Electrochemical cell with circuit disconnect device

Details Electrochemical cell with circuit disconnect device Electrochemical cell with circuit disconnect device

1990-03-14

1991-02-12

Kalafut, Stephen J.

Chemistry: electrical current producing apparatus, product, and

With nonbattery electrical component electrically connected...

429 62, H07M 226

Patent

active

049923390

ABSTRACT:
The invention relates to an electrochemical cell employing a resettable safety disconnect device operable by a nonresettable shape memory alloy element. The shape memory alloy element is preferably in the form of a twisted wire that is restrained in the normal operation of the cell and expands when the internal temperature exceeds a preselected value whereupon the shape memory alloy wire will exert force on a moveable element in the electrical circuit of the cell to break contact in the electrical circuit thereby rendering the cell inoperative. This device could also include an opposing spring member to restore the shape memory alloy element to its original shape upon cooling and thus restore electrical contact.

REFERENCES:
patent: 4788112 (1988-11-01), Kung
patent: 4855195 (1989-08-01), Georgopoulos et al.

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