考虑石墨嵌锂平台的磷酸铁锂电池电化学参数辨识OA北大核心

The voltage plateau of a lithium iron phosphate battery reflects the lithium insertion capacity of positive and negative electrodes of the battery.To improve the identification accuracy of electrochemical parameters,especially the accuracy of battery voltage plateau,the electrochemical parameters of the battery are identified through an improved single-particle model.At the same time,considering the characteristics of voltage plateau of graphite anode,an optimization objective function consisting of the relative error of battery voltage,relative error of voltage plateau,total time error and the time difference in voltage plateaus is formed,and each objective is weighted by the analytic hierarchy process.Finally,the electrochemical parameters are identified using the simulated annealing algorithm.The identification accuracy of electrochemical parameters after considering the voltage plateau of graphite anode is improved,and the voltage error during the voltage plateau period is obviously reduced.