COMPOSITE POWER STORAGE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a composite power storage system capable of improving regenerative capability and estimating before regeneration a current flowing in a battery at the regeneration.SOLUTION: The composite power storage system includes: a first battery 301 connected to a load 15 through a first switch SW1; and a second battery 302 connected to the load 15 through a third switch SW3. One end of the first switch SW1 is interconnected to one end of the third switch SW3. A second switch SW2 is connected in parallel to the first switch SW1, and a fourth switch SW4 is connected in parallel to the third switch SW3. The composite power storage system further includes: means 307-310 for detecting each current and voltage of the batteries 301, 302; and a controller 311 for performing on/off control of each switch SW1-SW4 on the basis of the current and the voltage detected by the above means.