US 12,241,943 B2
Method for early detection of an internal short in a battery pack
Taeyoung Han, Bloomfield Hills, MI (US); and Jun-mo Kang, Ann Arbor, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Jul. 14, 2021, as Appl. No. 17/375,491.
Prior Publication US 2023/0017485 A1, Jan. 19, 2023
Int. Cl. G01R 31/52 (2020.01); G01R 31/396 (2019.01); H01M 10/44 (2006.01); H02J 7/00 (2006.01); G01R 31/00 (2006.01); G01R 31/36 (2020.01)
CPC G01R 31/52 (2020.01) [G01R 31/396 (2019.01); H01M 10/441 (2013.01); H02J 7/00718 (2020.01); G01R 31/007 (2013.01); G01R 31/3646 (2019.01); H01M 2220/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of detecting an internal short in a battery pack of a vehicle, comprising:
discharging the battery pack to identify a first set of impaired battery cells of the battery pack based on a discharge rate of the first set of impaired battery cells being greater than an average discharge rate for the battery pack, wherein the discharge rate of an impaired battery cell is from full charge to about 71% of full charge in 900 seconds;
charging the battery pack to identify a second set of impaired battery cells of the battery pack based on a charge rate of the second set of impaired battery cells being less than an average charge rate for the battery pack, wherein the charge rate of the impaired battery cell is from zero charge to about 21% of full charge in 900 seconds;
identifying a battery cell having an internal short when the battery cell is in an intersection of the first set of impaired battery cells and the second set of impaired battery cells; and
generating an alarm when the battery cell having the internal short is identified.