Patent ID: 9257863
Filing Date: 2016-02-09
CPC Classification: H01M,H02J,Y02E

Claim Text:
1. A storage battery system comprising: a plurality of storage battery units connected in parallel and connected to a DC bus, which is connected to an inverter; and a coordination control unit configured to generate coordination information for determining an output target value of current or power with which each storage battery unit outputs in a charge direction or a discharge direction in order to approximate a bus voltage value to a predetermined target voltage value, and transmit the coordination information generated to the storage battery units, the bus voltage value being a voltage value of the DC bus, wherein said each storage battery unit includes: at least one storage battery; and a DC-DC converter, which is provided between the at least one storage battery and the DC bus, and which controls charging and discharging of the at least one storage battery based on the coordination information, the DC-DC converter includes: an output determining unit configured to determine, based on the coordination information transmitted by the coordination control unit, the output target value corresponding to current or power for which the at least one storage battery connected to the DC-DC converter is caused to output; and a control unit configured to cause the at least one storage battery to output the current or the power corresponding to the output target value, and the coordination control unit is configured to cause directions of current or power output in order to approximate the bus voltage value to the target voltage value to be in an identical direction in all the storage battery units, by transmitting the coordination information to the storage battery units, the identical direction being either in the charge direction or in the discharge direction.