Insulation resistance detection circuit, method and electronic device in battery cluster

Abstract

The present invention discloses a detection circuit, method and electronic device for insulation resistance in a battery cluster. The circuit includes: a voltage divider circuit, wherein the first end of the voltage divider circuit is connected to the positive electrode of the battery cluster to be tested for insulation resistance, and the second end is connected to the negative electrode of the battery cluster; an isolation circuit, wherein the first end of the isolation circuit is connected to the positive electrode of the target battery cell in the battery cluster, the second end is connected to the third end of the voltage divider circuit, and the third end is grounded, wherein the battery cluster includes multiple battery cells, and the target battery cell is used to represent the battery cell to be tested for insulation resistance in the battery cluster; a controller, wherein the controller is connected to the voltage divider circuit and the isolation circuit, and is used to control the on-off state of the voltage divider circuit and the isolation circuit to determine the insulation resistance value of the positive electrode of the target battery cell. The present invention solves the technical problem of low efficiency in detecting insulation resistance in a battery cluster in the related art.

Description

Technical Field

[0001] The present invention relates to the field of battery cluster insulation detection, and in particular to a detection circuit, method and electronic equipment for insulation resistance in a battery cluster. Background Art

[0002] Multiple battery cells can form a battery cluster. The total positive or negative insulation resistance value of the battery cluster to ground is a key indicator for measuring the insulation safety and stability of the battery cluster. Therefore, it is very important to perform insulation testing on the battery cluster.

[0003] At present, in the related technologies, the insulation resistance detection of the battery cluster is mainly aimed at the insulation resistance between the total positive or total negative and the ground or the equivalent parallel value of multiple nodes. In addition, when detecting the insulation resistance of the battery cells in the battery cluster, there are problems such as misdetection or long detection time, resulting in low efficiency in the insulation resistance detection of the battery cluster in the related technologies.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a circuit, method and electronic device for detecting insulation resistance in a battery cluster, so as to at least solve the technical problem of low efficiency in detecting insulation resistance in a battery cluster in the related art.

[0006] According to one aspect of an embodiment of the present invention, a detection circuit for insulation resistance in a battery cluster is provided, comprising: a voltage divider circuit, wherein a first end of the voltage divider circuit is connected to a battery cluster positive electrode of a battery cluster to be subjected to insulation resistance detection, and a second end of the voltage divider circuit is connected to a battery cluster negative electrode of the battery cluster; an isolation circuit, wherein a first end of the isolation circuit is connected to a positive electrode of a target battery cell in the battery cluster, a second end of the isolation circuit is connected to a third end of the voltage divider circuit, and the third end of the isolation circuit is grounded, wherein the battery cluster comprises a plurality of battery cells, and the target battery cell is used to represent a battery cell in the battery cluster to be subjected to insulation resistance detection; and a controller, connected to the voltage divider circuit and the isolation circuit, and used to control the on / off state of the voltage divider circuit and the isolation circuit, so as to determine the insulation resistance value of the positive electrode of the target battery cell.

[0007] Optionally, the isolation circuit includes: an isolation resistor, a first end of the isolation resistor is connected to a first end of the isolation circuit, and a second end of the isolation resistor is connected to a third end of the isolation circuit; a first switch, a first end of the first switch is connected to a second end of the isolation circuit, and a second end of the first switch is connected to a third end of the isolation circuit; and a controller, connected to the first switch, for controlling the open and closed state of the first switch to control the on and off state of the isolation circuit.

[0008] Optionally, the voltage divider circuit includes: a first voltage divider circuit, a first end of the first voltage divider circuit is connected to the first end of the voltage divider circuit; a second voltage divider circuit, a first end of the second voltage divider circuit is connected to the second end of the voltage divider circuit, and the second end of the second voltage divider circuit is connected to the second end of the first voltage divider circuit; a controller, connected to the first voltage divider circuit and the second voltage divider circuit, and used to control the on and off states of the first voltage divider circuit and the second voltage divider circuit.

[0009] Optionally, the first voltage divider circuit includes: a first resistor, a first end of the first resistor is connected to the first end of the first voltage divider circuit; a second switch, a first end of the second switch is connected to the second end of the first resistor; a second resistor, a first end of the second resistor is connected to the second end of the second switch, and the second end of the second resistor is connected to the second end of the first voltage divider circuit; a controller, connected to the second switch, for controlling the opening and closing state of the second switch to control the on-off state of the first voltage divider circuit.

[0010] Optionally, the second voltage-dividing circuit includes: a third resistor, a first end of the third resistor is connected to the first end of the second voltage-dividing circuit; a third switch, a first end of the third switch is connected to the second end of the third resistor; a fourth resistor, a first end of the fourth resistor is connected to the second end of the third switch, and a second end of the fourth resistor is connected to the second end of the second voltage-dividing circuit; and a controller, connected to the third switch, for controlling the opening and closing state of the third switch to control the on-off state of the second voltage-dividing circuit.

[0011] According to another aspect of an embodiment of the present invention, a method for detecting insulation resistance in a battery cluster is provided, comprising: controlling the on / off state of a voltage divider circuit and an isolation circuit by a controller so that the insulation resistance detection circuit is in different voltage divider states, and obtaining a plurality of voltages corresponding to different voltage divider states, wherein the voltage divider state is used to indicate the voltage divider state when the insulation resistance detection circuit is in different connectivity states and connected to the battery cluster; and determining the insulation resistance value of the positive electrode of a target battery cell in the battery cluster based on the plurality of voltages.

[0012] Optionally, the multiple voltages include a first voltage and a second voltage, and the on / off states of the voltage divider circuit and the isolation circuit are controlled by a controller so that the insulation resistance detection circuit is in different voltage divider states, and multiple voltages corresponding to different voltage divider states are obtained, including: controlling the first voltage divider circuit and the second voltage divider circuit in the voltage divider circuit to be in a connected state, and controlling the isolation circuit to be in a disconnected state, so that the insulation resistance detection circuit is in a first voltage divider state, and obtaining the first voltage and the second voltage, wherein the first voltage divider state is used to indicate that the first voltage divider circuit and the second voltage divider circuit are in a voltage divider state, the first voltage is used to indicate the potential difference flowing through the second resistor in the first voltage divider state, and the second voltage is used to indicate the potential difference flowing through the fourth resistor in the first voltage divider state.

[0013] Optionally, the multiple voltages include a third voltage, and the on / off states of the voltage divider circuit and the isolation circuit are controlled by a controller so that the insulation resistance detection circuit is in different voltage divider states, and multiple voltages corresponding to different voltage divider states are obtained, including: controlling the first voltage divider circuit and the isolation circuit to be in a connected state, controlling the second voltage divider circuit to be in an disconnected state, so that the insulation resistance detection circuit is in a second voltage divider state, and obtaining a third voltage, wherein the second voltage divider state is used to indicate that the first voltage divider circuit and the isolation circuit are in a voltage divider state, and the third voltage is used to indicate the voltage value at the positive electrode of the battery cluster in the second voltage divider state.

[0014] Optionally, the multiple voltages include a fourth voltage, and the on / off states of the voltage divider circuit and the isolation circuit are controlled by a controller so that the insulation resistance detection circuit is in different voltage divider states, and multiple voltages corresponding to different voltage divider states are obtained, including: controlling the second voltage divider circuit and the isolation circuit to be in a connected state, controlling the first voltage divider circuit to be in a disconnected state, so that the insulation resistance detection circuit is in a third voltage divider state, and obtaining a fourth voltage, wherein the third voltage divider state is used to indicate that the second voltage divider circuit and the isolation circuit are in a voltage divider state, and the fourth voltage is used to indicate the voltage value at the negative electrode of the battery cluster of the battery cluster in the third voltage divider state.

[0015] Optionally, the multiple voltages include a first voltage, a second voltage, a third voltage and a fourth voltage, and determining the insulation resistance value of the positive electrode of the target battery cell in the battery cluster based on the multiple voltages includes: determining the actual voltage of the battery cluster based on the first voltage, the second voltage, the first resistance, the second resistance, the third resistance and the fourth resistance; constructing a first voltage division relationship in a second voltage division state based on the actual voltage, the third voltage, the first resistance and the second resistance; constructing a second voltage division relationship in a third voltage division state based on the actual voltage, the fourth voltage, the third resistance and the fourth resistance; and determining the insulation resistance value based on the first voltage division relationship and the second voltage division relationship.

[0016] According to another aspect of an embodiment of the present invention, there is also provided an electronic device, comprising: a memory storing an executable program; and a processor for running the program, wherein the method for detecting insulation resistance in a battery cluster is executed when the program is running.

[0017] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium includes a stored executable program. When the executable program runs, the device where the storage medium is located is controlled to execute the above-mentioned method for detecting insulation resistance in a battery cluster.

[0018] According to another aspect of an embodiment of the present invention, a computer program product is further provided. When the computer program is executed by a processor, the computer program implements the above-mentioned method for detecting insulation resistance in a battery cluster.

[0019] In an embodiment of the present invention, a detection circuit for insulation resistance in a battery cluster includes: a voltage divider circuit, a first end of the voltage divider circuit is connected to a battery cluster positive electrode of a battery cluster to be subjected to insulation resistance detection, and a second end of the voltage divider circuit is connected to a battery cluster negative electrode of the battery cluster; an isolation circuit, a first end of the isolation circuit is connected to a positive electrode of a target battery cell in the battery cluster, a second end of the isolation circuit is connected to a third end of the voltage divider circuit, and the third end of the isolation circuit is grounded, wherein the battery cluster includes a plurality of battery cells, and the target battery cell is used to represent a battery cell in the battery cluster to be subjected to insulation resistance detection; and a controller, connected to the voltage divider circuit and the isolation circuit, and used to control the on / off state of the voltage divider circuit and the isolation circuit to determine the insulation resistance value of the positive electrode of the target battery cell. It is easy to notice that the insulation resistance detection circuit in the battery cluster sets a voltage divider circuit at both ends of the battery cluster and sets an isolation circuit between the target battery cell and the voltage divider circuit, and uses a controller to control the on-off state of the voltage divider circuit and the isolation circuit, so that the detection circuit is in different voltage division relationships, and then the insulation resistance value of the target battery cell in the battery cluster is determined based on the different voltage division relationships, so that the abnormal points of the insulation resistance of the battery cluster can be effectively identified, and then the insulation resistance of the target battery cell in the battery cluster can be accurately detected and quickly located, ensuring the insulation safety of the specific abnormal resistance, avoiding the occurrence of safety accidents of the energy storage system caused by insulation abnormalities, and thus solving the technical problem of low efficiency in detecting insulation resistance in battery clusters in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 is a schematic diagram of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of a first voltage division state of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a second voltage division state of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of a third voltage division state of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the present invention;

[0025] Figure 5 is a flow chart of a method for detecting insulation resistance in a battery cluster according to an embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of a device for detecting insulation resistance in a battery cluster according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] According to an embodiment of the present invention, a detection circuit for insulation resistance in a battery cluster is provided. Figure 1 A detection circuit for insulation resistance in a battery cluster according to the present application is provided. Figure 1 As shown, the detection circuit of the insulation resistance in the battery cluster includes:

[0030] A voltage divider circuit 102, wherein a first end of the voltage divider circuit is connected to a positive electrode of a battery cluster 104 to be tested for insulation resistance, and a second end of the voltage divider circuit is connected to a negative electrode of the battery cluster;

[0031] an isolation circuit 106, wherein a first end of the isolation circuit is connected to a positive electrode of a target battery cell 108 in the battery cluster, a second end of the isolation circuit is connected to a third end of the voltage divider circuit, and the third end of the isolation circuit is grounded, wherein the battery cluster includes a plurality of battery cells, and the target battery cell is used to indicate a battery cell in the battery cluster to be subjected to insulation resistance detection;

[0032] The controller is connected to the voltage divider circuit and the isolation circuit, and is used to control the on / off state of the voltage divider circuit and the isolation circuit to determine the insulation resistance value of the positive electrode of the target battery cell.

[0033] The battery cluster can be a larger battery pack composed of multiple battery cells in a certain series-parallel connection to meet specific energy and power requirements. The specific number, type and series-parallel connection of the battery cells are determined according to the required energy capacity and output voltage.

[0034] The above-mentioned target battery cell may refer to a battery cell in a battery cluster on which insulation resistance testing is to be performed, or may be a specific battery cell position. The specific position of the target battery cell in the battery cluster may be determined according to actual needs. In the present embodiment, the target battery cell is set according to the need for insulation resistance testing in the battery cluster, and is not limited here.

[0035] In an optional experimental example, multiple battery cells are connected together in series and parallel to form a battery cluster. In related applications, it is necessary to obtain the insulation resistance value of a certain battery cell, namely, the target battery cell. The total positive or negative insulation resistance value of the battery cluster to the ground is an important indicator for measuring the insulation safety of the battery cluster. This requires that the insulation resistance value of each battery cell including the target battery cell to the ground can be obtained and meet the safety standards. In this embodiment, the insulation resistance detection circuit in the battery cluster can be used to perform insulation detection on the target battery cell and accurately locate it, thereby obtaining the insulation resistance value of the target battery cell.

[0036] The above-mentioned voltage divider circuit may refer to a circuit structure that reduces the input voltage proportionally to obtain different output voltages. The voltage divider circuit may include a resistor voltage divider circuit, a capacitor voltage divider circuit, a transformer voltage divider circuit, and a digital voltage divider circuit, etc. The specific design depends on the required output voltage range, load requirements, and operating frequency of the circuit. The function of the voltage divider circuit may be to control the on and off state of the voltage divider circuit so that the voltage divider circuit is in different voltage divider states to determine the voltage divider relationship, so as to facilitate the determination of the insulation resistance based on the voltage divider relationship. It can also be used for voltage reduction, signal amplification, linearization processing, voltage stabilization, and protection circuits, etc.

[0037] The above-mentioned isolation circuit may refer to a circuit structure used to achieve electrical isolation between electrical systems or components, which can generate a corresponding output signal based on a specific input signal, thereby achieving the function of electrical isolation. The isolation circuit may include but is not limited to transformer isolation, optocoupler isolation, capacitor isolation, etc. The functions of the isolation circuit may include but are not limited to protecting equipment, protecting personnel safety, signal isolation, and improving system stability.

[0038] The above-mentioned controller may refer to a circuit structure for controlling the insulation resistance detection circuit in the battery cluster to perform battery insulation detection on the target battery cell. The controller may generate a corresponding output signal according to a specific input signal, thereby realizing control of the insulation detection circuit. The input signal may include but is not limited to current, temperature, voltage, etc. The controller may include but is not limited to a switching circuit, a logic circuit, a timing circuit, a comparator circuit, etc. The functions of the controller may include but are not limited to controlling the detection circuit, real-time monitoring of the battery cluster status, fault diagnosis and alarm, data recording and analysis, etc.

[0039] In an optional embodiment, Figure 2 1 is a schematic diagram of a first voltage division state of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the present invention. Here, the first voltage division state indicates that the first voltage division circuit and the second voltage division circuit are in a voltage division state. The first voltage division circuit includes a first resistor Rp, a second switch Sp, a second resistor Rps and a controller. The second voltage division circuit includes a third resistor Rn, a third switch Sn, a fourth resistor Rns and a controller. The isolation circuit includes an isolation resistor Riso, a first switch Sw and a controller. The isolation circuit is grounded. The voltage value of the insulation fault point is Ux. The test process starts. The second switch Sp and the third switch Sn are closed. The first switch Sw is opened. The circuit state is as follows: Figure 2 As shown, when the insulation resistance detection circuit in the battery cluster is in the first voltage division state, the resistance values ​​of the first resistor Rp, the second resistor Rps, the third resistor Rn, and the fourth resistor Rns in the insulation resistance detection circuit in the battery cluster are known, and the corresponding first voltage Vps and second voltage Vns are obtained through detection, so that the actual voltage Ub of the battery cluster can be calculated through the above data, that is,

[0040] Ub=Vps*(Rp+Rps) / Rps+Vns*(Rn+Rns) / Rns;

[0041] Thereby, the actual voltage value Ub of the battery cluster is obtained.

[0042] In an embodiment of the present invention, a detection circuit for insulation resistance in a battery cluster includes: a voltage divider circuit, wherein a first end of the voltage divider circuit is connected to a battery cluster positive electrode of a battery cluster to be subjected to insulation resistance detection, and a second end of the voltage divider circuit is connected to a battery cluster negative electrode of the battery cluster; an isolation circuit, wherein a first end of the isolation circuit is connected to a positive electrode of a target battery cell in the battery cluster, a second end of the isolation circuit is connected to a third end of the voltage divider circuit, and the third end of the isolation circuit is grounded, wherein the battery cluster includes a plurality of battery cells, and the target battery cell is used to represent a battery cell in the battery cluster to be subjected to insulation resistance detection; and a controller, connected to the voltage divider circuit and the isolation circuit, and used to control the on / off state of the voltage divider circuit and the isolation circuit to determine the insulation resistance value of the positive electrode of the target battery cell. It is easy to notice that the insulation resistance detection circuit in the battery cluster sets a voltage divider circuit at both ends of the battery cluster and sets an isolation circuit between the target battery cell and the voltage divider circuit, and uses a controller to control the on-off state of the voltage divider circuit and the isolation circuit, so that the detection circuit is in different voltage division relationships, and then the insulation resistance value of the target battery cell in the battery cluster is determined based on the different voltage division relationships, so that the abnormal points of the insulation resistance of the battery cluster can be effectively identified, and then the insulation resistance of the target battery cell in the battery cluster can be accurately detected and quickly located, ensuring the insulation safety of the specific abnormal resistance, avoiding the occurrence of safety accidents of the energy storage system caused by insulation abnormalities, and thus solving the technical problem of low efficiency in detecting insulation resistance in battery clusters in related technologies.

[0043] Optionally, the isolation circuit includes: an isolation resistor, a first end of the isolation resistor is connected to a first end of the isolation circuit, and a second end of the isolation resistor is connected to a third end of the isolation circuit; a first switch, a first end of the first switch is connected to a second end of the isolation circuit, and a second end of the first switch is connected to a third end of the isolation circuit; and a controller, connected to the first switch, for controlling the open and closed state of the first switch to control the on and off state of the isolation circuit.

[0044] The above-mentioned isolation resistor may refer to a component used to isolate the current flow between different parts of a circuit. The isolation resistor may play an isolation and protection role in the circuit to prevent current interference or short circuit between different parts. The isolation resistor element may be made of insulating material, which may effectively isolate different parts of the circuit and ensure the stability and safety of the circuit. The type and resistance value of the isolation resistor may be determined according to the operating voltage, current, power and other parameters of the circuit, and are not limited here.

[0045] In an optional embodiment, the electrical isolation between the first voltage-dividing circuit and the second voltage-dividing circuit can be maintained by an isolation circuit, thereby improving the safety, reliability and stability of the circuit system while realizing the detection of the isolation resistor value.

[0046] Optionally, the voltage divider circuit includes: a first voltage divider circuit, a first end of the first voltage divider circuit is connected to the first end of the voltage divider circuit; a second voltage divider circuit, a first end of the second voltage divider circuit is connected to the second end of the voltage divider circuit, and the second end of the second voltage divider circuit is connected to the second end of the first voltage divider circuit; a controller, connected to the first voltage divider circuit and the second voltage divider circuit, and used to control the on and off states of the first voltage divider circuit and the second voltage divider circuit.

[0047] The above-mentioned first voltage divider circuit and second voltage divider circuit may refer to voltage divider circuits with different resistance values ​​and voltage outputs, which may be used to generate reference voltages of different levels, or to amplify and adjust the amplitude of a signal. They may be used independently or in combination to achieve more complex voltage regulation or signal processing functions.

[0048] The controller can control the on / off state of the first voltage-dividing circuit and the second voltage-dividing circuit by controlling a switch in the voltage-dividing circuit or a circuit element such as a switch used to control the on / off state of the circuit.

[0049] In an optional embodiment, when the insulation resistance detection circuit in the battery cluster performs insulation detection on the target battery cell, the voltage divider circuit isolates the target battery cell from the actual total voltage of the battery cluster and provides a suitable voltage signal for use by the detection circuit.

[0050] Optionally, the first voltage divider circuit includes: a first resistor, a first end of the first resistor is connected to the first end of the first voltage divider circuit; a second switch, a first end of the second switch is connected to the second end of the first resistor; a second resistor, a first end of the second resistor is connected to the second end of the second switch, and the second end of the second resistor is connected to the second end of the first voltage divider circuit; a controller, connected to the second switch, for controlling the opening and closing state of the second switch to control the on-off state of the first voltage divider circuit.

[0051] The first voltage divider circuit mentioned above may refer to the first voltage divider part in a circuit system having a plurality of voltage divider cascades, and may be a circuit including a first resistor Rp, a second switch Sp, a second resistor Rps and a controller.

[0052] The types and resistance values ​​of the first resistor and the second resistor can be selected according to system requirements and are not limited here.

[0053] In an optional embodiment, Figure 31 is a schematic diagram of a second voltage division state of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the present invention. The second voltage division state indicates that the first voltage division circuit and the isolation circuit are in a voltage division state. The first voltage division circuit includes a first resistor Rp, a second switch Sp, a second resistor Rps and a controller. The isolation circuit includes an isolation resistor Riso, a first switch Sw and a controller. The isolation circuit is grounded. The second voltage division circuit includes a third resistor Rn, a third switch Sn, a fourth resistor Rns and a controller. The test process starts, the second switch Sp is closed, the third switch Sn is opened, and the first switch Sw is closed. The circuit state is as shown in FIG. Figure 3 As shown, when the detection circuit of the insulation resistance in the battery cluster is in the second voltage division state, the voltage value Up' close to the total positive of the battery cluster can be obtained by measurement, the isolation resistance Riso is the insulation resistance value to be sought, and the voltage value of the insulation fault point is expressed as Ux, so that the resistance values ​​of the first resistor Rp and the second resistor Rps, the voltage value Up' close to the total positive of the battery cluster and the actual voltage Ub of the battery cluster can be used to obtain equation 1, that is:

[0054] (Rp+Rps) / Riso=Up' / (Ub-Ux-Up');

[0055] Among them, Riso is the insulation resistance value, and Ux is the voltage value at the insulation fault point.

[0056] Optionally, the second voltage-dividing circuit includes: a third resistor, a first end of the third resistor is connected to the first end of the second voltage-dividing circuit; a third switch, a first end of the third switch is connected to the second end of the third resistor; a fourth resistor, a first end of the fourth resistor is connected to the second end of the third switch, and a second end of the fourth resistor is connected to the second end of the second voltage-dividing circuit; and a controller, connected to the third switch, for controlling the opening and closing state of the third switch to control the on-off state of the second voltage-dividing circuit.

[0057] The second voltage divider circuit mentioned above may refer to the second voltage divider part in a circuit system having multiple voltage divider cascades, and may be a circuit including a third resistor Rn, a third switch Sn, a fourth resistor Rns and a controller in the voltage divider circuit.

[0058] The types and resistance values ​​of the third resistor and the fourth resistor can be selected according to system requirements and are not limited here.

[0059] In an optional embodiment, Figure 41 is a schematic diagram of a third voltage-dividing state of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the present invention. The third voltage-dividing state is used to indicate that the second voltage-dividing circuit and the isolation circuit are in a voltage-dividing state. The second voltage-dividing circuit includes a third resistor Rn, a third switch Sn, a fourth resistor Rns and a controller. The isolation circuit includes an isolation resistor Riso, a first switch Sw and a controller. The isolation circuit is grounded. The first voltage-dividing circuit includes a first resistor Rp, a second switch Sp, a second resistor Rps and a controller. The test process starts, the second switch Sp is opened, the third switch Sn is closed, and the first switch Sw is closed. The circuit state is as follows: Figure 4 As shown, when the detection circuit of the insulation resistance in the battery cluster is in the third voltage division state, the circuit is composed of a battery pack, an isolation resistor, a first switch, a third resistor, a fourth switch, and a controller, wherein the voltage value Un' close to the total negative of the battery cluster, the isolation resistor Riso is the insulation resistance value to be sought, and the corresponding insulation fault point voltage value Ux, so that the equation 2 containing the unknown insulation resistance value Riso and the insulation fault point voltage value Ux can be obtained through the resistance value of the third resistor Rn and the fourth resistor Rns and the voltage value Un' close to the total negative of the battery cluster, (Rn+Rns) / Riso=Un' / (Ux-Un'); the insulation resistance value Riso and the insulation fault point voltage value Ux can be obtained by combining equations 1 and 2, that is:

[0060] Riso={(Rp+Rps)*Up*Un+(Rp+Rps)*Up²-(Rp+Rps)*Up*Ub-

[0061] [(Up*Ub-Up*Un-Up²)²-4*Up*Un]^(1 / 2)} / -4*Up*Un;

[0062] Ux=Un'*Ub / (Up'+Un');

[0063] The insulation resistance value Riso of the target battery unit and the insulation fault point voltage value Ux are obtained, and then the specific insulation abnormality cell point can be located according to Ux and the total number of battery strings in the system.

[0064] According to another aspect of an embodiment of the present invention, a method for detecting insulation resistance in a battery cluster is also provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than that shown here.

[0065] Figure 5 is a flow chart of a method for detecting insulation resistance in a battery cluster according to an embodiment of the present invention. Figure 5As shown, the method comprises the following steps:

[0066] Step S502: Control the on / off states of the voltage-dividing circuit and the isolation circuit through the controller, so that the insulation resistance detection circuit is in different voltage-dividing states, and obtain multiple voltages corresponding to the different voltage-dividing states.

[0067] The above-mentioned multiple voltages may refer to the voltages across the corresponding electrical components when the detection circuit is in different voltage division states, which may be resistor voltage, capacitor voltage, memory voltage, etc., determined according to specific needs and not limited here.

[0068] In an optional embodiment, a method for detecting insulation resistance in a battery cluster proposed in the present application controls the on-off state of the detection circuit system through a controller. There are three circuit on-off states, including a first voltage division state, a second voltage division state and a third voltage division state. In the first voltage division state, the first voltage division circuit and the second voltage division circuit are in a voltage division state. The test process starts, the second switch Sp and the third switch Sn are closed, and the first switch Sw is opened. At this time, the circuit consists of a battery pack, a first resistor, a second switch, a second resistor, a third resistor, a third switch, a fourth resistor and a controller. In the first voltage division state, the resistance values ​​of the first resistor Rp, the second resistor Rps, the third resistor Rn and the fourth resistor Rns in the insulation resistance detection circuit of the battery cluster are known, and the corresponding first voltage Vps and second voltage Vns are obtained through detection, so that the actual voltage Ub of the battery cluster can be calculated through the above data, that is, Ub=Vps*(Rp+Rps) / Rps+Vns*(Rn+Rns) / Rns, thereby obtaining the actual voltage value Ub of the battery cluster.

[0069] In an optional embodiment, in the second voltage division state, the first voltage division circuit and the isolation circuit are in the voltage division state, the test process starts, the second switch Sp is closed, the third switch Sn is opened, and the first switch Sw is closed. At this time, the circuit consists of a battery pack, a first resistor, a second switch, a second resistor, an isolation resistor, a first switch and a controller, wherein the voltage value Up' close to the total positive of the battery cluster can be obtained by measurement, the isolation resistor Riso is the required insulation resistance value, and the insulation fault point voltage value is expressed as Ux, so that the equation 1 containing the unknown insulation resistance value Riso and the insulation fault point voltage value Ux can be obtained through the resistance values ​​of the first resistor Rp and the second resistor Rps, the voltage value Up' close to the total positive of the battery cluster and the actual voltage Ub of the battery cluster, (Rp+Rps) / Riso=Up' / (Ub-Ux-Up'). In the third voltage division state, the second voltage division circuit and the isolation circuit are in the voltage division state, and the test process starts, the second switch Sp is opened, the third switch Sn is closed, and the first switch Sw is closed. At this time, the circuit is composed of a battery pack, an isolation resistor, a first switch, a third resistor, a fourth resistor and a controller, wherein the voltage value Un' close to the total negative of the battery cluster, the isolation resistor Riso is the required insulation resistance value, and the corresponding insulation fault point voltage value Ux, so that the resistance value of the third resistor Rn and the fourth resistor Rns and the voltage value Un' close to the total negative of the battery cluster can be obtained by equation 2 containing the unknown insulation resistance value Riso and the insulation fault point voltage value Ux, (Rn+Rns) / Riso=Un' / (Ux-Un'), and the insulation fault point voltage value Ux can be obtained by combining equation 1 with equation 2, that is:

[0070] Ux=Un'*Ub / (Up'+Un');

[0071] Thus, the voltage value Ux at the insulation fault point and the corresponding multiple voltages under different voltage division states can be obtained.

[0072] Step S504 : determining the insulation resistance value of the positive electrode of the target battery cell in the battery cluster based on the multiple voltages.

[0073] In an optional embodiment, the insulation resistance value Riso can be obtained by combining equation 1 (Rp+Rps) / Riso=Up' / (Ub-Ux-Up') and equation 2 (Rn+Rns) / Riso=Un' / (Ux-Un'), that is:

[0074] Riso={(Rp+Rps)*Up*Un+(Rp+Rps)*Up²-(Rp+Rps)*Up*Ub-

[0075] [(Up*Ub-Up*Un-Up²)²-4*Up*Un]^(1 / 2)} / -4*Up*Un;

[0076] Thus, the positive electrode insulation resistance value Riso of the target battery unit is obtained, and then the specific insulation abnormal cell point can be located according to the insulation fault point voltage value Ux obtained in the previous step and the total number of battery strings in the system.

[0077] Optionally, the multiple voltages include a first voltage and a second voltage, and the on / off states of the voltage divider circuit and the isolation circuit are controlled by a controller so that the insulation resistance detection circuit is in different voltage divider states, and multiple voltages corresponding to different voltage divider states are obtained, including: controlling the first voltage divider circuit and the second voltage divider circuit in the voltage divider circuit to be in a connected state, and controlling the isolation circuit to be in a disconnected state, so that the insulation resistance detection circuit is in a first voltage divider state, and obtaining the first voltage and the second voltage, wherein the first voltage divider state is used to indicate that the first voltage divider circuit and the second voltage divider circuit are in a voltage divider state, the first voltage is used to indicate the potential difference flowing through the second resistor in the first voltage divider state, and the second voltage is used to indicate the potential difference flowing through the fourth resistor in the first voltage divider state.

[0078] The first voltage mentioned above may be a potential difference flowing through the second resistor Rps in the first voltage division state, and the second voltage may be a potential difference flowing through the fourth resistor Rns in the first voltage division state.

[0079] In an optional embodiment, at the beginning of the test process, the second switch Sp and the third switch Sn are closed first, and the first switch Sw is opened, so that the detection circuit is in a first voltage division state. At this time, the resistance values ​​of the first resistor Rp, the second resistor Rps, the third resistor Rn, and the fourth resistor Rns are known, and the corresponding first voltage Vps and second voltage Vns are obtained through detection, so that the actual voltage Ub of the battery cluster can be calculated through the above data, that is, Ub=Vps*(Rp+Rps) / Rps+Vns*(Rn+Rns) / Rns, thereby obtaining the actual voltage value Ub of the battery cluster.

[0080] Optionally, the multiple voltages include a third voltage, and the on / off states of the voltage divider circuit and the isolation circuit are controlled by a controller so that the insulation resistance detection circuit is in different voltage divider states, and multiple voltages corresponding to different voltage divider states are obtained, including: controlling the first voltage divider circuit and the isolation circuit to be in a connected state, controlling the second voltage divider circuit to be in an disconnected state, so that the insulation resistance detection circuit is in a second voltage divider state, and obtaining a third voltage, wherein the second voltage divider state is used to indicate that the first voltage divider circuit and the isolation circuit are in a voltage divider state, and the third voltage is used to indicate the voltage value at the positive electrode of the battery cluster in the second voltage divider state.

[0081] In an optional embodiment, the test process starts, the second switch Sp is closed, the third switch Sn is opened, and the first switch Sw is closed, so that the detection circuit is in a second voltage division state, wherein the voltage value Up' close to the total positive of the battery cluster can be obtained by measurement, the isolation resistance Riso is the required insulation resistance value, and the insulation fault point voltage value is represented by Ux, so that the first voltage division relationship including the unknown insulation resistance value Riso and the insulation fault point voltage value Ux can be obtained by the resistance values ​​of the first resistor Rp and the second resistor Rps, the voltage value Up' close to the total positive of the battery cluster and the actual voltage Ub of the battery cluster, (Rp+Rps) / Riso=Up' / (Ub-Ux-Up').

[0082] Optionally, the multiple voltages include a fourth voltage, and the on / off states of the voltage divider circuit and the isolation circuit are controlled by a controller so that the insulation resistance detection circuit is in different voltage divider states, and multiple voltages corresponding to different voltage divider states are obtained, including: controlling the second voltage divider circuit and the isolation circuit to be in a connected state, controlling the first voltage divider circuit to be in a disconnected state, so that the insulation resistance detection circuit is in a third voltage divider state, and obtaining a fourth voltage, wherein the third voltage divider state is used to indicate that the second voltage divider circuit and the isolation circuit are in a voltage divider state, and the fourth voltage is used to indicate the voltage value at the negative electrode of the battery cluster of the battery cluster in the third voltage divider state.

[0083] In an optional embodiment, the test process starts, the second switch Sp is opened, the third switch Sn is closed, and the first switch Sw is closed, so that the detection circuit is in a second voltage division state, wherein the voltage value Un' close to the total negative of the battery cluster, the isolation resistor Riso is the required insulation resistance value, and the corresponding insulation fault point voltage value Ux, so that the second voltage division relationship including the unknown insulation resistance value Riso and the insulation fault point voltage value Ux can be obtained through the resistance value of the third resistor Rn and the fourth resistor Rns and the voltage value Un' close to the total negative of the battery cluster, (Rn+Rns) / Riso=Un' / (Ux-Un').

[0084] Optionally, the multiple voltages include a first voltage, a second voltage, a third voltage and a fourth voltage, and determining the insulation resistance value of the positive electrode of the target battery cell in the battery cluster based on the multiple voltages includes: determining the actual voltage of the battery cluster based on the first voltage, the second voltage, the first resistance, the second resistance, the third resistance and the fourth resistance; constructing a first voltage division relationship in a second voltage division state based on the actual voltage, the third voltage, the first resistance and the second resistance; constructing a second voltage division relationship in a third voltage division state based on the actual voltage, the fourth voltage, the third resistance and the fourth resistance; and determining the insulation resistance value based on the first voltage division relationship and the second voltage division relationship.

[0085] In an optional embodiment, after the test is completed, the actual voltage value Ub of the battery cluster, as well as the first voltage division relationship and the second voltage division relationship can be obtained through the above steps. The above two voltage division relationships are combined to obtain the insulation resistance value Riso and the insulation fault point voltage value Ux.

[0086] According to another aspect of an embodiment of the present invention, a device for detecting insulation resistance in a battery cluster is provided. The device can execute the method for detecting insulation resistance in a battery cluster of the above embodiment. The specific implementation method and preferred application scenario are the same as those of the above embodiment and will not be described in detail herein.

[0087] Figure 6 is a schematic diagram of a device for detecting insulation resistance in a battery cluster according to an embodiment of the present application, such as Figure 6 As shown, the device includes the following: a control module 602 , an acquisition module 604 , and a determination module 606 .

[0088] Among them, the control module 602 is used to control the on-off state of the voltage divider circuit and the isolation circuit through the controller so that the insulation resistance detection circuit is in different voltage divider states; the acquisition module 604 is used to obtain multiple voltages corresponding to different voltage divider states, wherein the voltage divider state is used to indicate that the insulation resistance detection circuit is in different connected states and the voltage divider state when connected to the battery cluster; the determination module 606 is used to determine the insulation resistance value of the positive electrode of the target battery cell in the battery cluster based on the multiple voltages.

[0089] In the above embodiments of the present application, the control module includes a first control unit, a second control unit, and a third control unit.

[0090] Among them, the first control unit is used to control the first voltage-dividing circuit and the second voltage-dividing circuit in the voltage-dividing circuit to be in a connected state, and control the isolation circuit to be in a disconnected state, so that the insulation resistance detection circuit is in the first voltage-dividing state; the second control unit is used to control the first voltage-dividing circuit and the isolation circuit to be in a connected state, and control the second voltage-dividing circuit to be in a disconnected state, so that the insulation resistance detection circuit is in the second voltage-dividing state; the third control unit is used to control the second voltage-dividing circuit and the isolation circuit to be in a connected state, and control the first voltage-dividing circuit to be in a disconnected state, so that the insulation resistance detection circuit is in a third voltage-dividing state.

[0091] In the above embodiments of the present application, the acquisition module includes a first acquisition unit, a second acquisition unit, and a third acquisition unit.

[0092] Among them, the first acquisition unit is used to obtain the first voltage and the second voltage when the detection circuit of the insulation resistance controlled by the above-mentioned first control unit is in the first voltage division state; the second acquisition unit is used to obtain the third voltage when the detection circuit of the insulation resistance controlled by the above-mentioned second control unit is in the second voltage division state; the third acquisition unit is used to obtain the third voltage when the detection circuit of the insulation resistance controlled by the above-mentioned third control unit is in the second voltage division state.

[0093] According to another aspect of an embodiment of the present invention, there is also provided an electronic device, comprising: a memory storing an executable program; and a processor for running the program, wherein the method for detecting insulation resistance in a battery cluster is executed when the program is running.

[0094] The memory in the above steps can be one of the memories such as random access memory RAM, read-only memory ROM and non-volatile memory, which is used to store programs and data in electronic devices. It is a temporary or permanent storage space that enables the processor to access and execute the information stored therein; the processor is the core component of the electronic device that executes program instructions, and is responsible for executing programs and data stored in the memory and processing various computing tasks. The types of memory and processor are not limited here.

[0095] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium includes a stored executable program. When the executable program runs, the device where the storage medium is located is controlled to execute the above-mentioned method for detecting insulation resistance in a battery cluster.

[0096] The computer-readable storage medium in the above steps can be a physical device for storing data, including semiconductors, magnetic cores, magnetic drums, magnetic tapes, laser disks, etc. Different media have different storage densities, access speeds and cost-effectiveness. Computer-readable storage media can allow computer systems to read and access information stored therein, which can be temporary or permanent, depending on the method and purpose of storing data.

[0097] According to another aspect of an embodiment of the present invention, a computer program product is further provided. When the computer program is executed by a processor, the computer program implements the above-mentioned method for detecting insulation resistance in a battery cluster.

[0098] The computer program product in the above steps may refer to a software product consisting of a series of computer programs, codes and related documents. These programs and codes are written to achieve specific functions and requirements, and usually include application programs, operating systems, database management systems, etc. The core of the computer program product is the program, that is, a collection of codes that perform tasks according to specific rules and logic.

[0099] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0100] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0101] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0102] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software functional units.

[0103] If the units are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc., which can store program codes.

[0104] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A detection circuit for insulation resistance in a battery cluster, characterized in that: include: A voltage divider circuit, wherein a first end of the voltage divider circuit is connected to a positive electrode of a battery cluster to be tested for insulation resistance, and a second end of the voltage divider circuit is connected to a negative electrode of the battery cluster; an isolation circuit, wherein a first end of the isolation circuit is connected to a positive electrode of a target battery cell in the battery cluster, a second end of the isolation circuit is connected to a third end of the voltage divider circuit, and the third end of the isolation circuit is grounded, wherein the battery cluster includes a plurality of battery cells, and the target battery cell is used to indicate a battery cell in the battery cluster to be subjected to insulation resistance detection; a controller connected to the voltage-dividing circuit and the isolation circuit, and configured to control the on / off states of the voltage-dividing circuit and the isolation circuit, obtain a first voltage-dividing relationship expression and a second voltage-dividing relationship expression, and determine the insulation resistance value of the positive electrode of the target battery cell based on the first voltage-dividing relationship expression and the second voltage-dividing relationship expression; The voltage divider circuit includes: a first voltage divider circuit, wherein the first end of the first voltage divider circuit is connected to the first end of the voltage divider circuit; a second voltage divider circuit, wherein the first end of the second voltage divider circuit is connected to the second end of the voltage divider circuit, the second end of the second voltage divider circuit is connected to the second end of the first voltage divider circuit, and is connected to the third end of the voltage divider circuit; the controller is connected to the first voltage divider circuit and the second voltage divider circuit, and is used to control the on-off state of the first voltage divider circuit and the second voltage divider circuit; the first voltage divider circuit includes: a first resistor, wherein the first end of the first resistor is connected to the first end of the first voltage divider circuit; a second switch, wherein the first end of the second switch is connected to the second end of the first resistor; a second resistor, wherein the first end of the second resistor is connected to the The second end of the second switch is connected, and the second end of the second resistor is connected to the second end of the first voltage-dividing circuit; the controller is connected to the second switch and is used to control the on-off state of the second switch to control the on-off state of the first voltage-dividing circuit; the second voltage-dividing circuit includes: a third resistor, a first end of the third resistor is connected to the first end of the second voltage-dividing circuit; a third switch, a first end of the third switch is connected to the second end of the third resistor; a fourth resistor, a first end of the fourth resistor is connected to the second end of the third switch, and a second end of the fourth resistor is connected to the second end of the second voltage-dividing circuit; the controller is connected to the third switch and is used to control the on-off state of the third switch to control the on-off state of the second voltage-dividing circuit; The first voltage division relationship is expressed as (Rp+Rps) / Riso=Up' / (Ub-Ux-Up'), and the second voltage division relationship is expressed as (Rn+Rns) / Riso=Un' / (Ux-Un'), wherein Rp is the first resistor in the voltage division circuit, Rps is the second resistor in the voltage division circuit, Up' is the voltage value close to the total positive of the battery cluster, Ub is the actual voltage of the battery cluster, Rn is the third resistor in the voltage division circuit, Rns is the fourth resistor in the voltage division circuit, Un' is the voltage value close to the total negative of the battery cluster, Riso is the insulation resistance value, and Ux is the insulation fault point voltage value; the controller is also used to determine the insulation fault point voltage value Ux based on the first voltage division relationship and the second voltage division relationship, and determine the insulation abnormal cell point based on the insulation fault point voltage value Ux and the total number of strings of the battery cluster.

2. The detection circuit of insulation resistance in a battery cluster according to claim 1, characterized in that: The isolation circuit comprises: an isolation resistor, wherein a first end of the isolation resistor is connected to a first end of the isolation circuit, and a second end of the isolation resistor is connected to a third end of the isolation circuit; a first switch, wherein a first end of the first switch is connected to a second end of the isolation circuit, and a second end of the first switch is connected to a third end of the isolation circuit; The controller is connected to the first switch and is used to control the on / off state of the first switch to control the on / off state of the isolation circuit.

3. A method for detecting insulation resistance in a battery cluster, characterized in that: The method for detecting the insulation resistance in the battery cluster according to any one of claims 1 to 2 comprises: Controlling the on / off state of the voltage divider circuit and the isolation circuit by a controller, so that the insulation resistance detection circuit is in different voltage divider states, and obtaining a plurality of voltages corresponding to the different voltage divider states, wherein the voltage divider state is used to indicate the voltage divider state when the insulation resistance detection circuit is in different connected states and connected to the battery cluster; An insulation resistance value of a positive electrode of a target battery cell in the battery cluster is determined based on the plurality of voltages.

4. The method for detecting insulation resistance in a battery cluster according to claim 3, characterized in that: The multiple voltages include a first voltage and a second voltage, and the on-off state of the voltage divider circuit and the isolation circuit is controlled by a controller so that the insulation resistance detection circuit is in different voltage divider states, and the multiple voltages corresponding to the different voltage divider states are obtained, including: Control the first voltage-dividing circuit and the second voltage-dividing circuit in the voltage-dividing circuit to be in a connected state, and control the isolation circuit to be in a disconnected state, so that the detection circuit of the insulation resistance is in a first voltage-dividing state, and obtain the first voltage and the second voltage, wherein the first voltage-dividing state is used to indicate that the first voltage-dividing circuit and the second voltage-dividing circuit are in a voltage-dividing state, the first voltage is used to indicate the potential difference flowing through the second resistor in the first voltage-dividing state, and the second voltage is used to indicate the potential difference flowing through the fourth resistor in the first voltage-dividing state.

5. The method for detecting insulation resistance in a battery cluster according to claim 4, characterized in that: The multiple voltages include a third voltage, and the on / off state of the voltage divider circuit and the isolation circuit is controlled by the controller so that the insulation resistance detection circuit is in different voltage divider states, and the multiple voltages corresponding to the different voltage divider states are obtained, including: The first voltage-dividing circuit and the isolation circuit are controlled to be in a connected state, and the second voltage-dividing circuit is controlled to be in a disconnected state, so that the insulation resistance detection circuit is in a second voltage-dividing state, and the third voltage is obtained, wherein the second voltage-dividing state is used to indicate that the first voltage-dividing circuit and the isolation circuit are in a voltage-dividing state, and the third voltage is used to indicate the voltage value at the positive electrode of the battery cluster of the battery cluster in the second voltage-dividing state.

6. The method for detecting insulation resistance in a battery cluster according to claim 5, characterized in that: The multiple voltages include a fourth voltage, and the on / off state of the voltage divider circuit and the isolation circuit is controlled by the controller so that the insulation resistance detection circuit is in different voltage divider states, and the multiple voltages corresponding to the different voltage divider states are obtained, including: The second voltage-dividing circuit and the isolation circuit are controlled to be in a connected state, and the first voltage-dividing circuit is controlled to be in a disconnected state, so that the insulation resistance detection circuit is in a third voltage-dividing state, and the fourth voltage is obtained, wherein the third voltage-dividing state is used to indicate that the second voltage-dividing circuit and the isolation circuit are in a voltage-dividing state, and the fourth voltage is used to indicate the voltage value at the negative electrode of the battery cluster of the battery cluster in the third voltage-dividing state.

7. The method for detecting insulation resistance in a battery cluster according to claim 6, characterized in that: The plurality of voltages include a first voltage, a second voltage, a third voltage, and a fourth voltage, and determining the insulation resistance value of the positive electrode of the target battery cell in the battery cluster based on the plurality of voltages includes: determining an actual voltage of the battery cluster based on the first voltage, the second voltage, a first resistor, a second resistor, a third resistor, and a fourth resistor; constructing a first voltage division relationship in a second voltage division state based on the actual voltage, the third voltage, the first resistor, and the second resistor; constructing a second voltage division relationship in a third voltage division state based on the actual voltage, the fourth voltage, the third resistor and the fourth resistor; The insulation resistance value is determined based on the first voltage division relationship expression and the second voltage division relationship expression.

8. An electronic device, characterized in that: include: A memory storing an executable program; A processor is used to run the program, wherein the program, when running, executes the method for detecting insulation resistance in a battery cluster according to any one of claims 3 to 7.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored executable program, wherein when the executable program is executed, the device where the storage medium is located is controlled to execute the method for detecting insulation resistance in a battery cluster according to any one of claims 3 to 7.

10. A computer program product, characterized in that The invention comprises a computer program, which, when executed by a processor, implements the method for detecting insulation resistance in a battery cluster according to any one of claims 3 to 7.

Images