Cathode reactant flow field component for a fuel cell stack

H - Electricity – 01 – M

Patent

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H01M 8/02 (2006.01)

Patent

CA 2203015

The reactant flow field on the cathode side of a fuel cell assembly is formed from a plate made from carbon particles that are bonded together by a fluorocarbon polymer binder. The cathode reactant flow field is non-porous, and is hydrophobic due to the presence of the polymer binder. The carbon particles are preferably carbon flakes which pack together very tightly, and require only a minor amount of the polymer binder to form a solid plate. The plate will provide cathode reactant flow channels, will conduct electrons and heat and will minimize acid absorption in a fuel cell stack due to its hydrophobic nature.

Le champ de propagation de réactif situé du côté cathode d'un ensemble de piles à combustible est constitué par une plaque fabriquée en particules de carbone agglomérées au moyen d'un liant polymère de fluorocarbone. Le champ de propagation de réactif de cathode est non poreux et présente un caractère hydrophobe dû à la présence du liant polymère. Ces particules de carbone sont, de préférence, des flocons de carbone qui s'agglomèrent très étroitement et ne nécessitent qu'une quantité mineure de liant polymère pour constituer une plaque pleine. Cette plaque comportera des canaux de propagation de réactif de cathode, sera conductrice d'électrons et de chaleur et limitera l'absorption d'acide dans un ensemble de piles à combustible étant donné son caractère hydrophobe.

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