一种串联锂离子电池组P-C-C-P均衡器及其控制方法

doi:10.19562/j.chinasae.qcgc.2022.03.008

Abstract

Abstract:

In view of the problem that there is often an inconsistency in capacity between single cells in a lithium-ion battery pack of electric vehicles， leading to the reduction of the available capacity of battery pack and even greatly shorten its service life， a P-C-C-P equalizer based on flyback transformer is proposed. The equalizer is simple in structure and easy to control. Flyback transformer transmits energy within battery pack， enhancing equalization efficiency. In the process of charging， discharging and stewing of battery pack， three equalization strategies， i.e. pack to cell （P-C）， cell to cell （C-C） and cell to pack （C-P） can be freely selected according to the situations. Each equalization strategy only needs to carry out PWM control on one MOSFET， so the energy loss is small. In this paper， the basic principle and control method of equalizer are presented in detail， and an experimental platform is built to carry out equalization experiments. The results show that the equalizer proposed is feasible.

Key words: lithium-ion battery, inconsistency, equalizer, flyback transformer, equalization experiment

Hongrui Liu,Donghua Gu,Hairui Li,Bin Zhang,Jing Qian. A P-C-C-P Equalizer and Its Control Methods for Lithium-ion Batteries in Series[J].Automotive Engineering, 2022, 44(3): 372-378.

Figures/Tables 13

References 18

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电池	初始SOC/%	充电均衡后SOC/%
1	8.93	74.58
2	13.15	73.19
3	19.48	76.23
4	30.87	76.94

电池	放电均衡后SOC/%
1	16.62
2	16.07
3	16.95
4	16.24

电池	静置均衡后SOC/%
1	16.49
2	16.11
3	16.32
4	16.43

电池	充放电过程后SOC/%
1	10.52
2	14.78
3	22.14
4	30.96

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A P-C-C-P Equalizer and Its Control Methods for Lithium-ion Batteries in Series

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