Electrolyte membrane-electrode assembly, fuel cell using the...

H - Electricity – 01 – M

Patent

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Details

H01M 4/86 (2006.01) D01F 9/12 (2006.01) D03D 15/00 (2006.01) D03D 15/12 (2006.01) H01M 4/88 (2006.01) H01M 4/92 (2006.01) H01M 4/96 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2480342

By using a gas diffusion layer for a fuel cell comprising a fabric comprising a warp thread and a weft thread which are made of carbon fiber, wherein the distance X between adjacent intersections where the warp and weft threads cross each other and the thickness Y of the fabric satisfy the equation: 1.4 .ltorsim. X/Y .ltorsim. 3.5, the present invention reduces the surface asperities of the substrate and prevents a micro short-circuit resulting from the piercing of the polymer electrolyte membrane of the fuel cell by the carbon fibers of the fabric so as to improve the characteristics of the fuel cell. In order to further prevent the piercing of the polymer electrolyte membrane by the carbon fibers of the gas diffusion layer substrate, the rough surface of the carbon fabric is smoothed by:(1) applying a clamping pressure of 1 to 20 kgf/cm2 to the contact area between each electrode and each conductive separator plate of the fuel cell; or (2) heating the gas diffusion layer surface before the gas diffusion layer is disposed onto the polymer electrolyte membrane.

L'invention concerne une couche de diffusion de gaz pour pile à combustible, comprenant un tissu constitué de fils de chaîne et de trame en fibre de carbone, l'espacement (X) entre les points de texture voisins au niveau desquels les fils de chaîne et de trame se croisent et l'épaisseur du tissu (Y) satisfaisant à la formule 1,4<=X/Y<=3,5. Cela permet de réduire l'irrégularité de la surface du substrat et d'inhiber les courts-circuits attribués à l'adhérence des fibres de carbone du tissu au film électrolytique polymère de la pile à combustible, et d'augmenter ainsi la qualité de fonctionnement de la pile à combustible. Pour accroître encore l'inhibition de l'adhérence des fibres de carbone du substrat de diffusion de gaz au film électrolytique polymère, (1) une pression de fixation comprise entre 1 à 20 kgf/cm?2¿ par zone de contact entre l'électrode individuelle et la plaque séparatrice conductrice individuelle est appliquée sur la pile à combustible, ou (2) avant de disposer la couche de diffusion de gaz sur le film électrolytique polymère, la surface de la couche de diffusion de gaz est chauffée, de sorte que la surface irrégulière des fibres de carbone soit lissée.

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