Patent ID: 8637204

Claim:
A fuel cell stack formed by stacking a plurality of fuel cells comprising: a first fuel cell; and a second fuel cell adjacent to the first fuel cell, wherein each of the first fuel cell and the second fuel cell includes: an electrode membrane assembly formed by a pair of electrodes sandwiching a solid polymer electrolyte membrane, a first separator and a second separator sandwiching outsides of the pair of electrodes, wherein each separator includes a plurality of communication holes, the plurality of communication holes including reactant gas communication holes and cooling medium communication holes, and insulating members provided around the plurality of communication holes; wherein a first space is formed between the insulating members formed on the first separator and the insulating members formed on the second separator, or wherein a second space is formed between the insulating members formed on the first separator of the first fuel cell and the insulating members formed on the second separator of the second fuel cell adjacent to the first separator of the first fuel cell, when the first fuel cell and the second fuel cell are stacked in a stacking direction.