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Recently, State Grid Co., Ltd. key technology project 'Electric vehicle segment mobile wireless charging system key technology and equipment development' cum 'electric vehicle mobile wireless charging experimental section' successfully passed the acceptance. Experimental section length 181 meters, mobile wireless charging power 20kW, the conversion rate reaches 80%, the magnetic field strength is much lower than the international standard 27uT, and the driving speed can exceed 60km/h. The expert group agrees that the technology and economic indicators of the wireless charging section meet the requirements of the project task book.
In recent years, wireless charging has been in the ascendant, covering smart phones, consumer electronics, smart homes, smart wear, medical equipment, transportation and other fields. With the popularity of electric vehicles, car wireless charging has also received more and more attention. Charging is simple and convenient, that is, stop and charge, no manual operation, no cable dragging, greatly improving the user experience. In addition, wireless charging is not affected by climatic conditions, and can be safely charged in rain and snow. Especially electric vehicles The rapid development of driverless technology has made wireless charging a necessity.
With the development of wireless charging technology, electric vehicles do not need to be deliberately charged, and they can be charged on the road every day. The benefits are many. First, the battery can be 'burdened', because the car can be charged anytime and anywhere, so the large-capacity battery Not so necessary, the load of the vehicle will also drop; secondly, there is no need to wait for charging. Now, electric vehicle charging can't be as convenient as gasoline fueling, and wireless charging can be turned on and off, reducing the time cost. 2. The cruising range of the electric vehicle is wirelessly extended, and the mileage anxiety problem does not exist.
We know that the first mobile 100-meter electric vehicle mobile wireless charging experimental section developed by State Grid Corporation was officially put into operation. The project aims at the construction and demonstration of electric vehicle wireless charging section, and has solved the mobile wireless charging system magnetic field. Coupling mechanism, high-frequency power conversion and other key technologies, developed a multi-pole narrow power supply rail and a two-phase four-coil wide receiving end coupling mechanism and a high-power high-frequency power conversion device adapted to it, built a variety of analog Road conditions, experimental sections that can be operated in both directions.
The important parameters and data obtained by the State Grid Co., Ltd. wireless charging experimental section will provide a reference for the formulation of relevant standards for wireless charging of electric vehicles, which will help China lead the development of wireless charging technology for electric vehicles, enhance the right to speak, and guide strategic. The research and application demonstration of forward-looking new technologies promote the formation of related supporting industrial chains, solve the problem of 'charging difficulty' of electric vehicles, make electric vehicles more 'grounded gas', and open a new era of wireless charging for long-distance electric vehicles in the future.