Fuel cell cooling system with shunt current protection

Details Fuel cell cooling system with shunt current protection Fuel cell cooling system with shunt current protection

H - Electricity

01

M

319/5

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

Patent

CA 1065396

FUEL CELL COOLING SYSTEM WITH SHUNT CURRENT PROTECTION ABSTRACT OF THE DISCLOSURE A fuel cell coolant system for use with a plurality of fuel cell stacks connected electrically in series is adapted to use a non-dielectric coolant carried through each stack by electrically conductive tubes. Each stack also includes a plenum for distributing coolant to the tubes. To prevent short circuits across the stacks due to shunt currents in the coolant the plenums are electrically insulated from a grounded main coolant supply line, such as by dielectric hose connections, and each plenum is electrically connected to one end of its respective stack. By this invention the maximum driving potential for any shunt current is the potential drop across a stack rather than the potential drop from a stack to ground. In a preferred embodiment dielectric hoses are used to connect the plenums to the tubes in order to prevent short circuiting across cells within a stack. -1-

251979

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