Battery pack

Details Battery pack Battery pack

2011-07-12

2011-07-12

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S112000, C320S132000, C320S162000

Reexamination Certificate

active

07977916

ABSTRACT:
A battery pack includes a secondary cell, a selection unit, a judging unit, an elapsed time period comparing unit, and a control unit. The selection unit selects either a first operation state or a second operation state. The control unit controls the selection unit to switch from the first operation state to the second operation state when the elapsed time period is longer than a predetermined time period. The control unit also controls the selection unit to switch from a second operation state to a first operation state either (a) when judged as being in an used state by the judging unit while the second operation is selected (b) when a voltage of the second cell becomes equal to or less than a second voltage threshold value which is smaller than a first voltage threshold value while the second operation state is selected.

REFERENCES:
patent: 2005/0057220 (2005-03-01), Miwa et al.
patent: 2002-078222 (2002-03-01), None
patent: 2003-125540 (2003-04-01), None

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