Current interrupt device for rechargeable cells

Details Current interrupt device for rechargeable cells Current interrupt device for rechargeable cells

2005-05-31

2005-05-31

Tso, Edward H. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Gas controlled

Reexamination Certificate

active

06900616

ABSTRACT:
A current interrupt device for rechargeable, electrochemical cells having a safety valve, insulating spacer and a thin metal plate for coupling to an electrode assembly is provided. The thin metal plate electrically couples to the safety valve by way of a conductive polymer, preferably having a positive temperature coefficient characteristic. The positive temperature coefficient characteristic is such that the impedance of the polymer increases with increasing temperature. In normal operation, the polymer conducts current. In high current situations, where internal components heat due to parasitic resistances, the polymer becomes an insulator and disconnects the cell from the exterior can. When gasses build within the cell, the safety valve deforms, thereby causing the safety valve to separate from the thin metal plate. Once the safety valve and thin metal plate have separated, the electrode assembly is electrically isolated from the exterior can.

REFERENCES:
patent: 3706617 (1972-12-01), Stark et al.
patent: 3969146 (1976-07-01), Tietze
patent: 5418082 (1995-05-01), Taki et al.
patent: 5580679 (1996-12-01), Tanaka
patent: 5738952 (1998-04-01), Abe

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