Analysis and Improvement of Single Cell Voltage Detection for High-Voltage Battery Packs

doi:10.16628/j.cnki.2095-8188.2026.03.003

Abstract

Abstract:

To address the issues of high leakage current and short storage time in high-voltage battery pack cell voltage detection,a floating ground voltage detection scheme is proposed.The design method of the floating ground voltage detection circuit is introduced in detail,and the leakage current of the battery pack is calculated theoretically,which reduces the individual cell leakage current from 3.3 mA to 0.83 mA.A simulation platform is built using Saber software to simulate the leakage current,and the results are compared with the calculated current for verification,providing a theoretical basis for subsequent product design.This achieves the voltage detection of high-voltage battery cells with minimal leakage current, meeting the requirements for the long-term operation and storage of battery packs.

Key words: high-voltage battery pack, single cell voltage detection, floating ground voltage detection, leakage current

CLC Number:

TM911

WANG Yubao, LI Renjie, QIN Siming, XU Qifeng, LIU Wanting. Analysis and Improvement of Single Cell Voltage Detection for High-Voltage Battery Packs[J]. LOW VOLTAGE APPARATUS, 2026, 0(3): 17-22.

Figures/Tables 8

References 12

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单体序号	单体电压/V	漏电流/mA
1	4.1	3.311 829
2	4.1	3.291 868
3	4.1	3.251 408
4	4.1	3.190 447
5	4.1	3.108 987
6	4.1	3.007 062
7	4.1	2.884 566
8	4.1	2.741 605
9	4.1	2.578 145
10	4.1	2.394 184
11	4.1	2.189 742
12	4.1	1.964 763
13	4.1	1.719 303
14	4.1	1.453 342
15	4.1	1.166 882
16	4.1	0.859 921
17	4.1	0.532 461
18	4.1	0.184 500

单体序号	单体电压/V	漏电流/mA
1	4.1	0.092 519
2	4.1	0.256 519
3	4.1	0.400 018
4	4.1	0.523 018
5	4.1	0.625 517
6	4.1	0.707 517
7	4.1	0.769 016
8	4.1	0.810 016
9	4.1	0.830 515
10	4.1	0.830 524
11	4.1	0.810 024
12	4.1	0.769 023
13	4.1	0.707 523
14	4.1	0.625 522
15	4.1	0.523 022
16	4.1	0.400 021
17	4.1	0.256 521
18	4.1	0.092 520

单体序号	单体电压/V	漏电流/mA
1	4.1	0.092 52
2	4.1	0.256 52
3	4.1	0.400 02
4	4.1	0.523 02
5	4.1	0.625 52
6	4.1	0.707 52
7	4.1	0.769 02
8	4.1	0.810 02
9	4.1	0.830 52
10	4.1	0.830 52
11	4.1	0.810 02
12	4.1	0.769 02
13	4.1	0.707 52
14	4.1	0.625 52
15	4.1	0.523 02
16	4.1	0.400 02
17	4.1	0.256 52
18	4.1	0.092 52

单体序号	单体电压/V	均衡电阻/kΩ	加均衡电阻后漏电流/mA
1	4.1	6.2//56	0.827 02
2	4.1	8.2//56	0.827 93
3	4.1	11//75	0.827 41
4	4.1	16//82	0.829 27
5	4.1	24//120	0.830 52
6	4.1	47//120	0.828 92
7	4.1	100//200	0.830 52
8	4.1	330//510	0.830 48
9	4.1	—	0.830 52
10	4.1	—	0.830 52
11	4.1	330//510	0.830 48
12	4.1	100//200	0.830 52
13	4.1	47//120	0.828 92
14	4.1	24//120	0.830 52
15	4.1	16//82	0.829 27
16	4.1	11//75	0.827 41
17	4.1	8.2//56	0.827 93
18	4.1	6.2//56	0.827 02