20 Ah LiFePO4电池燃烧过程及温度特性研究

doi:10.16265/j.cnki.issn1003-3033.2018.11.009

中国安全科学学报 ›› 2018, Vol. 28 ›› Issue (11): 53-58.doi: 10.16265/j.cnki.issn1003-3033.2018.11.009

20 Ah LiFePO₄电池燃烧过程及温度特性研究

王爽, 杜志明^**教授, 张泽林

北京理工大学爆炸科学与技术国家重点实验室,北京 100081

收稿日期:2018-08-15 修回日期:2018-10-12 出版日期:2018-11-28 发布日期:2020-11-25
通讯作者: ** 杜志明(1962—),男,山西忻州人,博士,教授,博士生导师,主要从事锂离子电池燃爆危险性及消防技术的研究。E-mail:duzhiming430@sohu.com。
作者简介:王爽 (1993—),男,黑龙江安达人,硕士研究生,研究方向为锂离子电池燃烧爆炸危险性。E-mail:wangxss810@163.com。
基金资助:
北京理工大学爆炸科学与技术国家重点实验室资助项目(ZDKT17-03)。

Study on combustion process and temperature characteristics of 20 Ah LiFePO₄ battery

WANG Shuang, DU Zhiming, ZHANG Zelin

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Received:2018-08-15 Revised:2018-10-12 Online:2018-11-28 Published:2020-11-25

摘要/Abstract

摘要： 为预防磷酸铁锂(LiFePO₄)电池热失控事故,在燃烧试验箱中开展20 Ah LiFePO₄电池热失控试验,分析其在3种荷电状态(SOC)下的燃烧过程、温度特性、质量和电压变化;分析射流火焰演化过程,探讨SOC对电池表面温度、火焰温度和质量损失的影响,并划分电池的电压变化阶段。结果表明:20 Ah LiFePO₄电池燃烧过程中,热失控会发生2次,且第2次热失控危险性更高;最多会形成5次射流火焰并伴随有火焰推举现象;随着SOC的增加电池表面温度、失重、火灾危险性和质量损失速率越来越大,燃烧持续时间与SOC成反比; SOC对热失控发生时表面不同位置处的温度、火焰温度和电压影响不大。

关键词: 磷酸铁锂(LiFePO₄)电池, 热失控, 荷电状态(SOC), 燃烧过程, 温度特性, 质量损失, 电压变化

Abstract: To prevent LiFePO₄ battery thermal runaway accidents, thermal runaway tests of 20 Ah LiFePO₄ battery were carried out in a combustion test chamber. Its combustion process, temperature characteristics, mass and voltage changes under three SOC were studied. The evolution of the jet flame was analyzed. The effects of SOC on surface temperature, flame temperature and mass loss were studied. And the phases of voltage change during thermal runaway were identified. The results show that during the combustion process, the thermal runaway process occurs twice, and the second thermal runaway process is more dangerous, that at most 5 jet flames are formed accompanied by flame liftoff, that as the SOC increases, the surface temperature, mass loss, fire risk and mass loss rate become larger, the combustion duration is inversely proportional to the SOC, that SOC has only a marginal effect on the temperature at different locations on the surface when thermal runaway occurs, and that the effect of SOC on both flame temperature and voltage is not significant.

Key words: lithium iron phosphate (LiFePO₄) battery, thermal runaway, state of charge(SOC), combustion process, temperature characteristics, mass loss, voltage change

中图分类号:

X932

王爽, 杜志明, 张泽林. 20 Ah LiFePO₄电池燃烧过程及温度特性研究[J]. 中国安全科学学报, 2018, 28(11): 53-58.

WANG Shuang, DU Zhiming, ZHANG Zelin. Study on combustion process and temperature characteristics of 20 Ah LiFePO₄ battery[J]. China Safety Science Journal, 2018, 28(11): 53-58.

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20 Ah LiFePO₄电池燃烧过程及温度特性研究

Study on combustion process and temperature characteristics of 20 Ah LiFePO₄ battery

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