Assemblies for electrochemical devices

H - Electricity – 01 – M

Patent

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Details

H01M 8/02 (2006.01) H01M 2/14 (2006.01) H01M 4/86 (2006.01)

Patent

CA 2656118

MEA 7-layer assemblies with gasket, comprising: - a film of ionomeric membrane (3), containing functional acid groups -SO3H and/or -COOH, having in at least one direction, called direction x, a size variation lower than 0.08%; - two GDL sheets (1) and (2) in porous material having on one surface an electrocatalytic layer, not shown in the Figures, of which: - the first sheet DGL (1) is coextensive with the membrane (3) surface, positioned so as to overlap thereto; - the second sheet GDL (2), having a lower width but the same length of the film of membrane (3), measured in the x direction; - the two sheets (1) and (2) placed so that the electrocatalytic layer comes into contact, respectively, with each of the two membrane faces; - a gasket positioned according to a frame shape along the assembly perimeter.

L'invention concerne des ensembles membrane/électrode à sept couches dotés d'une garniture d'étanchéité. Ces ensembles comprennent : un film de membrane ionométrique (3) contenant des groupes acides fonctionnels -SO3H et/ou -COOH présentant au moins une direction, appelée direction x, une variation de taille inférieure à 0, 08 %; deux feuilles à couche de diffusion de gaz (GDL) (1) et (2) en matière poreuse présentant, sur une surface, une couche catalytique, la première feuille GD L étant coextensive avec la surface membranaire (3) et positionnée de sorte à chevaucher cette dernière; la seconde feuille GDL présentant une largeur inférieure à celle du film membranaire (3), mais la même longueur que celle du film membranaire (3) mesurée dans la direction x; les deux feuilles (1) et (2) étant placées de sorte que la couche électrocatalytique vienne en contact, respectivement, avec chaque face membranaire; une garniture d'étanchéité étant placée selon une forme d'ossature, le long du périmètre de l'ensemble.

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