Patent ID: 7320841
Filing Date: 2008-01-22
Classification: H01M,Y02E

Abstract:
1. A fuel cell having at least one unit comprising a first separator in which a fuel gas passage section is formed, a first seal sheet which seals the first separator periphery, a fuel gas diffusion layer, an anode, a polymer electrolyte, a cathode, an oxidizing gas diffusion layer, a second seal sheet which seals a second separator periphery and second separator in which an oxidizing gas passage section is formed, in this order, wherein the fuel gas passage section and oxidizing gas passage section are in communication with a fuel gas manifold in the first separator and an oxidizing gas manifold in the second separator, respectively, a comb teeth structure, having comb teeth, is provided between the fuel gas passage section and fuel gas manifold and another comb teeth structure, having comb teeth, is provided between the oxidizing gas passage section and the oxidizing gas manifold, slit spaces are formed between the comb teeth so as to be in communication with the fuel gas and oxidizing gas diffusion layers, and the fuel gas manifold in the first separator is in communication with the fuel gas passage section via the slit spaces between comb teeth of the comb teeth structure, and the oxidizing gas manifold in the second separator is in communication with the oxidizing gas passage section via the slit spaces between comb teeth of the another comb teeth structure, wherein the fuel gas diffusion layer and the oxidizing gas diffusion layer are of a porous material, and at least one of (a) the comb teeth structure is part of the fuel gas diffusion layer and (b) the another comb teeth structure is part of the oxidizing gas diffusion layer.