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基于电化学阻抗谱特性,对Randles等效电路模型引入复参数电感元件、复参数电容元件和常相位元件,建立磷酸铁锂电池的等效电路修正模型,通过对实测阻抗谱的拟合以及模拟退火算法,辨识修正模型中的参数。拟合结果表明,修正模型相比Randles等效电路模型精度提高近4%,能够更好地模拟电池伏安动态特性,为电池模型在电池管理系统上的进一步应用提供理论基础。
Based on the characteristics of electrochemical impedance spectroscopy, a complex parametric inductance component, a complex parametric capacitance component and a normal phase component are introduced into the Randles equivalent circuit model, and an equivalent circuit correction model of the lithium iron phosphate battery is established. By fitting the measured impedance spectrum and simulating Annealing algorithm to identify the parameters in the modified model. The fitting results show that the accuracy of the modified model is about 4% higher than that of the Randles equivalent circuit model, which can better simulate the dynamic characteristics of the battery voltammetry and provide a theoretical basis for further application of the battery model in the battery management system.