摘要
针对锂离子电池充放电过程中电量表征变化幅度大、精度低的问题,提出了一种通过实时分段进行双阈值控制的主被动均衡控制策略。该策略结合锂离子电池开路电压与荷电状态(SOC)的关系曲线,实时分段并合理调整均衡控制方向。通过双阈值的精确调控,提高充放电精度;利用主被动均衡电路中的被动均衡小电流特点,增加单体电池在充放电末期的反应时间,实现准确和安全的电池充放电目的。实验结果表明,锂离子电池组充放电过程中进行分段双阈值主被动均衡控制,可以在电池组充放电速度不变的情况下,提高约2%的充电精度,充电末期稳定减缓电流和电压,证明了控制方法的可行性。
In order to solve the problems of large variation range and low accuracy in charge and discharge process of lithium-ion battery,an active and passive equalization control strategy was proposed by using real-time segmented dual threshold control.The strategy combined the relationship curve between open circuit voltage and state of charge(SOC)of Li-ion battery,and adjusted the equalization control direction in real time.Through the precise control of double threshold,the accuracy of charge and discharge was improved.By using the characteristics of passive balance small current in active and passive balance circuit,the reaction time of single battery at the end of charge and discharge was increased,so as to achieve the accurate and safe purpose of battery charge and discharge.The experimental results show that the double threshold active and passive equalization control can improve the charging accuracy by about 2%when the charging and discharging speed of the lithium-ion battery is constant,and slow down the current and voltage stably at the end of charging,which proves the feasibility of the control method.
作者
单恩泽
王鹿军
SHAN Enze;WANG Lujun(Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System,Hubei University of Technology,Wuhan 430068,Hubei,China)
出处
《电气传动》
2021年第11期40-47,共8页
Electric Drive
基金
国家自然科学基金青年项目(51607060)。
关键词
锂离子电池
电量表征
实时分段
双阈值
主被动均衡
lithium-ion battery
electricity characterization
real-time segmentation
double threshold
active and passive equilibrium
