Abstract: An energy storage system and an equipotential apparatus thereof, an energy storage device, and a power station. Under a condition that the equipotential apparatus is disposed between a positive direct-current bus and negative direct-current bus of the energy storage system, a potential (or electric potential) of an equipotential node in the equipotential apparatus is between a positive direct-current bus voltage and negative direct-current bus voltage of the energy storage system.

Abstract: A battery system comprises: a control unit and at least one battery, wherein the battery comprises: an electrical box and a plurality of battery cells, a detection unit and a first switching unit that are provided in the electrical box, the plurality of battery cells being connected to form a battery cell assembly; and the control unit is separately connected to the detection unit and the first switching unit for controlling, according to a detection signal collected by the detection unit, the first switching unit to cut off or connect an internal power transmission line and/or an external power transmission line of the battery cell assembly.

Abstract: A grid connection control method of an energy storage apparatus, an energy storage control unit, an energy storage system, and a storage medium are provided and relate to the field of energy storage technologies, where the method includes: sequentially controlling energy storage units of energy storage sub-modules to be connected to corresponding voltage-sharing capacitors in a state in which a main energy transmission circuit is disconnected from a direct-current bus, so as to make the energy storage units pre-charge the corresponding voltage-sharing capacitors; and controlling the main energy transmission circuit to be connected to the direct-current bus under a condition that the voltage-sharing capacitor of each energy storage sub-module meets a voltage-sharing capacitor pre-charge completion condition.

Abstract: A connection control method comprises: acquiring first voltages of battery packs of energy storage modules of an energy storage system; determining, based on the first voltages of the battery packs and a rated voltage value of a power unit of each of the energy storage modules, a charging voltage of each of the power units; and controlling a battery pack of a target energy storage module of the energy storage system to be connected to the energy storage system based on the charging voltage.

Abstract: An energy storage control system includes a plurality of energy storage modules and a plurality of control apparatuses in one-to-one correspondence with the plurality of energy storage modules, where each control apparatus is connected to the corresponding energy storage module, and the energy storage module includes a battery unit and a power unit, the battery unit including at least one battery group. The control apparatus includes a sub-module controller and at least one battery management system in one-to-one correspondence with the at least one battery group, where each battery management system is connected to the corresponding battery group and the sub-module controller, and the sub-module controller is connected to the power unit.

Abstract: A grid connection control method of an energy storage apparatus, an energy storage control unit, an energy storage system, and a storage medium are provided and relate to the field of energy storage technologies, where the method includes: sequentially controlling energy storage units of energy storage sub-modules to be connected to corresponding voltage-sharing capacitors in a state in which a main energy transmission circuit is disconnected from a direct-current bus, so as to make the energy storage units pre-charge the corresponding voltage-sharing capacitors; and controlling the main energy transmission circuit to be connected to the direct-current bus under a condition that the voltage-sharing capacitor of each energy storage sub-module meets a voltage-sharing capacitor pre-charge completion condition.

Abstract: Provided are an energy storage system and a control system and a control method of the energy storage system. The energy storage system includes a converter valve and an energy storage valve, the energy storage valve is connected to a direct-current side of the converter valve, and the control system includes: a coordination control subsystem, a converter valve control subsystem, and an energy storage valve control subsystem; the coordination control subsystem is used for sending an instruction to control the converter valve control subsystem and the energy storage valve control subsystem to work; the converter valve control subsystem is used for controlling, according to the instruction of the coordination control subsystem, the converter valve to work; and the energy storage valve control subsystem is used for controlling, according to the instruction of the coordination control subsystem, the energy storage valve to work.

Abstract: A starting method of an energy storage system is provided. The energy storage system includes at least one energy storage submodule. The energy storage submodule includes a power module and a battery module. The starting method includes: acquiring a first instruction; and controlling the battery module to charge the power module according to the first instruction. Through the starting method, the battery module of the energy storage submodule can be controlled to charge the power module when a power grid is in a completely black state so that the power module can be charged to have the power-on capability, thereby realizing the self-starting of the energy storage submodule and helping to increase the restoration speed of the power grid.

Abstract: A control method of an energy storage system. The energy storage system includes N energy storage modules connected in series, and N is a positive integer greater than 1. The control method includes: acquiring a first parameter of each energy storage module among the N energy storage modules, the first parameter being a parameter related to the power; and conducting balance control on the energy storage system according to the first parameter of each energy storage module.

Abstract: A control method of an energy storage system. The energy storage system includes a plurality of energy storage modules connected in series. The control method includes: acquiring a difference value between a first state parameter of a first energy storage module and a first state parameter of a second energy storage module among N available energy storage modules in the energy storage system, N being a positive integer greater than 1; and conducting balance control on the energy storage system according to the difference value of the first state parameters.

Abstract: A method and device for determining an available capacity of a battery, a battery management system, and a storage medium, relating to the field of battery technologies. The method includes: obtaining the at least one DOD interval corresponding to the SOC interval of the operation of the battery, and the number of cycles and the cycle temperature corresponding to the at least one DOD interval; obtaining a recoverable amount of capacity fade of the battery according to the at least one DOD interval, the number of cycles and the cycle temperature, and determining an actual available capacity of the battery.

Abstract: Provided are a method for suppressing direct current oscillation in a power transmission system and the power transmission system. The power transmission system comprises a sending terminal VSC, a receiving terminal VSC and a direct current energy storage apparatus, wherein the direct current energy storage apparatus is connected in parallel between the sending terminal VSC and the receiving terminal VSC, and the direct current energy storage apparatus comprises a plurality of energy storage submodules. The method comprises acquiring a direct current power oscillation amount of the power transmission system; and controlling, according to the direct current power oscillation amount, the number of the direct current energy storage apparatuses connected to the energy storage submodules of the power transmission system.

Abstract: Provided are a control method for an energy storage system and the energy storage system. The energy storage system includes N energy storage sub-modules, where N is a positive integer greater than 1. The control method for the energy storage system includes: acquiring an SOC and a charge-discharge limiting current of each of the N energy storage sub-modules; and controlling working states of the N energy storage sub-modules according to the SOC and the charge-discharge limiting current of each of the energy storage sub-modules, where the working states include a switched-on state and a switched-off state. According to the technical solution provided by embodiments of this application, the problem of SOC imbalance among the energy storage sub-modules can be solved, so that the utilization rate of the energy storage system is improved.

Abstract: Embodiments of the present invention relate to the field of circuit technology, and disclose a method for correcting a SOC of a battery pack, a battery management system, and a vehicle. The method for correcting an SOC of a battery includes: determining, when a charging process of the battery pack starts, whether an initial SOC value of the battery pack is less than or equal to a preset electricity quantity threshold; when the initial SOC value of the battery pack is less than or equal to the preset electricity quantity threshold, recording state information of the battery pack during the charging process, and generating a differential capacity curve of the battery pack according to the state information; correcting a current SOC value of the battery pack according to the differential capacity curve and a voltage-SOC reference curve of a non-decay zone of the battery pack.

Abstract: Embodiments of this application provide an energy storage device and system as well as a power system, and relate to the technical field of a power grid. The energy storage device includes: at least two parallel-connected energy storage units, where each energy storage unit includes: a battery cluster and a power conversion system; and the battery cluster includes at least two cells; a direct-current side of the power conversion system is electrically connected to the battery cluster, an alternating-current side of the power conversion system is configured to electrically connect to an input side of an alternating-current combiner cabinet, and an output side of the alternating-current combiner cabinet is configured to electrically connect to an alternating-current side of a transformer. The energy storage device is configured to improve safety and reliability of the energy storage system.

Abstract: Provided is a method and an apparatus for determining a state of charge of a battery, a battery management system and a storage medium, and relates to the field of battery technologies, where the method includes: obtaining a current OCV value of a battery and cumulative continuous charging or discharging capacity information of the battery; obtaining SOC credible information based on the current OCV value and the cumulative continuous charging or discharging capacity information; obtaining a corrected SOC value corresponding to the current OCV value according to the SOC credible information. According to the present disclosure, accuracy of SOC correction could be improved by determining the SOC credible information under the current OCV; for batteries, especially those with a hysteresis characteristic, accuracy of SOC estimation could be improved, an error of SOC estimation could be reduced and reliability of battery and experience of users could be improved.

Abstract: An automatically tray feeding device includes: at least one conveying mechanism configured to convey a tray at different heights; at least one lifting mechanism configured to move the tray on a conveying mechanism at a first height to a conveying mechanism at a second height different from the first height; and a sorting table frame configured to carry the at least one conveying mechanism and the at least one lifting mechanism.

Abstract: A tray disinfection devices for a security inspection system can include a frame, a disinfection channel on the frame, and a conveyor on the frame. An ultraviolet disinfection lamp is arranged in the disinfection channel. The conveyor on the frame is configured to convey a tray to pass through the disinfection channel so as to disinfect the tray through an irradiation of the ultraviolet disinfection lamp.

Abstract: Embodiments of this application provide a fire-fighting switch device and a fire-fighting system, which are applied to the field of fire-fighting. The fire-fighting switch device includes a plurality of fire detection switch units, where the fire detection switch unit includes one or more fire detection switches, the one or more fire detection switches form at least one switch path, the fire detection switch is configured to turn on when a fire is detected, and any one of the switch paths is configured to transmit a voltage signal to a fire-extinguishing device when all of the fire detection switches on the switch path are turned on. In this solution, when a fire is detected by one fire detection switch unit, the fire-extinguishing device can be controlled to extinguish the fire provided that all fire detection switches on one switch path in the fire detection switch unit are turned on.