Abstract

An electrolyzer or unitized regenerative fuel cell has a flow field with at least one channel, wherein the cross-sectional area of the channel varies along at least a portion of the channel length. In some embodiments the channel width decreases along at least a portion of the length of the channel according to a natural exponential function. The use of this type of improved flow field channel can improve performance and efficiency of operation of the electrolyzer device.

IPC Classes  ?

• C25B 1/04 - Hydrogen or oxygen by electrolysis of water
• C25B 9/19 - Cells comprising dimensionally-stable non-movable electrodesAssemblies of constructional parts thereof with diaphragms
• C25B 9/70 - Assemblies comprising two or more cells
• C25B 9/73 - Assemblies comprising two or more cells of the filter-press type
• C25B 11/00 - ElectrodesManufacture thereof not otherwise provided for
• H01M 8/026 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
• H01M 8/0263 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/0267 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors having heating or cooling means, e.g. heaters or coolant flow channels
• H01M 8/0656 - Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants by electrochemical means
• H01M 8/10 - Fuel cells with solid electrolytes
• H01M 8/18 - Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
• H01M 8/241 - Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
• H01M 8/2457 - Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
• H01M 8/2465 - Details of groupings of fuel cells
• H01M 8/2483 - Details of groupings of fuel cells characterised by internal manifolds

Abstract

In some embodiments, fuel cell assemblies can include fuel cell flow field plates with reduced, if not eliminated, transition regions. In some embodiments, methods and apparatus can reduce, if not eliminate, the area occupied by transition regions on a fuel cell plate in a fuel cell assembly. In some embodiments, the fuel cell stacks can include an oxidant inlet assembly including a sculpted oxidant inlet connector, and a feed-plate with a sculpted opening. In some embodiments, the fuel cell stacks can include an oxidant outlet assembly including a feed-plate with a sculpted opening, and a sculpted oxidant outlet connector.

IPC Classes  ?

• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/04082 - Arrangements for control of reactant parameters, e.g. pressure or concentration
• H01M 8/2475 - Enclosures, casings or containers of fuel cell stacks
• H01M 8/248 - Means for compression of the fuel cell stacks

Abstract

The present technology relates to apparatus and methods for providing contact pressure distribution between fuel cell components in a fuel cell stack. In some embodiments, the technology relates to fuel cell flow field plate designs and to compression systems for fuel cell stacks that can be used, separately or in combination, to provide more uniform contact pressure distribution across the active area of fuel cells in a fuel cell stack.

IPC Classes  ?

• H01M 8/248 - Means for compression of the fuel cell stacks
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/1004 - Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]

Goods & Services

Electrochemical power generators; electrochemical power generation systems comprised of fuel cells, fuel cell stacks, fuel cell plates, and membrane electrode assemblies; electrochemical power plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; cooling/heat exchanger systems (term considered too vague by the International Bureau - Rule 13 (2) (b) of the Regulations); electrochemical hydrogen generation equipment with one or more stacks of electrochemical fuel cells with anodes, cathodes and solid polymer electrolytes. Fuel cells; fuel cell stacks; fuel cell plates; integrated fuel cell power generating modules, systems and plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; electrolysis apparatus for hydrogen generation; electrolyzer stacks; electrolyzer plates; downloadable electronic publications in the field of hydrogen and fuel cell technology, clean energy and environmental sustainability; power conditioning/converter systems. Custom manufacturing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; integration of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates (term considered too vague by the International Bureau - Rule 13.2.b) of the Common Regulations). Testing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; research, design and development of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; providing technological information the field of hydrogen and fuel cell technology, clean energy, and environmental sustainability.

Goods & Services

Electrochemical power generators; electrochemical power generation systems comprised of fuel cells, fuel cell stacks, fuel cell plates, and membrane electrode assemblies; electrochemical power plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; cooling/heat exchanger systems (term considered too vague by the International Bureau - Rule 13 (2) (b) of the Regulations); electrochemical hydrogen generation equipment with one or more stacks of electrochemical fuel cells with anodes, cathodes and solid polymer electrolytes. Fuel cells; fuel cell stacks; fuel cell plates; integrated fuel cell power generating modules, systems and plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; electrolysis apparatus for hydrogen generation; electrolyzer stacks; electrolyzer plates; downloadable electronic publications in the field of hydrogen and fuel cell technology, clean energy and environmental sustainability; power conditioning/converter systems. Custom manufacturing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; integration of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates (term considered too vague by the International Bureau - Rule 13.2.b) of the Common Regulations). Testing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; research, design and development of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; providing technological information the field of hydrogen and fuel cell technology, clean energy, and environmental sustainability.

Abstract

Electrolyzer assemblies can include a proton exchange membrane electrolyte, or an anion exchange membrane electrolyte. In at least some embodiments, electrolyzer assemblies can be operated with liquid water supplied to the cathode and a humidified gas stream supplied to the anode. In some such electrolyzer assemblies and modes of operating them, it can be beneficial if the cross-sectional fluid flow area of the anode varies along at least a portion of the length of the anode flow field and/or if the cross-sectional fluid flow area of the cathode flow field varies along at least a portion of the length of the cathode flow field.

IPC Classes  ?

• C25B 9/60 - Constructional parts of cells
• C25B 1/04 - Hydrogen or oxygen by electrolysis of water
• C25B 9/23 - Cells comprising dimensionally-stable non-movable electrodesAssemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
• C25B 9/70 - Assemblies comprising two or more cells
• C25B 15/08 - Supplying or removing reactants or electrolytesRegeneration of electrolytes

Abstract

Methods and apparatus for reducing the tendency for mold formation and accumulation in membrane-based humidifiers used in PEM fuel cell systems can include reducing the oxygen concentration and/or generating hydrogen peroxide within the humidifier upon shutdown of a fuel cell system. In some embodiments, a fuel cell system comprises valves and lines located and operable to facilitate introduction of hydrogen into the humidifier upon shutdown of the system. In some embodiments, a fuel cell humidifier comprises a catalyst for promoting the generation of hydrogen peroxide from hydrogen and oxygen, and/or comprises acidic gas transport layers.

IPC Classes  ?

• H01M 8/04119 - Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyteHumidifying or dehumidifying
• H01M 8/1007 - Fuel cells with solid electrolytes with both reactants being gaseous or vaporised
• H01M 8/04089 - Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
• H01M 8/04228 - Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-downDepolarisation or activation, e.g. purgingMeans for short-circuiting defective fuel cells during shut-down
• H01M 8/04303 - Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during shut-down
• H01M 8/04746 - PressureFlow
• H01M 8/04082 - Arrangements for control of reactant parameters, e.g. pressure or concentration
• H01M 8/04223 - Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-downDepolarisation or activation, e.g. purgingMeans for short-circuiting defective fuel cells

Abstract

methods and apparatus for reducing the tendency for mold formation and accumulation in membrane-based humidifiers used in PEM fuel cell systems can include reducing the oxygen concentration and/or generating hydrogen peroxide within the humidifier upon shutdown of a fuel cell system. In some embodiments, a fuel cell system comprises valves and lines located and operable to facilitate introduction of hydrogen into the humidifier upon shutdown of the system. In some embodiments, a fuel cell humidifier comprises a catalyst for promoting the generation of hydrogen peroxide from hydrogen and oxygen, and/or comprises acidic gas transport layers.

IPC Classes  ?

• H01M 8/04119 - Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyteHumidifying or dehumidifying
• H01M 8/2465 - Details of groupings of fuel cells

Abstract

In some embodiments, fuel cell assemblies can include fuel cell flow field plates with reduced, if not eliminated, transition regions. In some embodiments, methods and apparatus can reduce, if not eliminate, the area occupied by transition regions on a fuel cell plate in a fuel cell assembly. In some embodiments, the fuel cell stacks can include an oxidant inlet assembly including a sculpted oxidant inlet connector, and a feed-plate with a sculpted opening. In some embodiments, the fuel cell stacks can include an oxidant outlet assembly including a feed-plate with a sculpted opening, and a sculpted oxidant outlet connector.

IPC Classes  ?

• H01M 8/0258 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
• H01M 8/248 - Means for compression of the fuel cell stacks
• H01M 8/2483 - Details of groupings of fuel cells characterised by internal manifolds

Abstract

In some embodiments, fuel cell assemblies can include fuel cell flow field plates with reduced, if not eliminated, transition regions. In some embodiments, methods and apparatus can reduce, if not eliminate, the area occupied by transition regions on a fuel cell plate in a fuel cell assembly. In some embodiments, the fuel cell stacks can include an oxidant inlet assembly including a sculpted oxidant inlet connector, and a feed-plate with a sculpted opening. In some embodiments, the fuel cell stacks can include an oxidant outlet assembly including a feed-plate with a sculpted opening, and a sculpted oxidant outlet connector.

IPC Classes  ?

• H01M 8/2483 - Details of groupings of fuel cells characterised by internal manifolds
• H01M 8/248 - Means for compression of the fuel cell stacks
• H01M 8/0258 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant

Goods & Services

Electrochemical power generators; electrochemical power generation systems comprised of fuel cells, fuel cell stacks, fuel cell plates, and membrane electrode assemblies; electrochemical power plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; cooling/heat exchanger systems; power conditioning/converter systems; electrochemical hydrogen generation equipment with one or more stacks of electrochemical fuel cells with anodes, cathodes and solid polymer electrolytes. Fuel cells; fuel cell stacks; fuel cell plates; integrated fuel cell power generating modules, systems and plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; electrolysis apparatus for laboratory use; electrolyzer stacks; electrolyzer plates; downloadable electronic publications in the field of hydrogen and fuel cell technology, clean energy and environmental sustainability. Custom manufacturing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; integration of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates. Research, design and development of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; providing technological information the field of hydrogen and fuel cell technology, clean energy, and environmental sustainability; testing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates.

Goods & Services

Fuel cells; fuel cell stacks; fuel cell plates; electrolysis apparatus for hydrogen generation; electrolyzer stacks; electrolyzer plates.

Goods & Services

(1) Electrochemical power generators; Electrochemical power generation systems comprised of fuel cells, fuel cell stacks, fuel cell plates, and membrane electrode assemblies; Electrochemical power plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; Cooling/heat exchanger systems; Power conditioning/converter systems; Electrochemical hydrogen generation equipment with one or more stacks of electrochemical fuel cells with anodes, cathodes and solid polymer electrolytes (2) Fuel cells; Fuel cell stacks; Fuel cell plates; Integrated fuel cell power generating modules, systems and plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; Electrolysis apparatus for hydrogen generation; Electrolyzer stacks; Electrolyzer plates; Downloadable electronic publications in the field of hydrogen and fuel cell technology, clean energy and environmental sustainability (1) Custom manufacturing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; Integration of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates (2) Testing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; research, design and development of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; Providing technological information the field of hydrogen and fuel cell technology, clean energy, and environmental sustainability

Goods & Services

(1) Electrochemical power generators; Electrochemical power generation systems comprised of fuel cells, fuel cell stacks, fuel cell plates, and membrane electrode assemblies; Electrochemical power plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; Cooling/heat exchanger systems; Power conditioning/converter systems; Electrochemical hydrogen generation equipment with one or more stacks of electrochemical fuel cells with anodes, cathodes and solid polymer electrolytes (2) Fuel cells; Fuel cell stacks; Fuel cell plates; Integrated fuel cell power generating modules, systems and plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; Electrolysis apparatus for hydrogen generation; Electrolyzer stacks; Electrolyzer plates; Downloadable electronic publications in the field of hydrogen and fuel cell technology, clean energy and environmental sustainability (1) Custom manufacturing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; integration of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates (2) Testing of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; research, design and development of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; providing technological information the field of hydrogen and fuel cell technology, clean energy, and environmental sustainability

Abstract

The present technology relates to apparatus and methods for providing contact pressure distribution between fuel cell components in a fuel cell stack. In some embodiments, the technology relates to fuel cell flow field plate designs and to compression systems for fuel cell stacks that can be used, separately or in combination, to provide more uniform contact pressure distribution across the active area of fuel cells in a fuel cell stack.

IPC Classes  ?

• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/1004 - Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
• H01M 8/248 - Means for compression of the fuel cell stacks

Abstract

The present technology relates to apparatus and methods for providing contact pressure distribution between fuel cell components in a fuel cell stack. In some embodiments, the technology relates to fuel cell flow field plate designs and to compression systems for fuel cell stacks that can be used, separately or in combination, to provide more uniform contact pressure distribution across the active area of fuel cells in a fuel cell stack.

IPC Classes  ?

• H01M 8/248 - Means for compression of the fuel cell stacks
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/1004 - Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]

Goods & Services

Custom manufacturing of electrical equipment, apparatus and machines for generating electricity, namely, electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converters, cooling/heat exchangers, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; generation of electricity Electrochemical power generators; electrochemical power generation systems comprising fuel cells, fuel cell stacks, fuel cell plates, and membrane electrode assemblies; electric power generators using electrochemical power comprising fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchangers, power conditioning/converters, and operating controls; cooling/heat exchangers being parts of machines; torque converters other than for land vehicles; electrochemical power generators with one or more stacks of electrochemical fuel cells with anodes, cathodes and solid polymer electrolytes Fuel cells; fuel cell stacks; fuel cell plates; integrated fuel cell apparatus comprised primarily of fuel cells, fuel cell stacks, fuel cell plates, and also including membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchangers, power conditioning/converters, and operating controls; electrolysis apparatus for laboratory use; hydrogen power storage apparatus comprising electrolyzer stacks and electrolyzer plates for converting electrical energy to hydrogen gas; downloadable electronic publications in the nature of articles, brochures, newsletters and presentations in the field of hydrogen and fuel cell technology, clean energy and environmental sustainability Product research, product design and development in the field of electrical equipment, apparatus and machines for generating electricity, namely, electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; providing technology information in the field of hydrogen and fuel cell technology, clean energy, and environmental sustainability; testing the functionality of electrical equipment, apparatus and machines for generating electricity, namely, electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates

Goods & Services

(1) Fuel cells; Fuel cell stacks; Fuel cell plates; Electrolyzers; Electrolyzer stacks; Electrolyzer plates

Goods & Services

(1) Electrochemical power generators; Electrochemical power generation systems comprised of fuel cells, fuel cell stacks, fuel cell plates, and membrane electrode assemblies; Electrochemical power plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; Cooling/heat exchanger systems; Power conditioning/converter systems; Electrochemical hydrogen generation equipment with one or more stacks of electrochemical fuel cells with anodes, cathodes and solid polymer electrolytes (2) Fuel cells; Fuel cell stacks; Fuel cell plates; Integrated fuel cell power generating modules, systems and plants comprised of fuel cells, fuel cell stacks, fuel cell plates, membrane electrode assemblies, pumps, compressors, valves, humidifiers, humidity exchangers, fuel tanks, fuel vaporizers, filters, oxidant purifiers, oxidant converters, cooling/heat exchanger systems, power conditioning/converter systems, and operating controls; Electrolyzers; Electrolyzer stacks; Electrolyzer plates; Downloadable electronic publications in the field of hydrogen and fuel cell technology, clean energy and environmental sustainability (1) Manufacturing, testing and integration of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates (2) Research, design and development of electrical equipment, apparatus and machines for generating electricity, namely electrochemical power generators, electrochemical power generation systems, electrochemical power plants, power conditioning/converter systems, cooling/heat exchanger systems, operating controls, fuel cells, fuel cell stacks, fuel cell plates, electrolyzers, electrolyzer stacks and electrolyzer plates; Providing technological information the field of hydrogen and fuel cell technology, clean energy, and environmental sustainability

Abstract

An electrolyzer or unitized regenerative fuel cell has a flow field with at least one channel, wherein the cross-sectional area of the channel varies along at least a portion of the channel length. In some embodiments the channel width decreases along at least a portion of the length of the channel according to a natural exponential function. The use of this type of improved flow field channel can improve performance and efficiency of operation of the electrolyzer device.

IPC Classes  ?

• C25B 1/04 - Hydrogen or oxygen by electrolysis of water
• C25B 9/19 - Cells comprising dimensionally-stable non-movable electrodesAssemblies of constructional parts thereof with diaphragms
• C25B 9/70 - Assemblies comprising two or more cells
• C25B 9/73 - Assemblies comprising two or more cells of the filter-press type
• C25B 11/00 - ElectrodesManufacture thereof not otherwise provided for
• H01M 8/026 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
• H01M 8/0263 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/0267 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors having heating or cooling means, e.g. heaters or coolant flow channels
• H01M 8/0656 - Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants by electrochemical means
• H01M 8/10 - Fuel cells with solid electrolytes
• H01M 8/18 - Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
• H01M 8/241 - Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
• H01M 8/2457 - Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
• H01M 8/2465 - Details of groupings of fuel cells
• H01M 8/2483 - Details of groupings of fuel cells characterised by internal manifolds

Abstract

Fuel cell assemblies comprising at least one thermally compensated coolant channel are provided. The thermally compensated coolant channel has a cross-sectional area that decreases in the coolant flow direction along at least a portion of the channel length. In some embodiments, such thermally compensated coolant channels can be used to provide substantially uniform heat flux, and substantially isothermal conditions, in fuel cells operating with substantially uniform current density.

IPC Classes  ?

• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/0267 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors having heating or cooling means, e.g. heaters or coolant flow channels
• H01M 8/0258 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
• H01M 8/0263 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
• H01M 8/04007 - Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
• H01M 8/04701 - Temperature
• H01M 8/04746 - PressureFlow
• H01M 8/2465 - Details of groupings of fuel cells
• H01M 8/10 - Fuel cells with solid electrolytes

Abstract

A fuel cell anode flow field includes at least one flow channel with a cross-sectional area that varies along at least a portion of its length. In some embodiments, the channel width decreases along at least a portion of the channel length according to a natural exponential function. This type of anode flow field can improve performance, reduce fuel consumption and/or reduce detrimental effects such as carbon corrosion and catalyst degradation, thereby improving fuel cell longevity and durability. When operating the fuel cell on either a substantially pure or a dilute fuel stream, this type of anode flow field can provide more uniform current density. These flow channels can be incorporated into reactant flow field plates, fuel cells and fuel cell stacks.

IPC Classes  ?

• H01M 8/026 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
• H01M 8/1011 - Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/10 - Fuel cells with solid electrolytes

Abstract

A fuel cell power module includes a cylindrical housing encasing a fuel cell stack and an air supply. The housing has a major interior surface. The fuel cell stack can be cylindrical or hexagonal, and comprises fuel cells having an anode and an anode flow field plate, a cathode and a cathode flow field plate, and a membrane electrolyte interposed between the anode and the cathode. The air supply is directed to the plurality of fuel cell cathode flow field plates via a plenum defined by a space between the fuel cell stack and the housing major interior surface. The hexagonal fuel cell stack can be formed by a plurality of fuel cell groups shaped such that when aligned the fuel cell groups together constitute the hexagonal fuel cell stack.

IPC Classes  ?

• H01M 8/04014 - Heat exchange using gaseous fluidsHeat exchange by combustion of reactants
• H01M 8/0271 - Sealing or supporting means around electrodes, matrices or membranes
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/0267 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors having heating or cooling means, e.g. heaters or coolant flow channels
• H01M 8/241 - Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
• H01M 8/0263 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
• H01M 8/2483 - Details of groupings of fuel cells characterised by internal manifolds
• H01M 8/2484 - Details of groupings of fuel cells characterised by external manifolds
• H01M 8/2475 - Enclosures, casings or containers of fuel cell stacks
• H01M 8/248 - Means for compression of the fuel cell stacks
• H01M 8/04029 - Heat exchange using liquids
• H01M 8/04007 - Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
• H01M 8/04082 - Arrangements for control of reactant parameters, e.g. pressure or concentration
• H01M 8/00 - Fuel cellsManufacture thereof
• H01M 8/04089 - Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
• H01M 8/04291 - Arrangements for managing water in solid electrolyte fuel cell systems
• H01M 8/1018 - Polymeric electrolyte materials

Abstract

Fuel cell assemblies comprising at least one thermally compensated coolant channel are provided. The thermally compensated coolant channel has a cross-sectional area that decreases in the coolant flow direction along at least a portion of the channel length. In some embodiments, such thermally compensated coolant channels can be used to provide substantially uniform heat flux, and substantially isothermal conditions, in fuel cells operating with substantially uniform current density.

IPC Classes  ?

• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/0267 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors having heating or cooling means, e.g. heaters or coolant flow channels
• H01M 8/0263 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
• H01M 8/04007 - Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
• H01M 8/04701 - Temperature
• H01M 8/04746 - PressureFlow
• H01M 8/0258 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
• H01M 8/2465 - Details of groupings of fuel cells
• H01M 8/1018 - Polymeric electrolyte materials

Abstract

Fuel cell assemblies comprising at least one thermally compensated coolant channel are provided. The thermally compensated coolant channel has a cross-sectional area that decreases in the coolant flow direction along at least a portion of the channel length. In some embodiments, such thermally compensated coolant channels can be used to provide substantially uniform heat flux, and substantially isothermal conditions, in fuel cells operating with substantially uniform current density.

IPC Classes  ?

• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/2465 - Details of groupings of fuel cells

Abstract

Fuel cell assemblies comprising at least one thermally compensated coolant channel are provided. The thermally compensated coolant channel has a cross-sectional area that decreases in the coolant flow direction along at least a portion of the channel length. In some embodiments, such thermally compensated coolant channels can be used to provide substantially uniform heat flux, and substantially isothermal conditions, in fuel cells operating with substantially uniform current density.

IPC Classes  ?

• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/2465 - Details of groupings of fuel cells

Abstract

An electrolyzer or unitized regenerative fuel cell has a flow field with at least one channel, wherein the cross-sectional area of the channel varies along at least a portion of the channel length. In some embodiments the channel width decreases along at least a portion of the length of the channel according to a natural exponential function. The use of this type of improved flow field channel can improve performance and efficiency of operation of the electrolyzer device.

IPC Classes  ?

• C25B 1/04 - Hydrogen or oxygen by electrolysis of water
• C25B 11/00 - ElectrodesManufacture thereof not otherwise provided for
• C25B 9/19 - Cells comprising dimensionally-stable non-movable electrodesAssemblies of constructional parts thereof with diaphragms
• C25B 9/70 - Assemblies comprising two or more cells
• C25B 9/73 - Assemblies comprising two or more cells of the filter-press type
• H01M 8/0656 - Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants by electrochemical means
• H01M 8/2457 - Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
• H01M 8/2483 - Details of groupings of fuel cells characterised by internal manifolds
• H01M 8/241 - Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
• H01M 8/0263 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
• H01M 8/0267 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors having heating or cooling means, e.g. heaters or coolant flow channels
• H01M 8/026 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
• H01M 8/18 - Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/2465 - Details of groupings of fuel cells
• H01M 8/1018 - Polymeric electrolyte materials

Abstract

An electrolyzer or unitized regenerative fuel cell has a flow field with at least one channel, wherein the cross-sectional area of the channel varies along at least a portion of the channel length. In some embodiments the channel width decreases along at least a portion of the length of the channel according to a natural exponential function. The use of this type of improved flow field channel can improve performance and efficiency of operation of the electrolyzer device.

IPC Classes  ?

• H01M 2/38 - Arrangements for moving electrolytes
• C25B 1/06 - Electrolytic production of inorganic compounds or non-metals of hydrogen or oxygen by electrolysis of water in cells with flat or plate-like electrodes
• C25B 1/10 - Electrolytic production of inorganic compounds or non-metals of hydrogen or oxygen by electrolysis of water in diaphragm cells
• C25B 9/18 - Assemblies comprising a plurality of cells
• H01M 8/18 - Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
• H01M 8/0656 - Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants by electrochemical means
• H01M 8/0258 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
• H01M 8/026 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/2465 - Details of groupings of fuel cells
• H01M 8/1018 - Polymeric electrolyte materials

Abstract

A fuel cell power module includes a cylindrical housing encasing a fuel cell stack and an air supply. The housing has a major interior surface. The fuel cell stack can be cylindrical or hexagonal, and comprises fuel cells having an anode and an anode flow field plate, a cathode and a cathode flow field plate, and a membrane electrolyte interposed between the anode and the cathode. The air supply is directed to the plurality of fuel cell cathode flow field plates via a plenum defined by a space between the fuel cell stack and the housing major interior surface. The hexagonal fuel cell stack can be formed by a plurality of fuel cell groups shaped such that when aligned the fuel cell groups together constitute the hexagonal fuel cell stack.

IPC Classes  ?

• H01M 8/04 - Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
• H01M 8/04014 - Heat exchange using gaseous fluidsHeat exchange by combustion of reactants
• H01M 8/0271 - Sealing or supporting means around electrodes, matrices or membranes
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/0267 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors having heating or cooling means, e.g. heaters or coolant flow channels
• H01M 8/241 - Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
• H01M 8/0263 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
• H01M 8/2483 - Details of groupings of fuel cells characterised by internal manifolds
• H01M 8/2484 - Details of groupings of fuel cells characterised by external manifolds
• H01M 8/2475 - Enclosures, casings or containers of fuel cell stacks
• H01M 8/248 - Means for compression of the fuel cell stacks
• H01M 8/04029 - Heat exchange using liquids
• H01M 8/04007 - Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
• H01M 8/04082 - Arrangements for control of reactant parameters, e.g. pressure or concentration
• H01M 8/00 - Fuel cellsManufacture thereof
• H01M 8/04089 - Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
• H01M 8/04291 - Arrangements for managing water in solid electrolyte fuel cell systems
• H01M 8/1018 - Polymeric electrolyte materials

Abstract

A fuel cell anode flow field includes at least one flow channel with a cross-sectional area that varies along at least a portion of its length. In some embodiments, the channel width decreases along at least a portion of the channel length according to a natural exponential function. This type of anode flow field can improve performance, reduce fuel consumption and/or reduce detrimental effects such as carbon corrosion and catalyst degradation, thereby improving fuel cell longevity and durability. When operating the fuel cell on either a substantially pure or a dilute fuel stream, this type of anode flow field can provide more uniform current density. These flow channels can be incorporated into reactant flow field plates, fuel cells and fuel cell stacks.

IPC Classes  ?

• H01M 8/02 - Fuel cellsManufacture thereof Details
• H01M 8/026 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
• H01M 8/1011 - Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/10 - Fuel cells with solid electrolytes
• H01M 8/1018 - Polymeric electrolyte materials

Abstract

An electrolyzer or unitized regenerative fuel cell has a flow field comprising at least one channel, wherein the cross-sectional area of the channel varies along at least a portion of the channel length. In some embodiments the channel width decreases along at least a portion of the length of the channel according to a natural exponential function. The use of this type of improved flow field channel can improve performance and efficiency of operation of the electrolyzer device.

IPC Classes  ?

• C25B 1/04 - Hydrogen or oxygen by electrolysis of water
• C25B 9/19 - Cells comprising dimensionally-stable non-movable electrodesAssemblies of constructional parts thereof with diaphragms
• C25B 9/60 - Constructional parts of cells
• C25B 15/08 - Supplying or removing reactants or electrolytesRegeneration of electrolytes
• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/18 - Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells

Abstract

A fuel cell anode flow field comprises at least one flow channel with a cross- sectional area that varies along at least a portion of its length. In some embodiments, the channel width decreases along at least a portion of the channel length according to a natural exponential function. This type of anode flow field may improve performance, reduce fuel consumption and/or reduce detrimental effects such as carbon corrosion and catalyst degradation, thereby improving fuel cell longevity and durability. When operating the fuel cell on either a substantially pure or a dilute fuel stream, this type of anode flow field may provide more uniform current density, which is desirable for efficient fuel cell operation and improved fuel cell performance and lifetime. Variants of the non-conventional reactant flow channels are described, along with examples of incorporating such flow channels into reactant flow field plates, fuel cells and fuel cell stacks.

IPC Classes  ?

• H01M 4/86 - Inert electrodes with catalytic activity, e.g. for fuel cells
• H01M 8/04 - Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
• H01M 8/10 - Fuel cells with solid electrolytes

Abstract

A fuel cell anode flow field comprises at least one flow channel with a cross- sectional area that varies along at least a portion of its length. In some embodiments, the channel width decreases along at least a portion of the channel length according to a natural exponential function. This type of anode flow field may improve performance, reduce fuel consumption and/or reduce detrimental effects such as carbon corrosion and catalyst degradation, thereby improving fuel cell longevity and durability. When operating the fuel cell on either a substantially pure or a dilute fuel stream, this type of anode flow field may provide more uniform current density, which is desirable for efficient fuel cell operation and improved fuel cell performance and lifetime. Variants of the non-conventional reactant flow channels are described, along with examples of incorporating such flow channels into reactant flow field plates, fuel cells and fuel cell stacks.

IPC Classes  ?

• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections

Goods & Services

(1) Fuel cells. (1) Research and development in the field of fuel cells, manufacture and sale of fuel sells.

Goods & Services

(1) Fuel cells.

Abstract

A fuel cell cathode flow field has multiple channels each with a cross-sectional area that varies along the length of the channel such that oxygen availability at every lengthwise position along the channel is kept substantially constant for a given channel length and air stoichiometry ratio. Each channel comprises a flat floor with substantially constant depth and a pair of side walls extending upwardly from the floor; the side walls each taper inwards from channel inlet to outlet with a convex curve relative to the channel centreline. Achieving substantially uniform oxygen availability throughout the flow field results in substantially uniform current density throughout the flow field, which is desirable for efficient fuel cell operation and improved performance.

IPC Classes  ?

• H01M 8/04 - Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids

Abstract

A fuel cell cathode flow field has multiple channels each with a cross-sectional area that varies along the length of the channel such that oxygen availability at every lengthwise position along the channel is kept substantially constant for a given channel length and air stoichiometry ratio. Each channel comprises a flat floor with substantially constant depth and a pair of side walls extending upwardly from the floor; the side walls each taper inwards from channel inlet to outlet with a convex curve relative to the channel centreline. Achieving substantially uniform oxygen availability throughout the flow field results in substantially uniform current density throughout the flow field, which is desirable for efficient fuel cell operation and improved performance.

IPC Classes  ?

• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections
• H01M 8/1011 - Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]

Abstract

A fuel cell cathode flow field has multiple channels each with a cross- sectional area that varies along the length of the channel such that oxygen availability at every lengthwise position along the channel is kept substantially constant for a given channel length and air stoichiometry ratio. Each channel comprises a flat floor with substantially constant depth and a pair of side walls extending upwardly from the floor; the side walls each taper inwards from channel inlet to outlet with a convex curve relative to the channel centreline. Achieving substantially uniform oxygen availability throughout the flow field results in substantially uniform current density throughout the flow field, which is desirable for efficient fuel cell operation and improved performance.

IPC Classes  ?

• H01M 8/0265 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections