ELECTRIC POWER SUPPLY DEVICE, METHOD FOR CONTROLLING ELECTRIC POWER SUPPLY DEVICE, ELECTRIC POWER SUPPLY SYSTEM, AND COMMUNICATION BASE STATION BACKUP SYSTEM

摘要

[Problem] To improve the durability and stability of an electric power supply system. [Solution] An electric power supply system, provided with a first electric power supply device and a second electric power supply device for supplying electric power from a power source to a load. The second electric power supply device has a second storage cell and is connected to the first electric power supply device. The first electric power supply device is provided with: a switching unit having an output terminal that can be electrically connected to a first switch and the load; and a power storage device having a first storage cell, a control unit, a second switch, and an external input terminal. The second switch has at least one of: an OFF function of switching off when a control signal from the control unit and/or an external input signal supplied to the external input terminal from the exterior is a signal for switching off the second switch; and an ON function of switching on when both of the control signal and the external input signal are signals for switching on the second switch. When an outage of the power source is sensed, the first switch closes and an electric connection is established between the first storage cell and the output terminal.