Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (2): 647-657.doi: 10.19799/j.cnki.2095-4239.2020.0358

• Energy Storage Test: Methods and Evaluation • Previous Articles     Next Articles

A review of current research on the formation mechanism of lithium batteries

Haobin LIANG1,2(), Jianhua DU1,2(), Xin HAO1,2, Shizhi YANG1,2, Ran TU1,2, Rencheng ZHANG1,2   

  1. 1.Key Laboratory of Process Monitoring and System Optimization for Mechanical and Electrical Equipment, Huaqiao University
    2.College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, Fujian, China
  • Received:2020-11-05 Revised:2021-01-04 Online:2021-03-05 Published:2021-03-05

Abstract:

Lithium batteries undergo chemical reactions and material deformation all the time during use, causing their shape to continue to change with the state of use. Both hard- and soft-shell materials of lithium batteries have a certain degree of ductility. In early stages of thermal runaway of lithium batteries, a series of physical and chemical changes will create pressure inside the lithium batteries. As time goes by, lithium batteries will swell significantly, causing significant pressure changes between battery cells. Therefore, studying the mechanism of lithium battery expansion is extremely important for early detection and early warning of thermal runaway of lithium batteries. This article reviews the research on the expansion and formation mechanisms of lithium batteries at home and abroad, sums up the main reasons for the expansion of lithium batteries, and starts from five aspects of lithium battery electrode materials, electrolyte, charge and discharge temperature, charge and discharge voltage, and charge and discharge current. We analyzed their impact on the expansion of lithium batteries. Finally, through the research results of various influencing factors, future methods and directions for controlling gas swelling of lithium batteries are explored, and more effective early warning suggestions are put forward for the early detection and early warning systems of lithium battery thermal runaway.

Key words: lithium battery, expansion, pressure deformation, early warning

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