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What is wireless charging technology for 402030 polymer battery?

Wireless charging technology for lithium-ion batteries

Wireless lithium-ion battery charging technology is a technology that uses magnets to charge devices without the help of wires. Wireless charging technology originates from wireless power transmission technology. It uses magnetic resonance to transmit charge in the air between the charger and the device. The coil and capacitor form resonance between the charger and the device to achieve efficient transmission of electric energy.

Wireless charging is mainly divided into static and dynamic. Static charging means that electric vehicles can be charged by parking them in parking spaces. Dynamic charging means that they can be towed on highways in the future to achieve charging while driving. At present, the static wireless charging technology is the closest to mass production. The charging efficiency can reach up to 95.4%, which is the highest efficiency that can be achieved in the laboratory, and the minimum is not less than 85%. Therefore, this charging efficiency is basically comparable to that of wired charging. Dynamic wireless charging is expected to be industrialized in three to five years.

There are three basic principles of wireless charging technology: electromagnetic induction, magnetic field resonance and radio wave.

The electromagnetic induction type mainly uses the principle of electromagnetic induction to generate a certain current on the secondary coil through a certain frequency of alternating current on the primary coil, thereby transferring energy from the transmitting end to the receiving end. The most common battery charging solution currently uses electromagnetic induction. In fact, there is not much mystery in the technical implementation of electromagnetic induction solutions. BYD, a local company in my country, applied for a non-contact inductive charger patent as early as December 2005, which used electromagnetic induction technology.

The principle of magnetic field resonance is to adjust the energy transmitter and the energy receiver to the same frequency, or resonate at a specific frequency, so that they can exchange each other's energy. The diameter of the coil used in this experiment reached 50cm, which is not yet commercially available. If the coil size is to be reduced, the receiving power will naturally decrease.

Radio wave charging technology is a relatively mature technology at present. Similar to the crystal radio used in the early days, it mainly consists of a microwave transmitter and a microwave receiver, which can capture the radio wave energy rebounded from the wall and maintain a stable DC voltage while adjusting with the load. This method only requires a transmitter installed on the wall plug and a mosquito receiver that can be installed on any low-voltage product.

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