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 frequency 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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