The news of spontaneous combustion of new energy vehicles affects the hearts of many consumers. Recently, several spontaneous combustion incidents of new energy vehicles have occurred one after another, which makes consumers wonder: Why are new energy vehicles so "sensitive"?
On August 21, a pure electric vehicle in Sanming, Fujian Province, smoked while charging. When firefighters arrived to extinguish the vehicle with water guns, the vehicle suddenly exploded. BAIC new energy said that after preliminary investigation, the traces of residue found in the vehicle, and according to the video and the unburned condition of the accident vehicle, it is currently judged that the deflagration accident was related to the flammable liquid containing alcohol in the vehicle.
Recently, a pure electric vehicle appeared in Haikou, Hainan Province. According to local media reports, the driver said that when driving to the intersection of yebo road and yeheyi street, the chassis of the vehicle made an abnormal sound of "bang". When the instrument panel showed the fault of the vehicle, the vehicle began to smoke and soon caught fire. The car was purchased three months ago, driving 20000 km.
The Spontaneous Combustion Accident of new energy vehicles involves parking, charging and driving. Sun Fengchun, an academician of the Chinese Academy of engineering and professor of Beijing University of technology, once told reporters that most of the spontaneous combustion accidents of new energy vehicles occur in the state of high residual power, in which 57% of the accidents with more than 85% of the battery power are left, 14% of the remaining power is 100%, and 50% of the charging state and the non charging state respectively.
In the community where the reporter lives, a new energy vehicle talks about safety issues and always feels "not down-to-earth". In the near future, he always reminds the owner of a new energy car if he has a fixed parking space. "What can we do as consumers? In addition to normal use, normal open, I also bought spontaneous combustion insurance, can only hope that there will be no problem
Another pure electric new energy vehicle owner works in the electronics industry. He mentioned that when purchasing new energy vehicles, the potential safety problems of batteries were indeed taken into consideration. After combining with his understanding of electronic products, he decided to choose a vehicle with reasonable range rather than "exorbitant" range. He hoped that safety risks could be avoided in terms of power battery types and capacity.
Even though he has heard that the charging power of the super large 7-kw engine room in winter will not affect the safety of a car's engine room, even if the charging power is too fast for a large number of car owners, he will not be able to charge the battery in the cabin very fast I always open the hood and let it cool while charging. "
According to the electric vehicle safety report released by the electric vehicle 100 people's Congress in 2020, the annual combustion accident rate of China's automobiles will reach 3.16%, and that of new energy vehicles will be 0.98%. Among them, charging process and static state after full charge are the main components of fire accident. According to the report on power battery safety in 2019 issued by battery safety laboratory of Tsinghua University, 58% of the cases in 2019 are caused by electric vehicle static and charging fire accidents, which are much higher than 26% in driving.
Lin Cheng, deputy director of the National Engineering Laboratory of electric vehicles of Beijing Institute of technology, told reporters that at present, new energy vehicles generally have high driving range, and the high-energy battery materials carried by them have high energy, but they are also dangerous. From a technical point of view, if spontaneous combustion occurs, the first possibility is that the battery itself has quality problems. For example, the consistency of battery, the input of production equipment and the stability of materials used will affect the quality of battery. If there is a defect in the production process, it will eventually trigger a short circuit and cause combustion and explosion. In addition, from the hardware point of view, if the vehicle protection is not in place, the battery damage problems will also lead to fire; from the system perspective, the early warning, monitoring and management of the battery are not in place, and there is no systematic solution, etc., which will lead to the electric vehicle fire.
The reporter noted that in the investigation results of manufacturers after the new energy vehicle spontaneous combustion accident, the causes were often attributed to "external force damage to the battery", ignition by foreign matters in the engine room or vehicle, or "unknown reason", external fire source, etc. However, automobile manufacturers often emphasize the publicity of "safe wading in water", anti-collision and anti puncture, intelligent temperature control and other publicity in the description of the safety of the three electric systems of new energy vehicles, but often lack of safety guidance in use, such as how to avoid battery damage, how to cut off the power of the whole vehicle after a fire, and how to escape.
Lin Cheng also stressed that in fact, the proportion of spontaneous combustion of electric vehicles is lower than that of fuel vehicles, and the proportion of spontaneous combustion must decrease. In addition, with the development of electric vehicles and the progress of technology, its safety has been improving.
On May 12, 2020, three mandatory national standards, safety requirements for electric vehicles, safety requirements for electric buses and safety requirements for power batteries for electric vehicles, formulated by the Ministry of industry and information technology, have been issued and will be formally implemented on January 1, next year. The safety of new energy vehicles will be continuously improved and improved in the future development.
(source: People's Daily - Auto Channel)