Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (8): 2519-2525.doi: 10.19799/j.cnki.2095-4239.2022.0177

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Effects of state of charge and battery layout on thermal runaway propagation in lithium-ion batteries

Qingsong ZHANG(), Yang ZHAO, Tiantian LIU   

  1. Center for Aircraft Fire and Emergency, Civil Aviation University of China, Tianjin 300300, China
  • Received:2022-03-07 Revised:2022-03-28 Online:2022-08-05 Published:2022-08-03
  • Contact: Qingsong ZHANG E-mail:nkzqsong@126.com

Abstract:

Currently, studies on the thermal runaway propagation characteristics of lithium-ion batteries mainly focus on the battery shape and trigger mode. This study uses a self-developed lithium-ion battery array cascade thermal-runaway experimental platform to investigate the thermal runaway propagation characteristics of lithium-ion batteries using different states of charge (SOC) and arrangement intervals. The results show that the rate of thermal runaway propagation decreases with a decrease in SOC. The total duration of thermal runaway propagation in a 70%SOC battery pack is 70 seconds longer than that in a 100%SOC battery pack. The maximum thermal runaway propagation temperature in a 100%SOC battery pack can reach 621.81 ℃, and no thermal runaway propagation occurs in a 50%SOC battery pack. For batteries with 100%SOC, the larger the transverse spacing between batteries, the more difficult it is for a thermal runaway to spread between battery packs. Thermal runaway will not spread in battery packs when the transverse spacing between batteries is 3 mm. The thermal runaway between batteries mainly propagates in a layer-by-layer approach. The research has a high application value for optimizing battery layout and preventing and controlling battery thermal runaway propagation.

Key words: lithium-ion battery, state of charge, battery layout, thermal runaway propagation

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