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不同初始条件下锂离子电池排气气体燃烧极限的研究

Study on the Flammability Limits of Lithium-Ion Battery Vent Gas under Different Initial Conditions.

作者信息

Ma Biao, Liu Jie, Yu Ruiguang

机构信息

Department of Power Mechanical Engineering, Beijing Jiaotong University, Beijing 100044, PR China.

Beijing Key Laboratory of New Energy Vehicle Powertrain Technology, Beijing Jiaotong University, Beijing 100044, PR China.

出版信息

ACS Omega. 2020 Oct 22;5(43):28096-28107. doi: 10.1021/acsomega.0c03713. eCollection 2020 Nov 3.

DOI:10.1021/acsomega.0c03713
PMID:33163792
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7643196/
Abstract

In this paper, the flammability limit of the battery thermal runaway vent gas (BVG) is studied numerically by using the CHEMKIN 2.0 code. The research content mainly includes the change of flammability limit with the state of charge, initial temperature, and initial pressure. The chemical reaction kinetics at the flammability limit is also analyzed. The results show that the flammability limit obtained by numerical simulation is in good agreement with that calculated by Le Chatelier's mixing rule. The lean and rich limits increase with the increase of the initial pressure, and the increasing trend gradually slows down. As for the change of initial temperature, higher the temperature is, wider the limits are. In addition, according to the simulation results, the fitting formula of the flammability limit changing with the initial conditions is given. Furthermore, in order to reveal the important elementary reactions controlling the flammability limit, the sensitivity analysis with respect to the flame speed and heat release rate analysis of the elementary reactions are carried out at the flammability limit. Finally, the effect of CO and H content on the flammability limit of BVG is discussed.

摘要

本文利用CHEMKIN 2.0程序对电池热失控排气（BVG）的可燃极限进行了数值研究。研究内容主要包括可燃极限随荷电状态、初始温度和初始压力的变化。还分析了可燃极限下的化学反应动力学。结果表明，数值模拟得到的可燃极限与用勒夏特列混合规则计算得到的结果吻合良好。贫燃极限和富燃极限随初始压力的增加而增大，且增大趋势逐渐减缓。至于初始温度的变化，温度越高，极限范围越宽。此外，根据模拟结果，给出了可燃极限随初始条件变化的拟合公式。此外，为了揭示控制可燃极限的重要基元反应，在可燃极限下对火焰速度进行了敏感性分析，并对基元反应的热释放率进行了分析。最后，讨论了CO和H含量对BVG可燃极限的影响。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/fdc4594d4f99/ao0c03713_0014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/fdc4594d4f99/ao0c03713_0014.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/2394eee1ba3f/ao0c03713_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/4a9db7efb830/ao0c03713_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/595600729425/ao0c03713_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/6bef1be86d9a/ao0c03713_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/29cbca2279d2/ao0c03713_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/554247348ebb/ao0c03713_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/545c72766a0d/ao0c03713_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/5b369f942f51/ao0c03713_0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/b0f86e1df56e/ao0c03713_0010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/669bc0b1c860/ao0c03713_0011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/99cac7de7a53/ao0c03713_0012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/86fc/7643196/fdc4594d4f99/ao0c03713_0014.jpg

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Flammability and Propagation Dynamics of Planar Freely Propagating Dimethyl Ether Premixed Flame.
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The combustion behavior of large scale lithium titanate battery.大规模钛酸锂电池的燃烧行为
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