Docking station and expansion method

A docking station, which is connected to a main control device and a plurality of electronic devices, the docking station comprising:

• a plurality of expansion slots, wherein two terminals of a connector are respectively inserted into each of the expansion slots and a connection port of each of the plurality of electronic devices to electrically connect the docking station to the plurality of electronic devices;
• a detector module connected to the expansion slots and configured to detect a connection between the docking station and each of the plurality of electronic devices to output a detecting signal;
• an operational information module connected to the detector module and configured to obtain an electric quantity of power stored in an internal battery of each of the plurality of electronic devices that are connected to the docking station according to the detecting signal;
• and a processor module connected to the operational information module and wirelessly connected to the main control device, wherein the main control device is disposed separately from the docking station, the processor module is configured to transmit the electric quantities of the internal batteries of the plurality of electronic devices to the main control device from the operational information module, the main control device compares the electric quantities of the internal batteries with each other and accordingly determines an order of using a current detector module to detect a charging current of each of the plurality of electronic devices;
• wherein when the main control device determines that the charging current supplied from the docking station to one of plurality of the electronic devices having a highest priority is smaller than one half of a required current of the corresponding electronic device having the highest priority, the main control device redistributes a ratio of power supplied to the corresponding internal batteries of the plurality of electronic devices through the docking station from a power supply device such that the charging current of the corresponding electronic device having the highest priority increases, wherein the required current depends on a current required for the corresponding electronic device that is executing one or more programs within a time interval.