Fuel cell

H - Electricity – 01 – M

Patent

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Details

H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2523988

An assembling operation of a fuel cell is effectively simplified. With the simple and economical structure, the desired sealing function is achieved. The fuel cell includes a membrane electrode assembly and first and second metal separators sandwiching the membrane electrode assembly. Connection channels are provided on the first metal separator. The connection channels connect the oxygen-containing gas supply passage and the oxygen-containing gas discharge passage to the oxygen-containing gas flow field. The membrane electrode assembly has first overlapping portions overlapped on the connection channels for sealing the connection channels. The first overlapping portions comprise, in effect, a gas diffusion layer.

L'invention concerne un processus d'assemblage d'une pile à combustible, qui est efficacement simplifié; sa structure simple et économique assure une fonction d'étanchéité désirée. Une structure à électrolyte membrane / électrode (14) d'une pile à combustible (10) est disposée entre un premier et un deuxième séparateurs en métal (16, 18). Le premier séparateur en métal (16) comprend des passages de connexion (28a, 28b) destinés à assurer la communication entre un trou de communication d'entrée de gaz oxydant (20a) et un passage de gaz oxydant (26) ainsi qu'entre trou de communication d'entrée de gaz oxydant (20b) et un passage de gaz oxydant (26). La structure à électrolyte (14) comprend de premières parties chevauchantes (66a, 66b) destinées à assurer l'étanchéité de passages de connexion (28a, 28b) de manière à ce que les parties chevauchantes se superposent sur le passage de connexion. Les premières parties chevauchantes (66a, 66b) sont sensiblement constituées d'une couche de diffusion de gaz.

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