US 12,224,605 B2
System and method for parallel battery pack charging
Zongchao Li, Shanghai (CN); Yuedong Zhang, Shanghai (CN); and Jiyang Liu, Shanghai (CN)
Assigned to LEAR CORPORATION, Southfield, MI (US)
Filed by Lear Corporation, Southfield, MI (US)
Filed on Nov. 5, 2021, as Appl. No. 17/453,778.
Claims priority of application No. 202011594393.5 (CN), filed on Dec. 29, 2020.
Prior Publication US 2022/0209549 A1, Jun. 30, 2022
Int. Cl. H02J 7/00 (2006.01)
CPC H02J 7/0019 (2013.01) [H02J 7/0024 (2013.01); H02J 7/007182 (2020.01)] 16 Claims
OG exemplary drawing
 
1. A battery management system, comprising:
a first battery pack;
a second battery pack;
a first charging circuit with a first switch to connect the first battery pack to a power source to enable charging;
a second charging circuit with a second switch to connect the second battery pack to the power source to enable charging, wherein the second charging circuit is arranged in parallel with the first charging circuit; and
a processor programmed to:
receive an input indicative of a first battery voltage and of a second battery voltage;
close the first switch and open the second switch, to enable charging of the first battery pack at a first charging current and disable charging of the second battery pack, in response to the first battery voltage being less than the second battery voltage;
reduce the first charging current to a second charging current in response to a difference between the first battery voltage and the second battery voltage being less than a predetermined threshold value and the first charging current exceeding a charging current threshold value; and
close the first switch and the second switch, to enable charging of the first battery pack and the second battery pack in parallel, in response to the first battery voltage being approximately equal to the second battery voltage.