Bipolar unit for fuel cell provided with porous current...

H - Electricity – 01 – M

Patent

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H01M 8/02 (2006.01)

Patent

CA 2677576

The invention describes a bipolar unit consisting of a pair of metal plates at least one of which is corrugated, fixed by continuous and hydraulically impervious connections, and provided on the external surfaces thereof with porous electric current collectors also suitable for the distribution of the gaseous reactants. The collector facing the plate corrugations is interpenetrated therein, thereby achieving a continuous contact. Two bipolar units of the invention and one interposed MEA element are assembled to form an elementary fuel cell with an improved electric current distribution. Furthermore the channels formed between the mutually contacting surfaces of the plate pair by the corrugations of at least one of the plates of each bipolar unit, are crossed by a coolant allowing to optimally adjust the cell operative temperature.

L'invention concerne une unité bipolaire constituée par une paire de plaques métalliques, au moins une des plaques étant ondulée, fixées par des raccords continus et hydrauliquement étanches et disposées sur les surfaces externes de l'unité, des collecteurs de courant électrique poreux permettant la distribution des réactifs gazeux. Le collecteur qui fait face aux cannelures de la plaque est imbriqué dans celle-ci, ce qui permet d'obtenir un contact continu. Deux unités bipolaires selon l'invention et un élément MEA interposé sont assemblés de sorte à former une pile à combustible élémentaire présentant une distribution de courant électrique améliorée. En outre, les canaux formés entre les surfaces en contact mutuel de la paire de plaques par les cannelures d'au moins une des plaques de chaque unité bipolaire sont traversés par un frigorigène permettant la régulation optimale de la température de fonctionnement de la pile.

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