FUEL CELL, FUEL CELL STACK AND METHOD OF MANUFACTURING THE SAME

摘要

A fuel cell stack and method of manufacturing a fuel cell stack having a highly anti- corrosive property. The fuel cell stack (1) includes a pluralit y of cells (2) constructed by interposing an electrolyte membrane electrode assembly (3) between the first and second separators (7A and 7C). The first and second separators (7A and 7C) define gas passages (8 A and 8C) on from b oth sides of the electrolyte membrane electrode assembly (3), and a gas mani fold (31C) is in fluid communication with the gas flow passages (8 A and 8C) through the plurality of stacked cells. Manifold openings (45 and 46) for d efining the gas manifold (31 C) are formed in the first and second separator s (7A and 7C), and the opening areas of the manifold openings (45 and 46) ar e differently sized. The manifold opening inner peripheral end (49) of the f irst separator (7A) has a larger opening area, and is welded to the second s eparator (7C) to form a manifold welding portion (41C).