Energy storage system and insulation resistance acquisition method thereof, electronic device and storage medium

Abstract

Embodiments of the present application disclose a kind of energy storage system and its insulation resistance acquisition method, electronic equipment and storage medium.The energy storage system includes at least one cluster battery cluster, battery cluster includes at least one battery pack and battery cluster management unit;The method comprises: obtaining the first quantity of battery cluster, the second quantity of battery pack and the third quantity of battery cluster management unit;According to the first quantity, the second quantity and the third quantity, determine the distribution information of battery cluster, battery pack and battery cluster management unit in energy storage system;According to distribution information, the first insulation resistance value of battery pack and the second insulation resistance value of battery cluster management unit, obtain the target insulation resistance value of energy storage system, thereby solve the difference between the actual value and the theoretical value of the insulation resistance of energy storage system, the technical problem of lower accuracy, and then can provide the basis for providing the standard value of the insulation resistance of energy storage system subsequently.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an energy storage system, a method for obtaining the insulation resistance of the same, an electronic device, and a storage medium. Background Technology

[0002] With the continuous development of the electrochemical energy storage industry, the requirements for the safety of energy storage systems are becoming increasingly stringent. Among these requirements, the insulation resistance of an energy storage system is a crucial indicator for evaluating its electrical safety performance. The insulation resistance of energy storage systems is typically determined with reference to the national standard GB / T 36276-2018 "Lithium-ion Batteries for Power Storage" or enterprise standards.

[0003] The national standard stipulates that the ratio of the insulation resistance between the positive terminal of a battery module and its exposed conductive parts, and between the negative terminal of a battery module and its exposed conductive parts, to the nominal voltage in an energy storage system shall not be less than 1000Ω. Similarly, the ratio of the insulation resistance between the positive terminal of a battery cluster and its exposed conductive parts, and between the negative terminal of a battery cluster and its exposed conductive parts, to the nominal voltage in an energy storage system shall not be less than 1000Ω. Therefore, the insulation resistance value of a DC 1500V energy storage system must be no less than 1.5MΩ. Enterprise standards generally use actual test values ​​combined with the national standard to select an intermediate value; for example, they may stipulate that the insulation resistance value of a battery module must be no less than 550MΩ or no less than 20MΩ. However, while the insulation resistance values ​​for energy storage systems established in this way can ensure the safety of the system, the method of setting these values ​​is unreasonable, leading to a significant difference between the actual and theoretical insulation resistance values, resulting in low accuracy. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides an energy storage system, a method for obtaining its insulation resistance, an electronic device, and a storage medium, aiming to solve the technical problem of large discrepancies between the actual and theoretical values ​​of the insulation resistance of energy storage systems and low accuracy in existing technologies.

[0005] To address the aforementioned problems, in a first aspect, embodiments of this application provide a method for obtaining the insulation resistance of an energy storage system. The energy storage system includes at least one battery cluster, and each battery cluster includes at least one battery pack and a battery cluster management unit. The method includes:

[0006] Obtain the first number of battery clusters, the second number of battery packs, and the third number of battery cluster management units;

[0007] The distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system is determined based on the first quantity, the second quantity, and the third quantity.

[0008] The target insulation resistance value of the energy storage system is obtained based on the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit.

[0009] Secondly, embodiments of this application also provide an insulation resistance acquisition device for an energy storage system, the energy storage system including at least one battery cluster, the battery cluster including at least one battery pack and a battery cluster management unit; the method includes:

[0010] The first acquisition unit is used to acquire the first number of battery clusters, the second number of battery packs, and the third number of battery cluster management units;

[0011] The determining unit is used to determine the distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system based on the first quantity, the second quantity, and the third quantity.

[0012] The second acquisition unit is used to acquire the target insulation resistance value of the energy storage system based on the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit.

[0013] Thirdly, embodiments of this application also provide an energy storage system, which uses the insulation resistance acquisition method provided in the first aspect to obtain the insulation resistance value;

[0014] The energy storage system includes multiple battery clusters and combiner cabinets. The battery clusters are connected in series and parallel, and the combiner cabinets are connected by a busbar.

[0015] Each battery cluster includes a high-voltage box and multiple battery packs; the battery packs are connected in series and parallel, and then connected in series with the high-voltage box to form the main circuit of the battery cluster.

[0016] The high-voltage box contains a battery cluster management unit, and the battery pack, high-voltage box, and combiner cabinet are all grounded.

[0017] Fourthly, embodiments of this application also provide an electronic device, including a memory storing multiple instructions; a processor loads instructions from the memory to execute the insulation resistance acquisition method of the energy storage system of the first aspect.

[0018] Fifthly, embodiments of this application also provide a computer-readable storage medium storing multiple instructions adapted for loading by a processor to execute the insulation resistance acquisition method of the energy storage system of the first aspect.

[0019] In a sixth aspect, embodiments of this application also provide a computer program product, including a computer program or instructions, wherein the computer program or instructions are executed by a processor as a method for obtaining the insulation resistance of an energy storage system in the first aspect.

[0020] In the method for obtaining the insulation resistance of an energy storage system provided in this application, a first number of battery clusters, a second number of battery packs, and a third number of battery cluster management units are obtained. Based on the first, second, and third numbers, the distribution information of the battery clusters, battery packs, and battery cluster management units in the energy storage system is determined. Then, based on the distribution information, the first insulation resistance value of the battery packs, and the second insulation resistance value of the battery cluster management units, the target insulation resistance value of the energy storage system can be obtained. This solves the technical problem of a large difference between the actual and theoretical values ​​of the insulation resistance of the energy storage system and low accuracy. Furthermore, it can provide a basis for subsequently providing a standard value for the insulation resistance of the energy storage system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic block diagram of an energy storage system provided in an embodiment of this application;

[0023] Figure 2 A first equivalent circuit diagram provided for embodiments of this application;

[0024] Figure 3 The second equivalent circuit diagram provided for the embodiments of this application;

[0025] Figure 4 The third equivalent circuit diagram provided for the embodiments of this application;

[0026] Figure 5 This is a schematic flowchart of a method for obtaining the insulation resistance of an energy storage system provided in an embodiment of this application.

[0027] Figure 6 A schematic block diagram of an insulation resistance acquisition device for an energy storage system provided in an embodiment of this application;

[0028] Figure 7 This is a schematic block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] Furthermore, in this application, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific implementation.

[0034] Embodiments of this application provide an energy storage system, a method for obtaining the insulation resistance of the same, an electronic device, and a storage medium.

[0035] To facilitate understanding, we will first introduce the energy storage system, and then explain in detail the method for obtaining the insulation resistance of the energy storage system.

[0036] Please see Figure 1 , Figure 1 This is a schematic block diagram of an energy storage system provided in an embodiment of this application. Figure 1As shown, an energy storage system includes multiple battery clusters and a combiner cabinet 10. The battery clusters are connected in parallel and can be electrically connected to the combiner cabinet 10 via a busbar. The combiner cabinet 10 contains a main positive switch K1 and a main negative switch K2. Each battery cluster includes a high-voltage box 20 and multiple battery packs 30. The battery packs 30 are connected in series and then in series with the high-voltage box 20 to form the main circuit of the battery cluster. The high-voltage box 20 can be equivalent to the battery cluster management unit mentioned in this application, or it can be equivalent to a high-voltage box. The high-voltage box 20 contains an equalization circuit, a main positive switch K3, a main negative switch K4, a first fuse FU1, and a second fuse FU2. The equalization circuit includes switches K5 and K6. The battery packs 30 may include multiple cells connected in series and parallel, and a third fuse FU3. Simultaneously, the combiner cabinet 10, the high-voltage box 20, and the battery packs 30 are all grounded to GND.

[0037] based on Figure 1 The energy storage system shown, since each battery cluster is grounded, can be equivalent to the following when the battery clusters are connected in parallel: Figure 2 The equivalent circuit is shown. Furthermore, Figure 2 The equivalent circuit shown can be further equivalent to: Figure 3 The equivalent circuit shown is... Figure 3 The equivalent circuit shown can be further equivalent to... Figure 4 The equivalent circuit is shown. Wherein, Figure 2 , Figure 3 as well as Figure 4 The resistors R1, R2, R3, ..., Rn in the diagram can be understood as the insulation resistance of each battery cluster.

[0038] because Figure 4 The resistance value R of the equivalent circuit shown (which can be understood as the insulation resistance value of the equivalent circuit) can be calculated using the following formula:

[0039]

[0040] If the resistance values ​​of resistors R1, R2, R3, ..., Rn are all R0, the final calculation formula can be: The insulation resistance value of a battery cluster can be obtained by multiplying the insulation resistance value of the energy storage system by the number of battery clusters.

[0041] based on Figure 1 The energy storage system shown, since each battery pack and the high-voltage box are grounded, can also be considered equivalent to the system after the battery packs and the high-voltage box are connected in series. Figure 2 The equivalent circuit is shown. Furthermore, Figure 2 The equivalent circuit shown can be further equivalent to: Figure 3 The equivalent circuit shown is... Figure 3 The equivalent circuit shown can be further equivalent to... Figure 4The equivalent circuit is shown below. At this point, Figure 2 , Figure 3 as well as Figure 4 In this context, resistor R1 can be understood as the insulation resistance of the high-voltage box, and resistors R2, R3, ..., Rn can be understood as the insulation resistance of each battery pack.

[0042] because Figure 4 The resistance value R of the equivalent circuit shown (which can be understood as the insulation resistance value of the equivalent circuit) can be calculated using the following formula:

[0043]

[0044] If the resistance values ​​of resistors R1, R2, R3, ..., Rn are all R0, the final calculation formula can be: The insulation resistance value of the battery pack can be obtained by multiplying the insulation resistance value of the battery cluster by a preset quantity. The preset quantity is equal to the sum of the number of battery packs and the number of high-voltage boxes.

[0045] Therefore, assuming that the insulation resistance values ​​of each battery cluster are consistent, and that the insulation resistance values ​​of each battery pack and the high-voltage box are consistent, the formula for calculating the insulation resistance value of the energy storage system can be:

[0046]

[0047] Where R is the insulation resistance value of the energy storage system, Ra is the insulation resistance value of each battery pack and high-voltage box, n1 is the number of battery clusters, and n2 and n3 are the number of battery packs and high-voltage boxes in each battery cluster, respectively.

[0048] In view of this, this application provides a method, electronic device and storage medium for obtaining the insulation resistance of an energy storage system, which solves the technical problem that the actual value and theoretical value of the insulation resistance of the energy storage system are significantly different and the accuracy is low, and can provide a basis for providing standard values ​​of the insulation resistance of the energy storage system in the future.

[0049] Please see Figure 5 , Figure 5 This is a flowchart illustrating the method for obtaining the insulation resistance of an energy storage system provided in this application embodiment. The method for obtaining the insulation resistance of an energy storage system provided in this application embodiment is applied in a terminal device, and the method is executed through application software installed in the terminal device. The terminal device can be a desktop computer, laptop computer, tablet computer, mobile phone, etc.

[0050] It should be noted that the application scenarios described in the following embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0051] The following section provides a detailed explanation of the method for obtaining the insulation resistance of an energy storage system.

[0052] like Figure 5 As shown, the method includes the following steps S110 to S130.

[0053] S110, Obtain the first number of battery clusters, the second number of battery packs, and the third number of battery cluster management units.

[0054] In this embodiment, the first quantity can be understood as the number of battery clusters connected in parallel in the energy storage system, the second quantity can be understood as the number of battery packs in the energy storage system, and the third quantity can be understood as the number of battery cluster management units in the energy storage system. In this embodiment, the battery clusters, battery packs, and battery cluster management units all reside within the same energy storage system.

[0055] Specifically, after obtaining the first number of battery clusters, the second number of battery packs, and the third number of battery cluster management units in the energy storage system, this application can determine the distribution information of the battery clusters, battery packs, and battery cluster management units in the energy storage system. Then, the insulation resistance value of the energy storage system can be obtained based on the distribution information, the first insulation resistance value of the battery packs, and the second insulation resistance value of the battery cluster management units.

[0056] S120. Determine the distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system based on the first quantity, the second quantity, and the third quantity.

[0057] In this embodiment, the distribution information can be understood as the parallel connection information of each battery cluster in the energy storage system and the connection information of the battery packs and battery cluster management units in each battery cluster. That is, the distribution information includes a first quantity and the sum of the number of battery packs and battery cluster management units in each battery cluster. After obtaining the first quantity of battery clusters, the second quantity of battery packs, and the third quantity of battery cluster management units in the energy storage system, the first quantity, the number of battery packs in each battery cluster, and the number of battery cluster management units can be determined. Thus, the insulation resistance value of the energy storage system can be obtained based on the distribution information, the first insulation resistance value of the battery packs, and the second insulation resistance value of the battery cluster management units.

[0058] In some embodiments, determining the distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system based on a first quantity, a second quantity, and a third quantity includes: if the first quantity is not greater than a preset first threshold, determining the distribution information based on the second quantity and the third quantity; if the first quantity is greater than the first threshold, obtaining battery cluster information for each battery cluster; and determining the distribution information based on the battery cluster information.

[0059] In this embodiment, battery cluster information can be understood as the parameter information of each battery cluster in the energy storage system, such as the voltage, current, number of battery packs, and presence of a battery management unit after full charging. Using the battery cluster information of each cluster, the number of battery packs and the number of battery cluster management units in each cluster can be determined, and then used sequentially as distribution information to calculate the insulation resistance value of each battery cluster. The first threshold can be 1.

[0060] In some embodiments, determining distribution information based on battery cluster information includes: if the number of battery packs in each battery cluster is greater than a first threshold and a battery cluster management unit exists in each battery cluster, obtaining a first connection relationship between each battery pack in each battery cluster and a second connection relationship between the battery pack and the battery cluster management unit; and determining distribution information based on the first quantity, the first connection relationship, and the second connection relationship.

[0061] In this embodiment, the first connection relationship can be understood as the series and parallel connection information of each battery pack in the battery cluster, and the second connection relationship can be understood as the connection information between the battery pack and the battery cluster management unit in the battery cluster. Through the first connection relationship and the second connection relationship, the equivalent circuit of each battery cluster can be determined, and then the insulation resistance value of each battery cluster can be calculated.

[0062] Specifically, if the first quantity is not greater than the first threshold, then it can be determined that there is only one battery cluster in the energy storage system. Therefore, the battery cluster management unit and battery pack in the energy storage system are all located in the same battery cluster, and the insulation resistance value of the battery cluster can be directly used as the insulation resistance value of the energy storage system. At the same time, the second and third quantities can be directly used as the distribution information of the battery cluster, battery pack, and battery cluster management unit in the energy storage system. Then, after calculating the insulation resistance value of the battery cluster, the insulation resistance value of the battery cluster can be directly used as the target insulation resistance value of the energy storage system. If the first quantity is greater than the first threshold, it can be determined that there are multiple battery clusters connected in parallel in the energy storage system. At this time, the number of battery packs and the number of battery cluster management units in each battery cluster can be determined. Then, the insulation resistance value of each battery cluster can be calculated by using the distribution information in sequence. After that, the insulation resistance value of the energy storage system can be calculated based on the first quantity and the insulation resistance value of each battery cluster.

[0063] In some embodiments, determining the distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system based on a first quantity, a second quantity, and a third quantity includes: if the second quantity is not greater than a preset second threshold, determining the distribution information based on the second quantity; if the second quantity is greater than the second threshold, determining the distribution information based on the first quantity, the second quantity, and the third quantity.

[0064] Specifically, this application can also determine the distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system based on the second number of battery packs in the energy storage system. For example, the second threshold can also be understood as 1. If the second number is not greater than the second threshold, it can be determined that there is only one battery pack in the energy storage system. In this case, the distribution information can be understood as there is only one battery pack in the energy storage system. Then, the insulation resistance value of the energy storage system can be obtained directly through the insulation resistance value of the battery pack. If the second number is not greater than the second threshold, it can be determined that there are multiple battery packs in the energy storage system. In this case, the parallel connection information of each battery cluster in the energy storage system and the connection information of the battery packs and battery cluster management units in each battery cluster can be determined through the first number, the second number, and the third number. Then, the insulation resistance value of the energy storage system can be obtained based on the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit.

[0065] S130. Based on the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit, obtain the target insulation resistance value of the energy storage system.

[0066] Specifically, after obtaining the distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system, the equivalent circuit of the energy storage system can be determined. Then, based on the number of battery packs, the number of battery cluster management units, the insulation resistance value of the battery packs, and the insulation resistance value of the battery cluster management units, the insulation resistance value of each battery cluster in the energy storage system can be calculated. After that, based on the first quantity and the insulation resistance value of each battery cluster, the insulation resistance value of the energy storage system, i.e., the target insulation resistance value, can be calculated.

[0067] In some embodiments, before obtaining the target insulation resistance value of the energy storage system based on the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit, the method further includes: obtaining the first insulation resistance value of the battery pack and the second insulation resistance value of the battery cluster management unit.

[0068] In this embodiment, the first insulation resistance value and the second insulation resistance value can be obtained through actual measurement. Specifically, the positive and negative insulation resistance values ​​of each battery pack and battery cluster management unit can be measured using an insulation detector. The first and second insulation resistance values ​​can then be obtained based on these values. The insulation detector can be a DC2500V insulation detector.

[0069] In some embodiments, obtaining a target insulation resistance value for the energy storage system based on distribution information, a first insulation resistance value of the battery pack, and a second insulation resistance value of the battery cluster management unit includes: obtaining grounding information of the battery cluster, the battery pack, and the battery cluster management unit; and obtaining the target insulation resistance value for the energy storage system based on the grounding information, distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit.

[0070] In this embodiment, since the insulation resistance value of the energy storage system is calculated by simplifying an equivalent circuit under the premise that the battery cluster, battery pack, and battery cluster management unit are grounded, and the insulation resistance value of the energy storage system is calculated using this equivalent circuit, before obtaining the target insulation resistance value of the energy storage system through distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit, this application also needs to obtain the grounding information of the battery cluster, battery pack, and battery cluster management unit to determine whether the battery cluster, battery pack, and battery cluster management unit are grounded. If they are grounded, the target insulation resistance value of the energy storage system can be directly obtained through distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit. If they are not grounded, the equivalent circuit needs to be adjusted to adjust the calculation method of the insulation resistance value of the energy storage system and the insulation resistance value of the battery cluster.

[0071] In some embodiments, obtaining a target insulation resistance value for the energy storage system based on distribution information, a first insulation resistance value of the battery pack, and a second insulation resistance value of the battery cluster management unit includes: generating a third insulation resistance value for the battery cluster based on distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit; and obtaining the target insulation resistance value for the energy storage system based on distribution information and the third insulation resistance value.

[0072] In this embodiment, the distribution information can be understood as the first number of battery clusters in the energy storage system, the number of battery packs in each battery cluster, and the number of battery cluster management units. The number of battery packs in each battery cluster, the number of battery cluster management units, the first insulation resistance value of the battery packs, and the second insulation resistance value of the battery cluster management units can be calculated using the calculation formula for the resistance value of the equivalent circuit mentioned in this application to obtain the insulation resistance value of each battery cluster, i.e., the third insulation resistance value. Then, the target insulation resistance value of the energy storage system can be calculated based on the third insulation resistance value and the first number of battery clusters in the energy storage system.

[0073] In some embodiments, the method for obtaining the insulation resistance of an energy storage system further includes: obtaining the actual insulation resistance value of the energy storage system; comparing the target insulation resistance value of the energy storage system with the actual insulation resistance value to obtain comparison information of the target insulation resistance value.

[0074] In this embodiment, the comparison information is the difference between the target insulation resistance value and the actual insulation resistance value of the energy storage system. The difference information can be used to determine whether the method of obtaining the insulation resistance value of the energy storage system in this application is accurate.

[0075] For example, suppose the energy storage system includes six battery clusters, each cluster comprising eight battery packs and a cluster management unit, with each battery pack and cluster management unit in each cluster set to the same insulation resistance value. In this case, using an insulation tester to test the actual insulation resistance value of the energy storage system, the insulation resistance value of each battery cluster, and the battery packs and cluster management unit in one of the clusters, can be characterized using Table 1, as shown in Table 1:

[0076] Table 1 shows the detection values ​​of each insulation resistance value.

[0077]

[0078]

[0079] As shown in Table 1, adding the negative and positive resistance values ​​of the battery pack and battery cluster management unit and then dividing by 2 yields their respective insulation resistance values. At this point, the insulation resistance values ​​of the battery pack and battery cluster management unit within the battery cluster are relatively close, therefore the average insulation resistance value R1 (actual insulation resistance value) of the battery pack and battery cluster management unit can be obtained as approximately 730 MΩ. If the formula is used... Calculating the target insulation resistance value R0 of the battery cluster yields a value of 81.11 MΩ. As shown in Table 1, the insulation resistance values ​​of the six battery clusters are relatively similar, therefore the average insulation resistance value R2 (the actual insulation resistance value of the battery cluster) is approximately 81 MΩ. This demonstrates that the target insulation resistance value of the battery cluster calculated in this application based on the actual insulation resistance values ​​of the battery pack and the battery cluster management unit differs from the actually detected insulation resistance value of the battery cluster (i.e., the actual insulation resistance of the battery cluster) by only 0.11 MΩ. The difference is small, therefore the method used to calculate the target insulation resistance value of the battery cluster is feasible.

[0080] Furthermore, regarding the actual insulation resistance value of the energy storage system, as shown in Table 1, the insulation resistance value R3 obtained by adding the negative electrode resistance value and the positive electrode resistance value of the energy storage system and dividing by 2 can be taken as the actual insulation resistance value of the energy storage system, i.e., R3 = 16MΩ. Since the target insulation resistance value R0 of the battery cluster was calculated to be 81.11MΩ, if the formula is used... The target insulation resistance value R of the energy storage system is calculated to be 13.52 MΩ. This shows a resistance difference of 2.48 MΩ between R and R3. This significant difference is due to two reasons: firstly, variations in human measurement; and secondly, the fact that only the target insulation resistance value of a single battery cluster was considered and used as the target insulation resistance value for each cluster, leading to substantial errors. Therefore, to improve the accuracy of the target insulation resistance value of the energy storage system, it is necessary to obtain the insulation resistance value of each battery pack and each battery cluster management unit. This will allow for a more precise determination of the target insulation resistance value of the energy storage system.

[0081] In the method for obtaining the insulation resistance of an energy storage system provided in this application embodiment, a first number of battery clusters, a second number of battery packs, and a third number of battery cluster management units are obtained; the distribution information of the battery clusters, battery packs, and battery cluster management units in the energy storage system is determined based on the first, second, and third numbers; and the target insulation resistance value of the energy storage system is obtained based on the distribution information, the first insulation resistance value of the battery packs, and the second insulation resistance value of the battery cluster management units. This application solves the technical problem of a large difference between the actual and theoretical values ​​of the insulation resistance of the energy storage system, resulting in low accuracy, and can thus provide a basis for subsequently providing standard values ​​for the insulation resistance of the energy storage system.

[0082] This application also provides an insulation resistance acquisition device 200 for an energy storage system, which is used to perform any of the aforementioned methods for acquiring the insulation resistance of an energy storage system.

[0083] Specifically, please refer to Figure 6 , Figure 6 This is a schematic block diagram of the insulation resistance acquisition device 200 for an energy storage system provided in the embodiments of this application.

[0084] like Figure 6 As shown, the insulation resistance acquisition device 200 of the energy storage system includes: a first acquisition unit 210, a determination unit 220, and a second acquisition unit 230.

[0085] The first acquisition unit 210 is used to acquire a first number of battery clusters, a second number of battery packs, and a third number of battery cluster management units; the determination unit 220 is used to determine the distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system based on the first number, the second number, and the third number; the second acquisition unit 230 is used to acquire the target insulation resistance value of the energy storage system based on the distribution information, the first insulation resistance value of the battery packs, and the second insulation resistance value of the battery cluster management units.

[0086] The insulation resistance acquisition device 200 for an energy storage system provided in this application embodiment is used to perform the above-mentioned acquisition of a first number of battery clusters, a second number of battery packs, and a third number of battery cluster management units; determine the distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system based on the first number, the second number, and the third number; and acquire the target insulation resistance value of the energy storage system based on the distribution information, the first insulation resistance value of the battery packs, and the second insulation resistance value of the battery cluster management units.

[0087] It should be noted that those skilled in the art can clearly understand that the specific implementation process of the insulation resistance acquisition device 200 and each unit of the above-mentioned energy storage system can be referred to the corresponding description in the foregoing method embodiments. For the sake of convenience and brevity, it will not be repeated here.

[0088] The insulation resistance acquisition device 200 for the aforementioned energy storage system can be implemented as a computer program, which can, for example... Figure 7 It runs on the electronic device shown.

[0089] Please see Figure 7 , Figure 7 This is a schematic block diagram of an electronic device provided in an embodiment of this application. The electronic device 300 can be a terminal, which can be a cloud-based terminal device, a vehicle-mounted terminal device, a smartphone, a tablet computer, a laptop computer, a desktop computer, a personal digital assistant, and a wearable device, etc.

[0090] See Figure 7 The electronic device 300 includes a processor 302, a memory, and a network interface 305 connected via a system bus 301. The memory may include a non-volatile storage medium 303 and internal memory 304.

[0091] The non-volatile storage medium 303 may store an operating system 3031 and a computer program 3032. The computer program 3032 includes program instructions that, when executed, cause the processor 302 to perform a method for obtaining the insulation resistance of an energy storage system.

[0092] The processor 302 provides computing and control capabilities to support the operation of the entire electronic device 300.

[0093] The internal memory 304 provides an environment for the operation of the computer program 3032 in the non-volatile storage medium 303. When the computer program 3032 is executed by the processor 302, the processor 302 can execute a method for obtaining the insulation resistance of an energy storage system.

[0094] This network interface 305 is used for network communication with other devices. Those skilled in the art will understand that... Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device 300 to which the present application is applied. The specific electronic device 300 may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0095] The processor 302 is used to run a computer program 3032 stored in the memory to perform the following steps: obtaining a first number of battery clusters, a second number of battery packs, and a third number of battery cluster management units; determining the distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system based on the first, second, and third numbers; and obtaining the target insulation resistance value of the energy storage system based on the distribution information, the first insulation resistance value of the battery packs, and the second insulation resistance value of the battery cluster management units.

[0096] It should be understood that in the embodiments of this application, the processor 302 may be a central processing unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0097] According to one aspect of this application, a computer program product or computer program is also provided, comprising computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the following steps: obtaining a first number of battery clusters, a second number of battery packs, and a third number of battery cluster management units; determining, based on the first, second, and third numbers, the distribution information of the battery clusters, battery packs, and battery cluster management units in an energy storage system; and obtaining a target insulation resistance value of the energy storage system based on the distribution information, a first insulation resistance value of the battery packs, and a second insulation resistance value of the battery cluster management units.

[0098] It will be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program includes program instructions and can be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the process steps of the embodiments of the above methods.

[0099] Therefore, this application also provides a storage medium. This storage medium can be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program includes program instructions. When executed by a processor, the program instructions cause the processor to perform the following steps: obtaining a first number of battery clusters, a second number of battery packs, and a third number of battery cluster management units; determining the distribution information of the battery clusters, battery packs, and battery cluster management units in the energy storage system based on the first, second, and third numbers; and obtaining a target insulation resistance value of the energy storage system based on the distribution information, a first insulation resistance value of the battery packs, and a second insulation resistance value of the battery cluster management units.

[0100] The storage medium can be any computer-readable storage medium that can store program code, such as a USB flash drive, external hard drive, read-only memory (ROM), magnetic disk, or optical disk.

[0101] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this application.

[0102] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is merely a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0103] The steps in the methods of this application embodiment can be adjusted, merged, or deleted according to actual needs. The units in the apparatus of this application embodiment can be merged, divided, or deleted according to actual needs. Furthermore, the functional units in the various embodiments of 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.

[0104] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part 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 an electronic device (which may be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application.

[0105] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for obtaining the insulation resistance of an energy storage system, characterized in that, The energy storage system includes at least one battery cluster, each battery cluster including at least one battery pack and a battery cluster management unit, wherein the battery cluster, the battery pack, and the battery cluster management unit are all grounded; the method includes: Obtain a first number of battery clusters, a second number of battery packs, and a third number of battery cluster management units; The distribution information of the battery cluster, the battery pack, and the battery cluster management unit in the energy storage system is determined based on the first quantity, the second quantity, and the third quantity. Based on the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit, the target insulation resistance value of the energy storage system is obtained. The target insulation resistance value of the energy storage system is calculated according to the following formula: Wherein, R is the target insulation resistance value of the energy storage system, Ra is the insulation resistance value of each battery pack and high-voltage box, n1 is the number of battery clusters, n2 and n3 are the number of battery packs and high-voltage boxes in each battery cluster, respectively, the high-voltage box is equivalent to the battery cluster management unit, the insulation resistance value of each battery cluster is consistent, and the insulation resistance value of each battery pack and high-voltage box is consistent.

2. The method for obtaining the insulation resistance of an energy storage system according to claim 1, characterized in that, The step of determining the distribution information of the battery cluster, the battery pack, and the battery cluster management unit in the energy storage system based on the first quantity, the second quantity, and the third quantity includes: If the first quantity is not greater than a preset first threshold, the distribution information is determined based on the second quantity and the third quantity; If the first quantity is greater than the first threshold, obtain the battery cluster information for each battery cluster; The distribution information is determined based on the battery cluster information.

3. The method for obtaining the insulation resistance of an energy storage system according to claim 2, characterized in that, Determining the distribution information based on the battery cluster information includes: If the number of battery packs in each battery cluster is greater than the first threshold and the battery cluster management unit exists in each battery cluster, obtain the first connection relationship between each battery pack in each battery cluster and the second connection relationship between the battery pack and the battery cluster management unit; The distribution information is determined based on the first quantity, the first connection relationship, and the second connection relationship.

4. The method for obtaining the insulation resistance of an energy storage system according to claim 1, characterized in that, The step of determining the distribution information of the battery cluster, the battery pack, and the battery cluster management unit in the energy storage system based on the first quantity, the second quantity, and the third quantity includes: If the second quantity is not greater than a preset second threshold, the distribution information is determined based on the second quantity; If the second quantity is greater than the second threshold, the distribution information is determined based on the first quantity, the second quantity, and the third quantity.

5. The method for obtaining the insulation resistance of an energy storage system according to claim 1, characterized in that, The step of obtaining the target insulation resistance value of the energy storage system based on the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit includes: Based on the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit, a third insulation resistance value of the battery cluster is generated. Based on the distribution information and the third insulation resistance value, the target insulation resistance value of the energy storage system is obtained.

6. The method for obtaining the insulation resistance of an energy storage system according to any one of claims 1-5, characterized in that, The method further includes: Obtain the actual insulation resistance value of the energy storage system; The target insulation resistance value of the energy storage system is compared with the actual insulation resistance value to obtain the comparison information of the target insulation resistance value.

7. An energy storage system, characterized in that, The energy storage system obtains the target insulation resistance value using the insulation resistance acquisition method of the energy storage system according to any one of claims 1-6; The energy storage system includes multiple battery clusters and a combiner cabinet. The battery clusters are connected in series and parallel and then connected to the combiner cabinet via a busbar. Each battery cluster includes a high-voltage box and multiple battery packs; the battery packs are connected in series and parallel, and then connected in series with the high-voltage box to form the main circuit of the battery cluster. The high-voltage box is equipped with a battery cluster management unit, and the battery pack, the high-voltage box, and the combiner cabinet are all grounded.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method for obtaining the insulation resistance of the energy storage system according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for obtaining the insulation resistance of the energy storage system according to any one of claims 1 to 6.

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