Energy storage device control method and energy storage system

Abstract

This application provides a control method and system for an energy storage device. The control method includes: acquiring the maximum charging power and maximum discharging power of each energy storage unit; determining the maximum charging power of the energy storage device based on the maximum charging power of each energy storage unit, and determining the maximum discharging power of the energy storage device based on the maximum discharging power of each energy storage unit; controlling the non-faulty energy storage units in the energy storage device to operate at their maximum charging and discharging power, or controlling the energy storage device to stop operating, based on the maximum charging power, the maximum discharging power, the rated charging power, and the rated discharging power of the energy storage device. This application is used to manage and control a reconfigured lithium battery energy storage system, thereby stabilizing the power output of the lithium battery energy storage system.

Description

Technical Field

[0001] This application relates to battery management technology, and more particularly to a control method for an energy storage device and an energy storage system. Background Technology

[0002] In recent years, with the rapid development of the new energy vehicle market, the number of retired electric vehicle batteries has also been increasing. Retired batteries typically retain 70%-80% of their capacity. Simply discarding large quantities of retired batteries would not only impact the environment but also waste resources. Therefore, more and more companies are focusing on the reuse of retired batteries, especially transforming them into lithium-ion battery energy storage systems to power the grid or other systems.

[0003] However, after their initial use in electric vehicles, the degradation characteristics of retired batteries have changed to some extent, leading to poor consistency among retired batteries in the reconstituted lithium-ion battery energy storage system. Therefore, the power output of the reconstituted lithium-ion battery energy storage system is not very stable and cannot adapt to real-world application scenarios.

[0004] How to manage and control the recombined lithium battery energy storage system to ensure stable power output remains a problem that needs to be solved. Summary of the Invention

[0005] This application provides a control method and system for an energy storage device, used to manage and control a recombined lithium battery energy storage system, thereby stabilizing the power output of the lithium battery energy storage system.

[0006] On one hand, this application provides a control method for an energy storage device, applied to an output control device connected to an energy storage device, wherein an energy storage device includes multiple energy storage units; the method includes:

[0007] Obtain the maximum charging power and maximum discharging power of each energy storage unit;

[0008] The maximum charging power of the energy storage device is determined based on the maximum charging power of each energy storage unit, and the maximum discharge power of the energy storage device is determined based on the maximum discharge power of each energy storage unit.

[0009] Based on the maximum charging power, maximum discharging power, rated charging power, and rated discharging power of the energy storage device, control the non-faulty energy storage units in the energy storage device to operate at maximum charging power and maximum discharging power, or control the energy storage device to stop operating.

[0010] Optionally, controlling the non-faulty energy storage units in the energy storage device to operate at maximum charging and maximum discharging power, or controlling the energy storage device to stop operating, based on the maximum charging power, maximum discharging power, rated charging power, and rated discharging power of the energy storage device, includes:

[0011] When the maximum charging power of the energy storage device is equal to the rated charging power of the energy storage device, and the maximum discharging power of the energy storage device is equal to the rated discharging power of the energy storage device, each energy storage unit is controlled to operate at its maximum charging power and maximum discharging power; or,

[0012] When the maximum charging power of the energy storage device exceeds its rated charging power, and / or the maximum discharging power exceeds its rated discharging power, the number of faulty energy storage units in the energy storage device is obtained, and when the number of faulty energy storage units exceeds a preset number, the energy storage device is controlled to stop operating; or...

[0013] When the maximum charging power of the energy storage device is less than the rated charging power of the energy storage device, and / or when the maximum discharging power of the energy storage device is less than the rated discharging power of the energy storage device, the energy storage device is controlled to stop operating.

[0014] Optional, also includes:

[0015] When the number of faulty energy storage units is less than or equal to the preset number, the total capacity, charging ratio, health status, current remaining power, charging ratio in full charge state, charging ratio in full discharge state, rated charging power and rated discharging power of each energy storage unit are obtained.

[0016] The theoretical charging power output value of each energy storage unit is determined based on its total capacity, charging ratio, health status, current remaining power, charging ratio at full charge, and rated charging power.

[0017] The theoretical discharge power output value of each energy storage unit is determined based on its total capacity, charging ratio, health status, current remaining power, charging ratio in full discharge state, and rated discharge power.

[0018] When the maximum charging power of an energy storage unit is less than the theoretical charging power output value, and / or the maximum discharging power of an energy storage unit is less than the theoretical discharging power output value, an energy storage unit is controlled to operate at the maximum charging power and maximum discharging power of the energy storage unit, wherein the energy storage unit is a non-faulty energy storage unit.

[0019] Optionally, determining the theoretical charging power output value of each energy storage unit based on its total capacity, charging ratio, health status, current remaining power, charging ratio at full charge, and rated charging power includes:

[0020] The remaining charging capacity of an energy storage unit is determined based on its total capacity, charging ratio, health status, current remaining power, and charging ratio at full charge.

[0021] The theoretical charging power output value of an energy storage unit is determined based on the remaining charging capacity and rated charging power of an energy storage unit and the remaining charging capacity of the plurality of energy storage units.

[0022] The determination of the theoretical discharge power output value for each energy storage unit, based on its total capacity, charging ratio, health status, current remaining power, charging ratio at full discharge, and rated discharge power, includes:

[0023] The remaining discharge capacity of an energy storage unit is determined based on its total capacity, charging ratio, health status, current remaining capacity, and charging ratio in a fully discharged state.

[0024] The theoretical discharge power output value of an energy storage unit is determined based on the remaining discharge capacity and rated discharge power of an energy storage unit and the remaining discharge capacity of the plurality of energy storage units.

[0025] Optionally, determining the remaining charging capacity of an energy storage unit based on its total capacity, charging ratio, health status, current remaining power, and charging ratio at full charge includes:

[0026] According to the formula Determine the remaining charging capacity of an energy storage unit;

[0027] Where soeC represents the remaining charging capacity of an energy storage unit, SOH represents the health status of an energy storage unit, Q represents the total capacity of an energy storage unit, and SOC represents the energy storage unit's total capacity. cf SOC represents the charging percentage of an energy storage unit when it is fully charged.

[0028] Optionally, determining the remaining discharge capacity of an energy storage unit based on its total capacity, charging ratio, health status, current remaining charge, and charging ratio in a fully discharged state includes:

[0029] According to the formula Determine the remaining discharge capacity of an energy storage unit;

[0030] Where soeDC represents the remaining discharge capacity of an energy storage unit, SOH represents the health status of an energy storage unit, and SOC represents the energy storage unit's energy storage status. dcfSOC represents the charging percentage of an energy storage unit when it is fully discharged.

[0031] Optionally, determining the theoretical charging power output value of an energy storage unit based on the remaining charging capacity and rated charging power of one energy storage unit and the remaining charging capacity of the plurality of energy storage units includes:

[0032] According to the formula Determine the theoretical charging power output value of an energy storage unit;

[0033] Among them, P ni SoeC represents the theoretical charging power output of an energy storage unit. i P represents the remaining charging capacity of an energy storage unit. 额 This represents the rated charging power of an energy storage unit. This represents the sum of the remaining charging capacities of the plurality of energy storage units.

[0034] Optionally, determining the theoretical discharge power output value of an energy storage unit based on the remaining discharge capacity and rated discharge power of an energy storage unit and the remaining discharge capacity of the plurality of energy storage units includes:

[0035] According to the formula Determine the theoretical discharge power output value of an energy storage unit;

[0036] Among them, P′ ni SOEDC represents the theoretical discharge power output of an energy storage unit. i P′ represents the remaining discharge capacity of an energy storage unit. 额 This represents the rated discharge power of an energy storage unit. This represents the sum of the remaining discharge capacities of the plurality of energy storage units.

[0037] Optional, also includes:

[0038] Receive scheduling instructions and adjust the power output value of each energy storage unit according to the scheduling instructions.

[0039] On the other hand, an energy storage system is provided, comprising:

[0040] At least one energy storage device, the energy storage device comprising at least one energy storage unit;

[0041] An output control device, one output control device connected to one energy storage device, the output control device being used to perform the method as described in the first aspect to control the power output value of the energy storage device.

[0042] Optionally, an energy storage unit includes at least one battery cluster and at least one energy storage converter, with one battery cluster connected to one energy storage converter.

[0043] Optional, also includes:

[0044] A management device is used to acquire external scheduling instructions and generate scheduling instructions for each output control device based on the external scheduling instructions, the maximum charging power and the maximum discharging power of each energy storage device, so that the output control device adjusts the power output value of each energy storage unit according to the scheduling instructions.

[0045] On the other hand, this application provides an output control device, including: a processor, and a memory communicatively connected to the processor;

[0046] The memory stores computer-executed instructions;

[0047] The processor executes computer execution instructions stored in the memory to implement the energy storage device control method as described in the first aspect.

[0048] A computer-readable storage medium storing computer-executable instructions that, when executed, cause a computer to perform as described in the first aspect.

[0049] A computer program product includes a computer program that, when executed by a processor, implements the energy storage device control method as described in the first aspect.

[0050] The method provided in the embodiments of this application obtains the maximum charging power and maximum discharging power of each energy storage unit in the energy storage device, and determines the maximum charging power and maximum discharging power of each energy storage device based on the maximum charging power and maximum discharging power of each energy storage unit. Then, based on the maximum charging power, maximum discharging power, rated charging power, and rated discharging power of the energy storage device, it controls the non-faulty energy storage units in the energy storage device to operate at their maximum charging power and maximum discharging power, or controls the energy storage device to stop operating. In this way, unified control of the operating power of the energy storage units is achieved, ensuring stable output power for each energy storage unit, and consequently, stable output power for the energy storage device. This avoids the problem of unstable power output in lithium battery energy storage systems that cannot adapt to actual usage scenarios. Attached Figure Description

[0051] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0052] Figure 1A schematic diagram of an energy storage system provided for one embodiment of this application;

[0053] Figure 2 A schematic diagram of an energy storage system provided for another embodiment of this application;

[0054] Figure 3 A schematic flowchart of an energy storage device control method provided in one embodiment of this application;

[0055] Figure 4 A schematic diagram of an output control device provided for one embodiment of this application.

[0056] Explanation of reference numerals in the attached figures:

[0057] Energy storage system 10

[0058] Energy storage device 100

[0059] Energy storage unit 110

[0060] Battery cluster 111

[0061] Energy storage converter 112

[0062] Output control device 200

[0063] Switch 20

[0064] Management device 300

[0065] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0066] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0067] In recent years, with the rapid development of the new energy vehicle market, the number of retired electric vehicle batteries has also been increasing. Retired batteries typically retain 70%-80% of their capacity. Simply discarding large quantities of retired batteries would not only impact the environment but also waste resources. Therefore, more and more companies are focusing on the reuse of retired batteries, especially transforming them into lithium-ion battery energy storage systems to power the grid or other systems.

[0068] However, after their initial use in electric vehicles, the degradation characteristics of retired batteries have changed to some extent, leading to poor consistency among retired batteries in reconstituted lithium-ion battery energy storage systems. This poor consistency results in imbalances in energy management of retired batteries and unstable power output of the lithium-ion battery energy storage system. Achieving stable and rapid control of the lithium-ion battery energy storage system to ensure stable power output remains a problem that needs to be solved.

[0069] Based on this, this application provides a control method and system for an energy storage device. The control method first obtains the maximum charging power and maximum discharging power of each energy storage unit in the energy storage device, and then determines the maximum charging power and maximum discharging power of the entire energy storage device based on the maximum charging power and maximum discharging power of each energy storage unit. Then, according to the maximum charging power, maximum discharging power, rated charging power, and rated discharging power of the energy storage device, it controls the non-faulty energy storage units in the energy storage device to operate at their maximum charging power and maximum discharging power, or controls the energy storage device to stop operating. Thus, the power output of each energy storage unit in the energy storage device can be uniformly controlled, thereby enabling uniform control of the power output of the entire energy storage device, achieving stable and rapid control of the energy storage device and the lithium battery energy storage system (containing multiple energy storage devices), and ensuring stable power output of both the energy storage device and the lithium battery energy storage system.

[0070] Please see Figure 1 One embodiment of this application provides an energy storage system 10, including at least one energy storage device 100 and an output control device 200. Figure 1 The battery energy management system (BEMS) shown is only one example of the output control device 200.

[0071] The energy storage device 100 includes at least one energy storage unit 110, which may include multiple batteries and may also include means for processing the current output from the batteries. For example, the energy storage unit 110 includes at least one battery cluster 111 and at least one energy storage converter 112, with one battery cluster 111 connected to one energy storage converter 112. The battery cluster 111 contains multiple retired batteries. The energy storage converter 112 is an AD / DC converter used to convert alternating current to direct current.

[0072] The energy storage converter 112 has a multi-branch topology. Each battery cluster 111 is physically connected to one branch of the energy storage converter 112 to form a multi-branch topology.

[0073] An output control device 200 is connected to an energy storage device 100. A switch 20 is also connected between the output control device 200 and the energy storage device 100. The switch 20 enables the output control device 200 to control the power output of the energy storage device 100. When controlling the power output of the energy storage device 100, the output control device 200 executes the energy storage device control method to manage the power output value of the energy storage device 100.

[0074] Optional, please see Figure 2 The energy storage system 10 also includes a management device 300. The output control device 200 monitors the operating data of the energy storage device 100 in real time and uploads it to the management device 300. The management device 300 is used to obtain external dispatch instructions and generate dispatch instructions for each output control device 200 based on the external dispatch instructions, the maximum charging power and the maximum discharging power of each energy storage device 100, so that the output control device 200 adjusts the power output value of each energy storage unit 110 according to the dispatch instructions.

[0075] The management device 300, as Figure 2 The energy management system (EMS) shown is illustrated. The management device 300 receives data such as... Figure 2 The management device 300 can monitor the maximum charge / discharge capacity of the energy storage device 100 by sending external dispatch commands to the external monitoring device 200, as shown. Upon receiving an external dispatch command, the management device 300 issues a dispatch command to the output control device 200 based on the maximum charge / discharge capacity of each energy storage device 100.

[0076] Optionally, the management device 300 and the external monitoring device communicate using the IEC 61850 standard, allowing the management device 300 to respond quickly to external dispatch commands. A switch is installed between the management device 300 and the output control device 200, and the management device 300 sends dispatch commands to the output control device 200 via a network cable using the IEC 61850 standard. The management device 300 can also achieve rapid coordinated control of the energy storage unit 110 and the energy storage converter 112. It can design scheduled charging and discharging strategies based on local peak and off-peak times and price differences, thereby reducing peak loads, increasing off-peak loads, smoothing the load curve, increasing load factor, reducing electricity demand, reducing investment, and ensuring stable grid operation.

[0077] Furthermore, the management device 300 can simultaneously monitor and control different types of energy storage systems (such as frequency regulation energy storage systems and peak regulation energy storage systems). It can not only optimize the operation status of retired batteries, but also ensure the scheduling response rate of the energy storage system 10, reduce the need for other controllers, and lower the cost of the energy storage system 10.

[0078] In summary, the energy storage system 10 provided in this embodiment can uniformly allocate the power output of the energy storage units 110 in the energy storage device 100, making the power output of the energy storage device 100 stable and controllable. Thus, stable and rapid control of the lithium battery energy storage system is achieved, resulting in stable power output of the lithium battery energy storage system.

[0079] The control method for the provided energy storage device is described in detail below.

[0080] Please see Figure 3 One embodiment of this application provides a control method for an energy storage device, applied to an output control device 200 connected to an energy storage device 100, wherein the energy storage device 100 includes a plurality of energy storage units 110. The method includes:

[0081] S310 obtains the maximum charging power and maximum discharging power of each energy storage unit.

[0082] By monitoring the operating data of each energy storage unit 110, the maximum charging power SOPci and the maximum discharging power SOPdci of each energy storage unit 110 can be obtained, where i represents the i-th energy storage unit 110.

[0083] S320: Determine the maximum charging power of the energy storage device based on the maximum charging power of each energy storage unit, and determine the maximum discharge power of the energy storage device based on the maximum discharge power of each energy storage unit.

[0084] Assuming an energy storage device 100 contains n energy storage units 110, then the maximum charging power of an energy storage device 100 is... The maximum discharge power of an energy storage device is 100.

[0085] S330, based on the maximum charging power, maximum discharging power, rated charging power, and rated discharging power of the energy storage device, control the non-faulty energy storage units in the energy storage device to operate at the maximum charging power and maximum discharging power, or control the energy storage device to stop operating.

[0086] Optionally, when the maximum charging power of the energy storage device 100 is equal to the rated charging power of the energy storage device 100, and the maximum discharging power of the energy storage device 100 is equal to the rated discharging power of the energy storage device 100, each energy storage unit 110 is controlled to operate at the maximum charging power and maximum discharging power of the energy storage unit 110.

[0087] Alternatively, when the maximum charging power of the energy storage device 100 is less than the rated charging power of the energy storage device 100, and / or when the maximum discharging power of the energy storage device 100 is less than the rated discharging power of the energy storage device 100, the energy storage device 100 is controlled to stop operating.

[0088] Alternatively, when the maximum charging power of the energy storage device 100 exceeds its rated charging power, and / or the maximum discharging power exceeds its rated discharging power, the number of faulty energy storage units in the energy storage device 100 is obtained, and when the number of faulty energy storage units in the energy storage device 100 exceeds a preset number, the energy storage device 100 is controlled to stop operation. The output control device 200 can monitor the status and parameters of each energy storage unit 110 in real time, i.e., the status and parameters of the battery cluster BCMS and the energy storage converter module AC / DC in each energy storage unit 110, and determine whether the energy storage unit 110 is in a normal or faulty state based on the status and parameters. When the number of faulty energy storage units in the energy storage device 100 exceeds a preset number, the energy storage device 100 is controlled to stop operation.

[0089] Optionally, after identifying a faulty energy storage unit 110, the output control device 200 can implement a redundancy control strategy for the branch fault device, that is, promptly disconnect the output of the faulty energy storage unit 110 to ensure the normal operation of other energy storage units 110, thereby improving the power support stability of the energy storage system 10. The output control device 200 can monitor the status and parameters of each energy storage unit 110 in real time, that is, the status and parameters of the battery cluster BCMS and the energy storage converter module AC / DC in each energy storage unit 110, and determine whether the energy storage unit 110 is normal or faulty based on the status and parameters.

[0090] When the number of faulty energy storage units is less than or equal to the preset number, the output control device 200 acquires the total capacity Q, charging ratio SOC, health status SOH, current remaining capacity SOE, charging ratio SOCcf in full charge state, charging ratio SOCdcf in full discharge state, and rated charging power P of each energy storage unit 110. 额 and rated discharge power P' 额 .

[0091] Then, based on the total capacity Q, charging ratio SOC, health status SOH, current remaining capacity SOE, full charge state charging ratio SOCcf, and rated charging power P of each energy storage unit 110, 额 Determine the theoretical charging power output value P for each energy storage unit 110. ni Based on the total capacity Q, charge ratio SOC, health status SOH, current remaining capacity SOE, charge ratio SOCdcf in full discharge state, and rated discharge power P' of each energy storage unit 110. 额 Determine the theoretical discharge power output value P' of each energy storage unit 110. ni When the maximum charging power SOPci of an energy storage unit 110 is less than the theoretical charging power output value P ni And / or, the maximum discharge power SOPdci of an energy storage unit 110 is less than the theoretical discharge power output value P' ni At that time, one energy storage unit 110 is controlled to operate at the maximum charging power SOPci and the maximum discharging power SOPdci of the energy storage unit 110, wherein one energy storage unit 110 is a non-faulty energy storage unit 110.

[0092] Based on the total capacity Q, charging ratio SOC, health status SOH, current remaining capacity SOE, full charge state charging ratio SOCcf, and rated charging power P of each energy storage unit 110 额 Determine the theoretical charging power output value P for each energy storage unit 110. niFirst, based on the total capacity Q, charging ratio SOC, health status SOH, current remaining capacity SOE, and charging ratio SOCcf of a full-charge state, the remaining charging capacity soeC of an energy storage unit 110 is determined. Then, based on the remaining charging capacity soeC and rated charging power P of an energy storage unit 110... 额 Based on the remaining charging capacity of the multiple energy storage units 110, determine the theoretical charging power output value P of one energy storage unit 110. ni .

[0093] Specifically, according to the formula Determine the remaining charging capacity of an energy storage unit 110. Here, soeC represents the remaining charging capacity of an energy storage unit 110, SOH represents the health status of an energy storage unit 110, Q represents the total capacity of an energy storage unit 110, and SOC represents the remaining charging capacity of an energy storage unit 110. cf This represents the charging percentage of a single energy storage unit 110 in its fully charged state, while SOC represents the charging percentage of a single energy storage unit 110. Then, according to the formula... Determine the theoretical charging power output value of an energy storage unit 110. Wherein, P ni This represents the theoretical charging power output value of an energy storage unit 110, soC i P represents the remaining charging capacity of an energy storage unit 110. 额 This represents the rated charging power of an energy storage unit 110. This represents the sum of the remaining charging capacity of the plurality of energy storage units 110.

[0094] Based on the total capacity Q, charging ratio SOC, health status SOH, current remaining capacity SOE, charging ratio SOCdcf in full discharge state, and rated discharge power P' of each energy storage unit 110. 额 Determine the theoretical discharge power output value P' of each energy storage unit 110. ni First, based on the total capacity Q, charging ratio SOC, health status SOH, current remaining capacity SOE, and charging ratio SOCdcf of a fully discharged state, the remaining discharge capacity soeDC of an energy storage unit 110 is determined. Then, based on the remaining discharge capacity soeDC and rated discharge power P' of an energy storage unit 110... 额 Based on the remaining discharge capacity of the multiple energy storage units 110, the theoretical discharge power output value of one energy storage unit 110 is determined.

[0095] Specifically, according to the formula Determine the remaining discharge capacity of an energy storage unit 110. Here, soeDC represents the remaining discharge capacity of an energy storage unit 110, SOH represents the health status of an energy storage unit 110, and SOC represents the remaining discharge capacity of an energy storage unit 110. dcfThe charge percentage represents the fully discharged state of an energy storage unit 110, and the State of Charge (SOC) represents the charge percentage of an energy storage unit 110. Then, according to the formula... Determine the theoretical charging power output value of an energy storage unit 110. Wherein, P ni This represents the theoretical charging power output value of an energy storage unit 110, soC i P represents the remaining charging capacity of an energy storage unit 110. 额 This represents the rated charging power of an energy storage unit 110. This represents the sum of the remaining charging capacity of the plurality of energy storage units 110.

[0096] Optionally, the output control device 200 can also receive dispatch instructions and adjust the power output value of each energy storage unit 110 according to the dispatch instructions. The dispatch instructions are generated by the management device 300 based on external dispatch instructions, the maximum charging power and maximum discharging power of each energy storage device 100. By sending dispatch instructions from the management device 300 to the output control device 200, rapid coordinated control of the energy storage unit 110 and the energy storage converter 112 can be achieved. Scheduled charging and discharging strategies can be designed based on local peak and off-peak periods and price differences, thereby reducing peak load on the power grid, increasing off-peak load, smoothing the load curve, increasing load factor, reducing power load demand, reducing investment, and ensuring stable grid operation.

[0097] In summary, the method provided in this embodiment can uniformly manage and allocate the power output of each energy storage unit 110 in the energy storage device 100, making the power output of the energy storage device 100 stable and controllable. Thus, stable and rapid control of the lithium battery energy storage system is achieved, ensuring stable power output of the lithium battery energy storage system.

[0098] Please see Figure 4 This application also provides an output control device 200, including a processor 210 and a memory 220 communicatively connected to the processor. The memory 220 stores computer-executable instructions, and the processor 210 executes the computer-executable instructions stored in the memory 220 to implement the energy storage device control method as described in any of the preceding embodiments.

[0099] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed, cause the computer-executable instructions to be executed by a processor to implement the energy storage device control method provided in any of the preceding embodiments.

[0100] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the energy storage device control method as provided in any of the preceding embodiments.

[0101] It should be noted that the aforementioned computer-readable storage media can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), magnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM), etc. It can also be various electronic devices that include one or any combination of the above-mentioned memories, such as mobile phones, computers, tablet devices, personal digital assistants, etc.

[0102] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0103] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0104] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0105] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0106] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0107] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0108] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A control method for an energy storage device, characterized in that, The method is applied to an output control device, which is connected to an energy storage device, wherein one energy storage device includes multiple energy storage units; the method includes: Obtain the maximum charging power and maximum discharging power of each energy storage unit; The maximum charging power of the energy storage device is determined based on the maximum charging power of each energy storage unit, and the maximum discharge power of the energy storage device is determined based on the maximum discharge power of each energy storage unit. Based on the maximum charging power, maximum discharging power, rated charging power, and rated discharging power of the energy storage device, control the non-faulty energy storage units in the energy storage device to operate at the maximum charging power and maximum discharging power, or control the energy storage device to stop operating. The step of controlling the non-faulty energy storage units in the energy storage device to operate at maximum charging and discharging power, or controlling the energy storage device to stop operating, based on the maximum charging power, maximum discharging power, rated charging power, and rated discharging power of the energy storage device, includes: When the maximum charging power of the energy storage device is equal to the rated charging power of the energy storage device, and the maximum discharging power of the energy storage device is equal to the rated discharging power of the energy storage device, each energy storage unit is controlled to operate at the maximum charging power and maximum discharging power of the energy storage unit. When the maximum charging power of the energy storage device is greater than the rated charging power of the energy storage device, and / or the maximum discharging power of the energy storage device is greater than the rated discharging power of the energy storage device, the number of faulty energy storage units in the energy storage device is obtained, and when the number of faulty energy storage units in the energy storage device is greater than a preset number, the energy storage device is controlled to stop operating. When the maximum charging power of the energy storage device is less than the rated charging power of the energy storage device, and / or when the maximum discharging power of the energy storage device is less than the rated discharging power of the energy storage device, the energy storage device is controlled to stop operating.

2. The method according to claim 1, characterized in that, Also includes: When the number of faulty energy storage units is less than or equal to the preset number, the total capacity, charging ratio, health status, current remaining power, charging ratio in full charge state, charging ratio in full discharge state, rated charging power and rated discharging power of each energy storage unit are obtained. The theoretical charging power output value of each energy storage unit is determined based on its total capacity, charging ratio, health status, current remaining power, charging ratio at full charge, and rated charging power. The theoretical discharge power output value of each energy storage unit is determined based on its total capacity, charging ratio, health status, current remaining power, charging ratio in full discharge state, and rated discharge power. When the maximum charging power of an energy storage unit is less than the theoretical charging power output value, and / or the maximum discharging power of an energy storage unit is less than the theoretical discharging power output value, an energy storage unit is controlled to operate at the maximum charging power and maximum discharging power of the energy storage unit, wherein the energy storage unit is a non-faulty energy storage unit.

3. The method according to claim 2, characterized in that, The determination of the theoretical charging power output value for each energy storage unit, based on its total capacity, charging ratio, health status, current remaining power, charging ratio at full charge, and rated charging power, includes: The remaining charging capacity of an energy storage unit is determined based on its total capacity, charging ratio, health status, current remaining power, and charging ratio at full charge. The theoretical charging power output value of an energy storage unit is determined based on the remaining charging capacity and rated charging power of an energy storage unit and the remaining charging capacity of the plurality of energy storage units. The determination of the theoretical discharge power output value for each energy storage unit, based on its total capacity, charging ratio, health status, current remaining power, charging ratio at full discharge, and rated discharge power, includes: The remaining discharge capacity of an energy storage unit is determined based on its total capacity, charging ratio, health status, current remaining capacity, and charging ratio in a fully discharged state. The theoretical discharge power output value of an energy storage unit is determined based on the remaining discharge capacity and rated discharge power of an energy storage unit and the remaining discharge capacity of the plurality of energy storage units.

4. The method according to claim 3, characterized in that, The determination of the remaining charging capacity of an energy storage unit based on its total capacity, charging ratio, health status, current remaining power, and charging ratio at full charge includes: According to the formula Determine the remaining charging capacity of an energy storage unit; in, This represents the remaining charging capacity of an energy storage unit. This represents the health status of an energy storage unit. Represents the total capacity of an energy storage unit. This represents the charging percentage of a fully charged energy storage unit. This represents the charging ratio of an energy storage unit.

5. The method according to claim 3, characterized in that, The determination of the remaining discharge capacity of an energy storage unit based on its total capacity, charging ratio, health status, current remaining capacity, and charging ratio in a fully discharged state includes: According to the formula Determine the remaining discharge capacity of an energy storage unit; in, This represents the remaining discharge capacity of an energy storage unit. This represents the health status of an energy storage unit. This represents the charging percentage of a fully charged energy storage unit. This represents the charging ratio of an energy storage unit.

6. The method according to claim 3, characterized in that, Determining the theoretical charging power output value of an energy storage unit based on its remaining charging capacity, rated charging power, and the remaining charging capacity of the plurality of energy storage units includes: According to the formula Determine the theoretical charging power output value of an energy storage unit; in, This represents the theoretical charging power output value of an energy storage unit. This represents the remaining charging capacity of an energy storage unit. This represents the rated charging power of an energy storage unit. This represents the sum of the remaining charging capacities of the plurality of energy storage units.

7. The method according to claim 3, characterized in that, The step of determining the theoretical discharge power output value of an energy storage unit based on its remaining discharge capacity, rated discharge power, and the remaining discharge capacity of the plurality of energy storage units includes: According to the formula Determine the theoretical discharge power output value of an energy storage unit; in, This represents the theoretical discharge power output value of an energy storage unit. This represents the remaining discharge capacity of an energy storage unit. This represents the rated discharge power of an energy storage unit. This represents the sum of the remaining discharge capacities of the plurality of energy storage units.

8. The method according to any one of claims 1-7, characterized in that, Also includes: Receive scheduling instructions and adjust the power output value of each energy storage unit according to the scheduling instructions.

9. An energy storage system, characterized in that, include: At least one energy storage device, the energy storage device comprising at least one energy storage unit; An output control device, one output control device connected to an energy storage device, the output control device being used to perform the method as described in any one of claims 1-8 to control the power output value of the energy storage device.

10. The energy storage system according to claim 9, characterized in that, An energy storage unit includes at least one battery cluster and at least one energy storage converter, with one battery cluster connected to one energy storage converter.

11. The energy storage system according to claim 9, characterized in that, Also includes: A management device is used to acquire external scheduling instructions and generate scheduling instructions for each output control device based on the external scheduling instructions, the maximum charging power and the maximum discharging power of each energy storage device, so that the output control device adjusts the power output value of each energy storage unit according to the scheduling instructions.

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