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Self-heating reaction and thermal runaway criticality of the lithium ion battery

机译：锂离子电池的自热反应和热失控临界

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摘要

Thermal runaway of lithium ion batteries (LIBs) attracts more and more attentions. In this paper, the self-heating reaction of LIBs with different states of charge (SOCs) is investigated by the standard accelerating rate calorimeter (ARC). The onset temperature of self-heating and trigger temperature of thermal runaway are measured. The kinetics of self-heating reaction is obtained, and the self-accelerating decomposition temperatures (SADTs, i.e. the maximum safe storage temperature) are calculated based on thermal explosion model (Semenov model and Thomas model). The results show that the fully-charged LIB (18650-type, Li(Ni_(0.5)Co_(0.2)Mn_(0.3))O_2/graphite) self-ignites if the storage temperature exceeds 149.6 ℃ under the natural convection condition (the battery surface heat transfer coefficient is 10 W m~(-2) K~(-1)). The logarithmic relationship between SADT and heat dissipation condition suggests that it is effective to reduce the fire risk of LIB by modifying the heat dissipation at low heat transfer coefficient (U), while it becomes inefficient when U is high.
机译：锂离子电池（LIB）的热失控吸引了越来越多的关注。本文通过标准加速量热仪（ARC）研究了不同电荷状态（SOC）的锂离子电池的自热反应。测量自热的起始温度和热失控的触发温度。获得了自加热反应的动力学，并基于热爆炸模型（Semenov模型和Thomas模型）计算了自加速分解温度（SADT，即最高安全储存温度）。结果表明，在自然对流条件下（18650型，Li（Ni_（0.5）Co_（0.2）Mn_（0.3））O_2 /石墨）充满电的LIB会自燃​​（电池表面的传热系数为10 W m〜（-2）K〜（-1））。 SADT与散热条件之间的对数关系表明，通过修改低传热系数（U）时的散热，可以有效降低LIB的着火风险，而当U高时，效率低下。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第3期|119178.1-119178.9|共9页
  • 作者

  • 作者单位

    State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230026 China;

    Shool of Mechanical and Vehicle Engineering Hunan University Changsha 410082 China;

    Warwick FIRE School of Engineering University of Warwick Library Road Coventry CV4 7AL UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lithium ion battery safety; ARC test; Self-heating reaction; SADT; SOC;

    机译：锂离子电池的安全性;ARC测试;自热反应;SADT;SOC;

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