侯林涛, 张彩萍, 蔡雪, 郑许林, 柏晶晶, 范茂松. 基于阻抗谱重构技术的电池健康状态快速估计方法[J]. 全球能源互联网, 2024, 7(2): 145-154. DOI: 10.19705/j.cnki.issn2096-5125.2024.02.004
引用本文: 侯林涛, 张彩萍, 蔡雪, 郑许林, 柏晶晶, 范茂松. 基于阻抗谱重构技术的电池健康状态快速估计方法[J]. 全球能源互联网, 2024, 7(2): 145-154. DOI: 10.19705/j.cnki.issn2096-5125.2024.02.004
HOU Lintao, ZHANG Caiping, CAI Xue, ZHENG Xulin, BAI Jingjing, FAN Maosong. A Fast Estimation Method of Battery State of Health Based on Impedance Spectroscopy Reconstruction Technique[J]. Journal of Global Energy Interconnection, 2024, 7(2): 145-154. DOI: 10.19705/j.cnki.issn2096-5125.2024.02.004
Citation: HOU Lintao, ZHANG Caiping, CAI Xue, ZHENG Xulin, BAI Jingjing, FAN Maosong. A Fast Estimation Method of Battery State of Health Based on Impedance Spectroscopy Reconstruction Technique[J]. Journal of Global Energy Interconnection, 2024, 7(2): 145-154. DOI: 10.19705/j.cnki.issn2096-5125.2024.02.004

基于阻抗谱重构技术的电池健康状态快速估计方法

A Fast Estimation Method of Battery State of Health Based on Impedance Spectroscopy Reconstruction Technique

  • 摘要: 电池健康状态(state of health,SOH)是保证系统安全稳定运行的关键,健康状态估计不准将影响电池的使用性能,甚至引发电池滥用等问题。电池电化学阻抗谱通过宽频范围内电池的阻抗特征来反映其内部的电化学过程,蕴含了大量电池老化信息,已经逐渐成为分析锂离子电池性能的有力工具。然而,传统的电池阻抗谱测试方法耗时长、成本高昂。为此,以实现锂离子电池的精细化检测与健康状态快速评估为目标,围绕基于电化学阻抗谱重构技术的电池健康状态估计方法展开研究。通过逆重复最大长度序列设计多频电流激励信号,实现了电池阻抗谱的快速测试。采用连续小波变换开展阻抗谱重构,从而获取目标频率范围内的电池阻抗信息,整个过程耗时小于4.5 min。通过不同老化状态电池在特殊频率点下的重构阻抗幅值建立经验模型,实现了电池健康状态的快速准确评估。

     

    Abstract: Battery state of health(SOH) is the key to ensure the safe and stable operation of the system, and inaccurate state of health estimation will affect the performance of the battery, and even lead to problems such as battery abuse. Electrochemical impedance spectroscopy has become a powerful tool for analyzing the performance of lithium-ion batteries because it reflects the internal electrochemical processes through the impedance characteristics of the battery in a wide frequency range, which contains a large amount of information about the aging of batteries. However, the traditional impedance spectroscopy testing method is time-consuming and costly.Therefore, to achieve the fine detection and rapid assessment of the health state of lithium-ion batteries, this paper focuses on the battery state of health estimation method based on electrochemical impedance spectroscopy reconstruction technology. Based on the inverse repetitive maximum length sequence design of multi-frequency current excitation signal,the rapid test of battery impedance spectroscopy is achieved.The impedance spectroscopy reconstruction is carried out by continuous wavelet transform, and the battery impedance information within the target frequency range is obtained, and the whole process consumes less than 4.5 min. An empirical model is established by the amplitude of reconstructed impedance of batteries with different aging states at special frequency points, and a rapid and accurate evaluation of the battery state of health is realized.

     

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