Charging and discharging control method and energy storage device

Abstract

The present application is applicable to the technical field of energy storage equipment, and provides a charge and discharge control method and energy storage equipment. Among them, the above-mentioned charge and discharge control method is applied to energy storage equipment, and the energy storage equipment is used to be connected to a power supply device and a load respectively, and the charge and discharge control method includes: obtaining the rated power supply of the power supply equipment; according to the rated power supply, determining the first maximum output power of the energy storage equipment when supplying power to the load together with the power supply equipment, the first maximum output power is less than or equal to the rated power supply; when the current power demand of the load is greater than the rated power supply, according to the rated power supply, the first maximum output power and the current power demand of the load, controlling the energy storage equipment and the power supply equipment to supply power to the load together. The embodiments of the present application can improve the applicability of energy storage equipment.

Description

Technical Field

[0001] The present application belongs to the technical field of energy storage devices, and in particular relates to a charge and discharge control method and an energy storage device. Background Art

[0002] Energy storage equipment is generally composed of a bidirectional inverter and a battery pack, and has the functions of AC charging, AC discharging and uninterruptible power supply (UPS). Figure 1 As shown, when the energy storage device is connected to the power supply device through the AC input port for charging, and the load is connected to the AC output port, the power supply device can supply power to the energy storage device and the load at the same time.

[0003] As the AC output power of the energy storage device increases, the load power it can support also increases. When the energy storage device is in UPS mode, there are many limitations on the input power of the AC input port and the required power of the load, which makes the energy storage device less applicable and affects the user experience. Summary of the Invention

[0004] The embodiments of the present application provide a charge and discharge control method and an energy storage device, which can solve the problem in the related art that the use of energy storage devices requires limiting the input power of the AC input port and the required power of the load.

[0005] A first aspect of an embodiment of the present application provides a charge and discharge control method, which is applied to an energy storage device, wherein the energy storage device is used to be connected to a power supply device and a load, respectively. The charge and discharge control method includes: obtaining the rated power supply of the power supply device; determining, based on the rated power supply, a first maximum output power of the energy storage device when supplying power to the load together with the power supply device, wherein the first maximum output power is less than or equal to the rated power supply; when the current power demand of the load is greater than the rated power supply, controlling the energy storage device and the power supply device to supply power to the load together based on the rated power supply, the first maximum output power, and the current power demand of the load.

[0006] A second aspect of an embodiment of the present application provides a charge and discharge control device, which is configured on an energy storage device, and the energy storage device is used to be connected to a power supply device and a load respectively. The charge and discharge control device includes: an acquisition unit, used to obtain the rated power supply power of the power supply device; a determination unit, used to determine, based on the rated power supply power, a first maximum output power of the energy storage device when supplying power to the load together with the power supply device, the first maximum output power being less than or equal to the rated power supply power; and a control unit, used to control the energy storage device and the power supply device to supply power to the load together based on the rated power supply power, the first maximum output power and the current power demand of the load when the current power demand of the load is greater than the rated power supply power.

[0007] A third aspect of an embodiment of the present application provides an energy storage device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned charge and discharge control method when executing the computer program.

[0008] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned charge and discharge control method are implemented.

[0009] A fifth aspect of the embodiments of the present application provides a computer program product. When the computer program product is run on an energy storage device, the energy storage device executes the steps of the above-mentioned charge and discharge control method.

[0010] In an embodiment of the present application, by obtaining the rated power supply power of the power supply device, and determining the first maximum output power of the energy storage device when supplying power to the load together with the power supply device based on the rated power supply power, when the current power demand of the load is greater than the rated power supply power, the energy storage device and the power supply device are controlled to supply power to the load together based on the rated power supply power, the first maximum output power and the current power demand of the load. In the embodiment of the present application, since the first maximum output power of the energy storage device is less than or equal to the rated power supply power of the power supply device, the output power of the energy storage device when supplying power to the load together with the power supply device can be limited based on the first maximum output power, thereby avoiding the energy backflow to the power supply device exceeding the rated power supply when the load is unloaded. While ensuring the safety of the equipment, the embodiment of the present application does not need to limit the input power of the AC input port and the power demand of the load, and is therefore conducive to improving the applicability of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0012] Figure 1 This is a schematic diagram of a power supply device in the related art supplying power to a load and an energy storage device at the same time;

[0013] Figure 2 This is a schematic diagram of an implementation flow of a charge and discharge control method provided in an embodiment of the present application;

[0014] Figure 3 This is a schematic diagram of a power supply device and an energy storage device provided in an embodiment of the present application working together to supply power to a load;

[0015] Figure 4 This is a schematic diagram of a specific implementation flow of step S201 provided in an embodiment of the present application;

[0016] Figure 5 This is a schematic diagram of a 5% voltage reduction of an energy storage device provided in an embodiment of the present application;

[0017] Figure 6 This is a schematic diagram of the energy storage device provided in an embodiment of the present application with a frequency reduction of 5 Hz;

[0018] Figure 7 This is a schematic diagram of a specific implementation flow of step S203 provided in an embodiment of the present application;

[0019] Figure 8 Schematic diagram of the structure of a charge and discharge control device provided in an embodiment of the present application;

[0020] Figure 9 It is a structural diagram of the energy storage device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of this application more clear, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without making any creative work are protected by this application.

[0022] like Figure 1As shown, the energy storage device is connected to the power supply through the AC input port for charging. When a load is connected to the AC output port, the AC output port is simultaneously turned on. At this point, relays K1 and K2 are closed simultaneously. A portion (P3) of the AC input power (P1) can be used to power the load, while the remaining portion (P2) charges the energy storage device's battery. Consequently, the power supply can simultaneously power both the energy storage device and the load. In this mode (also known as UPS mode), the power demand of the load (i.e., the device connected to the AC output port) cannot exceed the input power of the AC input port.

[0023] In related technologies, as the AC output power of energy storage devices increases, the load power they can support also increases. When the energy storage device is in UPS mode, there are many limitations on the AC input power and the load power demand. The load power demand is limited only by the AC input power, making the energy storage device less suitable and affecting the user experience.

[0024] In view of this, the present application proposes a charge and discharge control method that, while ensuring the safety of the equipment, does not require limiting the input power of the AC input port and the required power of the load, thereby improving the applicability of the energy storage device.

[0025] In order to illustrate the technical solution of the present application, specific embodiments are provided below.

[0026] Figure 2 A schematic diagram of an implementation flow of a charge and discharge control method provided in an embodiment of the present application is shown. The method can be applied to energy storage devices and is suitable for situations where the applicability of energy storage devices needs to be improved.

[0027] In the embodiments of the present application, the energy storage device is used to connect to a power supply device and a load, respectively, and can support UPS mode. The power supply device is a device with power supply capabilities that is externally connected to the AC input port of the energy storage device and is used to power the load and the energy storage device. The power supply device can specifically be an oil-powered generator, a power grid, or other power supply device. The load is a device that receives electrical energy and is externally connected to the AC output port of the energy storage device. Specifically, it can be a mobile phone, camping lantern, or other electrical device.

[0028] Specifically, the above-mentioned charge and discharge control method may include the following steps S201 to S203.

[0029] Step S201: Acquire the rated power supply of the power supply device.

[0030] Specifically, the rated power supply refers to the rated power when the power supply device supplies power to the outside. In the implementation manner of the present application, the rated power supply can be input by the user or obtained by interacting with the power supply device, or it can be calculated based on the relevant information of the power supply device. For example, the energy storage device can obtain the rated power supply corresponding to the power supply device based on the device parameters of the power supply device (such as device model, device identification, etc.), or it can calculate the rated power supply of the power supply device based on the electrical parameters output by the power supply device to the power supply device (such as output current, output voltage, etc.). This application does not impose any restrictions on this.

[0031] Step S202: Determine, based on the rated power supply, a first maximum output power of the energy storage device when supplying power to a load together with the power supply device.

[0032] In the embodiment of the present application, the energy storage device can supply power to the load together with the power supply device. For example, Figure 3 As shown, the energy storage device may include a first access switch (K1), a battery pack and an inverter. The battery pack is connected to the first end of the inverter, and the second end of the inverter is connected to the power supply device through the first access switch for charge and discharge control. The second end of the inverter is also connected to the load for supplying power to the load. The first maximum output power is the maximum output power allowed by the energy storage device when the energy storage device and the power supply device supply power to the load together, and the first maximum output power is less than or equal to the rated power supply power of the power supply device. For example, the first maximum output power can be the same as the rated power supply power, or it can be 95%, 90%, 85% of the rated power supply power, etc.

[0033] Step S203 : When the current power requirement of the load is greater than the rated power supply, the energy storage device and the power supply device are controlled to supply power to the load together according to the rated power supply, the first maximum output power and the current power requirement of the load.

[0034] The load's current power demand is the power required to meet the load's normal operating requirements. If the load's current power demand exceeds the rated power supply, if the load is suddenly removed, the energy provided by the inverter, acting as a current source, cannot change suddenly. The energy previously provided to the load will be diverted to the power supply equipment, potentially damaging it. For example, if a 600W rated oil-powered generator is used as a power supply, and an energy storage device is connected to a 3600W load, the inverter must provide 3000W of output power to the load. If the load is suddenly removed, the transient 3000W of energy will be diverted to the oil-powered generator, potentially damaging it. Therefore, some related technologies impose certain requirements on the rated power supply of the power supply equipment, requiring the use of higher-power power supply equipment (for example, a rated power supply greater than twice the load's power demand). This approach places restrictions on the AC input power and the load's power demand, limiting the types of power supply equipment that can be connected to the energy storage device, thereby limiting the user experience.

[0035] In view of this, the embodiments of the present application can control the energy storage device and the power supply device to jointly supply power to the load based on the rated power supply, the first maximum output power, and the current power demand of the load when the current power demand of the load is greater than the rated power supply. Because the first maximum output power is less than or equal to the above-mentioned rated power supply, limiting the output power of the energy storage device when supplying power to the load together with the power supply device to the first maximum output power can prevent the energy backflow to the power supply device from exceeding the rated power supply when the load is unloaded. While ensuring the safety of the equipment, there is no need to limit the input power of the AC input port or the power demand of the load, which is conducive to improving the applicability of the energy storage device.

[0036] Specifically, when controlling the energy storage device and the power supply device to supply power to the load together, the power supplied by the power supply device to the load can be determined based on the rated power supply, the first maximum output power, and the current power demand of the load, and the power supplied by the energy storage device itself to the load can be determined accordingly. For example, the power supply device can supply power to the load at the full rated power supply, or at 90% of the rated power supply, and the remaining portion of the load's current power demand can be provided by the energy storage device. When the power supplied by the power supply device to the load is equal to the load's current power demand, the energy storage device may not enter current source mode.

[0037] In an embodiment of the present application, the rated power supply of the power supply device is obtained, and based on the rated power supply, the first maximum output power of the energy storage device when supplying power to the load together with the power supply device is determined. Since the first maximum output power is less than or equal to the above-mentioned rated power supply, when the current power demand of the load is greater than the rated power supply, the energy storage device and the power supply device are controlled to supply power to the load together according to the rated power supply, the first maximum output power and the current power demand of the load. The output power of the energy storage device when supplying power to the load together with the power supply device can be limited according to the first maximum output power, thereby avoiding the energy backflow to the power supply device exceeding the rated power supply when the load is unloaded. While ensuring the safety of the equipment, the embodiment of the present application does not need to limit the input power of the AC input port and the power demand of the load, which is conducive to improving the applicability of the energy storage device.

[0038] In step S201 , the energy storage device may obtain the rated power supply of the power supply device in different ways according to the working mode of the power supply device.

[0039] Specifically, such as Figure 4 As shown, in some embodiments of the present application, obtaining the rated power supply of the power supply device may include the following steps S401 to S402.

[0040] Step S401 : when it is detected that the electrical parameter of the electrical signal output by the power supply device drops to a first preset electrical parameter and remains for a first preset time period, the output voltage and output current of the power supply device are obtained.

[0041] Step S402: Determine the rated power supply according to the output voltage and the output current.

[0042] Among them, the electrical parameter can be an output voltage, an output current, an output frequency or other electrical signal parameters. It should be understood that since the power supply device can output alternating current, the output frequency is the output frequency corresponding to when the power supply device outputs alternating current. The first preset electrical parameter can be set according to actual conditions, for example, it can be set to the value when the output power of the power supply device reaches 95% of the rated power, or the difference between the value of the electrical parameter and the preset value when the output power of the power supply device reaches the rated power. The specific value of the first preset duration can be adjusted according to actual conditions, and can be set to a duration value that is convenient for the energy storage device to detect such a downward change.

[0043] For details, please refer to Figure 5 and Figure 6 When the energy storage device is connected to an external power supply device, the external power supply device is configured to reduce the output voltage (U0) by 5% or the output frequency by 5Hz (5%) when the output power reaches the rated power, and return to 100% after a first preset time.

[0044] The energy storage device can detect changes in the output voltage, output frequency, and other electrical parameters of the external power supply device through the voltage detection module. At this time, when the output electrical parameter of the power supply device completes the change (i.e., the output electrical parameter of the power supply device changes from parameter A to parameter B, remains at parameter B for a certain period of time, and then changes back to parameter A), the energy storage device can calculate the output power Pin of the external power supply device based on the output voltage and output current of the power supply device, that is, the input voltage and input current of the AC input port. This output power Pin is also the rated power supply of the external power supply device.

[0045] In other embodiments of the present application, the above-mentioned obtaining the rated power supply of the power supply device may also include: sending a read instruction to the power supply device, and obtaining the rated power supply fed back by the power supply device in response to the read instruction.

[0046] In other words, the data exchange method can be used to obtain information such as the rated power supplied by the power supply equipment.

[0047] Accordingly, after obtaining the rated power of the power supply device, the first maximum output power of the energy storage device when supplying power to the load together with the power supply device can be determined based on the rated power Pin. For example, the first maximum output power can be set to 90% Pin.

[0048] In some embodiments of the present application, after obtaining the rated power supply power of the power supply device, the method may further include: using the first maximum output power as the maximum output power of the power supply device.

[0049] At the same time, the maximum power of the inverter of the energy storage device can also be synchronously set to the first maximum output power. Specifically, the conversion power of the inverter of the energy storage device can be controlled by controlling the duty cycle of the switch tube.

[0050] Please refer to Figure 5 and Figure 6 At this point, the energy storage device's output power is less than its maximum output power Pmax and is 90% Pin, where Pin is the first maximum output power. This ensures that when a low-power power supply device and a load are simultaneously connected to the energy storage device, the low-power power supply device can still supply power to the load, and will not be damaged after the load is removed.

[0051] After obtaining the rated power supply power and the first maximum output power, the energy storage device can perform power supply control according to the rated power supply power.

[0052] In some embodiments of the present application, when the current required power of the load is less than the rated power supply of the power supply device, the energy storage device can obtain a second power difference between the rated power supply and the current required power, and charge the energy storage device according to the second power difference.

[0053] Specifically, if the load's current power demand is less than the rated power supply of the power supply device, this indicates that after the power supply device has fully output and supplied power to the load, some residual power remains. The second power difference represents this residual power. The energy storage device can then charge the energy storage device based on the second power difference, utilizing this residual power from the power supply device to charge the energy storage device. This allows the power supply device to simultaneously power both the load and the energy storage device.

[0054] Furthermore, since the maximum output power of the power supply device is limited to the first maximum output power, a third power difference between the first maximum output power and the current required power can be obtained, and the energy storage device can be charged according to the third power difference.

[0055] For example, if the rated power of the external power supply device is 1000W and the current power demand of the load is 500W, the maximum output power of the power supply device is set to 900W, of which 500W will be used to power the load and the remaining 400W will be used to charge the energy storage device.

[0056] Correspondingly, when the current power demand of the load is greater than the rated power supply, it means that the power provided by the power supply device is insufficient to meet the needs of the load. At this time, the energy storage device can control the energy storage device and the power supply device to supply power to the load together according to the rated power supply, the first maximum output power and the current power demand of the load.

[0057] Specifically, such as Figure 7 As shown, the above step S203 may include the following steps S701 to S703.

[0058] Step S701: Determine the second maximum output power of the power supply device according to the rated power supply power.

[0059] The second maximum output power is the maximum output power of the power supply device when outputting power, and may be less than or equal to the rated power supply. For example, the first maximum output power may be used as the second maximum output power, for example, also set to 90% of the rated power supply.

[0060] Step S702: Calculate a first power difference between the current required power of the load and the second maximum output power.

[0061] Specifically, the first power difference indicates that the power supply device outputs power to the load according to the second maximum output power to meet the power required for normal operation of the load. It should be understood that the power required for normal operation of the load is provided by the energy storage device.

[0062] Step S703 : When the first power difference is less than the first maximum output power, control the energy storage device to output the first power difference, so that the energy storage device and the power supply device together supply power to the load.

[0063] Specifically, when the first power difference is less than the first maximum output power, it indicates that the power that the energy storage device needs to provide to the load does not exceed the maximum output power allowed for the energy storage device to output to the load. At this time, the energy storage device can control itself to output the first power difference so that the energy storage device and the power supply device can jointly supply power to the load to meet the power demand of the load.

[0064] For example, if the rated power supply of the external power supply device is 1000W, the current power demand of the load is 1500W, and the first maximum output power of the external power supply device is set to 900W, the energy storage device will provide 600W of power to power the load. In this way, the power supply device can be used to power the load first.

[0065] It is understandable that when the load is suddenly unloaded, the energy storage device is in current source mode, the current cannot change suddenly, and the first power difference output will flow into the external power supply device. Since the rated power supply power of the external power supply device is greater than the first power difference, this part of energy will not cause damage to the external power supply device, which is conducive to ensuring the safety of the power supply equipment.

[0066] In other embodiments of the present application, when the current required power of the load is greater than the sum of the rated power supply power and the first maximum output power, it indicates that the power that the energy storage device needs to provide to the load has exceeded the maximum output power allowed for the energy storage device to output to the load, and the energy storage device can output a first prompt message.

[0067] The first prompt information may be used to prompt that the power supply device does not support the on-load load.

[0068] Specifically, when the current power demand of the load is greater than the sum of the rated power supply and the first maximum output power, it means that the power that the energy storage device needs to provide to the load is greater than the first maximum output power. If the power provided by the energy storage device to the load is greater than the first maximum output power, if the load is suddenly unloaded, this power will flow back to the power supply device. The power received by the power supply device instantaneously may exceed the rated power supply, and thus, there is a risk of damage to the power supply device. Therefore, by outputting the first prompt information, the user can be prompted to adjust the device usage strategy. For example, the user can disconnect the power supply device and let the energy storage device alone power the load.

[0069] Please refer to Figure 3 After outputting the first prompt information, if a power supply instruction is detected, the energy storage device can disconnect the first access switch (K1) and control the energy storage device to output power according to the current required power of the load and the rated output power of the inverter.

[0070] After outputting the first prompt information, the user can trigger the power supply instruction through a button, touch screen or other device on the energy storage device, or can trigger the power supply instruction through an application on a mobile device that has established a connection with the energy storage device. This application does not impose any restrictions on this. The power supply instruction indicates that the user instructs the energy storage device to continue to supply power to the load. Therefore, in response to the power supply instruction, the energy storage device can disconnect the first access switch to disconnect the parallel connection between the energy storage device and the power supply device, and control the energy storage device to output power according to the current power demand of the load and the rated output power of the inverter, and the energy storage device enters the current source mode to supply power to the load alone.

[0071] Specifically, when the load's current power demand is less than or equal to the inverter's rated output power, the energy storage device can be controlled to output the current power demand to the load. When the load's current power demand is greater than the inverter's rated output power, the energy storage device can be controlled to output the rated output power to the load.

[0072] In other embodiments, after outputting the first prompt information, if a power supply instruction is detected, the energy storage device may output a second prompt information. The second prompt information may be used to prompt the power supply device to be removed.

[0073] If it is continuously detected that the power supply device and the energy storage device are in a connected state within the second preset time period, the energy storage device may similarly disconnect the first access switch.

[0074] If it is detected that the power supply device and the energy storage device are in a disconnected state or the first access switch is in an off state, the energy storage device is controlled to output power according to the current required power of the load and the rated output power of the inverter.

[0075] That is, after outputting the first prompt message, if the user triggers the power supply instruction, the energy storage device can output a second prompt message, prompting the user to actively disconnect the power supply device and the energy storage device. If the user disconnects the power supply device and the energy storage device within the second preset time, the power supply device and the energy storage device are disconnected, and the energy storage device will control the power output of the energy storage device based on the current power demand of the load and the rated output power of the inverter. The energy storage device will then enter current source mode to power the load alone.

[0076] If the user does not disconnect the power supply device and the energy storage device within the second preset time period, the energy storage device can disconnect the first access switch. When the first access switch is in the off state, the parallel connection between the energy storage device and the power supply device is disconnected. Therefore, the energy storage device can also control the power output of the energy storage device based on the current power demand of the load and the rated output power of the inverter, and the energy storage device enters the current source mode to independently power the load.

[0077] It is understandable that when the first access switch is disconnected, the energy storage device enters the current source mode to supply power to the load alone. The energy provided by the energy storage device to the load cannot flow back to the external power supply device, thereby ensuring the safety of the device.

[0078] It should be noted that, for the sake of simplicity of description, the aforementioned method embodiments are all expressed as a series of action combinations. However, those skilled in the art should be aware that this application is not limited to the described order of actions, because according to this application, certain steps can be performed in other orders.

[0079] like Figure 8 FIG2 is a schematic structural diagram of a charge and discharge control device 800 provided in an embodiment of the present application, wherein the charge and discharge control device 800 is configured on an energy storage device.

[0080] Specifically, the charge and discharge control device 800 may include:

[0081] An acquiring unit 801 is configured to acquire a rated power supply of the power supply device;

[0082] a determining unit 802, configured to determine, based on the rated power supply, a first maximum output power of the energy storage device when supplying power to the load together with the power supply device, the first maximum output power being less than or equal to the rated power supply;

[0083] The control unit 803 is used to control the energy storage device and the power supply device to supply power to the load together according to the rated power supply power, the first maximum output power and the current power demand of the load when the current power demand of the load is greater than the rated power supply power.

[0084] In some embodiments of the present application, the above-mentioned acquisition unit 801 can be specifically used to: obtain the output voltage and output current of the power supply device when it is detected that the electrical parameters of the electrical signal output by the power supply device drop to a first preset electrical parameter and maintain a first preset time length; determine the rated power supply power based on the output voltage and the output current.

[0085] In some embodiments of the present application, the acquisition unit 801 may be specifically configured to: send a read instruction to the power supply device; and acquire the rated power supplied by the power supply device in response to the read instruction.

[0086] In some embodiments of the present application, the charge and discharge control device 800 may further include a setting unit configured to set the first maximum output power as the maximum output power of the power supply device.

[0087] In some embodiments of the present application, the above-mentioned control unit 803 can be specifically used to: determine the second maximum output power of the power supply device based on the rated power supply power, and the second maximum output power is less than or equal to the rated power supply power; calculate the first power difference between the current required power of the load and the second maximum output power; when the first power difference is less than the first maximum output power, control the energy storage device to output the first power difference, so that the energy storage device and the power supply device supply power to the load together.

[0088] In some embodiments of the present application, the above-mentioned control unit 803 can also be specifically used to: when the current required power of the load is greater than the sum of the rated power supply power and the first maximum output power, output a first prompt message, and the first prompt message is used to prompt that the power supply device does not support carrying the load.

[0089] In some embodiments of the present application, the above-mentioned control unit 803 can also be specifically used to: after outputting the first prompt information, if a power supply instruction is detected, disconnect the first access switch, and control the energy storage device to output power according to the current required power of the load and the rated output power of the inverter.

[0090] In some embodiments of the present application, the above-mentioned control unit 803 can also be specifically used to: after outputting the first prompt information, if a power supply instruction is detected, output a second prompt information, and the second prompt information is used to prompt the removal of the power supply device; if the power supply device and the energy storage device are continuously detected to be in a connected state within a second preset time period, disconnect the first access switch; if it is detected that the power supply device and the energy storage device are in a disconnected state or the first access switch is in a disconnected state, control the energy storage device to output power according to the current required power of the load and the rated output power of the inverter.

[0091] In some embodiments of the present application, the above-mentioned control unit 803 can also be specifically used to: when the current required power of the load is less than the rated power supply power of the power supply device, obtain a second power difference between the rated power supply power and the current required power; and charge the energy storage device according to the second power difference.

[0092] It should be noted that for the convenience and simplicity of description, the specific working process of the above-mentioned charge and discharge control device 800 can be referred to Figures 1 to 7 The corresponding process of the method will not be described in detail here.

[0093] like Figure 9FIG. 1 is a schematic diagram of an energy storage device provided in an embodiment of the present application. The energy storage device 9 may include: a processor 90, a memory 91, and a computer program 92 stored in the memory 91 and executable on the processor 90, such as a charge and discharge control program. When the processor 90 executes the computer program 92, the steps in the above-mentioned charge and discharge control method embodiments are implemented, such as Figure 2 Alternatively, when the processor 90 executes the computer program 92, the functions of the modules / units in the above-mentioned device embodiments are realized, for example, Figure 8 The functions of the acquisition unit 801, the determination unit 802 and the control unit 803 are shown.

[0094] The computer program may be divided into one or more modules / units, which are stored in the memory 91 and executed by the processor 90 to complete the present application. The one or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in the energy storage device.

[0095] For example, the computer program can be divided into: an acquisition unit, a determination unit, and a control unit. The specific functions of each unit are as follows: an acquisition unit, for acquiring the rated power supply of the power supply device; a determination unit, for determining, based on the rated power supply, a first maximum output power of the energy storage device when supplying power to the load together with the power supply device, wherein the first maximum output power is less than or equal to the rated power supply; a control unit, for controlling the energy storage device and the power supply device to supply power to the load together based on the rated power supply, the first maximum output power, and the current power demand of the load when the current power demand of the load is greater than the rated power supply.

[0096] The energy storage device may include, but is not limited to, a processor 90 and a memory 91. Those skilled in the art will understand that Figure 9 The energy storage device is merely an example and does not constitute a limitation of the energy storage device. The energy storage device may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the energy storage device may also include input and output devices, network access devices, buses, etc.

[0097] The processor 90 may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0098] The memory 91 may be an internal storage unit of the energy storage device, such as a hard disk or memory of the energy storage device. The memory 91 may also be an external storage device of the energy storage device, such as a plug-in hard disk equipped on the energy storage device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Furthermore, the memory 91 may also include both an internal storage unit of the energy storage device and an external storage device. The memory 91 is used to store the computer program and other programs and data required by the energy storage device. The memory 91 may also be used to temporarily store data that has been output or is to be output.

[0099] It should be noted that, for the convenience and brevity of description, the structure of the above energy storage device can also refer to the specific description of the structure in the method embodiment, which will not be repeated here.

[0100] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0101] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0102] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0103] In the embodiments provided in the present application, it should be understood that the disclosed devices / energy storage devices and methods can be implemented in other ways. For example, the device / energy storage device embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0104] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0105] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0106] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0107] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A charge and discharge control method, characterized in that: Applied to an energy storage device, the energy storage device includes an inverter, and the energy storage device is used to be connected to a power supply device and a load respectively through the inverter. The charge and discharge control method includes: Obtaining the rated power supply of the power supply device; Determining, based on the rated power supply power, a first maximum output power of the energy storage device when supplying power to the load together with the power supply device, the first maximum output power being less than or equal to the rated power supply power; When the current required power of the load is greater than the rated power supply power, the energy storage device and the power supply device are controlled to supply power to the load together according to the rated power supply power, the first maximum output power and the current required power of the load, wherein the output power of the power supply device is less than or equal to the rated power supply power.

2. The charge and discharge control method according to claim 1, wherein: The obtaining of the rated power supply of the power supply device includes: When detecting that the electrical parameter of the electrical signal output by the power supply device drops to a first preset electrical parameter and maintains for a first preset time period, obtaining the output voltage and output current of the power supply device; The rated power supply is determined according to the output voltage and the output current.

3. The charge and discharge control method according to claim 1, wherein: The obtaining of the rated power supply of the power supply device includes: Sending a read instruction to the power supply device; The rated power supply power fed back by the power supply device in response to the read instruction is acquired.

4. The charge and discharge control method according to any one of claims 1 to 3, wherein: After determining, based on the rated power supply, a first maximum output power of the energy storage device when supplying power to the load together with the power supply device, the method further includes: The first maximum output power is used as the maximum output power of the power supply device.

5. The charge and discharge control method according to any one of claims 1 to 3, wherein: When the current required power of the load is greater than the rated power supply, controlling the energy storage device and the power supply device to supply power to the load together according to the rated power supply, the first maximum output power, and the current required power of the load includes: determining a second maximum output power of the power supply device according to the rated power supply power, where the second maximum output power is less than or equal to the rated power supply power; Calculating a first power difference between the current required power of the load and the second maximum output power; When the first power difference is less than the first maximum output power, the energy storage device is controlled to output the first power difference, so that the energy storage device and the power supply device together supply power to the load.

6. The charge and discharge control method according to any one of claims 1 to 3, wherein: The charge and discharge control method further includes: When the current required power of the load is greater than the sum of the rated power supply power and the first maximum output power, a first prompt message is output, where the first prompt message is used to prompt that the power supply device does not support carrying the load.

7. The charge and discharge control method according to claim 6, wherein: The energy storage device includes a first access switch, a battery pack, and an inverter; the battery pack is connected to a first end of the inverter; a second end of the inverter is connected to the power supply device via the first access switch; the second end of the inverter is also used to connect to a load, and the charge and discharge control method includes: After outputting the first prompt information, if a power supply instruction is detected, the first access switch is disconnected, and the energy storage device is controlled to output power according to the current required power of the load and the rated output power of the inverter.

8. The charge and discharge control method according to claim 6, wherein: The energy storage device includes a first access switch, a battery pack, and an inverter; the battery pack is connected to a first end of the inverter; a second end of the inverter is connected to the power supply device via the first access switch; the second end of the inverter is also used to connect to a load, and the charge and discharge control method further includes: After outputting the first prompt information, if a power supply instruction is detected, outputting a second prompt information, wherein the second prompt information is used to prompt the user to remove the power supply device; If it is continuously detected that the power supply device and the energy storage device are in a connected state within a second preset time period, disconnecting the first access switch; If it is detected that the power supply device and the energy storage device are in a disconnected state or the first access switch is in an off state, the energy storage device is controlled to output power according to the current required power of the load and the rated output power of the inverter.

9. The charge and discharge control method according to any one of claims 1 to 3, wherein: The charge and discharge control method further includes: When the current required power of the load is less than the rated power supply of the power supply device, obtaining a second power difference between the rated power supply and the current required power; The energy storage device is charged according to the second power difference.

10. An energy storage device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the charge and discharge control method according to any one of claims 1 to 9 are implemented.

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