2021-05-11

To participate in the Beijing Winter Olympics, electric vehicles are equipped with antifreeze “heart”

By yqqlm yqqlm

Electric vehicles for the Beijing Winter Olympics are equipped with an antifreeze “heart”

To participate in the Beijing Winter Olympics, electric vehicles are equipped with antifreeze “heart”

In January 2019, the all-climate 12-meter pure electric road bus was tested on ice and snow at the Yakeshi test site in Hailar, Inner Mongolia. Photo courtesy of Science and Technology and Huachuang.

Focus on the national key R&D plan “New Energy Vehicles” key special project ②

The success of this extreme cold test indicates that China’s new energy vehicles are Core key technologies such as batteries, low-temperature enthalpy air-conditioning, and full-climate vehicle control are at the world’s leading level, laying a solid technical foundation for new energy vehicles to break through the severe cold forbidden zone.

Sun Fengchun, Professor of Beijing Institute of Technology, Academician of the Chinese Academy of Engineering

Different from the Summer Olympics, during the Winter Olympics, the temperature is as low as minus thirty or forty degrees Celsius (℃), which means 2022 The low temperature environment of the Beijing Winter Olympics will place higher requirements on the start-up and endurance of new energy vehicles.

Facing the application needs of the Winter Olympics environment, under the support of the national key research and development plan “New Energy Vehicles” key special “High-performance pure electric bus power platform key technology and vehicle application” project supported by Beijing Under the guidance of Sun Fengchun, a professor at the University of Science and Technology (hereinafter referred to as BIT) and an academician of the Chinese Academy of Engineering, and a project team led by a professor at the National Engineering Laboratory of BIT and a doctoral supervisor Lin Cheng, a lithium-ion power battery system product independently developed by the project team-all-climate power battery , Can provide strong kinetic energy in extremely cold environment, and install a freeze-resistant “heart” for new energy vehicles.

Develop a heating pole to realize one-button heating in a -40℃ environment

“The chemical reaction of the battery requires a certain temperature, so if the electric vehicle does not take corresponding measures in the -10℃ environment, Can’t work. In order to solve the problems of electric vehicles charging difficulties and inability to start in extremely cold environments, the lithium-ion power battery system products we developed adopt a built-in heating diaphragm to make the battery appear in the third pole, the heating pole, which can be used in One-key heating at ambient temperature of -40°C enables rapid self-heating and cold start.” Lin Cheng said in an interview with a reporter from Science and Technology Daily.

According to reports, in order to solve the series of problems faced by electric vehicles in severe cold environments, Beijing Institute of Technology, Rongsheng Mengguli Power Technology Co., Ltd., Beijing Institute of Technology Huachuang Electric Vehicle Technology Co., Ltd. (hereinafter referred to as Ligong Huachuang ), Beiqi Foton Motor Co., Ltd. and other project team members jointly developed an all-climate battery system. In terms of its principle, it is a little bit “sword going to the front”, in an extremely low temperature environment, let the battery use only a little energy to heat itself. Its working process is equivalent to an internal fast short circuit, so that the battery quickly heats up and activates itself.

In the severe winter of 2018, in Hailar, Inner Mongolia, it was freezing cold and the electric car developed by Lin Cheng’s team was driving on snowy roads. After testing, after the vehicle is allowed to stand for 48 hours in a low temperature environment of -40°C, battery heating is started, and the battery system heats up by 4°C per minute, which consumes 5% of the total energy.

In the same period of 2019, Lin Cheng’s team continued to organize vehicle winter trials in Hailar. The battery system heats up by 7°C per minute, consumes 5% of the total energy, and reduces air conditioning heating energy consumption by 40%.

In early 2020, the team conducted another winter test. Up to now, the lithium-ion power battery system products developed by the project team led by BIT have successfully completed three extreme cold environment tests of all-climate power batteries in Hailar, and the self-heating rate index has reached the international leading level.

Lin Cheng pointed out: “This is a complete set of innovation system involving many core technologies. The team not only conducts research on the control strategy and theory of the heating system, such as the selection and optimization of heating elements, the development of heating loops, and the heating strategy. The research on the vehicle must also be combined with vehicle control. At present, the entire working principle verification of the all-climate power battery system has been completed, and the battery system product prototype has been successfully developed.”

The all-climate developed by the project team Lithium-ion power battery system products, the system energy has exceeded 155 watt-hours/kg, and the power battery at -30℃ can be quickly heated to normal use in about 5 minutes through the one-button heating technology, and the heating energy consumption is not more than 5%. The vehicle can start and drive normally. The whole vehicle product has been announced and put into test demonstration application.

Facing the needs of the Winter Olympics, showing three core technical highlights

Obviously, electric vehicles must meet the application needs of the Winter Olympics, in addition to being able to start, battery life and In addition to effective use, it is also necessary to fully consider the mountainous terrain and topography of the Winter Olympics in Hebei to solve the problem of safe driving of vehicles on mountain roads, icy and snowy roads. In addition, electric vehicles also need to have a higher level of intelligent driving.

“The electric vehicles unveiled at the Winter Olympics must form a technological high ground, showcase the core technology of a new generation of electric vehicles, and lead the development direction of the industry. Cold-resistant, strong power system, and intelligent driving functions will be the winter The three core highlights of the Olympic Games electric vehicles.” Lin Cheng said.

In order to meet the application requirements of new energy vehicles for the Winter Olympics, Science and Technology Huachuang has applied the key technologies of high-performance all-climate electric vehicles to the development of pure electric buses in the Winter Olympics through the integration of production, education and research. This result is already qualified for mass production.

According to the introduction, in terms of the power of electric vehicles in the Winter Olympics, Ligong Huachuang invented the “new dual-motor drive system” and developed an efficient integrated power drive technology for electric vehicles without power interruption. Closely following the practical application needs of commercial vehicles, the results developed are streamlined and compact, with strong torque output capacity, high specific power density, and great potential for energy saving. This is the first in the domestic department. This technology can not only realize automatic gear shifting, but also ensure that the power is not interrupted, which greatly improves the performance of electric vehicles.

Not only that, the electric vehicle for the Winter Olympics also installed an intelligent networked vehicle controller developed by Lihegong Huachuang, which can be seamlessly connected to the Internet and the component network in the vehicle, and has vehicle control, Remote diagnosis, Bluetooth diagnosis, remote FOTA, wireless calibration functions, with multiple encryption and handshake mechanisms to ensure the security of communications and files. Electric vehicles can upload vehicle status and faults through the 4G network to realize remote diagnosis and update procedures.

“According to the team’s vision, wherever the car goes in the future, the information of every internal battery and every circuit can reach the monitoring center, management team and vehicle companies in real time, so as to realize scientific monitoring and management. Anticipating failures in advance.” Lin Cheng said.

Realize mass production and reduce energy consumption by 20% compared with existing similar products.

In early 2020, the Hulunbeier Winter Automobile Test Field in Yakeshi, Inner Mongolia, will launch new energy for the Winter Olympics In the extreme cold environment test of automobile technology, Lin Cheng’s team placed the entire vehicle in an extremely cold environment below -30°C. After 40 hours, the entire vehicle was completely frozen. Field test data shows that the Foton 12-meter electric bus, Yutong 7-meter medium-sized bus, and BAIC New Energy electric small bus can realize fast self-heating start in 6 minutes, and the temperature rise rate exceeds 5°C per minute. The battery heating energy during low-temperature start-up The consumption is not higher than 5%, and the battery does not need to be heated during the driving process. The low-temperature enthalpy air-conditioning heating test of Foton Bus realized that the temperature of the whole vehicle cabin was raised from -30°C to 19°C within 30 minutes. However, the current heat pump air conditioner used in conventional vehicles cannot be started in an environment of -15°C. The three types of vehicles have successfully passed the series of tests for low-temperature heating of all-climate power batteries, air-conditioning heating, defrosting, and climbing, acceleration, braking, and energy consumption under ice and snow conditions.

At the test site seminar, Academician Sun Fengchun said that the success of this extreme cold test marked the core of China’s new energy vehicles in all-climate power batteries, low-temperature enthalpy air-conditioning, and full-climate vehicle control. The key technology is at the world’s leading level, laying a solid technical foundation for new energy vehicles to break through the severe cold forbidden zone. In the future, new energy vehicles will not be afraid of ultra-low temperature and severe cold, and can maintain almost the same driving range as under normal temperature conditions.

Lin Cheng told reporters that small-batch production of all-climate new energy buses has been carried out and trial runs have been conducted in Yanqing and other areas in Beijing. If the all-climate battery technology is widely used, my country’s electric vehicles will be expected to spread to the northwest, northeast and other alpine regions, and even exported to Russia and the Nordic countries.

The official website of the Beijing Municipal Science and Technology Commission shows that after years of technical research, the project team has integrated a full climate battery system, an intelligent vehicle controller, and a power battery based on the verification of the principle of the full climate battery technology. A number of innovative products such as heating control system, two-speed electric drive assembly without power interruption, low-temperature enthalpy air conditioning, aviation aerosol body insulation materials, etc., and solve the problem that pure electric vehicles cannot be charged and discharged under extreme cold conditions, and the entire vehicle cannot Technical problems such as start-up and high energy consumption of air-conditioning. The energy consumption of the whole vehicle is reduced by 20% compared with the existing similar models under operating conditions, and the battery system can operate normally at an ultra-wide ambient temperature of -40°C to 60°C.

It is estimated that by 2022, electric vehicles with high performance and all-climate working modes will be displayed in front of the world, which is expected to become a beautiful scenery at the Beijing Winter Olympics.