US 12,216,173 B2
Method for detecting defective battery cell and battery management system providing the same
Bokyun Lee, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 18/025,428
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Jul. 27, 2022, PCT No. PCT/KR2022/011039
§ 371(c)(1), (2) Date Mar. 9, 2023,
PCT Pub. No. WO2023/008904, PCT Pub. Date Feb. 2, 2023.
Claims priority of application No. 10-2021-0100431 (KR), filed on Jul. 30, 2021.
Prior Publication US 2024/0019497 A1, Jan. 18, 2024
Int. Cl. G01R 31/392 (2019.01); G01R 31/367 (2019.01); G01R 31/382 (2019.01); G01R 31/3835 (2019.01); G01R 31/396 (2019.01); G06F 15/16 (2006.01); G06F 15/173 (2006.01); H02J 7/00 (2006.01)
CPC G01R 31/392 (2019.01) [G01R 31/367 (2019.01); G01R 31/382 (2019.01); G01R 31/3835 (2019.01); G01R 31/396 (2019.01); H02J 7/0013 (2013.01); H02J 7/0047 (2013.01); H02J 7/007182 (2020.01); G06F 15/161 (2013.01); G06F 15/17306 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A battery management system that detects a defective battery cell in a battery including a plurality of battery cells, comprising:
a cell monitoring integrated circuit (IC) that is connected to opposite ends of each battery cell of the plurality of battery cells and is configured to measure a respective cell voltage of each battery cell of the plurality of battery cells; and
a main control circuit configured to, for each battery cell of the plurality of battery cells:
for each charge/discharge cycle of the battery:
detect whether a cell voltage of the battery cell reaches a charge final voltage before any other battery cell of the plurality of battery cells, and
detect whether the cell voltage of the battery cell reaches a discharge final voltage before any other battery cell of the plurality of battery cells,
when a number of the charge/discharge cycles satisfies a first reference count, determine a first count of how many times the battery cell reaches the charge final voltage before any other battery cell of the plurality of battery cells, and a second count of how many times the battery cell reaches the discharge final voltage before any other battery cell of the plurality of battery cells, and
determine that the battery cell is defective in response to a total of the first count and the second count being greater than or equal to a second reference count.