磷酸铁锂并联电池组充电安全性界定  

Defining of charge safety of LiFePO_4 in-parallel battery

作　　者：王丽梅[1] 盘朝奉[1] 刘良[1] WANG Li-mei;PAN Chao-feng;LIU Liang(Automotive Engineering Research Institute, Jiangsu University,Zhenjiang Jiangsu 212013, China)

机构地区：[1]江苏大学汽车工程研究院,江苏镇江212013

出　　处：《电源技术》2017年第12期1709-1711,1791,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51402129);江苏省自然科学基金(BK20160529);国家博士后科学基金(2016M591775);江苏大学高级人才科研启动基金(15JDG165;13JDG073)

摘　　要：基于Matlab/Simscape平台开发了磷酸铁锂单体电池模型,据此建立了不同拓扑结构的电池组模型,分析了单体电池老化对并联电池组性能的影响。结果表明,与老化单体电池并联的单体电池荷电状态上升速率高于其余单体电池,以单节电池安全为约束的充电模式将导致其内部并联单体电池出现过充电。为保证并联单体电池充电安全,单节电池充电截止电压需依据电池老化状态重新界定,且实际使用过程中,可忽视充电电流对单节电池充电截止电压的影响。在此基础上,提出了仅考虑并联单体电池数,以极限状态下的充电截止电压控制充电过程,确保并联电池组充电安全的理念。The LiFePO4cell model was developed based on Matlab/Simscape platform.The cell model was used to construct different types of battery models,and the battery models were used to analyze the influence of the cell aging on the in-parallel batteries'performance.The simulation results indicate that some in-parallel battery cells are over-charged when the battery management system(BMS)only sets the battery module safety as constraint.The battery safety end-of-charge(EOC)voltage is related to the aging state of the battery.And the effect of the charging current on the safety EOC voltage can be neglected.The safety EOC voltage can be set according to the EOC voltage in the limit state only considering the cell number of in-parallel battery.

关 键 词：电池老化 充电截止电压 并联电池安全 极限状态 

分 类 号：TM912[电气工程—电力电子与电力传动]