• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2019, Vol. 55 ›› Issue (20): 17-27.doi: 10.3901/JME.2019.20.017

Previous Articles     Next Articles

Research Progress on Thermal Runaway Combustion Characteristics of Power Lithiumion Batteries

ZHANG Yajun1, WANG Hewu1, FENG Xuning1, OUYANG Minggao1, ZHOU Anjian2, SU Ling2, YANG Huiqian2   

  1. 1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084;
    2. Chongqing Chang'an New Energy Automobile Technology Co., Ltd., Chongqing 401133
  • Received:2019-03-01 Revised:2019-07-06 Online:2019-10-20 Published:2020-01-07

Abstract: Frequent electric vehicle fire accidents have caused increasing emphasis on the combustion characteristics of power lithium batteries and fire. In the three-stage division of the combustion evolution of the power lithium battery, the first is that the external abuse condition triggers the self-acceleration process of the chemical reaction of the internal material of the battery. As the chemical reaction exothermic accumulation and the produced gas volume increase, the battery is under a certain pressure and the safety valve opens and the battery enters the venting process. Finally, the released gas is ignited by various ignition sources. In fact, in the thermal runaway combustion process of the battery, these three stages are not completely split, which is a complicated juxtaposition phenomenon. Compared with traditional fires, the combustion of power lithium batteries has its particularity. For example, the controlled conditions of combustion involve the heat released by the chemical reaction, the heat generated by the short circuit of the battery power, the combustible component in the battery material system, and the composition of the flammable gas in the battery venting. The evolution of the thermal runaway of the battery, components and concentrations of the venting gas, combustion characteristics of total heat release and heat release rate of battery cells and battery modules, mass loss ratio during the combustion process, fire spread characteristics of the battery pack, extinguishing agent screening principle etc. are reviewed in this paper. On these basis, the shortcomings in the existing research, possible improvement measures and key research points not covered by the research are summarized.

Key words: power lithiumion battery, thermal runaway, vent, combustion, fire strategy

CLC Number: