Rechargeable battery with a built-in safety circuit for a portab

Details Rechargeable battery with a built-in safety circuit for a portab Rechargeable battery with a built-in safety circuit for a portab

1997-12-22

2000-04-11

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Switching systems

Condition responsive

320136, 361 79, H01H 3500

Patent

active

060491442

ABSTRACT:
A rechargeable battery for a portable electric apparatus has at least one battery cell and a fuse device connected in series with the battery cell. Furthermore, the battery has a voltage-controlled active device, which is connected in parallel to the battery cell and which is arranged to assume a substantially non-conductive state and a conductive state, respectively, in response to the voltage at a control input, and a reference voltage device, which is connected to the control input of the active device. The active device is arranged to switch from the non-conductive state to the conductive state, when the voltage across the battery cell deviates, by a predetermined value, from a reference voltage supplied by the reference voltage device, thereby establishing a short circuit across the battery cell and release of the fuse device. The voltage-controlled active device, the reference voltage device and the fuse device form an integrated electronic component.

REFERENCES:
patent: 3708738 (1973-01-01), Crawford et al.
patent: 5164874 (1992-11-01), Okano et al.
patent: 5179337 (1993-01-01), Staarman et al.
patent: 5355073 (1994-10-01), Nguyen
patent: 5625273 (1997-04-01), Fehling et al.
patent: 5640150 (1997-06-01), Atwater
patent: 5764033 (1998-06-01), Tamai

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