Improved drying method for fuel cell stacks

H - Electricity – 01 – M

Patent

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H01M 8/04 (2006.01)

Patent

CA 2598481

For various reasons, it can be desirable to subject fuel cells to drying procedures. In solid polymer electrolyte fuel cells for instance, drying may be carried out prior to storing at below freezing temperatures, or to recover cell performance lost following freeze/thaw events. An improved drying method involves drying the cell uniformly throughout. That is, the drying power over the length of the fuel cell is adjusted to be essentially uniform. This can be accomplished by using an appropriate set of operating conditions. The improved drying method can improve the lifetime of the fuel cell.

Pour diverses raisons, il peut être souhaitable de soumettre des piles à combustible à des procédures de séchage. Dans les piles à combustible solides à électrolyte polymère, par exemple, le séchage peut être effectué avant le stockage à des températures en dessous de zéro, ou en vue de restaurer les performances de la pile perdues suite à des phénomènes de givrage/dégivrage. Un procédé de séchage amélioré permet de sécher la pile complètement et de manière uniforme. Autrement dit, la puissance de séchage sur toute la longueur de la pile à combustible est ajustée de manière à être sensiblement uniforme. Ceci peut être réalisé en utilisant un ensemble approprié de conditions de fonctionnement. Ce procédé de séchage amélioré peut prolonger la durée de vie de la pile à combustible.

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