Fuel cell with constant current idle/stop

H - Electricity – 01 – M

Patent

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H01M 8/04 (2006.01) B60L 11/18 (2006.01)

Patent

CA 2691119

A fuel cell system which prevents the deterioration of the fuel cell stack (1) when feeding of the oxidant gas is paused under a load to perform a fuel conservation operation. Controller (20) shuts down oxidant gas compressor (5) and cooling water circulating pump (7) to execute fuel conservation operation at a low fuel cell system load. The controller (20) gives a current draw instruction to electric power controller (9). In the fuel conservation operation, electric power controller (9) draws a current larger than zero from fuel cell stack (1), and keeps the total charge drawn per unit time constant or substantially constant.

L'invention porte sur un système de piles à combustible qui empêche la détérioration de l'empilement des piles à combustible (1) lorsque l'introduction du gaz oxydant est suspendue sous une charge pour effectuer une opération de conservation du combustible. Un dispositif de commande (20) coupe le compresseur (5) du gaz oxydant et la pompe (7) de circulation d'eau de refroidissement pour exécuter une opération de conservation du combustible à une faible charge du système de piles à combustible. Le dispositif de commande (20) donne une instruction d'appel de courant au dispositif de commande de puissance électrique (9). Dans l'opération de conservation de combustible, le dispositif de commande de puissance électrique (9) appelle un courant supérieur à zéro à partir de l'empilement de piles à combustible (1) et conserve constante ou sensiblement constante la charge totale appelée par unité de temps.

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