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Under the general trend of "four modernizations" (electric, intelligent, shared and networked), the global automobile manufacturers are carrying out radical reforms. A number of automobile manufacturers have said that they will focus on the research and development of electric vehicles. For example, they hope that the sales of electric vehicles will account for half of their total global sales in 2025, and Volvo is expected to launch every year in the next five years. By 2030, the annual sales of electric vehicles will exceed 5.5 million, at least 1 million of which are Bev and FCEV. By 2025, the group's products The brand will launch a total of more than 80 brand-new electric vehicles, including 50 and 30 vehicles; the enterprise also announced that by 2025, 38 "environmental protection vehicles" will be put on the market, seven of which are planned to be listed before 2022. It can be seen that major vehicle enterprises are complying with the trend of electric vehicles and vigorously developing electric vehicles. However, in contrast to the ambitious ambitions of car companies, the popularity of electric vehicles is not so high, mainly because of the "endurance anxiety" of car owners. To solve this problem, on the one hand, we need to improve the performance, on the other hand, we need to provide convenient and fast charging facilities. However, no matter at home or abroad, the charging infrastructure is still unable to meet the demand. However, while vigorously building charging infrastructure, we also need to take convenience into account. Therefore, many companies have developed wireless charging technology, and even developed robot charging guns for electric vehicles. (photo source: BMW) BMW once provided a wireless charging facility rental option for the model of BMW 530e iperformance. The charging power of the system is 3.2Kw. It takes about three and a half hours for the full charge of BMW 530e iperformance, and the charging efficiency is as high as 85%. The wireless charging bag includes an inductive charging pad (can be installed in the garage or outdoor), and an auxiliary charging part (carpad) fixed at the bottom of the vehicle. There is no need to contact between the charging pad and the card pad, and the energy can be transmitted within a distance of about 8 cm. The charging pad generates a magnetic field, which induces current inside the card pad, and then charges the high-voltage battery. As long as the vehicle is parked in the correct position above the inductive charging pad and the charging start / end button is pressed, the charging can be carried out. Once the battery is fully charged, the system will shut down automatically. All conductive components of the system are protected from rain and snow, and will not be damaged after driving. During charging, the environmental electromagnetic radiation is limited to the vehicle chassis. If any foreign matter is found, the charging pad will be permanently monitored and closed. Apple (photo source: patentlyapple. Com) in July 2019, apple obtained a patent called "wireless charging system matching", that is, wireless charging system for cars. Apple's solutions and inventions include a system in which the car is equipped with a control circuit that controls the steering and propulsion systems. The control circuit can use the steering and propulsion system to park the vehicle in the parking space, and the power can be transmitted wirelessly from the wireless power transmitter in the parking space to the wireless power receiver installed on the vehicle body. During parking, the control circuit will use sensors to measure and collect information about the efficiency of wireless power transmission. According to the sensor measurement information and the corresponding wireless power transmission efficiency measurement information, the historical vehicle wireless power transmission matching information can be updated. In the next stop, the historical vehicle wireless power transmission matching information can help to park the vehicle in the position with the highest power transmission efficiency. If necessary, it can park the vehicle in different parking spaces and collect other vehicle wireless power transmission matching information. Samsung (photo source: patentlymobile. Com) surprisingly, South Korea's SamSung company also won a patent on wireless charging devices for cars in 2019. The wireless charging device can transmit the electric energy in the form of electromagnetic wave to the device without transmission line. In wireless charging, due to the lack of alignment between the internal parts of wireless charging, the efficiency will be reduced, and heat will be generated at the same time. Generally, fans can be used to cool the wireless charging equipment by forced convection of air. However, in the forced convection scheme, due to the limited air channel of wireless charging equipment, the cooling efficiency may be limited. If the cooling of wireless charging equipment is insufficient, it will bring some restrictions in use. Samsung's invention provides a wireless charging device, which can reduce the heat generated during wireless charging, that is, improve the cooling efficiency. In addition, a supporting device is also provided. For the wireless charging device installed on the vehicle, even if the vehicle vibrates or shakes during driving, the supporting device can be used to charge the external device wirelessly. In addition to the wireless charging technology mentioned above, some organizations and companies have specially designed robot charging guns for cars because some drivers still need to drive their cars to designated places for charging. Graz University of Technology (photo source: Graz University of Technology) as early as 2018, Graz University of technology in Austria was working with industry partners to develop a rapid charging system for electric vehicles controlled by robots. Moreover, the system uses a camera system, which enables the robot of CCS to find the charging socket of the electric vehicle and automatically set different parameters, so that the vehicle can be charged one by one. Not only does the car not need to be specially adapted to the technology, but it can also charge the vehicles in different parking spaces in series, even if the vehicles are parked in the wrong position. Electric America said in August 2019 that it would work with electric vehicle fleet charging company stable Auto is working together to build a robot charging solution for autopilot. The goal is to use an 150kW DC fast charging gun attached to the robot solution to charge the self driving electric vehicle without interference. Electrify America will be responsible for evaluating the hardware, network, operation and billing of its charging system, so that the system can match the charging fleet of the automatic driving vehicle. It also provides two 150kW DC fast charging guns to the charging facilities of Stable. Stable will pair robotics with the advanced scheduling software of the electric America charging point, so that the self driving electric vehicle fleet can charge itself without the presence of an operator: the vehicle can park itself anywhere in the standard parking space, and the stable robot will automatically connect the car to the charging gun. Volkswagen (photo source: Volkswagen) recently, Volkswagen group demonstrated a new concept product of mobile robot. No matter where the electric vehicle is parked, the robot can find and charge the vehicle, making every parking space become a charging space. The robot can move by itself, move a 25 kilowatt hour battery pack to the side of the vehicle, operate multiple battery packs at a time, connect the vehicle to the battery pack, and transport the battery pack to the storage place after charging. In addition, the robot is equipped with a number of camera laser scanners and ultrasonic sensors, which can drive automatically and have the ability to identify and avoid obstacles. For users, the charging robot can be summoned through mobile application or v2x communication. Under the wave of electrification and the prevalence of environmental protection, although electric vehicles are constantly developing, the supporting charging infrastructure should also be well deployed, otherwise, the popularity of electric vehicles is just empty talk. That's why in 2019, although the efficiency of China's new energy vehicles dropped by 4%, the charging infrastructure increased by 18.1%. Only with convenient and fast charging infrastructure can we really eliminate the "driving anxiety" of car owners and usher in the electric era.