According to an embodiment of the present disclosure, a power conversion device included in a power system may include a conversion circuit configured to transform a direct current (DC) voltage output from batteries, and a balancing circuit connected to a primary side of the conversion circuit and configured to balance states of charge of the batteries, the balancing circuit may perform driving so that a balancing target battery among the batteries is charged or discharged based on a gate signal for the conversion circuit, and the balancing target battery may be connected to the balancing circuit based on an average voltage of the batteries.

An energy conversion device with an integrated active cell balancing circuit. The energy conversion device comprising a cell balancing circuit adapted to be connected to a plurality of cells of a battery, where the cell balancing circuit forms a DC bridge. A transformer, having a primary winding forming a portion of the cell balancing circuit, couples energy to a secondary winding. The secondary winding forms a portion of a resonant cycloconverter configured to convert the coupled energy to an AC output.

A battery control apparatus according to the present disclosure includes a plurality of switching circuits connected in series to a plurality of battery packs; a plurality of sensing circuits to generate a sensing signal indicating a voltage and a current of each battery pack; and a control circuit to determine the voltage, a state of health (SOH) and a state of charge (SOC) of each battery pack. According to an embodiment of the present disclosure, in the selective parallel connection control for at least one of the plurality of batteries, it is possible to reduce a difference in SOH between the plurality of batteries.

Embodiments that provide advanced charging of energy source arrangements for energy storage applications are disclosed. The embodiments can be used within energy storage systems having a cascaded arrangement of converter modules. The embodiments can include the application of pulses to an energy source of each module of the system. The pulses can be applied for a duration sufficient to initiate an electrochemical reaction. Feedback based pulse control embodiments are also disclosed.

A battery management system comprising: at least one battery comprising two or more sets of cells, each set of cells comprising one or more cells; a multiplexing switch apparatus connected to each set of cells; and at least one controller configured to use the multiplexing switch apparatus to selectively discharge the sets of cells based on at least one criterion. A battery pack comprising: at least one battery comprising two or more sets of cells, each set of cells comprising one or more cells; and an integrated switching control system comprising at least one switch connected to each set of cells, wherein the integrated switching control system is configured to control the at least one switch to discharge the sets of cells sequentially or selectively based on at least one criterion. A battery management method or a battery pack control method.

The present disclosure discloses a balancing control method, apparatus, and system for a battery cluster, and belongs to the field of energy storage systems. The balancing control method for the battery cluster includes: obtaining at least one of a first actual state of charge and an actual state of health of each battery cell, and a second actual state of charge of each PACK; controlling, by a first balancing module based on the at least one of the first actual state of charge and the actual state of health, at least one of state of charge balancing and state of health balancing of each battery cell; and controlling, by a second balancing module based on the second actual state of charge, state of charge balancing of the PACK.

Improved systems and methods for balancing a state of charge (SOC) of a plurality of batteries are disclosed. For example, a system may include multiple battery strings connected in parallel to one another through a common bus. Each battery string may include a power converter and multiple battery modules connected in series. The power converter may be configured to regulate the combined power output of the battery modules. Each battery module may include multiple relays that may be controlled to discharge, charge, and/or bypass that battery module. Collectively, the power converters of the battery strings and the relays of the battery modules may be controlled to balance the battery strings with one another and to balance the battery modules within each of the battery strings.

Discussed is an energy storage system that may include a plurality of first battery racks; a central DC/DC converter connected to the plurality of first battery racks and configured to perform power conversion; a plurality of second battery racks; and a plurality of DC/DC converters connected to the plurality of second battery racks respectively and configured to perform power conversion. Here, the central DC/DC converter and the plurality of DC/DC converters are connected in parallel to a DC bus connected to at least one of a power conversion device (PCS) and a power generation device.

A battery voltage equalization device 1 includes: a transformer T including a primary winding T1 into which the output voltage of a battery pack BP is inputted and a plurality of secondary windings T2 corresponding to each of batteries B; a conversion circuit 2 that converts an AC voltage outputted by the secondary windings T2 to a DC voltage; a cutoff circuit 3 provided to cut off a conductive pathway from the conversion circuit 2 to the batteries B; and a control unit 5 that controls the energization of the primary winding T1, wherein the cutoff circuit 3 includes a first switch SW1 and the second switch SW2 which are provided in series on the conductive pathway and which are opened or closed by the control unit, a first body diode Db1 and a second body diode Db2 of which the same terminals are connected to each other and which are respectively connected in parallel with the switches, and a surge suppression resistor Rss connected in parallel with the first body diode Db 1 or the second body diode Db2 for which the direction of charging current to the batteries B is the forward direction.

A circuit includes three battery groups. A first battery group is coupled to an input port. A negative electrode of a second battery group and a third battery group that are connected in parallel to each other is grounded, and a positive electrode of the second battery group and the third battery group is coupled to the first battery group through a switch. A negative electrode of the first battery group is further grounded through a switch. In addition, the input port is coupled to an output port through a buck circuit, the first battery group and the second battery group that are connected in parallel are coupled to an output of the buck circuit through a switch, and the first battery group is coupled to the output of the buck circuit through another switch. The output port is coupled to the output of the buck circuit.