Electrochemical generator with asymmetric pressure profile

Details Electrochemical generator with asymmetric pressure profile Electrochemical generator with asymmetric pressure profile

H - Electricity

01

M

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

Patent

CA 2505262

The present invention discloses an electrochemical generator fed with reactant gases, and in particular a fuel cell fed with a hydrogen-containing gas and with air at near ambient pressure. The electrochemical generator is characterised by asymmetry of the pressure drops localised in the distributing and collecting channels, wherein, in particular, the pressure drop concentrated in the collecting channels is substantially higher than that concentrated in the distributing channels. Moreover, the pressure in the active areas of the generator substantially coincides with the feeding one. Such a result is obtained by differentiating the design of the distributing channels from the one of the collecting channels, whose passage section is lowered and/or whose length is increased and/or whose amount is decreased.

L'invention concerne un générateur électrochimique alimenté par des gaz réactifs et notamment, une cellule à combustible alimentée par un gaz contenant de l'hydrogène et par de l'air à pression quasi ambiante. Ce générateur électrochimique est caractérisé par l'asymétrie des baisses de pression localisées dans les canaux distributeurs et collecteurs. Notamment, la baisse de pression concentrée dans les canaux collecteurs est sensiblement plus importante que la baisse de pression concentrée dans les canaux distributeurs. De plus, la pression des zones actives du générateur coïncide sensiblement avec la pression de la zone d'alimentation. Pour obtenir ce résultat, on différencie la conception des canaux distributeurs de la conception des canaux collecteurs, dont la section de passage est diminuée et/ou dont la longueur est augmentée et/ou dont la quantité est réduite.

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