Patent ID: 7560187

Claim:
A fuel cell stack comprising: a plurality of multi-cell modules stacked in series, each of the plurality of multi-cell modules comprising a plurality of fuel cells layered in a fuel cell stacking direction and including opposite end fuel cells, each of which is a dummy fuel cell generating no electrical power, at opposite ends of the plurality of fuel cells layered; and a restraining member, which extends in the fuel cell stacking direction over all of the plurality of multi-cell modules, for restraining each of the plurality of multi-cell modules in a direction perpendicular to the fuel cell stacking direction at the opposite end fuel cells of each of the plurality of multi-cell modules, wherein: each of the opposite end fuel cells of each of the plurality of multi-cell modules has an extended portion formed by extending each of the opposite end fuel cells of each of the plurality of multi-cell modules outwardly in a direction perpendicular to the fuel cell stacking direction of each of the plurality of multi-cell modules, each of the dummy fuel cells has an electrically conductive separator portion having substantially the same configuration as the plurality of cells and a protrusion fitted into an opening of the extended portion, and each of the plurality of multi-cell modules is restrained by the restraining member in the direction perpendicular to a fuel cell stacking direction of each of the plurality of multi-cell modules at the extended portion.