Overcharge protection battery vent

Details Overcharge protection battery vent Overcharge protection battery vent

1995-07-31

1998-04-21

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Means externally releasing internal gas pressure from closed...

429 54, 429 56, 429 57, 429 61, H01M 212

Patent

active

057416060

ABSTRACT:
A cell pressure control system is disclosed which has a two stage control mechanism. In the first stage, increased cell pressure causes a conductive deflection member to bend to a position where it opens an electrical contact and places the cell in open circuit. This prevents current from flowing through the cell and thereby possibly slowing or preventing further increases in cell pressure. The electrical contact relies only upon the pressure of two members (one of which is the deflection member) pushing against one another. If the cell's internal pressure continues to increase even after the pressure contact is broken, the second stage of the pressure control mechanism is activated. Specifically, a pressure rupturable region in the above-mentioned deflection member ruptures to relieve the cell's internal pressure. The pressure rupturable region is a circularity scored region on the conductive deflection member.

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Sony Corporation IG by 650 millimeter B Cell, Apr. 1995.

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