US 11,656,287 B2
Battery defect screening device and method
Se Hwan Moon, Yongin-si (KR); Joo Young Go, Yongin-si (KR); Tae Ho Kwon, Yongin-si (KR); Jae Kyung Kim, Yongin-si (KR); Hyung Sik Kim, Yongin-si (KR); Jae Seung Shin, Yongin-si (KR); Jeong Won Oh, Yongin-si (KR); Man Sang Yoon, Yongin-si (KR); Hyung Chun Lee, Yongin-si (KR); and Kyong Min Jin, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Aug. 9, 2021, as Appl. No. 17/444,679.
Claims priority of application No. 10-2020-0147038 (KR), filed on Nov. 5, 2020; and application No. 10-2021-0018303 (KR), filed on Feb. 9, 2021.
Prior Publication US 2022/0137150 A1, May 5, 2022
Int. Cl. G01R 31/3842 (2019.01); G01R 31/396 (2019.01); H02J 7/00 (2006.01); G01R 31/389 (2019.01)
CPC G01R 31/3842 (2019.01) [G01R 31/396 (2019.01); H02J 7/0047 (2013.01); G01R 31/389 (2019.01)] 20 Claims
OG exemplary drawing
 
1. A battery defect screening device comprising:
a battery fixer for fixing a secondary battery;
a discharger for discharging the secondary battery;
a charger for charging the secondary battery;
a voltmeter for measuring an initial voltage value after charging the secondary battery, for measuring a first voltage value after a first time period, and for measuring a second voltage value after a second time period; and
a defect screener for:
determining the secondary battery to be a normal battery that is without a foreign material when a first voltage change value, which is obtained by subtracting the first voltage value from the initial voltage value, is less than a first reference value;
determining the secondary battery to be a defective battery having a hard short due to the foreign material when the first voltage change value is greater than the first reference value;
determining the secondary battery to be the normal battery that is without the foreign material when a second voltage change value, which is obtained by subtracting the second voltage value from the initial voltage value, is less than a second reference value; and
determining the secondary battery to be a defective battery having a soft short due to the foreign material when the second voltage change value is greater than the second reference value.