How to ensure the battery safety of electric vehicles first

Electric vehicles have caught fire frequently, raising public concerns about the safety of electric vehicles, and companies have responded to the incidents.Apart from byd's statement that the power battery in the chassis position of the vehicle was intact, tesla said the spontaneous combustion was caused by a failure of a single battery module located in the front of the vehicle.After investigation, weilai found that the vehicle spontaneous combustion accident in Shanghai was also caused by the hidden danger of battery safety.

Due to potential battery safety problems in some models, weilai has announced the recall of 4,803 ES8 vehicles equipped with nev-p50 module battery packs manufactured on April 2, 2018 solstice on October 19, 2018, and the replacement of battery packs for users.According to ning DE times (73.880, 1.46, 2.02%), the battery module supplier of nextev, the recalled battery case body and the module structure provided by nextev may cause interference, which may lead to short-circuit risk of low-voltage sampling harness under some extreme conditions, posing a safety risk.

In recent years, electric vehicle battery fire at home and abroad news often appear.Similar incidents have occurred in the United States, Mexico, France and the Netherlands.According to information available, more than 40 new energy vehicles caught fire from January to October 2018, the state administration of market supervision said.

Why do electric car fires often involve batteries?Hui to the relevant person in charge of science and technology Xu Rongzhen said that the batteries of electric cars in short circuit, piercing, overcharge, impact, and so on and so forth, inside the battery electrolyte will rapidly accumulating heat, when the battery inside the core temperature of 110 ℃, the starting point to thermal runaway, the next is likely to be a series of chain reaction, cause heat and temperature continues to accumulate, holds the probability of safety accidents such as fire.

Zhao xinghua, managing partner of zhencheng investment, said that most electric vehicles are now equipped with lithium batteries, and lithium battery technology itself is relatively safe and reliable.However, in the design of some vehicle models, in order to save the space occupied by battery packs and improve the vehicle's endurance, there are some safety risks in the arrangement of battery packs, which may easily cause the phenomenon of battery spontaneous combustion.

It is understood that due to limited charging facilities and other reasons, consumers generally have certain requirements on the range of electric vehicles, making car companies sacrifice some stability in pursuit of high energy density of batteries.That is changing, however, as demand for range becomes more rational as charging infrastructure improves.

According to past statistics, the spontaneous combustion rate of electric vehicles is not higher than that of traditional fuel vehicles. With the development of technology, consumers should have confidence in the safety of electric vehicles' batteries.In recent years, the production and sales of new energy vehicles continue to go up, which proves that their market recognition is constantly improving.It is an urgent task to eliminate consumers' safety concerns about electric vehicles, especially the battery problem, which is the main cause of many vehicle fires.

The power battery industry entered the "reshuffle" period after the favorable policy subsidies in the early stage. The product quality was not up to standard, and the enterprises that could hardly make profits were gradually eliminated. The industrial development changed from "large-scale" to "fine quality".The country already has corresponding means of electric vehicle safety warning and supervision, and hopes to continue to strengthen the construction of emergency response system for new-energy vehicles and power batteries.

The industry itself is also making continuous progress. More and more traditional automobile manufacturers are joining the "battlefield" of electric vehicles. The control ability of product quality accumulated by these enterprises over the years is also promoting the improvement of the safety of electric vehicles.The new "player" is also growing. Huang chendong, vice President of wei power engineering, said that the company has set up an interdepartmental action group to cooperate with relevant supply chain partners to continuously optimize the product quality management system.