Patent ID: 8440361

Claim:
A fuel cell system, comprising: an air supplying unit in fluid communication with a fuel cell stack; a fuel supplying unit in fluid communication with the fuel cell stack; and a fuel tank in fluid communication with the fuel cell stack, wherein the fuel cell stack comprises a plurality of membrane electrode assemblies stacked with cathode electrodes of adjacent membrane electrode assemblies facing each other and anode electrodes of adjacent membrane electrode assemblies facing each other, and a plurality of separators interposed between the membrane electrode assemblies, each separator comprising a flow path passing therethrough from a first surface of the separator to a second surface of the separator in a region corresponding to a region of each cathode electrode or anode electrode of an adjacent membrane electrode assembly, wherein at least one of the plurality of separators comprises an insulation layer, a first current collector and a second current collector coupled to a first surface and a second surface of the insulation layer, respectively, wherein the flow path passes through the insulation layer, the first current collector, and the second current collector, wherein the insulation layer comprises: a first region between the first current collector and the second current collector, and a second region which extends out from the first current collector and the second current collector, wherein the flow path passes between the first region of the insulation layer and the second region of the insulation layer, and wherein the first region and the second region are located in the same plane of the separator.