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锂电池电解液池火火焰状态及其振荡频率特性研究
Research on the Oscillation Frequency and Flame Form of Pool Fire of Lithium Battery Electrolyte

DOI: 10.12677/JSST.2020.81002, PP. 5-12

Keywords: 锂电池电解液，池火，火焰形态，振荡频率
Lithium Battery Electrolyte, The Pool Fire, Flame Form, Oscillation Frequency

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Abstract:

锂电池作为高效、清洁的新能源被广泛使用，然而在其使用过程中由于电池过热引发的电解液着火问题一直被广泛关注。本文以LBC305-01型电解液为燃料，分别针对6 cm、8 cm和10 cm直径的圆盘，开展不同电解液厚度(1 cm, 1.5 cm)的池火燃烧特性实验研究。通过对火焰状态、火焰振荡现象和火焰振荡频率的分析，结果认为火焰在沸腾阶段有明显的卷吸作用，且火焰呈现拉伸、膨胀、分离、破碎等周期性的振荡变化特性。基于傅里叶变换原理对火焰的振荡频率进行分析，得出电解液池火火焰的振荡频率与直径存在线性变换关系：f = 0.307D ？ 0.5。
The lithium battery is widely used as an efficient and clean new energy. However, electrolyte fire caused by battery overheating has been widely concerned during its use. In this paper, the LBC305-01 electrolyte is used as the fuel to carry out experimental studies on the combustion characteristics of different electrolyte thickness (1 cm, 1.5 cm) for pools with diameters of 6 cm, 8 cm and 10 cm, respectively. Through the analysis of flame form, flame oscillation phenomenon and flame oscillation frequency, the results show that the flame has obvious entrainment in the boiling stage, and the flame presents periodic characteristics of oscillation change such as stretching, expansion, separation, and breaking. Through the analysis of flame oscillation fre-quency based on Fourier transform principle, there exists linear interconversion between the flame oscillation frequency and the diameter of the pool fire of electrolyte: f = 0.307D ？ 0.5.

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