Abstract: The development and spreading process of electric bike fire is studied by carrying out physical combustion test on a ternary lithium battery-electric bicycle，and typical features such as combustion phenomenon, temperature and smoke change are analyzed. The test results show that the e-bike fire develops rapidly, and the combustion process is accompanied by jet fire and explosion phenomena. The fire plume temperature measured at 1 m above the ground could reach up to 730 ℃, which corresponds to a maximum heat release rate of 1 290 kW. By evaluating the toxicity of the smoke, an effective dose percentage (FED) value of 1.8 is calculated, which indicates that about half of the people in this fire environment would be killed due to smoke toxicity hazards. In addition, the generated smoke contains a large amount of flammable and explosive gases, among which H2 content is highest at 2 300 μL/L.

Key words: lithium ternary battery, electric bicycle fire, fire spread, smoke toxicity