Fuel cell separator

Details Fuel cell separator Fuel cell separator

H - Electricity

01

M

H01M 8/02 (2006.01) H01M 2/16 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2395422

According to the invention, in a separator molded member (4A) 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 (16); and forming ribs (11) for forming gas passages by the resin molding process, the surfaces of the ribs (11) are alkali-treated by, for example, etching by using an alkaline solution, and graphite particles (14) which are flat and soft are exposed from the top surfaces of the ribs (11) which function as a contact surface with an electrode in the separator molded member (4A), and resin defective portions (15) are formed between adjacent graphite particles (14), whereby the contact area with an electrode is enlarged, so that the performance and efficiency of the fuel cell can be improved by remarkable lowering of the contact resistance.

Un moulage (4A) de séparateur pour pile à combustible possède une zone à nervures (11) formant un chemin d'écoulement de gaz. La zone à nervures (11) est formée par remplissage d'un composé composite obtenu par liaison de poudre de graphite et de résine thermodurcissable dans un moule (14) selon un procédé de moulage de résine. La surface de la zone à nervures est traitée de manière alcaline par attaque à l'aide d'une solution alcaline pour mettre à nu des particules de graphite (14) plates et molles situées au niveau de la surface terminale de la zone à nervures (11) agissant comme surface de contact avec une électrode dans le moulage (4A) de séparateur, et pour former des parties (15) déficitaires en résine entre des particules de graphite (14) adjacentes. Une zone de contact avec l'électrode est agrandie, avec réduction significative de la résistance de contact, ce qui améliore les performances et l'efficacité de ladite pile à combustible.

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