Methods of discharge control for a battery pack of a cordless power tool system, a cordless power tool system and battery pack adapted to provide over-discharge protection and discharge control

a technology of cordless power tools and battery packs, applied in the direction of secondary cell servicing/maintenance, cell components, safety/protection circuits, etc., can solve the problems of li-ion batteries that require over-discharge protection, battery deterioration, and high voltages for higher-power electronic devices such as cordless power tools
US20050073282A1Inactive Publication Date: 2005-04-07BLACK & DECKER INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
BLACK & DECKER INC
Publication Date
2005-04-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

In a cordless power tool system, a battery pack which may removably attachable to a cordless power tool and to a charger may include at least one battery cell and a power limiting device. The power limiting device may be arranged in series with the at least one battery cell for limiting power output of the battery pack based on the component that is connected to the pack. Current and hence power out of the battery pack may be controlled as a function of total internal impedance in the battery pack, which may be adjusted depending on the component that is connected to the pack.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims domestic priority under 35 U.S.C. §120 to the following related U.S. Provisional patent applications filed in the United States Patent & Trademark Office: U.S. Provisional Application Ser. No. 60 / 507,955, filed Oct. 3, 2003, U.S. Provisional Application Ser. No. 60 / 510,125, filed Oct. 14, 2003, and U.S. Provisional Application Ser. No. 60 / 540,323, filed Feb. 2, 2004. The entire contents of the disclosures for each of these provisional applications are incorporated herein by reference.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to methods of discharge control for rechargeable batteries, to a cordless power tool system adapted to provide over-discharge protection and discharge control for an attached battery pack, and to a battery pack including discharge control and over-discharge protection circuits and components.

[0004] 2. Description of Related Art

[0005] O...

Claims

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