In recent years, the frequent occurrence of spontaneous combustion of new energy vehicles has brought safety issues to the spotlight again. Safety is the bottom line that must be maintained in the development of new energy vehicles in China. The spontaneous combustion of new energy is enough to sound the alarm for the entire industry. With the influx of a large number of car companies into new energy, safety issues have become the industry’s first cold water. This is something we must calmly think about. The button for spontaneous combustion of new energy vehicles The obvious increase has not only caused the safety of property and life, but also made potential consumers feel uneasy. Among new energy vehicles, plug-in hybrid vehicles have less spontaneous combustion, and pure electric vehicles have a higher proportion. Among them, the proportion of spontaneous combustion in the “charging process” is nearly half, followed by “on the road”, and the proportion of “stand-still spontaneous combustion” is the lowest.
Regardless of the form, this undoubtedly reveals the safety issues of new energy vehicles. According to statistics from relevant national departments, in 2018 alone, there were more than 40 cases of spontaneous combustion of new energy vehicles.
As one of China’s strategic emerging industries, new energy vehicles have developed rapidly in terms of industrial scale and technological level, and sales volume has become a rapid upward trend.
The number of new energy vehicles in our country has exceeded 1.6 million, accounting for nearly half of the total number of new energy vehicles in the world. With the rapid growth of the number, the safety issues of new energy vehicles have become increasingly prominent, especially the spontaneous combustion incidents that have attracted the attention of consumers.
Since it is an important issue related to the safety of life and personal property, how to solve the spontaneous combustion of new energy vehicles beforehand? Given that vehicle fire accidents may be related to factors such as electrical wiring, fuel cells, mechanical interference, and external fire sources, and Part of the evidence will disappear or change during the combustion process. Therefore, it is extremely difficult to investigate the cause of the incident. The analysis of the cause is extremely complicated. According to some historical recalls, the analysis of the cause of the defect of the vehicle is mostly motor failure, mechanical failure and line failure. . On the contrary, the cause of the failure caused by the lithium battery itself is relatively small.
To solve such problems, circuit design is the root cause. New energy vehicles need to rely on the cooperation between batteries, generators and motors. For PHEV and HEV models, they also need to combine engine working conditions, so the control unit ECU will play a very important role. However, for some second- and third-tier brands, the technology accumulation and research and development capabilities of electrification are relatively low, and their circuits have certain design problems. A complete battery pack includes a battery management unit, cooling system, and safety and explosion-proof devices. Therefore, the working logic of the circuit will directly affect the running state of the vehicle, and in serious cases, the system will be disordered and spontaneously combusted.
