Patent ID: 7344794
Filing Date: 2008-03-18
Classification: H01M,Y02E

Abstract:
1. A fuel cell formed by stacking power generation cells each including a membrane electrode assembly and first and second separators sandwiching said membrane electrode assembly, said membrane electrode assembly including a first electrode, a second electrode, and an electrolyte membrane interposed between said first electrode and said second electrode, wherein a surface area of said second electrode is larger than a surface area of said first electrode, and reactant gas flow fields are formed between said membrane electrode assembly and said first and second separators for supplying reactant gases along electrode surfaces of said first and second electrodes, said fuel cell comprising: a first seal member provided on said first separator and a second seal member provided on said second separator, wherein said second seal member includes an inner seal portion and an outer seal portion provided on one surface of said second seal member facing said electrode; wherein said inner seal portion is interposed between said electrolyte membrane and said second separator, and wherein said outer seal portion is interposed between said first and second separators and contacts said first seal member, wherein, when a load is applied to said inner seal portion and said outer seal portion in a stacking direction of said power generation cells, said inner seal portion and said outer seal portion are deformed substantially equally in said stacking direction to the same extent.