Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (2): 400-408.doi: 10.19799/j.cnki.2095-4239.2020.0010

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Investigation of the performance and safety degradation caused by slight accumulation of electricity in traction batteries

MA Tianyi(), WANG Fang, XU Dapeng, LIN Chunjing, LIU Shiqiang, CHEN Liduo   

  1. China Automotive Technology and Research Center Co. , Ltd. , Tianjin Key Laboratory of Evaluation Technology for Electric Vehicles,Tianjin 300300, China
  • Received:2020-01-05 Revised:2020-01-15 Online:2020-03-05 Published:2020-03-15
  • Contact: Tianyi MA E-mail:wangfang2011@catarc.ac.cn

Abstract:

Because the energy density of lithium-ion (Li-ion) batteries for vehicles and grid storage continues to increase, the safety of Li-ion batteries throughout their life cycle has become the key issue for the continuous development of this technology. Electrical abuse behavior considerably affects the performance and safety of batteries; however, the impact of the slight accumulation of electricity is often ignored because the feedback is not considerable in the short term. This study aimed to investigate the slight over-discharge abuse, which is most likely to be encountered in the practical use of electric vehicles and grid storage, by conducting a “material-battery-performance” multi-level analysis by combining electrochemical testing, tomography analysis, and material characterization technologies. In addition, the effect of mild over-discharge accumulation on the lithium state of the battery was analyzed using neutron imaging technology.

Key words: Li-ion battery, electricity abuse, slight over-discharge, neutron imaging, battery safety

CLC Number: