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In a polymer electrolyte membrane type fuel cell employing a high polymer ion exchange membrane as an electrolyte, a fuel cells stack is produced at a low cost by easily constituting flow passages for a fuel gas, an oxidizing agent gas and a cooling water which have been conventionally constituted b

In a polymer electrolyte membrane type fuel cell employing a high polymer ion exchange membrane as an electrolyte, a fuel cells stack is produced at a low cost by easily constituting flow passages for a fuel gas, an oxidizing agent gas and a cooling water which have been conventionally constituted by a cutting process being hard to process and hard to reduce a cost. The fuel gas passage, the oxidizing agent gas flow passage and the cooling water flow passage are constructed by a combination of a diffuser constituted by a conductive porous body or a corrugated plate and an elastic gasket, whereby a cutting process is not required, and a number of parts can be reduced and an operating performance can be improved by integrally forming the gasket with the separator, so that a cost can be reduced.

대표청구항 ▼

1. A fuel cells stack comprising:a plurality of fuel cells each arranging an electrode on both sides of a solid electrolyte, separators, each including a gas impermeable and dense plate having a conductivity and gaskets, laminated to form a plurality of layers, current collectors gripping both ends

1. A fuel cells stack comprising:a plurality of fuel cells each arranging an electrode on both sides of a solid electrolyte, separators, each including a gas impermeable and dense plate having a conductivity and gaskets, laminated to form a plurality of layers, current collectors gripping both ends of said fuel cells stack, a fuel gas flow passage for supplying a fuel gas to the fuel cell provided on one side surface of the fuel cell, and an oxidizing agent gas flow passage for supplying an oxidizing agent gas to the fuel cell provided on the other side surface of the fuel cell, wherein: any one of said fuel gas flow passage, said oxidizing agent gas flow passage and a cooling water flow passage used for cooling said fuel cell is provided on a side surface of at least one of said fuel cell and the laminated separator, and the fuel gas flow passage, the oxidizing agent gas flow passage and the cooling water flow passage provided in said separator are constituted by a combination of the gasket formed in a one-piece configuration with the separator and a diffuser formed in a one-piece configuration with the separator and comprising a gas permeable body made of a material having a conductivity, said gasket and said diffuser form a pattern of at least one of said fuel gas flow passage, said oxidizing agent gas flow passage and said cooling water flow passage, and said diffuser seals a gap in at least one of said fuel gas flow passage, said oxidizing agent gas flow passage and said cooling water flow passage.