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In recent years, electric vehicle fires and combustion accidents have occurred frequently in China. According to incomplete statistics, there have been more than ten electric vehicle spontaneous combustion incidents in China since the first half of this year, mainly concentrated in the field of electric passenger vehicles. These trains are in a stopped state, charging or in the process of driving.

Frequent fire accidents have occurred, and some experts attribute it to the industry's excessive pursuit of high specific energy density of batteries. Not long ago, Yang Yusheng, an academician of the Chinese Academy of Engineering, pointed out that the high nickel content of the battery has improved the specific capacity, and has also gradually reduced the temperature and safety of the battery under Thermal runaway. The Thermal runaway temperature of the ternary lithium-ion battery is less than 200 ℃, especially when the ternary material decomposes to release extremely active primary oxygen when reaching a certain temperature. Even if there is no external oxygen supply, the battery has complete combustion elements inside, which is also the reason why the flame of the ternary lithium-ion battery spreads rapidly and is difficult to extinguish after the fire.

Yang Yusheng believes that due to the one-sided pursuit of high range pure electric vehicles, the wind of high nickel in ternary materials is becoming stronger and stronger. The ternary battery may be a time bomb, and the Lithium iron phosphate ion battery should not be buried. Other experts believe that theoretically, the safety of ternary batteries is lower than that of Lithium iron phosphate, and increasing the nickel content in ternary batteries will inevitably lead to greater potential safety hazards.

Defects in battery pack design cannot be ignored

The high nickel content of ternary batteries reduces their safety, but as Yang Yusheng said, this is also the reason why the fire spread quickly and was difficult to extinguish after the ternary battery caught fire. So, what is the direct cause of battery fire?

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