储能科学与技术 ›› 2022, Vol. 11 ›› Issue (2): 690-696.doi: 10.19799/j.cnki.2095-4239.2021.0395

• 储能测试与评价 • 上一篇    下一篇

锂离子电容器自放电检测方法研究

袁玉和, 刘亮, 张洪涛, 衣启正, 张永鹏, 郭延哲, 苑文畅, 李希超   

  1. 中车青岛四方车辆研究所有限公司,山东 青岛 266000
  • 收稿日期:2021-08-02 修回日期:2021-09-27 出版日期:2022-02-05 发布日期:2022-02-08

Study on self-discharge detection method of lithium-ion capacitors

Yuhe YUAN, liang LIU, Hongtao ZHANG, Qizheng YI, Yongpeng ZHANG, Yanzhe GUO, Wenchang YUAN, Xichao LI   

  1. CRRC Qingdao Sifang Rolling Stock Research Institute Limited Company, Qingdao 266000, Shandong, China
  • Received:2021-08-02 Revised:2021-09-27 Online:2022-02-05 Published:2022-02-08

摘要:

自放电是锂离子电容器的一项重要性能指标。基于电化学理论并从实际应用角度出发,本工作研究了锂离子电容器单体在3.8 V和3 V时的电压保持能力(K值),实验发现:锂离子电容器单体在3.8 V时的K值介于0.0037~0.0102 V/d,3 V时的K值介于-0.0003~0.0007 V/d;采用3.8 V时的K值可以更快速地检测单体自放电性能。为进一步提高单体自放电检测效率,本工作基于锂离子电容器自放电机理,还首次提出了一种锂离子电容器单体自放电性能检测方法(漏容量法)。经验证,在检测锂离子电容器单体自放电性能时,电压保持能力法往往需要几十个小时,而漏容量法可以在1 h内完成检测,其自放电检测效率更高。漏容量法在单体自放电检测的工程应用中具有很好的普适性。

关键词: 锂离子电容器, 自放电, 检测方法

Abstract:

Self-discharge is a vital function of lithium-ion capacitors. Based on electrochemical theory and practical application, we study the voltage-holding capacity (K value) of lithium-ion capacitors at 3.8 V and 3 V, the results show that the K value range of lithium ion capacitor is 0.0037~0.0102 V/day at 3.8 V and -0.0003~0.0007 V/day at 3 V. The K value at 3.8 V can be used to detect the self-discharge performance of the cells more efficiency. For the purpose of improve the self-discharge detecting efficiency, and propose a method for detecting the self-discharge performance of lithium-ion capacitors (leakage capacity method) for the first time, verified by experiments. when testing the self-discharge performance of lithium-ion capacitors, the voltage holding capacity method usually needs dozens of hours, while the leakage capacity method can complete the detection within 1 hour, and its self-discharge detection efficiency is higher. The leakage capacity method can quickly and accurately detect and judge the self-discharge performance of lithium-ion capacitors.

Key words: lithium-ion capacitors, self-discharge, detection method

中图分类号: