Rechargeable electrochemical cell and cell case therefor...

H - Electricity – 01 – M

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H01M 2/12 (2006.01) H01M 2/02 (2006.01) H01M 10/52 (2006.01)

Patent

CA 2215932

A case for a rechargeable electrochemical cell comprises a vent disposed in the case interior, the vent including an oxygen/hydrogen recombination catalyst for catalyzing the recombination of the hydrogen produced by the cell during the recharge mode with oxygen in the case interior to form water in the case interior. The vent comprises a vent support extending inwardly from the cell case shell, a gas permeable, electrolyte impermeable vent cover membrane adjacent the interior surface of the vent support, and a foraminous catalyst support disposed in the case adjacent the interior surface of the vent cover membrane so that the vent cover membrane is sandwiched between the catalyst support and the vent support. Oxygen from the ambient air permeates the vent cover membrane and recombines with the hydrogen in the cell case interior. A rechargeable electrochemical cell comprising the cell case is encompassed and the cell is desirably a metal-air cell.

Boîtier pour pile électrochimique rechargeable, comportant une ouverture aménagée à l'intérieur du boîtier; l'ouverture comprend un catalyseur pour la recombinaison, à l'intérieur du boîtier, de l'hydrogène produit par la pile lors de la recharge, avec l'oxygène pour former de l'eau à l'intérieur du boîtier. L'ouverture comprend un support se projetant vers l'intérieur depuis l'enveloppe du boîtier, une membrane perméable aux gaz et imperméable aux électrolytes, couvrant l'ouverture et adjacente à la surface interne du support, et un support de catalyseur foraminé disposé dans le boîtier à côté de la surface interne de la membrane, de telle façon que celle-ci soit prise en sandwich entre le support du catalyseur et le support de l'ouverture. L'oxygène provenant de l'air ambiant traverse la membrane et se recombine avec l'hydrogène à l'intérieur du boîtier. On présente une pile électrochimique rechargeable comprenant le boîtier, et on privilégie les piles de type métal-air.

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