US 12,169,223 B2
Method and apparatus for battery SOC correction, and battery management system
Shan Huang, Jiangsu (CN); Shichao Li, Jiangsu (CN); Mingshu Du, Jiangsu (CN); and Guangyu Xu, Jiangsu (CN)
Assigned to JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED, Changzhou (CN)
Filed by Jiangsu Contemporary Amperex Technology Limited, Jiangsu (CN)
Filed on Nov. 3, 2022, as Appl. No. 17/979,760.
Application 17/979,760 is a continuation of application No. PCT/CN2021/138559, filed on Dec. 15, 2021.
Claims priority of application No. 202110005195.9 (CN), filed on Jan. 5, 2021.
Prior Publication US 2023/0047373 A1, Feb. 16, 2023
Int. Cl. G01R 31/367 (2019.01); G01R 31/3835 (2019.01); G01R 35/00 (2006.01)
CPC G01R 31/367 (2019.01) [G01R 31/3835 (2019.01); G01R 35/005 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for battery SOC correction, comprising:
acquiring a voltage-SOC variation curve of a battery during a charging process;
generating a voltage differential curve of the battery according to the voltage-SOC variation curve, the voltage differential curve being a variation curve of a differential value with SOC, the differential value being a ratio of a voltage variation to a SOC variation corresponding to the voltage variation during the charging process;
determining a peak point on the voltage differential curve, the peak point being between any two adjacent plateaus on the voltage-SOC variation curve and not located on the any two adjacent plateaus;
performing SOC correction on the basis of the peak point,
wherein the generating a voltage differential curve of the battery according to the voltage-SOC variation curve comprises:
for each time,
acquiring N incremental voltages on the voltage-SOC variation curve, recording moments corresponding to the N incremental voltages, and calculating SOC variations corresponding to the N incremental voltages, wherein N is a positive integer greater than or equal to 5, and
calculating N−1 differential values on the basis of the N incremental voltages and the SOC variations corresponding to the N incremental voltages; and
generating the voltage differential curve on the basis of the N−1 differential values calculated each time.