The coil behind the battery is the wireless charging coil, also known as the Qi coil. The coil is a magnetic field generating device that picks up the electromagnetic waves emitted by the wireless charger and converts them into electricity.
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During wireless charging, the wireless charger generates current on the coil through magnetic induction, and then converts the current into electromagnetic waves, which are then transmitted to the wireless charging coil of the mobile phone, and then converted into electrical energy by the coil to be stored in the battery. Compared with the traditional charging method, this method has the advantages of high charging efficiency and more convenient use.
The back of the wireless charger coil is, of course, a cooling fan.