Insulation detection circuit and insulation failure detection method and device thereof

Abstract

The embodiment of the invention discloses an insulation detection circuit and an insulation failure detection method and device thereof. The insulation detection circuit comprises a clamping circuit, an energy storage unit and detection equipment, wherein the energy storage unit comprises a plurality of batteries which are connected with one another; the first end of the clamping circuit is connected with the positive electrode of the energy storage unit, the second end of the clamping circuit is connected with the negative electrode of the energy storage unit, and the first end and the second end of the clamping circuit are connected to a power supply; the intermediate potential of the energy storage unit is connected with the intermediate potential of the clamping circuit and the detection equipment, and the intermediate potential of the clamping circuit is grounded. According to the insulation detection circuit provided by the embodiment of the invention, the detection efficiency of battery insulation failure can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to an insulation detection circuit, an insulation failure detection method, and a device therefor. Background Art

[0002] To improve the safety of energy storage, it is necessary to perform insulation detection on an energy storage system including multiple batteries to timely detect whether the batteries in the energy storage system have insulation failure. In related technologies, the national standard method is used to perform insulation detection on the batteries in the energy storage system, that is, by switching the state of a switch, the voltage of the positive electrode of the battery with respect to the ground and the voltage of the negative electrode of the battery with respect to the ground are collected, so as to determine whether the battery has insulation failure.

[0003] However, when using this method to perform insulation detection on the batteries in a directly-connected DC energy storage system, since there is a clamping circuit in the directly-connected DC energy storage system, when the state of the switch is switched, the equivalent resistance of the clamping circuit will change accordingly, which causes the voltage of the clamping circuit to also change. To ensure the accuracy of the insulation detection result, it is necessary to wait until the voltage of the clamping circuit reaches a steady state before performing insulation detection, which affects the detection efficiency of the insulation detection. Summary of the Invention

[0004] In view of the above problems, this application provides an insulation detection circuit, an insulation failure detection method, and a device therefor, which can improve the detection efficiency of insulation detection on batteries.

[0005] In a first aspect, an embodiment of this application provides an insulation detection circuit, including a clamping circuit, an energy storage unit, and a detection device. The energy storage unit includes a plurality of interconnected batteries; a first end of the clamping circuit is connected to the positive electrode of the energy storage unit, a second end of the clamping circuit is connected to the negative electrode of the energy storage unit, and the first end and the second end of the clamping circuit are connected to a power supply; the intermediate potential of the energy storage unit is connected to the intermediate potential of the clamping circuit and the detection device, and the intermediate potential of the clamping circuit is grounded.

[0006] In the technical solution of the embodiment of this application, since the intermediate potential of the energy storage unit is connected to the intermediate potential of the clamping circuit, and the detection device is connected to the intermediate potential of the energy storage unit, when there is no insulation failure of the battery in the energy storage unit, the voltage difference between the two ends of the detection device is fixed, so that the detection device can determine the current that should be detected when there is no insulation failure of the battery. Therefore, when the energy storage unit is operating normally, the detection device can directly perform current detection to determine whether there is insulation failure of the battery in the energy storage unit, without switching the switch, thus not affecting the clamping circuit, and further improving the detection efficiency of insulation detection on the battery.

[0007] In some embodiments, the clamping circuit includes a first resistor unit and a second resistor unit; a first end of the first resistor unit is connected to the positive electrode of the energy storage unit, and a second end of the first resistor unit is connected to a first end of the second resistor unit; the first end of the second resistor unit is connected to the detection device, and a second end of the second resistor unit is connected to the negative electrode of the energy storage unit; the resistance values of the first resistor unit and the second resistor unit are the same. Since the clamping circuit only includes the first resistor unit and the second resistor unit and there is no capacitor, even if the equivalent clamping resistance value changes, it will not affect the measurement efficiency of the insulation detection of the battery due to the need to wait for the voltage of the capacitor to reach a steady state.

[0008] In some embodiments, the resistance value between the intermediate potential of the energy storage unit and the detection device is less than that of the first resistor unit or the second resistor unit. So that when the battery in the energy storage unit has an insulation failure, the leakage current will flow through the detection device from the intermediate potential of the energy storage unit, facilitating the detection of the leakage current by the detection device.

[0009] In some embodiments, the energy storage unit includes a plurality of parallel energy storage branches; each energy storage branch includes a plurality of batteries, and the batteries in each energy storage branch are connected in series with each other.

[0010] In some embodiments, the intermediate potential of each energy storage branch is connected to the intermediate potential of the clamping circuit and the detection device. By connecting the intermediate potential of each energy storage branch to the intermediate potential of the clamping circuit and the detection device, when performing insulation detection, the detection device can quickly locate which energy storage branch has an insulation failure, improving the insulation detection efficiency.

[0011] In some embodiments, the insulation detection circuit further includes a first switch unit and a second switch unit; the first switch unit is disposed between the first end of the clamping circuit and the positive electrode of the energy storage unit, and the second switch unit is disposed between the second end of the clamping circuit and the negative electrode of the energy storage unit. Thus, the energy storage unit can be cut off by disconnecting the first switch unit and the second switch unit, effectively suppressing the risk of thermal runaway after the battery in the energy storage unit has an insulation failure.

[0012] In some embodiments, the detection device includes a processor;

[0013] The processor is configured to compare the acquired current value with a target value to obtain an insulation failure detection result of the energy storage unit. By comparing the current value of the intermediate potential with the target value through a detection device, an insulation failure detection result of the battery cells in the energy storage unit is obtained. Such that when the energy storage unit is operating normally, the current comparison can be directly performed through the detection device to determine whether there is an insulation failure of the battery in the energy storage unit without switching the switch, thereby not affecting the clamping circuit, and further improving the detection efficiency of the insulation detection of the battery.

[0014] In some embodiments, the processor is specifically configured to: compare the current value of the intermediate potential point of any energy storage branch in the energy storage unit with the target value corresponding to the energy storage branch to obtain an insulation failure detection result of the energy storage branch. In this way, when there are multiple energy storage branches in the energy storage unit, the energy storage branch with insulation failure can be quickly located, improving the insulation detection efficiency.

[0015] In some embodiments, the processor is further configured to, in response to a received prompt signal, obtain the target value from the intermediate potential of the energy storage branch; wherein, the prompt signal is used to prompt an insulation failure of the battery cell adjacent to the intermediate potential.

[0016] In a second aspect, the present application provides a method for detecting insulation failure of an insulation detection circuit, which is applied to the insulation detection circuit in any of the above embodiments. The method includes: comparing the acquired current value with a target value to obtain an insulation failure detection result of the energy storage unit.

[0017] In the technical solution of the embodiments of the present application, by comparing the current value of the intermediate potential flowing through the clamping circuit and the energy storage unit with the target value, an insulation failure detection result of the energy storage unit is obtained. Such that when the energy storage unit is operating normally, the current detection can be directly performed through the detection device to determine whether there is an insulation failure of the battery in the energy storage unit without switching the switch, thereby not affecting the clamping circuit, and further improving the detection efficiency of the insulation detection of the battery.

[0018] In some embodiments, comparing the acquired current value with a target value to obtain an insulation failure detection result of the energy storage unit includes: comparing the current value of the intermediate potential point of any energy storage branch in the energy storage unit with the target value corresponding to the energy storage branch to obtain an insulation failure detection result of the energy storage unit.

[0019] In some embodiments, the method further includes: in response to a received prompt signal, obtaining the target value from the intermediate potential of the energy storage branch; wherein, the prompt signal is used to prompt an insulation failure of the battery cell adjacent to the intermediate potential.

[0020] In a third aspect, the present application provides an electronic device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it executes the method in the implementation manners of the second aspect.

[0021] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it executes the method in the implementation manners of the second aspect.

[0022] In a fifth aspect, the present application provides a computer program product. When the computer program product runs on a computer, it causes the computer to execute the method in the implementation manners of the second aspect.

[0023] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific implementation manners of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the following detailed description of the preferred implementation manners, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred implementation manners and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0025] Figure 1 is the second structural schematic diagram of the insulation detection circuit for some embodiments of the present application;

[0026] Figure 2 is the structural schematic diagram of the clamping circuit for some embodiments of the present application;

[0027] Figure 3 is the third structural schematic diagram of the insulation detection circuit for some embodiments of the present application;

[0028] Figure 4 is the fourth structural schematic diagram of the insulation detection circuit for some embodiments of the present application;

[0029] Figure 5 is the equivalent circuit schematic diagram of the insulation detection circuit for some embodiments of the present application;

[0030] Figure 6 is the equivalent circuit schematic diagram of the insulation detection circuit for some embodiments of the present application;

[0031] Figure 7 is the fifth structural schematic diagram of the insulation detection circuit for some embodiments of the present application;

[0032] Figure 8 The sixth structural schematic diagram of the insulation detection circuit according to some embodiments of the present application;

[0033] Figure 9 The flowchart of the insulation failure detection method for the insulation detection circuit according to some embodiments of the present application;

[0034] Figure 10 The structural schematic diagram of the insulation failure detection device for the insulation detection circuit according to some embodiments of the present application;

[0035] Figure 11 The structural schematic diagram of the electronic device according to some embodiments of the present application.

[0036] Some of the reference numerals in the specific embodiments are as follows:

[0037] 10 - clamping circuit; 20 - energy storage unit; 30 - detection device; 40 - power circuit; energy storage branch 201; 202 - first resistor unit; 203 - second resistor unit; R - resistor; 3,01 - detection module; S1 - first switch unit; S2 - first switch unit; 400 - electronic device; 401 - processor; 402 - memory; 403 - communication bus. Specific embodiments

[0038] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined.

[0041] Reference to "embodiment" in this document means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0043] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0044] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "linkage", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0045] To improve the safety of energy storage, it is necessary to perform insulation detection on an energy storage system including multiple batteries to timely detect whether the batteries in the energy storage system have insulation failure. In related technologies, the national standard method is usually used to perform insulation detection on the batteries in the energy storage system. That is, the ground voltage of the positive electrode of the battery and the ground voltage of the negative electrode of the battery are collected through a switching switch to determine whether the battery has insulation failure.

[0046] In order to implement insulation detection for a DC-direct-connected energy storage system, in some embodiments, since there is a clamping circuit in the DC-direct-connected energy storage system, the positive electrode of the battery is connected to the first end of the first resistor, the first end of the first switch, and the clamping circuit. The second end of the first resistor is grounded, and the second end of the first switch is connected to two measuring resistors. The two measuring resistors are connected to the two clamping resistors of the clamping circuit and the ground potential. The negative electrode of the battery is connected to the first end of the second resistor, the first end of the second switch, and the clamping circuit. The second end of the second resistor is grounded, and the second end of the second switch is connected to two measuring resistors. By switching the first switch and the second switch, the voltage of the positive electrode of the battery with respect to the ground and the voltage of the negative electrode of the battery with respect to the ground are collected, thereby realizing the insulation detection of the battery.

[0047] However, when the first switch or the second switch changes its state in this detection method, the parallel equivalent resistance of the clamping resistor and the measuring resistor in the clamping circuit will change accordingly, which causes the voltage of the capacitor in the clamping circuit to also change. To ensure the accuracy of the insulation detection result, the insulation detection can only be carried out after the voltage of the clamping circuit reaches a steady state, which affects the detection efficiency of the insulation detection. In addition, due to the change in the parallel equivalent resistance, the voltage of the clamping circuit will change, resulting in an unstable potential of the clamping circuit and affecting the clamping effect.

[0048] To address the above technical problems, an embodiment of the present application provides an insulation detection circuit, including a clamping circuit, an energy storage unit, and a detection device. The energy storage unit includes a plurality of interconnected batteries. The first end of the clamping circuit is connected to the positive electrode of the energy storage unit, the second end of the clamping circuit is connected to the negative electrode of the energy storage unit, and the first end and the second end of the clamping circuit are connected to a power supply. The intermediate potential of the energy storage unit is connected to the intermediate potential of the clamping circuit and the detection device, and the intermediate potential of the clamping circuit is grounded. Since the intermediate potential of the energy storage unit is connected to the intermediate potential of the clamping circuit and the detection device is connected to the intermediate potential of the energy storage unit, when there is no battery insulation failure in the energy storage unit, the voltage difference between the two ends of the detection device is fixed, enabling the detection device to determine the current that should be detected when there is no battery insulation failure. Therefore, when the energy storage unit is operating normally, the current can be directly detected by the detection device to determine whether there is a battery insulation failure in the energy storage unit without switching the switch, thus not affecting the clamping circuit and improving the detection efficiency of the battery insulation detection.

[0049] According to an insulation detection circuit provided by some embodiments of the present application, as Figure 1As shown, the insulation detection circuit includes a clamping circuit 10, an energy storage unit 20, and a detection device 30. The energy storage unit 20 includes a plurality of interconnected batteries. The first end of the clamping circuit 10 is connected to the positive electrode of the energy storage unit 20, and the second end of the clamping circuit 10 is connected to the negative electrode of the energy storage unit 20. The first end and the second end of the clamping circuit 10 are connected to a power supply. The intermediate potential of the energy storage unit 20 is connected to the intermediate potential of the clamping circuit 10 and the detection device 30, and the intermediate potential of the clamping circuit 10 is grounded. Among them, the detection device 30 includes an electrical signal acquisition unit for collecting current signals, such as a current sensor. This electrical signal acquisition unit is connected to the intermediate potential of the clamping circuit 10 and the intermediate potential of the energy storage unit 20 for collecting the electrical signals of the intermediate potential.

[0050] In some embodiments, the first end and the second end of the clamping circuit 10 can be connected to both ends of a power module 40 to connect to a power supply through the power module 40. The intermediate potential of the clamping circuit refers to the position in the clamping circuit 10 where the voltage is 1 / 2 of the terminal voltage of the clamping circuit 10, that is, the position where the voltage is the intermediate value between the ground potential and the high potential of the clamping circuit. Exemplarily, as Figure 2 shown, the clamping circuit 10 may include a first resistor 101, a second resistor 102, a first capacitor C2, and a second capacitor C3. The first capacitor C2 and the second capacitor C3 have the same model. The first end of the first capacitor C2 is connected to the first end of the first resistor 101 and the positive electrode of the energy storage unit 20, and the second end of the first capacitor C2 is connected to the first end of the second capacitor C3. The second end of the second capacitor C3 is connected to the negative electrode of the energy storage unit 20 and the second end of the second resistor 102, and the second end of the first resistor 101 is connected to the first end of the second resistor 102. Between the first resistor 101 and the second resistor 102, the position where the voltage is 1 / 2 of the terminal voltage of the clamping circuit 10 is the intermediate potential of the clamping circuit. Similarly, the intermediate potential of the energy storage unit refers to the position in the energy storage unit 20 where the voltage is 1 / 2 of the terminal voltage of the energy storage unit. Exemplarily, assuming that the clamping circuit 10 is formed by connecting an even number of resistors with the same specifications in series, or by connecting an even number of resistors with the same specifications in series and then connecting N capacitors, the midpoint of each resistor in the clamping circuit 10 is the intermediate potential. Assuming that the energy storage unit 20 is formed by connecting an even number of batteries with the same specifications in series, the midpoint of the energy storage unit 20 is the intermediate potential. The intermediate potentials of the clamping circuit 10 and the energy storage circuit are grounded, such as being connected to the platform rack where the energy storage unit 20 is placed to be grounded through the platform rack.

[0051] The detection device 30 may include a current detector for performing current measurement. The input end of the detection device 30 is connected to the intermediate potential of the clamping circuit 10 and the intermediate potential of the energy storage unit 20. Since the detection device 30 is connected to the intermediate potential of the clamping circuit 10 and the intermediate potential of the energy storage unit 20, when the insulation detection circuit is operating normally, that is, when all the batteries in the energy storage unit 20 do not have insulation failure, as Figure 2 shown, the voltages of the upper and lower parts of the intermediate potential of the energy storage unit 20 are exactly equal, and the leakage current is 0; when the battery of the energy storage unit 20 has insulation failure, the voltages of the upper and lower parts of the intermediate potential of the energy storage unit 20 are unbalanced, generating a leakage current. At this time, the detection device 30 can detect a non-zero leakage current, thereby determining that the battery in the energy storage unit 20 has insulation failure.

[0052] Since the intermediate potential of the energy storage unit is connected to the intermediate potential of the clamping circuit, and the detection device is connected to the intermediate potential of the energy storage unit, when there is no battery insulation failure in the energy storage unit, the voltage difference across the detection device is fixed, enabling the detection device to determine the current that should be detected when there is no battery insulation failure. Thus, when the energy storage unit is operating normally, current detection can be directly performed through the detection device to determine whether there is battery insulation failure in the energy storage unit, without the need for switch switching, thereby not affecting the clamping circuit and further improving the detection efficiency of battery insulation detection.

[0053] In some embodiments, as Figure 3 shown, the clamping circuit 10 includes a first resistor unit 202 and a second resistor unit 203; the first end of the first resistor unit 202 is connected to the positive electrode of the energy storage unit 20, and the second end of the first resistor unit 202 is connected to the first end of the second resistor unit 203; the first end of the second resistor unit 203 is connected to the detection device 30, and the second end of the second resistor unit 203 is connected to the negative electrode of the energy storage unit 20; the resistance values of the first resistor unit 202 and the second resistor unit 203 are the same.

[0054] Among them, the first resistor unit 202 or the second resistor unit 203 may be a single current-limiting resistor, or may include a plurality of series or parallel current-limiting resistors. Since the resistance values of the first resistor unit 202 and the second resistor unit 203 are the same, the intermediate position between the first resistor unit 202 and the second resistor unit 203 is the intermediate potential of the clamping circuit 10, which is connected to the intermediate potential of the energy storage unit 20 and the input end of the detection device 30.

[0055] Since the intermediate potential of the detection device 30 is connected to the intermediate potential of the clamping circuit 10 and the intermediate potential of the energy storage unit 20, assuming that the resistance value of the first resistance unit 202 or the second resistance unit 203 of the clamping circuit is R2, and the resistance between the energy storage unit 20 and the detection device 30, such as the resistance of the wire, is R, it can be determined that:

[0056]

[0057] Among them, U0 represents the voltage of the intermediate potential of the energy storage unit, and U1 and U2 respectively represent the voltages on both sides of the intermediate potential of the energy storage unit; as Figure 1 shown, U1 is the voltage of the part above the intermediate potential of the energy storage unit, and U2 is the voltage of the part below the intermediate potential of the energy storage unit.

[0058] That is:

[0059]

[0060] It can be seen from this that the leakage current measured by the detection device 30 is:

[0061]

[0062] That is, when all the batteries of the energy storage unit 20 do not have insulation failure, the voltages of the upper and lower parts of the intermediate potential of the energy storage unit 20 are exactly equal, and the leakage current is 0; when the battery of the energy storage unit 20 has insulation failure, the voltages of the upper and lower parts of the intermediate potential of the energy storage unit 20 are unbalanced, generating a leakage current. At this time, the detection device 30 can detect a non-zero leakage current, thereby determining that the battery in the energy storage unit 20 has insulation failure. In addition, the detection device 30 can also determine the direction of the leakage current according to the positive and negative values of the leakage current, and thus can determine which part the battery with insulation failure appears in. If the leakage current is positive, it can be determined that U2 > U1, and at this time it is determined that the battery with insulation failure is located in the part below the intermediate potential. In addition, the severity of the insulation failure can also be determined according to the magnitude of the leakage current,

[0063] to determine the severity of the insulation failure. Exemplarily, since therefore, after obtaining the leakage current I, the corresponding unbalanced voltage ΔU can be obtained according to the leakage current I. If the magnitude of the unbalanced voltage is larger, it can be determined that the severity of the insulation failure is higher.

[0064] And since the clamping circuit only includes the first resistance unit and the second resistance unit and there is no capacitor, even if the clamping equivalent resistance value changes, it will not affect the measurement efficiency of the battery insulation detection due to waiting for the voltage of the capacitor to reach a steady state.

[0065] To enable the detection device 30 to accurately detect the leakage current, the resistance R between the detection device 30 and the energy storage unit 20 is less than the resistance R2 of the clamping circuit, such as R << R2. Specifically, according to the resistance R2, a corresponding resistance R can be selected and set between the center potential of the detection device 30 and the energy storage unit 20. For example, a wire with a resistance value of R is selected to connect the center potential of the detection device 30 and the energy storage unit 20, so that when the battery in the energy storage unit 20 has insulation failure, the leakage current will flow through the resistance R and the detection device 30, facilitating the detection device 30 to detect the leakage current.

[0066] In some embodiments, such as Figure 4 shown, the energy storage unit 20 includes a plurality of parallel energy storage branches 201; each energy storage branch 201 includes a plurality of batteries, and the batteries in each energy storage branch 201 are connected in series with each other. The positive electrode of each energy storage branch 201 is connected to the first end of the clamping circuit 10, and the negative electrode of each energy storage branch 201 is connected to the second end of the clamping circuit 10.

[0067] The intermediate potential of the energy storage unit 20 can be the intermediate potential of any energy storage branch 201. For example, if a certain energy storage branch 201 of the energy storage unit 20 is formed by connecting an even number of batteries with the same specifications in series, the midpoint of this energy storage branch 201 is the intermediate potential. Exemplarily, the number of batteries in each energy storage branch 201 and the model of the batteries are the same, and at this time, the intermediate potentials of each energy storage branch 201 are the same.

[0068] When all the batteries of the energy storage unit 20 do not have insulation failure, the voltages of the upper and lower parts of the intermediate potential of each energy storage branch 201 are completely equal, and the leakage current is 0; when the battery in a certain energy storage branch 201 of the energy storage unit 20 has insulation failure, the voltages of the upper and lower parts of the intermediate potential of this energy storage branch 201 are unbalanced, generating a leakage current. At this time, the detection device 30 can detect a non-zero leakage current, thereby determining that the battery in a certain energy storage branch 201 has insulation failure.

[0069] As a possible implementation manner, if the battery in the same energy storage branch as the intermediate potential of the energy storage unit 20 has insulation failure, the equivalent circuit at this time is as Figure 5 shown. Assume that the battery voltages on both sides of the insulation failure point are U1 and U3 respectively, the resistance value of the first resistance unit 202 or the second resistance unit 203 of the clamping circuit is R2, and the resistance between the center potential of the energy storage unit 20 and the detection device 30, such as the resistance of the wire, is R. Then it can be determined that

[0070] wherein, R' represents the equivalent resistance of the battery insulation failure to the ground.

[0071] That is:

[0072]

[0073] It can be seen from this that the leakage current measured by the detection device 30 is:

[0074]

[0075] That is, when the battery in the same energy storage branch as the intermediate potential of the energy storage unit 20 has insulation failure, the leakage current detected by the detection device 30 will reach Therefore, when the battery in the same energy storage branch as the intermediate potential of the energy storage unit 20 has insulation failure, the detection device 30 can perform effective detection.

[0076] As another possible implementation manner, if the battery in a different energy storage branch from the intermediate potential of the energy storage unit 20 has insulation failure, the equivalent circuit at this time is as Figure 6 shown. Assuming that the voltages on both sides of the insulation failure point are U1 and U2 respectively, the resistance value of the first resistance unit 202 or the second resistance unit 203 of the clamping circuit is R2, and the resistance between the center potential of the energy storage unit 20 and the detection device 30, such as the resistance of the wire, is R, then it can be determined that:

[0077]

[0078] Among them, U ′ represents the voltage of the target potential, and U represents the voltage across the energy storage branch 201 where the center potential of the energy storage unit 20 is located.

[0079] That is, when the battery in a different energy storage branch from the intermediate potential of the energy storage unit 20 has insulation failure, the leakage current detected by the detection device 30 will reach Therefore, when the battery in a different energy storage branch from the intermediate potential of the energy storage unit 20 has insulation failure, the detection device 30 can also perform effective detection. In this way, when the energy storage unit includes multiple energy storage branches, no matter which energy storage branch has insulation failure, the detection device can perform effective detection, thereby improving the reliability of the insulation detection of the energy storage unit.

[0080] At the same time, the detection device 30 can also determine the direction of the leakage current according to the positive and negative values of the leakage current, and thus can determine which part of each energy storage branch 201 the battery with insulation failure appears in. If the leakage current is positive, it can be determined that the battery with insulation failure is located in the part below the intermediate potential of each energy storage branch 201; on the contrary, it can be determined that the battery with insulation failure is located in the part above the intermediate potential of each energy storage branch 201.

[0081] And to further improve the detection efficiency, in some embodiments, such as Figure 7As shown, the intermediate potential of each energy storage branch 201 is connected to the intermediate potential of the clamping circuit 10 and the detection device 30.

[0082] Exemplarily, the detection device 30 may include a plurality of input terminals, and each input terminal is connected to the intermediate potential of each energy storage branch 201 in one-to-one correspondence. Alternatively, the detection device 30 may include a plurality of detection modules 301, and the input terminals of each detection module 301 are connected to the intermediate potential of each energy storage branch 201 in one-to-one correspondence.

[0083] When the batteries of each energy storage branch 201 do not show insulation failure, the currents detected by the input terminals of each detection module 301 are all 0; if the battery of a certain energy storage branch 201 shows insulation failure, the voltages of the upper and lower parts of the intermediate potential of this energy storage branch 201 are unbalanced, generating a leakage current. At this time, the detection device 30 can detect a non-zero leakage current through the input terminal connected to this energy storage branch 201 or the detection module 301 connected to this energy storage branch 201. At this time, it can be determined that the battery in this energy storage branch 201 has insulation failure.

[0084] By connecting the intermediate potential of each energy storage branch to the intermediate potential of the clamping circuit and the detection device, when performing insulation detection, it is possible to quickly locate which energy storage branch has insulation failure through the detection device, improving the insulation detection efficiency.

[0085] And to improve the safety of insulation detection, in some embodiments, as Figure 8 shown, the insulation detection circuit further includes a first switch unit S1 and a second switch unit S2. The first switch unit S1 is arranged between the first end of the clamping circuit 10 and the positive electrode of the energy storage unit 20, and the second switch unit S2 is arranged between the second end of the clamping circuit 10 and the negative electrode of the energy storage unit 20. Among them, both the first switch unit S1 and the second switch unit S2 can be disconnect switches, circuit breakers or relays, etc.

[0086] When it is necessary to supply energy to the energy storage unit 20 and perform insulation detection, the first switch unit S1 and the second switch unit S2 can be closed to make the insulation detection circuit operate normally. And when the detection device 30 detects that the energy storage unit 20 has insulation failure, the first switch unit S1 and the second switch unit S2 can be disconnected to cut off the energy storage unit 20, so as to effectively suppress the thermal runaway risk after the battery in the energy storage unit has insulation failure. And because the first switch unit S1 and the second switch unit S2 are respectively connected to the positive and negative electrodes of the energy storage unit 20, when the energy storage unit 20 has insulation failure, the first switch unit S1 and the second switch unit S2 can be disconnected simultaneously to completely disconnect the energy storage unit, thus avoiding the situation that a certain switch is stuck and the energy storage unit cannot be disconnected, improving the reliability of the insulation detection circuit.

[0087] In some embodiments, the detection device 20 includes a processor, which may be a signal processor for detecting current. An electric signal acquisition unit may be built into the detection module, so that the processor can implement the acquisition and detection of current. Alternatively, the processor and the electric signal acquisition unit may be independent components. The processor is connected to the electric signal acquisition unit, and the electric signal acquisition unit is used to acquire current and send it to the processor, and the processor is used to receive the current sent by the electric signal acquisition unit and perform detection.

[0088] In some embodiments, the processor is used to compare the obtained current value with a target value to obtain the insulation failure detection result of the energy storage unit. Among them, the target value can be set according to the actual situation. For example, since the detection device is connected to the intermediate potential of the clamping circuit 10 and the energy storage unit 20, if there is no cell insulation failure in the energy storage unit 20, the voltage difference detected by the processor is basically zero, that is, the current detected by the detection device at this time is also zero. Therefore, the target value can be set to zero. If the processor detects that the current value is not zero, it can be determined that the insulation failure detection result is that the cell of the energy storage unit 20 has insulation failure; otherwise, it can be determined that the insulation failure detection result is that the cell of the energy storage unit 20 has no insulation failure.

[0089] Alternatively, the processor may first obtain the absolute value of the current value of the intermediate potential when it is determined that the energy storage unit 20 has no insulation failure, and determine this current value as the target value. When it is necessary to detect whether the energy storage unit 20 has insulation failure, the absolute value of the current value obtained from the intermediate potential is compared with the target value. If the absolute value of the current value is greater than the target value, it can be determined that the insulation failure detection result is that the cell of the energy storage unit 20 has insulation failure; otherwise, it can be determined that the insulation failure detection result is that the cell of the energy storage unit 20 has no insulation failure.

[0090] Alternatively, the processor may detect whether the duration for which the current value is greater than the target value reaches a preset duration. If so, it can be determined that there is cell insulation failure in the battery cluster. Among them, the preset duration can be set according to the actual situation.

[0091] By comparing the current value of the intermediate potential with the target value through the detection device to obtain the insulation failure detection result of the cell in the energy storage unit, it is possible to directly compare the current through the detection device to determine whether there is battery insulation failure in the energy storage unit under the condition that the energy storage unit is operating normally, without switching the switch, so as not to affect the clamping circuit, thereby improving the detection efficiency of battery insulation detection.

[0092] In some embodiments, considering that the energy storage unit 20 includes at least one energy storage branch, such as Figure 5As shown, the energy storage unit 20 includes multiple parallel energy storage branches 200. At this time, to improve the insulation detection efficiency, the processor is specifically configured to:

[0093] Compare the current value of the intermediate potential point of any one of the energy storage branches in the energy storage unit with the corresponding target value of the energy storage branch to obtain the insulation failure detection result of the energy storage branch.

[0094] Among them, since the detection device is connected to the intermediate potential of the energy storage branch 200, if there is no insulation failure of the battery cells in this energy storage branch 200, the voltage difference detected by the processor is basically zero, that is, the current detected by the detection device at this time is also zero. Therefore, the target value corresponding to this energy storage branch 200 can be set to zero. Alternatively, the processor can first obtain the absolute value of the current value of the intermediate potential when it is determined that there is no insulation failure in the energy storage branch 200, so as to determine this current value as the target value corresponding to this energy storage branch 200. When it is necessary to detect whether the energy storage unit 20 has an insulation failure, compare the absolute value of the current value obtained from the intermediate potential of this energy storage branch 200 with the target value. If the absolute value of the current value is greater than the target value, it can be determined that the insulation failure detection result is that the battery cells of this energy storage branch 200 in the energy storage unit 20 have an insulation failure; otherwise, it can be determined that the insulation failure detection result is that the battery cells of this energy storage branch 200 in the energy storage unit 20 have no insulation failure. In this way, when there are multiple energy storage branches in the energy storage unit, the energy storage branch with insulation failure can be quickly located, improving the insulation detection efficiency.

[0095] Considering that in practical applications, the voltage of the center potential may only be close to zero but not zero, in order to improve the accuracy of the insulation failure detection result, in some embodiments, the processor is further configured to: in response to the received prompt signal, obtain the target value from the intermediate potential of the energy storage branch; where the prompt signal is used to prompt the insulation failure of the battery cells adjacent to the intermediate potential of the energy storage branch.

[0096] In some embodiments, when only one of the battery cells adjacent to the intermediate potential of the energy storage branch 200 has an insulation failure, the user can send a prompt signal to the processor to prompt the insulation failure of the battery cells adjacent to this intermediate potential. For example, send a prompt signal to the processor through a user terminal connected to the processor, or send a prompt signal to the processor by turning on the signal switch of the detection device 20. When the processor receives this prompt signal, it means that one of the battery cells adjacent to the intermediate potential in this energy storage branch 200 has an insulation failure. At this time, at the moment of receiving the prompt signal, respond to this prompt signal and detect the current value of the intermediate potential point of this energy storage branch 200, so as to use the detected current value as the target value.

[0097] Considering that the insulation failure of a single battery cell does not cause a short circuit, that is, when a single battery cell has an insulation failure, the current at the intermediate potential may not change. Therefore, the prompt signal can be used to prompt that both battery cells adjacent to the intermediate potential have insulation failures. That is, in the energy storage branch 200, only when both battery cells adjacent to the intermediate potential have insulation failures can the user send a prompt signal to the processor to prompt the insulation failure of the battery cells adjacent to the intermediate potential of the energy storage branch 200. When the processor receives this prompt signal, it means that both battery cells adjacent to the intermediate potential in the energy storage branch 200 have insulation failures. At this time, at the moment of receiving the prompt signal, in response to this prompt signal, the current value at the intermediate point is detected to use the detected current value as the target value. Since the battery cells with insulation failures at this time are the battery cells adjacent to the intermediate potential, the leakage current generated by them under insulation failure is the minimum current that the energy storage branch 200 can generate under insulation failure. That is, when multiple battery cells in the energy storage branch 200 have insulation failures, the current value at the intermediate potential is not less than this target value.

[0098] When it is necessary to detect the insulation failure of the energy storage unit 20, the current value obtained from the intermediate potential of a certain energy storage branch 200 of the energy storage unit 20 can be compared with the target value corresponding to the energy storage branch 200. If the current value is less than the target value, it can be determined that the insulation failure detection result is that the battery cells in the energy storage branch 200 of the energy storage unit 20 do not have insulation failures; if the current value obtained from the intermediate potential is greater than or equal to the target value, it can be determined that the insulation failure detection result is that the battery cells in the energy storage branch 200 of the energy storage unit 20 have insulation failures. In this way, the misjudgment of the insulation failure detection can be reduced, and the accuracy of the insulation failure detection result can be improved.

[0099] Figure 9 The flowchart of a method for detecting insulation failure of an insulation detection circuit provided by an embodiment of the present application is shown. This method for detecting insulation failure of the insulation detection circuit is applied to the insulation detection circuit in any of the above embodiments. Specifically, it can be applied to the detection device 30 in any of the above embodiments.

[0100] In some embodiments, this method for detecting insulation failure of the insulation detection circuit includes:

[0101] S101, comparing the obtained current value with the target value to obtain the insulation failure detection result of the energy storage unit.

[0102] In some embodiments, since the detection device is connected to the intermediate potential of the clamping circuit and the intermediate potential of the energy storage unit, the detection device can pre-determine the current detected when none of the batteries in the energy storage unit have insulation failure as the target value. When it is necessary to detect insulation failure of the insulation detection circuit, the absolute value of the obtained current value can be compared with the target value. If the absolute value of the current value is greater than the target value, it can be determined that the battery in the energy storage unit has insulation failure.

[0103] Exemplarily, the insulation detection circuit can be as Figure 1 or Figure 3 shown. Since the detection device 30 is connected to the intermediate potential of the clamping circuit 10 and the intermediate potential of the energy storage unit, and when the insulation detection circuit is operating normally, that is, when none of the batteries in the energy storage unit 20 have insulation failure, the voltages of the upper and lower parts of the intermediate potential of the energy storage unit 20 are exactly equal and the leakage current is 0; when the battery of the energy storage unit 20 has insulation failure, the voltages of the upper and lower parts of the intermediate potential of the energy storage unit 20 are unbalanced and a leakage current is generated. Therefore, the detection device 30 can detect whether the absolute value of the current value is greater than 0; if so, it means that the battery of the energy storage unit 20 has insulation failure; otherwise, it means that the battery of the energy storage unit 20 has no insulation failure.

[0104] Alternatively, the current value of the intermediate potential can be obtained first under the condition that it is determined that the energy storage unit 20 has no insulation failure, and this current value can be determined as the target value. When it is necessary to detect whether the energy storage unit 20 has insulation failure, the current value obtained from the intermediate potential is compared with the target value. If the current value is greater than the target value, it can be determined that the insulation failure detection result is that the battery core of the energy storage unit 20 has insulation failure; otherwise, it can be determined that the insulation failure detection result is that the battery core of the energy storage unit 20 has no insulation failure.

[0105] Alternatively, it can be detected whether the duration for which the current value is greater than the target value reaches a preset duration. If so, it can be determined that there is insulation failure of the battery core in the battery cluster. The preset duration can be set according to the actual situation.

[0106] Meanwhile, after detecting whether the absolute value of the current value exceeds the target value, it is also possible to determine which part the battery with insulation failure appears in according to the direction of the current value. If the current value is positive, it can be determined that the battery with insulation failure is located in the part below the intermediate potential. In addition, the severity of the insulation failure can also be determined according to the magnitude of the detected current value. Among them, the severity of the insulation failure is proportional to the magnitude of the current value.

[0107] By comparing the current value of the current flowing through the intermediate potential of the clamping circuit and the energy storage unit with a target value, an insulation failure detection result of the energy storage unit is obtained, so that when the energy storage unit is operating normally, the current can be directly detected by a detection device to determine whether there is an insulation failure of the battery in the energy storage unit, without switching the switch, thus having no impact on the clamping circuit, and further improving the detection efficiency of the insulation detection of the battery.

[0108] To further improve the insulation detection efficiency, in some embodiments, comparing the obtained current value with a target value to obtain an insulation failure detection result of the energy storage unit includes:

[0109] Comparing the current value of the intermediate potential point of any energy storage branch in the energy storage unit with the target value corresponding to the energy storage branch to obtain an insulation failure detection result of the energy storage unit.

[0110] In some embodiments, considering that the energy storage unit includes at least one energy storage branch, as Figure 5 shown, the energy storage unit 20 includes multiple parallel energy storage branches 200. Since the detection device is connected to the intermediate potential of the energy storage branch, if there is no insulation failure of the battery cell in this energy storage branch, the voltage difference detected by the detection device is basically zero, that is, the current detected by the detection device at this time is also zero. Therefore, the target value corresponding to this energy storage branch can be set to zero. Or, the detection device can first obtain the absolute value of the current value of the intermediate potential when it is determined that there is no insulation failure in the energy storage branch, and determine this current value as the target value corresponding to this energy storage branch. When it is necessary to detect whether there is an insulation failure in the energy storage unit, compare the absolute value of the current value obtained from the intermediate potential of this energy storage branch with the target value. If the absolute value of the current value is greater than the target value, it can be determined that the insulation failure detection result is that the battery cell of this energy storage branch in the energy storage unit has an insulation failure; otherwise, it can be determined that the insulation failure detection result is that the battery cell of this energy storage branch in the energy storage unit has no insulation failure. In this way, when there are multiple energy storage branches in the energy storage unit, the energy storage branch with insulation failure can be quickly located, improving the insulation detection efficiency.

[0111] And considering that in practical applications, the voltage of the center potential may only be close to zero but not zero. Therefore, to improve the accuracy of the insulation failure detection result, in some embodiments, the method further includes:

[0112] In response to the received prompt signal, obtaining a target value from the intermediate potential of the energy storage branch; wherein, the prompt signal is used to prompt the insulation failure of the battery cell adjacent to the intermediate potential of the energy storage branch.

[0113] In some embodiments, when only one of the battery cells adjacent to the intermediate potential of the energy storage branch has insulation failure, the user can send a prompt signal to the processor to indicate the insulation failure of the battery cell adjacent to the intermediate potential. For example, the user can send a prompt signal to the processor through a user terminal connected to the processor, or send a prompt signal to the processor by turning on the signal switch of the detection device. When the processor receives this prompt signal, it indicates that one of the battery cells adjacent to the intermediate potential in the energy storage branch has insulation failure. At this time, at the moment of receiving the prompt signal, the processor responds to the prompt signal and detects the current value at the intermediate point of the energy storage branch to use the detected current value as the target value. Considering that the insulation failure of a single battery does not cause a short circuit, that is, when a single battery has insulation failure, the current at the intermediate potential may not change. Therefore, the prompt signal can be used to prompt that both battery cells adjacent to the intermediate potential have insulation failure. That is, when only both battery cells adjacent to the intermediate potential in the energy storage branch have insulation failure, the user can send a prompt signal to the processor to indicate the insulation failure of the battery cells adjacent to the intermediate potential of the energy storage branch 200. Since the battery cells with insulation failure at this time are the battery cells adjacent to the intermediate potential, the leakage current generated under insulation failure is the minimum current that the battery in the energy storage branch can generate under insulation failure. That is, when multiple batteries in the energy storage branch have insulation failure, the current value at the intermediate potential is not less than the preset value.

[0114] And since the target battery is the battery adjacent to the intermediate potential of the energy storage branch, the leakage current generated under its insulation failure is the minimum current that the energy storage branch can generate under insulation failure. That is, when the battery in the energy storage branch has insulation failure, the current value at the intermediate potential is not less than the target value corresponding to the energy storage branch. After determining the target value, the detection device can detect whether the absolute value of the current value obtained from the intermediate potential of the energy storage branch is greater than the target value corresponding to the energy storage branch; if so, it indicates that the battery in the energy storage branch has insulation failure; otherwise, it indicates that the battery in the energy storage branch has no insulation failure. In this way, misjudgment of insulation failure detection can be reduced, and the accuracy of insulation failure detection results can be improved.

[0115] Figure 10 shows a schematic structural block diagram of an insulation failure detection device for an insulation detection circuit provided by an embodiment of the present application. It should be understood that this device is the same as Figure 9The method embodiment executed in the embodiment corresponds to the embodiment of the method, and can execute the steps involved in the aforementioned method. The specific functions of the device can be found in the description above. To avoid repetition, the detailed description is appropriately omitted here. The device includes at least one software function module that can be stored in a memory in the form of software or firmware or solidified in the operating system (OS) of the device. Specifically, the device can be applied to the insulation detection circuit in any of the above embodiments, and specifically, it can be applied to the detection equipment of the insulation detection circuit. The device includes: a detection module 301, which is used to compare the acquired current current value with the target value to obtain the insulation failure detection result of the energy storage unit.

[0116] In the technical solution of the embodiment of the present application, the insulation failure detection result of the energy storage unit is obtained by comparing the current current value flowing through the clamping circuit and the intermediate potential of the energy storage unit with the set target value. When the energy storage unit is operating normally, current detection can be directly performed through the detection equipment to determine whether the insulation failure of the battery in the energy storage unit occurs, without the need for switching, thereby not affecting the clamping circuit, and thus improving the detection efficiency of the battery insulation detection.

[0117] According to some embodiments of the present application, the insulation failure detection module 301 is specifically used to compare the current value of the intermediate potential point of any energy storage branch in the energy storage unit with the target value corresponding to the energy storage branch to obtain the insulation failure detection result of the energy storage branch.

[0118] According to some embodiments of the present application, the insulation failure detection module 301 is further used to: obtain a target value from the intermediate potential of the energy storage branch in response to a received prompt signal; wherein the prompt signal is used to prompt the insulation failure of the battery cell adjacent to the intermediate potential of the energy storage branch.

[0119] According to some embodiments of the present application, Figure 11 As shown, an embodiment of the present application provides an electronic device 400, including: a processor 401 and a memory 402, the processor 401 and the memory 402 are interconnected and communicate with each other through a communication bus 403 and / or other forms of connection mechanisms (not marked), and the memory 402 stores a computer program executable by the processor 401. When the computing device is running, the processor 401 executes the computer program to execute the method executed by the external terminal in any optional implementation method, for example: comparing the obtained current current value with the target value to obtain the insulation failure detection result of the energy storage unit.

[0120] The present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method in any of the aforementioned optional implementations is executed.

[0121] Among them, the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disc.

[0122] The present application provides a computer program product which, when running on a computer, causes the computer to execute the method in any of the optional implementation manners.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An insulation detection circuit, characterized in that, It includes a clamping circuit, an energy storage unit, and a detection device. The energy storage unit includes a plurality of interconnected batteries; The first end of the clamping circuit is connected to the positive electrode of the energy storage unit, the second end of the clamping circuit is connected to the negative electrode of the energy storage unit, and the first end and the second end of the clamping circuit are connected to a power supply; The intermediate potential of the energy storage unit is connected to the intermediate potential of the clamping circuit and the detection device, and the intermediate potential of the clamping circuit is grounded.

2. The insulation detection circuit according to claim 1, wherein The clamping circuit includes a first resistor unit and a second resistor unit; The first end of the first resistor unit is connected to the positive electrode of the energy storage unit, and the second end of the first resistor unit is connected to the first end of the second resistor unit; The first end of the second resistor unit is connected to the detection device, and the second end of the second resistor unit is connected to the negative electrode of the energy storage unit; The resistance values of the first resistor unit and the second resistor unit are the same.

3. The insulation detection circuit according to claim 2, wherein, The resistance value between the intermediate potential of the energy storage unit and the detection device is less than that of the first resistor unit or the second resistor unit.

4. The insulation detection circuit according to claim 1 or 2, characterized in that, The energy storage unit includes a plurality of parallel energy storage branches; Each energy storage branch includes a plurality of batteries, and the batteries in each energy storage branch are connected in series with each other.

5. The insulation detection circuit according to claim 4, wherein The intermediate potential of each energy storage branch is connected to the intermediate potential of the clamping circuit and the detection device.

6. The insulation detection circuit according to any one of claims 1-5, characterized in that, The insulation detection circuit further includes a first switch unit and a second switch unit; The first switch unit is disposed between the first end of the clamping circuit and the positive electrode of the energy storage unit, and the second switch unit is disposed between the second end of the clamping circuit and the negative electrode of the energy storage unit.

7. The insulation detection circuit according to any one of claims 1-6, characterized in that, The detection device includes a processor; The processor is configured to compare the acquired current value with a target value to obtain an insulation failure detection result of the energy storage unit.

8. The insulation detection circuit according to claim 7, wherein Specifically, the processor is configured to: Compare the current value of the intermediate potential point of any one of the energy storage branches in the energy storage unit with the corresponding target value of the energy storage branch to obtain an insulation failure detection result of the energy storage branch.

9. The insulation detection circuit according to claim 8, wherein The processor is further configured to: In response to the received prompt signal, obtain the target value from the intermediate potential of the energy storage branch; wherein the prompt signal is used to prompt that the battery core adjacent to the intermediate potential of the energy storage branch has insulation failure.

10. A method for detecting insulation failure of an insulation detection circuit, characterized in that, For a detection device applied to the insulation detection circuit according to any one of claims 7-8, the method includes: Compare the acquired current value with a target value to obtain an insulation failure detection result of the energy storage unit.

11. The insulation failure detection method of the insulation detection circuit according to claim 10, characterized in that, Comparing the acquired current value with a target value to obtain an insulation failure detection result of the energy storage unit includes: Compare the current value of the intermediate potential point of any one of the energy storage branches in the energy storage unit with the corresponding target value of the energy storage branch to obtain an insulation failure detection result of the energy storage unit.

12. The method for detecting insulation failure of the insulation detection circuit according to claim 11, wherein The method further includes: In response to the received prompt signal, obtain the target value from the intermediate potential of the energy storage branch; wherein the prompt signal is used to prompt that the battery core adjacent to the intermediate potential of the energy storage branch has insulation failure.

13. An electronic device, comprising a processor and a memory storing a computer program, characterized in that, When the processor executes the computer program, the insulation failure detection method of the insulation detection circuit according to any one of claims 10-12 is implemented.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the insulation failure detection method of the insulation detection circuit according to any one of claims ۱۰-۱۲ is implemented.

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