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A fuel cell stack system comprises a plurality of fuel cell sub-stacks, each of which comprises a plurality of individual fuel cell units. A separator plate separates the fuel cell units between an anode of one fuel cell unit and a cathode of an adjacent fuel cell unit. A single separator plate sepa

A fuel cell stack system comprises a plurality of fuel cell sub-stacks, each of which comprises a plurality of individual fuel cell units. A separator plate separates the fuel cell units between an anode of one fuel cell unit and a cathode of an adjacent fuel cell unit. A single separator plate separates corresponding fuel cell units in each fuel cell sub-stack. The edges of the separator plate extend substantially beyond the periphery of each fuel cell sub-stack forming oxidant flow paths between adjacent separator plates extending from the separator plate edges to the center of the separator plate from which oxidant is then distributed to each of the fuel cell units. By virtue of heat transfer from the extended edges of the separator plate to the oxidant, the heat generated by the fuel cell can be controlled.

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[ I claim:] [1.] In a fuel cell stack system having a fuel cell stack assembly comprising a plurality of sub-stacks, each of said sub-stacks comprising a plurality of individual fuel cell units, each of said fuel cell units comprising an anode and a cathode, an electrolyte in contact on one side wit

[ I claim:] [1.] In a fuel cell stack system having a fuel cell stack assembly comprising a plurality of sub-stacks, each of said sub-stacks comprising a plurality of individual fuel cell units, each of said fuel cell units comprising an anode and a cathode, an electrolyte in contact on one side with an electrolyte facing face of said anode and in contact on the opposite side with an electrolyte facing face of said cathode, and a separator plate separating said fuel cell units between said anode of one said fuel cell unit and said cathode of an adjacent said fuel cell unit forming an anode chamber between the anode facing face of said separator plate and said anode and forming a cathode chamber between the opposite cathode facing face of the cathode of said adjacent said fuel cell unit, said anode chamber in gas communication with a fuel gas supply and outlet and said cathode chamber in gas communication with an oxidant gas supply and outlet, said electrolyte and said separator plate extending to the peripheral edges of said sub-stack, said separator plate having a flattened peripheral wet seal structure extending to contact less than about 1 inch width of said electrolyte on each face of said separator plate completely around their periphery, forming a peripheral wet seal less than about 1 inch width under cell operating conditions, the improvement comprising:said separator plate extending a substantial distance beyond the peripheral edges of said sub-stack and separating corresponding fuel cell units in each of said sub-stacks;said separator plate together with an adjacent separator plate forming an internal oxidant gas feed path to a center of said separator plate from each side of said separator plate;said electrolytes and said separator plates each having a plurality of aligned perforations, said perforations in said separator plates being surrounded by a flattened manifold wet seal structure extending to contact less than about 1 inch width of said electrolyte on each face of said separator plate, forming a manifold wet seal less than about 1 inch width under cell operating conditions to form a plurality of gas manifolds extending through each of said sub-stacks;conduits through said extended manifold wet seal structure providing fuel gas communication between a fuel gas inlet gas manifold, said anode chambers, and a fuel gas outlet gas manifold on one face of said separator plate;conduits through said peripheral wet seal structure providing oxidant gas communication between each said internal oxidant gas feed path and said cathode chambers on the other face of said separator plate; andconduits through said extended manifold wet seal structure providing oxidant gas communication between said cathode chambers and an oxidant gas outlet gas manifold.