Since May, China's new energy vehicle market share has exceeded 30% for 6 consecutive months, and the popularity is getting higher and higher. However, the spontaneous combustion and runaway incidents of the tram have occurred one after another, almost never stopped, making a large number of consumers doubt the safety of the tram. So the safety of the tram is really not as good as that of the petrol car?
According to incomplete statistics, there will be more than 3,000 domestic electric car incidents in 2021, and the probability of fire is about 003%+, while the annual fire accident rate of traditional fuel vehicles is 001%-0.02%。
Spontaneous combustion of a tram** is nothing more than damage to the car's battery, resulting in thermal runaway or a short circuit, and then spontaneous combustion. At present, the mainstream batteries are ternary lithium batteries and lithium iron phosphate batteries. Lithium batteries contain a large amount of electrolyte used to exchange ions, and the electrolyte of ternary lithium-ion batteries is particularly active. The battery pack is assembled from a single small battery cell, and after a collision or bump into the battery pack, each cell squeezes and collides with each other, and the electrolyte is very easy to burn. And with the rapid development of new energy vehicles, in order to improve the battery life of the vehicle, the battery density has to be increased, but its stability has also decreased. 
The lithium iron phosphate battery is a lithium-ion battery that uses lithium iron phosphate as the cathode material and carbon as the anode material, which is not easy to be decomposed at a high temperature of more than 200 degrees Celsius, and the overall safety and stability are higher, but if the temperature reaches more than 500 degrees, it may lead to a large amount of heat generation, resulting in the rupture of the explosion-proof film of the battery cell, and the electrolyte is sprayed out, and there will still be a risk of **. 
This makes the probability of spontaneous combustion of the tram much greater than that of the oil car, and the reason for the spontaneous combustion of the oil car is mostly related to maintenance, modification, oil leakage, and the placement of flammable materials in the car, for example, when the fuel leaks, the mixture reaches a certain concentration, if there is an open flame, it will lead to a spontaneous combustion accident, that is, the spontaneous combustion of the fuel vehicle is likely to be avoided. Trams are often out of control, in addition to spontaneous combustion, there have been many trams out of control in recent years, and some domestic brands and foreign brands of trams have had such incidents. Compared with gasoline vehicles, electric vehicles use an electronic braking system instead of the traditional hydraulic braking system. Since the electronic braking system is relatively immature, there are also concerns that the problem of brake failure will be exacerbated. 
Trams typically have a higher power output and faster acceleration response, which means more stress and load during braking. Therefore, when the brakes fail, the consequences for electric vehicles can be even more serious. 
In addition to the faulty aspect of the train itself, the driver's driving habits may also cause loss of control. Compared with the fuel car, the operation method of the tram will be a little different, and it needs to adapt to the time, because it does not idle, it only goes when it steps on the accelerator, and it stops immediately when it releases the accelerator. In addition, the throttle of the tram is very sensitive, and it is more difficult to control than that of conventional fuel vehicles. The electric motor can reach the maximum torque in an instant, start quickly, and the acceleration time of three or four seconds is not uncommon. The problem is that it is more difficult to control the throttle to make the train accelerate linearly like a gasoline car, and sudden acceleration too much can also cause accidents. Written at the end: then in general, the safety of trams is indeed lower than that of oil cars, but with the current technological development, the technology of tram batteries has been gradually strengthened, and the tests have become more and more stringent, such as high temperature or acupuncture can make the battery safe, plus active safety systems such as AEB, can further ensure the safety of trams, and hope that in the future, cases such as spontaneous combustion runaway of trams can be effectively curbed.