Bipolar plate having offsets

H - Electricity – 01 – M

Patent

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Details

H01M 8/02 (2006.01)

Patent

CA 2578265

A bipolar plate (70) for a PEM fuel cell is disclosed. The plate includes a plurality of channels (62), wherein the ends of the channels are staggered. The plate also includes a plurality of tunnels (88), wherein the ends of the tunnels are staggered. The plate further includes a cathode and an anode, wherein a portion of the cathode overhangs a portion of the anode. These staggered/offset features allow for an increase the capillary meniscus of water droplets passing therethrough, allowing for a reduction in the pressure required to move the water through the cell and out to the header volume of the stack.

L'invention concerne une plaque bipolaire destinée à une pile à combustible PEM. La plaque comprend une pluralité de canaux dont les extrémités sont décalées. La plaque comprend également une pluralité de tunnels dont les extrémités sont décalées. La plaque comprend également une cathode et une anode, une partie de la cathode étant en porte-à-faux par rapport à une partie de l'anode. Ces caractéristiques décalées permettent d'augmenter le ménisque capillaire de gouttelettes d'eau passant dans celui-ci, de manière à réduire la pression nécessaire pour déplacer l'eau dans la pile et hors du volume en charge de l'empilement.

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