Fuel cell system and method for starting a fuel cell system

H - Electricity – 01 – M

Patent

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Details

H01M 8/04 (2006.01) H01M 8/06 (2006.01)

Patent

CA 2662378

The invention relates to a method for starting a fuel cell system comprising a reformer (10) and a fuel cell stack (12). Oxygen and fuel having a first air ratio .lambda.1 characterising the fuel-air ratio are supplied to the reformer during a first start phase. Oxygen and fuel having a second air ratio .lambda.2 characterising the fuel-air ratio are supplied to the reformer during a second start phase. The first air ratio .lambda.1 is greater than the second air ratio .lambda.2 (.lambda.1 > .lambda.2) and reformate (18) produced during the first and the second start phase is supplied to the fuel cell stack. According to the invention, the transition from the first start phase to the second start phase is monitored by the detection of a electrical voltage supplied by the fuel cell stack. The invention also relates to a fuel cell system.

L'invention concerne un procédé permettant de mettre en marche un système de piles à combustible comprenant un reformeur (10) et un empilement de piles à combustible (12). De l'oxygène et du combustible présentant un premier coefficient d'air lambda .lambda.1 caractérisant le rapport combustible/air sont acheminés jusqu'au reformeur au cours d'une première phase de mise en marche. De l'oxygène et du combustible présentant un second coefficient d'air lambda .lambda.2 caractérisant un second rapport combustible/air sont acheminés jusqu'au reformeur au cours d'une seconde phase de mise en marche. Le premier coefficient d'air lambda .lambda.1 est supérieur au second coefficient d'air lambda .lambda.2 (.lambda.1>.lambda.2). Le reformat (18) produit dans le reformeur est acheminé jusqu'à l'empilement de piles à combustible au cours de la première et de la seconde phase de mise en marche. Selon l'invention, il est prévu que le passage de la première à la seconde phase de mise en marche soit contrôlé par détection d'une tension électrique fournie par l'empilement de piles à combustible (12). L'invention concerne en outre un système de piles à combustible.

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