BATTERY PACK

A battery pack, which includes: a battery module having a positive electrode terminal and a negative electrode terminal; a first power connector having a first power terminal connected to the positive electrode terminal, a second power terminal connected to the negative electrode terminal and a first auxiliary terminal, the first power connector being configured to be coupled to or separated from a second power connector that is included in an external device; a control unit to determine whether the first power connector and the second power connector are coupled; a first communication connector to input or output a communication signal between the external device and the control unit; and a communication switching unit installed between the control unit and the first communication connector, the control unit turns on or off the communication switching unit in response to the determination result.