Methods of charging battery packs for cordless power tool...

Details Methods of charging battery packs for cordless power tool... Methods of charging battery packs for cordless power tool...

2006-10-27

2010-02-02

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With detection of current or voltage amplitude

C320S139000, C320S152000, C320S157000

Reexamination Certificate

active

07656131

ABSTRACT:
In a method of charging a battery pack, the pack is inserted in a charger and an initial set of checks of cell voltage and pack temperature is performed. Once the initial set of checks is satisfied, the cells may be charged at a first constant current level. The first constant current level is adjusted to one or more lower levels of constant current until cell voltages of all the cells are within a full charge voltage window. The voltage window is defined between a minimum full charge cell voltage level and a maximum full charge cell voltage level. The charge may be terminated once all of the cells are within the full charge voltage window.

REFERENCES:
patent: 5703466 (1997-12-01), Honda et al.
patent: 5982152 (1999-11-01), Watanabe et al.
patent: 6268710 (2001-07-01), Koga
patent: 2004/0086784 (2004-05-01), Barker et al.
patent: 2004/0113587 (2004-06-01), Bohne et al.
patent: 2005/0264263 (2005-12-01), Tsenter

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