In the past few years, with the increase in the number of smog days and the increasing intuitive feeling brought about by environmental pollution problems, the Chinese people's awareness of environmental protection has also increased. With its new energy and zero-emission environmental advantages, electric vehicles are increasingly in the hearts of many consumers.
However, the practicality of electric vehicles is not fully recognized by many consumers. The cumbersome and time-consuming charging problems of electric vehicles and concerns about endurance often make consumers discouraged. What if I am in a hurry and suddenly loses power while driving?
Therefore, when the Tesla electric car came out, there were many people who did not dare to act. Even in recent years, the electric car market has become more and more popular. BYD and Smart have appeared in the past, and most consumers are still waiting to see. Due to the limitations of current battery technology, electric vehicles themselves have problems such as high price, heavy body, large space occupied by battery packs, short cruising range, long charging time and frequent charging. The development of science and technology will never stop. At the beginning of this year, the bottleneck of this electric car "difficult to charge" finally ushered in a solution - wireless charging technology. Moreover, the Chinese themselves invented.
"People always have dreams. As a scientific researcher, they must lead the times. Things that were previously unimagined may be realized in a day." Originally, as early as 2012, the Southern Power Grid Guangxi Electric Power Research Institute was 29 years old. Dr. Zhu Wenji and the young research team started the research project of “Key Technologies for Wireless Energy Transmission for Smart Grids” and embarked on the exploration path of “Electric Vehicle Wireless Charging and Power Supply Technology”. After four years of scientific research, at the beginning of this year, the acceptance of the "Key Technology Research for Radio Energy Transmission for Smart Grid" project was completed. Researchers developed a radio energy transmission system engineering design platform and developed a wireless charging device for parking electric vehicles. Successfully built the first small test driveway for wireless power supply in electric vehicles in China, and opened the “last meter” of electric vehicle charging.
As the technical person in charge of the project, Dr. Zhu Wenji said: "In the future, everyone can charge while driving, even electric cars can solve the problem of power supply without the car battery." While charging, the electric car opened the beautiful era of wireless power supply.
The wireless power supply lane of electric vehicles can be promoted and used on fixed bus routes, highways, and scenic roads. Zhu Wenji said: "The wireless power supply lane is similar to a gas station. When the electric vehicle is running low, it can be driven into the lane where the wireless power supply system is installed. It is charged while walking, and the driver does not need to get off the train."
Regarding the safety issue, Zhu Wenji said that there is no direct contact of the wires during the power transmission, and there is no potential for power safety. As for the electromagnetic radiation, it has been considered at the beginning of the system design, and not only meets the international radiation standards after testing by third-party testing institutions. It is also half the standard and will not harm the health of the driver.
Zhu Wenji said that the current electric vehicles mainly use conductive charging. This type of charging with a "tail" requires a charging cable to connect the charger to the electric car. The wireless charging technology that is free from the "tail" of charging can not only install the wireless charging device of the parking type electric vehicle in the parking lot of the garage, the parking lot, the bus stop, etc., thereby realizing the wireless charging during the parking of the electric vehicle; It is also possible to remotely adjust the charging duration and monitor the vehicle status in real time through the system to automatically power off after full charge.
What makes electric car consumers most gratified is that the wireless power supply lane of electric vehicles developed by Zhu Wenji's team is “not critical” and “not squeaky”. Any brand of electric vehicles can be used, and only wireless receiving devices need to be installed. Moreover, the charging time is greatly reduced. For example, an electric vehicle having a total battery capacity of 24 kWh can be charged in less than one hour if it is charged at 30 kW.
The project research process was not always smooth. In 2013, at the time when the project was planned to be completed, Zhu Wenji and her research team found that although the power conversion efficiency was significantly improved compared with 65% before the project, there is still potential to be tapped. At that time, 1 kWh was transmitted from the grid to the car, and some of the inevitable losses were removed, and the car could receive 75%. In the attitude of being responsible for scientific research, Zhu Wenji applied to delay the project for two years. The researchers finally successfully upgraded the power conversion efficiency to 85%, successfully won the wireless power supply technology of electric vehicles, and reached the domestic and even the world's advanced level.
In mid-April this year, the National Development and Reform Commission and the National Energy Administration jointly issued the "Energy Technology Revolution Innovation Action Plan (2016-2030)" and the "Energy Technology Revolution Key Innovation Action Roadmap", which clarified that by 2020, electric vehicles will be wireless. Charging is a breakthrough point and application object, and develops a high-efficiency, low-cost wireless energy transmission system that realizes stop-and-charge, even charging while driving.

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