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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10998586 B1

PDFFull Text
Date of Patent:
May. 04, 2021

Filed:

Sep. 30, 2019

Lithium-based battery pack including a balancing circuit

Applicant:

Milwaukee Electric Tool Corporation, Brookfield, WI (US);

Inventors:

Todd W. Johnson, Wauwatosa, WI (US);

Dennis J. Grzybowski, New Berlin, WI (US);

Mark A. Kubale, West Bend, WI (US);

Jay J. Rosenbecker, Menomonee Falls, WI (US);

Gary D. Meyer, Waukesha, WI (US);

Jeffrey M. Zeiler, Pewaukee, WI (US);

Kevin L. Glasgow, Lomira, WI (US);

Karl F. Scheucher, Waite Hill, OH (US);

Assignee:

MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US);

Attorney:

Michael Best & Friedrich LLP

Primary Examiner:

Yalkew Fantu

Int. Cl.
CPC ...
H02J 7/00 (2006.01); H01M 10/48 (2006.01); B25F 5/00 (2006.01); H01M 2/10 (2006.01); H01M 4/505 (2010.01); H01M 10/052 (2010.01); H01M 10/0525 (2010.01); H01M 10/42 (2006.01); H01M 10/44 (2006.01); H01M 10/46 (2006.01); H02J 7/04 (2006.01); H01M 2/34 (2006.01); H01M 4/525 (2010.01); H01M 2/30 (2006.01); G01R 31/382 (2019.01);
U.S. Cl.
CPC ...
H01M 10/482 (2013.01); B25F 5/00 (2013.01); H01M 2/1022 (2013.01); H01M 2/1055 (2013.01); H01M 2/30 (2013.01); H01M 2/34 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01); H01M 10/425 (2013.01); H01M 10/4207 (2013.01); H01M 10/441 (2013.01); H01M 10/46 (2013.01); H02J 7/00 (2013.01); H02J 7/0016 (2013.01); H02J 7/0021 (2013.01); H02J 7/0026 (2013.01); H02J 7/0031 (2013.01); H02J 7/0045 (2013.01); H02J 7/0063 (2013.01); H02J 7/0071 (2020.01); H02J 7/042 (2013.01); H05K 999/99 (2013.01); G01R 31/382 (2019.01); H01M 2/1016 (2013.01); H01M 2010/4271 (2013.01); H01M 2200/00 (2013.01); H01M 2220/30 (2013.01); Y02E 60/10 (2013.01); Y10T 408/65 (2015.01);
Abstract

An electrical combination including a power tool and a battery pack. The power tool includes power tool terminals. The battery pack is configured to be interfaced with the power tool. The battery pack includes a battery pack housing, at least three terminals, and a plurality of battery cells. The battery pack terminals include a positive terminal, a negative terminal, and a sense terminal. The at least three terminals are configured to be interfaced with the power tool terminals. The plurality of battery cells are arranged within and supported by the battery pack housing. Each of the battery cells has a lithium-based chemistry and a respective state of charge, and power is transferable between the battery cells and the power tool. A circuit is configured to monitor the battery cells, detect a charge imbalance among the battery cells, and prevent the battery pack from operating when the charge imbalance is detected.

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