Current interrupter for electrochemical cells

H - Electricity – 01 – M

Patent

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Details

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

Patent

CA 2250304

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 (fig. 4, 175) to break an electrical pathway within the end cap assembly. The end cap assembly may also include integrated therein a pressure responsive current interrupt mechanism (48). The pressure responsive mechanism activates to sever an electrical pathway within the end cap assembly (10) to prevent current from passing through the cell, and includes 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 (fig. 4, 175) pour l'interruption d'un trajet électrique à l'intérieur de l'ensemble bouchon d'extrémité. L'ensemble bouchon d'extrémité peut également comporter un mécanisme d'interruption de courant intégré (48) sensible à la pression qui s'active pour couper un trajet électrique à l'intérieur de l'ensemble bouchon d'extrémité (10) et empêcher le courant de passer dans la cellule, et qui comporte une membrane (70) qui se rompt en cas d'accumulation de pression gazeuse extrême.

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