US 12,021,400 B2
Voltage balancing system for balancing unbalanced battery pack voltage caused by non-cascade of analog front ends
Huage Wang, Jiangsu (CN); Baoan Li, Jiangsu (CN); Xian Zhuang, Jiangsu (CN); Chuanjun Liu, Jiangsu (CN); and Zhiyuan Li, Jiangsu (CN)
Assigned to Globe (Jiangsu) Co., Ltd, Changzhou (CN)
Filed by Globe (Jiangsu) Co., Ltd, Jiangsu (CN)
Filed on Sep. 30, 2020, as Appl. No. 17/038,080.
Claims priority of application No. 201910967173.3 (CN), filed on Oct. 12, 2019.
Prior Publication US 2021/0111567 A1, Apr. 15, 2021
Int. Cl. H02J 7/00 (2006.01)
CPC H02J 7/0014 (2013.01) [H02J 7/0013 (2013.01); H02J 7/0047 (2013.01); H02J 7/0063 (2013.01); H02J 2207/20 (2020.01)] 8 Claims
OG exemplary drawing
 
1. A voltage balancing system for balancing unbalanced battery pack voltage caused by non-cascade of analog front ends, comprising:
a micro control unit;
a low side cell group comprising at least one battery cell;
a low side analog front end arranged in parallel with the low side cell group and configured to acquire an analog voltage of the low side cell group and transmit the analog voltage of the low side cell group to the micro control unit;
a high side cell group comprising at least one battery cell, the high side cell group connecting with the low side cell group in series;
a high side analog front end arranged in parallel with the high side cell group and configured to acquire an analog voltage of the high side cell group and transmit the analog voltage of the high side cell group to the micro control unit, the high side analog front end being not cascaded with the low side analog front end;
a communication isolation module connecting the high side analog front end with the micro control unit, but no another communication isolation module connecting the low side analog front end with the micro control unit; and
a balancing module;
wherein an input of the balancing module is connected to an end which outputs a total voltage of the high side and low side cell groups connected in series, and an output of the balancing module is respectively connected to the micro control unit and the communication isolation module to output an operating voltage to the micro control unit and the communication isolation module;
wherein the low side analog front end communicates with the micro control unit through a low side communication channel; and
the high side analog front end, the communication isolation module and the micro control unit communicate with each other through a high side communication channel, the low side communication channel being isolated with the high side communication channel;
wherein the balancing module is a step-down chip;
wherein when the low side analog end and the high side analog end have no analog-to-digital converters integrated inside, the voltage balancing system further comprises a subtractor, the subtractor comprising a positive input connected to an output of the high side analog front end, a negative input connected to a total positive of the low side analog front end, and an output connected to the micro control unit.