In 2020, there were about 360 million vehicles in China, of which 270 million were passenger vehicles, accounting for 75% of the total number of motor vehicles, while the new energy vehicle population was 4.17 million, a year-on-year increase of 9.45%. According to the forecast of the State Grid Electric Vehicle Company, the number of electric vehicles in China will reach 300 million in 2040.

This article mainly conducts research in the field of wireless power transmission for static and dynamic charging of electric vehicles in China.

The orderly guidance of electric vehicle chargingcan greatly increase the utilization rate of grid equip- ment and save nearly 70% of investment. The power battery capacity can reach more than 20 billion kWh, which will provide 12 billion kWh of energy storage and 4.8 million MW of regulation capacity for the grid.

There are several Chinese automotive OEM companies, such as FAW, SAIC, Geely, Changan, Dongfeng, BAIC, GAC, BYD, etc., all of which are involved in the development of wireless charging technology, as well as several independent equipment companies. There are also more than 30 electric vehicle wireless charging equipment suppliers in China, including Xiamen New Page, ZTE New Energy, Huawei Technology, Wanan, Anjie, and Zhonghui.

Some interesting achievements of some of the Chinese companies include:

• SAIC Roewe released the pure electric SUV MAVELX in 2018, equipped with a 6.6 kW EV WPT (wireless power transfer) system. Themodel is also equipped with the AI Pilot intelligent driving assistance system, which has theAI Parking full-function intelligent parking assistance system, offering the perfect combinationof automatic parking and EV WPT. The wireless charging system configured by MAVELX is a front-end product. The vehicle chassis retains the structure, electrical and communication interfaces for the EV WPT. This is the first pure electric vehicle equipped with EV WPT.

• ZXNE is a wholly owned subsidiary of ZTE Cor- poration. It began researching EV WPT technology in 2012 and established an operating company in July 2014. As of August 2019, ZXNE had completed the development of the third-generation EV WPT system. The first-generation products are put in operation. In 2016, it has completed modification and testing with 11 domestic and foreign auto manufacturers.

The development in demonstration sites began in 2015, based on the early days of research and basic technology development. The foundation has led to mature knowledge and a theoretical framework for the operation of wireless charging technologies.

In 2015, EV WPT’s TRL (Technology Readiness Level) curve reached TRL6 in the private domain due to the early mature theoretical system. Since 2019, the development of EV WPT in the private sector has become more mature, and the curve will reach TRL7 in 2020.

In the public application field, a large amount of theoretical knowledge about the application results of WPT on the TRL reached L3 in 2010 and rose to TRL6 in 2019.

There are two main reasons why TRL analysis does not show higher levels:

There is a lack of national and international standards, particularly in interoperability, preventing the wireless charging technology from going all the way to full scale commercialization.There is also uncertainty concerning radiation associated with wireless charging. The sender and the receiver modules are physically separated and the distance between must be overcome with high energy transmission that creates radiation outside the ray beam between the sender and the receiver. It is unclear what outcome this radiation might have on humans and animals. Until this is clear, full-scale commercialization has been put on hold.