Fuel cell and method of manufacturing the fuel cell

H - Electricity – 01 – M

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H01M 8/04 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2444246

In order to prevent an electrolyte membrane from being broken, and make an assembling steps of a cell easy, in a fuel cell provided with a membrane electrode complex in which catalyst layers are respectively arranged on both surfaces of a electrolyte membrane, first and second gas diffusion layers which are arranged on both surfaces of the electrode complex, separators for respectively supplying reaction gas to the first and second gas diffusion layers, and a gasket for sealing the reaction gas, the gasket is formed on a surface of the gas diffusion layer so as to oppose to the separator, at least the gasket forming portion of the gas diffusion layer has a lower void content than the portion in contact with the catalyst layer, and the gasket arranged in the first and second gas diffusion layers is integrally formed at least via a through hole passing through the first and second gas diffusion layers.

L'invention concerne une pile à combustible comprenant un composite à électrode membranaire formé par déposition de couches de catalyse sur les deux surfaces d'une membrane électrolytique afin de prévenir la dégradation de la membrane électrolytique et faciliter le processus d'assemblage de la pile ; une première et une seconde couche de diffusion de gaz disposées sur les deux surfaces du composite à électrode membranaire ; un séparateur servant à alimenter en gaz de réaction la première et la seconde couche de diffusion de gaz ; et des joints servant à boucher le passage du gaz de réaction. Lesdits joints sont formés sur les surfaces des couches de diffusion de gaz à l'opposé du séparateur. Les parties de formation des joints des couches de diffusion de gaz au moins sont moins poreuses que les parties en contact avec les couches de catalyse, et les joints disposés sur la première et la seconde couche de diffusion de gaz sont intégrés l'un à l'autre par un trou de passage passant au moins par la première et la seconde couche de diffusion de gaz.

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