一种基于附加电池的锂电池组主动均衡方法

doi:10.16180/j.cnki.issn1007-7820.2019.06.008

Abstract

Abstract:

The series lithium batteries used in electric vehicles will be unbalanced after repeated charge and discharge, resulting in the decrease of battery capacity and life span. In this paper, a non-energy consumption active equalization method based on additional battery was proposed, and the balanced circuit and the equilibrium control strategy were designed. The equalization scheme transferred the energy of the high voltage cell to the additional battery during charging, and further transferred the power of the additional battery to the low voltage cell when discharging, which realized the free storage and transfer of the energy. The principle of equalization circuit and the equilibrium control strategy were analyzed, and the Simcape and Stateflow in MATLAB/Simulink were used to model and simulate the equilibrium circuit and control strategy, respectively. The simulation results showed that the equilibrium control method could realize the equilibrium of the battery pack quickly, and the usable capacity of the battery was improved obviously.

Key words: lithium-ion battery, active equalization, additional battery, energy storage, Simulink, control strategy

CLC Number:

TP391.9

ZHOU Ping,GAO Han,ZHENG Yuejiu,LAI Xin,ZHOU Long. An Active Equalization Method for Lithium-ion Battery Pack Based on Additional Battery[J].Electronic Science and Technology, 2019, 32(6): 37-42.

Figures/Tables 12

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References 18

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	Cell₁	Cell₂	Cell₃	Cell₄	Cell₀
额定容量/Ah	24×0.9	24×0.85	24	24	12
初始SOC/%	95	98	85	100	65

An Active Equalization Method for Lithium-ion Battery Pack Based on Additional Battery

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