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

摘要/Abstract

摘要：

电动汽车使用的串联锂电池组在多次循环充放电后会出现不均衡的现象,导致电池组容量和寿命的减少。为解决这一问题,文中提出了一种基于附加电池的非能耗式充放电主动均衡方法并对均衡电路及均衡控制策略进行设计。该均衡方案在充电时将电压高的单体能量转移给附加电池,在放电时将附加电池的能量转移给电压低的单体电池,实现了能量的自由存储与转移。文中对均衡电路的原理和均衡控制策略进行了分析,并应用MATLAB/Simulink中的Simcape与Stateflow分别对均衡电路及控制策略进行建模与仿真分析。仿真结果表明,该均衡控制方法能快速实现电池组的均衡,且均衡后的电池组可用容量有明显提高。

关键词: 锂离子电池, 主动均衡, 附加电池, 能量存储, Simulink, 控制策略

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

中图分类号:

TP391.9

周萍,高寒,郑岳久,来鑫,周龙. 一种基于附加电池的锂电池组主动均衡方法[J]. 电子科技, 2019, 32(6): 37-42.

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.

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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