In China, it is very popular to share the power bank in mainland China. After scanning the QR code and paying a certain fee, we can take it off to charge the mobile phone.
After scanning the QR code and successfully paying, the chip shrinks the solenoid that locks the power bank, so that the power bank is in the unlocking state, and we can easily take it.
This is a very small solenoid because it requires a very small size and it needs to be very cheap. Each device sharing the power bank needs more than 20 solenoids.
Our company through independent research and development, successfully developed a small solenoid, now has mass production, the daily supply capacity is 50K. If you have new needs, please let me know