Patent ID: 7445866
Filing Date: 2008-11-04
Classification: H01M,Y02E,Y02T

Abstract:
1. A fuel cell stack comprising a stack body formed by stacking a plurality of electrolyte electrode assemblies and separators alternately in a stacking direction, said electrolyte electrode assemblies each including a pair of electrodes, and an electrolyte interposed between said electrodes, a reactant gas supply passage and a reactant gas discharge passage for at least one reactant gas extending through said stack body in the stacking direction, said fuel cell stack further comprising: terminal plates, insulating plates, and end plates provided at opposite ends of said stack body, wherein a bypass passage is formed between said stack body and said end plate, and said bypass passage is connected between said reactant gas supply passage and said reactant gas discharge passage, and said bypass passage is covered with an insulating seal member, an end separator is provided at an end of said stack body, a recess for accommodating said terminal plate is provided at the center of said insulating plate, and said bypass passage is formed between said insulating plate and said end separator, and provided outside said recess, a groove forming said bypass passage is provided on said insulating plate, and said end separator has said insulating seal member on a metal plate, and said insulating seal member includes a pair of protrusions which cover said bypass passage, and tightly contact said insulating plate.