Energy storage system control method, device, storage medium and system

Abstract

The present invention is applicable to the technical field of new energy vehicles, and provides a method, device, storage medium and system for controlling an energy storage system, wherein the method comprises: collecting real-time status data of a first battery pack and a second battery pack, and obtaining a first voltage value and a second voltage value respectively; obtaining a calibrated voltage difference; obtaining a corrected voltage difference based on the calibrated voltage difference and a correction coefficient; after obtaining the switching requirement from single-pack output to dual-pack output, subtracting the larger value from the smaller value of the first voltage value and the second voltage value at this moment to obtain a real-time voltage difference; when and only when the real-time voltage difference is equal to the corrected voltage difference, executing the switching from single-pack output to dual-pack output. This solution can accurately and flexibly control the state switching of dual-pack batteries, can effectively reduce heat loss and energy waste, and extend the service life of the battery and the endurance of the system.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and in particular relates to an energy storage system control method, device, storage medium and system. Background Art

[0002] In recent years, my country's new energy and tourism industries have developed very rapidly, and RVs have appeared more and more in the public's view. As a new way of travel and accommodation, RVs contain a large number of intelligent devices and high-power electrical appliances, so the power supply of RVs has always been a concern.

[0003] Since the capacity of low-voltage energy storage systems is relatively low, it cannot guarantee the long-term use of household appliances, nor can it quickly replenish electricity. Therefore, the high-voltage battery pack parallel solution is gradually becoming popular, which can not only optimize the layout of RVs, but also increase the total battery capacity, and can meet the configuration requirements of single-pack power supplies and dual-pack power supplies at the same time.

[0004] The dual-pack parallel control method currently on the market is to obtain the actual vehicle calibration data and test data to determine the voltage difference between the two battery packs in the parallel state, and then switch between parallel power supply and separate power supply. Although this control method can ensure that when the dual batteries are connected in parallel, there will be no large current loop between the dual packs, but there will still be a small current loop, causing problems such as increased heating of the battery pack, internal energy consumption, and uneven battery discharge.

[0005] Therefore, it is necessary to improve the control method of the existing dual battery pack parallel energy storage system. Summary of the invention

[0006] The purpose of the embodiments of the present application is to provide a method for controlling an energy storage system, aiming to solve the problems of the existing control method for a dual-battery pack parallel energy storage system, which has a single state switching mode, poor control accuracy, and the dual-pack battery is prone to internal current reflux when in use, as well as high heat generation and large heat loss.

[0007] The embodiment of the present application is implemented by providing a method for controlling an energy storage system, the method comprising:

[0008] Collect real-time status data of the first battery pack and the second battery pack to obtain a first voltage value and a second voltage value respectively; obtain a calibrated voltage difference, wherein the calibrated voltage difference is a preset switching voltage threshold for converting from single-pack output to dual-pack output; obtain a corrected voltage difference based on the calibrated voltage difference and a correction coefficient, wherein the correction coefficient is used to correct the switching voltage threshold; when the switching requirement from single-pack output to dual-pack output is obtained, the larger value and the smaller value of the first voltage value and the second voltage value at this moment are subtracted to obtain a real-time voltage difference; if and only if the real-time voltage difference is equal to the corrected voltage difference, execute the switching from single-pack output to dual-pack output.

[0009] Preferably, based on the calibrated voltage difference and the correction coefficient, a method for obtaining the corrected voltage difference is:

[0010] .

[0011] Preferably, the correction coefficient is obtained by:

[0012] Under the single battery pack output state, the remaining power, working voltage and working current of the current working battery pack are obtained to obtain the real-time power of the working battery pack; based on the three-dimensional data correspondence of remaining power-real-time power-correction coefficient, the correction coefficient corresponding to the current remaining power and real-time power is obtained.

[0013] Preferably, the numerical relationship between the remaining power, the real-time power and the correction coefficient in the three-dimensional data correspondence is specifically:

[0014] When the real-time power is a constant value, the lower the remaining power is, the negatively correlated relationship therebetween with the correction coefficient; when the remaining power is a constant value, the real-time power is a constant value and the correction coefficient is positively correlated therebetween.

[0015] Preferably, after switching from single-pack output to dual-pack output to enter the dual-pack output mode, the first battery pack and the second battery pack are controlled to output equal currents to supply power to an external load.

[0016] Preferably, the method for collecting real-time status data of the first battery pack and the second battery pack is:

[0017] The battery controller is connected to the first battery pack and the second battery pack, and communication and interaction are performed through CAN messages to obtain real-time status data of the first battery pack and the second battery pack.

[0018] Another object of an embodiment of the present application is to provide an energy storage system control device, the energy storage system control device comprising:

[0019] A first voltage value and a second voltage value acquisition unit, used to collect real-time status data of the first battery pack and the second battery pack, and obtain the first voltage value and the second voltage value respectively;

[0020] A calibration voltage difference acquisition unit, used to acquire a calibration voltage difference, where the calibration voltage difference is a preset switching voltage threshold for switching from a single-packet output to a dual-packet output;

[0021] A corrected voltage difference value obtaining unit, used to obtain a corrected voltage difference value based on the calibrated voltage difference value and a correction coefficient, wherein the correction coefficient is used to correct the switching voltage threshold value;

[0022] A real-time voltage difference acquisition unit, configured to obtain a real-time voltage difference by subtracting a larger value from a smaller value between the first voltage value and the second voltage value at this moment after obtaining a switching requirement from single-package output to dual-package output;

[0023] The switching control unit is used to execute the switching from single-packet output to dual-packet output when and only when the real-time voltage difference is equal to the corrected voltage difference.

[0024] Preferably, in the corrected voltage difference value obtaining unit, a method for obtaining the corrected voltage difference value is:

[0025] .

[0026] Another object of an embodiment of the present application is to provide a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the processor executes the steps of the energy storage system control method as described above.

[0027] Another object of an embodiment of the present application is to provide an energy storage system control system, the system comprising a dual-pack battery controller, and the dual-pack battery controller, when running, executes the steps of the energy storage system control method as described above.

[0028] An energy storage system control method provided in an embodiment of the present application can reasonably and effectively perform dual battery pack parallel control according to the real-time operating conditions of the energy storage system, make the state switching of the dual battery packs more accurate and flexible, and can effectively reduce heat loss and energy waste, thereby extending the battery life and system endurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 An application environment diagram of an energy storage system control method provided in an embodiment of the present application;

[0030] Figure 2 A flow chart of a method for controlling an energy storage system provided in an embodiment of the present application;

[0031] Figure 3 A visualization data diagram of a three-dimensional data correspondence relationship provided in an embodiment of the present application;

[0032] Figure 4 Another visualization data diagram of the three-dimensional data correspondence provided in an embodiment of the present application;

[0033] Figure 5 A module diagram of an energy storage system control device provided in an embodiment of the present application;

[0034] Figure 6 FIG. 4 is a block diagram of the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first battery pack may be referred to as a second battery pack, and similarly, a second battery pack may be referred to as a first battery pack.

[0037] Figure 1 The application environment diagram of the energy storage system control method provided in the embodiment of the present application is as follows: Figure 1 As shown, in this application environment, a battery 110 and a control device 120 are included.

[0038] The control device 120 may refer to various dedicated controllers or single-chip microcomputers, smart computers, etc. The battery 110 may refer to a battery in a vehicle or other vehicle, etc. The battery 110 and the control device 120 may be connected by wire or wirelessly, and this application does not limit this.

[0039] like Figure 2 As shown, in one embodiment, a method for controlling an energy storage system is proposed. This embodiment mainly applies the method to the above Figure 1 A method for controlling an energy storage system may include the following steps:

[0040] Step S10, collecting real-time status data of the first battery pack and the second battery pack, and obtaining corresponding first voltage values ​​and second voltage values ​​respectively.

[0041] In this embodiment, the energy storage system contains two battery packs, which can be recorded as the first battery pack and the second battery pack, one of which is in the current output state, and the other has no load and no output. Those skilled in the art will know that for the same type of battery, a high voltage means that its internal resistance is small, that is, the remaining available capacity is higher. When a single pack is output, a battery with a higher voltage is often selected for output. For example, battery pack 1 is 52V and battery pack 2 is 50V. At this time, battery pack 1 is in the output state.

[0042] Step S20, obtaining a calibrated voltage difference value, where the calibrated voltage difference value is a preset switching voltage threshold for switching from single-packet output to dual-packet output.

[0043] In this embodiment, the calibrated voltage difference refers to the default switching voltage threshold preset by the general battery when the dual pack is bound at the factory. For example, in the traditional solution, assuming that the calibrated voltage difference is 2V, the voltage of battery pack one is 350V, and the voltage of battery pack two in use is 353V. If the system has a demand to output from a single battery pack to a dual battery pack at this time, for example, a high-power electrical appliance is connected, the system will first output current from battery pack two with a higher voltage alone, until the actual voltage difference becomes 352V-350V=2V (i.e., equal to the calibrated voltage difference of 2V), at which time the dual pack battery enters the parallel mode, and the dual packs output simultaneously.

[0044] S30, obtaining a corrected voltage difference based on the calibrated voltage difference and a correction coefficient, wherein the correction coefficient is used to correct the switching voltage threshold.

[0045] In this embodiment, since the switching voltage threshold for the dual battery pack in the prior art is a fixed value, this application provides different correction coefficients under different working conditions, and can correct the value based on the actual working conditions, making the control more precise and flexible, and the switching nodes more accurate. In addition, setting the correction coefficient has another outstanding advantage, that is, when the power consumption is not high, on the premise that the single pack can meet the user's requirements, the working time of the single battery pack is extended, the number of frequent switching is reduced, and the single battery pack is allowed to extend the use time as much as possible before entering the parallel mode.

[0046] Step S40: after the switching requirement from single-packet output to dual-packet output is obtained, the larger value and the smaller value of the first voltage value and the second voltage value at this moment are subtracted to obtain a real-time voltage difference.

[0047] Step S50: When and only when the real-time voltage difference is equal to the corrected voltage difference, switching from single-packet output to dual-packet output is performed.

[0048] In this embodiment, for example, the correction coefficient is set to -1, the calibrated voltage difference is 2V, the voltage of the used battery pack 1 is 354V, and the voltage of the unused battery pack 2 is 350V. In the traditional solution, when the battery pack 1 drops to 352V, it enters the parallel mode, but after the modification of this application, the battery pack 1 will enter the parallel mode only when it drops to 348V, thereby avoiding the frequent charging and discharging of multiple batteries and the negative effects such as increased heat generation caused by switching and dual pack output.

[0049] In the embodiments of the present application, the need to switch from a single package to a dual package is a relatively common situation. For example, when most electrical appliances in the vehicle are in standby or low-power state, turning on high-power equipment such as air conditioners and induction cookers may trigger the need to switch from a single package to a dual package.

[0050] At present, the market's dual-pack parallel control is determined by actual vehicle calibration and test data, that is, the calibration voltage difference of the two battery packs entering the parallel state is first determined by measurement. This value is a certain value. Therefore, the traditional control method causes the battery to still have a small current loop during actual use, causing the battery pack to heat up, increase the internal energy consumption, and uneven battery discharge. In an embodiment of the present application, through the setting of the above-mentioned scheme, the system can effectively and reasonably perform dual-pack parallel control according to the real-time operating conditions of the energy storage system, accurately control the switching thresholds under different operating conditions, and ensure the normal power consumption and safety of the power supply system, reduce the energy internal consumption of the battery pack, and improve the discharge capacity and service life of the dual pack.

[0051] In one embodiment of the present application, the system is used to supply energy to a motorhome. The high-voltage dual-pack battery installed in the motorhome is composed of two 360V high-voltage battery packs (18 degrees) connected in parallel. The high-voltage dual-pack energy storage system can provide 220V AC power and 12V low-voltage DC power to supply energy to the motorhome's electrical equipment.

[0052] In a preferred embodiment, based on the calibrated voltage difference and the correction coefficient, a method for obtaining the corrected voltage difference is:

[0053] .

[0054] In the embodiment of the present application, the correction coefficient is determined based on the different actual states of the battery. By setting different correction parameters at different voltages, currents and capacities, a smaller loss is generated between the double-pack batteries after switching. The correction coefficient can be a coefficient ranging from negative to positive.

[0055] In a preferred embodiment, the method for obtaining the correction coefficient is: in the single battery pack output state, the remaining power, working voltage and working current of the current working battery pack are obtained to obtain the real-time power of the working battery pack; based on the three-dimensional data correspondence of remaining power-real-time power-correction coefficient, the correction coefficient corresponding to the current remaining power and real-time power is obtained.

[0056] In an embodiment of the present application, the three-dimensional data correspondence of remaining power-real-time power-correction coefficient can be obtained by looking up the corresponding table shown below, where the horizontal axis is the remaining power, the vertical axis is the real-time power, and the data in the table is the correction coefficient.

[0057] ;

[0058] In one embodiment of the present application, Figure 3 Taking the three-dimensional rectangular coordinate system shown as an example, a relationship between remaining power, real-time power and correction coefficient is given, and the corresponding correction coefficient can be read based on the graph. More accurate and specific correction coefficients can be repeatedly tested and calibrated according to different battery pack brands, coefficients, and power consumption, and finally the surface with the best effect is determined to build a data correspondence database. It can be understood that the three-dimensional data correspondence relationship can refer to the correlation data correspondence diagram composed of three variables, which may have multiple forms of expression and not necessarily as follows. Figure 3 The three-dimensional figure is shown.

[0059] In a preferred embodiment, the numerical relationship between the remaining power, the real-time power and the correction coefficient in the three-dimensional data correspondence is specifically: when the real-time power is a constant, the lower the remaining power is, the negatively correlated relationship with the correction coefficient is; when the remaining power is a constant, the real-time power is a constant and the correction coefficient is positively correlated.

[0060] In the embodiment of the present application, through the above-mentioned configuration, factors such as heat generation during double pack discharge, battery pack loss, and battery pack life can be balanced as much as possible to improve the overall performance of the system. Figure 4 As shown in Figure 2, another visualization of the three-dimensional data correspondence is given. The data change trend shown in this figure can be compared with Figure 3 Similar. Figure 4 The actual power consumption is the output power of the system, and the battery power is the percentage of the total power. Figure 4 The curves in are several equal correction parameter lines. The changing trend is that the greater the actual power consumption, the lower the remaining power of the battery pack, and the greater the final correction voltage difference; similarly, the smaller the actual power consumption, the higher the remaining power of the battery pack, and the smaller the final correction voltage difference.

[0061] In a preferred embodiment, after switching from single-pack output to dual-pack output to enter the dual-pack output mode, the first battery pack and the second battery pack are controlled to output equal currents to supply power to an external load.

[0062] In the embodiment of the present application, supplying power with the same output current is beneficial to extending battery life and reducing internal friction and reflux.

[0063] In a preferred embodiment, the method for collecting real-time status data of the first battery pack and the second battery pack is:

[0064] The battery controller is connected to the first battery pack and the second battery pack, and communication and interaction are performed through CAN messages to obtain real-time status data of the first battery pack and the second battery pack.

[0065] In the embodiment of the present application, the battery controller can be connected to the first battery pack and the second battery pack through a data bus, and the battery controller can obtain real-time status data of the battery through the data line.

[0066] like Figure 5 As shown, in one embodiment, an energy storage system control device is provided, which can be integrated into the above-mentioned control device 120, and specifically can include a first voltage value and a second voltage value acquisition unit 510, a calibrated voltage difference acquisition unit 520, a corrected voltage difference acquisition unit 530, a real-time voltage difference acquisition unit 540, and a switching control unit 550.

[0067] The first voltage value and the second voltage value acquisition unit 510 are used to collect the real-time status data of the first battery pack and the second battery pack, and obtain the first voltage value and the second voltage value respectively;

[0068] A calibration voltage difference acquisition unit 520, used to acquire a calibration voltage difference, where the calibration voltage difference is a preset switching voltage threshold for switching from a single-packet output to a dual-packet output;

[0069] A corrected voltage difference value obtaining unit 530, configured to obtain a corrected voltage difference value based on the calibrated voltage difference value and a correction coefficient, wherein the correction coefficient is used to correct the switching voltage threshold value;

[0070] A real-time voltage difference acquisition unit 540 is used to obtain a real-time voltage difference by subtracting a larger value from a smaller value between the first voltage value and the second voltage value at this moment after obtaining a switching requirement from single-packet output to dual-packet output;

[0071] The switching control unit 550 is used to execute the switching from single-packet output to dual-packet output when and only when the real-time voltage difference is equal to the corrected voltage difference.

[0072] In the embodiments of the present application, the explanation and description of the above-mentioned energy storage system control device can refer to the explanation and description of the above-mentioned corresponding method. For the description of the above-mentioned energy storage system control method, please refer to the above text and will not be repeated here.

[0073] In the embodiment of the present application, the dual battery packs can be reasonably and effectively controlled in parallel according to the real-time operating conditions of the energy storage system, and the state switching of the dual battery packs can be more accurate and flexible, which can effectively reduce heat loss and energy waste, thereby extending the battery life and system endurance.

[0074] In one embodiment, in the modified voltage difference acquisition unit, a method for obtaining the modified voltage difference is:

[0075] .

[0076] In the embodiments of the present application, the explanation of the above formula can be found in the corresponding explanation of the above method.

[0077] Figure 6 The internal structure diagram of a computer device in one embodiment is shown. The computer device may specifically be Figure 1 The control device 120 in FIG. Figure 6 As shown, the controller device includes a processor, a memory, a network interface, an input device and a display screen connected via a system bus. Among them, the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program, which, when executed by the processor, enables the processor to implement the energy storage system control method. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to execute the energy storage system control method.

[0078] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0079] In one embodiment, the energy storage system control device provided in the present application can be implemented in the form of a computer program. The computer program can be Figure 6 The computer device shown in the figure is run on the computer device. The memory of the computer device can store various program modules constituting the energy storage system control device, for example, Figure 5The first voltage value and the second voltage value acquisition unit 510, the calibrated voltage difference acquisition unit 520, the corrected voltage difference acquisition unit 530, etc. are shown. The computer program composed of various program modules enables the processor to execute the steps of the energy storage system control method of each embodiment of the present application described in this specification.

[0080] For example, Figure 6 The computer device shown can be Figure 5 The first voltage value and second voltage value acquisition unit 510 in the energy storage system control device shown in the figure performs step S10. The computer device can perform step S20 through the calibration voltage difference acquisition unit 520. And so on.

[0081] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the processor executes the steps of the energy storage system control method as described above.

[0082] In the embodiment of the present application, please refer to the above for the description of the above-mentioned energy storage system control method, which will not be repeated here.

[0083] In an embodiment of the present application, the program run based on the method stored in the storage medium of the embodiment of the present application can reasonably and effectively control the dual battery packs in parallel according to the real-time operating conditions of the energy storage system, and make the state switching of the dual battery packs more accurate and flexible, which can effectively reduce heat loss and energy waste, thereby extending the battery life and the system's endurance.

[0084] In one embodiment, an energy storage system control system is provided, the system comprising a dual-pack battery controller, and the dual-pack battery controller, when running, executes the steps of the energy storage system control method as described above.

[0085] In an embodiment of the present application, the system may be a computer software or program system running in hardware containing a processing device, and when the system is running, the corresponding method is executed. The system includes a dual-pack battery controller, and when the dual-pack battery controller is running, the steps of the energy storage system control method as described above are executed. Please refer to the above for the description of the energy storage system control method, which will not be repeated here.

[0086] In the embodiment of the present application, based on the present system, the dual battery packs can be reasonably and effectively controlled in parallel according to the real-time operating conditions of the energy storage system, and the state switching of the dual battery packs can be more accurate and flexible, which can effectively reduce heat loss and energy waste, thereby extending the battery life and the system endurance.

[0087] It should be understood that, although each step in the flow chart of each embodiment of the present application is shown in sequence according to the indication of the arrow, these steps are not necessarily performed in sequence according to the order indicated by the arrow. Unless there is clear explanation in this article, the execution of these steps does not have strict order restriction, and these steps can be performed in other orders. Moreover, at least a portion of the steps in each embodiment may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and the execution order of these sub-steps or stages is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of other steps or sub-steps or stages of other steps.

[0088] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0089] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for controlling an energy storage system, characterized in that: The method comprises: Collecting real-time status data of the first battery pack and the second battery pack to obtain a first voltage value and a second voltage value respectively; Acquire a calibrated voltage difference value, where the calibrated voltage difference value is a preset switching voltage threshold for switching from single-packet output to dual-packet output; Based on the calibrated voltage difference and the correction coefficient, a corrected voltage difference is obtained, wherein the correction coefficient is used to correct the switching voltage threshold; When the switching demand from single-package output to dual-package output is obtained, the larger value and the smaller value of the first voltage value and the second voltage value at this moment are subtracted to obtain a real-time voltage difference value; When and only when the real-time voltage difference is equal to the corrected voltage difference, switching from single-packet output to dual-packet output is performed; Based on the calibrated voltage difference and the correction coefficient, the method for obtaining the corrected voltage difference is: ； The method for obtaining the correction coefficient is: In the single battery pack output state, obtain the remaining power, working voltage and working current of the current working battery pack, and obtain the real-time power of the working battery pack; Based on the three-dimensional data correspondence of remaining power-real-time power-correction coefficient, the correction coefficient corresponding to the current remaining power and real-time power is obtained; The numerical relationship between the remaining power, the real-time power and the correction coefficient in the three-dimensional data correspondence is specifically: When the real-time power is a constant value, the remaining power is negatively correlated with the correction coefficient; When the remaining power is a constant value, the real-time power is positively correlated with the correction coefficient.

2. The energy storage system control method according to claim 1, characterized in that: After switching from single-pack output to dual-pack output to enter the dual-pack output mode, the first battery pack and the second battery pack are controlled to output equal currents to supply power to an external load.

3. The energy storage system control method according to claim 1, characterized in that: The method for collecting the real-time status data of the first battery pack and the second battery pack is: The battery controller is connected to the first battery pack and the second battery pack, and communication and interaction are performed through CAN messages to obtain real-time status data of the first battery pack and the second battery pack.

4. An energy storage system control device, characterized in that: The energy storage system control device comprises: A first voltage value and a second voltage value acquisition unit, used to collect real-time status data of the first battery pack and the second battery pack, and obtain the first voltage value and the second voltage value respectively; A calibration voltage difference acquisition unit, used to acquire a calibration voltage difference, where the calibration voltage difference is a preset switching voltage threshold for switching from a single-packet output to a dual-packet output; A corrected voltage difference value obtaining unit, used to obtain a corrected voltage difference value based on the calibrated voltage difference value and a correction coefficient, wherein the correction coefficient is used to correct the switching voltage threshold value; A real-time voltage difference acquisition unit, configured to obtain a real-time voltage difference by subtracting a larger value from a smaller value between the first voltage value and the second voltage value at this moment after obtaining a switching requirement from single-package output to dual-package output; A switching control unit, configured to switch from single-packet output to dual-packet output when and only when the real-time voltage difference is equal to the corrected voltage difference; In the corrected voltage difference acquisition unit, the method for obtaining the corrected voltage difference is: ； The method for obtaining the correction coefficient is: In the single battery pack output state, obtain the remaining power, working voltage and working current of the current working battery pack, and obtain the real-time power of the working battery pack; Based on the three-dimensional data correspondence of remaining power-real-time power-correction coefficient, the correction coefficient corresponding to the current remaining power and real-time power is obtained; The numerical relationship between the remaining power, the real-time power and the correction coefficient in the three-dimensional data correspondence is specifically: When the real-time power is a constant value, the remaining power is negatively correlated with the correction coefficient; When the remaining power is a constant value, the real-time power is positively correlated with the correction coefficient.

5. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor executes the steps of the energy storage system control method according to any one of claims 1 to 3.

6. An energy storage system control system, characterized in that: The system comprises a dual-pack battery controller, and when the dual-pack battery controller is in operation, the steps of the energy storage system control method as claimed in any one of claims 1 to 3 are executed.

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