US 12,360,169 B2
Disconnection testing apparatus for electrode tab of battery cell
Ju Mi Lee, Daejeon (KR); Ju Young Kim, Daejeon (KR); and In Hwan Cho, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 18/273,921
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Oct. 18, 2022, PCT No. PCT/KR2022/015899
§ 371(c)(1), (2) Date Jul. 24, 2023,
PCT Pub. No. WO2023/075273, PCT Pub. Date May 4, 2023.
Claims priority of application No. 10-2021-0142779 (KR), filed on Oct. 25, 2021.
Prior Publication US 2024/0110990 A1, Apr. 4, 2024
Int. Cl. G01R 31/389 (2019.01); G01R 31/385 (2019.01)
CPC G01R 31/389 (2019.01) [G01R 31/3865 (2019.01)] 15 Claims
OG exemplary drawing
 
1. An electrode tab disconnection inspection apparatus comprising:
an impedance measurement part connected to electrode leads of a battery cell to be inspected, and configured to measure an impedance value according to a frequency of the battery cell; and
a determination part configured to compare impedance value data according to the frequency of the battery cell to be inspected acquired by the impedance measurement part and a predetermined impedance value data group according to a frequency of normal battery cells having no disconnected electrode tabs or a frequency of tab disconnected battery cells having disconnected electrode tabs to determine whether the electrode tabs of the battery cell to be inspected is disconnected,
wherein the determination part selects a predetermined number of impedance value data points of the normal battery cells, tab disconnected battery cells, or normal and tab disconnected battery cells which are nearest neighbors to impedance value data of the battery cell to be inspected in a selected specific frequency range, and determines whether the electrode tabs of the battery cell to be inspected are disconnected according to a type of battery cell accounting for a larger number of the selected impedance value data points.