Abstract: The present invention relates to a battery module balancing method using a single inductor. The battery module balancing method can balance a plurality of battery cells using a single inductor in each of battery modules having modularized battery cells, and balance the plurality of modules using a single inductor. Thus, the battery module balancing method can reduce the number of balancing operations and raise balancing power, thereby improving balancing efficiency.

Abstract: The present invention relates to a technique for implementing a bidirectional DC-DC converter applied to an energy storage system. The bidirectional DC-DC converter includes a magnetically coupled inductor and a charging/discharging voltage storage unit between a DC link power supply and a battery power supply, and implements a high gain through a two-step voltage transformation process when a charging process or discharging process is performed. Thus, the bidirectional DC-DC converter can reduce the construction cost of the battery cell, guarantee a high voltage available range, and reduce the influence of leakage inductance.

Abstract: The present invention relates to a battery cell balancing circuit for balancing battery cells of a battery pack using a single inductor. The battery cell balancing circuit includes a first access unit, a second access unit and an electrical energy transfer unit for an electrical energy path of a battery pack. The battery cell balancing circuit selectively connects a strong cell or weak cell of the battery pack to a single inductor by controlling switching operations of switches of the first and second access units and the electrical energy transfer unit, thereby performing battery cell balancing. Thus, the power efficiency of the battery pack can be improved, and the size and price thereof can be reduced.

Abstract: The present invention relates to a technique for implementing a bidirectional DC-DC converter applied to an energy storage system. The bidirectional DC-DC converter includes a magnetically coupled inductor and a charging/discharging voltage storage unit between a DC link power supply and a battery power supply, and implements a high gain through a two-step voltage transformation process when a charging process or discharging process is performed. Thus, the bidirectional DC-DC converter can reduce the construction cost of the battery cell, guarantee a high voltage available range, and reduce the influence of leakage inductance.

Abstract: The present invention relates to a technology for implementing a bidirectional DC/DC converter in an ESS (Energy Storage System). According to the present invention, a two-phase interleaving technique and a ZVS (Zero Voltage Switching) cell are used to implement a high-efficiency bidirectional DC/DC converter, high-efficiency energy conversion can be performed through a plurality of voltage transformation processes, ripple can be reduced to stably exchange energy, the interleaving technique is used to reduce input current ripple and output voltage ripple, and conduction loss can be reduced under a relatively high load.