US 12,451,705 B2
Method of battery balancing and battery system providing the same
Jin Man Kim, Daejeon (KR); and Kiwook Jang, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed on Mar. 17, 2022, as Appl. No. 17/697,584.
Claims priority of application No. 10-2021-0025894 (KR), filed on Feb. 25, 2021.
Prior Publication US 2022/0278534 A1, Sep. 1, 2022
Int. Cl. H02J 7/00 (2006.01); G01R 31/396 (2019.01); H01M 10/42 (2006.01); H01M 10/44 (2006.01)
CPC H02J 7/0024 (2013.01) [G01R 31/396 (2019.01); H01M 10/425 (2013.01); H01M 10/441 (2013.01); H02J 7/0063 (2013.01); H02J 7/007182 (2020.01); H01M 2010/4271 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A battery system comprising:
a battery pack including a plurality of battery modules;
a switching circuit connecting the plurality of battery modules in series or in parallel;
a battery management system (BMS) configured to control the switching circuit so as to connect the plurality of battery modules in series in a discharge mode to supply power from the battery pack to an external device and in a charge mode to charge the battery pack by receiving the power from the external device;
a plurality of first parallel switches including a first end connected to an anode of the plurality of battery modules; and
a plurality of second parallel switches including a first end connected to a cathode of the plurality of battery modules,
wherein the BMS is configured to control the switching circuit so as to connect the plurality of battery modules in parallel in a module balancing mode to charge the plurality of battery modules with the power applied from the external device until a voltage difference among the plurality of battery modules is a predetermined reference value or less,
wherein each of the plurality of battery modules includes a voltage unit configured to measure a voltage of the respective battery module and transmit the measured voltage to the BMS, and
wherein the voltage unit is located between a respective first switch of the plurality of first parallel switches and a respective second switch of the plurality of second parallel switches of each battery module.