Battery power supply system and method

A battery power supply system for a main system, the battery power supply system comprising:

• a power supply processor electrically connected with the main system;
• plural control switches electrically connected with the power supply processor;
• plural slots electrically connected with the power supply processor and the corresponding control switches, wherein each of the plural slots is connected with the corresponding control switch of the plural control switches;
• and
• plural battery units docked with the corresponding slots,
• wherein the power supply processor defines one of the plural battery units as a fiducial battery unit and defines a voltage value of the fiducial battery unit as a fiducial voltage value, wherein if a difference between the fiducial voltage value and a voltage value of at least one battery unit of the rest of the plural battery units is within a predetermined value, the power supply processor defines the at least one battery unit as at least one selected battery unit, wherein the at least one control switch connected with the at least one selected battery unit is turned on, so that the fiducial battery unit and the at least one selected battery unit are connected with each other in parallel.

A battery power supply method for use in a main system through a battery power supply system, the battery power supply system comprising a power supply processor, an expansion slot module and plural battery units, the expansion slot module being electrically connected with the power supply processor and comprising plural slots, the plural battery units being docked with the corresponding slots, plural control switches being electrically connected between the corresponding slots and the power supply processor, the battery power supply method comprising steps of:

• defining one of the plural battery units as a fiducial battery unit and defining a voltage value of the fiducial battery unit as a fiducial voltage value;
• if a difference between the fiducial voltage value and a voltage value of at least one battery unit of the rest of the plural battery units is within a predetermined value, defining the at least one battery unit as at least one selected battery unit;
• turning on the at least one control switch that is connected with the at least one selected battery unit;
• and
• allowing the fiducial battery unit and the at least one selected battery unit to be connected with each other in parallel.