New energy drives traditional transformation

"Power batteries are the core components of new energy vehicles and the key support for the power transformation of new energy vehicles." Recently, at the theme summit of "Advanced Power Battery Technology Innovation" of the 2020 World New Energy Vehicle Conference, Xiao, a researcher at the 18th Research Institute of China Electronics Technology Corporation, said.

He emphasized that new energy vehicles need power batteries with high energy density, high power density and high safety, and the innovation of advanced power battery technology is very important for the development of new energy vehicles.

Xiao Chengwei said, "In the future, blade battery technology, CTP(Cell To Pack) and large module technology, cobalt-free battery technology and lithium-ion battery dry process technology are several current technological innovation hotspots." At this splendid theme summit, experts from academia and industry shared these technological innovations in detail and in depth, presenting an ideological feast on new technologies of power batteries for online and offline audiences.

In 20 19, the sales of new energy vehicles in major countries in the world exceeded 265,438+million, and the sales in China reached12.06 million, accounting for 4.68% of the sales of new cars in China. By the end of 20 19, the global cumulative sales of new energy vehicles exceeded 7.2 million, with China accounting for more than 50%.

The market target of new energy vehicles in China is: the sales volume will reach 5 million vehicles in 2020, 30 million vehicles in 2025, 75 million vehicles in 2030 and12000-1400,000 vehicles in 2035.

The vigorous market development of new energy vehicles also puts forward higher requirements for power batteries. How to achieve high energy density, high power density and high security is the direction that academic and industrial circles strive to explore.

"With the support of the state, the energy density index of power batteries has increased year by year. High-specific power batteries are the key direction of state-supported research, and technology and industrialization are progressing rapidly, and the system of industrialized batteries has been realized. " Novel:

Talking about the progress and trend of power battery technology, he introduced that the changing trend of China lithium-ion power battery technology route is to pay equal attention to hybrid and pure electric vehicles, focusing on pure electric vehicles and taking into account the field of hybrid vehicles. High specific energy 300Wh/kg lithium-ion battery has become a hot spot in industrialization.

"In the future, we need to pay attention to the balance between energy density, power density, safety, cycle durability and cost, intelligent manufacturing and digital factory design, the level of design, development and industrialization of power battery systems, standardization (monomer, module and system) and full life cycle test and verification (especially safety and reliability), and the research and development of new materials and new system battery forward-looking technologies (solid-state batteries, lithium sulfur batteries, lithium-air batteries and lithium-ion batteries, etc.). ). Novel:

Zhang Jiujun, a professor at Shanghai University, said that lithium-ion batteries are widely used at present, including three types: automotive lithium-ion batteries, lithium-sulfur batteries and lithium-air batteries. "As far as the application of lithium-ion batteries in the automotive field is concerned, at present we emphasize that the cruising range should reach 400 kilometers and reach 700 kilometers by 2030. In the future, it is necessary to further improve energy density, power density and life span to improve safety. " Zhang Jiujun said.

Huang, a researcher at the Institute of Physics, Chinese Academy of Sciences, shared the technical research on cobalt-free cathode materials for power batteries. He introduced that the first generation of cobalt-free materials is lithium manganate, and the second generation of cobalt-free materials is lithium iron carbonate. At present, it is mainly lithium nickel cobalt ternary battery. With the development of material technology, people are constantly trying to reduce the content of cobalt. At present, cobalt energy accounts for 10%, which may be reduced to 5% and then to 3% in the future.

Dong Quanfeng, distinguished professor of Xiamen University, believes that the future social energy support system needs the combination of renewable energy and high-efficiency electrochemical energy storage. The development goal of advanced power battery is to build a new electrochemical energy storage system with high specific energy and high specific power.

"There are generally two ways of electrochemical energy storage, one is a typical redox reaction (traditional battery), and the other is the process of charge storage and release at the interface (supercapacitor). Our team put forward a new model. Through the surface regulation of materials, the electrochemical adsorption of high surface area and a large number of ions on the surface can be realized at the same time, filling the gaps in the first two categories. " Dong Quanfeng said.

Liang Chengdu, co-president of Contemporary Ampere Technology Co., Ltd. New Energy Technology Co., Ltd. believes that the efficient group technology of power battery system represented by CTP is the future innovation trend. It has many advantages: the number of parts is reduced by 40%, the energy density is increased by 10%- 15%, the service life is prolonged by 10%, the cost is reduced by 10%, and the product system is reliable and safe.

Lu Zhipei, deputy director of the Deep Development Center of BYD Co., Ltd., introduced BYD's technological innovation in high-integration blade power batteries. He mentioned that the blade battery can reduce the number of components by 40%, increase VCTP by 50% and reduce the cost of the whole battery system by 30%. "We have invested a lot of research and development in blade batteries, hoping to achieve higher integration efficiency and higher energy density, making blade batteries more competitive. In 2025, it is estimated that the integration efficiency will reach 73% and the volume energy density will reach 300Wh/kg. " He said.