Patent ID: 9685664
Date: 2017-06-20
CPC Classifications: H01M,Y02E

Claim:
1. A fuel cell stack comprising: a plurality of fuel cells that are stacked, each of the fuel cells including a membrane electrode assembly and a separator that are stacked, the membrane electrode assembly including an electrolyte membrane and a pair of electrodes sandwiching the electrolyte membrane therebetween; a reactant gas channel through which a reactant gas flows along a surface of the separator; a reactant gas inlet manifold and a reactant gas outlet manifold through which the reactant gas flows in a direction in which the separator is stacked; an inlet buffer portion that connects an inlet of the reactant gas channel to the reactant gas inlet manifold; and an outlet buffer portion that connects an outlet of the reactant gas channel to the reactant gas outlet manifold, wherein the inlet buffer portion includes a plurality of linear inlet guide protrusions, and inlet guide channels, which connect the reactant gas inlet manifold to the reactant gas channel, are formed between the linear inlet guide protrusions, wherein a pitch between the linear inlet guide protrusions increases with increasing distance from the reactant gas inlet manifold, wherein the outlet buffer portion includes a plurality of linear outlet guide protrusions, and outlet guide channels, which connect the reactant gas outlet manifold to the reactant gas channel, are formed between the linear outlet guide protrusions, and wherein a pitch between the linear outlet guide protrusions is uniform.