Battery swapping station having mode in which battery pack is operated at time of power supply interruption

A battery-pack-based battery swapping station comprising:

• an external power grid configured to supply power;
• at least one charger configured to charge a battery pack;
• a controller configured to perform control such that the power supplied from the external power grid is transmitted to the battery pack and the battery pack is charged with the power;
• a main power source configured to supply power to the controller;
• a first bidirectional direct-current to direct-current (DC/DC) converter, the first bidirectional DC/DC converter being configured to supply direct-current power to the battery pack;
• a first DC/DC converter;
• a second DC/DC converter;
• and
• an alternating-current to direct-current (AC/DC) converter connected to the external power grid, the AC/DC converter being configured to convert current,
• wherein the controller includes a main control unit (MCU) that is located between the AC/DC converter and the first bidirectional DC/DC converter, the MCU being configured to generate a control signal,
• wherein, when the supply of the power from the external power grid is impossible, the controller is configured to perform control such that power stored in the battery pack is supplied to the main power source, and
• wherein, when the supply of the power from the external power grid is interrupted, the MCU operates the second DC/DC converter to change a current direction of the first bidirectional DC/DC converter from the battery pack to the main power source.