Energy storage system and insulation resistance obtaining method thereof, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses an energy storage system, an insulation resistance obtaining method thereof, electronic equipment and a storage medium. The energy storage system comprises at least one battery cluster, and the battery cluster comprises at least one battery pack and a battery cluster management unit. The method comprises the following steps: acquiring a first number of battery clusters, a second number of battery packs and a third number of battery cluster management units; determining distribution information of the battery clusters, the battery packs and the battery cluster management units in the energy storage system according to the first quantity, the second quantity and the third quantity; and obtaining a target insulation resistance value of the energy storage system according to the distribution information, the first insulation resistance value of the battery pack and the second insulation resistance value of the battery cluster management unit, thereby solving the technical problems of large difference between an actual value and a theoretical value of the insulation resistance of the energy storage system and low accuracy. And a basis can be provided for subsequently providing a standard value of the insulation resistance of the energy storage system.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage system and an insulation resistance acquisition method thereof, an electronic device and a storage medium. Background Art

[0002] With the continuous development of the electrochemical energy storage industry, the requirements for the safety of energy storage systems are becoming higher and higher. Among them, the insulation resistance of the energy storage system is an important indicator to measure its electrical safety performance. The insulation resistance of the energy storage system is usually formulated with reference to the national standard GB / T 36276-2018 "Lithium-ion Batteries for Power Energy Storage" or enterprise standards.

[0003] The national standard stipulates that the ratio of the insulation resistance between the positive electrode of the battery module and the external exposed conductive part, and between the negative electrode of the battery module and the external exposed conductive part of the energy storage system to the nominal voltage shall not be less than 1000Ω, and the ratio of the insulation resistance between the positive electrode of the battery cluster and the external exposed conductive part, and between the negative electrode of the battery cluster and the external exposed conductive part of the energy storage system to the nominal voltage shall not be less than 1000Ω, and the insulation resistance value of the DC1500V energy storage system shall not be less than 1.5MΩ; the enterprise standard generally takes an intermediate value based on the actual test value and the national standard, for example, the insulation resistance value of the battery module shall be not less than 550MΩ or not less than 20MΩ. However, although the insulation resistance value of the energy storage system formulated in the above manner can ensure the safety of the energy storage system, its formulation method is unreasonable, resulting in a large difference between the actual value and the theoretical value of the insulation resistance of the energy storage system, and low accuracy. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present application provides an energy storage system and its insulation resistance acquisition method, electronic device and storage medium, aiming to solve the technical problem in the prior art that the actual value and theoretical value of the insulation resistance of the energy storage system are quite different and the accuracy is low.

[0005] To solve the above problems, in a first aspect, an embodiment of the present application provides a method for obtaining insulation resistance of an energy storage system, wherein the energy storage system includes at least one battery cluster, and the battery cluster includes at least one battery pack and a battery cluster management unit; the method includes:

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

[0007] Determine distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system according to the first quantity, the second quantity, and the third quantity;

[0008] A target insulation resistance value of the energy storage system is acquired according to 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] In a second aspect, an embodiment of the present application further provides an insulation resistance acquisition device for an energy storage system, wherein the energy storage system includes at least one battery cluster, and the battery cluster includes at least one battery pack and a battery cluster management unit; and the method includes:

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

[0011] A determination unit, configured to determine distribution information of battery clusters, battery packs, and battery cluster management units in the energy storage system according to the first quantity, the second quantity, and the third quantity;

[0012] The second acquisition unit is used to acquire a target insulation resistance value of the energy storage system according to 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] In a third aspect, an embodiment of the present application further provides an energy storage system, which adopts 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 a combiner cabinet. After the battery clusters are connected in series and parallel, the busbar is used to connect the combiner cabinet.

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

[0016] A battery cluster management unit is installed in the high-voltage box, and the battery pack, high-voltage box and junction box are all grounded.

[0017] In a fourth aspect, an embodiment of the present application further provides an electronic device, comprising a memory storing a plurality of instructions; a processor loads the instructions from the memory to execute the insulation resistance acquisition method of the energy storage system of the first aspect.

[0018] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a plurality of instructions, wherein the instructions are suitable for a processor to load and execute the insulation resistance acquisition method of the energy storage system of the first aspect.

[0019] In a sixth aspect, an embodiment of the present application further provides a computer program product, including a computer program or instructions, where the computer program or instructions are executed by a processor to implement the method for obtaining the insulation resistance of the energy storage system of the first aspect.

[0020] In the method for obtaining the insulation resistance of an energy storage system provided in the present application, a first number of battery clusters, a second number of battery packs, and a third number of battery cluster management units are obtained, and 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 number, the second number, and the third number. Then, the target 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, thereby solving the technical problem of large difference between the actual value and the theoretical value of the insulation resistance of the energy storage system and low accuracy, and thus providing a basis for subsequently providing the standard value of the insulation resistance of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0023] Figure 2 A first equivalent circuit diagram provided in an embodiment of the present application;

[0024] Figure 3 A second equivalent circuit diagram provided in an embodiment of the present application;

[0025] Figure 4 A third equivalent circuit diagram provided in an embodiment of the present application;

[0026] Figure 5 A schematic flow chart of a method for obtaining insulation resistance of an energy storage system provided in an embodiment of the present application;

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

[0028] Figure 7 It is a schematic block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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 "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

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

[0032] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0033] In addition, in this application, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" etc. appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that 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 connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific implementation situation.

[0034] Embodiments of the present application provide an energy storage system and an insulation resistance acquisition method thereof, an electronic device, and a storage medium.

[0035] To facilitate understanding, the energy storage system is first introduced, and then the method for obtaining the insulation resistance of the energy storage system is introduced in detail based on the energy storage system.

[0036] See also Figure 1 , Figure 1 A schematic block diagram of an energy storage system provided in an embodiment of the present application. Figure 1As shown, an energy storage system includes multiple battery clusters and a busbar cabinet 10. After each battery cluster is connected in parallel, it can be electrically connected to the busbar 10. The busbar cabinet 10 is provided with 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. After each battery pack 30 is connected in series, it is connected in series with the high-voltage box 20 to form a 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 is provided with an equalizing circuit, a main positive switch K3, a main negative switch K4, a first fuse FU1 and a second fuse FU2. The equalizing circuit includes a switch K5 and a switch K6; the battery pack 30 may include multiple battery cells connected in series and parallel and a third fuse FU3. At the same time, the busbar cabinet 10, the high-voltage box 20 and the battery pack 30 are all grounded GND.

[0037] based on Figure 1 As shown in the energy storage system, since each battery cluster is grounded, the battery clusters can be equivalent to being connected in parallel. Figure 2 The equivalent circuit shown. Further, 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 shown in Figure 1 is shown in Figure 2. Figure 2 , Figure 3 as well as Figure 4 The resistors R1, R2, R3, ..., and Rn in FIG. 1 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, ..., and Rn are all R0, the final calculation formula can be: The insulation resistance value of the 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 As shown in the energy storage system, since each battery pack and high-voltage box are grounded, each battery pack and high-voltage box can be equivalent to being connected in series. Figure 2 The equivalent circuit shown. Further, 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 shown. At this time, Figure 2 , Figure 3 as well as Figure 4 The resistor R1 in FIG. 1 can be understood as the insulation resistance of the high-voltage box, and the resistors R2, R3, ..., and 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, ..., and 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 the preset number, wherein the preset number is equal to the sum of the number of battery packs and the number of high-voltage boxes.

[0045] Therefore, when the insulation resistance values ​​of the battery clusters are consistent and the insulation resistance values ​​of the battery packs and the high-voltage box are consistent, the calculation formula for the insulation resistance value of the energy storage system can be:

[0046]

[0047] Among them, 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 the number of high-voltage boxes in each battery cluster, respectively.

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

[0049] See also Figure 5 , Figure 5 A flow chart of a method for obtaining the insulation resistance of an energy storage system provided in an embodiment of the present application. The method for obtaining the insulation resistance of an energy storage system provided in an embodiment of the present application is applied to a terminal device, and the method is executed by an application software installed in the terminal device. The terminal device may be a desktop computer, a laptop computer, a tablet computer, a mobile phone, etc.

[0050] It should be noted that the application scenarios described in the following embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. A person of ordinary skill in the art can know that with the emergence of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0051] The following is a detailed description of the method for obtaining the insulation resistance of the energy storage system.

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

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

[0054] In this embodiment, the first number can be understood as the number of battery clusters in parallel in the energy storage system, the second number can be understood as the number of battery packs in the energy storage system, and the third number can be understood as the number of battery cluster management units in the energy storage system. The battery clusters, battery packs, and battery cluster management units mentioned in this embodiment are all in 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, the present application can determine the distribution information of the battery clusters, battery packs, and battery cluster management units in the energy storage system, and then obtain the 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.

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

[0057] In this embodiment, the distribution information can be understood as the parallel information of each battery cluster in the energy storage system and the connection information of the battery packs in each battery cluster and the battery cluster management unit, 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 number of battery clusters, the second number of battery packs and the third number of battery cluster management units in the energy storage system, the first number and the number of battery packs in each battery cluster and the number of battery cluster management units can be determined, so that the insulation resistance value of the energy storage system can be obtained according to the distribution information, the first insulation resistance value of the battery pack and the second insulation resistance value of the battery cluster management unit.

[0058] In some embodiments, distribution information of battery clusters, battery packs, and battery cluster management units in an energy storage system is determined based on a first quantity, a second quantity, and a third quantity, including: 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, the battery cluster information can be understood as parameter information of each battery cluster in the energy storage system, such as voltage, current, number of battery packs, and whether there is a battery management unit after full charge. Through the battery cluster information of each battery cluster, the number of battery packs and the number of battery cluster management units in each battery cluster can be determined, and then the insulation resistance value of each battery cluster can be calculated in turn as distribution information. Among them, the first threshold value can be 1.

[0060] In some embodiments, distribution information is determined based on battery cluster information, including: if the number of battery packs in each battery cluster is greater than a first threshold and there is a battery cluster management unit in each battery cluster, obtaining a first connection relationship between the battery packs in each battery cluster and a second connection relationship between the battery packs and the battery cluster management unit; determining the distribution information based on the first number, 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 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 in the battery cluster and the battery cluster management unit. 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 number is not greater than the first threshold, then it can be determined that there is only one battery cluster in the energy storage system, and then the battery cluster management unit and the battery pack in the energy storage system are all 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, and at the same time, the second number and the third number can be directly used as the distribution information of the battery cluster, the battery pack and the battery cluster management unit in the energy storage system, and then it is only necessary to calculate the insulation resistance value of the battery cluster and directly use the insulation resistance value of the battery cluster as the target insulation resistance value of the energy storage system; if the first number is greater than the first threshold, it can be determined that there are multiple battery clusters in parallel in the energy storage system, and at this time, the number of battery packs and the number of battery cluster management units in each battery cluster can be determined, and then the insulation resistance value of each battery cluster can be calculated in turn as the distribution information, and then the insulation resistance value of the energy storage system can be calculated based on the first number and the insulation resistance value of each battery cluster.

[0063] In some embodiments, distribution information of battery clusters, battery packs, and battery cluster management units in an energy storage system is determined based on a first quantity, a second quantity, and a third quantity, including: 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.

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

[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, and then the insulation resistance value of each battery cluster in the energy storage system can be calculated according to the number of battery packs in the battery cluster, 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 unit. Thereafter, the insulation resistance value of the energy storage system, i.e., the target insulation resistance value, can be calculated according to the first number and the insulation resistance value of each battery cluster.

[0067] In some embodiments, before obtaining the target insulation resistance value of the energy storage system according to the distribution information, the first insulation resistance value of the battery pack and the second insulation resistance value of the battery cluster management unit, it also 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 after actual measurement. Specifically, the positive insulation resistance value and the negative insulation resistance value of each battery pack and the battery cluster management unit can be measured by an insulation tester, and then the first insulation resistance value and the second insulation resistance value can be obtained according to the positive insulation resistance value and the negative insulation resistance value of each battery pack and the battery cluster management unit. The insulation tester can be a DC2500V insulation tester.

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

[0070] In this embodiment, since the insulation resistance value of the energy storage system calculated by this application is simplified into an equivalent circuit under the premise of grounding the battery cluster, the battery pack and the battery cluster management unit, and the insulation resistance value of the energy storage system is calculated by the equivalent circuit. Therefore, before obtaining the target insulation resistance value of the energy storage system through 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 grounding information of the battery cluster, the battery pack and the battery cluster management unit needs to be obtained to determine whether the battery cluster, the battery pack and the 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 the 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 insulation resistance value of the energy storage system and the calculation method of the insulation resistance value of the battery cluster.

[0071] In some embodiments, a target insulation resistance value of an energy storage system is obtained based on distribution information, a first insulation resistance value of a battery pack, and a second insulation resistance value of a battery cluster management unit, including: generating a third insulation resistance value of the battery cluster 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; and obtaining the target insulation resistance value of the energy storage system based on the 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 unit can be calculated using the calculation formula for the resistance value of the equivalent circuit mentioned in this application to calculate the insulation resistance value of each battery cluster, that is, the third insulation resistance value. Thereafter, 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 the energy storage system further includes: obtaining an actual insulation resistance value of the energy storage system; and comparing a target insulation resistance value of the energy storage system with an actual insulation resistance value to obtain comparison information of the target insulation resistance value.

[0074] In this embodiment, the comparison information is the difference information 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, if the energy storage system includes six battery clusters, each battery cluster includes eight battery packs and a battery cluster management unit, and each battery pack in each battery cluster and the battery cluster management unit are set to the same insulation resistance value. At this time, an insulation tester is used to test the actual insulation resistance value of the energy storage system, the insulation resistance value of each battery cluster, the battery packs in one of the battery clusters, and the battery cluster management unit, which can be characterized by Table 1, as shown in Table 1:

[0076] Table 1 Detection of various insulation resistance values

[0077]

[0078]

[0079] As can be seen from Table 1, the insulation resistance values ​​of the battery pack and the battery cluster management unit can be obtained by adding the negative electrode resistance value and the positive electrode resistance value and dividing by 2. At this time, the insulation resistance values ​​of the battery pack and the battery cluster management unit in the battery cluster are slightly different, so the average insulation resistance value R1 (actual insulation resistance value) of the battery pack and the battery cluster management unit can be obtained to be approximately 730MΩ. If the formula is used By calculating the target insulation resistance value R0 of the battery cluster, it can be obtained that the target insulation resistance value R0 of the battery cluster is 81.11MΩ. As can be seen from Table 1, the insulation resistance values ​​of the six battery clusters are also slightly different, so the average insulation resistance value R2 of each battery cluster (the actual insulation resistance value of the battery cluster) is approximately 81MΩ. It can be seen that the target insulation resistance value of the battery cluster calculated by the present application based on the actual insulation resistance value of the battery pack and the actual insulation resistance value of the battery cluster management unit is 0.11MΩ different from the actually detected insulation resistance value of the battery cluster, that is, the actual insulation resistance of the battery cluster. The difference is small, so the method of calculating the target insulation resistance value of the battery cluster is feasible.

[0080] Furthermore, for the actual insulation resistance value of the energy storage system, it can be seen from Table 1 that 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 used as the actual insulation resistance value of the energy storage system, that is, R3 = 16MΩ. Since the target insulation resistance value R0 of the battery cluster is calculated as 81.11MΩ, if the formula is used By calculating the target insulation resistance value R of the energy storage system, we can get the target insulation resistance value R of the energy storage system to be 13.52MΩ. It can be seen that the resistance value difference between R and R3 is 2.48MΩ. The reason why the resistance value difference is large is due to two reasons. One is the difference in human testing, and the other is that only the target insulation resistance value of one battery cluster is considered and used as the target insulation resistance value of each battery cluster, resulting in a large error. Therefore, in order 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, so that the target insulation resistance value of the energy storage system can be accurately obtained.

[0081] In the method for obtaining the insulation resistance of the energy storage system provided in the embodiment of the present application, the first number of battery clusters, the second number of battery packs, and the 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 according to the first number, the second number, and the third number; the target insulation resistance value of the energy storage system is obtained according to 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 present application solves the technical problem that the actual value of the insulation resistance of the energy storage system is greatly different from the theoretical value and the accuracy is low, and can provide a basis for the subsequent provision of the standard value of the insulation resistance of the energy storage system.

[0082] The embodiment of the present application further provides an insulation resistance acquisition device 200 for an energy storage system, which is used to execute any embodiment of the insulation resistance acquisition method for the energy storage system described above.

[0083] Specifically, see Figure 6 , Figure 6 It is a schematic block diagram of the insulation resistance acquisition device 200 of the energy storage system provided in an embodiment of the present 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 the 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 pack, and the second insulation resistance value of the battery cluster management unit.

[0086] The insulation resistance acquisition device 200 of the energy storage system provided in the embodiment of the present application is used to execute the above-mentioned acquisition of the first number of battery clusters, the second number of battery packs, and the third number of battery cluster management units; determine the distribution information of the battery clusters, battery packs, and battery cluster management units in the energy storage system according to the first number, the second number, and the third number; and acquire the target insulation resistance value of the energy storage system according to the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit.

[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 refer to the corresponding description in the aforementioned method embodiment, and for the convenience and brevity of description, it will not be repeated here.

[0088] The insulation resistance acquisition device 200 of the energy storage system can be implemented in the form of a computer program. The computer program can be used in Figure 7 The electronic device shown is running.

[0089] See also Figure 7 , Figure 7 300 is a schematic block diagram of an electronic device provided in an embodiment of the present application. The electronic device 300 may be a terminal, wherein the terminal may be a cloud, a vehicle-mounted terminal device, a smart phone, a tablet computer, a laptop computer, a desktop computer, a personal digital assistant, a wearable device, etc.

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

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

[0092] The processor 302 is used to provide 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] The network interface 305 is used to communicate with other devices over the network. Figure 7 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device 300 to which the scheme of 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 a different arrangement of components.

[0095] The processor 302 is used to run a computer program 3032 stored in the memory to implement 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 distribution information of the battery clusters, battery packs, and battery cluster management units in the energy storage system according to the first number, the second number, and the third number; and obtaining a target insulation resistance value of the energy storage system according to the distribution information, a first insulation resistance value of the battery pack, and a second insulation resistance value of the battery cluster management unit.

[0096] It should be understood that in the embodiment of the present application, the processor 302 may be a central processing unit (CPU), and the processor 302 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0097] According to one aspect of the present application, a computer program product or computer program is also provided, the computer program product or computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device implements 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 according to the first number, the second number, and the third number; obtaining the target insulation resistance value of the energy storage system according to the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit.

[0098] It can be understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program includes program instructions, and the computer program 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 embodiment of the above method.

[0099] Therefore, the present application also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor, the processor performs 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 distribution information of battery clusters, battery packs, and battery cluster management units in an energy storage system based on the first number, the second number, and the third number; obtaining a target insulation resistance value of the energy storage system based on the distribution information, a first insulation resistance value of the battery pack, and a second insulation resistance value of the battery cluster management unit.

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

[0101] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

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

[0103] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs. The units in the device of the embodiment of the present application can be combined, divided and deleted according to actual needs. In addition, the functional units in the various embodiments of the present 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 in the form of 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 the present application is essentially 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, and the computer software product is stored in a storage medium, including a number of instructions for an electronic device (which can be a personal computer, terminal, or network device, etc.) to perform all or part of the steps of the various embodiments of the present application.

[0105] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for obtaining insulation resistance of an energy storage system, characterized in that: The energy storage system includes at least one battery cluster, and the battery cluster includes at least one battery pack and a battery cluster management unit; the method includes: Acquire a first number of the battery clusters, a second number of the battery packs, and a third number of the battery cluster management units; Determine distribution information of the battery cluster, the battery pack, and the battery cluster management unit in the energy storage system according to the first quantity, the second quantity, and the third quantity; A target insulation resistance value of the energy storage system is acquired according to the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit.

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

3. The method for obtaining the insulation resistance of the energy storage system according to claim 2, characterized in that: The determining the distribution information according to 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, obtaining a first connection relationship between the battery packs in each battery cluster and a second connection relationship between the battery packs and the battery cluster management unit; The distribution information is determined according to the first quantity, the first connection relationship, and the second connection relationship.

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

5. The method for obtaining the insulation resistance of the energy storage system according to claim 1, characterized in that: Before acquiring the target insulation resistance value of the energy storage system according to 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: A first insulation resistance value of the battery pack and a second insulation resistance value of the battery cluster management unit are obtained.

6. The method for obtaining the insulation resistance of the energy storage system according to claim 1, characterized in that: The step of acquiring a target insulation resistance value of the energy storage system according to 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: Acquiring grounding information of the battery cluster, the battery pack, and the battery cluster management unit; A target insulation resistance value of the energy storage system is acquired according to the grounding information, the distribution information, the first insulation resistance value of the battery pack, and the second insulation resistance value of the battery cluster management unit.

7. The method for obtaining the insulation resistance of an energy storage system according to claim 1, characterized in that: The step of acquiring a target insulation resistance value of the energy storage system according to 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: generating a third insulation resistance value of the battery cluster according to 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 target insulation resistance value of the energy storage system is acquired according to the distribution information and the third insulation resistance value.

8. The method for obtaining the insulation resistance of an energy storage system according to any one of claims 1 to 7, characterized in that: The method further comprises: Obtaining an 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 comparison information of the target insulation resistance value.

9. An energy storage system, characterized in that: The energy storage system adopts the insulation resistance acquisition method of the energy storage system described in any one of claims 1 to 8 to obtain the insulation resistance value; The energy storage system comprises a plurality of battery clusters and a combiner cabinet, wherein each of the battery clusters is connected in series and parallel and then electrically connected to the combiner cabinet using a busbar; Each battery cluster includes a high-voltage box and a plurality of battery packs; each battery pack is connected in series and in parallel and then in series with the high-voltage box to form a main circuit of the battery cluster; A battery cluster management unit is arranged in the high-voltage box, and the battery pack, the high-voltage box and the combiner cabinet are all grounded.

10. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for obtaining the insulation resistance of the energy storage system according to any one of claims 1 to 8 are implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for obtaining the insulation resistance of an energy storage system according to any one of claims 1 to 8 are implemented.

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