STORAGE BATTERY EQUALIZATION DEVICE CAPABLE OF CHARGING BATTERY PACK INCLUDING STORAGE BATTERY MODULES HAVING DIFFERENT OUTPUT VOLTAGES IN SHORT TIME

摘要

A storage battery equalization device is provided with: a battery pack including a plurality of storage battery modules; a plurality of equalization circuits corresponding to the respective storage battery modules, each including a DC/AC mutual converter circuit, a variable capacitor, and a transformer; external wirings interconnecting secondary windings of the transformers; voltage monitors each being connected across both electrodes of a corresponding storage battery module; and an equalization control unit. The equalization control unit determines equalization groups, each including one or more storage battery modules for discharging and one or more storage battery modules for charging, sets one of electrostatic capacitance values to the variable capacitors for each equalization group, the electrostatic capacitances corresponding to resonance frequencies of the equalization circuits, and controls a frequency of an alternating current outputted from the DC/AC mutual converter circuit of each equalization circuit, to be the resonance frequency of the equalization circuit.

主权项

1: A storage battery equalization device, comprising:
a battery pack including a plurality of storage battery modules connected in series, each of the plurality of storage battery modules including at least one storage battery cell; a plurality of equalization circuits corresponding to the respective storage battery modules, each of the plurality of equalization circuits comprising a DC/AC mutual converter circuit connected in parallel to a corresponding one of the storage battery modules, a variable capacitor connected to the DC/AC mutual converter circuit, and a transformer having a primary winding connected in series or parallel to the variable capacitor; external wirings interconnecting secondary windings of the transformers in parallel to each other; voltage monitors, each of the voltage monitors being connected across both electrodes of a corresponding one of the storage battery modules; and an equalization control unit that:
determines equalization groups based on voltage values measured by the voltage monitors, each of the equalization groups including one or more storage battery modules for discharging and one or more storage battery modules for charging,for each of the equalization groups, sets one of electrostatic capacitance values to the variable capacitors of the equalization circuits connected to the storage battery modules belonging to the equalization group, the electrostatic capacitance values corresponding to resonance frequencies of the equalization circuits, the resonance frequencies being different for the equalization groups, andcontrols a frequency of an alternating current outputted from the DC/AC mutual converter circuit of each of the equalization circuits, to be the resonance frequency of the equalization circuit.