a plurality of tunnel-shaped etching pits in an aluminum material, effecting anodic oxidation by immersing the aluminum material in an electrolytic solution containing oxalic acid or the like, and effecting anodic oxidation by immersing the aluminum material in an electrolytic solution containing boric acid or like inorganic acid or a salt thereof or containing adipic acid or like organic acid or a salt thereof and applying a voltage at least three times the rated voltage of the capacitor.
patents
