Global new energy vehicle sales topped 1 million for the first time in 2017.
Wireless charging technology is one of the technologies driving the development of new energy vehicles.
Since the 19th century, the concept of wireless charging technology has been put forward, and research institutions have been carrying out research and development;
After 2007, wireless charging technology entered the stage of rapid development;
Around 2010, the auto industry began to use related technologies.
Wireless charging has become a hot spot in recent years, and many component suppliers, car companies and technology companies have begun testing wireless charging for new energy vehicles.
The hyundai kia us technology center in South Korea is reportedly testing the car's wireless charging on April 10.
Wireless charging, while still an emerging technology, does not mean that only expensive luxury cars are available.
Recently, kia motors announced after 3 years of quick charge wireless technology research and development, now they have the same Mojo mobile wireless charging technology companies in the United States and the energy efficiency and renewable energy office, on a Soul electric vehicle fleet for wireless charging test work, Soul electric cars is also the current south Korean automakers sold in only an electric vehicles.
Kia's wireless charging technology can deliver more than 10 kilowatts of power to cars, with charging efficiency up to 85 percent.
It is worth noting that even if there is a deviation from the charging device during parking, it will not affect the normal charging process, which is definitely good news for drivers with poor parking technology.
The wireless charging of electric cars is similar to that of mobile phones. The transmittercoil will be installed on the ground and the receivercoil will be installed in the car. When the two coils are connected in a straight line, the electromagnetic field will be formed between the transmitting coil and receiving coil, and the power transmission will be realized.
But like wireless charging of mobile phones, electric vehicles also suffer energy loss during wireless charging, so automakers and research institutes are now trying to improve charging efficiency as much as possible.
Kia also admitted that the wireless charging system is not yet ready for mass production, but that there have been significant improvements in energy output and efficiency.
At the end of 2017,China Continental Motors announced that it will introduce a wireless inductive charging pad with sensors. It is understood that this wireless charging network system mainly relies on the charging board placed underground to emit electromagnetic, the induction coil on the car receives the electromagnetic and uses the principle of electromagnetic conversion to charge the vehicle battery. The system, combined with a micro-navigation device, allows the vehicle to accurately stop above the charging pad, which is 10 times more accurate than conventional parking assistance systems.
Continental said that the wireless charging system can reach 11 kW, the efficiency is up to 90%, charging for 90 seconds for 1 mile, and 20 kilometers for 20 minutes. It is reported that the technology has been installed on the BMW 530e model, and will be applied to some models of Mercedes-Benz in the future. In addition, Continental is currently researching the construction of a wireless charging transmitter for the parking lot so that the electric vehicle can be charged a small amount at any time while driving.
Evatran's Plugless Power System
As early as 2016, Evatran developed the Plugless Power system to provide wireless charging for the Tesla Model S. The system consists of two parts, a charging pad and an adapter. The charging board is placed on the ground or in the parking space and connected to the power supply via a cable; the adapter needs to be installed on the bottom of the electric vehicle by a professional. Simply put, it is through the adapter to accept the power of the charging board to achieve wireless charging. After the installation is complete, the user can charge the car by simply parking it on the charging pad. The charge per hour is 20 miles, and the Model S is about 10 to 12 hours, depending on the battery capacity.
According to reports, Evatran provides a wireless charging system with wireless sensing of 7.2 kW per hour, which is enough to guarantee the daily charging of the MODEL S.
Dynamic wireless charging: side charging
In May 2017, Qualcomm announced that it has completed the test of wireless charging in electric vehicles, that is, adding inductive charging equipment on the road, so that the car can be charged while driving. It is reported that at 100Km speed, it can reach 20 kW of wireless charging power, and tested the wireless charging of two vehicles in motion at the same time. Unlike most inductive charging, Qualcomm Halo technology provides high energy transmission in the air and is suitable for a wide range of vehicles. It features a multi-coil design for efficient energy transfer even if the charging board is not aligned with the vehicle.
WiTricity is a start-up company born out of the MIT lab, specializing in wireless charging technology for more than 10 years. Mainly based on magnetic resonance-based wireless charging technology, that is, using the near-field spatial magnetic field for energy transfer, through the selective energy exchange between the highly coupled resonators, the precise adjustment and matching between the power supply and the receiving device, currently has 245 patents. WiTricity's wireless charging is similar to Qualcomm's Halo technology and is therefore a competitor. However, WiTricity does not intend to manufacture the hardware used in the car's wireless charging system. Instead, it licenses its intellectual property to others and provides partners with a reference design for building hardware. At present, WiTricity has cooperated with Toyota, GM and Nissan.
Wireless charging for cars is promisin
It is understood that the advantages of wireless charging are mainly reflected in three aspects:
Is first of all high security, because wireless charging requires no unplugging process, and is free from weather and extreme environments such as rain and snow, and can be used in complex conditions.
2 is high reliability and wireless charging has no mechanical wear compared to wired charging.
Third is convenience, which can realize automatic charging and solve the problem of driverless last kilometer convenience.
However, in the process of accelerating the development of wireless charging industrialization, it encountered the constraints of ununified standards, little engineering practice and high application cost.
Although facing a lot of difficulties, it is probably only a matter of time before wireless charging technology is widely used and popularized in the context of the development of new energy vehicles.