Fuel cell system with improved reaction gas utilization

Details Fuel cell system with improved reaction gas utilization Fuel cell system with improved reaction gas utilization

H - Electricity

01

M

H01M 8/02 (2006.01) H01M 8/10 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2422052

The invention relates to a fuel cell unit with a fuel cell stack with improved reaction gas utilisation by means of variable mass transfer coefficients within the stack. The reaction gas utilisation is optimised by means of matching and shaping of the process gas stream distribution channels, such that the laminar flow in the smooth channels is turned into a turbulent flow and thus an increase in the mass transfer coefficient .beta. in the back end of the stack occurs. According to a preferred embodiment, pole plates, tripping edges and deflectors are provided in the distribution channels, by means of which the main direction of flow may be diverted to the active cell surfaces.

La présente invention concerne une installation de piles à combustible comprenant un empilement de piles à combustible et assurant une meilleure exploitation du gaz de réaction, au moyen de coefficients de transfert de masse variables à l'intérieur de cet empilement. L'exploitation du gaz de réaction est optimisée grâce à l'adaptation et à l'organisation des canaux de distribution du flux de gaz de processus, de façon que l'écoulement laminaire des canaux lisses soit transformé en un écoulement turbulent, ce qui résulte en une augmentation des coefficients de transfert de masse .beta. dans la zone arrière de l'empilement. Dans un mode de réalisation préféré de la présente invention, des bords de butée et des systèmes de déviation sont pourvus dans les canaux de distribution des plaques polaires et permettent de dévier la direction principale d'écoulement sur la surface active des piles.

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