| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery system capable of highly accurately monitoring battery residual capacity, without disposing expensive current detecting means such as a shunt resistor and a Hall CT inside a battery pack.SOLUTION: In a secondary battery system, a battery pack 1 is connected to an AC power supply system 10 through a DC filter capacitor 2, a voltage type AC/DC power converter 3 and an AC filter reactor 4. The AC/DC power converter 3 includes a power supply side current detector 5 and a power supply side voltage detector 6 that continuously monitor the AC power supply system 10 and obtain a current value and a voltage value of the system 10, and a control unit 7 for performing current control on the basis of the obtained detection values, for current control for the AC power supply system 10 side. The control unit 7 is provided with a monitoring unit 71 for monitoring charging and discharging power and battery residual capacity of the battery pack 1. The detection values of the power supply side current detector 5 and the power supply side voltage detector 6 are inputted to a calculation unit 72 provided in the monitoring unit 71. |
