Current interrupter for electrochemical cells

H - Electricity – 01 – M

Patent

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Details

H01M 2/12 (2006.01) H01M 2/34 (2006.01) H01H 35/34 (2006.01) H01H 37/54 (2006.01) H01H 37/76 (2006.01)

Patent

CA 2251100

A current interrupt mechanism for electrochemical cells is disclosed. A thermally activated current interrupt mechanism (38) is integrated into an end cap assembly (10) for an electrochemical cell. The thermally responsive mechanism preferably includes a free floating bimetallic disk (40) or a meltable mass of material (175) to break an electrical pathway within the end cap assembly. The end cap assembly also includes integrated therein a pressure responsive current interrupt mechanism (48). The pressure responsive mechanism activates to sever electrical contact between a diaphragm (70) and a plate (80) within the end cap assembly (10) to prevent current from passing through the cell, and may include a diaphragm (70) which ruptures when there is extreme gas pressure buildup.

L'invention concerne un mécanisme d'interruption de courant pour cellules électrochimiques. Un mécanisme d'interruption de courant (38) activé par la chaleur est intégré à un ensemble bouchon d'extrémité (10) de cellule électrochimique. Le mécanisme sensible à la chaleur comporte de préférence un disque bimétallique à flottement libre (40) ou une masse fusible de matériau (175) pour interrompre un trajet électrique à l'intérieur de l'ensemble bouchon d'extrémité. L'ensemble bouchon d'extrémité comporte également un mécanisme d'interruption de courant (48) intégré sensible à la pression. Le mécanisme sensible à la pression est activé pour couper le contact électrique entre une membrane (70) et une plaque (80) placées à l'intérieur de l'ensemble bouchon d'extrémité pour empêcher le courant de passer dans la cellule, et peut comporter une membrane (70) qui rompt en cas d'accumulation de pression de gaz excessive.

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