Protection device and battery cell using this protection device

Details Protection device and battery cell using this protection device Protection device and battery cell using this protection device

1995-07-06

2000-09-19

Maples, John S.

Chemistry: electrical current producing apparatus, product, and

With control means responsive to battery condition sensing...

429 7, 429 90, 200 6108, H01M 1048

Patent

active

061209287

ABSTRACT:
A protection device for preventing swelling or breakage of a battery cell in response to over-charging and/or an over-current condition. The protection device is connected between an internal electrode and an external electrode within the battery cell and includes an electrically conducting casing and an electrically conducting and flexing lid member which are connected through a holding member so as to seal an inner portion of the casing. A breakable electrically conductive member is positioned within the sealed inner portion which electrically connects the casing and the lid member. The lid member includes a projection which abuts against a central portion of the electrical conductive member. In an over-charge or over-current condition, increased pressure within the battery cell causes the projection of the lid member to press against the electrically conductive member, thereby causing the electrically conductive member to break such that the electrical connection between the casing and the lid member is broken.

REFERENCES:
patent: 4943497 (1990-07-01), Oishi et al.
patent: 5543246 (1996-08-01), Treger

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