Storage-battery control system
In a storage-battery control system, an insulating communication unit couples a controller to a battery module constituting a storage battery unit that outputs a predetermined high voltage value. A power supply line is further provided for supplying electric power output from a controller DC/DC, i.e., a controller-side voltage converter for the controller, to the battery module, so that electric power is collectively supplied via the power supply line to a module CPU and a module-side insulating circuit both consuming electric power in the battery module. A secondary battery in the battery module supplies electric power to only a cell-voltage detector.
1. A storage-battery control system comprising:
a storage battery unit constituted by a plurality of battery modules to output a predetermined high voltage value;
a controller; and
an insulating communication unit configured to couple the storage battery unit and the controller, wherein:
each of the plurality of battery modules includes a secondary battery, and a module-side insulating circuit coupled to the insulating communication unit,
the controller includes a low voltage power supply unit, a controller-side voltage converter for converting a voltage of the low voltage power supply unit into a controller-side predetermined operation voltage value, and a controller-side insulating circuit coupled to the insulating communication unit,
the insulating communication unit is disposed between the plurality of battery modules and the controller, is electrically insulated from the secondary battery by the module-side insulating circuit, and is electrically insulated from the low voltage power supply unit by the controller-side insulating circuit, and
each of the plurality of battery modules includes a first path for supplying electric power output from the controller-side voltage converter to at least the module-side insulating circuit among module-side circuit elements within each of the battery modules, and a second path for supplying electric power to a predetermined module-side circuit element other than a module-side circuit element which receives electric power from the first path in the battery module from the secondary battery of the battery module.
2. The storage-battery control system according to claim 1 , wherein,
the module-side circuit elements include a module-side controlling circuit for controlling each of the plurality of battery modules internally, and the module-side insulating circuit,
the module-side insulating circuit transmits data output from the module-side controlling circuit to the controller-side insulating circuit, and
electric power output from the controller-side voltage converter is supplied to the module-side insulating circuit and the module-side controlling circuit.
3. The storage-battery control system according to claim 1 , wherein,
each of the plurality of battery modules includes a power supply path switching circuit for switching electric power supply from the second path to the first path in a part of the module-side circuit elements, the part of the module-side circuit elements having been receiving electric power from the second path, and
the controller detects a discharge-target battery module based on module voltages of the plurality of battery modules, and, on the discharge-target battery module, urges the power supply path switching circuit to supply electric power from the secondary battery to the predetermined module-side circuit element, while, on each of the plurality of battery modules other than the discharge-target battery module, urges the power supply path switching circuit to supply electric power output from the controller-side voltage converter to the predetermined module-side circuit element.
4. The storage-battery control system according to claim 3 , wherein,
the part of the module-side circuit elements in which electric power supply is switched from the second path to the first path, is the module-side controlling circuit.
5. The storage-battery control system according to claim 3 , wherein,
when a voltage difference between a highest module voltage, among the module voltages of the plurality of battery modules, and a target value is equal to or greater than a preset threshold, the controller sets one of the plurality of battery modules which has the highest module voltage to a discharge target.
6. The storage-battery control system according to claim 5 , wherein,
a lowest module voltage, among the module voltages of the plurality of battery modules, is set to the target value.