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Theoretical analysis of lithium-ion battery failure characteristics under different states of charge

机译：不同充电状态下锂离子电池失效特性的理论分析

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摘要

Lithium-ion batteries (LIBs) are extensively applied in various portable electronic equipment because of their high energy density power. However, accidents related to LIBs frequently occur. This study focuses on failure results, characteristics, and phenomena. Lithium-ion batteries under different states of charge (SOCs) (0%, 30%, 50%, 80%, 100%, and 120%) at high temperatures have been investigated with the thermal abuse test. During the experiments, several typical failure processes were captured. According to the phenomena, 2 failure modes (smoke and jet fire) and 3 stages (primary reaction, tempestuous reaction in the middle time period, and extinguishing reaction in the final stage) were observed. A substantial amount of gas was vented, and jet fire was detected in the middle period. Only gas vented when the SOC was lower than 50%, whereas vented gas and jet fire were detected simultaneously when the SOC exceeded 50%. The results indicated combustible behaviors and exothermic reactions related to the SOC. An increase in the SOC caused a decrease in the thermal runaway initial temperature and the maximum increase in temperature. A higher SOC determined intense chemical reactions in the cell at higher temperatures, which caused a significant amount of materials to spew out of the batteries as well as additional mass loss. Relationships between failure characteristics and internal reactions were analyzed. The SOC should be lower than 50% in transportation or storage. The intercalated lithium capacities were the main reason for the series of domino reactions, which caused runaway in the terminal. These studies can serve as a reference for safety applications, transportation, and loss prevention in LIBs.
机译：锂离子电池（LIB）由于具有高能量密度功率而被广泛应用于各种便携式电子设备中。但是，与LIB相关的事故经常发生。这项研究的重点是失败的结果，特征和现象。通过热滥用测试研究了高温下处于不同充电状态（SOC）（0％，30％，50％，80％，100％和120％）的锂离子电池。在实验过程中，捕获了几种典型的故障过程。根据该现象，观察到了两种失效模式（烟和喷射火）和三个阶段（初次反应，中期的剧烈反应和最后阶段的灭火反应）。大量气体被排出，并且在中期检测到喷射火。当SOC低于50％时，仅排出气体，而当SOC超过50％时，则同时检测到排出的气体和喷射火。结果表明与SOC有关的可燃行为和放热反应。 SOC的增加导致热失控初始温度的降低和温度的最大升高。较高的SOC决定了较高温度下电池中的剧烈化学反应，这导致大量材料从电池中喷涌而出，并导致额外的质量损失。分析了失效特征与内部反应之间的关系。运输或储存中的SOC应低于50％。嵌入的锂容量是一系列多米诺反应的主要原因，多米诺反应导致终端失控。这些研究可以为LIB的安全应用，运输和预防损失提供参考。

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  • 来源
    《Fire and materials》 |2018年第6期|680-686|共7页
  • 作者

    Jiang Fengwei; Liu Kai; Wang Zhirong; Tong Xuan; Guo Linsheng;

  • 作者单位

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing, Jiangsu, Peoples R China;

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

    failure characteristics; lithium-ion batteries; state of charge; theoretical analysis;

    机译：失效特性锂离子电池充电状态理论分析;

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