US 12,344,120 B2
Battery management system, battery management method, battery pack, and electric vehicle
A-Ming Cha, Daejeon (KR); Yoon-Jung Bae, Daejeon (KR); Dae-Soo Kim, Daejeon (KR); Bo-Mi Lim, Daejeon (KR); and Hyun-Jun Choi, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/921,397
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Aug. 13, 2021, PCT No. PCT/KR2021/010835
§ 371(c)(1), (2) Date Oct. 26, 2022,
PCT Pub. No. WO2022/035293, PCT Pub. Date Feb. 17, 2022.
Claims priority of application No. 10-2020-0101932 (KR), filed on Aug. 13, 2020; and application No. 10-2021-0106953 (KR), filed on Aug. 12, 2021.
Prior Publication US 2023/0191942 A1, Jun. 22, 2023
Int. Cl. G01R 31/3842 (2019.01); B60L 58/12 (2019.01); H01M 10/42 (2006.01); H01M 50/204 (2021.01)
CPC B60L 58/12 (2019.02) [G01R 31/3842 (2019.01); H01M 10/425 (2013.01); H01M 50/204 (2021.01); B60L 2240/547 (2013.01); B60L 2240/549 (2013.01); H01M 2010/4271 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A battery management system, comprising:
a voltage sensor configured to generate a voltage sensing signal indicating a voltage of a battery;
a current sensor configured to generate a current sensing signal indicating a voltage of a battery;
memory configured to store over-potential management information including a reference peak value and a reference peak voltage value; and
a controller
wherein the memory has programmed thereon instructions that, when executed by the controller, cause the controller to:
command first constant-current charging using a maximum allowable current rate (C-rate) to a charging circuit connected to the battery, in response to the reference peak value being equal to or larger than a threshold peak value when a charge request is received;
determine a first differential capacity curve indicating a correlation between the voltage of the battery and a differential capacity of the battery for a range of voltages within a threshold voltage range based on the voltage and current sensing signals generated during the first constant-current charging;
determine a first main peak value indicating a differential capacity of a first peak of the first differential capacity curve;
determine a first main peak voltage value indicating a voltage of the first peak of the first differential capacity curve; and
update the reference peak value to be equal to the first main peak value and the reference peak voltage value to be equal to the first main peak voltage value, in response to the first main peak value being less than the threshold peak value.