集成方式对磷酸铁锂电池组SOC间偏差的影响

发布时间：2018-01-31 01:10

本文关键词： 仿真模型连接片阻值输入阻抗外载漏电流 SOC偏差安全控制　出处：《应用基础与工程科学学报》2016年03期 　论文类型：期刊论文

【摘要】：基于Matlab/Simscape平台建立了单体电池模型,模拟分析了单体电池间连接片阻值及电池管理系统(Battery Management System,BMS)中单节电池电压采样输入阻抗对电池荷电状态(State of charge,SOC)间差异的影响.结果表明,放电过程中与单节电池极柱相连的单体电池SOC最低,易出现过放现象,以设定的单体电池间SOC最大偏差为约束,讨论了单节电池内部不同并联电池数目下连接片阻值的匹配范围;外载漏电流的存在导致单节电池SOC间存在偏差,分析了外载漏电流随电压采样输入阻抗、模组间串联电池数的变化规律,据此提出了建立不同循环次数下的电池组SOC估算偏差修正系数,从而对电池组SOC估算值予以修正的电池管理系统安全控制建议.
[Abstract]:The single cell model is established based on Matlab/Simscape platform. The battery Management System was simulated and analyzed. The effect of the input impedance of single cell voltage sampling on the difference between the state of charge and SOCs in the charged state of the cell in BMS. During the discharge, the SOC of single cell connected with single pole column is the lowest, which is easy to overdischarge. The maximum deviation of SOC between single cell is the constraint. The matching range of patch resistance under different numbers of parallel cells within a single cell is discussed. The leakage current of external load leads to the deviation between SOC of single battery. The variation rule of input impedance of external load leakage current with voltage sampling and the number of series cells between modules are analyzed. Based on this, the paper puts forward some suggestions for the safety control of battery management system based on the establishment of correction coefficient of SOC estimation deviation of battery pack under different cycles, and the modification of SOC estimation value of battery pack.
【作者单位】：江苏大学汽车工程研究院;山东大学能源与动力工程学院;
【基金】：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) 国家新能源汽车产业技术创新工程江苏高校优势学科建设工程资助项目
【分类号】：U469.72
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