As the core part of new energy vehicles, power batteries play a vital role in the development of the new energy vehicle industry. Therefore, it is also the most discussed and most concerned area in the industry. At the 7th Global New Energy Vehicle Conference held on December 17, Li Shijiang, Chairman of the Multi-Fluoride Group, Guo Yongsheng, R&D Manager of Ningde Times, Rao Yumin, Deputy General Manager of Watmar, and Feng Xiao, General Manager of Xingheng Power Co., Ltd. Hong Bin, Deputy Director of the Oriental Nissan Qichen Division, Mr. Liao Zhenbo, Vice President of BAK Battery, and Deng Lunhao, Vice President of Zhuoneng Power Battery, 7 guests focused on the current industry's most concerned power battery technology upgrade, product price, policy requirements, etc. The parties made statements and discussed. The following is a highlight of the 7 guests.
Guo Yongsheng: Solid-state lithium metal battery is the next generation of power battery technology
Guo Yongsheng introduced that solid-state lithium metal batteries can be used for lithium metal, and high-pressure materials can be used. At the same time, there is certain guarantee in the safety of power batteries. This is a research and development layout of the future development of battery technology in the Ningde era. Solid-state batteries can be divided into three generations. The first generation is equivalent to a traditional lithium-ion battery to form an electrolyte. This advantage is not obvious, because after switching to a solid-state battery, the energy density and volumetric energy density are higher than the existing conventional lithium ions. low. The second generation is to replace the negative electrode with lithium metal, the positive electrode with a traditional positive electrode material, and a high-pressure material. In the next generation, since the negative electrode uses lithium, the positive electrode material can be made of a material that does not contain lithium, sulfur can be used, and other lithium-free materials can be tried, so that the energy density has room for further improvement. At present, the solid state battery of sulfide is a relatively advanced technology. There are some advantages in using sulfide. The temperature conductivity is relatively high, the electrolysis window is relatively high, and the compatibility with lithium metal is better, but the challenge of sulfide is facing. It is also very large.
Ningde Times R&D Manager Guo Yongsheng
Rao Minmin: Improving the low temperature performance of lithium iron phosphate battery from four blocks of positive electrode, negative electrode, electro-hydraulic and binder
Rao Yumin introduced that Wattmar conducted a detailed study on the factors affecting the low temperature performance of lithium iron phosphate batteries. First, the influence of the positive electrode, the positive electrode of lithium iron phosphate itself is relatively poor in electronic conductivity, in addition it is more prone to polarization, reducing capacity play; second, the negative electrode, the negative electrode is mainly low temperature charging this piece because it It will affect the safety problem; the third is electro-hydraulic, which may increase the viscosity at low temperature, and the migration resistance of lithium ions will increase; the fourth is the binder, which has a relatively large effect on the low-temperature performance of the battery. of.
Wattle Deputy General Manager Rao Yumin
Therefore, Waterma's overall idea of ​​raising the low temperature of lithium iron phosphate is to improve the low temperature performance of lithium iron phosphate battery from the positive electrode, the negative electrode, the electro-hydraulic and the binder. After the improvement of the whole system, Waterma has done a good job in the lithium iron phosphate battery cell. In terms of charge and discharge characteristics, the charging constant current ratio of -20, -30, -40 degrees and 0.5C can be achieved. 62.9%, discharge -20 degrees can release 94%.
Li Shijiang: Exploring the core technology of new energy vehicles by studying the three elements of fluorine, lithium and silicon
Polyfluoride has focused on lithium and silicon from the study of fluorine. Among the thousands of substances, the familiar periodic table of the elements is in this place. Polyfluoride studies three main elements of more than 100 elements. Fluorine, lithium, silicon, fluorine in the upper right corner, is the most active non-metal active, humans have found it pays a huge price, the upper left corner has a high-energy metal element called high-energy metal lithium, which consists of two elements The lithium battery has the largest electrolysis position; another silicon element is also the object of research. By studying three elements, three batteries are manufactured, and then the three technologies of new energy vehicles are explored, namely, lightweight structure, power electrification, and intelligent vehicle, which are three vertical technologies. In addition, there are three horizontal technologies, battery, motor and electronic control, and the core technology of multi-fluorinated new energy vehicles is formed by three horizontal and three vertical technologies.
Li Shijiang, Chairman of the Multi-Fluor Group
Feng Xiao: Lithium Manganate Battery is the best choice in the field of electric logistics vehicles
At present, in the mainstream automobile factories around the world, in addition to CATL being selected as a partner by BMW, China's electric market has not gone international. Today, the market for electric vehicles in China is entirely supported by policies and subsidies. Feng Xiao said that first of all, let's not talk about the global competition pattern, first stabilize the heel, take root in the domestic electric logistics vehicle market, and improve the power battery level based on the cost performance. This star problem should be solved in the short and medium term.
Feng Xiao, general manager of Xingheng Power Co., Ltd
The power battery should start from the needs of the end user and improve the cost performance. Each of the three types of batteries has its own merits. The iron-lithium battery is the safest, the energy density of the ternary lithium battery is high, and the cost of lithium manganate is the lowest. Feng Xiao believes that lithium manganese oxide battery is the best choice in the field of electric logistics vehicles, because its economy is the best, and secondly, it can achieve 2000 cycle life, and the safety is moderate again.
Hong Bin: The cruising range is not necessarily proportional to market acceptance.
When developing electric vehicles, they often fall into a big bottleneck. The higher the energy ratio of the power battery company, the higher the cruising range. However, is the higher the energy ratio and the longer the cruising range, the better it is, or is it better for this market? Hong Bin believes that it is not necessarily proportional to the promotion. When promoting electric vehicles, consumers should be more concerned with the provision of a mode of travel or a proposal, rather than requiring electric vehicles to completely replace gasoline vehicles. More should be It is to consider the solution to the travel mode. The country should be very aware of this problem. By 2020, the domestic charging station will be developed to a scale of 200,000. If it can be done within 1 km, there will be a charging pile to make a fast charge. Hong Bin said that it is 400 km electric. The car is enough.
Hong Bin, Deputy Minister of the Oriental Nissan Qichen Division
Liao Zhenbo: Requires high quality and low cost of battery
The car factory and the power battery manufacturer have done a lot of hard work, and the battery price is 1 yuan, which means that the battery core is about 8 cents, 6 to 5 cents to 8 cents. While requiring the battery energy density to achieve 300Wh/kg, 350Wh/kg, 2000, 3000 cycles of life is required, and the safety is very good, the cost is required to be lowered, and all the requirements are superimposed on the battery, which is contradictory. For example, when the energy density is up, the number of cycles is reduced, and security also causes some problems. Therefore, from a comprehensive perspective, Liao Zhenbo believes that one dollar is more challenging. At the same time, he also said that for the battery company is the customer first, the car manufacturers have such a demand, the battery factory is also trying to achieve. From the current point of view, the state's subsidies should continue for another year or two, and the automakers will also understand the power battery companies, so the profit of the battery factories is still guaranteed.
Mr. Liao Zhenbo, Vice President of BAK Battery
Deng Lunhao: 8 billion watt-hour capacity requirements are open to question
Deng Lunhao said that 8 billion watt-hours, based on 40-degree electricity, is 200,000 vehicles. Taking the sales volume of more than 400,000 vehicles in the Chinese market this year as an example, the two companies will be finished, then the origin of this 8G will actually be It is debatable. The state promotes this requirement in order to have a certain scale effect, and also focuses on supporting several large-scale enterprises. On the one hand, it raises its threshold, on the other hand, it must also take a market-oriented road. Then a large number of listed companies add up all the 18650 listed companies. If they are all 8 billion watt-hours of production capacity, China has 10 million vehicles that are purely electric to balance supply and demand. Now two companies can be satisfied, so Deng Lunhao said that from a personal perspective and a corporate perspective, the 8 billion watt-hour capacity requirement is open to question. Zhuoneng will develop moderately, and will not bite the 8 billion watts of time for the production capacity. If necessary, it will warm up and meet the concept of capacity requirements of the country.
Deng Lunhao, Vice President of Zhuoneng Power Battery
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