Fuel cell separator and production method therefor

Details Fuel cell separator and production method therefor Fuel cell separator and production method therefor

H - Electricity

01

M

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

Patent

CA 2395413

According to the invention, in a separator (4) for a fuel cell which is produced by: loading a complex compound that is configured by bonding graphite powder by means of a thermosetting resin, into a mold (14); and forming ribs (11) for forming gas passages by the resin molding process, the surfaces of the ribs (11) are etched by an alkaline solution or alkali--treated, a surface resin layer which is formed on the surface of the separator (4) is removed away, and graphite particles showing a plate-like form are exposed from the surfaces of the ribs (11) which function as a contact surface with an electrode, whereby the contact resistance with an electrode is remarkably lowered, so that the performance and efficiency of the fuel cell can be improved.

La surface d'une partie saillante (11) formant un passage d'écoulement de gaz, d'un séparateur (4) d'élément à combustible - partie saillante (11) que l'on forme en remplissant un moule d'un composite produit par la liaison d'une poudre de graphite avec une résine thermodurcissable, par un procédé de moulage de résine - est gravée à l'aide d'une solution alcaline ou est traitée à l'alcali, de manière qu'une pellicule de résine en couche mince formée sur la surface du séparateur (4) soit enlevée et que les particules de graphite en plaques se trouvant sur la partie saillante (11) formant une surface de contact avec une électrode soient exposées. On réduit ainsi la résistance de contact de la surface de contact avec l'électrode et on augmente les performance et l'efficacité de l'élément à combustible.

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