US 12,358,082 B2
Method for inspecting welding quality of welded portion between electrode tab and lead
Sang Ho Bae, Daejeon (KR); Hun Bum Jung, Daejeon (KR); Jae Hwa Choi, Daejeon (KR); Ji Hun Hwang, Daejeon (KR); Cha Hun Ku, Daejeon (KR); Su Taek Jung, Daejeon (KR); Chang Min Han, Daejeon (KR); and Young Seok Baek, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/801,107
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Jun. 22, 2021, PCT No. PCT/KR2021/007801
§ 371(c)(1), (2) Date Aug. 19, 2022,
PCT Pub. No. WO2022/055085, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 10-2020-0116258 (KR), filed on Sep. 10, 2020.
Prior Publication US 2023/0104232 A1, Apr. 6, 2023
Int. Cl. B23K 31/12 (2006.01); B23K 101/38 (2006.01); G01B 11/02 (2006.01); G01B 11/28 (2006.01); G01N 33/207 (2019.01); H01M 50/536 (2021.01)
CPC B23K 31/125 (2013.01) [G01B 11/02 (2013.01); G01B 11/28 (2013.01); G01N 33/207 (2019.01); B23K 2101/38 (2018.08); H01M 50/536 (2021.01)] 9 Claims
OG exemplary drawing
 
1. A method for inspecting a welding quality of an electrode tab-electrode lead welded portion of a pouch-type lithium secondary battery, comprising: obtaining the electrode tab-electrode lead welded portion welded by an ultrasonic welding device having a predetermined horn pitch, detecting welding traces of the welded portion by a vision inspection device; measuring a size of each of the recognized welding traces; and determining whether the welded portion has been weakly welded, excessively welded or normally welded by comparing the measured size with a reference value, wherein the reference value is determined based on the predetermined horn pitch;
wherein the determining includes determining that the welded portion has been weakly welded when an average value of sizes of the welding traces is smaller than the reference value, and determining that the welded portion has been excessively welded when the average value is greater than the reference value.