A power storage device 20 comprises: a plurality of power storage elements C1-C6 that are connected in series; energy transfer circuits 40 provided respectively to the plurality of power storage elements C1-C6; a common bus 50 to which the energy transfer circuits 40 of the plurality of power storage elements C1-C6 are commonly connected; and a control device 70. Each energy transfer circuit 40 includes one or a plurality of switching transformers Tr, each switching transformer having a first winding 41A that is connected to the power storage elements C1-C6 and a secondary winding 41B that is connected to the common bus 50. The control device 70 uses the switching transformers Tr of the energy transfer circuits 40 to transfer energy between the power storage elements via the common bus 50, thereby equalizing the voltages of the power storage elements C1-C6. The common bus 50 is in an electrically floating state.

An object of the present disclosure is to perform discharge control that suppresses deterioration in power storage performance of a power storage component by taking the state of power supply equipment into consideration. A power supply apparatus comprises: a power storage unit that stores electric charges from an external power supply; a control unit that controls charge and discharge of the power storage unit; a state determination unit that determines the power supply state of the external power supply; and a voltage detection unit that detects the voltage at the power storage unit. The control unit performs first discharge control to lower the voltage at the power storage unit to a smaller second voltage value if a predetermined time elapses since the completion of drive of a drive unit and the state determination unit determines that the power supply state is not a state of restricting power to be supplied.

Module-based energy systems are provided having multiple converter-source modules. The converter-source modules can each include an energy source and a converter. The systems can further include control circuitry for the modules. The modules can be arranged in various ways to provide single phase AC, multi-phase AC, and/or DC outputs. Each module can be independently monitored and controlled.

Module-based energy systems are provided having multiple converter-source modules. The converter-source modules can each include an energy source and a converter. The systems can further include control circuitry for the modules. The modules can be arranged in various ways to provide single phase AC, multi-phase AC, and/or DC outputs. Each module can be independently monitored and controlled.

Provided are embodiments including a system for balancing DC bus capacitors for converters. The system can include a first 3-phase system, and a second 3-phase system, wherein the first 3-phase system and the second 3-phase system are operably connected. The system can also include one or more DC capacitors coupled to the first 3-phase system and the second 3-phase system, and a controller, wherein the controller is configured to control switching of the first 3-phase system and the second 3-phase system so that an output of second 3-phase system is delayed 60 degrees from an output of the first 3-phase system. Also, embodiments are provided for a method for balancing DC bus capacitors.

The wireless management system for energy storage systems includes a plurality of smart cells arranged into a two-dimensional array and a plurality of distributed management units. The smart cells and management units communicate with each other wirelessly via capacitive coupling (not radio). The communication links have extremely short range (typically under 3 mm), are relatively directional, and are electronically-steerable in the plane of the array. The smart cells may also include at least one power resistor and switch for passive cell balancing. The circuitry in the smart cells is typically incorporated into a flexible sheet that wraps around the energy storage device like a label. This system is extremely reliable because it is massively redundant, fault tolerant, and eliminates the wires used in conventional monitoring systems.

In one embodiment, a system comprising a battery set comprising plural battery cells configured in a circuit; and a control system configured to switch current flow in the circuit from bi-directional flow to and from the battery set to mono-directional flow to or from the battery set based on an over-charging or over-discharging condition.

Disclosed are a battery charging control method and apparatus, and a battery powered device such as an electric vehicle. The method, for each cell in at least one cell of a multi-cell battery, includes: after the multi-cell battery enters a charging stable state, acquiring actual charging electric quantity required for charging the cell to a target voltage; determining a balance time duration for the cell based on the actual charging electric quantity corresponding to the cell, wherein the balance time duration is a time duration required for a cell balance control circuit matched with the cell to control the cell; and controlling the cell balance control circuit matched with the cell to perform electric quantity adjustment on the cell within the balance time duration. The technical problem of low accuracy of balance control on each cell in the multi-cell battery in the related art is solved.

A power storage device includes a plurality of series-connected battery cells and a balance circuit board. The balance circuit board includes: a heat-generating element (1121) that is provided for each of the plurality of battery cells, and is connected with the corresponding battery cell; and a first temperature sensor that is arranged within a range sandwiched between heat-generating elements positioned at both ends in an arrangement direction of a plurality of heat-generating elements (1121).

An apparatus for storing energy includes a plurality of energy storage cells, a switching circuit configured to control a transient voltage support to a battery provided by the plurality of energy storage cells, a charging circuit configured to charge the plurality of energy storage cells, and a processing system. The processing system is configured to control the charging circuit to charge the plurality of energy storage cells, and control the switching circuit to control the transient voltage support of the plurality of energy storage cells to the battery. The switching circuit and the charging circuit provide parallel paths between the plurality of energy storage cells and the battery terminal.