考虑石墨嵌锂平台的磷酸铁锂电池电化学参数辨识
Identification of Electrochemical Parameters of Lithium Iron Phosphate Battery Considering Lithium Insertion Plateau of Graphite
赵杨梅 1时玮 1张雪楠 1刘彤 1冯翔1
作者信息
- 1. 北京交通大学电气工程学院,北京 100044
- 折叠
摘要
磷酸铁锂电池电压平台反映电池正负极嵌锂能力,为提高电化学参数辨识的精度,特别是电池电压平台期的精度,通过改进的单粒子模型对电池电化学参数进行辨识.同时考虑石墨负极电压平台的特征,形成由电池电压相对误差、电压平台相对误差、总时间误差和电压平台时间差组成的优化目标函数,各目标通过层次分析法赋权值,最后通过模拟退火算法对电化学参数进行辨识.考虑负极石墨电压平台后的电化学参数辨识精度得到提高,电压平台期的电压误差明显减小.
Abstract
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.
关键词
嵌锂平台/磷酸铁锂电池/电化学参数辨识Key words
Lithium insertion plateau/lithium iron phosphate battery/identification of electrochemical parameters引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据