Energy storage device, control method thereof, bidirectional conversion device, control method thereof, power supply device

Abstract

The application provides an energy storage device, a control method thereof, a bidirectional conversion device, a control method thereof, and a power supply device. The control method of the energy storage device acquires a working state of the bidirectional conversion device when the energy storage device is electrically connected with the bidirectional conversion device, sends a reset instruction to the bidirectional conversion device to instruct the bidirectional conversion device to rehandshake with a target device to redetermine the working state of the bidirectional conversion device when the working state is a charging state, and acquires electric energy from the target device through the bidirectional conversion device for charging or provides electric energy to the target device through the bidirectional conversion device in response to the redetermined working state of the bidirectional conversion device. The control method of the energy storage device can prevent the target device from charging the energy storage device through the bidirectional conversion device.

Description

Technical Field

[0001] This application relates to the field of power technology, specifically to an energy storage device and its control method, a bidirectional conversion device and its control method, and a power supply device. Background Technology

[0002] In related technologies, when a bidirectional converter electrically connects an energy storage device and a target device, the target device's electrical energy can be used to charge the energy storage device via the bidirectional converter, or the energy storage device's electrical energy can be used to supply the target device via the bidirectional converter. However, in scenarios where the bidirectional converter is first connected to the target device and then to the energy storage device, sometimes the target device needs to be charged, but it is charging the energy storage device in reverse, affecting the user experience. Summary of the Invention

[0003] In view of this, this application provides an energy storage device and its control method, a bidirectional conversion device and its control method, and a power supply device, which can prevent the target device from recharging the energy storage device through the bidirectional conversion device.

[0004] The first aspect of this application provides a control method for an energy storage device, applied to the energy storage device, comprising: when the energy storage device is electrically connected to a bidirectional converter, acquiring the operating state of the bidirectional converter; when the operating state is a charging state, sending a reset command to the bidirectional converter; wherein, when the bidirectional converter is in the charging state, the bidirectional converter is used to obtain electrical energy from the connected target device to charge the energy storage device; the reset command is used to instruct the bidirectional converter and the target device to re-handshake to redetermine the operating state of the bidirectional converter; in response to the redetermined operating state of the bidirectional converter, obtaining electrical energy from the target device through the bidirectional converter for charging, or providing electrical energy to the target device through the bidirectional converter.

[0005] In the control method of this application, when the energy storage device is electrically connected to the bidirectional converter, the operating status of the bidirectional converter is first obtained. If the operating status of the bidirectional converter is charging, it means that the bidirectional converter is outputting electrical energy from the target device. When the energy storage device is connected to the bidirectional converter, the target device will supply power to the energy storage device through the bidirectional converter. If the target device is a device that needs to obtain electrical energy, it may reverse charge the energy storage device, causing the target device to be unable to obtain electrical energy due to reverse charging, further consuming the target device's remaining electrical energy, and even potentially damaging the target device due to over-discharge. Therefore, when the operating status of the bidirectional converter is charging, the energy storage device actively sends a reset command to the bidirectional converter, instructing the bidirectional converter and the target device to re-handshake to redetermine the operating status of the bidirectional converter, ensuring that the re-determined operating status of the bidirectional converter meets the needs of both the energy storage device and the target device. Then, in response to the re-determined operating status of the bidirectional converter, the energy storage device obtains electrical energy from the target device for charging through the bidirectional converter, or provides electrical energy to the target device through the bidirectional converter. Therefore, the control method of the energy storage device in this application can ensure that the energy storage device, the bidirectional conversion device, and the target device transmit electrical energy normally as expected, and prevent the target device from reversing and charging the energy storage device through the bidirectional conversion device.

[0006] In some embodiments, the reset instruction is used to instruct the bidirectional converter to reset its operating state in order to re-handshake with the target device to determine the operating state of the bidirectional converter; or, the reset instruction is used to instruct the bidirectional converter to re-handshake with the target device to determine a new operating state in order to update the current operating state.

[0007] A second aspect of this application provides a control method for a bidirectional converter, applied to the bidirectional converter, comprising: establishing an electrical connection with an energy storage device; sending the operating status of the bidirectional converter to the energy storage device; upon receiving a reset command sent by the energy storage device, re-handshaking with the connected target device to re-determine the operating status of the bidirectional converter; and obtaining electrical energy from the target device to charge the energy storage device, or obtaining electrical energy from the energy storage device to supply power to the target device, based on the re-determined operating status.

[0008] The control method for the bidirectional converter in this application sends the operating status of the bidirectional converter to the energy storage device when the bidirectional converter is electrically connected to the energy storage device. Subsequently, upon receiving a reset command from the energy storage device, the bidirectional converter and the connected target device will re-handshake to re-determine the operating status of the bidirectional converter. This design takes into account that if the bidirectional converter is in a charging state before the re-handshake, it means that the bidirectional converter is outputting electrical energy from the target device. If the bidirectional converter is connected to the energy storage device at this time, the target device will supply power to the energy storage device through the bidirectional converter. If the target device is a device that needs to obtain electrical energy, there is a possibility that the target device may reverse charge the energy storage device, causing the target device to be unable to obtain electrical energy due to reverse charging, further consuming the target device's remaining electrical energy, and potentially even damaging the target device due to over-discharge. If the bidirectional converter receives a reset command from the energy storage device, it can redetermine its operating state to meet the needs of both the energy storage device and the target device. Then, based on the redefined operating state, it can transfer electrical energy from the target device to the energy storage device for charging, or transfer electrical energy from the energy storage device to the target device. Therefore, the control method for the bidirectional converter in this application can control the bidirectional converter to be in a suitable operating state, ensuring that electrical energy is transferred normally between the energy storage device, the bidirectional converter, and the target device as expected, and preventing the target device from reverse-charging the energy storage device through the bidirectional converter.

[0009] In some embodiments, re-handshaking with the accessed target device to re-determine the operating state of the bidirectional converter includes: when electrically connected to the energy storage device and the target device is a bidirectional charging and discharging device, determining the operating state of the bidirectional converter to be a discharging state; wherein, when the bidirectional converter is in the discharging state, the bidirectional converter is used to obtain electrical energy from the energy storage device to supply power to the target device.

[0010] A third aspect of this application provides a control method for a bidirectional converter, applied to the bidirectional converter, comprising: establishing an electrical connection with an energy storage device; acquiring the operating state of the bidirectional converter; when the operating state is a charging state, re-handshaking with the connected target device to re-determine the operating state of the bidirectional converter; wherein, when the bidirectional converter is in a charging state, the bidirectional converter is used to obtain electrical energy from the connected target device to charge the energy storage device; and according to the re-determined operating state, obtaining electrical energy from the target device to charge the energy storage device, or obtaining electrical energy from the energy storage device to supply power to the target device.

[0011] The control method for the bidirectional converter in this application acquires the operating state of the bidirectional converter when it is electrically connected to the energy storage device. If the operating state of the bidirectional converter is charging, it means that the bidirectional converter is outputting electrical energy from the target device. When the bidirectional converter is connected to the energy storage device, the target device will supply power to the energy storage device through the bidirectional converter. If the target device requires electrical energy, it may reverse charge the energy storage device, causing the target device to be unable to obtain electrical energy due to reverse charging, further consuming its remaining electrical energy, and potentially even damaging the target device due to over-discharge. Therefore, when the bidirectional converter is in charging mode, the bidirectional converter and the target device re-handshake to re-determine the operating state of the bidirectional converter, ensuring that the operating state of the bidirectional converter meets the needs of both the energy storage device and the target device. Then, based on the re-determined operating state, the bidirectional converter transfers the electrical energy obtained from the target device to the energy storage device for charging, or transfers the electrical energy obtained from the energy storage device to the target device. Therefore, the control method of the bidirectional converter in this application can control the bidirectional converter to work in a suitable working state, ensuring that the energy storage device, the bidirectional converter, and the target device transmit electrical energy normally as expected, and preventing the target device from reversing and charging the energy storage device through the bidirectional converter.

[0012] In some embodiments, re-handshaking with the accessed target device to re-determine the operating state of the bidirectional converter includes: when electrically connected to the energy storage device and the target device is a bidirectional charging and discharging device, determining the operating state of the bidirectional converter as a discharge state; wherein, when the bidirectional converter is in a discharge state, the bidirectional converter is used to obtain electrical energy from the energy storage device to supply power to the target device.

[0013] The fourth aspect of this application provides an energy storage device, including a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it causes the energy storage device to implement the control method of the energy storage device described in the first aspect or any embodiment of the first aspect.

[0014] The fifth aspect of this application provides a bidirectional conversion device, including a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it causes the bidirectional conversion device to implement the control method of the bidirectional conversion device described in the second aspect or the embodiments of the second aspect, or to implement the control method of the bidirectional conversion device described in the third aspect or the embodiments of the third aspect.

[0015] In some embodiments, the bidirectional conversion device includes a telescopic cable module, which is used to electrically connect to the target device through the adjustable-length connector terminal in the telescopic cable module; or, the bidirectional conversion device includes a wireless charging / discharging module, which is used to couple to the target device.

[0016] The sixth aspect of this application provides a power supply device, which includes the energy storage device described in the fourth aspect, and the bidirectional conversion device described in the fifth aspect or an embodiment of the fifth aspect; the energy storage device and the bidirectional conversion device are electrically connected in a detachable manner. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection between the energy storage device and the bidirectional conversion device provided in the embodiments of this application.

[0018] Figure 2 This is another connection diagram of the energy storage device provided in the embodiments of this application.

[0019] Figure 3 This is a schematic diagram of the structure of an energy storage device provided in one embodiment of this application.

[0020] Figure 4 This is a schematic diagram of a bidirectional conversion device provided in an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of an energy storage device provided in an embodiment of this application being electrically connected to a target device via a bidirectional converter.

[0022] Figure 6 This is a flowchart of a control method for an energy storage device provided in an embodiment of this application.

[0023] Figure 7 This is a flowchart of a control method for a bidirectional converter provided in an embodiment of this application.

[0024] Figure 8 This is a flowchart of a control method for a bidirectional converter provided in another embodiment of this application.

[0025] Figure 9 This is a schematic diagram of a power supply device provided in an embodiment of this application. Detailed Implementation

[0026] It should be noted that the terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0027] It should also be noted that the methods disclosed in the embodiments of this application or the methods shown in the flowcharts include one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchanged, and some steps can also be deleted.

[0028] Some embodiments will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] Figure 1 This diagram illustrates a connection between an energy storage device 100 and a bidirectional conversion device 200 provided in an embodiment of this application. Figure 1 As shown, the energy storage device 100 can be electrically connected to the target device 300 through the bidirectional converter 200, thereby obtaining electrical energy from the target device 300 for charging through the bidirectional converter 200, or discharging through the bidirectional converter 200 to provide electrical energy to the target device 300.

[0030] The energy storage device 100 and the bidirectional conversion device 200 are each set up independently. Figure 1 In the corresponding scenario, the energy storage device 100 and the bidirectional conversion device 200 can be electrically connected together in a detachable manner.

[0031] In another scenario, the energy storage device 100 can also be used independently. For example, Figure 2 This illustration shows another connection diagram of the energy storage device 100 provided in an embodiment of this application. (See diagram below.) Figure 2 As shown, the energy storage device 100 can also be directly connected to the target device 300 and directly obtain power from the target device 300 for charging, or directly provide power to the target device 300.

[0032] Figure 3 A schematic diagram of a structure of an energy storage device 100 provided in one embodiment is shown. For example... Figure 3 As shown, the energy storage device 100 includes an energy storage battery 11, a first connection interface 12, and a first control module 13. The energy storage battery 11 is electrically connected to the first connection interface 12, and the energy storage battery 11 and the first connection interface 12 are respectively electrically connected to the first control module 13. Figure 3 In the diagram, the connections between the first control module 13 and other parts are represented by dashed lines. The first connection interface 12 can be used to electrically connect the bidirectional converter 200.

[0033] Among them, the energy storage battery 11 includes a cell and a battery management system (BMS), which is used to monitor the charging and discharging status and parameters of the cell.

[0034] The first connection interface 12 can be a contact-type interface, such as a Pogopin interface (also known as a spring pin). Alternatively, the first connection interface 12 can also be other types of interfaces, such as plug-in interfaces. Plug-in interfaces include, but are not limited to, USB interfaces, spring-loaded interfaces, and pin-type interfaces, among which USB interfaces include, for example, USB Type-C interfaces. The first connection interface 12 can also be other interfaces that support bidirectional charging and discharging functions.

[0035] Energy storage device 100 can connect to target device 300 with corresponding device attributes according to actual conditions. In one scenario, the device attribute of target device 300 can be a sink device that only receives power and does not discharge, such as various household appliances and other loads. The sink device can be powered by energy storage device 100 through bidirectional conversion device.

[0036] In another scenario, the target device 300 can also be a source device that only discharges and does not receive power, such as a power adapter, photovoltaic power generation equipment, or DC generator. Therefore, the source device can be used to replenish the energy storage device 100 through a bidirectional conversion device. The power adapter can be electrically connected to a wall socket, power strip, or other external power source.

[0037] In another scenario, the target device 300 can be a bidirectional charging / discharging device. A bidirectional charging / discharging device supports bidirectional charging and discharging functionality; therefore, it is a dual-role port device, capable of functioning as both a source and a receiver. Examples of bidirectional charging / discharging devices include user terminal devices with built-in rechargeable batteries (such as mobile phones, tablets, and laptops), energy storage converters, and independent battery devices. The energy storage device 100 can be used to charge the bidirectional charging / discharging device via the bidirectional converter, and can also be charged by the bidirectional charging / discharging device via the bidirectional converter.

[0038] In some embodiments, a switching device (not shown in the figure) may be provided on the connection line between the energy storage battery 11 and the first connection interface 12. By controlling the switching state of the switching device, the connection state between the energy storage battery 11 and the first connection interface 12 can be controlled.

[0039] In some embodiments, a power conversion circuit (not shown in the figure) capable of bidirectional power conversion can be provided on the connection line between the first connection interface 12 and the energy storage battery 11 to convert the power of the energy storage battery 11 and output it to the first connection interface 12, or to convert the input power of the first connection interface 12 to charge the energy storage battery 11.

[0040] The first control module 13 is used to control the operation of the BMS in the energy storage battery 11, control the switching status of the switching devices on the circuit, and monitor the connection status of the first connection interface 12. The first control module 13 may include a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it enables the energy storage device 100 to implement its control algorithm. For ease of distinction, the processor in the first control module 13 may be referred to as the first processor 131, and the memory in the first control module 13 may be referred to as the first memory 132.

[0041] The first processor 131 includes, for example, a microcontroller (MCU), a digital signal processor (DSP), or other general-purpose processor.

[0042] The first memory 132 may be, for example, a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed discs, laser discs, optical discs, digital universal discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer.

[0043] Figure 4 A schematic diagram of the structure of a bidirectional conversion device 200 provided in one embodiment is shown.

[0044] like Figure 4 As shown in Figure (a), the bidirectional converter 200 includes a second connection interface 21, a power conversion circuit 22, a telescopic cable module 23, and a second control module 25. The second connection interface 21 is electrically connected to the first end of the power conversion circuit 22, and the second end of the power conversion circuit 22 is electrically connected to the telescopic cable module 23. The power conversion circuit 22, the second connection interface 21, and the telescopic cable module 23 are all electrically connected to the second control module 25. Figure 4In the diagram, the connections between the second control module 25 and other parts are indicated by dashed lines. The second connection interface 21 can be used to electrically connect to the energy storage device 100, and the telescopic cable module 23 can be used to electrically connect to the target device 300.

[0045] The second connection interface 21 is of the same type as the first connection interface 12, so it can be referred to the first connection interface 12 mentioned above, and will not be repeated here. The second connection interface 21 is compatible with the first connection interface 12, and the second connection interface 21 is used for electrical connection with the first connection interface 12. When the second connection interface 21 is electrically connected to the first connection interface 12, the bidirectional conversion device 200 and the energy storage device 100 are electrically connected, that is, the energy storage battery of the energy storage device 100, the first connection interface 12, the second connection interface 21, and the power conversion circuit 22 are electrically connected in sequence.

[0046] The power conversion circuit 22 is a bidirectional conversion circuit. The power conversion circuit 22 can be used to transfer electrical energy from the second terminal of the power conversion circuit 22 to the first terminal of the power conversion circuit 22, and can also be used to transfer electrical energy from the first terminal of the power conversion circuit 22 to the second terminal of the power conversion circuit 22.

[0047] The power conversion circuit 22 may include a bidirectional DC-DC converter and a bidirectional DC-AC converter. The bidirectional DC-DC converter may include, for example, a four-switch buck-boost circuit, a dual active bridge (DAB) converter, or an LLC resonant converter. The bidirectional DC-AC converter may include, for example, a single-phase full-bridge inverter circuit.

[0048] The retractable cable module 23 includes an adjustable-length connecting cable 231, one end of which has a connecting terminal 232. The connecting terminal 232 can be, for example, a USB Type-C plug, a Lightning plug, etc. The interface of the target device 300 can mate with the connecting terminal 232. In some scenarios, refer to... Figure 5 Figure (a) and Figure 5 In Figure (b), the connecting line 231 can be stretched out to form the bidirectional conversion device 200. The bidirectional conversion device 200 can be electrically connected to the energy storage device 100 through the second connecting interface 21, and simultaneously wiredly connected to the interface of the target device 300 through the connecting line 231 of the telescopic line module 23. Figure 5 The target device in Figure (a) is shown as a power adapter. Figure 5The target device in Figure (a) is shown as a mobile phone. When the connecting cable 231 is not needed, it can also be retracted and accommodated in the bidirectional converter 200.

[0049] In some embodiments, such as Figure 4 As shown in Figure (b), the telescopic cable module 23 can also be replaced by the charge / discharge interface 24. The bidirectional converter 200 is used to electrically connect the target device 300 via the charge / discharge interface 24.

[0050] The charging / discharging interface 24 may include a USB Type-C interface, a Lightning interface, or other interfaces that support bidirectional charging / discharging. In some embodiments, the charging / discharging interface 24 of the bidirectional converter 200 has a built-in connecting cable, and the interface of the target device 300 can be connected to the charging / discharging interface 24. In some embodiments, the charging / discharging interface 24 is connected to the interface of the target device 300 via an external connecting cable. In one scenario, the bidirectional converter 200 can be electrically connected to the energy storage device 100 via the second connecting interface 21, and simultaneously establish a wired connection with the interface of the target device 300 via a cable connected to the charging / discharging interface 24.

[0051] In some embodiments, the charging / discharging interface 24 may further include a plug terminal (not shown in the figure). In one scenario, the plug terminal may protrude from the bidirectional converter 200, which can be electrically connected to the energy storage device 100 via the second connection interface 21, and can also be directly connected to a wall socket, power strip, or other external power source via the plug terminal. When the plug terminal is not needed, it can also be retracted into the bidirectional converter 200.

[0052] The connection terminal of the telescopic line module in the bidirectional converter or the charging / discharging interface in the bidirectional converter can be referred to as the target interface.

[0053] In some embodiments, such as Figure 4 As shown in Figure (c), the telescopic cable module 23 can also be replaced by the wireless charging / discharging module 26. The bidirectional converter 200 is used to couple and connect to the target device 300 via the wireless charging / discharging module.

[0054] The wireless charging / discharging module 26 may include, for example, a wireless charging / discharging coil for generating an electromagnetic field, or an electrode plate for generating an electric field. In one scenario, referencing... Figure 5In Figure (c), the target device 300 is a wireless charging / discharging device containing a wireless charging / discharging coil or an electrode plate. The bidirectional conversion device 200 can be attached to or close to the target device 300, and generate an electromagnetic field with the wireless charging / discharging coil in the wireless charging / discharging module 26 and the wireless charging / discharging coil in the target device 300, or generate an electric field with the electrode plate in the wireless charging / discharging module 26 and the electrode plate in the target device 300, thereby establishing a coupling connection and transmitting electrical energy with the target device 300 through the electromagnetic field or the electric field.

[0055] In some other embodiments, the bidirectional converter 200 may also be provided with at least two of the following: a telescopic cable module 23, a charging / discharging interface 24, and a wireless charging / discharging module 26.

[0056] In some embodiments, Figure 4 The bidirectional converter 200 in Figures (a) to (c) may further include a wireless transceiver module (not shown). The wireless transceiver module may be, for example, a Bluetooth module, a ZigBee module, a Wi-Fi module, a Starlight module, or other wireless communication modules. The wireless transceiver module is electrically connected to the second control module 25. Therefore, the second control module 25 can establish a wireless communication connection with the target device 300 and the second control module 25 through the wireless transceiver module.

[0057] In some embodiments, switching devices (not shown in the figure) can be installed on the lines of the power conversion circuit 22 and the second connection interface 21, the retractable cable module 23, the charging and discharging interface 24, and the wireless charging and discharging module 26. By controlling the switching state of the switching devices, the connection state between the power conversion circuit 22 and the second connection interface 21, the retractable cable module 23, the charging and discharging interface 24, and the wireless charging and discharging module 26 can be controlled.

[0058] The second control module 25 is used to control the operation of the power conversion circuit 22, the wireless charging / discharging module 26, or the wireless transceiver module, control the switching status of the switching devices on the line, and monitor the connection status of the second connection interface 21, the connection terminal 232 of the retractable cable module 23, or the charging / discharging interface 24. The second control module 25 may include a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it enables the bidirectional conversion device 200 to implement its control algorithm. For ease of distinction, the processor in the second control module 25 can be referred to as the second processor 251, and the memory in the second control module 25 can be referred to as the second memory 252. The types of the second processor 251 and the second memory 252 can be referenced to the aforementioned first processor 131 and first memory 132, and will not be repeated here.

[0059] In some embodiments, the second processor 251 integrates a power management chip (also known as a power IC), a protocol chip, etc., which can realize power conversion control of the power conversion circuit 22, and realize communication between the bidirectional conversion device 200 and the target device 300 in accordance with the communication method specified in the charging protocol to negotiate suitable charging parameters, and transmit power according to the suitable charging parameters.

[0060] Understandably, the protocol chip can support at least one charging protocol. This application does not limit the types of charging protocols supported by the protocol chip. For example, the charging protocols supported by the protocol chip include wired charging protocols and wireless charging protocols. When the target device is a wireless charging / discharging device, the target device and the bidirectional converter transfer power based on the wireless charging protocol; when the target device is a wired charging / discharging device, the target device and the bidirectional converter communicate and transfer power based on the wired charging protocol.

[0061] In some embodiments, the energy storage device 100 is also available for standalone use without being connected to the target device via a bidirectional conversion device. In this scenario, the energy storage device 100 further includes a power conversion circuit and a charging / discharging interface. The energy storage device 100 is directly electrically connected to the target device 300 via the charging / discharging interface, in which case the electrical energy of the energy storage device 100 can be directly output to the target device 300. Alternatively, the electrical energy of the target device 300 can directly charge the energy storage device 100.

[0062] In a scenario where the energy storage device 100 and the bidirectional converter 200 are used together, the first connection interface 12 of the energy storage device 100 is electrically connected to the second connection interface 21 of the bidirectional converter 200. At the same time, the bidirectional converter 200 can be electrically connected to the target device 300 through the connection terminal 232 in the telescopic cable module 23, or through the charging and discharging interface 24, or through the wireless charging and discharging module 26.

[0063] At this time, the electrical energy of the energy storage device 100 can be transmitted to the first terminal of the power conversion circuit 22 through the first connection interface 12 and the second connection interface 21. The power conversion circuit 22 then converts the electrical energy and outputs it to the target device 300 through the telescopic cable module 23, the charging and discharging interface 24, or the wireless charging and discharging module 26. The working state of the bidirectional conversion device 200 at this time can be called the discharge state.

[0064] Alternatively, the electrical energy of the target device 300 can be transmitted to the second terminal of the power conversion circuit 22 via the telescopic cable module 23, the charging / discharging interface 24, or the wireless charging / discharging module 26, and then transmitted to the energy storage device 100 for charging via the second connection interface 21 and the first connection interface 12. The operating state of the bidirectional conversion device 200 at this time can be referred to as the charging state.

[0065] Understandably, the bidirectional converter 200 being in a charging or discharging state indicates its operational status, but does not necessarily mean that the energy storage device 100 or the target device 300 has received electrical energy for charging. Whether the energy storage device 100 or the target device 300 has received electrical energy depends on the connectivity of the power transmission path. For example, when the bidirectional converter 200 first connects to the target device 300 and negotiates to determine its operating state as charging, since the energy storage device 100 has not yet been connected, the bidirectional converter 200 does not receive electrical energy from the target device 300 to charge the energy storage device 100. For example, when a switching device is provided on the connection line between the first connection interface of the energy storage device 100 and the energy storage battery 11, and the switching device is not closed, although the bidirectional converter 200 is in a charging state, the power transmission path is disconnected, and the electrical energy from the target device 300 is not actually transmitted to the energy storage device 100 for charging.

[0066] In scenarios where energy storage device 100 and bidirectional converter 200 are used together, users typically first install the bidirectional converter 200 onto energy storage device 100, and then connect the bidirectional converter 200 to the target device 300. However, sometimes users connect the bidirectional converter 200 to the target device 300 first, and then install it onto energy storage device 100. When the bidirectional converter 200 is connected to the target device 300 first, if the target device 300 supports bidirectional charging and discharging, since the bidirectional converter 200 is not yet installed on energy storage device 100, it is equivalent to the bidirectional converter 200 detecting that the voltage of energy storage device 100 is 0V. At this time, the bidirectional converter 200 and the target device 300 perform a protocol handshake to determine that the bidirectional converter is in a charging state, and the target device 300 is outputting electrical energy. If the bidirectional converter 200 is then installed onto energy storage device 100, the target device 300 will charge energy storage device 100, causing the target device to charge the energy storage device in reverse.

[0067] Therefore, this application provides a control method for an energy storage device that can prevent the target device 300 from reverse charging the energy storage device 100 through the bidirectional conversion device 200.

[0068] The technical solution of this application will be further described in detail below with reference to the accompanying drawings.

[0069] Figure 6 A schematic diagram of a control method for an energy storage device according to an embodiment of this application is shown. Understandably, this control method can be applied to an energy storage device 100 and executed by a first processor 131 in the energy storage device 100.

[0070] like Figure 6 As shown, the control method for energy storage devices, applied to energy storage devices, includes: Step S11: When the energy storage device is electrically connected to the bidirectional conversion device, obtain the operating status of the bidirectional conversion device.

[0071] The first processor of the energy storage device can detect electrical signals (such as voltage or current) on the first connection interface to confirm whether it is electrically connected to the bidirectional converter. If an electrical signal is present on the first connection interface, or the magnitude of the electrical signal reaches a set threshold, or there is a change in the electrical signal, then the energy storage device is confirmed to be electrically connected to the bidirectional converter. If no electrical signal is present on the first connection interface, or the magnitude of the electrical signal does not reach the set threshold, or there is no change in the electrical signal, then the energy storage device is confirmed to be not electrically connected to the bidirectional converter.

[0072] In some embodiments, after the energy storage device and the bidirectional converter are electrically connected, the first processor can communicate with the second processor through the first connection interface and the second connection interface to obtain the operating status of the bidirectional converter from the second processor, thereby knowing whether the operating status of the bidirectional converter is charging or discharging.

[0073] In some embodiments, after confirming that the energy storage device and the bidirectional converter are electrically connected, the first processor can communicate with the second processor through a wireless transceiver module to obtain the operating status of the bidirectional converter from the second processor, thereby determining whether the operating status of the bidirectional converter is charging or discharging.

[0074] Step S12: When the operating state is charging, a reset command is sent to the bidirectional converter. When the bidirectional converter is in charging state, it obtains electrical energy from the connected target device to charge the energy storage device. The reset command instructs the bidirectional converter and the target device to re-establish their operating state.

[0075] Understandably, the bidirectional converter being in a charging or discharging state indicates its operational status, but does not necessarily mean that the energy storage device or the target device has received electrical energy for charging. Whether the energy storage device or the target device has received electrical energy depends on the connectivity of the power transmission path. For example, when the bidirectional converter first connects to the target device and negotiates to establish a charging state, since the energy storage device has not yet been connected, the bidirectional converter has not received electrical energy from the target device to charge the energy storage device. For example, when a switching device is installed on the connection line between the first connection interface 12 of the energy storage device and the energy storage battery 11, and the switching device is not closed, although the bidirectional converter is in a charging state, the power transmission path is disconnected, and the electrical energy from the target device is not actually transmitted to the energy storage device for charging.

[0076] Understandably, when an energy storage device is connected to a bidirectional converter, in the charging state, the bidirectional converter operates by obtaining electrical energy from the target device to charge the energy storage device. If the target device has a charging need, this will result in the target device's charging need not be met. Therefore, in step S12, when the bidirectional converter is in the charging state, the energy storage device actively sends a reset command to the bidirectional converter so that the bidirectional converter can re-determine a suitable operating state.

[0077] In some embodiments, the second processor of the bidirectional converter can re-handshake with the target device based on the charging protocol, through the interface of the connection line terminal or charging / discharging interface or wireless charging / discharging module and the target device.

[0078] In some embodiments, after a successful handshake, the second processor can determine the device attributes of the target device based on the specific pin voltage of the connection terminal or the charging / discharging interface or other information, identify whether the target device is a bidirectional charging / discharging device, a receiving device, or a source device, determine whether the target device is a power receiver or a power supplier, and negotiate charging parameters that meet the charging protocol requirements and charging needs.

[0079] For example, when the target device is a bidirectional charging / discharging device or a receiving device, the target device can be determined to be the receiving party; when the target device is a source device, the target device can be determined to be the supplying party. Specifically, when the target device is the receiving party, the new operating state of the bidirectional converter can be determined to be the discharging state; when the target device is the supplying party, the new operating state of the bidirectional converter can be determined to be the charging state.

[0080] In one example, assume the bidirectional converter and target device use a USB Type-C interface, and communicate based on the USB charging protocol. If the voltage on the valid CC pin of the USB Type-C interface remains at a first voltage (e.g., low voltage), the target device can be identified as a powered device. If the voltage on the valid pin of the USB Type-C interface remains at a second voltage (e.g., high voltage), different from the first voltage, the target device can be identified as a powered device. If the voltage on the valid pin of the USB Type-C interface periodically switches between the first and second voltages, and finally locks at either the first or second voltage, the target device can be identified as a bidirectional charging / discharging device.

[0081] In another example, assuming the target interface is a USB Type-C interface, the bidirectional converter and the target device communicate based on the PD protocol. Since the source device first sends a source capability message to the powered device via its CC pin, and the powered device returns a power request message carrying its power requirements to the source device based on the power supply combination provided in the source capability message, if the target device sends a source capability message, it can be confirmed that the connected target device's device attribute is a source device. If the target device sends a power request message, it can be confirmed that the connected target device's device attribute is a powered device. If the bidirectional converter and the target device also transmit a request message for role switching, it can be confirmed that the connected target device's device attribute is a bidirectional charging / discharging device.

[0082] In other embodiments, the second processor of the bidirectional converter can establish a handshake communication with the target device through a wireless transceiver module to learn about the device attributes or requirements of the target device, thereby determining whether the target device is a power receiver or a power supplier, and negotiating charging parameters that meet the charging protocol requirements and charging needs.

[0083] In other embodiments, the second processor of the bidirectional converter can determine whether the target device is a power receiver or a power supplier based on the device attributes of the target device and the electrical connection between the bidirectional converter and the energy storage device. Specifically, when the bidirectional converter and the energy storage device are electrically connected, and the target device is a bidirectional charging / discharging device or a power receiving device, the target device can be determined as a power receiver, the energy storage device as a power supplier, and the bidirectional converter operates in a discharging state. When the bidirectional converter and the energy storage device are electrically connected, and the target device is a source device, the target device can be determined as a power supplier, the energy storage device as a power receiver, and the bidirectional converter operates in a charging state.

[0084] It should be understood that the above methods for redetermining the working state of the bidirectional converter are merely examples, and can be set according to the actual situation, and are not limited to the methods mentioned in this application.

[0085] Step S13: Respond to the redefined operating state of the bidirectional converter, obtain power from the target device for charging through the bidirectional converter, or provide power to the target device through the bidirectional converter.

[0086] Understandably, after determining the new operating state of the bidirectional converter, the bidirectional converter switches to the new operating state. If the bidirectional converter switches to the charging state, the energy storage device obtains electrical energy from the target device through the bidirectional converter using negotiated charging parameters for charging. If the bidirectional converter switches to the discharging state, the energy storage device transmits electrical energy to the target device through the bidirectional converter using negotiated charging parameters.

[0087] In some embodiments, when a switching device is provided on the connection line between the first connection interface of the energy storage device and the energy storage battery, the energy storage device, in response to the redefined operating state of the bidirectional converter, closes the switching device to obtain electrical energy from the target device for charging, or to provide electrical energy to the target device through the bidirectional converter. In one implementation, the energy storage device responding to the redefined operating state of the bidirectional converter to obtain electrical energy from the target device for charging, or to provide electrical energy to the target device through the bidirectional converter, may involve the energy storage device closing the switching device provided on the connection line between the first connection interface and the energy storage battery after receiving an instruction from the bidirectional converter.

[0088] In summary, the control method for the energy storage device provided in this application, when the energy storage device is electrically connected to the bidirectional converter, first obtains the operating state of the bidirectional converter. If the operating state of the bidirectional converter is charging, it indicates that the bidirectional converter is outputting electrical energy from the target device. At this time, if the bidirectional converter is connected to the energy storage device and remains in charging state, the target device will supply power to the energy storage device through the bidirectional converter. This may cause the target device, which needs charging, to discharge externally, resulting in the target device recharging the energy storage device, further consuming the remaining power of the target device, and potentially even damaging the target device due to over-discharge. Therefore, in the method provided in this application, when the operating state of the bidirectional converter is charging, the energy storage device can actively send a reset command to the bidirectional converter, instructing the bidirectional converter and the target device to re-handshake to redetermine the operating state of the bidirectional converter. This ensures that the re-determined operating state of the bidirectional converter meets the needs of both the energy storage device and the target device. Then, in response to the re-determined operating state of the bidirectional converter, the energy storage device obtains electrical energy from the target device for charging through the bidirectional converter, or provides electrical energy to the target device through the bidirectional converter. Therefore, the control method for energy storage devices provided in this application embodiment can ensure that the energy storage device, the bidirectional conversion device, and the target device transmit electrical energy normally as expected, and prevent the target device from reversing and charging the energy storage device through the bidirectional conversion device.

[0089] Understandably, the reset command in step S12 can take many forms, and the appropriate form can be selected according to the actual scenario and requirements, as long as it can control the bidirectional converter to re-handshake with the target device to determine the working status of the bidirectional converter.

[0090] For example, in some embodiments, the reset instruction may be a reset instruction, which instructs the bidirectional converter to reset its operating state in order to re-handshake with the target device to determine the operating state of the bidirectional converter. In one implementation, after receiving the reset instruction, the second processor controls the protocol chip and power management chip to return to their initialization state to reset the operating state. In another implementation, after receiving the reset instruction, the second processor controls the entire bidirectional converter to restart to reset its operating state.

[0091] In another embodiment, the reset instruction can be an update instruction, which instructs the bidirectional converter and the target device to re-handshake to determine a new operating state in order to update the current operating state.

[0092] In yet another embodiment, the reset command can be a restart command, which instructs the bidirectional converter to restart in order to re-handshake with the target device and determine the operating state of the bidirectional converter. In one implementation, after receiving the restart command, the second processor can control the protocol chip and / or power management chip to restart in order to re-handshake and determine the operating state. In another implementation, after receiving the restart command, the second processor can control the entire bidirectional converter to restart in order to re-handshake and determine the operating state.

[0093] In addition, this application embodiment also provides a control method for a bidirectional conversion device, which can prevent the target device 300 from reverse charging the energy storage device 100 through the bidirectional conversion device 200.

[0094] The following is combined with Figure 7 and Figure 8 Two embodiments are provided to illustrate a control method for a bidirectional converter. Understandably, this control method can be applied to a bidirectional converter 200 and executed by a second processor 251 within the bidirectional converter 200.

[0095] Figure 7 A schematic diagram of a control method for a bidirectional converter according to an embodiment of this application is shown. Figure 7 As shown, the control method for the bidirectional conversion device includes: Step S21: Establish an electrical connection with the energy storage device.

[0096] When the second connection interface and the first connection interface are connected, an electrical connection is established between the bidirectional conversion device and the energy storage device.

[0097] Step S22: Send the working status of the bidirectional conversion device to the energy storage device.

[0098] For example, a bidirectional converter can determine its operating state by information characterizing its own, such as the operating state of the power conversion circuit within the converter, the connection status of the target device, and the power supply status of the target device. Alternatively, the bidirectional converter can send information characterizing its operating state to an energy storage device, which can then determine its operating state. As a further example, the second processor of the bidirectional converter can determine the direction of power transmission in the power conversion circuit by detecting electrical signals (such as current) at the first and second terminals, thereby determining the operating state of the bidirectional converter. As yet another example, the second processor can determine the direction of power transmission in the power conversion circuit based on control signals generated by the power management chip, thereby determining the operating state of the bidirectional converter. Specifically, when power is transferred from the second terminal to the first terminal of the power conversion circuit, the bidirectional converter can be determined to be in a charging state.

[0099] The second processor of the bidirectional converter can communicate with the first processor of the energy storage device via a wireless transceiver module to send the operating status of the bidirectional converter to the first processor. Upon receiving the charging status information from the bidirectional converter, the energy storage device can send a reset command to the bidirectional converter.

[0100] Step S23: Upon receiving a reset command from the energy storage device, re-handshake with the target device to re-determine the operating status of the bidirectional converter.

[0101] In other words, the bidirectional converter can be triggered by the reset command of the energy storage device to re-handshake with the target device to redetermine the working state of the bidirectional converter.

[0102] The process of re-determining the working state of the bidirectional converter and the form of the reset command can be referred to in the previous section. Figure 6 The relevant descriptions in the embodiments will not be repeated here.

[0103] Step S24: Obtain electrical energy from the target device to charge the energy storage device according to the redefined working state, or obtain electrical energy from the energy storage device to supply power to the target device.

[0104] Understandably, after determining the new operating state of the bidirectional converter, the bidirectional converter switches to the new operating state. If the bidirectional converter switches to the charging state, it obtains electrical energy from the target device and transfers the electrical energy to the energy storage device for charging. If the bidirectional converter switches to the discharging state, it obtains electrical energy from the energy storage device and transfers the electrical energy to the target device.

[0105] In summary, the control method for the bidirectional converter provided in this application sends the operating status of the bidirectional converter to the energy storage device when the bidirectional converter is electrically connected to the energy storage device. Then, upon receiving a reset command from the energy storage device, the bidirectional converter and the connected target device will re-handshake to re-determine the operating status of the bidirectional converter. This design takes into account that if the bidirectional converter is in a charging state before the re-handshake, it means that the bidirectional converter is outputting electrical energy from the target device. In this case, when the bidirectional converter is connected to the energy storage device, the target device will supply power to the energy storage device through the bidirectional converter. If the target device is a device that needs to acquire electrical energy, then the target device will reverse charge the energy storage device. The target device will not only fail to acquire electrical energy but will also further consume electrical energy, potentially leading to damage due to over-discharge. In the control method provided in this application embodiment, if the bidirectional converter receives a reset command sent by the energy storage device, it can redetermine the operating state of the bidirectional converter to meet the needs of both the energy storage device and the target device. Then, it operates according to the redetermined operating state, transferring electrical energy obtained from the target device to the energy storage device for charging, or transferring electrical energy obtained from the energy storage device to the target device. Therefore, the control method for the bidirectional converter provided in this application embodiment can control the bidirectional converter to be in a suitable operating state, ensuring that electrical energy is transferred normally between the energy storage device, the bidirectional converter, and the target device as expected, and preventing the target device from reverse-charging the energy storage device through the bidirectional converter.

[0106] Figure 8 A schematic diagram of a control method for a bidirectional converter according to another embodiment of this application is shown. Figure 8 As shown, the control method for the bidirectional conversion device includes: Step S31: Establish an electrical connection with the energy storage device.

[0107] When the second connection interface and the first connection interface are connected, an electrical connection is established between the bidirectional conversion device and the energy storage device.

[0108] Step S32: Obtain the working status of the bidirectional converter.

[0109] For example, a bidirectional converter can determine its operating state by information characterizing its operation, such as the operating state of the power conversion circuit within the converter, the connection status of the target device, and the power supply status of the target device. As a further example, the second processor of the bidirectional converter can determine the direction of power transmission in the power conversion circuit by detecting electrical signals (such as current) at the first and second terminals, thereby determining the operating state of the bidirectional converter. As yet another example, the second processor can determine the direction of power transmission in the power conversion circuit based on the control signals generated by the power management chip, thereby determining the operating state of the bidirectional converter. Specifically, when power is transmitted from the second terminal to the first terminal of the power conversion circuit, the bidirectional converter can be determined to be in a charging state.

[0110] Step S33: When the working state is charging state, re-handshake with the accessed target device to redetermine the working state of the bidirectional converter; wherein, when the bidirectional converter is in charging state, the bidirectional converter is used to obtain electrical energy from the accessed target device to charge the energy storage device.

[0111] In other words, when the bidirectional converter is in the charging state, the second processor of the bidirectional converter can actively re-handshake with the access target device to redetermine the working state of the bidirectional converter.

[0112] In some embodiments, the second processor may actively execute a preset reset mechanism to enable the bidirectional converter to re-determine a suitable operating state. The reset mechanism may be, for example, a reset mechanism, an update mechanism, or a restart mechanism, depending on the specific circumstances.

[0113] The process of re-determining the working state of the bidirectional converter can be referred to the relevant description in step S12 above, and the reset mechanism can also be referred to... Figure 6 The description of the reset instruction in the embodiment will not be repeated here.

[0114] Step S34: Obtain electrical energy from the target device to charge the energy storage device according to the redefined working state, or obtain electrical energy from the energy storage device to supply power to the target device.

[0115] Understandably, after determining the new operating state of the bidirectional converter, the bidirectional converter switches to the new operating state. If the bidirectional converter switches to the charging state, it obtains electrical energy from the target device and transfers the electrical energy to the energy storage device for charging. If the bidirectional converter switches to the discharging state, it obtains electrical energy from the energy storage device and transfers the electrical energy to the target device.

[0116] In summary, the control method for the bidirectional converter provided in this application obtains the operating state of the bidirectional converter when it is electrically connected to the energy storage device. If the operating state of the bidirectional converter is charging, it means that the bidirectional converter is outputting electrical energy from the target device. When the bidirectional converter is connected to the energy storage device, the target device will supply power to the energy storage device through the bidirectional converter. If the target device is a device that needs to acquire electrical energy, then the target device will reverse charge the energy storage device. The target device will not only fail to acquire electrical energy but will also further consume electrical energy, potentially leading to damage due to over-discharge. Therefore, in the control method provided in this application, when the operating state of the bidirectional converter is charging, the bidirectional converter can re-handshake with the target device to redetermine its operating state, ensuring that the operating state of the bidirectional converter meets the needs of both the energy storage device and the target device. Then, it operates according to the redetermined operating state, transferring electrical energy acquired from the target device to the energy storage device for charging, or transferring electrical energy acquired from the energy storage device to the target device. Therefore, the control method for the bidirectional converter provided in this application embodiment can control the bidirectional converter to work in a suitable working state, ensuring that the energy storage device, the bidirectional converter, and the target device transmit electrical energy normally as expected, and preventing the target device from reversing and charging the energy storage device through the bidirectional converter.

[0117] It should be noted that, for the sake of simplicity, the aforementioned method embodiments are described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps may be performed in other orders or simultaneously.

[0118] It is understood that this application embodiment also provides a power supply device 1000.

[0119] Please see Figure 9 The power supply device 1000 includes an energy storage device 100 and a bidirectional conversion device 200, which are electrically connected in a detachable manner. The details of the energy storage device 100 and the bidirectional conversion device 200 can be found in the descriptions in the foregoing embodiments and will not be repeated here.

[0120] In one implementation, the power supply device 1000 is a portable power supply device, also known as a split-type power bank. The power supply device 1000 can be used in power supply scenarios such as homes, outdoors, data centers, and communication base stations, which will not be listed here.

[0121] In some scenarios, such as Figure 1As shown, the energy storage device 100 and the bidirectional conversion device 200 in the power supply device 1000 can be used together.

[0122] For example, in one scenario, energy storage device 100 can be electrically connected to a user terminal device via a bidirectional converter 200. The bidirectional converter 200 obtains electrical energy from the energy storage device 100 to power the user terminal device. The user terminal device includes, but is not limited to, electronic terminal devices containing rechargeable batteries, such as mobile phones, tablets, computers, game consoles, smart wearable devices, and drones. Energy storage device 100 can perform... Figure 6 The control method shown for the energy storage device prevents the energy storage device 100 from being reverse-charged, or the bidirectional converter 200 can perform... Figure 7 or Figure 8 The control method of the bidirectional converter shown prevents the energy storage device 100 from being reverse-charged.

[0123] For example, in another scenario, the energy storage device 100 can be electrically connected to the power adapter via the bidirectional converter 200, which obtains power from the power adapter to charge the energy storage device 100.

[0124] In other scenarios, such as Figure 2 As shown, the energy storage device 100 can be used independently. In one scenario, the energy storage device 100 is directly electrically connected to the user terminal device and directly provides power to the user terminal device. In another scenario, the energy storage device 100 is directly electrically connected to the power adapter and directly obtains power from the power adapter for charging.

[0125] Understandably, the scenarios described above are merely illustrative examples provided in this application. This application does not limit the application scenarios for the power supply device 1000.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A control method of an energy storage device, applied to an energy storage device, characterized by, include: When the energy storage device is electrically connected to the bidirectional conversion device, the operating status of the bidirectional conversion device is obtained; When the working state is charging state, a reset command is sent to the bidirectional converter; wherein, when the bidirectional converter is in charging state, the bidirectional converter is used to obtain electrical energy from the accessed target device to charge the energy storage device; the reset command is used to instruct the bidirectional converter to re-handshake with the target device to redetermine the working state of the bidirectional converter. In response to the redefined operating state of the bidirectional converter, the device can either obtain electrical energy from the target device for charging or provide electrical energy to the target device through the bidirectional converter.

2. The control method according to claim 1, characterized by, The reset command is used to instruct the bidirectional converter to reset its operating state, so as to re-handshake with the target device to determine the operating state of the bidirectional converter. Alternatively, the reset command may be used to instruct the bidirectional converter to re-handshake with the target device to determine a new operating state in order to update the current operating state.

3. A control method for a bidirectional converter, applied to a bidirectional converter, characterized in that, include: Establish an electrical connection with the energy storage device; Send the operating status of the bidirectional converter to the energy storage device; Upon receiving a reset command from the energy storage device, the device re-handshakes with the target device to re-determine the operating status of the bidirectional converter. Based on the redefined operating state, power can be obtained from the target device to charge the energy storage device, or power can be obtained from the energy storage device to supply power to the target device.

4. The control method as described in claim 3, characterized in that, The re-handshake with the target device to re-determine the operating state of the bidirectional converter includes: When electrically connected to the energy storage device and the target device is a bidirectional charging and discharging device, the working state of the bidirectional converter is determined to be a discharging state; wherein, when the bidirectional converter is in the discharging state, the bidirectional converter is used to obtain electrical energy from the energy storage device to supply power to the target device.

5. A control method for a bidirectional converter, applied to a bidirectional converter, characterized in that, include: Establish an electrical connection with the energy storage device; Obtain the operating status of the bidirectional converter; When the working state is charging state, a new handshake is performed with the accessed target device to re-determine the working state of the bidirectional converter; wherein, when the bidirectional converter is in charging state, the bidirectional converter is used to obtain electrical energy from the accessed target device to charge the energy storage device; Based on the redefined operating state, power can be obtained from the target device to charge the energy storage device, or power can be obtained from the energy storage device to supply power to the target device.

6. The control method as described in claim 5, characterized in that, The re-handshake with the target device to re-determine the operating state of the bidirectional converter includes: When electrically connected to the energy storage device and the target device is a bidirectional charging and discharging device, the operating state and discharge state of the bidirectional converter are determined; wherein, when the bidirectional converter is in the discharge state, the bidirectional converter is used to obtain electrical energy from the energy storage device to supply power to the target device.

7. An energy storage device, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it causes the energy storage device to implement the control method for the energy storage device as described in any one of claims 1 to 2.

8. A bidirectional conversion device, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it causes the bidirectional converter to implement the control method of the bidirectional converter as described in any one of claims 3 to 4, or to implement the control method of the bidirectional converter as described in any one of claims 5 to 6.

9. The bidirectional conversion device as described in claim 8, characterized in that, The bidirectional conversion device includes a telescopic cable module, which is used to electrically connect to the target device via adjustable-length connecting cable terminals in the telescopic cable module; or... The bidirectional conversion device includes a wireless charging and discharging module, which is used to couple and connect with the target device through the wireless charging and discharging module.

10. A power supply device, characterized in that, The power supply device includes the energy storage device as described in claim 7, and the bidirectional conversion device as described in claim 8 or 9; The energy storage device and the bidirectional converter are electrically connected in a detachable manner.

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