Polymer electrolyte fuel cell and bipolar separator for the same

摘要

A fuel cell has a joint body produced by interposing an electrolyte member between a pair of electrodes, and a separator (500A) which holds the joint body. The separator (500A) comprises a rib portion (555, 556) which divides an area which forms a fluid passage for fluid which flows through the separator, wherein the plurality of regions communicate with each other. The width (W1, W2, W3) of each region is different, with the width (W1) of the regions near an inlet portion of the fluid being wider than the width (W3) of the regions near an outlet portion of the fluid.