US 11,757,294 B2
Series-connected battery packs, system and method
Matthew J. Mergener, Mequon, WI (US); Timothy Ryan Obermann, Waukesha, WI (US); Kevin L. Glasgow, Lomira, WI (US); and Jeffrey M. Brozek, Mequon, WI (US)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Jul. 30, 2021, as Appl. No. 17/389,770.
Application 17/389,770 is a continuation of application No. 16/654,203, filed on Oct. 16, 2019, granted, now 11,095,148.
Application 16/654,203 is a continuation of application No. 15/603,862, filed on May 24, 2017, granted, now 10,483,791, issued on Nov. 19, 2019.
Claims priority of provisional application 62/341,397, filed on May 25, 2016.
Prior Publication US 2021/0359526 A1, Nov. 18, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H02J 7/00 (2006.01); H02J 9/06 (2006.01); H01M 10/42 (2006.01); H02P 27/08 (2006.01)
CPC H02J 7/0025 (2020.01) [H02J 7/00 (2013.01); H02J 7/0016 (2013.01); H02J 7/0024 (2013.01); H02J 7/0049 (2020.01); H02J 7/0063 (2013.01); H02J 9/06 (2013.01); H01M 10/4257 (2013.01); H02J 7/00302 (2020.01); H02J 9/068 (2020.01); H02J 2207/20 (2020.01); H02P 27/08 (2013.01); Y02E 60/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A battery discharge device comprising:
a housing defining a first support operable to support a first battery pack, and a second support operable to support a second battery pack;
discharge circuitry selectively connecting the first battery pack and the second battery pack in series, the discharge circuitry including an output terminal to provide an output voltage to a powered device; and
balance circuitry selectively connected to the first battery pack and the second battery pack, the balance circuitry being operable to transfer energy between the first battery pack and the second battery pack.