Energy storage system grouping identification method and device

Abstract

The application provides a method and device for identifying a group of energy storage systems, wherein the method comprises: selecting a target battery pack in an energy storage system, closing a switch parallel to the target battery pack, collecting circuit parameters of a to-be-determined battery pack in the energy storage system, the to-be-determined battery pack being a battery pack in the energy storage system having a group relationship with the target battery pack; for each to-be-determined battery pack, determining the group relationship between the to-be-determined battery pack and the target battery pack according to the change of the circuit parameters of the to-be-determined battery pack and a mapping relationship between a change value and series-parallel connection. The degree of software and hardware coupling can be reduced, the software adaptation range can be improved, and the cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of battery management technology, and more specifically, to a method and apparatus for identifying energy storage system groups. Background Technology

[0002] For energy storage systems with different voltage levels and product series, the battery packs and their individual battery configurations often differ due to varying usage requirements. Furthermore, with product iterations, the configuration may even change, impacting the output current, charge / discharge current, and battery life of the energy storage system and battery pack. Therefore, a Battery Management System (BMS) is necessary to manage the energy storage system. Currently, by customizing a BMS for each configuration, the same configuration can share a common BMS. However, this method inevitably results in numerous versions of the BMS for the same energy storage system as the configuration changes, leading to low hardware-software coupling between the BMS and the energy storage system. This increases development difficulty and costs, especially enhancing the complexity of later maintenance and incurring unnecessary maintenance costs. Therefore, it is necessary to develop an energy storage system configuration identification method that allows the BMS to proactively identify the energy storage system's configuration, thereby reducing hardware-software coupling and lowering software development and maintenance costs. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method and apparatus for identifying energy storage system groups, so as to reduce the degree of hardware and software coupling, improve the software adaptability range, and reduce costs.

[0004] In a first aspect, embodiments of the present invention provide a method for identifying energy storage system groups, including:

[0005] Select a target battery pack in the energy storage system, close a switch connected in parallel with the target battery pack, and collect the circuit parameters of the battery pack to be determined in the energy storage system. The battery pack to be determined is a battery pack in the energy storage system that has a group relationship with the target battery pack.

[0006] For each battery pack to be determined, the grouping relationship between the battery pack to be determined and the target battery pack is determined based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and series and parallel connections.

[0007] In conjunction with the first aspect, embodiments of the present invention provide a first possible implementation of the first aspect, wherein, before selecting a target battery pack in the energy storage system and closing a switch connected in parallel with the target battery pack, the method further includes:

[0008] After the energy storage system starts up normally, the circuit parameters output by each battery pack in the energy storage system are collected.

[0009] In conjunction with the first possible implementation of the first aspect, this embodiment of the invention provides a second possible implementation of the first aspect, wherein the circuit parameters include voltage and current.

[0010] In conjunction with the first aspect, this invention provides a third possible implementation of the first aspect, wherein determining the grouping relationship between the battery pack to be determined and the target battery pack based on changes in the circuit parameters of the battery pack to be determined and a pre-set mapping relationship between the changes and series / parallel connections includes:

[0011] From the voltages of each battery pack to be determined, it is determined that there are cases where the voltage of the battery pack to be determined is greater than the output voltage of the corresponding battery pack to be determined.

[0012] Identify battery packs whose collected voltage is greater than the output voltage of the corresponding battery pack to be identified;

[0013] If the currents of the battery packs to be determined are all equal and equal to the currents of the target battery pack, it is determined that the battery packs to be determined and the target battery pack are connected in series, and the energy storage system is grouped in series first and then in parallel.

[0014] In conjunction with the first aspect, this invention provides a fourth possible implementation of the first aspect, wherein determining the grouping relationship between the battery pack to be determined and the target battery pack based on changes in the circuit parameters of the battery pack to be determined and a pre-set mapping relationship between the changes and series-parallel connections includes:

[0015] From the voltages of each battery pack to be determined, it was determined that there was no case where the voltage of the battery pack to be determined was greater than the output voltage of the corresponding battery pack to be determined;

[0016] Identify battery packs whose collected voltage is less than the corresponding output voltage of the battery pack to be identified;

[0017] For each acquired battery pack to be determined, if the current of the battery pack to be determined is equal to the current of the target battery pack, it is determined that the battery pack to be determined and the target battery pack are connected in parallel. The energy storage system is grouped in parallel first and then in series.

[0018] In conjunction with the third or fourth possible implementation of the first aspect, this embodiment of the invention provides a fifth possible implementation of the first aspect, which further includes:

[0019] Check whether all battery packs in the energy storage system have been traversed;

[0020] If the battery packs have not been completely traversed, select one battery pack as the target battery pack from the remaining untraversed battery packs and execute the step of closing the switch connected in parallel with the target battery pack until all battery packs have been traversed.

[0021] In conjunction with the first aspect, and any of the first to fourth possible implementations of the first aspect, this embodiment of the invention provides a sixth possible implementation of the first aspect, which further includes: for each battery pack, selecting a target battery in the battery pack, closing a switch connected in parallel with the target battery, and collecting circuit parameters of the battery to be determined in the battery pack, wherein the battery to be determined is a battery in the battery pack other than the target battery;

[0022] For each battery to be determined, the grouping relationship between the battery to be determined and the target battery is determined based on the changes in the circuit parameters of the battery to be determined and the mapping relationship.

[0023] Secondly, embodiments of the present invention also provide an energy storage system group identification device, comprising:

[0024] The circuit parameter acquisition module is used to select the target battery pack in the energy storage system, close the switch connected in parallel with the target battery pack, and acquire the circuit parameters of the battery pack to be determined in the energy storage system. The battery pack to be determined is the battery pack in the energy storage system that has a group relationship with the target battery pack.

[0025] The grouping relationship identification module is used to determine the grouping relationship between each battery pack to be determined and the target battery pack based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and series and parallel connections.

[0026] Thirdly, embodiments of this application provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described method.

[0027] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the above-described method.

[0028] The energy storage system group identification method and apparatus provided in this invention selects a target battery pack in the energy storage system, closes a switch connected in parallel with the target battery pack, and collects the circuit parameters of the battery packs to be identified in the energy storage system. The battery packs to be identified are those in the energy storage system that have a group relationship with the target battery pack. For each battery pack to be identified, the group relationship between the battery pack to be identified and the target battery pack is determined based on the changes in the circuit parameters of the battery pack to be identified and the pre-set mapping relationship between the changes and series and parallel connections. In this way, based on the characteristics of series circuits and parallel circuits, after closing the switch of one battery pack, by acquiring the changes in the circuit parameters of other battery packs, and based on the changes in the circuit parameters and the characteristics of series and parallel circuits, the group relationship between the other batteries and the batteries after the switch is closed is determined. Therefore, after the grouping method changes, the changed grouping method can be quickly and accurately identified, which can effectively reduce the coupling between the software and energy storage hardware used for grouping method identification, and reduce the complexity and cost of software development and maintenance.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic flowchart of the energy storage system group identification method provided in an embodiment of the present invention is shown;

[0032] Figure 2 This diagram illustrates the structure of the energy storage system provided in an embodiment of the present invention, which is connected in series and then in parallel to form a group.

[0033] Figure 3 This diagram illustrates the structure of the energy storage system provided in this embodiment of the invention, which is a grouped system consisting of parallel connections followed by series connections.

[0034] Figure 4 This diagram illustrates the specific process of the energy storage system group identification method provided in an embodiment of the present invention.

[0035] Figure 5 A schematic diagram of the energy storage system group identification device provided in an embodiment of the present invention is shown;

[0036] Figure 6This is a schematic diagram of the structure of a computer device 600 provided in an embodiment of this application. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] This invention provides a method and apparatus for identifying energy storage system groups, which will be described below through embodiments.

[0039] Figure 1 A schematic flowchart of the energy storage system group identification method provided in an embodiment of the present invention is shown. Figure 1 As shown, the method includes:

[0040] Step 101: Select the target battery pack in the energy storage system, close the switch connected in parallel with the target battery pack, and collect the circuit parameters of the battery pack to be determined in the energy storage system. The battery pack to be determined is the battery pack in the energy storage system that has a group relationship with the target battery pack.

[0041] In this embodiment of the invention, as an optional embodiment, the target battery pack is any battery pack in the energy storage system.

[0042] In this embodiment of the invention, the energy storage system includes a battery management unit (BMU) and multiple battery packs. The series-parallel connection method of the multiple battery packs is unknown. The battery packs include multiple batteries connected in series, in parallel, or in series-parallel connection.

[0043] In this embodiment of the invention, each battery pack is connected in parallel with a resistor and a switch. The resistor and the switch are connected in series and then in parallel with the battery pack to form a passive balancing circuit, a battery pack heating circuit, etc. Each battery in the battery pack is connected in parallel with a resistor and a switch. The resistor and the switch are connected in series and then in parallel with the battery. A voltage sensor and a current sensor are provided at both ends of the battery pack and the battery.

[0044] In another optional embodiment of the present invention, before selecting a target battery pack in the energy storage system and closing a switch connected in parallel with the target battery pack, the method further includes:

[0045] After the energy storage system starts up normally, the output voltage and output current of each battery pack in the energy storage system are collected.

[0046] In this embodiment of the invention, by collecting the voltage and current of each battery pack in the energy storage system, it is convenient to determine whether the voltage and current of each battery pack increase after the switch is closed, based on the circuit parameters including voltage and current.

[0047] Step 102: For each battery pack to be determined, the grouping relationship between the battery pack to be determined and the target battery pack is determined based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and the series and parallel connections.

[0048] In this embodiment of the invention, there are only two ways to assemble the battery pack or the batteries: first in series and then in parallel, and first in parallel and then in series.

[0049] Figure 2 A schematic diagram of the structure of the energy storage system provided in an embodiment of the present invention, which is first connected in series and then in parallel to form a group, is shown. Figure 2 As shown, taking the switch S11 (which is connected in series with resistor R11) of a closed battery pack BU11 (including batteries C1, C2, ..., Cx, x≥1) as an example, the principle of identifying the grouping method of first series then parallel (series then parallel) is explained:

[0050] According to Kirchhoff's voltage law and current law, the current i passing through switch S11 is:

[0051] i = i1 + i2 + ... + i m =m·i1

[0052] The current of other battery packs connected in series with battery pack BU11 is i 10 :

[0053] i 10 =-(i2+…+i m )=(1-m)·i1.

[0054] Where i1 is the current of battery pack BU11, i mLet be the current of the m-th battery pack series group (including battery packs BUm1, BUm2, ..., BUmn, where m ≥ 1). Therefore, after switch S11 is closed, battery pack BU11 and the batteries or battery packs connected in parallel with it are all in a discharging state, and the discharging currents are equal. When a battery or battery pack is in a discharging state, its terminal voltage decreases (compared to the open circuit state). On the other hand, after switch S11 is closed, the batteries or battery packs connected in series with BU11 are in a charging state, and their terminal voltage increases (compared to the open circuit state). Therefore, in this embodiment of the invention, the identification of the battery pack series-to-parallel grouping method can be achieved based on the current and voltage of the battery or battery pack.

[0055] Figure 3 A schematic diagram of the energy storage system provided in an embodiment of the present invention, showing a configuration of parallel and then series connections, is shown. Figure 3 As shown, battery pack BU11 (including batteries C1, C2, ..., Cx, x≥1 connected in series), battery pack BU21, ..., battery pack Bun1 are connected in parallel to form the first parallel battery pack group; battery pack BU12, battery pack BU22, ..., battery pack Bun2 are connected in parallel to form the second parallel battery pack group; and battery pack BU1n, battery pack BU2n, ..., battery pack Bunn are connected in parallel to form the nth parallel battery pack group. The parallel battery pack groups are connected in series. Taking the closed switch S11 of battery pack BU11 as an example, the principle of identifying the grouping method of parallel-then-series connection is explained:

[0056] According to Kirchhoff's voltage law and current law, after switch S11 is closed, the current i flowing through switch S11 is:

[0057] i = i1 + i2 + ... + i m =m·i1

[0058] The current of other batteries or battery packs is 0.

[0059] In this embodiment of the invention, after switch S11 is closed, battery pack BU11 and the batteries or battery packs connected in parallel with it are all in a discharging state, and the discharging currents are equal. The terminal voltage of the battery pack decreases when it is in a discharging state (compared to the open-circuit state). Therefore, the grouping method of the battery packs (parallel-to-series connection) can be identified based on the mapping relationship between current and voltage. Thus, as an optional embodiment, the circuit parameters include voltage and current. Based on the changes in the circuit parameters of the battery pack to be determined, and the pre-set mapping relationship between the changes and the series-parallel connection, the grouping relationship between the battery pack to be determined and the target battery pack is determined, including:

[0060] From the voltages of each battery pack to be determined, it is determined that there are cases where the voltage of the battery pack to be determined is greater than the output voltage of the corresponding battery pack to be determined.

[0061] Identify battery packs whose collected voltage is greater than the output voltage of the corresponding battery pack to be identified;

[0062] If the currents of the battery packs to be determined are all equal and equal to the currents of the target battery pack, it is determined that the battery packs to be determined and the target battery pack are connected in series, and the energy storage system is grouped in series first and then in parallel.

[0063] In this embodiment of the invention, as another optional embodiment, the grouping relationship between the battery pack to be determined and the target battery pack is determined based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and series and parallel connections, including:

[0064] From the voltages of each battery pack to be determined, it was determined that there was no case where the voltage of the battery pack to be determined was greater than the output voltage of the corresponding battery pack to be determined;

[0065] Identify battery packs whose collected voltage is less than the corresponding output voltage of the battery pack to be identified;

[0066] For each acquired battery pack to be determined, if the current of the battery pack to be determined is equal to the current of the target battery pack, it is determined that the battery pack to be determined and the target battery pack are connected in parallel. The energy storage system is grouped in parallel first and then in series.

[0067] In another optional embodiment of this invention, the method further includes:

[0068] Check whether all battery packs in the energy storage system have been traversed;

[0069] If the battery packs have not been completely traversed, select one battery pack as the target battery pack from the remaining untraversed battery packs and execute the step of closing the switch connected in parallel with the target battery pack until all battery packs have been traversed.

[0070] In this embodiment of the invention, another battery pack is selected from the remaining battery packs, and the above steps are repeated until all battery packs are grouped.

[0071] In this embodiment of the invention, an error is reported if the mapping relationship between the changed value and the series-parallel connection is not satisfied.

[0072] In another optional embodiment of this invention, the method further includes:

[0073] Record the battery pack grouping method and the series and parallel connection relationship between the battery packs in the energy storage system.

[0074] In this embodiment of the invention, taking an energy storage system containing (n+1) battery packs as an example, the energy storage system is in an open-circuit state, and all battery packs in the energy storage system are numbered, such as BU1, BU2, ..., Bun+1. If the voltage of n battery packs increases (the voltage of the battery pack to be determined is greater than the output voltage of the corresponding battery pack to be determined), and the current of all the battery packs with increased voltage is equal, and the total current is n times the current of battery pack BU1, then these n battery packs are connected in series with battery pack BU1, forming a series group. The battery packs in this group are renumbered as BU11, BU12…BU1n, and it can be determined that the energy storage system is grouped in series first, then in parallel. Otherwise, check the battery packs with decreased voltage. If the voltage of m battery packs decreases, and the current of these m battery packs is equal to the current of battery pack BU1, then these m battery packs are connected in parallel with battery pack BU1, forming a parallel group. The battery packs in this group are renumbered as BU11, BU21…BUm1, and it can be determined that the energy storage system is grouped in parallel first, then in series. Select another battery pack from the remaining battery packs and repeat the above steps until all battery packs are grouped.

[0075] In an optional embodiment of this invention, the method further includes:

[0076] For each battery pack, select the target battery in the battery pack, close the switch connected in parallel with the target battery, and collect the circuit parameters of the battery to be determined in the battery pack. The battery to be determined is the battery in the battery pack other than the target battery.

[0077] For each battery to be determined, the grouping relationship between the battery to be determined and the target battery is determined based on the changes in the circuit parameters of the battery to be determined and the mapping relationship.

[0078] In this embodiment of the invention, determining the grouping relationship between the battery to be determined and the target battery is similar to determining the grouping relationship between the battery pack to be determined and the target battery pack. For example, from the voltages of each battery to be determined, it is determined that there is a case where the voltage of the battery to be determined is greater than the output voltage of the corresponding battery to be determined; the batteries to be determined whose voltages are greater than the output voltage of the corresponding batteries to be determined are acquired; if the currents of the acquired batteries to be determined are all equal and equal to the currents of the target battery, it is determined that the acquired batteries to be determined and the target battery are in series.

[0079] In this embodiment of the invention, without incurring additional costs, based on the characteristics of series and parallel circuits, after closing the switch of one battery pack, the changes in the circuit parameters of other battery packs are obtained. Based on these changes in circuit parameters and the characteristics of series and parallel circuits (the mapping relationship between series and parallel connections), the grouping relationship between the other batteries and the batteries after the switch is closed is determined. This enables the BMS to identify the grouping mode (relationship) of the energy storage system. Even if the grouping mode changes, the changed grouping mode can be accurately identified. This effectively reduces the coupling between the BMS and the energy storage hardware, improves the generalization performance of the BMS, and reduces the complexity and cost of BMS development and maintenance.

[0080] Figure 4 A schematic diagram illustrating the specific process of the energy storage system group identification method provided in an embodiment of the present invention is shown. Figure 4 As shown, the method includes:

[0081] Step 401: Number the battery pack;

[0082] In this embodiment of the invention, the battery packs are numbered as: BU1, BU2, ..., Bun.

[0083] Step 402: Select a battery pack and close the switch connected in parallel with the battery pack;

[0084] In this embodiment of the invention, a battery pack BUx (x = 1, 2, ..., n) is selected, and the switch Sx connected in parallel with the battery pack BUx is closed.

[0085] Step 403: Detect and acquire circuit parameters of other battery packs;

[0086] In this embodiment of the invention, the circuit parameters include: current and voltage.

[0087] Step 404: Determine if there is a voltage rise in the battery pack. If yes, proceed to step 405; otherwise, proceed to step 406.

[0088] In this embodiment of the invention, processing is performed based on whether there is a voltage increase.

[0089] Step 405: Based on the voltage and current relationship, identify the battery packs connected in series with the selected battery pack, mark the series group, and proceed to step 407.

[0090] In this embodiment of the invention, the voltage and current relationship (mapping relationship) is as follows: the detected current of the battery pack is equal to the current of the selected battery pack, the battery pack and the selected battery pack are connected in series, and the energy storage system is connected in series first and then in parallel.

[0091] Step 406: Based on the voltage and current relationship, find the battery packs connected in parallel with the selected battery pack, mark the parallel group, and proceed to step 407.

[0092] Step 407: Check if there are any ungrouped battery packs. If so, proceed to step 402; otherwise, proceed to step 408.

[0093] Step 408: Renumber each group of battery packs and record the grouping method and classification results of all battery packs.

[0094] Figure 5 A schematic diagram of the energy storage system group identification device provided in an embodiment of the present invention is shown. Figure 5 As shown, the device includes:

[0095] The circuit parameter acquisition module 501 is used to select a target battery pack in the energy storage system, close a switch connected in parallel with the target battery pack, and acquire the circuit parameters of the battery pack to be determined in the energy storage system. The battery pack to be determined is a battery pack in the energy storage system that has a group relationship with the target battery pack.

[0096] In this embodiment of the invention, as an optional embodiment, the circuit parameters include voltage and current.

[0097] In this embodiment of the invention, as an optional embodiment, the circuit parameter acquisition module 501 is further used for:

[0098] After the energy storage system starts up normally, the circuit parameters output by each battery pack in the energy storage system are collected.

[0099] The grouping relationship identification module 502 is used to determine the grouping relationship between each battery pack to be determined and the target battery pack based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and series and parallel connections.

[0100] In this embodiment of the invention, as an optional embodiment, the group relationship identification module 502 is specifically used for:

[0101] From the voltages of each battery pack to be determined, it is determined that there are cases where the voltage of the battery pack to be determined is greater than the output voltage of the corresponding battery pack to be determined.

[0102] Identify battery packs whose collected voltage is greater than the output voltage of the corresponding battery pack to be identified;

[0103] If the currents of the battery packs to be determined are all equal and equal to the currents of the target battery pack, it is determined that the battery packs to be determined and the target battery pack are connected in series, and the energy storage system is grouped in series first and then in parallel.

[0104] In this embodiment of the invention, as another optional embodiment, the group relationship identification module 502 is further used for:

[0105] From the voltages of each battery pack to be determined, it was determined that there was no case where the voltage of the battery pack to be determined was greater than the output voltage of the corresponding battery pack to be determined;

[0106] Identify battery packs whose collected voltage is less than the corresponding output voltage of the battery pack to be identified;

[0107] For each acquired battery pack to be determined, if the current of the battery pack to be determined is equal to the current of the target battery pack, it is determined that the battery pack to be determined and the target battery pack are connected in parallel. The energy storage system is grouped in parallel first and then in series.

[0108] In another optional embodiment of this invention, the group relationship identification module 502 is further configured to:

[0109] Check whether all battery packs in the energy storage system have been traversed;

[0110] If the battery packs have not been completely traversed, select one battery pack as the target battery pack from the remaining untraversed battery packs and execute the step of closing the switch connected in parallel with the target battery pack until all battery packs have been traversed.

[0111] In another optional embodiment of this invention, the group relationship identification module 502 is further configured to:

[0112] For each battery pack, select the target battery in the battery pack, close the switch connected in parallel with the target battery, and collect the circuit parameters of the battery to be determined in the battery pack. The battery to be determined is the battery in the battery pack other than the target battery.

[0113] For each battery to be determined, the grouping relationship between the battery to be determined and the target battery is determined based on the changes in the circuit parameters of the battery to be determined and the mapping relationship.

[0114] like Figure 6 As shown, one embodiment of this application provides a computer device 600 for performing... Figure 1 The energy storage system group identification method includes a memory 601, a processor 602 connected to the memory 601 via a bus, and a computer program stored on the memory 601 and executable on the processor 602. The processor 602 executes the computer program to implement the steps of the energy storage system group identification method.

[0115] Specifically, the memory 601 and processor 602 can be general-purpose memory and processor, without any specific limitations. When the processor 602 runs the computer program stored in the memory 601, it can execute the above-mentioned energy storage system group identification method.

[0116] Corresponding to Figure 1 In addition to the energy storage system group identification method described above, this application also provides a computer-readable storage medium storing a computer program, which is executed by a processor to perform the steps of the energy storage system group identification method.

[0117] Specifically, the storage medium can be a general-purpose storage medium, such as a portable disk or hard disk. When the computer program on the storage medium is run, it can execute the above-mentioned energy storage system group identification method.

[0118] In the embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. The system embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interface; the indirect coupling or communication connection between systems or units may be electrical, mechanical, or other forms.

[0119] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0120] In addition, the functional units in the embodiments provided in this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0121] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0122] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0123] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. All should be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A method for identifying groups of energy storage systems, characterized in that, include: Select a target battery pack in the energy storage system, close a switch connected in parallel with the target battery pack, and collect the circuit parameters of the battery pack to be determined in the energy storage system. The battery pack to be determined is a battery pack in the energy storage system that has a group relationship with the target battery pack. For each battery pack to be determined, the grouping relationship between the battery pack to be determined and the target battery pack is determined based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and series and parallel connections. The step of determining the grouping relationship between the battery pack to be determined and the target battery pack based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and series and parallel connections includes: From the voltages of each battery pack to be determined, it is determined that there are cases where the voltage of the battery pack to be determined is greater than the output voltage of the corresponding battery pack to be determined. Identify battery packs whose collected voltage is greater than the output voltage of the corresponding battery pack to be identified; If the currents of the battery packs to be determined are all equal and equal to the currents of the target battery pack, it is determined that the battery packs to be determined and the target battery pack are connected in series, and the energy storage system is grouped in series first and then in parallel.

2. The method according to claim 1, characterized in that, Before selecting a target battery pack in the energy storage system and closing a switch connected in parallel with the target battery pack, the method further includes: After the energy storage system starts up normally, the circuit parameters output by each battery pack in the energy storage system are collected.

3. The method according to claim 1, characterized in that, The step of determining the grouping relationship between the battery pack to be determined and the target battery pack based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and series and parallel connections includes: From the voltages of each battery pack to be determined, it was determined that there was no case where the voltage of the battery pack to be determined was greater than the output voltage of the corresponding battery pack to be determined; Identify battery packs whose collected voltage is less than the corresponding output voltage of the battery pack to be identified; For each acquired battery pack to be determined, if the current of the battery pack to be determined is equal to the current of the target battery pack, it is determined that the battery pack to be determined and the target battery pack are connected in parallel. The energy storage system is grouped in parallel first and then in series.

4. The method according to claim 1 or 3, characterized in that, Also includes: Check whether all battery packs in the energy storage system have been traversed; If the battery packs have not been completely traversed, select one battery pack as the target battery pack from the remaining untraversed battery packs and execute the step of closing the switch connected in parallel with the target battery pack until all battery packs have been traversed.

5. The method according to any one of claims 1 to 3, characterized in that, Also includes: For each battery pack, select the target battery in the battery pack, close the switch connected in parallel with the target battery, and collect the circuit parameters of the battery to be determined in the battery pack. The battery to be determined is the battery in the battery pack other than the target battery. For each battery to be determined, the grouping relationship between the battery to be determined and the target battery is determined based on the changes in the circuit parameters of the battery to be determined and the mapping relationship.

6. A group identification device for an energy storage system, characterized in that, include: The circuit parameter acquisition module is used to select the target battery pack in the energy storage system, close the switch connected in parallel with the target battery pack, and acquire the circuit parameters of the battery pack to be determined in the energy storage system. The battery pack to be determined is the battery pack in the energy storage system that has a group relationship with the target battery pack. The grouping relationship identification module is used to determine the grouping relationship between each battery pack to be determined and the target battery pack based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and series and parallel connections. The grouping relationship identification module is used to determine the grouping relationship between the battery pack to be determined and the target battery pack based on the changes in the circuit parameters of the battery pack to be determined and the pre-set mapping relationship between the changes and series and parallel connections. Specifically, it is used for: From the voltages of each battery pack to be determined, it is determined that there are cases where the voltage of the battery pack to be determined is greater than the output voltage of the corresponding battery pack to be determined. Identify battery packs whose collected voltage is greater than the output voltage of the corresponding battery pack to be identified; If the currents of the battery packs to be determined are all equal and equal to the currents of the target battery pack, it is determined that the battery packs to be determined and the target battery pack are connected in series, and the energy storage system is grouped in series first and then in parallel.

7. A computer device, characterized in that, include: The system includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the computer device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, they perform the steps of the energy storage system group identification method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the energy storage system group identification method as described in any one of claims 1 to 5.

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