The present application discloses a battery equalization system, a vehicle, a battery equalization method, and a storage medium. The battery equalization system includes: a collection circuit; an equalization circuit; a controller; a charging branch circuit, connected to a charging device and a battery pack; and a first power supply branch circuit, connected to the charging device and the battery equalization system, and configured to supply power to the battery equalization system. When a state-of-charge of the battery pack is full and a cell in the battery pack needs enabling of equalization, the controller controls the charging branch circuit to disconnect, and controls the first power supply branch circuit to keep connected, so that an equalization module performs equalization processing on the cell that needs enabling of equalization.

A vehicle power supply device converts power from high voltage to low voltage by selectively connecting a predetermined power storage element group to a low voltage electric load from a high voltage power supply formed by connecting power storage elements in series. A leakage resistance from the high voltage power supply to the ground is measured when the high voltage circuit is cut by the cutoff means placed between the high voltage power supply and the high-voltage load device. When the value less than a predetermined value, the connection between the high voltage power supply and the high-voltage load device is interrupted, so that electric shock is prevented.

A method for operating a switching arrangement of a rechargeable energy storage system, RESS. The RESS includes parallelly arranged battery packs and the switching arrangement comprising an associated contactor for each battery pack. The contactors are configured to connect and disconnect the battery packs relative a traction voltage bus by closing and opening, respectively, the traction voltage bus being connected to at least one load. The method includes providing a window of opportunity in which no request for powering the load by the battery packs, and no request for charging the battery packs, are allowed to be implemented, in the window of opportunity, preventing the contactors to open enabling equalization due to current transfer between the battery packs, measuring the current transfer between the battery packs, and in response to the measured current transfer, preventing the contactors to open and/or opening the contactors.

A charger integrated circuit for charging a battery device including a first battery and a second battery includes; a first charger configured to generate a first charging current from an input voltage when the input voltage is received from an input voltage terminal, and a battery switch configured to provide the first charging current to the battery device, the battery switch comprising a plurality of transistors for connecting the first battery and the second battery in series or in parallel based on the input voltage, a first both-end voltage of the first battery and a second both-end voltage of the second battery.

A backup power supply device is provided with: first to fifth battery packs connected in parallel; a charger that supplies a charge current to each battery pack; first to fifth charge switches that individually connect and disconnect charge paths of the respective battery packs; and a controller that controls each charge switch. The controller divides the battery packs into a plurality of groups and performs pulse-width modulation (PWM) control of each charge switch at a duty ratio corresponding to the number of batteries in each group to charge the battery packs for each group.

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.

A cell balancing device based on a capacitor network, a cascadable balancing battery pack, and a control method thereof, used for battery pack balancing control, and the battery pack being composed of n battery units connected in series; the cell balancing device comprises: n half bridge circuits, each half bridge circuit being connected in parallel to two ends of a battery unit, the midpoint of each half bridge circuit being connected in parallel to a corresponding switch capacitor, and each half bridge circuit comprising two switch transistors connected in series; an energy storage capacitor network, comprising a basic energy storage capacitor network composed of n switch capacitors connected in series; a chain-type driving capacitor network, one end thereof being electrically connected to one of the half bridge circuits or the energy storage capacitor network, and the other end thereof being electrically connected to a drive pulse generator, and the drive pulse generator being electrically connected to the chain drive capacitor network; and a control logic circuit electrically connected to the battery pack, the drive pulse generator, and a master control panel. Using the present solution, the cell balancing device of the present application has excellent balancing effects, reliable performance, strong universality, and strong scalability.

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.

The present application relates to a battery system and a parallelization method and apparatus thereof. The parallelization method of the battery system includes: acquiring voltages of the battery packs respectively; setting a charging priority of each of the battery packs according to a preset rule and the voltages of the battery packs; and controlling the switching circuit corresponding to the battery pack in the highest charging priority to be turned on to connect a charging loop of the battery pack for charging, and if the voltage of the battery pack currently charged is increased to a value close to the voltage of the battery pack in a next charging priority, controlling the switching circuit corresponding to the battery pack in the next charging priority to be turned on.

A switching unit is included, which is arranged between a first electric storage unit of a first electric storage device configured to be connectable in parallel with a second electric storage device and a wire electrically connecting the first electric storage device and the second electric storage device, and which is configured to switch a electrical connection relationship of the wire and the first electric storage unit. A restricting unit is included, which is connected in parallel with the switching unit between the wire and the first electric storage unit, has a higher resistance than the switching unit, and is configured to cause a current to flow in the direction from the wire to the first electric storage unit and suppress current flowing in the direction from the first electric storage unit to the wire.