Lithium ion battery and method of power conservation for the...

Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging

Reexamination Certificate

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C320S132000

Reexamination Certificate

active

07638976

ABSTRACT:
A lithium ion battery and a method of power conservation for the same are provided. A bare cell including an electrode assembly with a plurality of electrodes and a protective circuit are coupled together via the plurality of electrodes. The protective circuit includes a remaining charge control circuit that internally detects a long-term nonuse state of the lithium ion battery and blocks current between the bare cell and the protective circuit when the long-term nonuse state is detected. The method includes: detecting whether the battery is used as a power source for an external instrument; determining and recording a value of an accumulated nonuse time when the lithium ion battery was not used as a power source; and blocking an internal current and converting the battery to a long-term nonuse mode when the value of the accumulated nonuse time is above a value indicative of a predetermined time.

REFERENCES:
patent: 6492791 (2002-12-01), Saeki et al.
patent: 6545447 (2003-04-01), Smith
patent: 4-29532 (1992-01-01), None
patent: 10-136574 (1998-05-01), None
Patent Abstracts of Japan; Publication No. 04-029532; Publication Date: Jan. 31, 1992; in the name of Miyazaki.
Patent Abstracts of Japan; Publication No. 10-136574; Publication Date: May 22, 1998; in the name of Hayashi et al.

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