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Power button cell battery cr1620 breakthroughs cannot sacrifice safety

Statistics released recently by the Quality Development Bureau of the State Administration for Market Regulation show that as of October this year, more than 40 new energy vehicle fires have occurred in my country, including BYD Song, Lifan 650EV, Zotye Yun 100, etc., all of which have experienced spontaneous combustion accidents.

Tesla, which stands at the center of automotive public opinion, is not immune, and various spontaneous combustion incidents are reported from time to time. In addition to the recent frequent safety incidents, the driving range of electric vehicles will also be shortened in winter, which once again arouses consumers' anxiety about the safety and mileage of new energy vehicles.

Ouyang Minggao, an academician of the Chinese Academy of Sciences, previously stated that battery thermal runaway is the main cause of electric vehicle accidents. The main problems are insufficient testing and verification of battery products, deterioration of reliability during vehicle use, and low level of charging safety management technology.

Power batteries seem to be responsible for the frequent electric vehicle safety accidents that have come into people's sight. So, what are the deep-seated problems behind it? How to solve mileage anxiety and win more markets and consumers, and how to keep the safety barrier?

The concept of safety first and mileage second is beyond doubt

After an incomplete statistics of more than 80 electric vehicle fire accidents since 2011, Wang Fang, chief expert in the field of power batteries at the China Automotive Technology and Research Center, believes that the proportion of fire accidents during charging is relatively large, mainly due to mechanical damage such as body rupture and thermal runaway of the battery and water immersion.

"Safety is the cornerstone of the development of the new energy vehicle industry, and we must continue to pay attention to the safety of power batteries. We must not relax." At the meeting, Gao Junhua, deputy director of the Beijing Work Department of the China Automotive Technology and Research Center Co., Ltd., admitted that in the past two years, although the new high-energy-density batteries have increased the mileage of electric vehicles, they have also increased safety hazards. In fact, every step to improve the energy of power batteries should be based on safety first.

"Electric vehicles and power batteries are interdependent, mutually reinforcing, and mutually restrictive." Yang Yusheng, an academician of the Chinese Academy of Engineering, bluntly stated that the main contradiction of electric vehicles is safety and mileage. Among them, safety is the main aspect of the contradiction, and mileage is the secondary aspect, and the two cannot be reversed.

For a long time, the development of electric vehicles in my country has relied more on national policies and subsidies, and has emphasized more on mileage and energy density, resulting in many things being covered up or even ignored. After the subsidy is reduced, the real competition is the comprehensive performance of the product.

"The subsidy standards for new energy vehicles in the past two years are closely related to the energy density of power batteries and the vehicle's driving range." Gao Junhua said that the index requirements for the energy density of power battery products have made the product iteration cycle too short, causing some companies to blindly pursue energy density and ignore the optimization of the comprehensive performance of products. There are situations where local quality is outstanding and the overall chain is unstable, making it difficult to lay the foundation for sustainable development.

The risk of simply pursuing battery energy density is high

The power, economy, safety, reliability, and charging convenience of electric vehicles test the user experience. In Yang Yusheng's view, there are five major anxieties about long-range pure electric vehicles, which seem to be related to batteries, namely mileage anxiety, safety anxiety, charging anxiety, price anxiety, and battery anxiety.

"Only the real progress of batteries can promote the improvement of the level of electric vehicles. If you make rash advances, you will suffer. If the battery is immature, a battery in an unstable state will be used in a large number of cars, and problems will arise." Yang Yusheng emphasized that the danger of batteries restricts "the arbitrarily increase the mileage of electric vehicles."

"Everyone pursues energy density as a hard indicator. Because of this, there are many accidents. Simply pursuing energy density is a very risky thing, which will inevitably sacrifice the safety and service life of power batteries." Deng Zhongyi believes that improving the energy density of power batteries is meaningful only under the premise of ensuring safety and acceptable cost and life.

Solving safety problems requires starting from the system level

At present, China's new energy vehicle industry is shifting from policy-driven to market-driven, and the market competition in the power battery industry is becoming increasingly fierce. Wu Feng, an academician of the Chinese Academy of Engineering and a professor at Beijing Institute of Technology, said that although my country's power battery industry has made remarkable achievements in recent years, it still faces many technical bottlenecks that need to be broken through, such as how to improve safety and driving range, how to achieve long life and low cost, and battery recycling. In addition, it is also facing the reality of overcapacity of overall batteries, insufficient high-quality production capacity, tension in related enterprises, and a new round of reshuffles is accelerating.

"The safety of electric vehicles involves different levels, from materials to cells to battery systems, power subsystems, and electric vehicles. What is presented to consumers is the safety of electric vehicles." Long Huijin, chairman and president of Tafel New Energy Technology Group, said that some people now say that the materials are unsafe, and some say that the cells are unsafe. We need to solve the safety problem of the entire electric vehicle from a system level. When solving safety problems, we must consider the worst case scenario of other links. Only in this way can the cells and materials be the safest.

This coincides with Wang Fang's point of view. Wang Fang said that the safety of electric vehicles is a systematic project. From materials to batteries, each part must have a basic safety requirement. Only by working together as a joint system can we make a better and relatively safe battery system for the whole vehicle, rather than concentrating the safety pressure of a certain part on a certain link.

To this end, Qin Xingcai, secretary of the Party Committee and chairman of Tianjin Lishen Battery Co., Ltd., put forward two suggestions: First, formulate national quality standards for power batteries. Power battery companies should establish scientific and complete quality agreements with vehicle manufacturers. This will not only promote the healthy development of the industry, but also reduce the pressure of after-sales service. Second, battery manufacturers and vehicle manufacturers should work together to strengthen the safety research and management of power batteries throughout their life cycle. The initial safety of the battery does not mean safety throughout its entire life cycle, and standards for new energy vehicle testing should be issued as soon as possible.

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