等效电路
拉普拉斯变换
锂离子电池
过电位
Padé逼近
电池(电)
电压
内阻
电化学
控制理论(社会学)
计算机科学
电子工程
电极
数学
化学
应用数学
工程类
电气工程
数学分析
物理
热力学
功率(物理)
物理化学
人工智能
控制(管理)
作者
Xi Zhang,Jinling Lu,Shifei Yuan,Jun Yang,Xuan Zhou
标识
DOI:10.1016/j.jpowsour.2017.01.126
摘要
Abstract This paper proposes a novel parameter identification method for the lithium-ion (Li-ion) battery equivalent circuit model (ECM) considering the electrochemical properties. An improved pseudo two-dimension (P2D) model is established on basis of partial differential equations (PDEs), since the electrolyte potential is simplified from the nonlinear to linear expression while terminal voltage can be divided into the electrolyte potential, open circuit voltage (OCV), overpotential of electrodes, internal resistance drop, and so on. The model order reduction process is implemented by the simplification of the PDEs using the Laplace transform, inverse Laplace transform, Pade approximation, etc. A unified second order transfer function between cell voltage and current is obtained for the comparability with that of ECM. The final objective is to obtain the relationship between the ECM resistances/capacitances and electrochemical parameters such that in various conditions, ECM precision could be improved regarding integration of battery interior properties for further applications, e.g., SOC estimation. Finally simulation and experimental results prove the correctness and validity of the proposed methodology.
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