Electric vehicles have low energy consumption, but they are difficult to charge and their mileage is short. On January 29th, the reporter learned from Chongqing University that the university has built the first international R&D center for wireless energy transmission technology.
After 12 years, the Institute of Power Electronics and Control Engineering of the Institute of Automation of Chongqing University solved the last meter problem of power transmission and successfully developed a wireless charging/discharging system for electric vehicles that has a leading position in China. Later, as long as the unit is equipped with a device as a hub, WiFi-based wireless charging can be performed for multiple electric vehicles. When running on a road surface equipped with a wireless power supply system, electric vehicles can be charged while running.
On January 29th, the reporter went to the building next to the Bishop’s Building in Area A of Chongqing University. An electric car was parked on the side of the road. He saw a red carpet on the pavement, and a coil under the carpet. At the end of the coil, there is a large sealed box about two meters high. Professor Dai Xin of the Institute introduced that this device that looks like a box is a wireless charging/power supply system device. Plug in the power supply. The electric car above the carpet can run without a battery.
Dai Xin told reporters that this research mainly uses the principle of electromagnetic induction. The coils are laid at a depth of 10 cm below the concrete floor. When an electric car runs on the road, the car automatically acquires electric energy just like a cell phone acquires a WiFi signal.
“In addition, if the wireless power supply system is installed on the road, the electric vehicle can continue to drive, which solves the problem of cruising mileage.†Dr. Zhou Wei, a member of the research team, said that after the technology is mature, the coil guide rails will be laid on ordinary roads and Under the high-speed road, when electric vehicles are running on these roads, the system will automatically provide wireless power to the car. The fuel car is like running on a normal road and is completely unaffected.
“However, there are many technical difficulties in the wireless power supply technology of electric vehicles, such as the realization of radio transmission in large areas, control and communication between wireless power supply systems and electric vehicles, etc. It will take a while to reach full maturity in the market. "Dai Xin said.
It is understood that this 70-odd R&D team consisting of professors, doctors and masters is now aiming to promote the application of this technology.
A few days ago, Chongqing City subsidized new energy vehicles. The new energy cars received the highest subsidies from the central and municipal governments for 60% of the car's selling price. With national and local subsidies for new energy vehicles increasing, new energy vehicles will appear in more families in the future.
It is understood that there are 200 AC charging piles in Chongqing and 9 fast charging stations. Whether or not an electric vehicle can be charged and cruising nearby is almost the wish of every electric vehicle owner.
safer
WiFi type charge leakage
Dai Xin introduced that at present, electric vehicles will be charged to a fixed charging pile, compared with the existing charging point is a cable charging method, wireless WiFi charging more secure.
“Charging pile cable will cause leakage due to aging, rain and snow, forgetting to remove the connector after charging, accidentally pulling the connection cable, etc., causing a safety accident.†Dai Xin told reporters that the wireless charging coil can be completely Closed insulation is completely inaccessible to people, so it is safe and will not leak electricity.
very healthy
People will not be exposed to radiation
Does WiFi charging bring radiation?
Dai Xin explained that the coil is not always in the power supply state. When the car passes through, it will only be sensed within a certain range. No matter whether it is a pedestrian or a vehicle, it will not be affected by radiation.
big-amplitude
40% running can also charge
The coil is laid under the ground and has a fixed coil track.
In the laboratory, Chongqing Evening News reporter learned that electric vehicles must run in the coil track to walk. About crab-like walk, run too far, will not feel.
What is the width of the allowable deviation? Dai Xin said that the width of the coil track is about the same as the width of the vehicle chassis, allowing 40% lateral deviation.
Payment of electricity
Receiver feedback terminal charges
If the coil track is laid under the ground in the prescribed road section, or if it is covered in full, the electric vehicle will pass through and enter the WiFi power zone. Then the problem arises.
"This is not difficult," said Dai Xin. If that day is reached, then each electric vehicle will have a corresponding receiver. The receiver will show the car, where it is, and where it is located. How much electricity is charged, and then fed back to the terminal to charge for pricing, the owner can even bind the bank card and make online payments. "You don't need to pay in line like a high-speed intersection charge."
cheaper
Run 100 kilometers from the province 48 yuan
“In terms of price, electric vehicles cost much less per kilometer than fuel vehicles.†Zhou Wei calculated the accounts for the reporter, taking the 60-kW version of Tesla Model S and BYD e6 as examples. The cars are all 60-degree battery capacity, probably running 300 kilometers and running about 5 kilometers at a time. According to the Chongqing electricity price calculation, only about 12 yuan will be able to travel 100 kilometers. A 1.6-litre sedan that is common in the market generally has about 60 yuan per 100 kilometers of oil.
Foreign bus station
Has WiFi charging
“In some cities abroad, bus stops have begun to be used early.†On January 29, an engineer from the Technical Center of Changan Ford Motor Co., Ltd. told reporters that a bus would arrive at the site because it had to be docked, and took the opportunity to charge the electricity. Save energy for the next stop.
According to the analysis, if this technology is mature, the application prospect is very wide, especially the popularization of road coils, which will solve the problem of battery life of electric vehicles. "If the garages are used in the future, they can be charged effectively because they have been parked for a long time." Nicknamed that not all road sections are laid on the road, the key to consider is the efficiency of vehicle charging.
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