US 11,656,285 B2
Method for judging a low voltage defect in a lithium secondary battery
Dong Hui Kim, Gyeonggi-do (KR); Se Young Lee, Seoul (KR); and Dong Ju Lee, Gyeonggi-do (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed by Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed on Nov. 19, 2021, as Appl. No. 17/455,765.
Claims priority of application No. 10-2021-0066405 (KR), filed on May 24, 2021.
Prior Publication US 2022/0381833 A1, Dec. 1, 2022
Int. Cl. G01R 31/374 (2019.01); G01R 31/3835 (2019.01)
CPC G01R 31/374 (2019.01) [G01R 31/3835 (2019.01)] 6 Claims
OG exemplary drawing
 
1. A method for determining a low voltage defect in a lithium secondary battery, comprising:
measuring a primary voltage of a lithium secondary battery whose formation process has been completed;
transporting the lithium secondary battery;
measuring temperatures to which the lithium secondary battery has been exposed during the transporting process;
measuring a secondary voltage of a lithium secondary battery whose transporting has been completed;
based on the temperature to which the lithium secondary battery has been exposed, revising the secondary voltage to calculate a corrected secondary voltage; and
comparing the primary voltage and the corrected secondary voltage to determine whether the lithium secondary battery is defective.