We can't ignore the importance of car battery safety

Lithium-ion batteries are the biggest safety hazards of electric vehicles. Improving the safety level of batteries is the core of improving the safety of electric vehicles.

From Tesilachenggong "fire extinguishing" can be seen, China's electric vehicle industry and the international advanced level, there is still a large gap.

First, there is a lack of correct public opinion guidance and response measures to the crisis.

In the Internet age, transparent facts and rational explanations are far more effective and persuasive than organizing protracted expert groups and so-called seminars. Despite the fact that the U.S. government "closed the door", the officials of Musk and Tesla handled it correctly within three days, allowing the public to conclude that electric cars seemed safer. In May, after the BYD E6 fire on Shenzhen Street, the focus of public opinion was not on the "evil" of the 180-km/h crash, but on the safety of electric vehicles. More than three months later, a 13-member quality appraisal team formed a conclusion that the fire E6 had "no defects in the safety design of the vehicle." At this time, many people had already emotionally moved away from pure electric taxis and agreed with electric vehicles. The unsafe point of view.

The second is to ignore the safety design of electric vehicles resulting in increased safety hazards.

Compared with the Tesla fire and the BYD accident last year, the speed and slowness of the fire, the partial or complete vehicle, and the casualties are important factors in the public's evaluation of the safety of the car. If BYD's car was able to improve its design in terms of cab protection, flame retardant battery system, battery protection, and location, and better consider the safety of personnel in the car, perhaps BYD's responsible person would not be helpless. Say "We have bad luck. (The vehicle involved) hit the E6 ... at a speed of more than 180 kilometers per hour. "

Third, the safety of batteries is not fully recognized as the key to the development of electric vehicles.

Improving the safety level of the battery itself is the core of improving the safety of electric vehicles. Lithium batteries with high energy density contain fire risks. The biggest safety hazard for electric vehicles is lithium batteries. It can even be said that battery fires are a hurdle that must be overcome in the process of the electric vehicle market. The 1,8650 lithium battery used by Tesla Motors is currently one of the most mature, cost-effective, and safest power products. At the same time, Tesla has adopted products produced by leading international companies and has also ensured the safety and consistency of its battery system as much as possible. From the point of view of the Tesla car fire, external forces were the main cause of the lithium battery accident, while other batteries did not catch fire, indicating that the safety protection design of the entire battery system was reliable. Our country power lithium-cell manufacturing enterprises have not been able to grasp the characteristics of the intrinsic factors of the safety of lithium-ion cells, and have not been able to solve the internal safety problems of power cells and the overall protection problems of batteries from the manufacturing process.

Safe and reliable electric vehicles cannot be separated from high-quality lithium battery products. Although domestic lithium battery concept stocks borrow Tesla hot fry, Japan's Matsushita Corporation is still the main supplier of Tesla's lithium battery. By the end of June, Matsushita had shipped 100 million batteries to Tesla. Although lithium-ion batteries in China and Japan, but obviously "big and not strong", high-end products market, especially power batteries, is still dominated by foreign companies. According to the survey, China's lithium-ion battery industry ranked in the top 5 companies in 2012, in addition to Tianjin Lishen, the other are Japanese and Korean sole proprietorship or holding enterprises. In contrast, there are gaps in the production of lithium electric raw materials, lithium cell manufacturing, battery pack assembly, etc.. Many enterprises still produce lithium batteries by hand or semi-automation, making it difficult to ensure the safety, stability, and consistency of products. The survey shows that in 2011 and 2012, the proportion of lithium battery loss-making companies in China reached 24.5 % and 22.7 %, respectively. The phenomenon of declining profits and losses is common, and many companies are difficult to carry out necessary R&D investment to ensure battery consistency and safety.

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