US 12,467,979 B2
Abnormal cell diagnosing method and battery system applying the same
Junguk Park, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/789,966
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Jul. 20, 2021, PCT No. PCT/KR2021/009296
§ 371(c)(1), (2) Date Jun. 29, 2022,
PCT Pub. No. WO2022/019600, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 10-2020-0092349 (KR), filed on Jul. 24, 2020.
Prior Publication US 2022/0390520 A1, Dec. 8, 2022
Int. Cl. G01R 31/385 (2019.01); G01R 19/165 (2006.01); G01R 19/30 (2006.01); G01R 31/396 (2019.01); H01M 10/42 (2006.01); H01M 10/48 (2006.01)
CPC G01R 31/385 (2019.01) [G01R 19/16542 (2013.01); G01R 19/30 (2013.01); G01R 31/396 (2019.01); H01M 10/425 (2013.01); H01M 10/482 (2013.01); H01M 2010/4271 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A battery system comprising:
a battery pack including a plurality of battery cells; and
a battery management system configured to:
(i) at an initial time:
initially measure respective cell voltages of the battery cells;
classify two or more of the plurality of battery cells as at least one a first diagnosis target battery cell and at least one second diagnosis target battery cell, respectively, based on the initially measured respective cell voltages of the at least two battery cells, wherein the at least two battery cells are classified such that at the initial time each first diagnosis target battery cell has a higher voltage than each second diagnosis target battery cell;
(ii) after the initial time, periodically measure the respective cell voltages of the battery cells;
(iii) for a given time at which the respective cell voltages of the battery cells are measured:
detect a maximum cell voltage and a minimum cell voltage among the respective cell voltages measured at the given time;
compare the minimum cell voltage to a measured cell voltage of each one of the at least one first diagnosis target battery cells at the given time,
compare the maximum cell voltage to a measured cell voltage of each one of the at least one second diagnosis target battery cells at the given time,
diagnose whether either or both of the first and second diagnosis target battery cells is abnormal according to results of the comparisons, and
(iv) stop operation of the abnormal battery cells according to the diagnosis.