Fuel cell with gas separator which discharges retained water

Details Fuel cell with gas separator which discharges retained water Fuel cell with gas separator which discharges retained water

H - Electricity

01

M

H01M 8/02 (2006.01) H01M 2/14 (2006.01) H01M 8/04 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2540773

An oxygen-containing gas flow field is formed on a surface of a first metal separator. The oxygen-containing gas flow field is connected between an oxygen-containing gas supply passage and an oxygen-containing gas discharge passage. The oxygen-containing gas flow field comprises oxygen-containing gas flow grooves, and ends of the oxygen-containing gas flow grooves are extended outwardly beyond ends of electrode catalyst layer of a membrane electrode assembly, and connected to an inlet buffer and an outlet buffer. When the purging process is performed at the time of stopping operation of the fuel cell, the purging air supplied to the oxygen-containing gas flow field discharges water retained in the electrode catalyst layers from the ends to the outlet buffer.

Un champ de propagation de gaz contenant de l'oxygène est formé à la surface d'un premier séparateur de métaux. Le champ de propagation de gaz contenant de l'oxygène relie un conduit d'alimentation en gaz contenant de l'oxygène et un conduit d'évacuation du gaz contenant de l'oxygène. Le champ de propagation de gaz contenant de l'oxygène comporte des sillons, et les extrémités de ces sillons s'étendent vers l'extérieur plus loin que les extrémités de la couche de catalyseur de l'électrode d'une électrode à membrane, et sont reliés à un tampon d'entrée et à un tampon de sortie. Lorsque le processus de purge est effectué à l'arrêt de la pile à combustible, l'air de purge acheminé dans le champ de propagation de gaz contenant de l'oxygène déverse l'eau retenue dans les couches de catalyseur de l'électrode à partir des extrémités vers le tampon de sortie.

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