Patent ID: 6926985

Claim:
A fuel cell stack comprising a plurality of fuel cell modules connected together with an intermediate plate interposed between an adjacent two of said fuel cell modules, said fuel cell modules each formed by stacking a plurality of membrane electrode assemblies and separators alternately in a stacking direction, said membrane electrode assemblies each including an anode, a cathode, and a membrane electrode assembly interposed between said anode and said cathode, wherein at least of one reactant gas passage and a coolant passage extend through said fuel cell modules such that said reactant gas flows in said reactant gas passage and said coolant flows in said coolant passage in opposite directions with respect to said stacking direction, said reactant gas passage includes a reactant gas inlet and a reactant gas outlet in each of said fuel cell modules, wherein said intermediate plate changes a flowing direction of said reactant gas such that said reactant gas flowing out of said reactant gas outlet of one of said fuel cell modules flows into said reactant gas inlet of the next fuel cell module of said fuel cell modules, and said coolant passage includes a coolant inlet and a coolant outlet in each of said fuel cell modules such that said coolant flowing out of said coolant outlet of one of said fuel cell modules flows into said coolant inlet of the next fuel cell module of said fuel cell modules.