Energy storage device and its charge / discharge control system

Abstract

The present application provides an energy storage device and a charge / discharge control system thereof, the energy storage device including: an energy storage power source; and a battery pack detachably connected to the energy storage power source. The energy storage power source includes: a housing in which an attachment portion including an interface is disposed; a built-in battery and an inverter, each of which is disposed within the housing and does not interfere with the attachment portion; and an input interface and an output interface, each of which is disposed on the housing and can be contacted and used by a user. The battery pack includes a power output port detachably connected to the attachment portion and mechanically and electrically connectable to the interface. When the battery pack is disposed in the energy storage power source, the battery pack has at least two different working states. In a first working state, the battery pack is charged by power from one end of the energy storage power source through the mechanical and electrical connection between the power output port and the interface. In a second working state, the battery pack is coupled to the built-in battery and the inverter, each of which is coupled to the built-in battery and the inverter, each of which is coupled to the power output port and the interface, and further outputs AC current through the output interface.

Description

[Technical field]

[0001] The present application relates to the field of energy storage, and in particular to an energy storage device and its charge / discharge control system. [Background technology]

[0002] The energy storage device can be used as an outdoor power source or an emergency power source. A device that requires electricity is connected to the energy storage device, and the energy storage device may supply power to an electricity-using device. When the amount of electricity in the energy storage device is insufficient or depleted, the energy storage device may be connected to an external power source for charging.

[0003] The energy storage device includes a battery pack, and the battery pack can be charged and discharged. The energy storage device further includes a current converter, and the current converter converts a current flowing into the battery pack and a current flowing out of the battery pack into a current capable of charging the battery pack and a current capable of being supplied to an electricity-using device.

[0004] The power of an energy storage device is generally determined by the power of a battery pack installed inside, and the upper limit of its discharge power is limited by the power of the battery pack. Energy storage devices are always classified according to different powers when shipped, and consumers generally select and purchase an energy storage device with a certain power according to their needs. After purchase, the maximum power of the energy storage device is limited, and when the electricity usage demand of the electricity usage device exceeds the maximum power of the energy storage device, the energy storage device cannot effectively meet the electricity usage demand, which affects the consumer's usage experience. Summary of the Invention [Problem to be solved by the invention]

[0005] One object of the present application is to provide an energy storage device and its charge / discharge control system that can expand the capacity to meet higher electricity usage demands.

[0006] Another object of the present application is to provide an energy storage device and a charge / discharge control system thereof, in which an internal battery included in the energy storage device can be connected to a battery pack to realize capacity expansion, and when the internal battery and the battery pack are conductively connected, the capacity of the energy storage device can be expanded to supply power to a larger load.

[0007] Another object of the present application is to provide an energy storage device and its charge / discharge control system that can select an appropriate charging method to charge the built-in battery and the battery pack according to the actual conditions of the built-in battery and the battery pack.

[0008] Another object of the present application is to provide an energy storage device and a charge / discharge control system thereof, which, when charging the energy storage device, charges a connected battery pack preferentially, thereby completing charging of the battery pack as quickly as possible so that the battery pack can be used by a user, and then charges the built-in battery.

[0009] Another object of the present application is to provide an energy storage device and its charge / discharge control system that can supply power to a load by utilizing an external power source while charging an internal battery, and thereby switch the internal battery from a charged state to a discharged state to supply power to the load when power supply from the external power source is stopped or interrupted.

[0010] Another object of the present application is to provide an energy storage device and its charge / discharge control system, in which an internal battery and a battery pack are connected in parallel, and after the internal battery is discharged, the battery pack continues to discharge, thereby extending the discharge time of the energy storage device.

[0011] Another object of the present application is to provide an energy storage device and its charge / discharge control system in which an internal battery has a low-voltage protection mechanism, and after the internal battery is discharged and enters a low-voltage protection state, a discharge unit is switched so that the battery pack continues to discharge.

[0012] Another object of the present application is to provide an energy storage device and its charge / discharge control system, which can ensure the use of the energy storage device in an emergency by charging the built-in battery in reverse direction using a battery pack.

[0013] Another object of the present application is to provide an energy storage device and a charge / discharge control system thereof, which can ensure the electrical demand of a load connected to the energy storage device by discharging the energy storage device in a reverse direction using a battery pack.

[0014] Another object of the present application is to provide an energy storage device and a charge / discharge control system thereof, the energy storage device including a transmitter, an internal battery being circuit-connected to the transmitter, and the transmitter converting and processing the current flowing into the internal battery and the current flowing out of the internal battery, thereby satisfying various electricity usage demands.

[0015] Another object of the present application is to provide an energy storage device and a charging / discharging control system thereof, in which a transmitter includes an input interface, and the input interface is capable of being connected to an external power source to obtain current, so that the energy storage device can be disconnected from the external power source and used independently by storing power.

[0016] Another object of the present application is to provide an energy storage device and a charge / discharge control system thereof, in which a power transmitter includes an inverter capable of rectifying AC current to DC current, inversely converting DC current to AC current, and converting DC current to DC current, so that the energy storage device can meet various electricity usage demands.

[0017] Another object of the present application is to provide an energy storage device and its charge / discharge control system, in which the transmitter further includes an output interface that can output AC current and DC current to meet different electricity usage demands. [Means for solving the problem]

[0018] According to one aspect of the present application, an energy storage device according to the present application includes an energy storage power source and a battery pack removably connected to the energy storage power source, The energy storage power source includes: A housing in which an attachment portion including an interface is disposed, and a built-in battery and an inverter that are respectively provided within the housing and do not interfere with the attachment portion; an input interface and an output interface, each of which is provided on the housing and can be used by a user to contact the input interface and the output interface, the battery pack is detachably connected to the mounting portion and includes a power output port mechanically and electrically connectable to the interface; the battery pack has at least two different operating states when disposed in the energy storage power source; In the first working state, the battery pack is charged by power from one end of the energy storage power source via a mechanical and electrical connection between the power output port and the interface; In the second working state, The battery pack is coupled to the built-in battery and the inverter respectively through mechanical and electrical connections between the power output port and the interface, and further outputs AC current through the output interface.

[0019] In one embodiment of the present application, the battery pack includes at least two charging methods, In a charging method 1, when an external power source for charging is connected to the input interface, the battery pack receives power from the external power source for charging through a mechanical and electrical connection between the power output port and the interface; In charging method 2, when an external power source for charging is not connected to the input interface, the battery pack receives power from the built-in battery for charging through the mechanical and electrical connection between the power output port and the interface.

[0020] In one example of the present application, when an external power source for charging is connected to the input interface, one of the battery pack and the built-in battery receives power preferentially and is charged, and when charging of one of the battery pack and the built-in battery is completed, the other of the battery pack and the built-in battery receives power and is charged.

[0021] In one example embodiment of the present application, the energy storage device comprises: The battery pack further includes a control key configured to select and control whether the battery pack is coupled to the inverter.

[0022] In one example of the present application, when the control key controls the battery pack so that it is not coupled to the inverter, the built-in battery charges the battery pack and simultaneously outputs power to the battery pack and the inverter so that the inverter outputs AC current.

[0023] In one example of the present application, when the control key controls the battery pack to be coupled to the inverter, the battery pack outputs power to the inverter such that the inverter outputs an AC current.

[0024] In one example of the present application, when the battery pack and the built-in battery are each coupled to the inverter, the built-in battery preferentially outputs power to the inverter so that the inverter outputs AC current, and when the voltage of the built-in battery drops to a low voltage protection threshold, the battery pack switches the power source from the built-in battery to the battery pack so that the inverter outputs power to the inverter so that the inverter outputs AC current.

[0025] According to one aspect of the present application, an energy storage device according to the present application comprises: An energy storage power source including an internal battery, a power transmitter, a housing to which the internal battery and the power transmitter are attached, and a battery pack; The power transmitter is connected to an external power source and supplies power to the energy storage device, the built-in battery is circuit-connected to the power transmitter and is charged and discharged by the power transmitter, and the power transmitter is connected to a load and supplies power to the load; The battery pack is removably attached to the housing and in circuit connection with the power transmitter and is charged by the energy storage power source, and when both the internal battery and the battery pack need to be charged, the battery pack is charged preferentially over the internal battery.

[0026] In one example of the present application, when the power transmitter is connected to an external power source, the energy storage device is in a charging state, and it is detected that both the built-in battery and the battery pack need to be charged, the power transmitter preferentially converts the power of the external power source to a second charging current, and after completing charging of the battery pack, converts the power of the external power source to a first charging current to charge the built-in battery.

[0027] In one example of the present application, when two or more battery packs need to be charged, the charging of the two or more battery packs is completed in sequence according to a charging order from the battery pack with the lower amount of electricity to the battery pack with the higher amount of electricity.

[0028] In one example of the present application, when two or more battery packs need to be charged, the charging of the two or more battery packs is completed in sequence according to a charging order from the battery pack with the highest electrical charge to the battery pack with the lowest electrical charge.

[0029] In one embodiment of the present application, if more than one battery pack needs to be charged, all the battery packs are charged simultaneously until each battery pack is fully charged.

[0030] In one embodiment of the present application, if more than one battery pack needs to be charged, all the battery packs are charged alternately until each battery pack is fully charged.

[0031] In one example of the present application, when the power transmitter is not connected to an external power source and the energy storage device is in a non-charging state, the built-in battery provides a discharge current to power a connected load, the battery pack is connected to a circuit of the energy storage device, and the built-in battery and the battery pack are connected in parallel to power the load.

[0032] In one example of the present application, a parallel control key is provided in the energy storage device, the battery packs are circuit-connected to the power transmitter and to the parallel control key, and the parallel control key is operated to control the corresponding battery pack to be connected in parallel to the built-in battery.

[0033] In one example of the present application, after the battery pack and the built-in battery are connected in parallel, the built-in battery first releases current, which is converted into a discharge current by the power transmitter and then supplied to a load, and the discharge target is switched from the built-in battery to the battery pack so that the battery pack continues to discharge until the discharge of the built-in battery is complete, and the current is converted into the discharge current by the power transmitter and continues to supply power to the load, thereby extending the discharge time of the energy storage device.

[0034] In one example of the present application, when the internal battery is discharged until the voltage becomes zero, the discharge target is switched from the internal battery to the battery pack so that the discharge of the internal battery is completed and the battery pack begins to discharge.

[0035] In one example of the present application, when the built-in battery discharges until the voltage falls below a first low voltage threshold, the discharge of the built-in battery is completed, a low voltage protection state is entered, and the discharge target is switched from the built-in battery to the battery pack so that the battery pack discharges.

[0036] In one example of the present application, after the battery pack and the built-in battery are connected in parallel, the one of the battery pack and the built-in battery, which has the higher voltage, discharges first, the battery pack and the built-in battery reach a voltage equalization state, and both the battery pack and the built-in battery discharge. The discharge current is converted by the power transmitter and supplied to a load.

[0037] In one example of the present application, the battery pack and the built-in battery are connected in parallel and then discharged together, which is converted into a discharge current by the power transmitter and supplied to a load; after the battery pack discharges below a second low voltage threshold, it stops discharging and enters a low voltage protection state; and after the built-in battery discharges below the first low voltage threshold, it stops discharging and enters a low voltage protection state.

[0038] In one example of the present application, a charge / discharge control system for controlling charging and discharging of an energy storage device according to the present application includes: a detection unit connected to the circuit of the energy storage device to detect electrical information of each device connected to the circuit, to detect whether the energy storage device is connected to a battery pack, and to detect electrical information of the battery pack; an identification unit communicatively connected to the detection unit, for identifying a power source and an electrical usage demand of the energy storage device based on electrical information detected by the detection unit; a comparison unit communicatively connected to the identification unit, for comparing the power supply source and the electricity usage demand, and generating a corresponding charge control command and / or discharge control command, wherein when the electricity usage demand is to charge the built-in battery of the energy storage device and the connected battery pack, the charge control command generated by the comparison unit is to charge the battery pack preferentially, and charge the built-in battery after completing charging of the battery pack; a charging unit circuit-connected to the comparison unit for executing the charging control command;

[0039] In one example of the present application, the charging control instructions generated by the comparison unit further include instructions to charge two or more of the battery packs connected to the energy storage device according to a preset battery pack charging priority.

[0040] In one example of the present application, the detection unit detects that the power transmitter is connected to a load, the identification unit identifies that the electricity usage demand is power supply to the load, and the comparison unit compares the electricity usage demand based on the power supply source identified by the identification unit and generates a discharge control command, and the charge / discharge control system: The device further includes a discharge unit communicatively connected to the comparison unit to execute the discharge control instructions to control the energy storage device to output a discharge current to power a load.

[0041] In one example of the present application, when the detection unit detects that the battery pack is connected to a load and the identification unit identifies that a power supply is capable of supplying power to the built-in battery and the battery pack, the discharge control command generated by the comparison unit is a command to connect the built-in battery and the battery pack in parallel, output a discharge current in parallel, and supply power to the load.

[0042] In one embodiment of the present application, the detection unit detects that the battery pack is connected to the energy storage device, i.e., is identified as a power supply by the identification unit, and can be connected in parallel with the built-in battery.

[0043] In one example of the present application, when the detection unit detects that a parallel control key of the energy storage device is triggered, and the identification unit identifies that the battery pack controlled by the parallel control key is the power supply, it can be connected in parallel with the built-in battery.

[0044] In one example of the present application, the discharge control command further includes a parallel output method of the battery pack and the built-in battery, and the parallel output method is to switch the discharge unit so that the built-in battery discharges first, and after the discharge of the built-in battery is completed, the parallel-connected battery pack discharges.

[0045] In one embodiment of the present application, when the detection unit detects that the internal battery is discharging to zero voltage, the discharge unit is switched so that the internal battery is discharged to completion and the battery pack is discharged.

[0046] In one example of the present application, when the detection unit detects that the built-in battery is discharging until the voltage is lower than a first low voltage threshold, the discharge of the built-in battery is completed and the discharge unit is switched to discharge the battery pack.

[0047] In one example of the present application, when the detection unit detects that the voltage of the battery pack is lower than a second low-voltage threshold, the discharging unit stops discharging the battery pack.

[0048] In one example of the present application, the discharge control command further includes a parallel output method of the battery pack and the built-in battery, and the parallel output method is such that either the built-in battery or the battery pack, whichever has a higher voltage, is discharged first, and after the voltages of the built-in battery and the battery pack are equalized, both the built-in battery and the battery pack are discharged.

[0049] In one example of the present application, when the identification unit identifies two or more of the battery packs as the power supply sources, they can be connected in parallel with the built-in battery, and the discharge control command generated by the comparison unit further includes a command to control the discharge of two or more battery packs according to a preset battery pack discharge sequence after switching the discharge unit so that the battery packs discharge.

[0050] In one example of the present application, the discharge sequence of the battery packs is preset so as to sequentially control each of the battery packs connected in parallel to be discharged according to a discharge sequence from high voltage to low voltage.

[0051] In one example of the present application, the discharge sequence of the battery packs is preset so as to sequentially control each of the battery packs connected in parallel to be discharged according to a discharge sequence from low voltage to high voltage.

[0052] In one example of the present application, the discharge order of the battery packs is preset so that the battery pack with the higher voltage discharges first, then the voltages of the battery packs with the lower voltages are equalized and then discharged together, and after the voltages of the battery packs connected in parallel are equalized, they are discharged together.

[0053] According to another aspect of the present application, the present application provides a charge / discharge control method for controlling charge / discharge of an energy storage device, comprising: connecting the battery pack in circuit with an energy storage device; When it is detected that a built-in battery of an energy storage device and the battery pack need to be charged simultaneously, charging the battery pack with priority, and charging the built-in battery after charging of the battery pack is completed.

[0054] In one embodiment of the present application, two or more battery packs are charged according to a preset battery pack charging priority.

[0055] In one example of the present application, the charge / discharge control method includes: detecting a load connected to the energy storage device and requesting power consumption; identifying the built-in battery as a power supply source and supplying power to a load; detecting that the battery pack is connected to a circuit of the energy storage device and identifying the battery pack as a power source; and connecting the battery pack and the internal battery in parallel to output discharge current in parallel to supply power to a load.

[0056] In one example of the present application, the charge / discharge control method includes: The method includes the step of detecting that the battery pack is connected to a circuit of the energy storage device when the battery pack is connected to a load, i.e., identifying the battery pack as a power supply.

[0057] In one example of the present application, the charge / discharge control method includes: A parallel control key is operated to control the corresponding battery pack and the internal battery so as to be connected in parallel. Effect of the Invention

[0058] Compared with the prior art, the present application has at least the following advantages, but is not limited to:

[0059] The battery pack is removably attached to the energy storage power source, so that the battery pack can be charged by the energy storage power source and power can be replenished in a timely manner, and the energy storage device re-provides a usable battery pack for a load that is compatible with the battery pack, thereby enabling the load that is compatible with the battery pack to be continuously used; The battery pack is discharged by the energy storage power source, expanding the capacity of the energy storage power source simply and conveniently; The battery pack is selectively coupled to the energy storage power source for outputting power to an inverter of the energy storage power source for outputting AC current by the inverter.

[0060] Set the charging sequence of the battery pack and the built-in battery to meet the actual usage demand, for example, the battery pack is charged first before the built-in battery, and the power of the battery pack is replenished promptly and in a timely manner to ensure the normal use of the battery pack; The battery pack and the internal battery are connected in parallel to supply power to a load connected to the energy storage device, thereby extending the discharge time of the energy storage device or improving the discharge power of the energy storage device.

[0061] Further objects and advantages of the present application will become apparent from the following description and accompanying drawings. [Brief description of the drawings]

[0062] [Figure 1A] FIG. 2 is a schematic diagram of the state of an energy storage device according to a preferred embodiment of the present application. [Figure 1B] FIG. 2 is a schematic diagram of the state of an energy storage device according to a preferred embodiment of the present application. [Figure 1C] FIG. 2 is a schematic diagram of an energy storage device according to a preferred embodiment of the present application from another angle. [Figure 1D] 1 is a schematic diagram showing the internal configuration of an energy storage device according to a preferred embodiment of the present application; [Diagram 2] FIG. 1 is a block diagram of an energy storage device according to a preferred embodiment of the present application. [Figure 3A] FIG. 2 is a schematic diagram of an operation mode of an energy storage device according to a preferred embodiment of the present application in a charging mode. [Figure 3B] FIG. 2 is a schematic diagram of an operation mode of an energy storage device according to a preferred embodiment of the present application in a charging mode. [Figure 3C] FIG. 2 is a schematic diagram of an operation mode of an energy storage device according to a preferred embodiment of the present application in a charging mode. [Figure 4A] FIG. 2 is a schematic diagram of an operation mode of an energy storage device according to a preferred embodiment of the present application in a multi-function mode. [Figure 4B] FIG. 2 is a schematic diagram of an operation mode of an energy storage device according to a preferred embodiment of the present application in a multi-function mode. [Figure 5A] FIG. 2 is a schematic diagram of an operation mode of an energy storage device according to a preferred embodiment of the present application in a power supply mode. [Figure 5B] FIG. 2 is a schematic diagram of an operation mode of an energy storage device according to a preferred embodiment of the present application in a power supply mode. [Figure 6] 1 is a schematic diagram of a charge / discharge control system according to a preferred embodiment of the present application; [Figure 7] FIG. 2 is a schematic diagram of an energy storage device according to another preferred embodiment of the present application. [Figure 8] FIG. 2 is a schematic diagram of an energy storage device according to another preferred embodiment of the present application. [Figure 9] FIG. 2 is a schematic diagram of a method for charging an energy storage device according to a preferred embodiment of the present application. [Figure 10] FIG. 2 is a schematic diagram of a method for discharging an energy storage device according to a preferred embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0063] The following description is provided to disclose the present application and to enable those skilled in the art to practice the present application. The preferred embodiments in the following description are given by way of example only, and other obvious variations may occur to those skilled in the art. The basic principles of the present application defined in the following description may be applied to other embodiments, modifications, improvements, equivalents, and other technical means without departing from the spirit and scope of the present application.

[0064] It should be understood by those skilled in the art that in the present disclosure, the directions or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings and are merely for the purpose of facilitating and simplifying the description of the present application, and do not indicate or suggest that the devices or parts shown must have a particular orientation or be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

[0065] [Energy storage power source] As shown in Figs. 1A to 6, the energy storage power supply according to the present application includes an internal battery 10 and a power transmitter 20, and the internal battery 10 is connected to the power transmitter 20 in a circuit. Current is transmitted between the internal battery 10 and the power transmitter 20. The energy storage power supply further includes a housing 30, and the internal battery 10 and the power transmitter 20 are provided in the housing 30. The internal battery 10 is connected to the power transmitter 20 in a circuit, and the internal battery 10 transmits a current to the power transmitter 20, and the power transmitter 20 may convert the current transmitted by the internal battery 10 and then output the converted current to a load connected to the circuit, thereby supplying power to the load. The power transmitter 20 also acquires a current, converts it into a current capable of charging the internal battery 10, and transmits the current to the internal battery 10. That is, the internal battery 10 may be discharged by the power transmitter 20, or may be charged by the power transmitter 20.

[0066] 1A to 1D, the power transmitter 20 includes an input interface 21, an inverter 22, and an output interface 23. The input interface 21 and the output interface 23 are each provided in a housing 30 and can be used by a user by contacting them. The inverter 22 is provided within the housing 30.

[0067] The input interface 21 is connected to an external power source to acquire power. The inverter 22 is circuit-connected to the input interface 21 to convert the current input from the input interface 21. The output interface 23 is circuit-connected to the inverter 22 to output the current transmitted from the inverter 22. The output interface 23 outputs a current to the outside of the energy storage power source. A load is connected to the output interface 23, and the output interface 23 transmits a current to the load. The internal battery 10 is circuit-connected to the inverter 22 to acquire a current and be charged, or is discharged by the inverter 22, which is a current conversion unit, and output by the output interface 23.

[0068] When charging the internal battery 10, the input interface 21 obtains power from an external power source, the inverter 22 converts the power into a first charging current, and the first charging current is transmitted to the internal battery 10 to charge it.

[0069] After storing power, the built-in battery 10 can serve as a power source for the energy storage power source and supply power to a load connected to the energy storage power source. The built-in battery 10 discharges power to supply power to the load. In response to the electricity usage demand of the load, the inverter 22 performs a corresponding current conversion on the first discharge current, converts the first discharge current into a discharge current that matches the electricity usage demand of the load, and transmits the discharge current to the load.

[0070] Current conversion includes AC current to DC current rectification, DC current to AC current inverse conversion, and DC current to DC current conversion, and may include current conversion processing functions that perform bidirectional AC current to DC current conversion, DC current to DC current conversion, or bidirectional inverse conversion.

[0071] The input interface 21 may be connected to an external power source, such as a utility power source, a solar energy device, other energy storage sources, etc. The input interface 21 may obtain an AC current or a DC current.

[0072] The energy storage power source may discharge to a load connected to the energy storage power source. The load is conductively connected to the output interface 23, which outputs a current to the load. The current output by the output interface 23 may be from the power of an external power source obtained from the input interface, or from the built-in battery 10 and the battery pack 40. The built-in battery 10 may supply power to the load alone, or the built-in battery 10 and the battery pack 40 may be connected in parallel and then supplied with power to the load.

[0073] After the load and the energy storage power supply have successfully identified each other, it is determined that the load and the energy storage power supply are connectable, and the load and the energy storage power supply are conductively connected. Alternatively, after the load is turned on by the physical switch, the load and the energy storage power supply have successfully identified each other, and the load and the energy storage power supply are conductively connected. That is, the load is identified as an object that can be supplied with power from the energy storage power supply and is conductively connected to the energy storage power supply, so that the energy storage power supply can discharge to the load. As can be understood, the energy storage power supply and the load can be identified by providing a physical switch to the energy storage power supply and turning on the energy storage power supply.

[0074] The output interface 23 outputs a discharge current, and further, the output interface 23 is provided with an output interface. The output interface may include an AC output interface, may include a DC output interface, or may include an ignition nozzle. The AC output interface may be connected to an AC load, and the DC output interface may be connected to a DC load. That is, the output interface 23 may output an AC discharge current, or may output a DC discharge current. The load may include an AC electricity-using device and a DC electricity-using device, and the AC discharge current and the DC discharge current are obtained by an energy storage power source.

[0075] [Energy storage device and battery pack 40] The energy storage device includes the above-mentioned energy storage power source and a battery pack 40, and the number of the battery packs 40 may be one, two, or more than two. The battery pack 40 is removably attached to the housing 30. When the battery pack 40 is attached to the housing 40, the battery pack 40 is circuit-connected to the circuit of the energy storage device.

[0076] The battery pack 40 may be connected to an energy storage power source to be charged by the energy storage power source, and may be discharged by the energy storage power source as a power source to expand the capacity of the energy storage power source and extend the discharge time of the energy storage power source. The connection between the battery pack 40 and the energy storage power source may be a cordless coupling connection, a wireless connection, and / or a cord connection.

[0077] Preferably, the battery pack 40 is coupled to the energy storage power source in a cordless manner. In some examples, the housing 30 is provided with an interface for circuit connection to the battery pack 40. Preferably, the interface is implemented as an interface suitable for cordless coupling, as a wireless charging interface, and as a corded interface. Preferably, the interface is implemented as a cordless coupling interface, whereby the battery pack 40 is circuit connected to the circuit of the energy storage power source by cordless coupling.

[0078] Preferably, the battery pack 40 is at least partially or entirely contained within the housing 30. Preferably, the battery pack 40 is provided outside the housing 30, for example, on an upper portion of the housing 30. Preferably, the battery pack 40 is provided on the outer circumferential surface of the housing 30.

[0079] The battery pack 40 is further provided with a power transmission interface, which outputs the power stored in the battery pack 40 to the outside and can generally transmit a DC current. Preferably, when the battery pack 40 is connected to an energy storage power source, the power transmission interface is at least partially shielded and in a disabled state. Preferably, when the battery pack 40 is connected to an energy storage power source, the power transmission interface is disabled.

[0080] The battery pack 40 can independently drain current to power a load that can draw power from the battery pack 40. If the battery pack 40 is removed from the matched load and attached to an energy storage power source for charging, another battery pack 40 may be swapped in from the energy storage device to continue powering the matched load.

[0081] Preferably, the battery pack 40 is inserted into an energy storage power source and is conductively connected to the energy storage power source. Furthermore, the battery pack 40 and the internal battery 10 are conductively connected, and / or the battery pack 40 and the power transmitter 20 are conductively connected.

[0082] The mounting portion is disposed on the housing of the energy storage power source, and the internal battery 10 and the inverter 22 are respectively provided within the housing and do not interfere with the mounting portion. The mounting portion includes an interface that does not interfere with the internal battery 10 and the inverter 22.

[0083] The battery pack 40 is detachably connected to the mounting portion. The battery pack 40 includes a power output port that is mechanically and electrically connectable to the interface. That is, the battery pack 40 is mechanically and electrically connected to the energy storage power source through the connection between the power output port and the interface.

[0084] In an example of mounting one battery pack 40 and an energy storage power source, the housing 30 is provided with at least one receiving cavity 301 in which the battery pack 40 can be mounted. An interface is provided in the receiving cavity 301, the interface is connected to the battery pack 40, and is conductively connected to the battery pack 40 to transmit current between the battery pack 40 and the energy storage power source. Furthermore, the interface is connected to a circuit of the energy storage power source, and the battery pack 40 is connected to the circuit of the energy storage power source through the interface, and is conductively connected to the circuit of the energy storage power source. A power output port is provided in the battery pack 40, and the power output port is conductively connected to the interface. The battery pack 40 may obtain power from the energy storage power source through the power output port so as to be charged by the energy storage power source, and may be discharged to the energy storage power source, and may serve as a capacity expansion device of the energy storage power source to expand the capacity of the energy storage power source and extend the discharge time of the energy storage power source.

[0085] Preferably, the receiving cavity 301 receives the battery pack 40 such that the battery pack 40 is received within the housing 30 .

[0086] The housing 30 has an outer surface 302, and a receiving cavity 301 is formed extending inwardly from a portion of the outer surface 302.

[0087] Preferably, the accommodating cavity 301 is provided near the internal battery 10 and is adjacent to the internal battery 10, with the opening of the accommodating cavity 301 located on the surface of the housing 30. The accommodating cavity 301 is sized to accommodate the battery pack 40. Preferably, the battery pack 40 has an outer peripheral surface 41, and after the battery pack 40 is accommodated in the accommodating cavity 301, at least a portion of the outer peripheral surface 41 of the battery pack 40 is shielded by the accommodating cavity 301.

[0088] In addition, preferably, the battery pack 40 and the energy storage power source identify each other, for example, by performing a handshake communication, and after performing the handshake communication, the battery pack 40 is circuit-connected to the circuit of the energy storage power source.

[0089] The battery pack 40 may be charged by the energy storage power source after being connected to the energy storage power source. The battery pack 40 is connected to the circuit of the energy storage power source by a charging sub-circuit. The energy storage power source delivers a second charging current to the battery pack 40 by the charging sub-circuit.

[0090] When the battery pack 40 is disposed in the energy storage power source, it has at least two different working states: in the first working state, the battery pack 40 is charged by power from one end of the energy storage power source through the mechanical and electrical connection between the power output port and the interface, and in the second working state, the battery pack 40 is coupled to the built-in battery and the inverter 22 respectively through the mechanical and electrical connection between the power output port and the interface, and further outputs AC current through the output interface 23.

[0091] In the first working state, the battery pack 40 is charged by the energy storage power source, and in the second working state, the battery pack 40 is discharged and outputs a current by the energy storage power source. In particular, the energy storage power source may have an inverter 22 to convert the DC current output from the battery pack 40 into an AC current, and output the AC current through the output interface 23.

[0092] In the first working state, the battery pack 40 includes at least two charging methods. In charging method 1, when an external power source for charging is connected to the input interface 21, the battery pack 40 receives power from the external power source for charging through the mechanical and electrical connection between the power output port and the interface, and in charging method 2, when an external power source for charging is not connected to the input interface 21, the battery pack 40 receives power from the built-in battery 10 for charging through the mechanical and electrical connection between the power output port and the interface.

[0093] When an external power source for charging is connected to the input interface 21, either the battery pack 40 or the built-in battery 10 receives power preferentially and is charged, and when charging is completed, the other receives power and is charged.

[0094] The battery pack 40 may be selectably coupled to the inverter 22 to enter the second working state. The energy storage device further includes a control key configured to select and control whether the battery pack is coupled to the inverter 22.

[0095] When the control key controls the battery pack 40 so that it is not coupled to the inverter 22, the internal battery 10 charges the battery pack 40 and simultaneously outputs power to the battery pack 40 and the inverter 22 so that the inverter 22 outputs AC current.

[0096] When the control key controls the battery pack 40 to be coupled to the inverter 22, the battery pack 40 outputs power to the inverter 22 such that the inverter 22 outputs an AC current.

[0097] When the battery pack 40 and the internal battery 10 are each connected to the inverter 22, the internal battery 10 preferentially outputs power to the inverter 22 so that the inverter outputs AC current, and when the voltage of the internal battery 10 drops to the low voltage protection threshold, the battery pack 40 switches the power source from the internal battery 10 to the battery pack 40 so that the battery pack 40 outputs power to the inverter so that the inverter outputs AC current.

[0098] Specifically, the battery pack 40 and the internal battery 10 are coupled to the inverter 22 because they have the same rated voltage.

[0099] [Energy storage device operating mode] In one aspect of the present application, the energy storage device has multiple operating modes, including but not limited to a charging mode, a power supply mode, and a multi-function mode, etc. The energy storage device determines which operating mode to operate in depending on the electrical usage demand.

[0100] When the energy storage device operates in a charging mode and charges the built-in battery 10 and / or the battery pack 40, the energy storage device discharges a charging current only to the built-in battery 10 and / or the battery pack 40; when the energy storage device operates in a power supply mode and supplies power to a connected load, the energy storage device discharges a discharging current only to the connected load; when the energy storage device operates in a multi-function mode, the energy storage device may charge the built-in battery 10 and / or the battery pack 40 and supply power to a connected load, i.e., the energy storage device may simultaneously charge and supply power and discharge a charging current and a discharging current.

[0101] Specifically, when the energy storage device operates in a charging mode, it may charge the internal battery 10, the battery pack 40, and / or the internal battery 10 and the battery pack 4 according to the actual situation. When the power of the internal battery 10 is insufficient, it may transmit a first charging current to the internal battery 10 to charge the internal battery 10, when the battery pack 40 is connected to the circuit of the energy storage power source and requires charging, it may transmit a second charging current to the battery pack 40 to charge the battery pack 40, when the power of the internal battery 10 is insufficient and the battery pack 40 requires charging, it charges the internal battery 10 and the battery pack 40.

[0102] When the energy storage device operates in the power supply mode, the energy storage device may discharge a corresponding discharge current according to the electricity usage demand of the connected load to power the load, i.e., when the electricity usage demand is to power the load, the energy storage device operates in the power supply mode.

[0103] When operating in the multi-function mode, the energy storage device may simultaneously emit a charging current and a discharging current to respectively charge the internal battery 10 and / or the battery pack 40 and power a load.

[0104] When it is detected that the battery pack 40 is connected to the energy storage device and requires charging, the energy storage device operates in a charging mode, and when it is further detected that a load is connected to the energy storage device and requires power supply, the energy storage device is switched to operate in a multi-function mode. When only a load is connected to the energy storage device and requires power supply, the energy storage device is switched to operate in a power supply mode.

[0105] [Energy storage device charge state] In another aspect of the present application, the power source of the charging current and / or discharging current in different operation modes is determined based on different states of the energy storage device. Based on whether the energy storage device is connected to an external power source, the energy storage device is defined as having a charging state and a non-charging state. When the energy storage device is connected to an external power source and obtains power from the external power source, the energy storage device is in a charging state, and when the energy storage device is not connected to an external power source and does not obtain power from outside the energy storage device, the energy storage device is in a non-charging state.

[0106] Specifically, when the energy storage device is in a charging state, the charging current and / or discharging current may be preferably from an external power source, more preferably from the built-in battery 10 and / or the battery pack 40. In this case, the energy storage device may operate in a charging mode, a power supply mode, and / or a multi-function mode. When the energy storage device is in a charging state, the external power source is preferentially used and converted into a first charging current, a second charging current, and / or a discharging current to power the built-in battery 10, the battery pack 40, and / or the load.

[0107] When the energy storage device is in a non-charging state and not obtaining power from an external power source, a charging current and / or a discharging current may be selected from the internal battery 10 and / or the battery pack 40. In this case, the energy storage device may operate in a charging mode, a power supply mode and / or a multi-function mode. The internal battery 10 may discharge and convert to a second charging current and / or a discharging current to charge the battery pack 40 and / or to power a load.

[0108] The battery pack 40 may be discharged and converted into a discharge current to supply power to a load. The battery pack 40 may be discharged by an energy storage device, and discharged in parallel with the internal battery 10 as a power source for the discharge current of the energy storage device, thereby extending the discharge time of the energy storage device and / or improving the discharge power of the energy storage device.

[0109] [Embodiment of charging] First, a scene in which the battery pack 40 is in a first working state after being placed in the energy storage power source, i.e., an embodiment in which the battery pack 40 is charged by power from one end of the energy storage power source through the mechanical and electrical connection between the power output port and the interface, will be described.

[0110] As shown in Figures 3A to 3C, an embodiment will be described in which the energy storage device charges the internal battery 10 and the battery pack 40. When only the internal battery 10 needs to be charged, the internal battery 10 is charged. When both the internal battery 10 and the battery pack 40 need to be charged, charging is performed according to a preset charging priority order for the internal battery 10 and the battery pack 40.

[0111] In a preferred embodiment of the present application, the charging priority of the internal battery 10 and the battery pack 40 is that the battery pack 40 is charged prior to the internal battery 10. When the battery pack 40 is connected to the circuit of the energy storage device and requests charging, the battery pack 40 is charged, and when it is necessary to charge both the internal battery 10 and the battery pack 40, the battery pack 40 is charged preferentially. After charging of the battery pack 40 is completed, the internal battery 10 is charged.

[0112] Specifically, it detects whether the internal battery 10 needs charging, and detects whether the battery pack 40 requires charging. If it detects that the internal battery 10 needs charging and the battery pack 40 requires charging, it preferentially discharges the second charging current to the battery pack 40. It detects whether charging of the battery pack 40 is complete. When charging of the battery pack 40 is complete, it stops discharging the second charging current and discharges the first charging current to the internal battery 10, charging the internal battery 10.

[0113] In one embodiment of detecting whether to charge the internal battery 10 and the battery pack 40, if it is detected that the amount of electricity in the internal battery 10 is less than a first charging threshold, it is determined that the internal battery 10 needs to be charged, and if it is detected that the amount of electricity in the battery pack 40 is less than a second charging threshold, it is determined that the battery pack 40 needs to be charged. In another embodiment, if the amount of electricity in the internal battery 10 has not reached the rated capacity value, it is determined that the internal battery 10 needs to be charged, i.e., if it is detected that the amount of electricity in the internal battery 10 is insufficient, it is determined that the internal battery 10 needs to be charged, and if the amount of electricity in the battery pack 40 has not reached the rated capacity value, it is determined that the battery pack 40 needs to be charged, i.e., if it is detected that the amount of electricity in the battery pack 40 is insufficient, it is determined that the battery pack 40 needs to be charged.

[0114] When it is detected that a battery pack 40 is connected to the circuit of the energy storage device and requests charging, the battery pack 40 is charged preferentially, and then the internal battery 10 that needs to be charged is charged. When it is detected that two or more battery packs 40 are connected to the circuit of the energy storage device and request charging, the two or more battery packs 40 are charged preferentially, and then the internal battery 10 that needs to be charged is charged.

[0115] Further, a method for charging two or more battery packs 40, i.e., a method for setting the charging order of the battery packs, will be described. In one example, the lower voltage of the two or more battery packs 40 is charged preferentially until the lower voltage is fully charged, the lower voltage of the remaining battery packs 40 is charged, and charging is stopped until charging of the two or more battery packs 40 that require charging is completed; in another example, the higher voltage of the two or more battery packs 40 is charged preferentially until the higher voltage is fully charged, the higher voltage of the remaining battery packs 40 is continuously charged, and charging is stopped until charging of the two or more battery packs 40 that require charging is completed; in another example, the lower voltage of the two or more battery packs 40 is charged preferentially until the voltages of the two or more battery packs 40 that require charging are the same, and charging is performed simultaneously until charging is completed; in another example, two or more battery packs 40 are alternately charged until charging of each battery pack 40 that requires charging is completed.

[0116] In another example of the present application, the internal battery 10 is charged first, and the battery pack 40 is charged after charging of the internal battery 10 is completed. In another example of the present application, the internal battery 10 and the battery pack 40 are charged simultaneously.

[0117] In another example of the present application, the internal battery 10 and the battery pack 40 are charged according to a preset charging sequence.

[0118] In one embodiment, the internal battery 10 or the battery pack 40, whichever has the lower voltage, is given priority in charging, and after charging is completed, depending on the voltage situation, the remaining internal battery 10 and / or battery pack 40, whichever has the lower voltage, continues to be charged until charging is complete for both the internal battery 10 and the battery pack 40. Alternatively, the battery with the longer initial expected charging time is given priority in charging.

[0119] In one embodiment, the internal battery 10 or the battery pack 40, whichever has a higher voltage, is given priority in charging, and after charging is completed, the remaining internal battery 10 and / or battery pack 40, whichever has a higher voltage, continues to be charged until charging is complete for the internal battery 10 and the battery pack 40. Alternatively, the battery with the shortest expected charging time is given priority in charging.

[0120] In one embodiment, first, the internal battery 10 or the battery pack 40 with the lower voltage is charged until the voltages of the internal battery 10 and the battery pack 20 requesting charging become the same, and then the internal battery 10 and the battery pack 40 are charged until charging is completed. Alternatively, the internal battery 10 and the battery pack 40 are charged while preferentially charging the one with the longer real-time estimated charging time until the real-time estimated charging times match.

[0121] In one embodiment, the internal battery 10 and the battery pack 40 are charged alternately until charging of the internal battery 10 and the battery pack 40 is completed.

[0122] The completion of charging in this application includes cases where the voltage reaches the rated voltage of the device, i.e., the case of full charging, for example, when the voltage of the built-in battery 10 reaches its rated voltage or the built-in battery 10 is fully charged, when the voltage of the battery pack 40 reaches its rated voltage or the battery pack 40 is fully charged, and when the circuit connection between the object that needs to be charged and the energy storage device is cut off, for example, when the connection between the battery pack 40 and the energy storage device is cut off when charging.

[0123] Also, as can be understood, when the internal battery 10 and the battery pack 40 need to be charged simultaneously, the energy storage device is preferably in a charging state or switched from a non-charging state to a charging state and connected to an external power source to obtain power from outside the energy storage device, thereby charging the internal battery 10 and the battery pack 40.

[0124] In another example of the present application, when the energy storage device is in a non-charging state, the battery pack 40 may be used to charge the internal battery 10 and the battery pack 40 that needs to be charged, and the internal battery 10 may be used to charge the battery pack 40.

[0125] As shown in FIGS. 4A and 4B, when the energy storage device operates in a multi-function mode, it emits a discharging current and a charging current to power the load and charge the internal battery 10 and / or the battery pack 40, respectively.

[0126] As shown in Fig. 4A, when the energy storage device operates in a multi-function mode in a charging state, it preferentially converts the power of the external power source into a charging current and a discharging current. The power transmitter 20 obtains the power of the external power source through the input interface 21, converts it into a charging current and a discharging current through the inverter 22, and supplies it to the built-in battery 10 and / or the battery pack 40 and the load.

[0127] As shown in Fig. 4B, when the energy storage device operates in a multi-function mode in a non-charging state, it converts the power stored in the internal battery 10 into a second charging current and a discharging current, charges the battery pack 40, and supplies power to a load. In another example of the present application, the battery pack 40 and the internal battery 10 are connected in parallel to convert the power of the battery pack 40 into a charging current and a discharging current by the inverter 22, and the power of the battery pack 40 may be converted into a first charging current to charge the internal battery 10 in the reverse direction, may be converted into a second charging current to charge another battery pack 40 that requires charging, or may be converted into a discharging current to supply power to a load.

[0128] In particular, when no external power source is connected to the input interface 21, the control key controls whether the battery pack 40 is coupled to the inverter 22, and controls whether the battery pack 40 is discharged by the energy storage power source.

[0129] 5A and 5B, when the energy storage device supplies power only to the load, the energy storage device operates in a power supply mode. The method of supplying the discharge current in the power supply mode will be further described.

[0130] As shown in Fig. 5A, when the energy storage device operates in a power supply mode in a charging state, the energy storage device preferably converts an external power source into a discharge current to supply power to a load. The inverter 22 converts the power obtained from the input interface 21 into a discharge current, transmits the current to the load connected to the circuit by the output interface 23, and supplies power to the load.

[0131] As shown in Fig. 5B, when the energy storage device operates in a power supply mode in a non-charging state, it converts the power stored in the internal battery 10 into a discharge current and supplies power to a load. The inverter 22 converts the power of the internal battery 10 into a discharge current, transmits it to the load connected to the circuit via the output interface 23, and supplies power to the load. When the battery pack 40 is connected to the circuit of the energy storage device, the battery pack 40 and the internal battery 10 may be connected in parallel, and the discharge current may be released to supply power to the load. The inverter 22 converts the power of the battery pack 40 into a discharge current, transmits it to the load connected to the circuit via the output interface 23, and supplies power to the load.

[0132] In particular, the control key controls whether the battery pack 40 is coupled to the inverter 22, and when the control key controls the battery pack 40 so as not to be coupled to the inverter 22, the internal battery 10 outputs power to supply power to the load, and when the control key controls the battery pack 40 so as to be coupled to the inverter 22, the battery pack 40 outputs power to supply power to the load, in this case the energy storage device is in the second working state. If the load is an AC load, the inverter 22 may convert the power into an AC current and output it to the AC load.

[0133] When the battery pack 40 and the internal battery 10 are each connected to the inverter 22, the internal battery 10 outputs power preferentially to the inverter 22, and when the voltage of the internal battery drops to the low voltage protection threshold, the battery pack 40 switches the power supply source from the internal battery to the battery pack so as to output power to the inverter 22.

[0134] Furthermore, an embodiment of a parallel connection between the battery pack 40 and the internal battery 10 will be described. The parallel connection in this application means that the battery pack 40 may be discharged in the reverse direction by the energy storage device and may supply power to a load connected to the energy storage device together with the internal battery 10 as a power supply for the energy storage device, and in some cases, the battery pack 40 may be discharged in the reverse direction and charge the internal battery 10.

[0135] In one embodiment, when it is detected that the battery pack 40 is connected, a parallel connection signal is triggered to connect the battery pack 40 and the internal battery 10 in parallel, output in parallel, provide a discharge current, and power the load; in one embodiment, when the load and the energy storage device are connected with the battery pack 40 attached to the energy storage device, a parallel connection signal is triggered to connect the battery pack 40 and the internal battery 10 in parallel, and power the load.

[0136] In one embodiment, the energy storage power source has a parallel control key that controls whether the battery pack 40 is connected in parallel to the internal battery 10. The parallel control key is connected to the interface and conductively connected to the battery pack 40, and further controls whether the battery pack 40 can be connected in parallel to release a discharge current.

[0137] The user can freely select according to need by operating the parallel control key to select whether or not to connect the battery pack 40 in parallel to the built-in battery 10. Based on the user's operation of the parallel control key, a parallel connection signal is triggered to control the corresponding battery pack 40 and built-in battery 10 selected by the user to be connected in parallel.

[0138] Preferably, one parallel control key is provided to control whether the battery pack 40 is connected in parallel to the built-in battery 10, and preferably, two or more parallel control keys are provided to respectively control whether two or more battery packs 40 are connected in parallel to the built-in battery 10, that is, a corresponding parallel control key is provided for each battery pack 40, and the corresponding parallel control key is connected to an interface and connected to the corresponding battery pack 40, thereby controlling whether the corresponding battery pack 40 is connected in parallel to the built-in battery 10.

[0139] Preferably, the parallel control key is implemented as a switch-operated key having a selected state and a non-selected state, in which, in the selected state, the battery pack 40 corresponding to the parallel control key can be connected in parallel to the built-in battery 10, and in the non-selected state, the battery pack 40 corresponding to the parallel control key cannot be connected in parallel to the built-in battery 10. More preferably, the parallel control key is provided in the battery pack 40 to correspondingly control whether the battery pack 40 is connected in parallel, and even more preferably, the parallel control key is provided in the energy storage device to control whether the battery pack 40 is connected in parallel.

[0140] Preferably, the parallel control key is implemented as a screen, and the user can select whether or not to connect the battery pack 40 and the internal battery 10 in parallel by operating the screen, and select the battery pack 40 connected in parallel to the internal battery 10.

[0141] Next, an embodiment in which the battery pack 40 and the internal battery 10 are connected in parallel and then parallel output is performed will be described.

[0142] Preferably, after the battery pack 40 and the internal battery 10 are connected in parallel, the internal battery 10 discharges first, and after the internal battery 10 has completely discharged, the battery pack 40 discharges and continues to supply a discharge current to the load.

[0143] When two or more battery packs 40 are connected to the energy storage device and output in parallel with the internal battery 10, the discharge current of the battery packs 40 is released one by one after the internal battery 10 is discharged.

[0144] Preferably, the completion of discharge of the internal battery 10 is defined as the internal battery 10 discharging until the voltage becomes zero, and more preferably, the completion of discharge of the internal battery 10 is defined as the internal battery 10 discharging until the voltage becomes lower than a preset first low voltage threshold. In this case, the internal battery 10 enters a low voltage protection state and is prohibited from discharging. That is, the internal battery 10 has a low voltage protection mechanism, which prevents the voltage of the internal battery 10 from being too low and affecting normal use.

[0145] Preferably, the battery pack 40 is provided with a second low voltage threshold, and when the battery pack 40 discharges until the voltage is lower than the second low voltage threshold, the battery pack 40 completes discharging, stops discharging, and enters a low voltage protection state.

[0146] Furthermore, by setting the parallel connection conditions between the battery pack 40 and the internal battery 10, the battery pack 40 is selectively connected in parallel to the internal battery 10 based on whether the parallel connection conditions are met. The voltage of the battery pack 40 may be higher than the battery pack discharge threshold and selectively connected in parallel to the internal battery 10. The battery pack 40 may be selectively connected in parallel to the internal battery 10 only by having a certain amount of electricity. The battery pack discharge threshold is higher than the second low voltage threshold of the battery pack.

[0147] The internal battery 10, as the main power source of the energy storage device, preferentially releases a discharge current to supply power to the load, and the battery pack 40 may be connected in parallel to the internal battery 10 as a supplementary power source of the energy storage device to supply power to the load. Thus, by preferentially controlling the internal battery 10 to release a discharge current, when the power of the internal battery 10 is insufficient to meet the electrical usage demand of the load, the parallel-connected battery pack 40 may release a discharge current and continue to supply power to the load. Also, by preferentially releasing the power of the internal battery 10, power consumption of the battery pack 40 can be reduced or avoided when the power of the internal battery 10 is sufficient to meet the electrical usage demand of the load.

[0148] In another example of the present application, the parallel output method after the battery pack 40 and the internal batteries 10 are connected in parallel is implemented so that they are discharged in sequence according to a preset discharge order.

[0149] In one embodiment, the preset discharge sequence is implemented to sequentially control the discharge of the battery pack 40 and the built-in battery 10 from high voltage to low voltage, and in another embodiment, the preset discharge sequence is implemented to sequentially control the discharge of the battery pack 40 and the built-in battery 10 from low voltage to high voltage.

[0150] Preferably, the timing for switching the target to be discharged in a sequence is implemented so that the internal battery 10 and / or the battery pack 40 discharge until the voltage becomes zero, and preferably, the timing for switching the target to be discharged in a sequence is implemented so that the internal battery 10 discharges until the voltage becomes lower than a first low-voltage threshold, and / or the battery pack 40 discharges until the voltage becomes lower than a second low-voltage threshold.

[0151] In another example of the present application, the parallel output method after the battery pack 40 and the internal battery 10 are connected in parallel is implemented so that first, either the internal battery 10 or the battery pack 40, whichever has the higher voltage, discharges, and after the voltages of the internal battery 10 and the battery pack 40 are equalized, both the internal battery 10 and the battery pack 40 discharge.

[0152] [Charging circuit settings] From another viewpoint of the present application, the setting of the charging current of the energy storage device will be described. The power output port of the battery pack 40 is circuit-connected to the interface of the energy storage device, i.e., the battery pack 40 is circuit-connected to the circuit of the energy storage device. The battery pack 40 is connected to the circuit of the interface through the power output port, and is charged by obtaining power from the energy storage device.

[0153] In one example of the present application, a second charging branch circuit is provided between the interface and the input interface 21, that is, the second charging current output from the interface is derived from the power of the external power source obtained from the input interface 21.

[0154] The inverter 22 is circuit-connected to a second charging branch circuit between the interface and the input interface 21, thereby converting the power of the external power source obtained from the input interface 21 into a second charging current.

[0155] In one example of the present application, a second charging branch circuit is provided between the interface and the internal battery 10, i.e., the second charging current output from the interface flows out from the internal battery 10. The internal battery 10 discharges and charges the battery pack 40 with the second charging current.

[0156] The inverter 22 is circuit-connected to the second charging branch circuit between the interface and the internal battery 10, and converts the power output from the internal battery 10 into a second charging current.

[0157] In one example of the present application, a second charging branch circuit is provided between the internal battery 10 and the interface, and a second charging current flows into the battery pack 40 after flowing through the internal battery 10.

[0158] Furthermore, by providing a first charging branch circuit between the input interface 21 and the internal battery 10, power from an external power source is obtained from the input interface 21 and converted to a first charging current by the inverter 22, and the internal battery 10 is charged.

[0159] [Charge / discharge control system 100] The energy storage device is provided with a charge / discharge control system 100, which controls the charging and discharging of the energy storage device, and includes a detection unit 101, an identification unit 102, a comparison unit 103, a charging unit 104 and a discharging unit 105.

[0160] The detection unit 101 is connected to the circuit of the energy storage device, and detects the circuit state, each device connected to the circuit, and information of each device. Each device includes an internal battery 10, an input interface 21, a current converter 22, an output interface 23, a battery pack 40, a load, etc. The detection unit 101 detects and obtains the electrical information of each device.

[0161] The detection unit 101 detects the electrical information of the built-in battery 10, such as rated voltage, capacity, real-time voltage, etc., detects the charging state of the input interface 21, such as whether an external power source is connected, and obtains the current type of power, etc., detects the connection state of the output interface 23, such as whether a load is connected to the output interface 23, and if a load is connected, the detection unit 101 further detects and obtains the information of the load. When the energy storage device is started up, the detection unit 101 continues to detect the state information of the circuit of the energy storage device and each device in the circuit. When the battery pack 40 is attached to the energy storage device and conductively connected to the built-in battery 10, the detection unit 101 detects that the battery pack 40 is electrically connected to the energy storage device. The detection unit 101 further detects the electrical information of the battery pack 40, such as rated voltage, capacity, real-time voltage, etc.

[0162] The identification unit 102 is communicatively connected to the detection unit 101, and identifies the current state of each device and determines the power supply and the demand for electricity usage. The power supply includes the power supply of the external power source and the built-in battery 10, and may further include the power supply of the battery pack 40, and may further include the type of the external power source and the electrical information of the built-in battery 10 (including but not limited to real-time voltage, rated voltage, etc.). The demand for electricity usage is to supply power to the load, to charge the built-in battery 10, and / or to charge the battery pack 40, and further includes the electrical information of the load (including but not limited to electrical current type, electrical power, rated voltage, etc.), the electrical information of the built-in battery 10, and the electrical information of the battery pack 40 (including but not limited to real-time voltage, rated voltage, etc.).

[0163] The comparison unit 103 is communicatively connected to the identification unit 102, and compares the power supply source and the electricity usage demand, determines the current type and power of the power supply, the current type and power of the electricity usage, and further outputs a charging control command and / or a discharging control command, and executes the charging control command and / or the discharging control command by the charging unit 104 and / or the discharging unit 105.

[0164] The charging unit 104 is communicatively connected to the comparison unit 103, executes the charging control command sent by the comparison unit 103, and is circuit-connected to the circuit of the energy storage device and each device to control the charging of the energy storage device, converts the charging current for power supply into a charging current that meets the electricity usage demand, and charges the corresponding battery pack 40. The discharging unit 105 is communicatively connected to the comparison unit 103, executes the discharging control command sent by the comparison unit 103, and The power supply circuit is connected to the circuit of the energy storage device and each device to control the discharge of the energy storage device, convert the discharge current released for power supply into a discharge current that meets the demand for electricity use, and discharge it to the corresponding load.

[0165] First, an application scenario in which the energy storage device charges the internal battery 10 and / or the battery pack 40 will be described.

[0166] Specifically, the detection unit 101 detects that the battery pack 40 is electrically connected to the energy storage device. The detection unit 101 further detects and obtains real-time electrical information of the battery pack 40, and the identification unit 102 identifies that the real-time voltage of the battery pack 40 has not reached the rated voltage, determines that the current amount of electricity in the battery pack 40 is insufficient, and further identifies that the electrical usage demand is to charge the battery pack 40.

[0167] The detection unit 101 detects the electrical information of the built-in battery 10, and the identification unit 102 identifies that the electrical usage demand is to charge the built-in battery 10 if it determines that the real-time voltage of the built-in battery 10 has not reached the rated voltage.

[0168] The detection unit 101 detects that the input interface 21 is connected to an external power source and is in a charging state, and the identification unit 102 identifies that the power source is the external power source.

[0169] The comparison unit 103 compares the power supply and the electricity usage demand, and generates a charging control command to charge the internal battery 10 and the battery pack 40 with the power of the external power supply. The charging unit 104 executes the charging control command.

[0170] Preferably, when there is a simultaneous demand for electricity to charge the built-in battery 10 and the battery pack 40, the charging control command generated by the comparison unit 102 is a command to charge the battery pack 40 with priority, and to switch the charging target to charge the built-in battery 10 after charging of the battery pack 40 is completed.

[0171] When the detection unit 101 detects that two or more battery packs 40 are electrically connected to the energy storage device, and the identification unit 102 identifies that the real-time voltages of the two or more battery packs 40 have not reached the rated voltage, it identifies that the electricity usage demand is to charge the two or more battery packs 40, and the comparison unit 103 obtains the electricity usage demand of each battery pack 40, determines the charging manner of each battery pack 40 that needs to be charged, and outputs it as a charging control command. The charging unit 104 executes the charging control command to control the charging current to charge each battery pack 40.

[0172] In one example of charging two or more battery packs 40 in the present invention, the comparison unit 103 controls the charging unit 104 to simultaneously charge each battery pack 40 that needs to be charged. That is, the charging control command of the comparison unit 103 is a command to simultaneously charge each battery pack 40 whose electricity usage demand is charging. The charging unit 104 controls the charging current to flow into the battery packs 40 along the charging branch circuit connecting each battery pack 40, and to charge each battery pack 40 that needs to be charged.

[0173] In one example of charging two or more battery packs 40 in the present invention, the comparison unit 103 compares the electricity usage demand of each battery pack 40 to determine the charging priority of the battery packs 40, and sequentially charges each battery pack 40 that needs to be charged according to the charging priority, and the charging control instruction includes an instruction to sequentially charge each battery pack 40 that needs to be charged according to the charging priority of the battery packs. The charging unit 104 controls the charging current to flow into the battery packs 40 sequentially according to the charging priority, so as to sequentially charge the battery packs 40.

[0174] The comparison unit 103 presets the battery pack charging priorities, and generates corresponding charging control instructions according to the preset battery pack charging priorities to charge two or more battery packs 40.

[0175] In the example of battery pack charging priority setting, the battery pack 40 with the largest remaining charge is charged preferentially. The identification unit 102 identifies the real-time voltage of the battery pack 40, determines the remaining charge, and transmits it to the comparison unit 103, which compares the remaining charge of the battery packs 40, and determines the charging priority of each battery pack 40 that needs to be charged according to the remaining charge status of each battery pack 40, and outputs it as a charging control command. The charging unit 104 executes the charging control command to charge each battery pack 40 according to the battery pack charging priority. The charging unit 104 controls the charging current to flow preferentially into the battery pack 40 along the charging branch circuit of the battery pack 40 with the largest remaining charge, and first completes the charging of the battery pack 40 with a relatively large remaining charge, and then controls the charging current in sequence to sequentially charge the remaining battery packs 40 according to the priority order of the largest remaining charge.

[0176] By prioritizing charging of the battery pack 40 with the largest remaining charge, the charging of the battery pack 40 is processed quickly, and a fully charged battery pack 40 can be obtained as soon as possible and removed from the energy storage device for use.

[0177] In one example of battery pack charging priority setting, the battery pack 40 with the least remaining power is charged first. The identification unit 102 identifies the remaining power of the battery packs 40 that need to be charged, and the comparison unit 103 determines the charging priority of each battery pack 40 based on the remaining power status, and sends a charging control command to the charging unit 40. The charging unit 40 controls the charging current to flow first along the charging branch circuit of the battery pack 40 with the least remaining power to complete charging, and then to charge the remaining battery packs 40 in order of the priority of the least remaining power.

[0178] By giving priority to charging the battery pack 40 with the least remaining charge, the battery pack 40 with the least remaining charge can be converted to a usable state as quickly as possible, which is convenient for the user.

[0179] In another example of charging two or more battery packs 40 in the present invention, the comparison unit 103 instructs the charging unit 104 to charge the battery packs 40 alternately.

[0180] The comparison unit 103 is preset to discharge a charging current up to the charging threshold of the battery pack 40 each time. The comparison unit 103 charges one battery pack 40 until the charging threshold is reached, and then instructs the charging unit 104 to switch the charging target to charge another battery pack 40, and continue to alternately charge the other battery pack 40 after the charging threshold is reached. The charging threshold is implemented as one charging time or one charging amount.

[0181] In another example of setting the charging order of the internal battery 10 and the battery pack 40, the internal battery 10 is charged first, followed by the battery pack 40.

[0182] In another example, the internal battery 10 and the battery pack 40 are charged in the order from high voltage to low voltage, in another example, the internal battery 10 and the battery pack 40 are charged in the order from low voltage to high voltage, in another example, the internal battery 10 and the battery pack 40 are charged simultaneously, and in another example, the internal battery 10 and the battery pack 40 are charged alternately.

[0183] In another situation, the detection unit 101 detects that no external power source is connected to the input interface 21, and the identification unit 102 identifies that the voltage of the built-in battery 10 is not zero and has remaining power, and further identifies that the supply source is the built-in battery 10. The comparison unit 103 compares the supply source with the electricity usage demand, and generates a charging control command which is a command for the built-in battery 10 to charge the battery pack 40. The charging unit 104 receives the charging control command to control the built-in battery 10 to discharge a charging current to the battery pack 40.

[0184] Further, it will be described how to identify that the electricity usage demand is to charge the battery pack 40. In one situation, the detection unit 101 detects that the battery pack 40 is connected to the energy storage device and its electric circuit, and the identification unit 102 identifies the real-time voltage and the rated voltage of the battery pack 40, and identifies that the electricity usage demand is to charge the battery pack 40 if it determines that the real-time voltage has not reached the rated voltage.

[0185] In one situation, when the detection unit 101 detects that the battery pack 40 is connected to the energy storage device but does not detect that a load is connected to the energy storage device, and the identification unit 102 identifies that the real-time voltage of the battery pack 40 has not reached the rated voltage, it identifies that the electricity usage demand is to charge the battery pack 40.

[0186] In one situation, the detection unit 101 detects that the battery pack 40 is connected to the energy storage device and detects that the load is connected to the energy storage device, and the identification unit 102 identifies that the electricity usage demand is to charge the battery pack 40 and power the load when it identifies that the real-time voltage of the battery pack 40 has not reached the rated voltage. The identification unit 102 identifies a supply source and transmits the supply source and the electricity usage demand to the comparison unit 103. The comparison unit 103 compares the supply source with the electricity usage demand, and if the supply source is sufficient to meet the electricity usage demand, the comparison unit 103 sends a charge control command and a discharge control command to control the charging unit 104 and the discharging unit 105 to respectively discharge a charging current to the battery pack 40 and discharge a discharging current to the load.

[0187] In addition, the identification unit 102 identifies that the power supply is an external power source, and the comparison unit 103 compares the power supply being an external power source with the electricity usage demand, and if the external power source can meet the charging demand of the battery pack 40 and the electricity usage demand of the load, sends a charging control command and a discharging control command to control the charging unit 104 and the discharging unit 105 to respectively discharge a charging current to the battery pack 40 and discharge a discharging current to the load.

[0188] When the identification unit 102 identifies that the power supply is the built-in battery 10, the comparison unit 103 compares the power of the built-in battery 10 with the power of the battery pack 40 and the power of the load for electrical usage, and if the power and power are sufficient, the charging unit 104 controls the built-in battery 10 to discharge a charging current to the battery pack 40 and a discharging current to the load. If the power and power cannot be satisfied, it selects to preferentially discharge a discharging current or to discharge a charging current. Preferably, the built-in battery 10 is preferentially controlled to discharge a discharging current to the load to supply power to the load, thereby satisfying the demand of the user to use the load.

[0189] The detection unit 101 detects that an external power source is connected to the input interface 21, the identification unit 102 identifies the type of the external power source and outputs a power source to the comparison unit 103, the comparison unit 103 compares the power source with the electricity usage demand, determines the current transmission path and whether current conversion processing is required, and outputs a charging control command to the charging unit 104. The charging unit 104 controls the current to flow from the input interface 21 to the inverter 22, and if current conversion processing is required, controls the inverter 22 to convert the current, and then outputs a charging current that meets the electricity usage demand, thereby executing the charging control command to charge the battery pack 40.

[0190] The detection unit 101 continues to detect the real-time electrical information of the battery pack 40, and when it detects that the real-time voltage of the battery pack 40 reaches the rated voltage, it sends a charging completion signal to the charging unit 104, and the charging unit 104 stops charging the corresponding battery pack 40. The charging unit 104 continues to alternately discharge a charging current for one charging time to the remaining battery packs 40 until the detection unit 101 detects that the real-time voltage of each battery pack 40 that needs to be charged reaches the rated voltage and feeds back to the charging unit 104, and the charging unit 104 stops the charging current input to the battery pack 40. Alternatively, when the detection unit 101 detects that the real-time voltage of the battery pack 40 reaches a preset value, it sends a charging completion signal to the charging unit 104, and the charging unit 104 stops charging the battery pack 40 whose voltage has reached the preset value, and continues to alternately charge the remaining battery packs 40 that need to be charged until the real-time voltages of the battery packs 40 that need to be charged all reach the preset value and charging is completed.

[0191] Alternatively, the user manually controls the battery pack 40 that needs to be charged to be connected to the energy storage device, and then charges the battery pack 40. The battery pack 40 is provided with a physical switch that controls the on / off of the battery pack 40. The user may manually operate the physical switch to turn on the battery pack 40, thereby conductively connecting the battery pack 40 to the energy storage device, and then charge the battery pack 40. The user may manually turn on the battery pack 40 that is to be charged, as necessary, so that the battery pack 40 is charged.

[0192] Next, an application scenario in which the energy storage device discharges to a load will be described.

[0193] After the load is connected to the energy storage device and the identity information of the load and the energy storage device are successfully mutually identified, the load and the energy storage device are conductively connected, and the load transmits an electricity usage request to the energy storage device.

[0194] Specifically, the energy storage device is started up, and the detection unit 101 detects the circuit of the energy storage device and each device connected to the circuit. A load is connected to the output interface 23, and the detection unit 101 detects that the load is connected to the circuit of the energy storage device, and further obtains an electricity usage request sent from the load, and detects the information of the load. The identification unit 102 identifies the power supply source and the electricity usage demand based on the detection situation by the detection unit 101.

[0195] In one scene of the present invention, the detection unit 101 detects that the input interface 21 is connected to an external power source and the output interface 23 is connected to a load, and detects the information of the load, the identification unit 102 identifies that the power supply is the input interface 21, and identifies the electricity usage demand of the load according to the information of the load. The comparison unit 103 compares the power supply and the electricity usage demand to determine the current input for power supply and the current that needs to be output for discharge, and outputs a discharge control command, and the discharge unit 105 controls the discharge current to be discharged from the power supply to the load, and if the discharge current needs to undergo current conversion processing, performs the desired current conversion processing, and executes the discharge control command to discharge a discharge current that meets the electricity usage demand to the load. The discharge unit 105 controls the current of the input interface 21 to flow into the inverter 22, and if the current conversion processing needs to be performed, performs the corresponding conversion on the circuit, and then the inverter 22 outputs the discharge current, which is transmitted to the load by the output interface 23, and supplies power to the load. That is, the current acquired by the input interface 21 is processed by the inverter 22 to become a discharge current that meets the electrical demand of the load, and is transmitted to the load by the output interface 23 .

[0196] In one scenario of the present invention, the detection unit 101 detects that the input interface 21 is not connected to an external power source and that power is stored in the built-in battery 10, and detects the information of the load, and the identification unit 102 identifies that the supply source is the built-in battery 10 and the discharge power of the built-in battery 10, and the electrical usage demand is the electrical usage of the load and the electrical usage demand power of the load. The comparison unit 103 compares the discharge power of the built-in battery 10 with the electrical usage demand power of the load to determine the discharge path and whether or not current conversion processing is required, and if the discharge power of the built-in battery 10 is sufficient to meet the electrical usage demand power of the load, the discharge unit 105 controls the built-in battery 10 to release the discharge current to flow through the inverter 22, and if current conversion processing is required, controls the inverter 22 to perform the corresponding current conversion processing, and outputs the discharge current that meets the electrical usage demand to the output interface 23, and transmits it to the load through the output interface 23 to supply power to the load.

[0197] In one scenario of the present invention, the battery pack 40 and the internal battery 10 may be used to discharge together depending on the situation. The battery pack 40 is used to expand the capacity of the energy storage device to meet higher electricity usage demands.

[0198] In a preferred embodiment, the detection unit 101 detects the load connection, the identification unit 102 identifies the power supply demand of the load, and the detection unit 101 detects that no external power supply is connected to the energy storage device, and the power supply of the identification unit 102 is the built-in battery 10. If the detection unit 101 detects that the battery pack 40 is connected, the identification unit 102 identifies that the battery pack 40 may be the power supply. The comparison unit 103 compares the power supply and the electricity usage demand, and the discharge control command generated is a command to connect the built-in battery 10 and the battery pack 40 in parallel.

[0199] The parallel connection method of the internal battery 10 and battery pack 40 is implemented as a parallel connection of the internal battery 10 and battery pack 40 in response to the load's electricity usage request and connection of the battery pack 40, or as a parallel connection of the selected battery pack 40 and the internal battery 10 in response to operation of the parallel control key, or as a parallel connection of the battery pack 40 and the internal battery 10 when the voltage of the internal battery 10 is lower than the first low voltage threshold.

[0200] Furthermore, the discharge control command includes a parallel output method for the internal battery 10 and the battery pack 40.

[0201] In one example, the parallel output method involves switching the discharge units so that the internal battery 10 discharges first, and then the parallel-connected battery pack 40 discharges after the internal battery 10 has completely discharged.

[0202] The completion of discharge of the internal battery 10 is preferably when the voltage of the internal battery 10 is zero or when the voltage of the internal battery 10 is lower than the first low voltage threshold.

[0203] In one example, in the parallel output method, first, the internal battery 10 or the battery pack 40, whichever has the higher voltage, is discharged, and after the voltages of the internal battery 10 and the battery pack 40 are equalized, both the internal battery 10 and the battery pack 40 are discharged.

[0204] The identification unit 102 identifies that two or more battery packs 40 are connected in parallel with the built-in battery 10 as a power supply, and the discharge control command generated by the comparison unit 103 further includes a command to control the discharge of the two or more battery packs according to a preset discharge sequence of the battery packs 40 after switching the discharge unit so that the battery packs 40 are discharged.

[0205] In one embodiment, the discharge sequence of the battery packs is preset to control each of the parallel-connected battery packs 40 to discharge in sequence according to a discharge sequence from high voltage to low voltage.

[0206] In one embodiment, the discharge sequence of the battery packs is preset to control each of the parallel-connected battery packs 40 to discharge in sequence according to a discharge sequence from low voltage to high voltage.

[0207] In one embodiment, the discharge sequence of the battery packs is preset so that the higher voltage battery pack 40 discharges first, then the voltages of the lower voltage battery packs 40 are equalized and then discharged together, and the voltages of the parallel-connected battery packs 40 are equalized and then discharged together.

[0208] Specifically, the detection unit 101 detects that no external power source is connected to the input interface 21 and that power is stored in the internal battery 10, and detects that the battery pack 40 is electrically connected to the circuit of the energy storage device, and the identification unit 102 identifies that the supply power source may be selected from the internal battery 10 and / or the battery pack 40. The identification unit 102 also identifies the electrical usage demand power of the load based on the load information detected by the detection unit 101, and identifies the discharge power of the internal battery 10 and the battery pack 40. The comparison unit 103 determines the power supply target, the discharge path, and whether or not current conversion processing is required based on the electrical usage demand power of the load and the power supply power of the internal battery 10 and the battery pack 40, and outputs a discharge control command to the discharge unit 105.

[0209] The identification unit 102 identifies the electricity usage demand of the load based on the load information (including the electricity usage demand power and the electricity usage current type) detected and obtained by the detection unit 101. The identification unit 102 identifies the real-time voltage of the internal battery 10 and the real-time voltage of the battery pack 40 based on the electrical information of the internal battery 10 and the battery pack 40 detected and obtained by the detection unit 101, and determines the discharge power of the internal battery 10 and the discharge power of the battery pack 40. The comparison unit 103 compares the electricity usage demand power of the load based on the discharge power of the internal battery 10 and the battery pack 40, and compares the type of discharge current discharged by the internal battery 10 and the battery pack 40 with the type of current required by the load, to determine the target of the discharge current and whether current conversion processing is required for the discharge current.

[0210] In one parallel connection discharge example of the present invention, the internal battery 10 and the battery pack 40 are connected in parallel to discharge to a load. That is, the detection unit 101 detects that the load and the battery pack 40 are connected to the energy storage device, and the identification unit 102 identifies that the power required by the load and the power supply source are the internal battery 10 and the battery pack 40. The comparison unit 103 outputs a discharge control command for the internal battery 10 and the battery pack 40 to be connected in parallel to discharge to the load together, and determines whether a current conversion process is required. The discharge unit 105 controls the internal battery 10 and the battery pack 40 to be connected in parallel to discharge a discharge current, and if a current conversion process is required, the discharge current flows through the inverter 22 and is converted into a current, and then transmitted to the load by the output interface 23 to supply power to the load. That is, when the battery pack 40 is connected to the energy storage device and detects that the load is connected to the energy storage device and needs to use power, the energy storage device connects the internal battery 10 and the battery pack 40 in parallel to discharge a discharge current to supply power to the load.

[0211] Furthermore, the comparison unit 103 determines the parallel connection method of the internal battery 10 and the battery pack 40 based on the electrical information of the internal battery 10 and the battery pack 40. The comparison unit 103 compares the real-time voltages of the internal battery 10 and the battery pack 40, and if the voltages of the internal battery 10 and the battery pack 40 are different, it controls the discharge unit 105 to adjust the voltages of the internal battery 10 and the battery pack 40 first, and controls the internal battery 10 and the battery pack 40 so that they are connected in parallel after the voltages of the internal battery 10 and the battery pack 40 are balanced. Note that the voltage adjustment method may be a method of lowering the voltage of the high-voltage internal battery 10 or battery pack 40 to the same voltage as the low-voltage battery pack 40 or internal battery 10, or a method of boosting the voltage of the low-voltage internal battery 10 or battery pack 40 to the same voltage as the high-voltage battery pack 40 or internal battery 10. When the voltages of the internal battery 10 and the battery pack 40 become the same, the discharge unit 104 controls the internal battery 10 and battery pack 40 so that they are connected in parallel to release a discharge current, which is output to the load via the output interface 23, supplying power to the load.

[0212] In one parallel connection discharge example of the present invention, whether to connect the internal battery 10 and the battery pack 40 in parallel is selected based on the electrical power demand of the load and the electrical quantity status of the internal battery 10. Specifically, the identification unit 102 identifies the electrical power demand of the load and the discharge power of the internal battery 10, the comparison unit 103 compares the discharge power of the internal battery 10 with the electrical power demand of the load, and if the discharge power of the internal battery 10 exceeds the electrical power demand of the load, the comparison unit 103 determines that the internal battery 10 will discharge to the load and outputs a corresponding discharge control command to the discharge unit 105, and the discharge unit 105 controls the internal battery 10 to release a discharge current and transmit it to the load via the output interface 23. If the comparison unit 103 analyzes that the discharge power of the built-in battery 10 cannot meet the electrical usage demand power of the load, the identification unit 102 identifies the discharge power of the battery pack 40, and if two or more battery packs 40 are connected to the energy storage device, the identification unit 102 respectively identifies the discharge power of each battery pack 40 based on the information detected and obtained by the detection unit 101. The comparison unit 103 obtains the discharge power of each battery pack 40, combines the discharge power of the internal battery 10 with the power demand for electricity usage of the load, and determines that the discharge power of the internal battery 10 cannot meet the power demand for electricity usage of the load, and therefore the internal battery 10 and the battery pack 40 must be connected in parallel. Furthermore, the comparison unit 103 compares the discharge power of the internal battery 10 and the battery pack 40 with the power demand for electricity usage of the load, determines the battery pack 40 connected in parallel to the internal battery 10, and outputs this as a discharge control command. The discharge unit 105 controls the corresponding battery pack 40 and internal battery 10 to be connected in parallel and release a discharge current based on the discharge control command. If the voltages are different, the internal battery 10 and the battery pack 40 are connected in parallel in a voltage-balanced state after voltage adjustment. The voltage adjustment method may be step-up or step-down.

[0213] Preferably, the voltage regulation method for the internal battery 10 and the battery pack 40 that need to be connected in parallel is step-down. Step-down processing is performed on the internal battery 10 or battery pack 40 with a higher voltage, for example, by first discharging a certain current to reduce the voltage, and after the internal battery 10 and the battery pack 40 reach a voltage-balanced state, the internal battery 10 and the battery pack 40 are connected in parallel and a discharge current is discharged. Specifically, the identification unit 102 identifies the real-time voltages of the internal battery 10 and the battery pack 40, and the comparison unit 103 compares the real-time voltages of the internal battery 10 and the battery pack 40 to find that they are different, and the comparison unit 103 instructs the discharge unit 105 to control the internal battery 10 or battery pack 40 with a higher voltage to first discharge a portion of the current to achieve step-down.

[0214] Preferably, an adjustment unit 106 is provided, which is communicatively connected to the comparison unit 103, which determines a voltage adjustment manner for the internal battery 10 and / or the battery pack 40 based on the real-time voltage information of the internal battery 10 and the battery pack 40, and outputs a voltage adjustment command to the adjustment unit 106. The adjustment unit 106 executes the voltage adjustment command, and after the execution is completed, sends a voltage adjustment completion signal to the comparison unit 103, and in response to the voltage adjustment completion signal, the comparison unit 103 sends a discharge control command to instruct the discharge unit 105 to connect the internal battery 10 and the battery pack 40 in parallel to release a discharge current.

[0215] When adjusting the voltage of the internal batteries 10 and battery packs 40 that need to be connected in parallel using a step-down method to a balanced state, the adjustment unit 106 steps down the voltage of the internal battery 10 or battery pack 40 with the higher voltage.

[0216] Preferably, the voltage regulation method for the internal battery 10 and the battery pack 40 that need to be connected in parallel may be voltage boosting, and the regulation unit 106 boosts the voltage of the internal battery 10 or battery pack 40 with a lower voltage.

[0217] Preferably, the adjustment unit 106 adjusts the voltages of the internal battery 10 and the battery pack 40 to reach a voltage balance threshold, thereby putting the internal battery 10 and the battery pack 40 into a voltage balanced state. The internal battery 10 and / or the battery pack 40 reach a voltage balanced state through a voltage boost or voltage drop process by the adjustment unit 106.

[0218] In one example of parallel connection discharge of the present invention, whether or not it is necessary to connect the internal battery 10 and the battery pack 40 in parallel is selected by combining the circuit states based on the power demand for electrical usage of the load, the electrical quantity status of the built-in battery 10, and the status of selecting the battery pack 40, and if necessary, a battery pack 40 connected in parallel to the internal battery 10 is further selected, and an appropriate battery pack 40 is selected for parallel connection based on the operating status of the battery pack 40.

[0219] Specifically, the detection unit 101 detects the circuit state and the state of each device connected to the circuit, in particular the operating state of the battery pack 40, and the identification unit 102 uses this to identify whether the circuit of the battery pack 40 is normal or not. If it is determined that the battery pack 40 is normal, it identifies that the battery pack 40 can be used as a power supply. If it is determined that the battery pack 40 is abnormal, it identifies that the battery pack 40 cannot be used as a power supply. That is, the identification unit 102 identifies that a battery pack 40 in a normal operating state may be connected in parallel to the internal battery 10 as a power supply. By selecting a battery pack 40 in a normal operating state and connecting them in parallel, it is possible to ensure discharge safety. When voltage balancing is required, the adjustment unit 106 adjusts the internal battery 10 and the battery pack 40 that needs to be connected in parallel to a voltage balanced state, and then the discharge unit 105 controls the internal battery 10 and the battery pack 40 to be connected in parallel to discharge a discharge current.

[0220] That is, when the battery pack 40 is connected to the energy storage device and there is a need to supply power to a load through the energy storage device, it is determined whether the battery packs 40 need to be connected in parallel based on the discharge power of the internal battery 10 and the electrical power demand of the load, and both are discharged to the load, and when the discharge power of the internal battery 10 cannot meet the electrical power demand of the load, the internal battery 10 and the battery packs 40 are connected in parallel, so that the discharge power meets the power demand of the load and a discharge current can be discharged to the load. When two or more battery packs 40 are connected to the energy storage device, it is determined which battery packs 40 are connected in parallel to the internal battery 10 based on the electrical power demand of the load and the discharge power of the internal battery 10 and each battery pack 40, so that the discharge power of the parallel connection can meet the power of the load.

[0221] The energy storage device further has a discharge switching function, and when the input interface 21 is connected to an external power source, the power of the external power source can be used to meet the electrical demand of the load and / or the battery pack 40 and charge the built-in battery 10; when the input interface 21 is disconnected from the external power source and the output interface 23 is kept connected to the load, the power supply can be switched to the built-in battery 10 and / or the battery pack 40, so that the built-in battery 10 and / or the second unit 40 can supply power to the load. Therefore, when the load continuously requests the energy storage device to use electricity, even if the charging state of the input interface 21 changes, the built-in battery 10 and / or the battery pack 40 can be switched to and discharged as the power supply in a timely manner, so that the load can be continuously charged and the electrical usage state can be maintained.

[0222] Specifically, when the detection unit 101 detects that the input interface 21 is connected to an external power source or the input interface 21 is in a charging state, the identification unit 102 identifies that the power source is an external power source. The load is connected to the energy storage device, the detection unit 101 detects that the load is connected to the energy storage device, and the identification unit 102 identifies that the electricity usage demand is power supply to the load. The comparison unit 103 compares the power source and the electricity usage demand, analyzes the current type of the power source and the electricity usage demand current type of the load, determines the type and power of the discharge current that needs to be output, generates a discharge control command and sends it to the discharge unit 105, and the discharge unit 105 executes the discharge control command to control the input interface 21 to output the discharge current, and if a current conversion process is required, controls the inverter 22 to convert the current type, and outputs a discharge current that meets the electricity usage demand through the output interface 23 to supply power to the load. When the detection unit 101 detects that the amount of electricity in the built-in battery 10 is insufficient, the identification unit 102 identifies that the electricity usage demand further includes charging the built-in battery 10, and the comparison unit 103 sends a charging control command to instruct the charging unit 104 to convert the power obtained by the input interface 21 into a charging current to charge the built-in battery 10. The energy storage device may be in a state of charging while discharging.

[0223] During the power supply process, when the detection unit 101 detects that the input interface 21 is disconnected from the external power source or suspends the acquisition of power from the external power source, the input interface 21 switches from a charging state to a non-charging state, and the amount of electricity is stored in the built-in battery 10. The identification unit 102 identifies that the power supply source is switched to the built-in battery 10 and the electricity usage demand is to supply power to the load. The comparison unit 103 sends a new discharge control command according to the new power supply source and the electricity usage demand, instructing the charging unit 104 to stop discharging the charging current, the discharging unit 105 switches the power supply source to the built-in battery 10 and controls the built-in battery 10 to discharge a discharging current, and if current conversion processing is required, the discharging current is processed by the inverter 22 and then the output interface 23 outputs a discharging current that meets the electricity usage demand of the load to supply power to the load.

[0224] In the process of connecting an external power source to the input interface 21 to supply power to a load, if the detection unit 101 detects that the battery pack 40 is connected to an energy storage device, the identification unit 102 identifies that the battery pack 40 is short of electricity and that the demand for electricity to charge the battery pack 40 has increased, and the comparison unit 103 compares the supply power source with the new demand for electricity, controls the charging current to flow into the battery pack 40 via the built-in battery 10 to supply power to the battery pack 40, and sends a new charging control command to instruct the charging unit 104 to supply power to the battery pack 40. At the same time, the charging unit 104 charges the built-in battery 10, and the discharging unit 105 may supply power to the load.

[0225] In the above power supply process, when the detection unit 101 detects that the input interface 21 is disconnected from the external power source or suspends the acquisition of power from the external power source, the input interface 21 is converted from a charging state to a non-charging state, the amount of electricity is stored in the built-in battery 10, the amount of electricity is stored in the battery pack 40, and the identification unit 102 identifies that the supply source is selectively switched to the built-in battery 10 and / or the battery pack 40. The identification unit 102 identifies that the electricity usage demand is power supply to the load, and there is no need to charge the built-in battery 10 and / or the battery pack 40. The comparison unit 103 compares the new supply source with the electricity usage demand to determine a new current transmission path and a current conversion process. The comparison unit 103 releases a discharge current to supply power to the load, and if a current conversion process is required, instructs the discharge unit 104 to connect the built-in battery 10 and the battery pack 40 in parallel so that the discharge current may be output according to the electricity usage demand after the inverter 22 processes the discharge current. Alternatively, the comparison unit 103 compares the discharge power of the internal battery 10 and the battery pack 40 with the power demand for electricity usage of the load, and if the discharge power of the internal battery 10 is sufficient to meet the power demand for electricity usage of the load, the current output path is from the internal battery 10 to the load, and the comparison unit 103 instructs the discharge unit 105 to control the internal battery 10 to release the discharge current and output it to the load after undergoing the necessary current conversion process. If the discharge power of the internal battery 10 is insufficient to meet the power demand for electricity usage of the load, the internal battery 10 and the battery pack 40 are connected in parallel, and the current transmission path is set to connect the internal battery 10 and the battery pack 40 in parallel and output it to the load. Furthermore, the voltages of the internal battery 10 and the battery pack 40 are compared, and if the voltages are not in a balanced state, the adjustment unit 106 is instructed to adjust the voltages of the internal battery 10 and the battery pack 40 to a balanced state, and then the discharge unit 105 controls the internal battery 10 and the battery pack 40 to be connected in parallel and release the discharge current to the load.

[0226] In addition, after the battery pack 40 is attached to the energy storage device, the battery pack 40 and the energy storage device need to be electrically connected so that the battery pack 40 is electrically connected to the circuit of the energy storage device. In one embodiment, the battery pack 40 and the energy storage device perform communication identification. The battery pack 40 and the energy storage device perform communication identification with each other, and the built-in battery 10 and the energy storage device identify each other, and when the identification is successful, they are electrically connected. In another embodiment, a physical switch is provided in the battery pack 40, and the on / off of the battery pack 40 is controlled by the physical switch. The battery pack 40 is attached to the energy storage device, the physical switch of the battery pack 40 is pressed to turn on the battery pack 40 and electrically connect the battery pack 40 and the energy storage device, or the battery pack 40 is turned on, the battery pack 40 and the energy storage device communicate with each other to identify each other, and after the identification is successful, the battery pack 40 and the energy storage device are electrically connected to each other to transmit current.

[0227] The communication identification method will be further described. The battery pack 40 is attached to the energy storage device, a level signal is sent from the battery pack 40 to the energy storage device, the BMS module of the energy storage device is activated, and an identification signal is sent to the battery pack 40, for example, an identification code stored in the energy storage device is sent to the battery pack 40, the battery pack 40 receives the identification code, and if the identification is successful, the identification code of the battery pack 40 is fed back to the energy storage device, and if the identification of the energy storage device is successful, the communication identification between the energy storage device and the battery pack 40 may be successful and conductively connected. That is, the energy storage device and the battery pack 40 perform handshake communication, and if the handshake communication is successful, the battery pack 40 and the energy storage device are conductively connected. The BMS module of the battery pack 40 and the BMS module of the energy storage device may perform mutual communication identification.

[0228] After the battery pack 40 is attached to the housing 30, the interfaces of the battery pack 40 are at least partially shielded by the housing 30 so that the interfaces of the battery pack 40 are not used. That is, after the battery pack 40 is connected to the energy storage device, the battery pack 40 itself cannot discharge and only transmits current to and from the energy storage device.

[0229] In addition, the detection unit 101 detects the circuit state of the energy storage device and the operation state of each device connected to the circuit of the energy storage device, so that the identification unit 102 identifies whether there is a circuit abnormality or a device operation abnormality. If it is detected that the circuit through which the charging current flows is abnormal or the circuit inside the battery pack 40 is abnormal, the comparison unit 103 controls the charging unit 104 to stop charging the battery pack 40. If it is detected that the circuit through which the discharging current flows is abnormal or the circuit inside the load is abnormal, the comparison unit 103 controls the discharging unit 105 to stop power supply to the load. If the circuit state returns to normal, charging or discharging is resumed.

[0230] Another preferred example of the present invention differs from the preferred embodiments described above in that, as shown in Figures 7 and 8, the housing 30 of the energy storage device is a separate housing 30A, the housing 30A includes a first housing 31A and a second housing 32A, the internal battery 10 is provided in the first housing 31A, the power transmitter 20 is provided in the second housing 32A, the first housing 31A and the second housing 32A are detachably connected, and the internal battery 10 and the power transmitter 20 are detachably connected. After the internal battery 10 and the power transmitter 20 are connected, they may be conductive to transmit current.

[0231] The first housing 31A and the second housing 32A are provided with an internal battery interface and a power transmitter interface, respectively, the internal battery interface is circuit-connected to the internal battery, and the power transmitter interface is circuit-connected to the power transmitter 20, and after the first housing 31A and the second housing 32A are connected to each other, the internal battery interface and the power transmitter interface are electrically connected to each other, thereby connecting the internal battery 10 and the power transmitter 20 in a circuit and transmitting current. The internal battery 10 may be discharged to the power transmitter 20 as a power supply for the power transmitter 20. The internal battery 10 may obtain power from the power transmitter 20, and obtains power so that the internal battery 10 is charged when the power transmitter 20 is connected to an external power source.

[0232] At least one accommodating cavity 301A is provided in the first housing 31A, and the accommodating cavity 301A accommodates a battery pack 40, which is accommodated in the accommodating cavity 301A and then conductively connected to the internal battery 10. After the battery pack 40 is placed in the accommodating cavity 301A, at least a portion of the outer circumferential surface 41 of the battery pack 40 is enclosed by the accommodating cavity 301A.

[0233] One or more first DC interfaces 311A ​​are provided in the first housing 31A, and the first DC interfaces 311A ​​are electrically connected to the internal battery 11 and output DC current to the outside. The internal battery 10 may output DC current independently via the first DC interface 311A. A second DC interface 321A and an AC output interface 322A are provided in the second housing 32A, and the second DC interface 321A and the AC output interface 322A are each connected to the power transmitter 20, which outputs DC current and AC current.

[0234] Preferably, the first housing 31A is disposed at the tip of the second housing 32A, and the second housing 32A functions as the base of the first housing 31A. That is, the internal battery 10 is disposed at the tip of the power transmitter 20, and the power transmitter 20 functions as the base of the internal battery 10.

[0235] After the internal battery 10 is charged, the first housing 31A may be removed from the second housing 32A to allow the internal battery 10 to be used independently. The power transmitter 20 may be used independently when an external power source is connected to supply power to a load. The battery pack 40 may be attached to the first housing 31A and charged by the internal battery 10, and the internal battery 10 may supply power to a load independently. The battery pack 40 may supply power to a load independently after being charged. When the internal battery 10 and the battery pack 40 are connected, it may be possible to select whether or not to supply power to a load connected to the internal battery 10 after connecting them in parallel, as necessary.

[0236] That is, when the internal battery 10 is used independently, it may supply power to a load connected to the internal battery 10 alone, or it may be connected in parallel to the second battery pack 40 and then supply power to the load.

[0237] Preferably, a screen 33A is provided on the first housing 31A, and the screen 33A is circuit-connected to the internal battery 10 to obtain power, display information about the internal battery 10, and interact with the user.

[0238] Preferably, the second housing 32A is provided with a screen that is in circuit connection with the transmitter 20 to obtain power, display transmitter information, and interact with the user.

[0239] The charge / discharge control system controls the charging and discharging of the energy storage device, and differs from the above preferred embodiment in that the detection unit 101 detects whether the energy storage device is in a separate state or a combined state. When the energy storage device is in a separate state, the built-in battery 10 and the power transmitter 20 operate independently, and the built-in battery 10 can output DC current independently, and the power transmitter 20 can output AC current and DC current. When the energy storage device is in a combined state, In one example of the present invention, the energy storage device further includes a communication module, which is connected to the power transmitter 20 and the internal battery 10 and transmits information to and from the power transmitter 20 and the internal battery 10. The communication module is communicatively connected to a terminal and interacts with the terminal. A user operates the terminal to obtain information about the energy storage device and obtains information and operating states of the internal battery 10 and the power transmitter 20. The user transmits an operating command to the energy storage device through the terminal to control the operation of the energy storage device.

[0240] For example, the user may obtain information on the amount of electricity in the built-in battery 10, charge / discharge operation information, the charging status, current conversion status, current output status, and the like of the power transmitter 20 through communication between the terminal and the communication module.

[0241] When the battery pack 40 and / or a load are connected to the energy storage device, the communication module acquires information and status of the battery pack 40 and / or the load and feeds it back to the terminal, thereby allowing the user to acquire and monitor the information and operating status of the battery pack 40 and / or the load, grasp the electrical quantity information, charging / discharging information, and parallel connection information of the battery pack 40, and grasp the electrical usage and operating status of the load, etc.

[0242] Furthermore, the communication module is communicatively connected to the charge / discharge control system 100 so that a user can operate the charge / discharge control system 100 through a communication connection between a terminal and the communication module to control charging and discharging of the energy storage device.

[0243] By providing a communication module in the energy storage device, the energy storage device may be a kind of Internet of Things application terminal to realize intelligent thing connection, and a user may operate the energy storage device through the terminal to set functions. Specifically, the user may instruct the energy storage device through the terminal to charge the built-in battery 10, supply power to a load, charge the battery pack 40, select which battery pack 40 to charge, select whether to connect the built-in battery 10 and the battery pack 40 in parallel, and select the battery pack 40 connected in parallel to the built-in battery 10. In response to the user's operation, the terminal transmits a corresponding control command, and the energy storage device executes the control command to charge and / or discharge.

[0244] The charging and discharging control system 100 may obtain control commands of the terminal, and the charging unit 104 and the discharging unit 105 may execute the charging-related commands and the discharging-related commands, respectively. The charging and discharging control system 100 feeds back the corresponding execution status and the operating status of each device to the terminal.

[0245] As can be understood, the communication between the terminal and the energy storage device may be established by the cloud. The terminal sends an instruction to the cloud, which transfers it to the energy storage device, and the energy storage device executes the relevant instruction. The energy storage device may feed back information to the cloud, and the cloud may send relevant information of the energy storage device to the terminal and store the information of the energy storage device. The communication method between the terminal and the energy storage device may be WIFI, Bluetooth, mobile communication, Ethernet, RF communication, etc.

[0246] [Charge / discharge control method] According to another aspect of the present application, the present application further comprises: connecting the battery pack to an energy storage device; When it is detected that the built-in battery and the battery pack need to be charged simultaneously, charging the battery pack with priority, and charging the built-in battery after charging of the battery pack is completed is provided.

[0247] The charging control method is The method further includes charging the two or more battery packs according to a preset battery pack charging priority.

[0248] The charge and discharge control method is as follows: detecting a load connected to the energy storage device and requesting power consumption; Identifying the internal battery as a power supply source and supplying power to the load; The method further includes the steps of detecting that the battery pack is connected to a circuit of the energy storage device, identifying the battery pack as a power supply, connecting the battery pack and the built-in battery in parallel, and outputting a discharge current in parallel to supply power to the load.

[0249] The discharge control method is as follows: The method further includes the step of detecting that the battery pack is connected to the circuit of the energy storage device when the battery pack is connected to a load, i.e., identifying the battery pack as a power supply.

[0250] The discharge control method is as follows: The method further includes the step of operating a parallel control key to control the corresponding battery pack and the built-in battery to be connected in parallel.

[0251] The discharge control method is as follows: The method further includes a step of controlling the built-in battery to discharge first after connecting the built-in battery and the battery pack in parallel, and switching the discharge unit so that the battery pack discharges after the built-in battery has been discharged.

[0252] The discharge control method further includes a step of connecting the internal battery and the battery pack in parallel, and then controlling the internal battery and the battery pack so that they discharge in sequence according to a preset discharge sequence.

[0253] The discharge control method further includes a step of connecting the built-in battery and the battery pack in parallel, discharging the one with the higher voltage first, and discharging both the built-in battery and the battery pack after the voltages of the built-in battery and the battery pack are equalized.

[0254] With reference to the above embodiments, as shown in Figs. 9 and 10, the present invention further provides a charge / discharge control method for controlling charging and discharging of an energy storage device. The charge / discharge control method includes: Detecting whether a battery pack and / or a load is connected to the energy storage device to identify an electrical usage demand of the energy storage device; The step includes comparing the power supply status with the electricity usage demand, selectively discharging a charging current and / or a discharging current, and selectively connecting the built-in battery and the battery pack in parallel to supply power to the load.

[0255] The method is: When the battery pack is connected to the energy storage device and it is determined that the battery pack is insufficient in amount of electricity, the battery pack is charged. The method further includes a step of identifying the power supply status, and if it is identified that an external power source is connected to the input interface, identifying that the power supply status is power supply from the external power source, and if it is identified that an external power source is not connected to the input interface and there is electricity in the built-in battery, identifying that the power supply status is power supply from the built-in battery.

[0256] The power supply status is compared with the electricity usage demand to determine whether or not current conversion processing is necessary. If current conversion processing is necessary, the current conversion processing is performed and a charging current that matches the electricity usage demand is discharged to the battery pack. If current conversion processing is not necessary, the charging current is directly discharged to the battery pack.

[0257] The method is: if identifying that the load is connected to the energy storage device, identifying that the electrical usage demand is to power the load; The method further includes a step of identifying a power supply state, and if it is identified that an external power source is connected to the input interface, identifying that the power supply state is power supply from the external power source, and if it is identified that an external power source is not connected to the input interface and there is a charge in the built-in battery, identifying that the power supply state is power supply from the built-in battery; if it is identified that the battery pack is connected to the energy storage device, identifying that the battery pack may be used as a power source; The method further includes a step of controlling the internal battery and the battery pack so that, when it is identified that the power supply situation is power supply from the internal battery and the battery pack, the internal battery and the battery pack are connected in parallel to discharge a discharge current and supply power to the load.

[0258] The method further includes a step of comparing the discharge power of the built-in battery and the battery pack with the electrical demand of the load to determine whether the built-in battery and the battery pack need to be connected in parallel, and if the discharge power of the built-in battery cannot meet the electrical demand of the load, a step of connecting the built-in battery and the battery pack in parallel to release a discharge current and supply power to the load.

[0259] The method further includes a step of comparing the power supply status with the electricity usage demand, determining whether a current change process is necessary, and if a current conversion process is necessary, processing the discharge current into a discharge current that matches the electricity usage demand and supplying power to the load.

[0260] The method further includes identifying a switch of the power source, comparing the new power source with real-time electricity usage demand, and sending new control instructions to perform charging control and / or discharging control.

[0261] Those skilled in the art should understand that the embodiments of the present application shown in the above description and drawings are merely examples and do not limit the present application. The objectives of the present application are fully and effectively achieved. The function and structural principle of the present application are shown and explained in the embodiments, and without departing from the principles, the embodiments of the present application can be arbitrarily modified or modified, and different embodiments can be combined.

Claims

1. an energy storage power source; and a battery pack removably connected to the energy storage power source; The energy storage power source includes: a housing in which an attachment portion including an interface is disposed, a built-in battery and an inverter that are respectively provided within the housing and do not interfere with the attachment portion; an input interface and an output interface, each of which is provided on the housing and can be used by a user to contact the input interface and the output interface, the battery pack is detachably connected to the mounting portion and includes a power output port mechanically and electrically connectable to the interface; the battery pack has at least two different operating states when disposed in the energy storage power source; In the first working state, the battery pack is charged by power from one end of the energy storage power source via a mechanical and electrical connection between the power output port and the interface; In the second working state, The battery pack is coupled to the built-in battery and the inverter through mechanical and electrical connections between the power output port and the interface, and further outputs an AC current through the output interface.

1. An energy storage device comprising:

2. The battery pack includes at least two charging methods; In a charging method 1, when an external power source for charging is connected to the input interface, the battery pack receives power from the external power source for charging through a mechanical and electrical connection between the power output port and the interface; In a charging method 2, when an external power source for charging is not connected to the input interface, the battery pack receives power from the built-in battery for charging through a mechanical and electrical connection between the power output port and the interface; 2. The energy storage device of claim 1 .

3. When an external power source for charging is connected to the input interface, one of the battery pack and the built-in battery receives power preferentially and is charged, and when charging of one of the battery pack and the built-in battery is completed, the other of the battery pack and the built-in battery receives power and is charged.

3. The energy storage device according to claim 1 or 2.

4. and a control key configured to select and control whether the battery pack is coupled to the inverter.

2. The energy storage device of claim 1 .

5. When the control key controls the battery pack so that the battery pack is not coupled to the inverter, the built-in battery charges the battery pack and simultaneously outputs power to the battery pack and the inverter, so that the inverter outputs AC current.

5. The energy storage device of claim 4.

6. When the control key controls the battery pack to be coupled to the inverter, the battery pack outputs power to the inverter such that the inverter outputs an AC current.

5. The energy storage device of claim 4.

7. When the battery pack and the internal battery are respectively coupled to the inverter, the internal battery preferentially outputs power to the inverter so that the inverter outputs AC current; When the voltage of the built-in battery drops to a low-voltage protection threshold, the battery pack switches a power supply source from the built-in battery to the battery pack so as to output power to the inverter so that the inverter outputs an AC current.

2. The energy storage device of claim 1 .

8. 1. An energy storage device, comprising: An energy storage power source including an internal battery, a power transmitter, a housing to which the internal battery and the power transmitter are attached, and a battery pack; The power transmitter is connected to an external power source and supplies power to the energy storage device, the built-in battery is circuit-connected to the power transmitter and is charged and discharged by the power transmitter, and the power transmitter is connected to a load and supplies power to the load; the battery pack is removably attached to the housing and in circuit with the power transmitter and is charged by the energy storage power source, and when both the internal battery and the battery pack need to be charged, the battery pack is charged preferentially over the internal battery; 1. An energy storage device comprising:

9. When the power transmitter is connected to an external power source, the energy storage device is in a charging state, and it is detected that both the built-in battery and the battery pack need to be charged, the power transmitter preferentially converts the power of the external power source into a second charging current, and after completing the charging of the battery pack, converts the power of the external power source into a first charging current to charge the built-in battery.

9. The energy storage device of claim 8.

10. When two or more battery packs need to be charged, completing the charging of the two or more battery packs in sequence according to a charging order from a battery pack with a low amount of electricity to a battery pack with a high amount of electricity.

10. The energy storage device of claim 9.

11. When two or more battery packs need to be charged, completing the charging of the two or more battery packs in sequence according to a charging order from the battery pack with a higher amount of electricity to the battery pack with a lower amount of electricity.

10. The energy storage device of claim 9.

12. If more than one battery pack needs to be charged, charge all of the battery packs simultaneously until charging of each battery pack is completed.

10. The energy storage device of claim 9.

13. If more than one battery pack needs to be charged, charging all the battery packs alternately until each battery pack is fully charged.

10. The energy storage device of claim 9.

14. When the power transmitter is not connected to an external power source and the energy storage device is in a non-charging state, providing a discharge current by the built-in battery to power a connected load; The battery pack is connected to a circuit of the energy storage device, and the built-in battery and the battery pack are connected in parallel to supply power to a load.

9. The energy storage device of claim 8.

15. a parallel control key is provided, the battery pack is circuit-connected to the power transmitter and to the parallel control key; the parallel control key is operated to control the corresponding battery pack to be connected in parallel to the built-in battery; 15. The energy storage device of claim 14.

16. After the battery pack and the built-in battery are connected in parallel, the built-in battery first releases a current, which is converted into a discharge current by the power transmitter and then supplied to a load; until the discharge of the built-in battery is completed, the discharge target is switched from the built-in battery to the battery pack so that the battery pack discharges, which is converted into the discharge current by the power transmitter and then supplied to a load, thereby extending the discharge time of the energy storage device; 16. Energy storage device according to claim 14 or 15.

17. When the internal battery is discharged until the voltage becomes zero, the discharge target is switched from the internal battery to the battery pack so that the discharge of the internal battery is completed and the battery pack begins to discharge.

17. The energy storage device of claim 16.

18. When the internal battery discharges until the voltage becomes lower than a first low voltage threshold, the internal battery completes discharging, enters a low voltage protection state, and switches the discharge target from the internal battery to the battery pack so that the battery pack discharges.

17. The energy storage device of claim 16.

19. After the battery pack and the built-in battery are connected in parallel, first, the one of the battery pack and the built-in battery, which has a higher voltage, discharges, and when the battery pack and the built-in battery reach a voltage equalization state, both the battery pack and the built-in battery discharge, which is converted into a discharge current by the power transmitter and supplied to a load.

16. Energy storage device according to claim 14 or 15.

20. After the battery pack and the built-in battery are connected in parallel, they are discharged together, and the discharge current is converted by the power transmitter and supplied to the load. After the battery pack discharges below a second low-voltage threshold, it stops discharging and enters a low-voltage protection state. After the built-in battery discharges below a first low-voltage threshold, it stops discharging and enters a low-voltage protection state.

17. The energy storage device of claim 16.

21. A charge / discharge control system for controlling charging and discharging of an energy storage device, a detection unit connected to the circuit of the energy storage device to detect electrical information of each device connected to the circuit, to detect whether the energy storage device is connected to a battery pack, and to detect electrical information of the battery pack; an identification unit communicatively connected to the detection unit, for identifying a power source and an electrical usage demand of the energy storage device based on electrical information detected by the detection unit; a comparison unit communicatively connected to the identification unit, for comparing the power supply source and the electricity usage demand, and generating a corresponding charge control command and / or discharge control command, wherein when the electricity usage demand is to charge the built-in battery of the energy storage device and the connected battery pack, the charge control command generated by the comparison unit is to charge the battery pack preferentially, and charge the built-in battery after completing charging of the battery pack; a charging unit circuit-connected to the comparison unit for executing the charging control command; A charge / discharge control system comprising:

22. The charging control instructions generated by the comparison unit further include instructions to charge two or more of the battery packs connected to the energy storage device according to a preset battery pack charging priority.

22. The charge / discharge control system according to claim 21 .

23. The detection unit detects that a power transmitter is connected to a load; The identification unit identifies that the electricity usage demand is power supply to a load; The comparison unit compares the electricity usage demand according to the power supply source identified by the identification unit, and generates a discharge control command; The charge / discharge control system further includes a discharge unit communicatively connected to the comparison unit and configured to execute the discharge control command to control the energy storage device to output a discharge current to power a load.

22. The charge / discharge control system according to claim 21 .

24. When the detection unit detects that the battery pack is connected to a load, and the identification unit identifies that a power supply source is capable of supplying power to the built-in battery and the battery pack, the discharge control command generated by the comparison unit is a command to connect the built-in battery and the battery pack in parallel, and output a discharge current in parallel to supply power to a load.

24. The charge / discharge control system according to claim 23.

25. The detection unit detects that the battery pack is connected to the energy storage device, i.e., when the battery pack is identified as a power supply by the identification unit, it can be connected in parallel with the built-in battery.

25. The charge / discharge control system according to claim 24.

26. When the detection unit detects that a parallel control key of the energy storage device is triggered, and the identification unit identifies that the battery pack controlled by the parallel control key is the power supply, the battery pack can be connected in parallel with the built-in battery.

25. The charge / discharge control system according to claim 24.

27. The discharge control command further includes a parallel output method of the battery pack and the built-in battery; The parallel output method is to switch the discharge unit so that the built-in battery is discharged first, and the battery pack connected in parallel is discharged after the built-in battery is completely discharged.

27. The charge / discharge control system according to claim 25 or 26.

28. When the detection unit detects that the internal battery is discharged to zero voltage, the discharge unit is switched so that the internal battery is discharged to complete and the battery pack is discharged.

28. The charge / discharge control system according to claim 27.

29. When the detection unit detects that the internal battery is discharging until the voltage is lower than a first low-voltage threshold, the discharge of the internal battery is completed and the discharge unit is switched to discharge the battery pack.

28. The charge / discharge control system according to claim 27.

30. When the detection unit detects that the voltage of the battery pack is lower than a second low-voltage threshold, the discharge unit stops discharging the battery pack.

30. The charge / discharge control system according to claim 29.

31. The discharge control command further includes a parallel output method of the battery pack and the built-in battery; The parallel output method is such that either the built-in battery or the battery pack, whichever has a higher voltage, is discharged first, and after the voltages of the built-in battery and the battery pack are equalized, both the built-in battery and the battery pack are discharged.

27. The charge / discharge control system according to claim 25 or 26.

32. When the identification unit identifies two or more of the battery packs as the power supply source, the battery packs can be connected in parallel with the built-in battery; The discharge control command generated by the comparison unit further includes a command to control discharging two or more battery packs according to a preset battery pack discharge sequence after the battery pack is switched to discharge.

28. The charge / discharge control system according to claim 27.

33. The discharge sequence of the battery packs is preset so as to sequentially control each of the battery packs connected in parallel to be discharged in accordance with a discharge sequence from high voltage to low voltage.

33. The charge / discharge control system according to claim 32.

34. The discharge sequence of the battery packs is preset so as to sequentially control each of the battery packs connected in parallel to be discharged in accordance with a discharge sequence from low voltage to high voltage.

33. The charge / discharge control system according to claim 32.

35. The discharge sequence of the battery packs is preset so that the battery pack with a higher voltage is discharged first, and then the voltages of the battery packs with lower voltages are equalized and then discharged together, and the voltages of the battery packs connected in parallel are equalized and then discharged together. The charge / discharge control system according to claim 32.

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