分析电动汽车电池管理系统的相关技术,提出了基于Thevenin的等效电路模型,并考虑均衡电路影响的电池荷电状态(State of Charge,SOC)算法规则,将测量结果与真实值结果进行比较,验证了改进后的电池组SOC算法满足设计要求,同时针对系统存...分析电动汽车电池管理系统的相关技术,提出了基于Thevenin的等效电路模型,并考虑均衡电路影响的电池荷电状态(State of Charge,SOC)算法规则,将测量结果与真实值结果进行比较,验证了改进后的电池组SOC算法满足设计要求,同时针对系统存在的不足提出改进建议,并对今后的工作进行展望。展开更多
With the rise of the electric vehicle industry,as the power source of electric vehicles,lithium battery has become a research hotspot.The state of charge(SOC)estimation and modelling of lithium battery are studied in ...With the rise of the electric vehicle industry,as the power source of electric vehicles,lithium battery has become a research hotspot.The state of charge(SOC)estimation and modelling of lithium battery are studied in this paper.The ampere-hour(Ah)integration method based on external characteristics is analyzed,and the open-circuit voltage(OCV)method is studied.The two methods are combined to estimate SOC.Considering the accuracy and complexity of the model,the second-order RC equivalent circuit model of lithium battery is selected.Pulse discharge and exponential fitting of lithium battery are used to obtain corresponding parameters.The simulation is carried out by using fixed resistance capacitance and variable resistance capacitor respectively.The accuracy of variable resistance and capacitance model is 2.9%,which verifies the validity of the proposed model.展开更多
文摘分析电动汽车电池管理系统的相关技术,提出了基于Thevenin的等效电路模型,并考虑均衡电路影响的电池荷电状态(State of Charge,SOC)算法规则,将测量结果与真实值结果进行比较,验证了改进后的电池组SOC算法满足设计要求,同时针对系统存在的不足提出改进建议,并对今后的工作进行展望。
基金Project(51507073)supported by the National Natural Science Foundation of China。
文摘With the rise of the electric vehicle industry,as the power source of electric vehicles,lithium battery has become a research hotspot.The state of charge(SOC)estimation and modelling of lithium battery are studied in this paper.The ampere-hour(Ah)integration method based on external characteristics is analyzed,and the open-circuit voltage(OCV)method is studied.The two methods are combined to estimate SOC.Considering the accuracy and complexity of the model,the second-order RC equivalent circuit model of lithium battery is selected.Pulse discharge and exponential fitting of lithium battery are used to obtain corresponding parameters.The simulation is carried out by using fixed resistance capacitance and variable resistance capacitor respectively.The accuracy of variable resistance and capacitance model is 2.9%,which verifies the validity of the proposed model.
