Sealing structure for fuel cell

H - Electricity – 01 – M

Patent

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Details

H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2631439

An anode (11a) and a cathode (11b) are provided on either side of an electrolyte membrane (11). A first separator (2) is disposed so as to face the anode (11a), and a second separator (3) is disposed so as to face the cathode (11b). A first sealing member (12) is disposed between the electrolyte membrane (11) and the first separator (2), and a second sealing member (13) is disposed between the electrolyte membrane (11) and the second separator (3). The cross-sectional shape or rubber hardness of the sealing members (12, 13) is varied according to a deformation amount generated in the electrolyte membrane (11) by a sealing reactive force. More specifically, in a site where the deformation amount of the electrolyte membrane (11) is large, either the contact area between the sealing member (12) and the electrolyte membrane (11) is increased, or the rubber hardness of the sealing member (12) is reduced. In so doing, deformation of the electrolyte membrane (11) caused by the sealing reactive force is suppressed, and the sealing performance of a fuel cell (10) is improved.

Dans la structure selon la présente invention, une anode (11a) et une cathode (11b) sont disposées de part et d'autre d'une pellicule d'électrolyte (11). Un premier séparateur (2) est disposé de façon à faire face à l~anode (11a), et un second séparateur (3) est disposé de façon à faire face à la cathode (11b). Un premier matériau d~étanchéification (12) est disposé entre la pellicule d~électrolyte (11) et le premier séparateur (2), et un second matériau d~étanchéification (13) est disposé entre la pellicule d~électrolyte (11) et le second séparateur (3). Les matériaux d'étanchéification (12, 13) modifient leur forme de section transversale ou leur dureté du caoutchouc, en fonction de la quantité par laquelle la pellicule d'électrolyte (11) est déformée par une force réactive d'étanchéification. Spécifiquement, la déformation de la pellicule d'électrolyte (11) causée par la force réactive d'étanchéification est supprimée et la performance d'étanchéification de la pile à combustible (10) est améliorée en augmentant l~aire de contact du matériau d~étanchéification (12) avec la pellicule d~électrolyte (11) ou en réduisant la dureté du caoutchouc du matériau d~étanchéification (12), au niveau d~une partie de la pellicule d~électrolyte (11) où la quantité de déformation est élevée.

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