Fuel cell stack with thermal insulating portions

H - Electricity – 01 – M

Patent

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Details

H01M 8/24 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2700901

There is disclosed a fuel cell in which an insulating material is disposed, whereby the thermal diffusion of the inside and outside of a fuel cell can be suppressed to suppress the deterioration of the performance of the fuel cell due to a temperature drop. Moreover, the physical properties of the insulating material are specified, whereby appropriate insulating properties required in the fuel cell can be obtained, and startup properties are improved. A fuel cell 1 has a cell stack 10 in which a plurality of unit cells are stacked, and terminal plates 14A and 14B disposed on both sides of the cell stack 10 in a cell stack direction thereof. The fuel cell comprises an insulating portion 24 having an insulating material 21 and holding plates 22 and 23 which hold the insulating material 21 from both the sides of the insulating material in the cell stack direction, the insulating material 21 is held between the holding plates 22 and 23, and the insulating material 21 has a thermal conductivity of 0.1 W/mK or less and a porosity of ~ or more.

L'invention concerne une pile à combustible. Selon l'invention, un élément isolant est disposé pour supprimer la diffusion thermique entre l'intérieur et l'extérieur de la pile à combustible et supprimer ainsi la dégradation de ses performances sous l'effet d'une chute de la température et les propriétés physiques de l'élément isolant sont spécifiées pour procurer une isolation appropriée de la pile à combustible et améliorer ainsi l'aptitude au démarrage. La pile à combustible (1) contient un stratifié de cellules (10) contenant une pluralité de cellules unitaires stratifiées, et des plaques collectrices (14A et 14B) disposées sur les deux côtés du stratifié de cellules (10) dans le sens de stratification des cellules. La pile à combustible contient en outre un module d'isolation (24), contenant un élément isolant (21) et des plaques de serrage (22 et 23) pour serrer l'élément isolant (21) sur les deux côtés du stratifié dans le sens de la stratification des cellules, de telle sorte que l'élément isolant (21) est serré entre les plaques de serrage (22 et 23). L'élément isolant (21) présente une conductibilité thermique de 0,1 W/mK et une porosité égale ou supérieure à 70 %.

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