Fuel cell sealing gasket apparatus and method

Details Fuel cell sealing gasket apparatus and method Fuel cell sealing gasket apparatus and method

H - Electricity

01

M

H01M 4/86 (2006.01) H01M 2/22 (2006.01) H01M 4/88 (2006.01) H01M 4/94 (2006.01)

Patent

CA 2146331

A membrane electrode and seal assembly (40) for an electrochemical fuel cell (10) comprises first and second layers of porous electrically conductive sheet material, such as carbon fiber paper (44, 50). The sheet material layers have a solid polymer ion exchange membrane (43) interposed therebetween. The sheet material layers cover and support the membrane (43) over substantially its entire surface area. The sheet material layers are coated with a catalyst (54) to render them electrochemically active, and are bonded together with the membrane to form a consolidated assembly. Openings (51, 52, 111, 112, 113, 114) are formed in the layers of sheet material and the membrane to accommodate the passage of fluids through the assembly. Channels (60, 61) formed in the layers of sheet material generally circumscribe the openings and the electrochemically active region of the sheet material. Solid preformed gaskets (62, 63) are disposed in the channels. The gasketing technique can also be applied to the membrane and seal assemblies (40) of the humidification portion (30) of fuel cell stacks (10).

Cette invention concerne un ensemble électrode à membrane-étanchéité (40) pour piles à combustible (10) qui comprend une première et une seconde couches de matériau conducteur mince et poreux tel que du papier en fibres de carbone (44, 50). Ces deux couches comportent entre elles une membrane échangeuse d'ions en polymère non poreux. Lesdites couches, qui couvrent et soutiennent la membrane (43) sur sensiblement toute sa surface, sont revêtues d'un catalyseur (54) d'activation électrochimique et collées à la membrane pour former un ensemble unitaire. Des ouvertures (51, 52, 111, 112, 113, 114) sont formées dans lesdites couches et la membrane pour laisser filtrer des fluides. Des gorges (60, 61) formées dans l'ensemble multicouche entourent les ouvertures sur tout leur pourtour ainsi que la zone électrochimiquement active et reçoivent des joints d'étanchéité pleins préformés (62, 63). Cette technique d'étanchéisation peut aussi être appliquée aux ensembles membrane-étanchéité (40) de la section humidification (30) des piles à combustible (10).

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