BATTERY PACK, ELECTRIC TOOL AND CHARGING DEVICE

The present disclosure provides a battery pack, an electric tool, and a charging device. The battery pack comprising a housing having a connecting portion configured to match and connect to a tool or a charging device, wherein the connecting portion comprises a first connecting terminal, a second connecting terminal, a third connecting terminal, a fourth connecting terminal, a fifth connecting terminal, and a sixth connecting terminal; a first battery cell group and a second battery cell group are disposed in the housing, and a quantity of battery cells electrically connected in series in the first battery cell group is equal to a quantity of battery cells electrically connected in series in the second battery cell group; wherein the first battery cell group has a first positive terminal and a first negative terminal, and the second battery cell group has a second positive terminal and a second negative terminal; wherein the first positive terminal, the first negative terminal, the second positive terminal and the second negative terminal match and correspondingly connect to the second connecting terminal to the fifth connecting terminal, respectively; wherein the sixth connecting terminal functioning as a signal terminal is electrically connected to a control module disposed in the housing; and wherein the first connecting terminal functioning as a charging terminal is electrically connected to a first end of a switch, a second end of the switch is electrically connected to the first positive terminal, and a third end of the switch is electrically connected to the control module. The battery pack can externally output two voltages by changing input/output connection lines matching the six connecting terminals.