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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.
Based on the Matlab / Simscape platform, a single battery model was established, and the resistance of the connection between single cells and the input impedance of single-cell voltage sampling in Battery Management System (BMS) charge and SOC.Results show that the single cell connected with a single battery pole during discharging has the lowest SOC and is prone to over-discharge, which is constrained by the set maximum deviation of SOC between single cells The matching range of the resistance value of the connecting piece under the different number of parallel cells in a single cell; the existence of external load leakage leads to the deviation of the single cell SOC; the external load leakage current is analyzed with the voltage sampling input impedance, According to the above, a battery management system security control suggestion is proposed to set up the correction coefficient of battery SOC estimation under different cycles, so as to correct the battery SOC estimation.