Patent ID: 8525358

Claim:
A power module adapted for an electronic device, comprising: a rechargeable battery; an electrical generator configured to connect with a first second cover of the electronic device, generate electricity to charge the rechargeable battery, and comprising: a rotor configured to rotate to cause the electrical generator to generate electricity; and a driving member configured to connect with a second cover of the electronic device, drive the rotor to rotate, and comprising: a mainspring comprising an outside end and an inside end; a receiver defining a first chamber to receive the mainspring and a through hole in a bottom of the chamber, the outside end of the mainspring being attached to an lateral surface of the chamber; a shaft comprising one end passing through the through hole and directly connected to the inside end of the mainspring, and an opposite end connected to the rotor when the first cover is engaged with the second cover, enabling the rotor to rotate in union with the shaft; and a cable comprising one end attached to the shaft with a portion of the cable wound around the shaft, wherein when an opposite end of the cable is pulled, the shaft rotates in a first direction, compressing the mainspring, when the mainspring rebounds, the shaft rotates back in a second direction, and the wound part of the cable is wound back to the shaft.