电源技术2025，Vol.49Issue(4)：755-763,9.DOI:10.3969/j.issn.1002-087X.2025.04.011
基于锂离子电池的在线阻抗监测系统设计
On-line monitoring technology of electrochemical impedance spectros-copy for lithium ion batteries
摘要
Abstract
Electrochemical impedance spectroscopy(EIS)is one of the important parameters reflect-ing the performance of lithium-ion batteries,and the EIS can be used for online assessment of lithium battery working condition and fault warning.For the online monitoring of electrochemical imped-ance spectra of lithium-ion batteries,an EIS online monitoring system based on an embedded micro-controller,a battery management IC and upper computer software,was designed.This system is able to collect the wide-band impedance characteristics of lithium-ion batteries and realize the online mea-surement of AC impedance in the frequency range of 0.12-7 812.52 Hz.The maximum relative imped-ance deviation is only 0.61%(@0.48 Hz)by five repetitive tests on lithium-ion batteries.The EIS static tests of lithium-ion batteries at different SOCs were performed using this system and electro-chemical workstation respectively,and the maximum relative error is only 5.91%(@7 812.52 Hz,30%SOC).Through the dynamic tracking of the battery working conditions,the dynamic curve of EIS during charging and discharging was analyzed,and it is proposed that the amplitude change rate of 0.61 mΩ/s was taken as the threshold value of the battery over-discharge,which can be carried out in advance of 180 s for the early warning of over-discharge.This EIS online monitoring system de-signed has the advantages of data visualization,simple hardware structure,high detection efficiency and low cost,which can be easily integrated into the battery management system(BMS),and has the prospect of application in the online estimation of the state of lithium-ion batteries and early warning of failures.关键词
电化学阻抗谱/阻抗在线监测/故障预警/嵌入式系统/上位机系统Key words
electrochemical impedance spectroscopy/impedance on-line monitoring/fault warning/embedded system/upper computer system分类
信息技术与安全科学引用本文复制引用
张韩召,赵一聪,代兵飞,张勇辉,高鹏..基于锂离子电池的在线阻抗监测系统设计[J].电源技术,2025,49(4):755-763,9.基金项目
2022年国家自然科学基金青年基金项目(62201631) （62201631）
