US 7,253,585 B2 · Battery pack

Abstract

A method for conducting an operation including a power tool battery pack. The battery pack can include a housing, a first cell supported by the housing and having a voltage, and a second cell supported by the housing and having a voltage. The battery pack also can be connectable to a power tool and be operable to supply power to operate the power tool. The method can include discharging one of the first cell and the second cell until the voltage of the one of the first cell and the second cell is substantially equal to the voltage of the other of the first cell and the second cell.

Claims26

Dependent claims

A battery pack for powering a hand held power tool, the battery pack comprising:

a housing connectable to and supportable by the hand held power tool;
and
a plurality of battery cells supported by the housing, the battery cells having a combined nominal voltage of approximately 28-volts, the battery cells having a lithium-based chemistry.

Dependencies are inferred from the claim text.

Facts

Application

10/721,800Filed 24 Nov 2003 · us provisional application

Priority

22 Nov 2002

Published

US 2004/0257038 A123 Dec 2004

Granted

7 Aug 2007

Term ends

Not estimatedThe source records don’t support an estimate.

Classification20 codes

H02J 7/485
Circuit arrangements for charging or discharging batteries or for supplying loads from batteries: with provisions for charging different types of…
H01M 10/441
Methods for charging or discharging: for several batteries or cells simultaneously or sequentially
H01M 10/46
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: accumulators structurally combined with charging…
H01M 50/213
Characterised by their shape: adapted for cells having curved cross-section, e.g. round or elliptic

Family

Application60/428,356Us provisional application · filed 22 Nov 2002

Application60/428,358Us provisional application · filed 22 Nov 2002

Application60/428,450Us provisional application · filed 22 Nov 2002

Application60/428,452Us provisional application · filed 22 Nov 2002

Application60/440,693Us provisional application · filed 17 Jan 2003

Application60/440,692Us provisional application · filed 17 Jan 2003

Application60/523,716Us provisional application · filed 19 Nov 2003

Application60/523,712Us provisional application · filed 19 Nov 2003

US 2004/0257038 A1Pre-grant publication · published 23 Dec 2004

US 7,253,585 B2This patent

From the US filing history. Foreign family members aren’t listed.

Battery pack

Life of this patent

Battery pack

Life of this patent

Abstract

Claims26