Patent ID: 9005840
Filing Date: 2015-04-14
Classification: H01M,Y02E

Abstract:
1. A fuel cell stack comprising: a membrane electrode assembly having a polymer electrolyte membrane, a pair of catalyst electrodes, and a frame covering outer edges of the polymer electrolyte membrane and the pair of catalyst electrodes, the pair of catalyst electrodes including a fuel electrode and an air electrode sandwiching the polymer electrolyte membrane; and a pair of separators for a fuel cell that sandwiches the membrane electrode assembly by arranging the pair of separators at both sides of the membrane electrode assembly, wherein the pair of separators for a fuel cell comprising: a first separator and a second separator, each of the first separator and the second separator having a front surface and a rear surface and having at a center of the separator a corrugated plate section molded into a wave shape and at an outer edge of the separator a flat plate section enclosing the corrugated plate section, the corrugated plate section on the front surface constituting a reaction gas channel, the corrugated plate section on the rear surface constituting a coolant channel, the first separator and the second separator being arranged on top of each other so that the rear surfaces of the first separator and the second separator face each other and that the flat plate section of the first separator and the flat plate section of the second separator are in contact with each other, the flat plate section of the second separator protruding outwardly beyond the edge of the flat plate section of the first separator; sealing member A that is arranged on the flat plate section on the front surface of the first separator; sealing member B that is arranged on the flat plate section on the front surface of the second separator; and sealing member C that is arranged on a region on the flat plate section on the rear surface of the second separator, the region protruding outwardly beyond the flat plate section of the first separator, wherein the sealing member B is positioned opposite to the sealing member A with respect to the first separator and the second separator, and the frame has a protrusion at a position corresponding to a rear surface of the sealing member C to prevent a protruding region of the flat plate section of the second separator protruding outwardly beyond an edge of the flat plate section of the first separator from being deformed.