US 11,940,501 B2
Method and apparatus for diagnosing low voltage of secondary battery cell
Yong Tae Lee, Daejeon (KR); Myung Hoon Ko, Daejeon (KR); Jee Ho Kim, Daejeon (KR); and Gyung Soo Kang, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/281,361
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Oct. 4, 2019, PCT No. PCT/KR2019/013027
§ 371(c)(1), (2) Date Mar. 30, 2021,
PCT Pub. No. WO2020/071848, PCT Pub. Date Apr. 9, 2020.
Claims priority of application No. 10-2018-0118866 (KR), filed on Oct. 5, 2018.
Prior Publication US 2022/0043068 A1, Feb. 10, 2022
Int. Cl. G01R 31/3842 (2019.01); G01R 31/385 (2019.01); H01M 10/44 (2006.01); H01M 10/48 (2006.01); H02J 7/00 (2006.01)
CPC G01R 31/3842 (2019.01) [G01R 31/3865 (2019.01); H01M 10/44 (2013.01); H01M 10/48 (2013.01); H02J 7/0047 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for diagnosing low voltage failure of a secondary battery cell, the method comprising:
pre-aging a battery cell;
charging the battery cell to have a preset voltage according to a preset charging condition, wherein the preset voltage is set to a voltage of which a voltage change rate with respect to a state of charge (SOC) is greater than or equal to a preset reference value;
measuring a parameter for determining the low voltage failure of the battery cell;
comparing the measured parameter with a reference parameter to determine whether the battery cell is normal; and
subjecting the pre-aged battery cell to a subsequent charging under a predetermined voltage condition when the battery cell is determined to be normal, wherein the subsequent charging is an initial charging of a formation process.