Rechargeable battery pack for a power tool having an...

Details Rechargeable battery pack for a power tool having an... Rechargeable battery pack for a power tool having an...

2006-11-15

2010-02-09

Tso, Edward (Department: 2838)

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

For battery pack

C320S116000, C320S119000, C320S124000, C320S134000, C320S136000, C324S433000

Reexamination Certificate

active

07659692

ABSTRACT:
A battery pack for a power tool of self-contained over-charge protection is proposed. The battery pack includes a battery stack composed of a plurality of series connected secondary cells, and a charge terminal connected through a charge current path to the battery stack for flowing a charge current from a charger. The battery pack includes an interrupter inserted in the charge current path, and an over-charge detector which detects a cell voltage across each of the secondary cells and actuates the interrupter to open the charge current path when any one of the cell voltages becomes higher than a predetermined threshold (VTH3). Thus, even if the charger fails to limit the charge current, the battery pack can itself protect the secondary cells from being over-charged.

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Japanese Office Action dated Jun. 3, 2008 issued in JP2005-333282.

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