US 12,392,835 B2
Method of estimating state of charge of battery
Jake Kim, Yongin-si (KR); Giheon Kim, Yongin-si (KR); Sangwoo Kim, Pohang-si (KR); Youngbin Song, Pohang-si (KR); and Minhwan Seo, Pohang-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR); and POSTECH Research and Business Development Foundation, Pohang-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR); and POSTECH Research and Business Development Foundation, Pohang-si (KR)
Filed on May 25, 2023, as Appl. No. 18/202,184.
Claims priority of application No. 10-2022-0064256 (KR), filed on May 25, 2022.
Prior Publication US 2023/0384387 A1, Nov. 30, 2023
Int. Cl. G01R 31/3842 (2019.01); G01R 31/367 (2019.01)
CPC G01R 31/3842 (2019.01) [G01R 31/367 (2019.01)] 10 Claims
OG exemplary drawing
 
1. A method of estimating a state of charge of a battery, the method comprising:
generating a present voltage value Vt(k) and a present current value IL(k) by detecting a voltage and a current of the battery;
determining a reference open-circuit voltage value VOC,ref(k) based on a state-of-charge estimation value SOC(k);
estimating first to third parameter values α1(k), α2(k), and α3(k) from the present voltage value Vt(k), the reference open-circuit voltage value VOC,ref(k), the present current value IL(k), and a previous current value IL(k−1) by using recursive least squares (RLS); and
determining, using an extended Kalman filter (EKF), a next state-of-charge estimation value SOC(k+1) of the battery from the state-of-charge estimation value SOC(k), the present voltage value Vt(k), the reference open-circuit voltage value VOC,ref(k), the present current value IL(k), the previous current value IL(k−1), and the first to third parameter values α1(k), α2(k), and α3(k).