Research on active equalization of power batteries based on state of charge

doi:10.19799/j.cnki.2095-4239.2021.0420

Abstract

Abstract:

The capacity and other parameters of a single power battery are different, which causes imbalance on charging and discharging, poor performance, and reduced service life of series and parallel power batteries. To solve this problem, an active equalization battery management system based on state of charge (SOC) is designed. After estimating the SOC of a single power battery using the ampere-hour integral method, the battery management system will compare the SOC of the single power battery with the average SOC of the power battery. If the difference value is greater than or less than the set threshold, discharging and charging of the single power batteries will be carried out separately. The validity of the battery management system is verified by simulation through taking four single batteries in series. The simulation results show that the SOC difference values of the single power battery are less than 3% after 3608 s and 1% after 5600 s through active equalization, which greatly reduce the SOC inconsistency of the power batteries.

Key words: power batteries, state of charge, battery management system, active equalization

CLC Number:

U 469

Chunhui LIU, Hongbin REN. Research on active equalization of power batteries based on state of charge[J]. Energy Storage Science and Technology, 2022, 11(2): 667-672.

Figures/Tables 8

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电池单体	SOC初始值/%	容量/(A·h)
电池1	93.46	43.386
电池2	85.67	44.226
电池3	90.5	40.026
电池4	88.64	45.234

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