502030 battery

　　How to control the balance between safety and long life of 502030 battery?

　　According to data from the State Administration for Market Regulation, at least 40 fire accidents involving new energy vehicles occurred in China in 2018. Since April this year, electric vehicle fire and smoke accidents have occurred one after another. Power battery safety is a sensitive topic, and It is a topic that cannot be avoided.

　　Recently, Wang Zidong, deputy secretary-general of the China Power Battery Innovation Alliance and deputy secretary-general of the China Electric Vehicle Charging Infrastructure Charging Alliance, conducted a multi-dimensional analysis of electric vehicle safety issues at the first China International Electric Vehicle Safety Technology Innovation Conference. He believes that before there is an obvious technological breakthrough in power battery materials, it will be difficult to make further breakthroughs after the specific energy develops to a certain level. At the same time, the negative impact on security is growing. Before mastering the fire rules of lithium batteries, controlling the balance between energy density, safety and long life is an issue that cannot be ignored.

　　Among the many technical routes for lithium batteries, the duel between lithium iron phosphate and ternary is the most stalemate.

　　Lithium iron phosphate has high safety and long life, but its energy density is not as high as that of ternary, but this can be compensated by increasing the battery capacity. Its low-temperature performance is poor, mainly because of its low low-temperature performance and poor material consistency in small-capacity batteries.

　　Ternary batteries have high energy density, good consistency, and good low-temperature performance, but are slightly less safe and have far less cycle life than lithium iron phosphate batteries.

　　Currently, China's lithium iron phosphate battery has the most mature industrial chain, and we have mastered many core technologies in related fields, while ternary batteries, represented by Japan and South Korea, are relatively more mature. Wang Zidong believes that this kind of technical duel is more like China vs. Japan and South Korea.

　　If evaluated solely from the performance of the power battery itself, he listed 10 dimensions: 1. Safety of the battery pack, 2. Energy density of the battery pack (not a single cell), 3. Cycle life of the battery pack, 4. The cost of the battery pack, 5. Charging rate, 6. Battery cell consistency, 7. Low temperature performance, 8. Group utilization, 9. Convenience of recycling and reuse, 10. The positive and negative electrode materials can be recycled, repaired and reused. .

　　Where is the ceiling of 502030 battery?

　　In Wang Zidong’s view, it is necessary to have a clear understanding of improving the energy density of 502030 battery: to improve the performance of 502030 battery for electric vehicles that can be industrialized, it is not only necessary to significantly improve the performance of positive and negative electrode materials, but also needs to be improved in many aspects. Only with relatively large breakthroughs can it be possible to achieve real improvements in 502030 battery.

　　So from the definition of industrialized 502030 battery, the goal proposed by the country is: by 2020, electric vehicles can run 400km on a single charge, and the specific energy of a single battery reaches: 300Wh/kg (350), 600Wh/L (700), 0.6 yuan/Wh, the battery system reaches: 220Wh/kg (260), 300Wh/L (380), 1.0 yuan/Wh, cycle life 1500 times (80% DOD). Why do people think of flexible packaging batteries when they mention high energy density? From the perspective of vehicle engineering, we look at the energy density of the power battery system, not the energy density of the single battery. From single cells to modules to system integration, there are many intermediate links, such as connectors between batteries, connecting cables between modules, boxes, fixing racks, support frames, thermal conductive structures, etc., which will add a lot of weight. , Wang Zidong proposed that optimization should be done in terms of system energy density, reliability and safety.

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