Shutdown methods and designs for fuel cell stacks

Details Shutdown methods and designs for fuel cell stacks Shutdown methods and designs for fuel cell stacks

H - Electricity

01

M

H01M 8/04 (2006.01)

Patent

CA 2597461

Improved water distribution can be obtained within the cells of a fuel cell series stack by maintaining a suitable temperature difference between the cathode and anode sides of each cell in the stack during shutdown. This can be accomplished by thermally insulating the ~hot~ end and sides of the stack and by providing a thermal mass adjacent to the ~hot~ end. The fuel cell stack may also comprise first and second end plates, the second end plate having a heat rejection surface; a thermal mass interposed between the first end plate and the end cell and in thermal communication with the end cell; a first insulating layer interposed between the first end plate and the thermal mass; and a second insulating layer surrounding the plurality of fuel cells.

L'invention concerne une distribution d'eau améliorée pouvant être obtenue dans les piles à combustible d'un assemblage en série, grâce au maintien d'une différence de température adéquate entre les côtés cathode et anode de chaque pile à combustible dans l'assemblage pendant l'arrêt. Un tel résultat est obtenu grâce à l'isolation thermique de l'extrémité chaude et des côtés de l'assemblage et grâce à l'utilisation d'une masse thermique à côté de l'extrémité chaude .

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