主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2020, Vol. 39 ›› Issue (5): 709-712.

• • 上一篇    下一篇

锂离子电池交流阻抗热失控变化规律研究

赵启臣，张青松   

  1. 中国民航大学 飞机防火与应急研究所，天津 300300
  • 出版日期:2020-05-15 发布日期:2020-05-15
  • 通讯作者: 张青松(1977-)，男，中国民航大学经济与管理学院教授，博士。
  • 作者简介:赵启臣(1996-)，男，中国民航大学经济与管理学院硕士研究生，主要从事锂电池失效状态监测技术研究，天津市东丽区津北公路2898号，300300。
  • 基金资助:
    民航安全能力建设项目（TRSA-20600726）；中央高校基本科研业务费中国民航大学专项（3122018D043）

Study on the change regulation of ac impedance in the thermal runaway process of lithium ion battery

ZHAO Qi-chen, ZHANG Qing-song   

  1. Aircraft Fire and Emergency Research Institute,Civil Aviation University of China, Tianjin 300300, China
  • Online:2020-05-15 Published:2020-05-15

摘要： 利用自主设计的交流阻抗监测锂离子电池热失控平台，对锂离子电池热滥用过程中阻抗变化规律进行研究。基于交流阻抗技术与锂离子电池热失控机理，分析了锂离子电池热滥用过程中阻抗、相位角、欧姆内阻、极化内阻及电压随电池表面温度的变化。结果表明：锂离子电池在热滥用过程中，阻抗会先减小并在电池断路前几分钟快速增长，电池电压保持稳定直至电池断路；相位角在加热中会减小然后保持稳定。18650型锂离子电池阻抗主要受欧姆内阻影响。锂离子电池极化内阻能在电池断路前保持稳定，说明正极材料在此阶段没有发生化学反应。

关键词: 锂离子电池, 交流阻抗, 热失控, 早期预警

Abstract: Through the self-designed ac impedance monitoring platform for thermal runaway of lithium ion battery, the impedance change rule in the process of thermal abuse of lithium ion battery was studied. Based on ac impedance technology and thermal runaway mechanism of lithium ion battery, the changes of impedance, phase Angle, ohmic resistance, polarization resistance and voltage with the surface temperature of lithium ion battery during thermal abuse were analyzed. The results show that in the process of heat abuse, the impedance of the lithium ion battery first decreases and then increases rapidly several minutes before the battery is disconnected, and the battery voltage remains stable until the battery is disconnected. The phase angle is going to decrease in the heat and then it's going to be stable. The impedance of 18650 lithium ion battery is mainly affected by ohmic resistance. The polarization resistance of lithium ion battery is stable before the battery breaks, which proves that there is no chemical reaction in the positive electrode material at this stage.

Key words: lithium ion batteries, ac impedance, thermal runaway, early warning