Rechargeable battery pack for a power tool including...

Details Rechargeable battery pack for a power tool including... Rechargeable battery pack for a power tool including...

2006-11-15

2009-08-04

Ullah, Akm E (Department: 2838)

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

For battery pack

C320S124000, C320S134000, C320S136000, C324S433000

Reexamination Certificate

active

07570017

ABSTRACT:
A battery pack for a power tool has a less-current consuming over-discharge protection. The battery pack includes a battery stack composed of a plurality of series connected secondary cells, and a discharge detector configured to monitor a cell voltage across each of the secondary cells and to provide a discharge stop signal when any one of the cell voltages becomes lower than a predetermined threshold. The discharge stop signal is fed to deenergize the power tool. The discharge detector is composed of a voltage monitor and a power controller. The voltage monitor includes a plurality of comparators and a plurality of constant voltage elements each providing a constant voltage determining the threshold. Each comparator is configured to compare each cell voltage with the threshold to give a comparison result. The voltage monitor is energized by the battery stack to provide the discharge stop signal based upon the comparison results. The power controller is configured to energize the voltage monitor when the battery pack is connected to the power tool. Thus, the discharge detector is protected from consuming the energy of the battery pack while being disconnected from the power tool.

REFERENCES:
patent: 5493197 (1996-02-01), Eguchi et al.
patent: 6268710 (2001-07-01), Koga
patent: 6329795 (2001-12-01), Nakashimo
patent: 6998818 (2006-02-01), Xiong et al.
patent: 7408325 (2008-08-01), Yamamoto et al.
patent: 2001/0017534 (2001-08-01), Haraguchi et al.
patent: 2005/0077878 (2005-04-01), Carrier et al.
patent: 2006/0255769 (2006-11-01), Liu et al.
patent: 0588613 (1994-03-01), None
patent: 1594209 (2005-11-01), None
patent: 2005-131770 (2005-05-01), None
patent: 2005-218174 (2005-08-01), None
European Search Report dated Apr. 4, 2007.

Affiliated with

Also associated with

Rating

Rechargeable battery pack for a power tool including... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rechargeable battery pack for a power tool including..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rechargeable battery pack for a power tool including... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4093934