As is well known, wireless charging is not a new thing in the mobile phone industry. Wireless car charging is not as popular as mobile phone charging, but it has already attracted many companies to covet this technology.

Overall, there are four mainstream ways of wireless charging: electromagnetic induction, magnetic resonance, electric field coupling, and radio waves. Among them, mobile phones and electric vehicles mainly use two methods: electromagnetic induction and magnetic resonance.

Among them, electromagnetic induction wireless charging utilizes the electromagnetic induction principle of electric magnetism and magnetic electricity, with high charging efficiency but short effective charging distance, and strict requirements for charging location. Relatively speaking, magnetic resonance wireless charging requires lower positioning requirements and longer charging distances, which can support several centimeters to several meters, but the charging efficiency is slightly inferior to the former.

Therefore, in the early stages of exploring wireless charging technology, car companies favored electromagnetic induction wireless charging technology, with representative companies such as BMW and Daimler. Subsequently, magnetic resonance wireless charging technology gradually gained popularity, with representative companies including system suppliers such as Qualcomm and WiTricity.

As early as July 2014, BMW and Daimler (now Mercedes Benz) announced a cooperation agreement to jointly develop wireless charging technology for electric vehicles. In 2018, BMW began producing wireless charging systems as an optional device for the 5 Series plug-in hybrid model. Its rated charging power is 3.2kW, with an energy conversion efficiency of 85%, and it can be fully charged in 3.5 hours.

In 2021, Volvo launched wireless charging experiments using XC40 pure electric taxis in Sweden. Volvo has set up multiple test zones specifically in the city of Gothenburg, Sweden. Charging vehicles only need to park on wireless charging devices embedded in the road to automatically start the charging function. Volvo stated that its wireless charging power can reach 40kW, and it can travel 100 kilometers within 30 minutes of charging.

In the field of wireless charging for automobiles, China has also been at the forefront of the industry. In 2015, Southern Power Grid Guangxi Electric Power Research Institute completed the first wireless charging test lane for electric vehicles in China. In 2018, SAIC Roewe launched its first pure electric vehicle that achieved wireless charging. FAW Hongqi launched the Hongqi E-HS9 in 2020, which supports wireless charging technology. In March 2023, SAIC Smart officially launched its first 11kW high-power vehicle intelligent wireless charging solution.

Tesla is also one of the explorers in the field of wireless charging. In June 2023, Tesla acquired Wiferion for $76 million and renamed it Tesla Engineering Germany GmbH, aiming to leverage wireless charging in a low-cost manner. Previously, Tesla CEO Elon Musk held a negative attitude towards wireless charging and criticized it as "low-energy and inefficient". Now, he also claims that its prospects are broad.

Of course, many car companies such as Toyota, Honda, Nissan, and General Motors are also developing wireless charging technology.

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