Patent ID: 7195837

Claim:
A fuel cell comprising: a stacked assembly having a plurality of stacked unit cells each having an electrolyte electrode assembly comprising an anode electrode, a cathode electrode, and an electrolyte layer interposed between said anode electrode and said cathode electrode, and first and second separators sandwiching said electrolyte electrode assembly; said first separator having hollow spaces for passing therethrough a fuel gas supplied to said anode electrode and a plurality of elongate first hollow ridges with first troughs interposed therebetween, the first hollow ridges creating a fuel gas flow path; said second separator having hollow spaces for passing therethrough an oxygen-containing gas supplied to said cathode electrode and a plurality of elongate second hollow ridges with second troughs interposed therebetween, said second hollow ridges extending in the same direction as said first hollow ridges, the second hollow ridges creating an oxygen-containing gas flow path; at least one of said first hollow ridges or said second hollow ridges having bent sections bent across the direction in which said fuel gas or said oxygen-containing gas flows causing the fuel gas flow path and the oxygen-containing gas flow path to cross each other where the first hollow ridges and the second hollow ridges contact each other and creating spaces between portions of crest surfaces of said first hollow ridges and portions of crest surfaces of said second hollow ridges from each other, and the crest surfaces of said first hollow ridges and the crest surfaces of said second hollow ridges face each other and are disposed adjacent to each other between the electrolyte electrode assemblies of said stacked assembly; said first troughs and said second troughs communicating with each other through said spaces between portions of the crest surfaces of said first hollow ridges and the crest surfaces of said second hollow ridges, so that a coolant can flow through said first troughs and said second troughs which communicate with each other.