Improved conductivity fuel cell collector plate and method...

H - Electricity – 01 – M

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Details

H01M 2/20 (2006.01) H01M 2/16 (2006.01) H01M 8/02 (2006.01)

Patent

CA 2379344

An improved method of manufacturing a PEM fuel cell collector plate is disclosed. During molding, a highly con- ductive polymer composite is formed having a relatively high polymer concentration along its external surfaces. After molding, the polymer rich layer (5) is removed from the land areas by machining, grinding or similar process. This layer removal leaves the land areas at a reduced height (6), and results in increased overall conductivity of the molded collector plate. The polymer rich surface remains in the collector plate channels (7), providing increased mechanical strength and other benefits to the channels (7), while the land areas have a concentration similar to the bulk (8) of the collector plate. The improved method also permits greater mold cavity thickness providing a number of advantages during the molding process.

Cette invention se rapporte à un procédé amélioré de fabrication d'une plaque collectrice de pile à combustible de type PEM. Durant le moulage, on forme un composite polymère fortement conducteur, présentant une concentration de polymère relativement élevée le long de ses surfaces externes. Après le moulage, la couche riche en polymère (5) est retirée des zones plates par usinage, rectification ou toute autre opération similaire. La couche ainsi retirée laisse les zones plates à une hauteur réduite (6), ce qui entraîne une conductivité globale accrue de la plaque collectrice ainsi moulée. La surface riche en polymère reste dans les canaux (7) de la plaque collectrice, conférant à ces canaux (7) une plus grande résistance mécanique et d'autres améliorations, tandis que les zones plates ont une concentration similaire à la masse (8) de la plaque collectrice. Ce procédé amélioré permet également de prévoir une plus grande épaisseur pour la cavité du moule, ce qui entraîne un certain nombre d'avantages pendant l'opération de moulage.

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