Method and apparatus for regulating charging of...

H - Electricity – 01 – M

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H01M 2/34 (2006.01) H01M 10/44 (2006.01) H01M 10/48 (2006.01) H01M 2/02 (2006.01) H01M 2/12 (2006.01) H01M 6/50 (2006.01) H01M 10/34 (2006.01)

Patent

CA 2426426

A rechargeable electrochemical cell is provided having a pressure-responsive apparatus for determining a charge termination point. In particular, a reversible pressure-responsive switch may be disposed in a cap at the open end of a rechargeable metal hydride cell. The reversible pressure-responsive switch may also contain a vent system for releasing the cell internal pressure. Alternatively, a rechargeable cell may include a strain gauge disposed in its outer surface whose resistance changes as the outer surface of the battery expands due to internal pressure accumulation during charging. Additionally, a rechargeable cell is used combination with a charging source that can supply constant voltage, constant current, alternating current, or voltage that varies between a minimum threshold and a maximum threshold.

L'invention concerne une cellule électrochimique présentant un appareil agissant en réponse à la pression pour déterminer un point de fin de charge. En particulier, un commutateur réversible agissant en réponse à la pression peut être placé dans un couvercle au niveau de l'extrémité ouverte d'une cellule d'hydrure de métal rechargeable. Ce commutateur réversible agissant en réponse à la pression peut également posséder un système d'évent pour libérer la pression interne de la cellule. Par ailleurs, une cellule rechargeable peut comprendre un tensiomètre placé dans sa surface extérieure dont la résistance change lors de la dilatation de la surface extérieure de la batterie en raison d'une accumulation de pression interne pendant le chargement. En outre, une cellule rechargeable est utilisée en association avec une source de chargement qui peut fournir une tension constante, un courant constant, un courant alternatif, ou une tension qui varie entre un seuil minimal et un seuil maximal.

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