Auto & Transportation

From “car roof rights protection” in Shanghai to post-accident burning in Guangzhou and other places, recent cases of brake failure and spontaneous combustion have brought new energy vehicles to the forefront. On the one hand, all kinds of capital have entered the new energy automobile industry, and on the other hand, frequent accidents have caused public concern. How to treat safety accidents in the process of rapid development? Where is the key to battery safety? Can new energy vehicles drive with peace of mind?

Why is the battery "easy to kill"? Wang Wei, chairman of Xinwangda Electronics Co., Ltd., believes that it is difficult to put out a fire after a large-capacity power battery, and the risk of re-ignition is high, which is a pain point for the development of new energy vehicles.

In the context of industry "mileage anxiety" and "endurance anxiety", long battery life has become the number one task for the industry to concentrate on tackling tough problems. Currently, there are two main technical routes to solve this problem, namely, ternary polymer lithium battery and lithium iron phosphate battery. Zhang Ming, general manager of Zhuhai Zhongli New Energy Technology Co., Ltd., said: "High nickel ternary materials have poor thermal stability. The higher the nickel content, the higher the battery energy density, but at the same time the higher the risk of battery thermal runaway." Widely used products, the main function of nickel in ternary polymer lithium batteries is to increase energy density, that is, unit power storage. In order to improve the cruising range, the proportion of nickel in battery cathode materials is getting higher and higher, and the ratio with cobalt and manganese is increased from 1:1:1 at the beginning to 5:2:3, then to 6:2:2, and finally To 8:1:1.

Standards such as the "Safety Requirements for Power Batteries for Electric Vehicles" issued in May last year require that after a battery cell is thermally out of control, the battery system will not catch fire or explode within 5 minutes, leaving time for escape. Li Yunfei, general manager of BYD's brand and public relations division, believes that 5 minutes is still not enough in the face of situations where the door may be damaged and difficult to open after the accident. If it can reach half an hour, it will be more safe.

At present, there are about 5 million new energy vehicles in the country, and it will increase rapidly in the future. The risks of power batteries and systems should not be underestimated.

The fundamental difference from traditional fuel vehicles is that the electronic control system of new energy vehicles is a key link in operation. If there is no professional system testing organization, and no automobile companies provide the corresponding driving data as support, only the hardware of new energy vehicles is tested, the result may be "no abnormality", and there may actually be hidden risks.

Industry insiders suggest that policy adaptation should be improved, and a new energy vehicle testing and evaluation standard system should be established. "Annual review" and routine maintenance should be included in power battery performance testing. "The "Implementation Regulations of the Road Traffic Safety Law of the People's Republic of China" require that vehicles must undergo annual inspections, but the current inspection indicators are all for traditional fuel vehicles." Zhang Ming said that there is no specific annual inspection for pure electric vehicles and other new energy vehicles. The standards for “audit” need to formulate the standards for passing the annual inspection and the entry threshold for the units that can implement the annual inspection.

"Pure electric new energy vehicles can only inspect the appearance, chassis, lights, brakes and other systems at the testing station. However, the key power battery packs and other components cannot be removed. This involves issues such as responsibility ownership and corporate technology confidentiality." Chapter Explained.

At present, intelligent networked cars are changing from vehicles to mobile smart terminals, energy storage units and digital spaces. There are hundreds of sensors in a car, which generate massive amounts of car data, user data, and road network data. How to store data, transmit data, and use data has become a major issue that must be faced by regulatory agencies, vehicle companies, and data companies.

"Data is becoming the core secret of intelligent connected vehicles. It is impossible for companies to provide all the data to the supervisory department. But if the supervisory department does not have the data, how to supervise it? How to support the detection capabilities of public inspection agencies?" Guangdong Guanghua Said Hu Yixiang, vice president of Technology Co., Ltd.