不同温度与荷电状态下锂离子电池传荷电阻估计

基于锂离子电池伪二维模型并考虑老化机理建立电化学模型,基于该模型提出了在不同荷电状态和温度下传荷电阻折算方法。在4种不同循环老化工况后,通过获取不同温度和荷电状态下的电化学阻抗谱得到相应的传荷电阻,并采用该折算方法进行不同状态下传荷电阻折算,结果表明折算的平均误差小于9%。该折算方法为利用不同温度和荷电状态下的传荷电阻进行电池寿命状态估计提供了新思路。

Estimation of Charge Transfer Resistance of Lithium Ion Battery Under Different Temperature and State of Charge

Combining the pseudo-two-dimensional model and the aging mechanism of the lithium ion battery,an electrochemical model is built.Based on the model,a conversion method of the charge transfer resistance at different state of charge and temperatures is proposed.The corresponding charge transfer resistance is obtained from the electrochemical impedance spectra of different temperatures and state of charge after four different aging cycles and the conversion method is used to convert the charge transfer resistance at different conditions.The results show that the average error of the conversion is less than 9%.It provides a new idea for battery life state estimation by using the charge transfer resistance at different temperatures and state of charge.