摘要
锂离子电池尤其是磷酸铁锂电池处于端电压平台阶段时,单体荷电状态与端电压之间无明显联系,仅根据端电压差异无法实现精确的单体均衡控制。针对以上问题,研究提出了基于动力电池模型参数动态预估的单体能量均衡控制策略,依据负载阶跃变化时动力电池端电压变化特性,采用非线性最小二乘法预估单体模型参数,并根据参数差异实现动力电池组的能量均衡控制。结合Buck-Boost结构的能量转换电路,对5节单体组成的锂离子电池组进行均衡试验,单体荷电状态差异约为5%以下,单体能量转换效率达到80%。实验结果说明,文中提出的动力电池组能量均衡控制策略可有效应用于动力电池单体能量的一致性管理。
When the lithium-ion batteries especially lithium iron phosphate batteries are on the terminal voltage platform stage, there is no obvious relationship between the state of charge and the terminal voltage. Therefore it cannot achieve the cell energy equalization according to the terminal voltage. To solve this problem, it proposed cell energy equalization control scheme based on model parameters of power batteries. According to the change characteristics of the terminal voltage during the load step change, the model parameters of power batteries were estimated by non-linear least square method. Based on the differences of these parameters, the energy of cells was transferred from the larger one to the adjacent lower one. Equalization experiment was conducted for battery pack consists of five lithium- ion battery cells combined with the structure of the Buck-Boost converter circuit. The difference of the cells charge state is about 5% or less, and the efficiency of equalizer is about 80% or more. The results verifies that the proposed energy equalization control scheme of power batteries can achieve the energy equalization management for cells.
出处
《电机与控制学报》
EI
CSCD
北大核心
2013年第10期109-114,共6页
Electric Machines and Control
基金
国家自然科学基金(51275367)
中央高校基本科研业务费专项资金资助(2013-v-023)
科技"十二五""863计划项目"(2011AA11A225)
关键词
动力电池
电池模型
电荷状态
参数预估
均衡控制
power batteries
battery model
state of charge
parameters estimation
equalization control
