A fuel cell separator and a method for producing the same

Details A fuel cell separator and a method for producing the same A fuel cell separator and a method for producing the same

H - Electricity

01

M

H01M 8/00 (2006.01) H01M 8/02 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2303212

A separator for a fuel cell, which can maintain low contact resistance for a long time of service in an oxidative vapor atmosphere. This separator (20) is provided by forming a large number of Sn or Sn-alloy projections (24) on the surface of a separator plate (22) opposed to electrodes (14, 16). Preferably, the projections (22) are formed of an Sn-Bi alloy or Sn-Bi alloy doped with Ag. The separator is manufactured by applying molten metal (32) of Sn or an Sn alloy on the separator plate (22), and pressing a die (34) with a large number of small holes (34a) against the molten metal (32) so that the molten metal (32) may enter the space defined by the plate (22) and the small holes (34a).

L'invention concerne un séparateur pour pile à combustible, qui permet de maintenir une faible résistance de contact pendant une longue durée d'utilisation dans une atmosphère de vapeur oxydante. Ce séparateur (20) est fabriqué comme suit: formation d'un grand nombre de protubérances en étain ou en alliage d'étain (24) à la surface d'un plaque séparatrice (22) opposée aux électrodes (14, 16). De préférence, les protubérances (22) sont en alliage étain-bismuth ou en alliage étain-bismuth dopé à l'argent. On applique du métal fondu (32), à savoir étain ou alliage d'étain, sur la plaque séparatrice (22), et on appuie une matrice (34) comportant un grand nombre de trous de petite taille (34a) contre ledit métal fondu (32), de sorte que ce métal (32) puisse entrer dans l'espace défini par la plaque (22) et les trous de petite taille (34a).

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