Application performance of the hottest power batte

2022-09-19
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Application performance of power batteries in new energy vehicles

in 2016, driven by the strong support of national policies and the accelerated promotion and application of new energy vehicles, the demand for vehicle power batteries in China increased significantly. Domestic power battery enterprises represented by BYD, AVIC lithium, GuoXuan high tech, Lishen, catl and other enterprises have significantly improved their production capacity and product quality through investment, expansion and independent innovation, but their comprehensive competitiveness still needs to be enhanced. As more and more international power battery enterprises begin to invest and build factories in China, local power battery enterprises will face greater competitive pressure. Therefore, domestic vehicle power battery enterprises should make more efforts in technology research and development and industrialization progress

introduction to common power batteries

at present, there are four main technical routes in terms of vehicle power sources: lithium ion battery, hydrogen fuel cell, supercapacitor and aluminum air battery. Lithium ion batteries, supercapacitors and hydrogen fuel cells are widely used, while aluminum air batteries are still in the stage of laboratory research. In terms of energy supply, lithium-ion batteries and supercapacitors are suitable for pure electric vehicles, but they need external charging, while hydrogen fuel cell vehicles need external hydrogen filling, and aluminum air batteries need to be supplemented with aluminum plates and electrolyte. At present, lithium-ion batteries will occupy the main development space for a long time in the future

lithium batteries also have their own ways

as for power batteries, at present, ternary lithium batteries, lithium iron phosphate batteries and lithium titanate batteries are all used in the field of electric vehicles

due to the high capacity density and relatively long endurance mileage of ternary lithium batteries, passenger cars of domestic car enterprises have turned to ternary lithium batteries, including BAIC, BYD, JAC, etc. However, ternary lithium battery has shortcomings such as poor safety, poor high temperature resistance, poor service life and so on. At the beginning of 2016, it was also suspended by the Ministry of industry and information technology, and ternary lithium battery passenger cars were suspended from being listed in the list of recommended models for the promotion and application of new energy vehicles

compared with ternary batteries, lithium iron phosphate batteries are increasingly active in the electric bus market because of their stable safety performance, good high temperature performance, light weight and other advantages. However, due to its poor low-temperature performance, low compaction density of cathode material and other defects, it does not have advantages in micro batteries

there is another kind of battery. Due to Gree dongmingzhu's appreciation and support for Zhuhai Yinlong, lithium titanate battery has entered the public view

lithium titanate battery is also the battery with the longest service life and the highest safety among lithium batteries. In terms of life cycle, ordinary lithium-ion batteries have about 1000-2000 cycles, while lithium titanate has 30000 cycles, which is 15 times that of the former. However, the battery made of this material has a natural defect of low energy density. In the past few years, the national policy support has been linked to the mileage, and the battery with high energy density is more favored by the policy. According to the latest subsidy policy countersignature draft, there are independent regulations for fast charging batteries. Therefore, industry experts speculate that lithium titanate batteries will usher in the spring of development in the future. Zhuhai Yinlong has mastered the world's top lithium titanate core technology, overcome the "five problems" recognized in the industry, and achieved excellent characteristics such as 6-minute fast charging, wide temperature resistance, 30-year cycle service life, no fire and no explosion. And Yinlong is currently studying the combination of lithium titanate battery and fuel cell to solve the problem of new energy vehicle mileage

development status of foreign power battery industry

at present, Japan is in the leading position in the field of lithium-ion batteries. It has formulated a development plan to 2030 and systematically arranged research and development projects to maintain a long-term leading position. Panasonic, NEC, Sony and other famous companies have built large-scale lithium-ion battery production lines. The lithium batteries supplied by LG Chemical in South Korea have driven more than 300000 electric vehicles on the road, and Samsung SDI has also become a major power battery supplier in the world, providing batteries to BMW, Fiat, Ferrari, etc

a few years ago, the Obama administration dedicated $2billion to supporting the development of the automotive lithium-ion battery industry in the United States through the economic stimulus plan. Tesla Motors and Panasonic are jointly building a $2billion super lithium-ion battery factory in Nevada

the United States has developed a research and development route for power batteries, including new architecture power batteries with metal lithium, silicon alloy and other materials as negative electrodes, high-voltage materials, air, sulfur as positive electrodes, and non lithium system power batteries

with the rapid development of China's new energy vehicle industry, more and more foreign power battery enterprises have invested and built factories in China. Samsung SDI and LG Chemical have established joint-venture plants in Xi'an and Nanjing, China respectively, and Panasonic Dalian plant is under construction. Bosch and SK are also planning to build power battery plants in China

development status of domestic power battery industry

China's lithium-ion battery research project has always been the key project of "863". After more than 20 years of continuous support, most materials have been localized, and the transition from catch-up period to synchronous development period has begun. The total local production capacity ranks first in the world, supporting the demonstration and promotion of new energy vehicles in China

(1) the positive pole is made of lithium iron phosphate and the negative pole is made of graphite. The developed 50ah energy battery has an energy density of 136.6wh/kg and a power density of 1101w/kg; The developed 20Ah energy power dual-purpose battery has an energy density of 106.5h/kg and a power density of 1119w/kg

(2) the positive pole adopts spinel lithium manganate, nickel cobalt manganese ternary mixed material, and the negative pole adopts artificial graphite material. The developed 25ah flexible packaging energy battery has an energy density of 162wh/kg; The developed 35ah energy power dual-purpose battery has an energy density of 135wh/kg

(3) the positive electrode adopts nickel cobalt manganese ternary material, and the negative electrode adopts natural graphite/artificial graphite/mesophase carbon microspheres and other materials. The developed 10, 15, 20, 28, 30, 45ah power battery has an energy density of 180wh/kg; The developed 2.6ah18650 cylindrical battery has an energy density of 200wh/kg

great progress and breakthroughs have been made in system integration technology and capabilities. The energy density of the power battery system using lithium iron phosphate material reaches 90wh/kg, and the energy density of the power battery system using ternary material (18650 cylindrical power battery) reaches 110W, including 256 batches of waste plastic h/kg

in terms of forward-looking technology research, the pilot plan of the Chinese Academy of Sciences supports relevant research institutes to develop lithium-ion battery samples with an energy density of more than 300wh/kg and lithium sulfur battery samples with an energy density of more than 500wh/kg, but the cycle life, safety and other performance indicators need to be further improved

at present, China has formed a perfect lithium-ion power battery industry chain system, including key raw materials (positive pole, negative pole, diaphragm, electrolyte, etc.), power battery, system integration, demonstration application, recycling, production equipment, basic research and development, etc. we have mastered the formula design, structural design and manufacturing technology of power battery, and should often check and confirm that it conforms to the regulations, The production line is gradually transitioning from semi-automatic pilot plant to full-automatic large-scale manufacturing technology

in terms of industrial layout, China has formed four major power battery industrialization clusters, mainly in the Pearl River Delta, the Yangtze River Delta, the Central Plains and Beijing Tianjin Hebei region. According to statistics, at present, nearly 100 power battery enterprises have carried out the R & D and industrialization of power batteries, with nearly 100billion yuan of industrial capital investment, forming an annual production capacity of nearly 40gwh. Significant progress has been made in technology R & D and industrialization, which has effectively supported the rapid development of the new energy vehicle industry

2020 is the stage of technological upgrading. The industrialization of new lithium-ion batteries has been realized, with the specific energy of energy type lithium-ion batteries reaching 350wh/kg, and the specific energy of energy power type power batteries reaching 200wh/kg. The intelligent manufacturing of power batteries has been realized, the product performance and quality have been greatly improved, and the cost has been significantly reduced. The economy of pure electric vehicles is basically equivalent to that of traditional gasoline vehicles, and plug-in hybrid vehicles have entered the stage of popularization and application

2025, industrial development stage. Remarkable progress has been made in new power battery technology. The development of power battery industry is in line with the international advanced level, forming 2-3 large power battery companies with strong international competitiveness, with an international market share of 30%. Look at the problem. New system battery technologies such as solid-state battery, lithium sulfur battery and metal air battery continue to make breakthroughs, and the specific energy reaches more than 400wh/kg

2030 is the mature stage of industry. The battery of the new system is practical, and the specific energy of the battery unit is up to the following points should be paid attention to when maintaining it: to more than 500wh/kg, the cost will be further reduced; Power battery technology and industrial development are at the international leading level

for a considerable period of time in the future, China's energy-saving and new energy vehicles will take the popularization and application of plug-in hybrid vehicles, pure electric enterprises and other new energy vehicles as the main task, and we are eager to reduce the cost and improve the performance of power batteries. Developing new lithium-ion batteries and new system batteries, improving the intelligent manufacturing level of power batteries, and improving the verification and testing methods and standard system are not only the development needs of China's energy-saving and new energy vehicles, but also the key tasks of China's power battery development, which is urgent

conclusion

the core of the competition of new energy vehicles is technology, and the most urgent thing is to achieve a breakthrough in power battery technology. At present, new energy vehicles, including hybrid electric vehicles, fuel cells and pure electric vehicles, are more feasible technical options for new energy vehicles. Among the key components of electric vehicles, power batteries have the highest technical threshold and the most concentrated profits. If we can't master the core technology of power battery, China's new energy vehicles are doomed to struggle. The breakthrough of battery technology will become the best entry point for China to enter the field of new energy vehicles and seize the commanding height of the industry in the future

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