Fuel cell system and method for influencing the thermal and...

H - Electricity – 01 – M

Patent

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H01M 8/04 (2006.01)

Patent

CA 2662003

The invention relates to a fuel cell system having a fuel cell stack (10), an afterburner (12) for burning off gas emerging from the fuel cell stack, and a heat exchanger (16) which is arranged in an off-gas passage (14) from the afterburner and in which cathode supply air (18) to be supplied to the fuel cell stack can be heated. The invention provides for the capability to supply cathode supply air (20) to the fuel cell stack (10) without previously having been heated in the heat exchanger (16), and for the capability to use the total amount of cathode supply air supplied as well as the ratio of the component of the cathode supply air (18, 20) that has been heated in the heat exchanger and of that which has not been heated in the heat exchanger to influence the thermal and temperature budget of the fuel cell stack (10). The invention also relates to a method for influencing the thermal and temperature budget of a fuel cell stack.

L'invention concerne un système de piles à combustible comprenant un empilement de piles (10) à combustible, un post-brûleur (12) pour brûler les gaz d'échappement qui sortent de l'empilement de piles à combustible et un échangeur (16) thermique disposé dans un conduit (14) de gaz d'échappement du post-brûleur et dans lequel peut être chauffé l'air (18) d'arrivée de cathode acheminé à l'empilement de piles à combustible. Conformément à l'invention, il est prévu que l'air (20) d'arrivée de cathode puisse être acheminé à l'empilement de piles (10) à combustible sans chauffage préalable dans l'échangeur (16) thermique et que le potentiel thermique et de température de l'empilement de piles (10) à combustible puisse être influencé par la quantité totale d'air d'arrivée de cathode acheminé ainsi que par le rapport entre la proportion d'air (18, 20) d'arrivée de cathode chauffé dans l'échangeur thermique et celle (18, 20) non chauffé dans l'échangeur thermique. L'invention concerne en plus un procédé pour influencer le potentiel thermique et de température d'un empilement de piles à combustible.

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