US 12,451,715 B2
Battery, electric apparatus, and charging method and apparatus for battery
Chen Chen, Ningde (CN); Lei Huang, Ningde (CN); Guangyu Xu, Ningde (CN); and Wei Zhao, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG kONG) LIMITED, Hong Kong (CN)
Filed on Jun. 14, 2022, as Appl. No. 17/839,607.
Application 17/839,607 is a continuation of application No. PCT/CN2021/082193, filed on Mar. 22, 2021.
Prior Publication US 2022/0320888 A1, Oct. 6, 2022
Int. Cl. H02J 7/00 (2006.01); G01R 31/367 (2019.01); G01R 31/3835 (2019.01); B60L 58/16 (2019.01)
CPC H02J 7/007182 (2020.01) [G01R 31/367 (2019.01); G01R 31/3835 (2019.01); H02J 7/0049 (2020.01); H02J 7/005 (2020.01); B60L 58/16 (2019.02); H02J 7/0031 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for charging a battery, comprising:
obtaining a capacity decline of the battery in a k-th discharging process, wherein the capacity decline is a change of state of health (SOH) of the battery in the k-th discharging process, wherein a start time of the k-th discharging process is an end time of an (m−1)-th charging process of the battery, and an end time of the k-th discharging process is a start time of an m-th charging process of the battery, wherein k is an integer greater than 1, and m is an integer greater than or equal to 1;
obtaining, based on the capacity decline in the k-th discharging process and capacity declines in previous k−1 discharging processes, a historical capacity decline of the battery, wherein the historical capacity decline is a sum of the capacity declines in the k discharging processes;
determining, based on a nominal capacity of the battery and the historical capacity decline of the battery, a full charge voltage of the battery in the m-th charging process; and
performing, based on the full charge voltage of the battery in the m-th charging process, the m-th charging process on the battery;
wherein obtaining the capacity decline of the battery in the k-th discharging process comprises:
obtaining discharging parameters of the battery in the k-th discharging process, wherein the discharging parameters comprise an average current, an average temperature, a battery capacity interval, and a cumulative throughput, wherein an upper limit of the battery capacity interval is a battery capacity of the battery at the end of the (m−1)-th charging process, and a lower limit of the battery capacity interval is a battery capacity of the battery at the beginning of the m-th charging process; and
determining, based on the average current, the average temperature, the battery capacity interval, and the cumulative throughput of the battery in the k-th discharging process, the capacity decline in the k-th discharging process according to the following equation:

OG Complex Work Unit Math
wherein ΔSOHk is the capacity decline in the k-th discharging process, Ca, Eb and z are predetermined constants of the battery, R is 8.314, T is the average temperature, T0 is 298.15 degrees kelvin, SOCupk is the upper limit of the battery capacity interval in the k-th discharging process, SOClowk is the lower limit of the battery capacity interval in the k-th discharging process, Ck is the average current in the k-th discharging process, ΔCk is the cumulative throughput in the k-th discharging process, f(SOCupk) is a function associated with the upper limit of the battery capacity interval in the k-th discharging process, f(SOClowk) is a function associated with the lower limit of the battery capacity interval in the k-th discharging process, and f(Ck) is a function associated with the average current in the k-th discharging process.