A charging device comprising:
- multiple battery units;
- each battery unit comprising:
- a battery with a battery shape, comprising a positive electrode and a negative electrode, wherein a charging voltage is provided to the positive electrode and the negative electrode;
- a thermoelectric module with a module shape, comprising a first surface, a second surface, and two voltage input terminals;
- wherein the battery is mounted on the first surface of the thermoelectric module, and the module shape of the thermoelectric module matches the battery shape of a surface of the battery, such that the first surface of the thermoelectric module contacts the surface of the battery;
- wherein a temperature difference is generated between the first surface and the second surface when a supplying voltage is provided to the two voltage input terminals;
- a power module;
- wherein the power module receives an external voltage from an external power source, and the power module converts the external voltage to the charging voltage, the supplying voltage, and a driving voltage;
- wherein the positive electrode and the negative electrode of the battery are electrically connected to the power module to receive the charging voltage, and the two voltage input terminals of the thermoelectric module are electrically connected to the power module to receive the supplying voltage;
- an outer shell, having an inner space, a fan opening, and a vent opening;
- the fan opening and the vent opening communicate with the inner space, and the battery units and the power module are mounted in the inner space;
- a fan device, mounted in the fan opening and electrically connected to the power module to receive the driving voltage;
- wherein
- the battery units are arranged in a rectangular matrix with a space gap between each other;
- wherein the positive electrode of the battery of each battery unit is faced to a first direction;
- wherein the charging device further comprises:
- a positive conducting element, electrically connected to the positive electrode of the battery of each battery unit;
- a negative conducting element, electrically connected to the negative electrode of the battery of each battery unit;
- wherein the positive conducting element and the negative conducting element are electrically connected to the power module to receive the charging voltage.