Current interrupter for electrochemical cells

H - Electricity – 01 – M

Patent

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Details

H01M 2/34 (2006.01) H01H 37/32 (2006.01) H01H 35/34 (2006.01) H01H 37/54 (2006.01)

Patent

CA 2301085

A current interrupter assembly (220) for electrochemical cells (215) may be self-contained, sealed unit which may be separately inserted into the cell during cell construction. The current interrupter assembly (220) has particular utility for thin rechargeable cells and when inserted in the cell forms a portion of the electrical pathway between a cell electrode (211) and corresponding terminal (245). The current interrupt mechanism comprises a thin thermally responsive member preferably comprising a disk (250) of a shape memory metal alloy having a curved surface. When cell temperature exceeds a predetermined value the disk deflects to cause a break in the electrical pathway within the assembly.

Cet ensemble rupteur de courant (220), destiné à des piles électrochimiques (215), peut être une unité autonome, scellée, pouvant être insérée séparément dans la pile lors de la construction de celle-ci, il est particulièrement utile pour des piles rechargeables minces et, lorsqu'il est inséré dans la pile, il forme une portion du trajet électrique entre une électrode (211) de la pile et une borne correspondante (245). Ce mécanisme d'interruption du courant comprend un élément mince, sensible à la chaleur, comportant préférablement un disque (250) en alliage métallique à mémoire de forme, présentant une surface courbe. Lorsque la température de la pile excède une valeur déterminée, ce disque se déforme pour provoquer une coupure dans le trajet électrique de l'ensemble.

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