Fuel cell cooling system using a non-dielectric coolant

Details Fuel cell cooling system using a non-dielectric coolant Fuel cell cooling system using a non-dielectric coolant

H - Electricity

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H01M 8/04 (2006.01) H01M 8/02 (2006.01) H01M 8/08 (2006.01) H01M 8/24 (2006.01)

Patent

CA 1065397

FUEL CELL COOLING SYSTEM USING A NON-DIELECTRIC COOLANT ABSTRACT OF THE DISCLOSURE A cooler for removing waste heat from a stack of fuel cells uses a non-dielectric coolant which is carried in a plurality of tubes passing through one or more separator plates in the stack. Preferably the coolant is water so that heat removal is by evaporation of the water within the tubes by boiling. The tubes are electrically insulated from the cells by a coating of dielectric material such as polytetrafluoroethylene. In one embodiment of the present invention the cooler tubes are connected to the stack coolant supply conduits by dielectric hoses having a high length to diameter ratio to provide a several hundred thousand ohm impedance path in case of a flaw in the pro- tective dielectric coating, in order that a short circuit of the stack does not occur. -1-

251980

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