Fuel cell system having oxidizing gas supply control device

Details Fuel cell system having oxidizing gas supply control device Fuel cell system having oxidizing gas supply control device

H - Electricity

01

M

H01M 8/04 (2006.01) H01M 8/00 (2006.01)

Patent

CA 2673062

When a request power for a fuel cell is smaller than a predetermined value, a fuel cell system stops supply of oxygen gas to a fuel cell and lowers the output voltage of the fuel cell from a user upper limit voltage (V1) to a reduction voltage (V3) so as to activate a catalyst. When the output voltage of the fuel cell is lowered to an air blow voltage (V4) because of insufficient oxygen gas, the fuel cell system supplies oxygen gas to recover the output voltage of the fuel cell.

Selon la présente invention, lorsqu'une puissance demandée pour une pile à combustible est inférieure à une valeur prédéterminée, un système de pile à combustible interrompt l'alimentation en oxygène gazeux vers une pile à combustible et baisse la tension de sortie de la pile depuis une tension de limite supérieure d'utilisateur (V1) vers une tension de réduction (V3) de façon à activer un catalyseur. Lorsque la tension de sortie de la pile à combustible est baissée à une tension de soufflage d'air (V4) en raison d'une insuffisance en oxygène gazeux, ledit système fournit l'oxygène gazeux pour retrouver la tension de sortie de ladite pile.

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