A method and device for managing an energy storage system, an energy storage system, and a storage medium

Abstract

The present application provides a management method, device, energy storage system and storage medium for an energy storage system. The method includes: obtaining the cell state data of each energy storage unit in the current energy storage system; wherein, the cell state data represents the performance state of each cell in the energy storage unit; determining the maximum output power of each energy storage unit according to the cell state data of each energy storage unit; for each energy storage unit, determining the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit; determining the target output power of each energy storage unit according to the actual output power of each energy storage unit and the current load power demand, so that each energy storage unit outputs electric energy according to the target output power. Abnormal energy storage units are avoided from affecting the energy storage system to perform the electric energy output task, task coordination and distribution among multiple energy storage units are realized, and the stability of the output power of the entire energy storage system is improved.

Description

Technical Field

[0001] This application relates to the technical field of energy management, and particularly to a method and device for managing an energy storage system, an energy storage system, and a storage medium. Background Art

[0002] Currently, the power demand of products such as electric vehicles is increasing day by day, which promotes the innovation and development of battery energy storage technology.

[0003] In the prior art, battery energy storage technology generally adopts the method of connecting batteries in series and then in parallel. Multiple battery packs are connected in parallel to form an energy storage unit, and an energy storage system includes multiple energy storage units. The energy storage units are directly connected to the DC bus of a high-power converter, and the energy storage unit is used as the minimum unit for electric energy output to output electric energy.

[0004] However, during the use of the energy storage system, abnormalities such as a decrease in the performance of the battery cells inside the energy storage unit may occur, which will affect the electric energy output of the energy storage unit at this time, and thus the stability of the output power of the entire energy storage system cannot be guaranteed. Summary of the Invention

[0005] This application provides a method and device for managing an energy storage system, an energy storage system, and a storage medium to solve the defects in the prior art that the stability of the output power of the entire energy storage system cannot be guaranteed.

[0006] The first aspect of this application provides a method for managing an energy storage system, including:

[0007] Obtain the cell state data of each energy storage unit in the current energy storage system; wherein, the cell state data characterizes the performance state of each cell in the energy storage unit;

[0008] Determine the maximum output power of each energy storage unit according to the cell state data of each energy storage unit;

[0009] For each energy storage unit, determine the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit;

[0010] Determine the target output power of each energy storage unit according to the actual output power of each energy storage unit and the current load power demand, so that each energy storage unit outputs electric energy according to the target output power.

[0011] Optionally, the determining the maximum output power of each energy storage unit according to the cell state data of each energy storage unit includes:

[0012] For each energy storage unit, fit an electric energy curve for the energy storage unit according to the cell state data of the energy storage unit;

[0013] Determine the maximum output power of the energy storage unit according to the peak output power characterized by the power curve of the energy storage unit.

[0014] Optionally, the fitting of the power curve for the energy storage unit according to the cell state data of the energy storage unit includes:

[0015] Determine the remaining power of the energy storage unit according to the cell state information of the energy storage unit;

[0016] Fit a power curve for the energy storage unit according to the correlation between the remaining power of the energy storage unit and the cell state information.

[0017] Optionally, the determining of the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit includes:

[0018] Determine the maximum output power that the DC converter can carry according to the maximum output voltage of the DC converter coupled to the energy storage unit;

[0019] When the maximum output power of the energy storage unit is not greater than the maximum output power that the DC converter can carry, determine the maximum output power of the energy storage unit as the actual output power of the energy storage unit.

[0020] Optionally, it further includes:

[0021] When the maximum output power of the energy storage unit is greater than the maximum output power that the DC converter can carry, determine the maximum output power that the DC converter can carry as the actual output power of the energy storage unit.

[0022] Optionally, it further includes:

[0023] Obtain the self-state information of the AC-DC converter connected to all the DC converters;

[0024] Determine the power loss of the AC-DC converter according to the self-state information of the AC-DC converter;

[0025] Determine the current load power demand according to the original load power demand and the power loss of the AC-DC converter itself.

[0026] Optionally, the cell state information includes at least the individual voltage and temperature of each cell.

[0027] The second aspect of the present application provides an energy storage system management device, including:

[0028] An acquisition module for acquiring the cell state data of each energy storage unit in the current energy storage system; wherein, the cell state data characterizes the performance states of the cells in the energy storage unit.

[0029] A first determination module for determining the maximum output power of each energy storage unit according to the cell state data of each energy storage unit.

[0030] A second determination module for, for each energy storage unit, determining the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit.

[0031] A management module for determining the target output power of each energy storage unit according to the actual output power of each energy storage unit and the current load power demand, so that each energy storage unit outputs electric energy according to the target output power.

[0032] Optionally, the first determination module is specifically configured to:

[0033] For each energy storage unit, fitting an electric energy curve for the energy storage unit according to the cell state data of the energy storage unit.

[0034] Determining the maximum output power of the energy storage unit according to the output power peak represented by the electric energy curve of the energy storage unit.

[0035] Optionally, the first determination module is specifically configured to:

[0036] Determining the remaining power of the energy storage unit according to the cell state information of the energy storage unit.

[0037] Fitting an electric energy curve for the energy storage unit according to the correlation between the remaining power of the energy storage unit and the cell state information.

[0038] Optionally, the second determination module is specifically configured to:

[0039] Determining the maximum output power that the DC converter can carry according to the maximum output voltage of the DC converter coupled to the energy storage unit.

[0040] When the maximum output power of the energy storage unit is not greater than the maximum output power that the DC converter can carry, determining the maximum output power of the energy storage unit as the actual output power of the energy storage unit.

[0041] Optionally, the second determination module is further configured to:

[0042] When the maximum output power of the energy storage unit is greater than the maximum output power that the DC converter can bear, the maximum output power that the DC converter can bear is determined as the actual output power of the energy storage unit.

[0043] Optionally, the device further includes:

[0044] A third determination module, configured to obtain the self-state information of the AC-DC converter connected to all the DC converters; determine the power loss of the AC-DC converter according to the self-state information of the AC-DC converter; and determine the current load power demand according to the original load power demand and the power loss of the AC-DC converter itself.

[0045] Optionally, the cell state information at least includes the single-cell voltage and temperature of each cell.

[0046] A third aspect of the present application provides an energy storage system, including: a plurality of energy storage units, a high-voltage box, a DC converter coupled to a single energy storage unit, an AC-DC converter connected to all the DC converters, at least one processor, and a memory; wherein, the energy storage unit includes a plurality of cells, and a cell data acquisition device is provided on each cell;

[0047] The high-voltage box is used to provide a hardware interface for the plurality of energy storage units to be connected in series and then connected to the DC converter;

[0048] The DC converter is used to stably output the dynamic DC voltage of the energy storage unit;

[0049] The AC-DC converter is used to convert DC electrical energy into AC electrical energy;

[0050] The cell data acquisition device is used to acquire the cell state information and send the acquired information to the at least one processor;

[0051] The memory stores computer execution instructions;

[0052] The at least one processor executes the computer execution instructions stored in the memory, so that the at least one processor executes the method described in the first aspect and various possible designs of the first aspect as above.

[0053] A fourth aspect of the present application provides a computer-readable storage medium, in which computer execution instructions are stored. When a processor executes the computer execution instructions, the method described in the first aspect and various possible designs of the first aspect as above is implemented.

[0054] The technical solution of the present application has the following advantages:

[0055] The present application provides a method and apparatus for managing an energy storage system, an energy storage system, and a storage medium. The method includes: obtaining the cell state data of each energy storage unit in the current energy storage system; where the cell state data characterizes the performance state of each cell in the energy storage unit; determining the maximum output power of each energy storage unit according to the cell state data of each energy storage unit; for each energy storage unit, determining the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit; and determining the target output power of each energy storage unit according to the actual output power of each energy storage unit and the current load power demand, so that each energy storage unit outputs electrical energy according to the target output power. The method provided by the above solution determines the actual output power that each energy storage unit can achieve by combining the cell state data of each energy storage unit and the maximum output voltage of the corresponding DC converter, and then assigns the corresponding electrical energy output task of the target output power to it, so as to avoid abnormal energy storage units from affecting the energy storage system to execute the electrical energy output task, realizing the coordinated allocation of tasks among multiple energy storage units and improving the stability of the output power of the entire energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0057] Figure 1 It is a schematic structural diagram of an energy storage system management system based on an embodiment of the present application;

[0058] Figure 2 It is a schematic flowchart of the energy storage system management method provided by an embodiment of the present application;

[0059] Figure 3 It is a schematic structural diagram of the energy storage system management device provided by an embodiment of the present application;

[0060] Figure 4 It is a schematic structural diagram of the energy storage system provided by an embodiment of the present application;

[0061] Figure 5 It is a schematic structural diagram of an exemplary energy storage system provided by an embodiment of the present application.

[0062] Through the above drawings, the clear embodiments of the present application have been shown, and there will be more detailed descriptions later. These drawings and text descriptions are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0063] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0064] In addition, terms such as "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the following embodiments, "a plurality of" means two or more unless otherwise specifically defined.

[0065] In the prior art, battery energy storage technology generally adopts the method of connecting batteries in series into groups and then in parallel. Multiple battery groups are connected in parallel to form an energy storage unit, and an energy storage system includes multiple energy storage units. The energy storage units are directly connected to the DC bus of a high-power converter, and the energy storage unit is used as the minimum unit for power output to output electric energy. However, during the use of the energy storage system, abnormalities such as a decrease in the performance of the battery cells may occur inside the batteries of the energy storage units. At this time, the power output of the energy storage unit will be affected, and thus the stability of the power output of the entire energy storage system cannot be guaranteed.

[0066] In response to the above problems, the energy storage system management method, device, energy storage system, and storage medium provided by the embodiments of this application obtain the cell state data of each energy storage unit in the current energy storage system; where the cell state data characterizes the performance state of each cell in the energy storage unit; determine the maximum output power of each energy storage unit according to the cell state data of each energy storage unit; for each energy storage unit, determine the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit; determine the target output power of each energy storage unit according to the actual output power of each energy storage unit and the current load power demand, so that each energy storage unit outputs electric energy according to the target output power. The method provided by the above solution determines the actual output power that each energy storage unit can achieve by combining the cell state data of each energy storage unit and the maximum output voltage of the corresponding DC converter, and then assigns the corresponding electric energy output task of the target output power to it, so as to avoid abnormal energy storage units from affecting the energy storage system's execution of the electric energy output task, realizing the coordinated allocation of tasks between multiple energy storage units and improving the stability of the power output of the entire energy storage system.

[0067] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0068] First, the structure of the energy storage system management system on which this application is based will be described:

[0069] The energy storage system management method, device, energy storage system, and storage medium provided by the embodiments of this application are applicable to managing the power output of each energy storage unit in the energy storage system. As Figure 1 shown, it is a schematic structural diagram of the energy storage system management system based on the embodiments of this application, mainly including an energy storage system, a data acquisition device, and an energy storage system management device for managing the energy storage system. Among them, the energy storage system includes multiple energy storage units. Specifically, based on the data acquisition device collecting the cell state data of each energy storage unit in the current energy storage system, and then sending the collected cell state data to the energy storage system management device, the energy storage system management device manages the power output of each energy storage unit according to the obtained data.

[0070] The embodiments of this application provide an energy storage system management method for managing the power output of each energy storage unit in the energy storage system. The execution subject of the embodiments of this application is an electronic device, such as a server, a desktop computer, a laptop computer, a tablet computer, and other electronic devices that can be used for power management of the energy storage system.

[0071] As Figure 2 shown, it is a schematic flowchart of the energy storage system management method provided by the embodiments of this application. The method includes:

[0072] Step 201, obtain the cell state data of each energy storage unit in the current energy storage system.

[0073] Among them, the cell state data characterizes the performance state of each cell in the energy storage unit.

[0074] Step 202, determine the maximum output power of each energy storage unit according to the cell state data of each energy storage unit.

[0075] Among them, the cell state data at least includes the single-cell voltage and temperature of each cell.

[0076] Specifically, for each energy storage unit, its internal cell performance can be determined according to its cell state data, and then the maximum output power of the energy storage unit can be determined according to the influence relationship between the cell performance and the maximum output power.

[0077] Step 203, for each energy storage unit, determine the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit.

[0078] It should be noted that the DC converter can be a bidirectional DC current transformer, which is used to stably output the electrical energy of the energy storage unit. That is, the energy storage unit achieves electrical energy output based on the DC current transformer. Therefore, the actual output power that the energy storage unit can achieve is limited not only by the maximum output power of the energy storage unit, but also by the maximum output voltage of the DC converter coupled to the energy storage unit.

[0079] Specifically, in one embodiment, the maximum output power that the DC converter can bear can be determined based on the maximum output voltage of the DC converter coupled to the energy storage unit; when the maximum output power of the energy storage unit is not greater than the maximum output power that the DC converter can bear, the maximum output power of the energy storage unit is determined as the actual output power of the energy storage unit.

[0080] Among them, the correspondence between the maximum output voltage of the DC converter and the maximum output power it can carry can be determined according to the model and configuration parameters of the DC converter. The specific determination process can refer to the existing technology and is not limited in the embodiments of this application.

[0081] Accordingly, in one embodiment, when the maximum output power of the energy storage unit is greater than the maximum output power that the DC converter can bear, the maximum output power that the DC converter can bear is determined as the actual output power of the energy storage unit.

[0082] Specifically, when the maximum output power of the energy storage unit exceeds the maximum output power that the DC converter can bear, it can be determined that the DC converter cannot achieve the electrical energy output of the maximum output power. Therefore, in order to ensure the safety of the energy storage system, the maximum output power that the current DC converter can bear can be determined as the actual output power of the energy storage unit.

[0083] Step 204 : determining the target output power of each energy storage unit according to the actual output power of each energy storage unit and the current load power demand, so that each energy storage unit outputs electric energy according to the target output power.

[0084] Specifically, the maximum output power of the energy storage system can be determined based on the actual output power of all energy storage units. When the maximum output power of the energy storage system is sufficient to meet the current load power demand, the target output power required for each energy storage unit to meet the current load can be determined based on the actual output power of each energy storage unit, thereby allocating power output tasks to each energy storage unit. Conversely, when the maximum output power of the energy storage system is insufficient to meet the current load power demand, the actual output power of each energy storage unit can be directly determined as the target output power to achieve maximum discharge of the energy storage system and meet the product's load power demand as much as possible.

[0085] Specifically, the target output power of each energy storage unit can be dynamically adjusted based on a DC converter, which can be specifically implemented based on internal regulators of the DC converter, such as a PI regulator and a hysteresis regulator.

[0086] Based on the above embodiments, as an implementable manner, based on the above embodiments, in one embodiment, determining the maximum output power of each energy storage unit according to the cell state data of each energy storage unit includes:

[0087] Step 2021, for each energy storage unit, fitting an electric energy curve for the energy storage unit according to the cell state data of the energy storage unit;

[0088] Step 2022, determining the maximum output power of the energy storage unit according to the output power peak characterized by the electric energy curve of the energy storage unit.

[0089] Among them, the fitted electric energy curve reflects the corresponding relationship between the output power of the energy storage unit and the cell state information, and specifically, an electric energy curve (current curve) fitting tool can be used to fit an electric energy curve for the energy storage unit according to the cell state data of the energy storage unit.

[0090] Exemplarily, when the cell state information includes temperature and single-cell voltage, the electric energy curve is a three-dimensional curve of temperature-single-cell voltage-output power.

[0091] Specifically, in one embodiment, the remaining power of the energy storage unit can be determined according to the cell state information of the energy storage unit; an electric energy curve is fitted for the energy storage unit according to the correlation between the remaining power of the energy storage unit and the cell state information.

[0092] Specifically, in order to improve the detection accuracy of the remaining power, based on the state of charge (SOC) estimation technology, the least squares method and the Kalman filtering algorithm can be coupled, combined with battery characteristic static open circuit voltage (ocv), dynamic ocv, and inductance (DCR) internal resistance estimation technologies to determine the remaining power of the energy storage unit according to the cell state information of the energy storage unit. Then, an electric energy curve is fitted for the energy storage unit according to the correlation between the remaining power of the energy storage unit characterized by the calculation result and the cell state information.

[0093] Based on the above embodiments, in order to further ensure that the output power of the energy storage system can meet the load power requirements of the product, as an implementable manner, based on the above embodiments, in one embodiment, the method further includes:

[0094] Step 301, obtaining the self-state information of the AC-DC converter connected to all DC converters;

[0095] Step 302: Determine the power loss of the AC-DC converter according to the self-state information of the AC-DC converter.

[0096] Step 303: Determine the current load power demand according to the original load power demand and the power loss of the AC-DC converter itself.

[0097] Among them, the self-state information of the AC-DC converter includes at least the current temperature of the AC-DC converter.

[0098] Specifically, according to the self-state information of the AC-DC converter, the current power transmission performance of the AC-DC converter can be estimated, and then the power loss of the AC-DC converter can be determined. Then, the power loss is superimposed on the original load power demand to obtain the current load power demand that the energy storage system needs to meet, so as to ensure that the electric energy actually output by the energy storage unit can meet the actual needs of the current product.

[0099] The energy storage system management method provided by the embodiments of the present application obtains the cell state data of each energy storage unit in the current energy storage system; among them, the cell state data characterizes the performance state of each cell in the energy storage unit; according to the cell state data of each energy storage unit, determine the maximum output power of each energy storage unit; for each energy storage unit, determine the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit; according to the actual output power of each energy storage unit and the current load power demand, determine the target output power of each energy storage unit, so that each energy storage unit outputs electric energy according to the target output power. The method provided by the above solution determines the actual output power that each energy storage unit can achieve by combining the cell state data of each energy storage unit and the maximum output voltage of the corresponding DC converter, and then assigns the corresponding target output power power output task to avoid abnormal energy storage units from affecting the energy storage system to execute the power output task, realizing the coordinated distribution of tasks among multiple energy storage units, and also realizing the closed-loop regulation of the energy storage unit, improving the stability of the output power of the entire energy storage system. And, by determining the current load power demand according to the original load power demand and the power loss of the AC-DC converter itself, the reliability of the energy storage system in power supply is ensured.

[0100] The embodiments of the present application provide an energy storage system management device for executing the energy storage system management method provided by the above embodiments.

[0101] As Figure 3 shown, it is a schematic structural diagram of the energy storage system management device provided by the embodiments of the present application. The energy storage system management device 30 includes: an acquisition module 301, a first determination module 302, a second determination module 303, and a management module 304.

[0102] Among them, the acquisition module is used to acquire the cell state data of each energy storage unit in the current energy storage system; wherein, the cell state data characterizes the performance state of each cell in the energy storage unit; the first determination module is used to determine the maximum output power of each energy storage unit according to the cell state data of each energy storage unit; the second determination module is used to determine the actual output power of each energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit for each energy storage unit; the management module is used to determine the target output power of each energy storage unit according to the actual output power of each energy storage unit and the current load power demand, so that each energy storage unit outputs electric energy according to the target output power.

[0103] Specifically, in one embodiment, the first determination module is specifically used for:

[0104] For each energy storage unit, according to the cell state data of the energy storage unit, fit an electric energy curve for the energy storage unit;

[0105] Determine the maximum output power of the energy storage unit according to the output power peak represented by the electric energy curve of the energy storage unit.

[0106] Specifically, in one embodiment, the first determination module is specifically used for:

[0107] Determine the remaining power of the energy storage unit according to the cell state information of the energy storage unit;

[0108] Fit an electric energy curve for the energy storage unit according to the correlation between the remaining power of the energy storage unit and the cell state information.

[0109] Specifically, in one embodiment, the second determination module is specifically used for:

[0110] Determine the maximum output power that the DC converter can carry according to the maximum output voltage of the DC converter coupled to the energy storage unit;

[0111] When the maximum output power of the energy storage unit is not greater than the maximum output power that the DC converter can carry, determine the maximum output power of the energy storage unit as the actual output power of the energy storage unit.

[0112] Specifically, in one embodiment, the second determination module is further used for:

[0113] When the maximum output power of the energy storage unit is greater than the maximum output power that the DC converter can carry, determine the maximum output power that the DC converter can carry as the actual output power of the energy storage unit.

[0114] Specifically, in one embodiment, the device further includes:

[0115] A third determination module is configured to obtain the self-state information of the AC-DC converter connected to all DC converters; determine the power loss of the AC-DC converter according to the self-state information of the AC-DC converter; and determine the current load power demand according to the original load power demand and the power loss of the AC-DC converter itself.

[0116] Specifically, in one embodiment, the cell state information at least includes the individual voltage and temperature of each cell.

[0117] Regarding the energy storage system management device in this embodiment, the specific manners in which each module performs operations have been described in detail in the embodiments related to the method, and will not be elaborated herein.

[0118] The energy storage system management device provided by the embodiments of the present application is used to execute the energy storage system management method provided by the above embodiments. The implementation manner and principle are the same and will not be repeated.

[0119] The embodiments of the present application provide an energy storage system for executing the energy storage system management method provided by the above embodiments.

[0120] As Figure 4 shown, it is a schematic structural diagram of the energy storage system provided by the embodiments of the present application. The energy storage system 40 includes: a plurality of energy storage units 401, a high-voltage box 402, a DC converter 403 coupled to a single energy storage unit, an AC-DC converter 404 connected to all DC converters, at least one processor 405, and a memory 406; wherein, the energy storage unit 401 includes a plurality of cells, and each cell is provided with a cell data acquisition device;

[0121] Among them, the high-voltage box is used to provide a hardware interface for connecting the plurality of energy storage units in series to the DC converter; the DC converter is used to stably output the dynamic DC voltage of the energy storage unit; the AC-DC converter is used to convert DC electrical energy into AC electrical energy; the cell data acquisition device is used to acquire cell state information and send the acquired information to at least one processor; the memory stores computer execution instructions; at least one processor executes the computer execution instructions stored in the memory, so that at least one processor executes the energy storage system management method provided by the above embodiments.

[0122] Exemplarily, as Figure 5 shown, it is a schematic structural diagram of the exemplary energy storage system provided by the embodiments of the present application, Figure 5In this, 1 represents a battery cell, 2 represents a battery cell data acquisition device, which can also be referred to as a battery cell data acquisition controller, 3 represents a high-voltage box, 4 represents a energy storage unit data acquisition device, 5 represents a DC-DC converter, specifically a bidirectional DC-DC converter, 6 represents an AC-DC converter, specifically a bidirectional AC-DC converter, 7 represents a processor, which can also be called a central controller. The power line is used to transmit electric energy, and the communication line is used to transmit communication data, such as battery cell state data and control instructions, etc. As Figure 5 The energy storage system shown specifically is as Figure 4 shown in an exemplary implementation manner of the energy storage system. The implementation principles of the two are the same and will not be elaborated here.

[0123] An energy storage system provided by an embodiment of the present application is used to execute the energy storage system management method provided by the above embodiment. Its implementation manner and principle are the same and will not be elaborated here.

[0124] An embodiment of the present application provides a computer-readable storage medium. Computer-executable instructions are stored in the computer-readable storage medium. When the processor executes the computer-executable instructions, the energy storage system management method provided by any one of the above embodiments is implemented.

[0125] The storage medium containing computer-executable instructions in an embodiment of the present application can be used to store the computer-executable instructions of the energy storage system management method provided in the foregoing embodiments. Its implementation manner and principle are the same and will not be elaborated here.

[0126] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the devices or units can be in an electrical, mechanical or other form.

[0127] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0128] In addition, each functional unit in various embodiments of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0129] The above-mentioned integrated unit implemented in the form of a software functional unit may be stored in a computer-readable storage medium. The above-mentioned software functional unit stored in a storage medium includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute some steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

[0130] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional module is used as an example for illustration. In actual applications, the above-mentioned functions may be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the device described above may refer to the corresponding process in the foregoing method embodiments and will not be elaborated herein.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present application.

Claims

1. A method for managing an energy storage system, characterized in that, Including: Obtain the cell state data of each energy storage unit in the current energy storage system; wherein, the cell state data characterizes the performance states of the cells in the energy storage unit; Determine the maximum output power of each energy storage unit according to the cell state data of each energy storage unit; For each energy storage unit, determine the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit; Determine the target output power of each energy storage unit according to the actual output power of each energy storage unit and the current load power demand, so that each energy storage unit outputs electric energy according to the target output power; The method further includes: Obtain the self-state information of the AC-DC converter connected to all the DC converters; Determine the power loss of the AC-DC converter according to the self-state information of the AC-DC converter; Determine the current load power demand according to the original load power demand and the power loss of the AC-DC converter itself.

2. The method according to claim 1, wherein The determining the maximum output power of each energy storage unit according to the cell state data of each energy storage unit includes: For each energy storage unit, fit an electric energy curve for the energy storage unit according to the cell state data of the energy storage unit; Determine the maximum output power of the energy storage unit according to the output power peak characterized by the electric energy curve of the energy storage unit.

3. The method according to claim 2, wherein The fitting an electric energy curve for the energy storage unit according to the cell state data of the energy storage unit includes: Determine the remaining power of the energy storage unit according to the cell state information of the energy storage unit; Fit an electric energy curve for the energy storage unit according to the correlation between the remaining power of the energy storage unit and the cell state information.

4. The method according to claim 1, characterized in that The determining the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit includes: Determine the maximum output power that the DC converter can carry according to the maximum output voltage of the DC converter coupled to the energy storage unit; When the maximum output power of the energy storage unit is not greater than the maximum output power that the DC converter can carry, determine the maximum output power of the energy storage unit as the actual output power of the energy storage unit.

5. The method according to claim 4, characterized in that, It further includes: When the maximum output power of the energy storage unit is greater than the maximum output power that the DC converter can carry, determine the maximum output power that the DC converter can carry as the actual output power of the energy storage unit.

6. The method according to claim 1, characterized in that, The cell state information at least includes the single-cell voltage and temperature of each cell.

7. An energy storage system management device, characterized in that, Including: An acquisition module, configured to acquire the cell state data of each energy storage unit in the current energy storage system; wherein, the cell state data characterizes the performance states of the cells in the energy storage unit; A first determination module, configured to determine the maximum output power of each energy storage unit according to the cell state data of each energy storage unit; A second determination module, configured to determine, for each of the energy storage units, the actual output power of the energy storage unit according to the maximum output power of the energy storage unit and the maximum output voltage of the DC converter coupled to the energy storage unit; A management module, configured to determine the target output power of each of the energy storage units according to the actual output power of each of the energy storage units and the current load power demand, so that each of the energy storage units outputs electric energy according to the target output power; The device further includes: A third determination module, configured to obtain the self-state information of the AC-DC converter connected to all the DC converters; determine the power loss of the AC-DC converter according to the self-state information of the AC-DC converter; and determine the current load power demand according to the original load power demand and the power loss of the AC-DC converter itself.

8. A energy storage system, characterized in that, Including: A plurality of energy storage units, a high-voltage box, a DC converter coupled to a single energy storage unit, an AC-DC converter connected to all the DC converters, at least one processor, and a memory; wherein, the energy storage unit includes a plurality of battery cells, and each battery cell is provided with a battery cell data acquisition device; The high-voltage box is configured to provide a hardware interface for the plurality of energy storage units to be connected in series to the DC converter; The DC converter is configured to stably output the dynamic DC voltage of the energy storage unit; The AC-DC converter is configured to convert DC electric energy into AC electric energy; The battery cell data acquisition device is configured to acquire the battery cell state information and send the acquired information to the at least one processor; The memory stores computer execution instructions; The at least one processor executes the computer execution instructions stored in the memory, so that the at least one processor executes the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, Computer execution instructions are stored in the computer-readable storage medium, and when the processor executes the computer execution instructions, the method according to any one of claims 1 to 6 is implemented.

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