Patent ID: 8409767

Claim:
A fuel cell comprising: a membrane electrode assembly and separators which are stacked, the membrane electrode assembly comprising: an electrolyte membrane; and a pair of electrodes sandwiching the electrolyte membrane therebetween; a fuel gas channel and an oxidant gas channel extending in a longitudinal direction of the separators, the fuel gas channel allowing a fuel gas to linearly flow along a surface of one of the pair of electrodes and the oxidant gas channel allowing an oxidant gas to linearly flow along a surface of another of the pair of electrodes; a fuel gas inlet manifold and a fuel gas outlet manifold extending in a stacking direction through respective ends of the separators in a longitudinal direction of the separators at diagonally opposite positions of the fuel gas channel; and an oxidant gas inlet manifold and an oxidant gas outlet manifold extending in the stacking direction through respective ends of the separators in the longitudinal direction of the separators at diagonally opposite positions of the oxidant gas channel, wherein a channel width of the oxidant gas channel in a central portion of the oxidant gas channel in a channel width direction is larger than a channel width of the oxidant gas channel in both end portions of the oxidant gas channel in the channel width direction, and wherein a channel width of the fuel gas channel in a central portion of the fuel gas channel in a channel width direction is smaller than a channel width of the fuel gas channel in both end portions of the fuel gas channel in the channel width direction.