The 17th CEMF Technical Seminar: Development Trends of New Energy Vehicles and Emerging Travel Modes
On September 25-26, the 17th technical seminar "Development Trends of New Energy Vehicles and Emerging Travel Modes" was held in Beijing jointly with the Academy of Sciences of the Ministry of Transport and the Transportation Development Center. Experts from scientific research institutions and energy and transportation industries conducted in-depth discussions on the key issues of China's new energy vehicle development, analyzed the application of charging piles, batteries, distributed energy and distribution networks under the new policy, and the impact on national travel methods. Prospects and traffic-related behaviors were carried out, and the technical practice of light electric passenger vehicles and large and medium-sized electric buses as well as the technical path of electric vehicle battery recycling were discussed, providing reference and support for the research on China's low-emission development strategy and related model research in 2050 .
Emissions from the transportation sector, especially from road transportation, account for a large proportion of my country's total greenhouse gas emissions, and the proportion continues to rise. As an important measure to control greenhouse gas emissions and implement my country's commitments under the "Paris Agreement" on climate change, relevant departments and some cities in my country have introduced a series of policies to encourage the development and consumption of new energy vehicles. Since 2012, my country's new energy vehicle industry has entered a period of rapid development, and has become the world's largest producer and seller of new energy vehicles. In recent years, my country has made remarkable progress in the research and development of new energy vehicles such as battery energy density, charging and swapping technology, wireless charging technology, and hub motors.
In order to discuss issues related to the development trend of new energy vehicles and emerging travel modes, the China Energy Modeling Forum (CEMF) and the Transportation Development Center of the Academy of Sciences of the Ministry of Transport jointly held the China Energy Modeling Forum in Beijing on September 25-26, 2018. The 16th Technical Seminar of the Forum Project "Research on China's 2050 Low Emission Development Strategy - Development Trend of New Energy Vehicles and Emerging Travel Modes". Well-known research institutions such as the Energy Research Institute of the National Development and Reform Commission, Shandong Provincial Academy of Sciences, Tsinghua University, and Beijing Institute of Technology, as well as leading companies in the energy and transportation industries such as China Giant Power, Shumeng Workshop, Jiangsu Jiaotong, Didi Chuxing, and Mobike Join meetings and share.
Charging pile, charging behavior, battery, distributed energy and distribution network
Li Lili
Distinguished Researcher, Sichuan Energy Internet Research Institute, Tsinghua University
The development of electric vehicles has brought new opportunities for the interaction and integration of the transportation system and the energy system, and will play an important role in promoting the transformation of the two major industries. Although the threshold of V2G technology (Vehicle-to-grid, vehicle-to-grid) is low, the successful implementation and promotion of V2G depends on the transformation of the entire power system, which in turn will lead to disruptive upgrades in the two major industries of transportation and energy. In the context of the current subsidy decline, the potential for V2G energy storage on the user side is great, with a high input-output ratio and low marginal cost. The successful promotion of V2G requires policy innovation, and also requires the power grid to play a good role as a platform to attract private cars to participate in the market-oriented transaction mechanism of energy storage services.
Liu Jian
Doctor of Energy Research Institute of National Development and Reform Commission
In recent years, the proportion of wind power and solar power in my country's power generation structure has grown rapidly. At present, renewable energy power generation has accounted for 30% of my country's total power generation, and it is expected to reach more than 50% by 2030. At the same time, my country is vigorously promoting the development of new energy vehicles. At present, the total sales volume of new energy vehicles has accounted for about 40% of the world. The use of electric vehicles for energy storage has an obvious effect of peak shaving and valley filling, which can absorb more renewable energy for cities. In order to promote electric vehicle energy storage, it is necessary to introduce real-time electricity prices and conduct platform-based operations on decentralized electric vehicle resources. At the same time, the power grid prepares for the further promotion of V2G applications by distinguishing electric vehicle charging loads from other electricity loads.
Zhang Zhaosheng
Ph.D., School of Machinery and Vehicles, Beijing Institute of Technology
The analysis based on the new energy vehicle supervision and traceability platform shows that due to different travel habits and operating habits, there are obvious differences in the charging frequency and charging capacity of different vehicles. Personal vehicles are mostly charged once a day, and buses and taxis are mostly charged twice. Private cars and time-sharing rental cars mainly use slow charging, buses mainly use fast charging, and taxis and logistics vehicles mostly use a combination of slow charging and fast charging. At present, the charging time of all kinds of cars is mostly concentrated from 11:00 am to 4:00 pm, and from 8:00 pm to 12:00 pm. The average daily mileage of taxis and buses is the longest, followed by logistics vehicles, time-sharing rental vehicles and private cars respectively.
Prospects for national travel patterns and traffic-related behaviors
Ou Xunmin
Associate Professor, Institute of Energy, Environment and Economics, Tsinghua University
A sustainable transportation energy system needs to meet corresponding quality standards in terms of transportation economy, energy supply security, energy efficiency, fuel supply and demand matching, and greenhouse gas emissions. Through the transportation sector energy consumption and carbon emission model (TMOTEC), the individual choice among transportation modes, the change of vehicle energy structure, and the objects and models of transportation services are simulated and analyzed. The total greenhouse gas emissions and emission reduction potential of the transportation sector are relatively high By taking practical and effective emission reduction measures, by 2050, emissions can be reduced by 20%-50% relative to the baseline scenario.
Tan Wen
Chief Engineer of Hangzhou Shumeng Factory Research Institute
Technology and practice of light electric passenger cars and large and medium electric buses
Wang Maike
President of Beijing Shenzhou Judian New Energy Technology Development Co., Ltd.
Compared with the common parallel-connected ternary lithium batteries on electric vehicles, single large-capacity solid polymer power lithium batteries have the advantages of low internal resistance, high safety, easy state detection and monitoring, and large single capacity. Through remote monitoring, staff can view related indicators such as battery health, charging and discharging conditions, which greatly improves battery safety.
Geng Weiwei
Director of R&D Center of Electrification Research Institute of Jiangsu Jiaotong Energy Technology Development Co., Ltd.
The characteristic of the distributed hub drive system is that each wheel has a motor, which outputs power independently. The distributed hub drive system has many advantages. First, it can reduce the driving capacity of a single motor and make the layout of the vehicle more flexible. The second is to simplify traditional components and greatly improve the car-electric design. Third, since each wheel of the distributed hub drive system can turn and output power, multi-wheel steering can be realized, which greatly improves the mobility of the vehicle. Because all the power units are from the battery to the motor, there is no mechanical transmission accessory in the middle, and the driving efficiency is greatly improved.
Traffic light signal regulation is optimized.
Technical path of electric vehicle battery recycling
Xu Shengming
Professor, Institute of Nuclear Energy and New Energy Technology, Tsinghua University
With the rapid development of new energy vehicles, the demand for key supporting components in power batteries is also rising. my country is relatively short of resources such as lithium and cobalt metals needed to manufacture power batteries, and most of them rely on imports. Therefore, the recycling industry of decommissioned batteries has great growth potential in the future. Through the first principles, it is possible to classify and separate metals in decommissioned batteries, purify a single metal, and accurately separate impurities in solutions, thereby greatly improving the efficiency and economy of battery recycling.
Qiao Xin
Researcher at Shandong Academy of Sciences
At present, there are mainly the following problems in battery recycling: the internal structure of the battery is complex, and disassembly is difficult, so recycling manufacturers generally do not tend to disassemble the battery, but prefer to use the whole package. Due to the different battery designs of different manufacturers, they are usually customized according to vehicle models, and the non-standardized design makes it difficult to replace some modules of the battery pack. Since the working status of individual cells in a parallel lithium battery pack cannot be determined, it is difficult to know the health and potential risks of the battery pack. Suppose the technology of using big data analysis and simulating the working state of battery packs is applied to actual production. In that case, it is expected to improve the safety and economy of power batteries for new energy vehicles.
The transportation industry is a fundamental and leading industry for China's economic and social development, and one of the key areas of China's green and low-carbon development. The development of new energy vehicles and changing the way of travel are becoming important ways to reduce pollutants and greenhouse gas emissions in the transportation industry. At this meeting, industry experts and practitioners conducted in-depth discussions on the key issues of China's new energy vehicle development, providing reference and support for 2050 China's low-emission development strategy research and related model research.
