CHARGE/DISCHARGE CONTROL SYSTEM FOR STORAGE BATTERY ASSEMBLY
A charge/discharge control system for a storage battery assembly includes a plurality of battery blocks each connected in parallel to a charge/discharge main bus via protective resistors, and a plurality of switches connected in parallel to the protective resistors, between the charge/discharge main bus and the plurality of battery blocks. In a state in which the plurality of switches are all on, when one of the plurality of switches turns off and a parallel off occurs, a charge/discharge control device performs processing for throttling the charge/discharge power, that flows to the charge/discharge main bus, in accordance with a pre-set reference. When the parallel off is canceled by the throttling processing, the charge/discharge power is restored.
1 . A charge/discharge control system for a storage battery assembly, comprising:
a plurality of battery blocks connected in parallel with each other to a bus line for charging/discharging;
a plurality of resistive elements which correspond to the plurality of battery blocks respectively and are arranged to be connected to the bus line;
a plurality of switches which correspond to the plurality of battery blocks respectively and are connected to the bus line; to be parallel with the resistive elements, and under a predetermined condition, turn on when a voltage difference between the plurality of battery blocks decreases, and turn off when the voltage difference increases; and
a control part which, in a case where one of the plurality of switches turns off after the plurality of switches are all on, performs processing of throttling a charge/discharge power transmitted/received through the bus line according to a predetermined throttling reference.
2 . The charge/discharge control system for the storage battery assembly according to claim 1 , wherein
the control part performs restoration processing in which the charge/discharge power is restored according to a predetermined restoration reference when the voltage difference between the plurality of battery blocks decreases and the switch that has been turned off turns on again after the throttling processing.
3 . The charge/discharge control system for the storage battery assembly according to claim 2 , wherein
the plurality of switches are, as the predetermined condition, sequentially turned on according to a predetermined order when the voltage difference between the plurality of battery blocks comes to be a predetermined threshold voltage difference or less, and are turned off when the voltage difference between the plurality of battery blocks exceeds the threshold voltage difference.
4 . The charge/discharge control system for the storage battery assembly according to claim 3 , wherein,
when the voltage difference between the plurality of battery blocks decreases to be a restoration threshold voltage difference or less, which is predetermined as a value smaller than the threshold voltage difference, the throttling processing is stopped and the switch that has been turned off is turned on again.