Patent ID: 7695845

Claim:
A fuel cell comprising power generation units each including at least first and second electrolyte electrode assemblies, said first electrolyte electrode assembly being stacked on a first metal separator, a second metal separator being stacked on said first electrolyte electrode assembly, said second electrolyte electrode assembly being stacked on said second metal separator, a third metal separator being stacked on said second electrolyte electrode assembly, said first and second electrolyte electrode assemblies each including a pair of electrodes and an electrolyte interposed between said electrodes, first through fourth reactant gas flow fields being formed between said first metal separator and said first electrolyte electrode assembly, between said first electrolyte electrode assembly and said second metal separator, between said second metal separator and said second electrolyte electrode assembly, and between said second electrolyte electrode assembly and said third metal separator, respectively, for flowing a predetermined reaction gas along power generation surfaces, said first through fourth reactant gas flow fields having a plurality of flow grooves, a coolant flow field being formed between said power generation units for flowing a coolant, wherein an electrode catalyst is deposited on the same area in each of said first and second electrolyte electrode assemblies, the number of the flow grooves in said entire first reactant gas flow field for flowing one reactant gas is different from that of the flow grooves in said entire third reactant gas flow field for flowing the one reactant gas, and the number of the flow grooves in said entire second reactant gas flow field for flowing another reactant gas is different from that of the flow grooves in said entire fourth reactant gas flow field for flowing the other reactant gas.