Patent ID: 7163760

Claim:
A fuel cell stack comprising a stack body formed by a plurality of electrolyte electrode assemblies stacked together in a stacking direction between first and second end plates, said electrolyte electrode assemblies each interposed between separators, and including electrodes and an electrolyte interposed between said electrodes, wherein a reactant gas supply passage extends through at least one port in the first end plate and through said stack body in said stacking direction for supplying a reactant gas to said electrodes, and a reactant gas discharge passage extends through at least one port in the first end plate and through said stack body in said stacking direction for discharging said reactant gas from said stack body, said reactant gas including at least one of an oxygen-containing gas and a fuel gas, said fuel cell stack further comprising: a bypass flow passage connected to said reactant gas supply passage at a position near an inlet of said reactant gas supply passage and near said first end plate, and connected to said reactant gas discharge passage; and an extension for removing water from said reactant gas at a position near said inlet of said reactant gas supply passage, and discharging said water into said bypass flow passage.