Patent ID: 6689504
Filing Date: 2004-02-10
Classification: H01M,Y02E

Abstract:
A fuel cell stack comprising a plurality of unit cells, each of said unit cells comprising;an assembly comprising a polymer electrolyte film and a pair of electrodes that are arranged across said polymer electrolyte film and respectively have a catalytic reaction layer; and a pair of separators that are arranged across said assembly, one having a means for supplying fuel gas to one of said electrodes and the other having a means for supplying oxidant gas to the other of said electrodes, wherein said separators between said assemblies of adjacent unit cells are formed as a laminate of at least one gas-tight conductive metal plate A, and at least two conductive metal plates B each having at least one slit which continuously meanders from one end to another end of said conductive plate B, each of said conductive metal plates B being a punched metal plate, wherein the outermost separators of said fuel cell stack are each formed as a laminate of another gas-tight conductive metal plate A and another conductive metal plate B having at least one slit, which continuously meanders from one end to another end of said conductive plate B, said another conductive plate B being a punched metal plate, wherein each conductive plate B has a lug formed by an end of said slit, said fuel cell stack furthering comprising an external manifold that is arranged on a side face of said fuel cell stack, so as to cause a gas to be fed to and discharged from each of said unit cells.