电池2018，Vol.48Issue(1)：8-12,5.DOI:10.19535/j.1001-1579.2018.01.003
基于时频分析的锂离子电池阻抗计算方法
Measuring method of Li-ion battery impedance based on time-frequency analysis
摘要
Abstract
The wavelet theory was applied to the calculation of the battery impedance.The impedance at the frequency of 0.031 6 -794.328 2 Hz of the battery could be calculated under 50 s discharge process.At the same time,the effects of different discharge currents on the results were studied.It was found that the low-frequency part of the battery impedance calculated was kept in good accordance with electrochemical impedance spectroscopy(EIS),but the high frequency was affected by the signal-to-noise ratio,in the small discharge current case.When the discharge current was increased,the signal-to-noise ratio and the accuracy of the medium-high-frequency impedance part were improved.A certain deviation was caused in the low-frequency part of the impedance because of the non-linearity diffusion process of the battery.Taking medium-high-frequency impedance as the research object,it was found that the impedance of the medium-high-frequency part was not affected by the output current at the same state of charge(SOC) and temperature.Through 700 times cycle test of the battery,it was found that the impedance of the medium-high-frequency impedance of the battery was related to state of health(SOH).关键词
锂离子电池/电化学阻抗谱(EIS)/阻抗测量/小波变换Key words
Li-ion battery/electrochemical impedance spectroscopy(EIS)/impedance measurement/wavelet transform分类
信息技术与安全科学引用本文复制引用
张珺涵,王学远,魏学哲..基于时频分析的锂离子电池阻抗计算方法[J].电池,2018,48(1):8-12,5.基金项目
国家自然科学基金(51576142) （51576142）
