Patent ID: 7348086

Claim:
A fuel cell, comprising: a solid polymer electrolyte; catalyst layers disposed on both surfaces of the solid polymer electrolyte; gas diffusion layers having conductivity, the gas diffusion layers being disposed on the outer surfaces of the respective catalyst layers to function as an anode and a cathode, respectively; and separators including a fuel gas passage, an oxidizing gas passage and a coolant passage with walls therefor provided with a cathode-side wall and an anode-side wall, the separators being disposed on the outer surfaces of the respective gas diffusion layers, wherein the coolant passage, the fuel gas passage and the oxidizing gas passage overlap with the same plane, said plane being defined as a plane parallel to the plane of the gas diffusion layer, and wherein the cathode-side wall is in contact with the fuel gas passage and the cathode while being arranged therebetween, and the anode-side wall is in contact with the oxidizing gas passage and the anode while being arranged therebetween.