Electrochemical fuel cell employing ambient air as the...

H - Electricity – 01 – M

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H01M 8/04 (2006.01) H01M 8/02 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2179034

An electrochemical fuel cell assembly includes a membrane electrode assembly which comprises an anode, a cathode having a surface thereof exposed to ambient air, and an ion exchange membrane interposed between the anode and the cathode. A seal forms a gas-impermeable barrier around the anode to which a gaseous fuel stream is supplied. The assembly further includes a thermally conductive plate having a plurality of thermally conductive members of fins extending from a major surface of the plate. The thermally conductive members contact portions of the exposed cathode surface. Adjacent thermally conductive members cooperate with the plate and the exposed cathode surface to form air conducting channels. Heat generated exothermically in the membrane electrode assembly is dissipated to the atmosphere through the thermally conductive members.

Un ensemble cellule électrochimique comprend un ensemble à électrodes et à membrane constitué d'une anode, d'une cathode dont une surface est exposée à l'air ambiant, et d'une membrane d'échange d'ions placée entre ladite anode et ladite cathode. Un joint forme une barrière imperméable au gaz qui entoure l'anode à laquelle est amené un courant de combustible gazeux. L'ensemble cellule électrochimique comprend également une plaque thermoconductrice pourvue d'une pluralité d'éléments ou d'ailettes thermoconducteurs s'étendant à partir d'une surface importante de la plaque. Les éléments thermoconducteurs sont en contact avec des parties de la surface de la cathode exposée à l'air ambiant. Des éléments thermoconducteurs adjacents coopèrent avec la plaque et la surface de la cathode exposée à l'air ambiant pour former des canaux conduisant l'air. La chaleur produite par une réaction exothermique dans l'ensemble à électrodes et à membrane est dissipée dans l'atmosphère par l'intermédiaire des éléments thermoconducteurs.

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