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Breakdown of Electric Vehicle Fire Cases

The breakdown statement of electric vehicle fire cases states that most of the causes of the fire are due to thermal runaway of power lithium-ion batteries. By decomposing the ignition time of a certain type of electric vehicle within a year, it was found that in the hot May August period, more than 52% of the total number of ignition cases occurred. High environmental temperature is one of the factors causing ignition of power lithium-ion batteries; According to the statistics of the vehicle operation status in the electric vehicle fire case, it was found that the proportion of fires during charging is 68%, the proportion of fires during driving is 20%, and the proportion of fires during stationary and other situations is 12%.

Thermal runaway activation system for 2-power lithium-ion batteries

The use process of electric vehicles is the charging and discharging cycle of lithium-ion batteries, which involves complex chemical reactions. Due to the thermal stability of the SEI film on the negative electrode surface, thermal analysis occurs when the temperature reaches 120-140 ℃. SEI film analysis will expose the negative electrode and make it come into direct contact with the electrolyte, causing a violent reduction reaction and releasing a large amount of combustible gas, while also releasing a large amount of heat.

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