US 12,135,356 B2
Apparatus and method for diagnosing state of battery pack
Dong-Chun Lee, Daejeon (KR); Won-Hoe Lee, Daejeon (KR); Seog-Jin Yoon, Daejeon (KR); and Suk-Hoon Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/424,280
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Jul. 10, 2020, PCT No. PCT/KR2020/009144
§ 371(c)(1), (2) Date Jul. 20, 2021,
PCT Pub. No. WO2021/006708, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 10-2019-0083361 (KR), filed on Jul. 10, 2019.
Prior Publication US 2022/0069371 A1, Mar. 3, 2022
Int. Cl. G01R 31/382 (2019.01); G01R 31/36 (2020.01); G01R 31/3842 (2019.01); G01R 31/388 (2019.01); G01R 31/396 (2019.01); H01M 10/48 (2006.01)
CPC G01R 31/382 (2019.01) [G01R 31/3648 (2013.01); G01R 31/3842 (2019.01); G01R 31/388 (2019.01); G01R 31/396 (2019.01); H01M 10/482 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An apparatus for diagnosing a state of a battery pack, comprising:
a charging and discharging assembly configured to discharge and charge a plurality of battery modules having a plurality of battery cells connected to each other, in a plurality of cycles;
a monitoring assembly configured to measure a voltage or current of the plurality of battery modules in a fully charged state, in every cycle; and
a controller configured to, in every cycle:
change a number of battery cells included in the plurality of battery modules and connected to each other,
receive a measurement value for the voltage or current of the plurality of battery modules measured by the monitoring assembly,
estimate a state of charge (SOC) of each of the plurality of battery modules based on the received measurement value,
calculate a SOC change amount by comparing the estimated SOC of each of the plurality of battery modules with a preset reference value, and
diagnose a state of the plurality of battery modules based on the calculated SOC change amount and the changed number of battery cells included in the plurality of battery modules.