Fuel cell stack

摘要

A fuel cell stack comprises first and second separators (14, 16) for holding a fuel cell unit (12) therebetween. The first separator (14) has a fuel gas flow passage (40) and the second separator (16) has an oxygen-containing gas flow passage (50). The gas flow passages (40), (50) are formed by grooves with the number of grooves decreasing from the inlet to the outlet. In one embodiment, the gas flow passage (40) comprises twelve individual first gas flow passage grooves (42a to 42 l ) which communicate with an inlet hole (36a) on a gas inlet side, six individual second gas flow passage grooves (44a to 44f) which communicate with the first gas flow passage grooves (42a to 42 l ), and three individual third gas flow passage grooves (46a to 46c) which communicate with the second gas flow passage grooves (44a to 44f). The third gas flow passage grooves (46a to 46c) communicate with an outlet hole (38a) on a gas outlet side.