US 11,981,219 B2
Battery charging system and battery charging method
Hyeon Jin Song, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/280,578
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Dec. 17, 2019, PCT No. PCT/KR2019/017908
§ 371(c)(1), (2) Date Mar. 26, 2021,
PCT Pub. No. WO2020/149537, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 10-2019-0005245 (KR), filed on Jan. 15, 2019.
Prior Publication US 2022/0001755 A1, Jan. 6, 2022
Int. Cl. B60L 53/12 (2019.01); B60L 58/10 (2019.01); B60L 58/22 (2019.01); H02J 7/00 (2006.01); H02J 50/10 (2016.01)
CPC B60L 53/12 (2019.02) [B60L 58/10 (2019.02); B60L 58/22 (2019.02); H02J 7/00045 (2020.01); H02J 7/0019 (2013.01); H02J 7/0047 (2013.01); H02J 50/10 (2016.02)] 17 Claims
OG exemplary drawing
 
1. A battery charging system, comprising:
a first battery pack; and
a second battery pack,
wherein the first battery pack includes a first battery;
wherein the second battery pack includes:
a second battery;
a first capacitor connected in series between a positive electrode and a negative electrode of the second battery; and
a first battery management system (BMS) configured to measure a voltage of the second battery and voltages of both ends of the first capacitor, wherein the first BMS is configured to:
calculate a voltage of the second battery by using the voltages of the both ends of the first capacitor,
compare the voltage of the first battery with the voltage of the second battery,
when the voltage of the first battery is higher than the voltage of the second battery, charge the second battery with the voltage of the first battery, and
when the voltage of the first battery is lower than the voltage of the second battery, charge the first battery with the voltage of the second battery and
wherein the first battery pack and the second battery pack are charged by a non-contact connection.