Jia Xinguang: Should Pay High Attention to the Safety of Electric Vehicles

On May 12th, the US Traffic Police Administration conducted a collision, side collision, and rolling test on Chevrolet Volendam. Three weeks later, Vollanda caught fire in the parking lot. After inspection by the US Communications Administration, it was found that the lithium-ion battery pack was damaged during impact, and the rupture of coolant lines was the cause of the fire. Afterwards, the U.S. Administration of Transportation conducted another three collision tests. One of Wolanda caught fire again, the other produced heavy smoke and flares, but then extinguished itself. The U.S. Transport Authority stated that the risk of a fire in Wolanda or other electric vehicles is not higher than that of traditional gasoline-powered vehicles. However, companies that have already planned or plan to produce electric vehicles are still required to take measures to solve the safety problems related to lithium-ion batteries.

GM insisted that Veranda is safe and has a five-star collision rating from the Security Administration. It also stated: "Fire is caused in a specific environment. It will depend on whether the fire is happening accidentally or something that happens frequently." However, the general manager said that he may redesign the Volanda battery to solve the problem. Hidden danger.

According to Bloomberg News, when General Motors announced plans to build a Volenda plug-in hybrid vehicle in June 2008, managers called it "Moon to the Moon," designed to quickly exceed Toyota Motor Corporation. This is actually exactly the same as the overtaking of the corner road we are enjoying. The overtaking of the corner is very cool, but it is extremely risky. This incident once again sounded the alarm for us. We must play steadily in the development of electric vehicles and avoid quick success.

What is more frightening now is that many people in the industry, including auto makers, believe that traditional automobile accidents often occur. Electric vehicle accidents are inevitable and cannot be demanded. Others believe that the fire of electric vehicles is not a product quality issue. For example, the relevant department's conclusion on the spontaneous combustion of Hangzhou electric taxis concluded that: “Spontaneous combustion accidents cannot identify quality problems in the design and manufacture of battery cells. However, after the batteries are grouped, they cannot fully meet the needs of the vehicle use environment. In the case of battery leakage, insulation damage, and partial short circuit, it was not discovered in time. After repeated use, hidden dangers appeared, causing the accident.” Nevertheless, there is also recognition of the “batteries. After grouping, it can't fully meet the needs of the vehicle use environment. In fact, this is a security risk.

Lithium-ion battery potential for fire, burning or even explosion is still not completely eliminated. The earliest lithium-ion batteries used in mobile phones and notebooks have experienced lessons from fire explosions and large-scale recalls. In electric bicycles, models that use lithium-ion batteries also frequently catch fire. When flying in a civil aircraft, portable electronic devices that contain lithium or lithium-ion cells or batteries are required to be carried as hand luggage and are not allowed to be checked. This also shows that there are still some potential safety hazards for lithium-ion batteries.

When an electric vehicle collides, it may cause the positive and negative electrodes of the battery to break through the diaphragm. When the energy of the battery is quickly recharged to the battery, an instantaneous high current may cause the battery to short-circuit. The electrolyte is electrolyzed at a high temperature to generate gas. As the pressure rises, it causes fire and even explosion. Unlike gasoline vehicles, lithium-ion batteries may not catch fire at the time of the collision. However, due to internal injuries, the battery may catch fire afterwards, causing people to be caught off guard and causing serious consequences.

Bloomberg said that the investigation of Wolanda may scare off consumers and endanger the reputation of electric vehicles. Some people think: "This problem is really serious. The impact of the incident is not limited to Volenda. This may cause consumers to have a psychological shadow and wonder if they want to buy an electric car. Crises like this will undermine consumer demand for new technologies. confidence."