Insulating Property Detection Device, Method, Equipment and Storage Medium

Abstract

The present application discloses an insulation detection device and method, equipment and storage medium. The insulation detection device includes: an insulation detection circuit, the insulation detection circuit includes: N first resistor strings, a second resistor string, N second pole branches, N first switches and a second switch; the nth first resistor string is connected in series with the nth first switch and connected between the first second pole branch and the grounding point; the second resistor string is connected in series with the second switch and used to connect between the second pole of the first battery pack and the grounding point; the nth second pole branch is used to connect to the second pole of the nth battery pack and the second to N second pole branches are suspended; a controller is used to control the N first switches and the second switches to enter a preset switch state respectively within a sampling period, and collect a first voltage and a second voltage at a second sampling point; based on the first voltage and the second voltage collected within a sampling period, the insulation resistance of the N battery packs is determined.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an insulation detection device and method, equipment, and storage medium. Background Art

[0002] Battery insulation testing is to detect the insulation between the positive and negative poles of the battery and the ground. The insulation is usually reflected by the insulation resistance.

[0003] In the related art, an insulation circuit is used to detect the insulation resistance of the battery. By closing and opening the switch on the insulation circuit, the insulation of the positive pole of the battery to the ground and the insulation of the negative pole of the battery to the ground can be detected respectively.

[0004] However, the battery insulation detection in the related art usually takes a long time, which results in a prolonged battery power supply response time of the electrical device. Summary of the Invention

[0005] In view of the above problems, the present application provides an insulation detection device and method, equipment and storage medium, which can at least partially solve the problem of low insulation detection efficiency.

[0006] In a first aspect, an insulation detection device is provided, comprising: an insulation detection circuit. The insulation detection circuit and controller include: N first resistor strings, a second resistor string, N second pole branches, N first switches, and a second switch; wherein N is a positive integer greater than or equal to 2; the nth first resistor string is connected in series with the nth first switch to connect the first pole of the nth battery pack and the ground point; wherein n is a positive integer less than N; if the first pole is a positive pole, the second pole is a negative pole; if the first pole is a negative pole, the second pole is a positive pole; the second resistor string is connected in series with the second switch to connect between the first second pole branch and the ground point; wherein the nth second pole branch is connected to the second pole of the nth battery pack; the second to N second pole branches are left floating; the controller is used to control the N first switches and the second switches to enter a preset switch state within a sampling cycle, and collect a first voltage at a first sampling point in the N first resistor strings and a second voltage at a second sampling point in the second resistor string in the preset switch state; wherein the insulation resistance values of the N battery packs are determined based on the first voltage and the second voltage collected within a sampling cycle.

[0007] In the insulation detection device provided by the embodiment of the present disclosure, the second to N second pole branches are suspended in the air, so that no interference is generated between the insulation detection circuits of two adjacent battery packs. In this way, the insulation detection circuit collects the voltage at the first sampling point and the second sampling point to detect the insulation resistance of multiple battery packs at one time, thereby improving the efficiency of insulation detection.

[0008] Based on the above solution, the preset switch states include: a first switch state, in which the N first switches and the second switches are both closed; and a second switch state, in which the N first switches are closed and the second switches are open.

[0009] The first and second switch states allow the insulation detection circuit to detect the insulation resistance of the battery pack's first and second terminals to ground. Switching between the first and second switch states allows for simple and rapid insulation resistance detection.

[0010] Based on the above scheme, the controller is specifically used to collect the first voltage of the first sampling point in the N first resistor strings and collect the second voltage of the second sampling point in the second resistor string after entering the first switching state for a first time period; and is used to collect the first voltage of the first sampling point in the N first resistor strings after entering the second switching state for a second time period.

[0011] The first voltage and the second voltage are collected after the first switch and the second switch enter the first switch state for a first time period, that is, after the voltages at the first sampling point and the second sampling point are stabilized, and the first voltage and the second voltage are collected after the first switch and the second switch enter the second switch state for a second time period, that is, after the voltages at the first sampling point and the second sampling point are stabilized, thereby ensuring the accuracy of the sampled voltages used to calculate the insulation resistance value, thereby ensuring the accuracy of the insulation resistance value.

[0012] Based on the above scheme, the controller includes: a first control module, which is used to control the switching state of the first first switch and the second switch, and generate switch control instructions for controlling the second to N first switches; an mth second control module, which is used to receive the switch instruction and control the switching state of the mth first switch according to the control instruction, wherein m is a positive integer greater than or equal to 2 and less than or equal to N.

[0013] The controller includes multiple control modules, including a first control module that controls the first and second switches of the first battery pack and generates switch control instructions for the second through Nth first switches. A second control module receives the switch control instructions from the first control module and controls the switching states of the corresponding first switches, enabling flexible control of the battery packs connected by a single control module. Furthermore, the second control module controls the switching states of the corresponding switches based on the switch control instructions sent by the first control module, thereby enabling linked control of N battery packs for simultaneous insulation testing.

[0014] Based on the above solution, the first control module and the second control module are wirelessly connected. If the first control module and the second control module are wirelessly connected, the second control module can be easily adjusted according to the number of battery packs to be tested for insulation.

[0015] Based on the above solution, N second pole branches are connected to the same third switch.

[0016] N second-pole branches are connected by a common third switch. Since the connection of the second resistor string is omitted in the 2nd to Nth second-pole branches, the second switch corresponding to the second resistor string can be omitted in the N second-pole branches. A common third switch can simultaneously control the switch states of the N second-pole branches, thereby simplifying the insulation detection circuit.

[0017] In a second aspect, an electrical device is provided, comprising:

[0018] The battery includes multiple battery packs; the insulation detection device provided by any of the above technical solutions is connected to the battery packs respectively.

[0019] The electrical equipment uses the aforementioned insulation detection device, which has the characteristics of a simple structure of the insulation detection circuit and a short insulation detection time of the battery pack when the battery pack is powered.

[0020] In a third aspect, a method for detecting insulation is provided, comprising:

[0021] Controlling N first switches and one second switch of the insulation detection circuit to enter a first switch state, wherein in the first switch state, the N first switches and one second switch are all closed, and the nth first switch is connected in series with the first resistor string and connected to the first terminal of the nth battery pack and the ground point;

[0022] In the first switch state, first voltages at first sampling points in the N first resistor strings are collected, and second voltages at second sampling points in the second resistor string are collected; wherein the second resistor string is connected in series with the second switch and then connected to the second electrode of the first battery pack and the ground point;

[0023] controlling N first switches and one second switch to enter a second switch state, wherein in the second switch state, the N first switches are closed and the second switch is open; and connecting an nth suspended second pole branch of the insulation detection circuit to the second pole of the nth battery pack;

[0024] In the second switching state, the first voltages of the first sampling points in the N first resistor strings are respectively collected; the insulation resistance values of the N battery packs are determined based on the first voltage and the second voltage collected in the first switching state and the first voltage collected in the second switching state; wherein N is a positive integer greater than or equal to 2.

[0025] By using this method to perform insulation testing on battery packs, the insulation resistance values of multiple battery packs can be tested at one time, thereby accelerating the insulation testing rate of the battery packs.

[0026] Based on the above solution, in the first switching state, first voltages at first sampling points in the N first resistor strings are respectively collected, including: after the insulation detection circuit enters the first switching state for a first time duration, first voltages at first sampling points in the N first resistor strings are respectively collected, and a second voltage at a second sampling point in the second resistor string is collected.

[0027] The voltages at the first sampling point and the second sampling point are detected respectively only after the insulation detection circuit enters the first switching state for a first time period, thereby ensuring the accuracy of the sampled voltages.

[0028] Based on the above solution, in the second switching state, the first voltages of the first sampling points in the N first resistor strings are respectively collected, including: after the insulation detection circuit enters the second switching state for a second time period, the first voltages of the first sampling points in the N first resistor strings are respectively collected.

[0029] The voltages at the first sampling point and the second sampling point are detected respectively only after the insulation detection circuit enters the second switching state for a second time period, thereby ensuring the accuracy of the sampled voltages.

[0030] Based on the above scheme, the insulation resistance of N battery packs is determined according to the first voltage and the second voltage collected in the first switching state and the first voltage collected in the second switching state, including: determining the insulation resistance of N battery packs according to M first voltages and the M second voltages collected in the first switching state and the M first voltages collected in the second switching state; wherein M is a positive integer greater than or equal to 2.

[0031] In order to ensure the accuracy of the insulation detection of the battery pack, in an embodiment of the present application, the insulation resistance values of N battery packs are jointly determined based on the M first voltages and the second voltages collected in the first on state and the second switch state, respectively, to reduce the phenomenon of poor accuracy of the detection results caused by the error of a single detection.

[0032] In a third aspect, an insulation detection device is provided, including: a control module, an acquisition module, and a determination module; the control module is used to control N first switches and one second switch of the insulation detection circuit to enter a first switch state, wherein, in the first switch state, the N first switches and one second switch are all closed, the nth first switch is connected in series with the first resistor string, and is connected to the first pole and the ground point of the nth battery pack; the acquisition module is used to, in the first switch state, respectively collect the first voltage of the first sampling point in the N first resistor strings, and collect the second voltage of the second sampling point in the second resistor string; wherein, after the second resistor string is connected in series with the second switch, it is connected to the first battery pack. The second pole of the pack is connected to the ground point; the control module is further used to control N first switches and one second switch to enter the second switch state, wherein in the second switch state, the N first switches are closed and the second switch is disconnected; the nth suspended second pole branch of the insulation detection circuit is connected to the second pole of the nth battery pack; the acquisition module is further used to respectively acquire the first voltage of the first sampling point in the N first resistor strings in the second switch state; the determination module is used to determine the insulation resistance of the N battery packs based on the first voltage, the second voltage acquired in the first switch state and the first voltage acquired in the second switch state.

[0033] The 2nd to Nth second pole branches of the insulation detection device provided in the embodiment of the present disclosure are suspended, so that no interference will be generated between the insulation detection circuits of two adjacent battery packs. In this way, the insulation detection circuit collects the voltage at the first sampling point and the second sampling point to detect the insulation resistance of multiple battery packs at one time, thereby improving the efficiency of insulation detection.

[0034] Based on the above solution, the acquisition module is specifically used to collect the first voltages of the first sampling points in the N first resistor strings and the second voltage of the second sampling point in the second resistor string after the insulation detection circuit enters the first switching state for a first time period.

[0035] Based on the above solution, the acquisition module is specifically configured to respectively acquire the first voltages at the first sampling points in the N first resistor strings after the insulation detection circuit enters the second switching state for a second time period.

[0036] Based on the above scheme, a determination module is specifically used to determine the insulation resistance of N battery packs based on M first voltages, M second voltages collected in the first switching state and M first voltages collected in the second switching state; wherein M is a positive integer greater than or equal to 2.

[0037] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0039] Figure 1 Schematic diagram of an insulation testing device;

[0040] Figure 2 Schematic diagram of an insulation testing device;

[0041] Figure 3 Schematic diagram of an insulation testing device;

[0042] Figure 4 A schematic structural diagram of an insulation detection device provided in an embodiment of the present application;

[0043] Figure 5 A schematic structural diagram of an insulation detection device provided in an embodiment of the present application;

[0044] Figure 6 A schematic structural diagram of an insulation detection device provided in an embodiment of the present application;

[0045] Figure 7 An equivalent schematic diagram of an insulation detection device provided in an embodiment of the present application;

[0046] Figure 8 A schematic diagram of the structure of an electrical device provided in an embodiment of the present application;

[0047] Figure 9 A schematic diagram of a flow chart of an insulation detection method provided in an embodiment of the present application;

[0048] Figure 10 A schematic diagram of a flow chart of an insulation detection method provided in an embodiment of the present application;

[0049] Figure 11 An equivalent analysis schematic diagram provided for an embodiment of the present application;

[0050] Figure 12 An equivalent analysis schematic diagram provided for an embodiment of the present application;

[0051] Figure 13 An equivalent analysis schematic diagram provided for an embodiment of the present application;

[0052] Figure 14 An equivalent analysis schematic diagram provided for an embodiment of the present application;

[0053] Figure 15 A schematic structural diagram of an insulation detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0056] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0058] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. 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 application generally indicates that the related objects are in an "or" relationship.

[0059] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0060] The term "plurality" used in this application refers to two or more (including two).

[0061] Figure 1 It is an insulation detection device, including an insulation detection circuit and a controller. Figure 1 The insulation detection circuit shown in Figure 1 includes branches 1 and 2, each including resistors R1 to R4, a main positive relay Kp1, and a negative relay Kp2. A sampling point V1 is located between R1 and R3 in branch 1, and a sampling point V2 is located between R2 and R4 in branch 1. A sampling point V1_S is located between resistors R1 and R3 in branch 2, and a sampling point V2_S is located between short-circuit relays R2 and R4 in branch 2.

[0062] The controller includes a Master Battery Management Unit (MBMU) and a Slave Battery Management Unit (SBMU) 1. The MBMU sends insulation test opening and closing commands to SBMU1 to perform insulation testing. Before closing the main positive contactors Kp1 and Kp2 and the main negative contactors Kn1 and Kn2, the insulation test for the N (N ≥ 2) parallel branch system is performed individually on each battery pack.

[0063] The N (N≥2) branch system cannot perform insulation testing on all branches at the same time. Only one branch can be selected for insulation testing. The insulation status of the monitoring system can be monitored by performing insulation testing on each branch in rotation.

[0064] For an N (N≥2) branch parallel system with only one main positive (or main negative) contactor, if all branches are tested for insulation at the same time before the contactor is closed, the insulation test circuits of each branch will affect each other, causing interference and making it impossible to obtain the accurate system insulation resistance value. Figure 2 and Figure 3The figure shows the insulation detection components included in a two-branch parallel system. For example: When two branches are connected in parallel in the system, the main negative contactors Kn1 and Kn2 are disconnected, and the insulation detection of both branches is performed simultaneously, the detection calculation results interfere with each other and no effective value can be obtained.

[0065] For an N (N≥2) branch parallel system with only one main positive (or main negative) contactor, if one branch is selected for insulation testing before the contactor is closed, the insulation status of all branches cannot be monitored. Figure 2 and Figure 3 Figure 2 shows the insulation detection components included in a two-branch parallel system. For example, for a two-branch parallel system with only one main negative contactor, before the contactor closes, if the insulation test is performed on the first branch, the insulation status of the system's high-voltage positive pole to ground and the insulation status of the first branch's high-voltage negative pole to ground can be monitored, but the insulation status of the second branch's high-voltage negative pole to ground cannot be monitored.

[0066] For a parallel system with N (N ≥ 2) branches and only one main positive (or negative) contactor, if all branches undergo insulation testing in a round-robin fashion before closing the non-shared contactor, the system insulation monitoring cycle will be extended by N times, prolonging the fault reporting time and increasing the risk. For example, if the insulation test time for one branch is T (s), the time required to complete the insulation test for all branches in the system is (N × T) (s).

[0067] In view of this, an embodiment of the present application provides an insulation detection device, in which the 2nd to Nth second-pole branches are suspended. Through these 2nd to Nth second-pole branches, mutual interference between the detection branches of different battery packs can be reduced under different switching states. In this way, within one detection cycle, the positive-to-ground voltage and the negative-to-ground voltage of N battery packs can be detected at one time, thereby achieving synchronous detection of the insulation resistance of each battery pack within one detection cycle, thereby improving detection efficiency and reducing detection delay.

[0068] The insulation detection circuit and insulation detection method provided in the embodiments of this application can be used in electrical devices that use multiple battery packs. Such electrical devices include, but are not limited to, electric vehicles, electric household appliances, and electric smart office equipment. For example, the electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, electric vehicles, electric cars, ships, spacecraft, and the like.

[0069] The electric vehicle disclosed in the embodiments of the present application may be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc. The electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc. The spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0070] like Figure 4 As shown, the present application provides an insulation detection device, comprising:

[0071] An insulation detection circuit, wherein the insulation detection circuit comprises: N first resistor strings, a second resistor string, N second pole branches, N first switches S1 and a second switch S2; N is a positive integer greater than or equal to 2, and n is a positive integer less than N;

[0072] The nth first resistor string is connected in series with the nth first switch, and is used to connect the first electrode of the nth battery pack and the ground point; wherein n is a positive integer less than N; if the first electrode is a positive electrode, the second electrode is a negative electrode; if the first electrode is a negative electrode, the second electrode is a positive electrode;

[0073] The second resistor string is connected in series with the second switch and is connected between the first second pole branch and the grounding point;

[0074] The nth second pole branch is used to connect to the second pole of the nth battery pack; the 2nd to Nth second pole branches are suspended;

[0075] The controller is configured to control N first switches and second switches to enter preset switch states within a sampling cycle, and to collect the first voltage at the first sampling point in the N first resistor strings and the second voltage at the second sampling point in the second resistor strings under the preset switch states; wherein the insulation resistance of the N battery packs is determined based on the first and second voltages collected within a sampling cycle. The insulation detection circuit is a dedicated circuit for detecting electrical insulation and can be either directly connected to the battery pack or separate from the battery pack. If the insulation detection circuit is separate from the battery pack, it can be connected to the battery pack when needed.

[0076] A battery pack can also be called a battery cell. Each battery cell has a positive electrode and a negative electrode. In the embodiment of the present disclosure, the second electrode can be the positive electrode or the negative electrode of the battery cell. If the second electrode is the positive electrode of the battery, the first electrode is the negative electrode of the battery cell. If the second electrode is the negative electrode of the battery cell, the first electrode is the positive electrode of the battery cell. Both the first resistor string and the second resistor string may include one or more resistor strings. For example, the first resistor string and the second resistor string may each include two resistors connected in series. The first collection point is located in the first resistor string, and there is at least one resistor between the first collection point and the grounding point. The second collection point is located in the second resistor string, and there is at least one resistor between the second collection point and the grounding point.

[0077] The first switch and the second switch can both be various types of controlled switches. For example, the first switch and the second switch can both be relays.

[0078] Here, the 2nd to Nth second branches being suspended means that the 2nd to Nth second branches are not connected to the grounding point through a resistor string or a wire.

[0079] In the embodiment of the present disclosure, by switching the switch state, the first voltage and the second voltage at the first sampling point and the second sampling point are respectively detected in different switch states. Then, in combination with the switch state, the series-parallel relationship between the first resistor string and the second resistor string and the insulation resistance of the battery is determined, and finally the insulation resistance of the battery is calculated.

[0080] The insulation quality of the battery pack is then determined based on the insulation resistance. For example, if the insulation resistance value detected based on the first and second voltages is lower than the insulation resistance value of the battery pack with good insulation quality, the battery pack may be considered to have abnormal insulation quality. If the insulation resistance value detected based on the first and second voltages is equal to or higher than the insulation resistance value of the battery pack with good insulation quality, the battery pack may be considered to have good insulation quality.

[0081] After the insulation performance of the battery pack is confirmed to be good, the corresponding battery pack is used to supply power to the outside or to charge the battery pack to ensure the safety of charging and discharging of the battery pack.

[0082] like Figure 5 As shown, the second pole is the positive pole. Branch 1 is used to connect to the first battery pack. The first resistor string includes resistors R1 and R3; the second resistor string includes resistors R2 and R3. The first sampling point is located between resistors R1 and R3. The second sampling point is located between resistors R2 and R4. Resistor Rp in branch 1 is the equivalent insulation resistance of the positive pole of the first battery pack to ground; Rn is the equivalent insulation resistance of the negative pole of the first battery pack to ground. Branch 2 is used to connect to the second battery pack. The second pole branch is directly connected to the positive pole of the second battery pack; the first pole is the negative pole of the second battery pack. It can be seen that resistors R2 and R4 of the second resistor string are connected between the negative pole and the ground point. A second sampling point is set between the second resistor strings. In branch 2, resistor Rp is the equivalent insulation resistance of the positive pole of the second battery pack to ground; Rn is the equivalent insulation resistance of the negative pole of the second battery pack to ground.

[0083] exist Figure 5In the insulation detection circuit shown, the second switch is K1, and the first switch is K1; the second pole is the positive pole. It can be seen that there is a main negative relay Kn1 on the negative branch of the insulation detection circuit of each battery pack; and multiple positive branches share a main positive relay Kp1. The aforementioned controller includes: a master battery management unit (MBMU) communication module and a slave battery management unit (SBMU) 1 communication module. The master battery management unit communication module and the slave battery management unit communication module communicate with each other. For example, the MBMU communication module sends an instruction to obtain the sampled voltage obtained by SBMU1 from the SBMU1 communication module. The sampled voltage of the SBMU1 communication module can be the first voltage collected from the second battery pack through branch 2. SBMU1 itself can also calculate the insulation resistance value of the second battery pack and send the insulation resistance value to the MBMU.

[0084] like Figure 6 As shown, the second terminal is the negative terminal. Branch 1 is used to connect to the first battery pack. The first resistor string includes resistors R1 and R3; the second resistor string includes resistors R2 and R3. The first sampling point is between resistors R1 and R3. The second sampling point is between resistors R2 and R4. Resistor Rp in branch 1 is the equivalent insulation resistance of the positive terminal of the first battery pack to ground; Rn is the equivalent insulation resistance of the negative terminal of the first battery pack to ground.

[0085] Branch 2 connects to the second battery pack. The second pole branch is directly connected to the negative terminal of the second battery pack. The first pole is the positive terminal of the second battery pack. Resistors R2 and R4 of the second resistor string are connected between the positive terminal and ground. A second sampling point is set between the second resistor string. In branch 2, resistor Rp is the equivalent insulation resistance of the second battery pack's positive terminal to ground; Rn is the equivalent insulation resistance of the second battery pack's negative terminal to ground.

[0086] exist Figure 6In the insulation detection circuit shown, the first switch is K1, and the second switch is K1; the second pole is the negative pole. It can be seen that there is a main positive relay Kp1 on the positive branch of the insulation detection circuit of each battery pack; and multiple negative branches share a main negative relay Kn1. The aforementioned controller includes: a master battery management unit (MBMU) communication module and a slave battery management unit (SBMU) 1 communication module. The master battery management unit communication module and the slave battery management unit communication module communicate with each other. For example, the MBMU communication module sends an instruction to obtain the sampled voltage obtained by SBMU1 from the SBMU1 communication module. The sampled voltage of the SBMU1 communication module can be the first voltage collected from the second battery pack through branch 2. SBMU1 itself can also calculate the insulation resistance value of the second battery pack and send the insulation resistance value to the MBMU.

[0087] The above is only an example of an insulating circuit including two branches. The specific implementation is not limited to two branches, and can also be implemented with three branches or four branches.

[0088] If there are 3 or 4 or more branches, the structure of the 2nd branch to the Nth branch can refer to Figure 5 and Figure 6 The structure of branch 2 in .

[0089] In some embodiments, the preset switch state includes:

[0090] a first switch state, in which the N first switches and the N second switches are all closed;

[0091] The second switching state: in the second switching state, the N first switches are closed and the second switches are open.

[0092] In the first switch state, N first switches and one second switch are all closed, and at this time, N first voltages and one second voltage are collected.

[0093] In the second switch state, the N first switches are all closed and the one second switch is closed, then the N first voltages will be collected but the second voltage will not be collected.

[0094] like Figure 7 As shown in FIG, if the second pole is the positive pole, then the equivalent circuit diagram of the insulation detection circuit for the two battery packs in the first switching state. Figure 7The V1 sampling point is the second sampling point of the first battery pack, while the V1 sampling point is the first sampling point of the first battery pack. The V2-S sampling point is the first sampling point of the second battery pack. The master BMU total voltage U1 is the total voltage collected by the MBMU communication unit, while the slave BMU total voltage is the total voltage collected by the SBMU communication unit.

[0095] The equivalent circuit diagram of the insulation detection circuit for the two battery packs in the second switch state is to disconnect the second switch on the corresponding second resistor string.

[0096] The first and second switch states allow the insulation detection circuit to detect the insulation resistance of the battery pack's first and second terminals to ground. Switching between the first and second switch states allows for simple and rapid insulation resistance detection.

[0097] In some embodiments, the controller is specifically used to collect the first voltage of the first sampling point in the N first resistor strings and collect the second voltage of the second sampling point in the second resistor string after entering the first switching state for a first time period; and is used to collect the first voltage of the first sampling point in the N first resistor strings after entering the second switching state for a second time period.

[0098] The first duration and the second duration may be any preset value. For example, the first duration and the second duration may be any value between 2 and 6 seconds.

[0099] Preferably, the first duration and the second duration can both be 3 seconds or 4 seconds.

[0100] The first duration and the second duration may be equal or different. The first voltage and the second voltage are collected after the first switch and the second switch enter the first switching state for a first duration, that is, after the voltages at the first sampling point and the second sampling point stabilize, and the first voltage and the second voltage are collected after the first switch and the second switch enter the second switching state for a second duration, that is, after the voltages at the first sampling point and the second sampling point stabilize, thereby ensuring the accuracy of the sampled voltages used to calculate the insulation resistance value and thus ensuring the accuracy of the insulation resistance value.

[0101] In some embodiments, the controller includes: a first control module, used to control the switching state of the first first switch and the second switch, and generate switch control instructions for controlling the second to N first switches; an mth second control module, used to receive the switch instructions, and control the switching state of the mth first switch according to the control instructions, where m is a positive integer greater than or equal to 2 and less than or equal to N.

[0102] In an embodiment of the present disclosure, the controller includes multiple control modules, which can be divided into master control modules and slave control modules. For example, the master control module can be a control module connected to an insulation detection circuit including a resistor string and used to detect the first battery pack, while the remaining control modules can all be slave control modules.

[0103] The controller includes multiple control modules, including a first control module that controls the first and second switches of the first battery pack and generates switch control instructions for the second through Nth first switches. A second control module receives the switch control instructions from the first control module and controls the switching states of the corresponding first switches, enabling flexible control of the battery packs connected by a single control module. Furthermore, the second control module controls the switching states of the corresponding switches based on the switch control instructions sent by the first control module, thereby enabling linked control of N battery packs for simultaneous insulation testing.

[0104] In some embodiments, the first control module and the second control module are wirelessly connected.

[0105] The first control module and the second control module are connected via Bluetooth wireless connection, WiFi wireless connection, etc.

[0106] The first control module and the second control module are wirelessly connected. The first control module and the second control module can be connected by wire or wirelessly. If the first control module and the second control module are wirelessly connected, the second control module can be easily adjusted according to the number of battery packs to be tested for insulation.

[0107] The first control modules may correspond to Figures 5 to 7 Any of the MBMU communication modules shown, and the second control module can be Figures 5 to 7 Any of the SBMU communication modules shown.

[0108] In one embodiment, the N second pole branches are connected to the same third switch.

[0109] If the third switch is closed, the N second pole branches are turned on, and if the three switches are opened, all the second pole branches are turned off.

[0110] N second-pole branches are connected by a common third switch. Since the connection of the second resistor string is omitted in the 2nd to Nth second-pole branches, the second switch corresponding to the second resistor string can be omitted in the N second-pole branches. A common third switch can simultaneously control the switch states of the N second-pole branches, thereby simplifying the insulation detection circuit.

[0111] like Figure 8 As shown, an embodiment of the present disclosure provides an electric device, including:

[0112] Batteries, including multiple battery packs;

[0113] The insulation detection device provided by any of the above technical solutions is connected to the battery pack respectively.

[0114] The electric device can be any battery-powered device, including but not limited to electric vehicles, electric household appliances, and electric office equipment.

[0115] The battery can be various secondary batteries, including but not limited to lithium batteries and / or sodium batteries.

[0116] The battery includes at least two battery packs, and these battery packs can be connected to the insulation circuit in the insulation detection device respectively.

[0117] The electrical equipment provided in the embodiments of the present application also includes various functional modules. These functional modules may correspond to functions. For example, if the electrical equipment is an electric vehicle, these functional modules may include: the vehicle's sports chassis or on-board equipment.

[0118] Before the battery discharges to the functional module, an insulation circuit is used to perform insulation testing on each battery pack in the battery. In the embodiment of the present application, due to the use of an insulation testing device, insulation testing of multiple battery packs in the battery can be completed in a very short time.

[0119] like Figure 9 As shown, the embodiment of the present disclosure provides an insulation detection method, comprising:

[0120] S110: Controlling N first switches and one second switch of the insulation detection circuit to enter a first switch state, wherein in the first switch state, the N first switches and one second switch are all closed, and the nth first switch is connected in series with the first resistor string and connected to the first terminal of the nth battery pack and the ground point;

[0121] S120: In the first switch state, respectively collect first voltages at first sampling points within the N first resistor strings, and collect second voltages at second sampling points within the second resistor string; wherein the second resistor string is connected in series with the second switch and then to the second terminal of the first battery pack and to the ground point;

[0122] S130: Controlling N first switches and one second switch to enter a second switch state, wherein in the second switch state, the N first switches are closed and the second switch is open; and the nth suspended second electrode branch of the insulation detection circuit is connected to the second electrode of the nth battery pack;

[0123] S140: In the second switch state, first voltages at first sampling points in N first resistor strings are collected respectively;

[0124] S150: Determine the insulation resistance of N battery packs based on the first voltage and the second voltage collected in the first switching state and the first voltage collected in the second switching state; N is a positive integer greater than or equal to 2, and n is a positive integer less than N.

[0125] The insulation detection method provided in the embodiment of the present application can be applied to the insulation detection device provided in any of the above embodiments, and can also be applied to an insulation detection device other than the above insulation detection device, for example, Figure 1 In the insulation detection device shown, it is worth noting that: if it is used in Figure 1 In the insulation detection device shown, the second switches between the second resistor strings on the 2nd to Nth non-suspended second pole branches are maintained in the open state.

[0126] The first voltage and the second voltage are detected in a preset switching state, and then the insulation resistance of the positive pole to the ground and the insulation resistance of the negative pole to the ground of each battery pack can be solved based on the first voltage and the second voltage, which has the characteristic of high insulation detection efficiency.

[0127] In summary, by using the insulation detection method provided in the embodiment of the present application to perform insulation detection on a battery pack, the insulation resistance values of multiple battery packs can be detected at one time, thereby accelerating the insulation detection rate of the battery pack.

[0128] S120 may include: after the insulation detection circuit enters the first switching state for a first time period, respectively collecting first voltages at first sampling points in the N first resistor strings, and collecting second voltages at second sampling points in the second resistor string.

[0129] The first time length here can be any pre-set time length, which can be the time length during which the voltages at the first sampling point and the second sampling point stabilize after the insulation detection circuit switches to the first switching state. Specifically, the first time length can be 2 to 6 seconds, and the preferred value can be 3 seconds or 4 seconds.

[0130] The voltages at the first sampling point and the second sampling point are detected respectively only after the insulation detection circuit enters the first switching state for a first time period, thereby ensuring the accuracy of the sampled voltages.

[0131] In some embodiments, S140 may include: after the insulation detection circuit enters the second switching state for a second time period, respectively collecting first voltages at first sampling points in the N first resistor strings.

[0132] The second time length here can be any pre-set time length, which can be the time length during which the voltages at the first sampling point and the second sampling point stabilize after the insulation detection circuit switches to the second switching state. Specifically, the second time length can be 2 to 6 seconds, and the preferred value can be 3 seconds or 4 seconds.

[0133] The voltages at the first sampling point and the second sampling point are detected respectively only after the insulation detection circuit enters the second switching state for a second time period, thereby ensuring the accuracy of the sampled voltages.

[0134] In some embodiments, S150 may include: determining the insulation resistance of N battery packs based on M first voltages, M second voltages collected in the first switching state, and M first voltages collected in the second switching state; wherein M is a positive integer greater than or equal to 2.

[0135] by Figure 5 Taking the insulation detection device shown in FIG. 1 as an example, the method shown in FIG. 9 can be used to perform insulation detection on two battery packs, which may specifically include:

[0136] Step 1: MUMU (short for MUMU communication unit) sends a command to SBMU1 (short for SUMU1 communication unit), instructing SBMU1 to close the isolation sampling circuit switch K1 on branch 2 connected to the second battery pack;

[0137] Step 2: Close switches K1 and K2 of branch 1 connected to the first battery pack, so that the insulation detection circuit enters the first switching state.

[0138] Step 3: After waiting for T1(s), SBMU1 obtains the sampled voltage V2-S1, and MBMU obtains the sampled voltages V1 and V2. Here, T1(s) is the aforementioned time duration.

[0139] Step 4: Turn off the switch K2 of branch 1, thereby entering the second switching state.

[0140] Step 5: After waiting for T2(s), the MBMU re-obtains the voltage V1', which is used to calculate the insulation resistance of branch 1.

[0141] Step 6: Send the voltage V1 collected by the MBMU to SBMU1 for SBMU1 to calculate the insulation resistance of branch 2.

[0142] Step 7: SBMU1 sends the calculated insulation resistance of branch 2 to MBUMU;

[0143] Step 8: The MBMU verifies the insulation resistance based on the current connection status of the insulation circuit to determine whether the insulation resistance of the current battery pack is abnormal.

[0144] Figures 11 to 14 It is based on Figure 5 and Figure 7 The diagram shows an equivalent analysis of the insulation detection circuit detecting the insulation resistance of a battery pack. Figure 11 and Figure 12yes Figure 5 Schematic diagram of equivalent analysis of the insulation resistance of the circuit shown in the first switching state. Figure 13 and Figure 14 yes Figure 5 Schematic diagram of equivalent analysis of the insulation resistance of the circuit shown in the second switching state.

[0145] In the first switching state, Figure 11 The total pressure U1 of the MBMU shown in is Up1+Un1, and has the following functional relationship:

[0146]

[0147] Where:

[0148] U p1 Indicates the high voltage between the positive electrode of the first battery pack and the ground in the simplified schematic diagram;

[0149] U n1 Indicates the high voltage between the negative terminal of the first battery pack and the ground in the simplified schematic diagram

[0150] R1 represents the resistance of the positive pole to ground bridge arm of the MBMU insulation detection circuit;

[0151] R2 represents the resistance of the negative pole to ground bridge arm of the MBMU insulation detection circuit;

[0152] R p Indicates the insulation resistance of the positive electrode of the first battery pack in the system to the ground;

[0153] R n_s1 Indicates the insulation resistance of the MBMU high-voltage negative electrode to ground in the system;

[0154] R n_s2 Indicates the insulation resistance between the MBMU high-voltage negative terminal and ground in this system.

[0155] Figure 12 The total pressure U2 of the SBMU shown in is Up2+Un2, and has the following functional relationship:

[0156] We can get formula (2):

[0157]

[0158] Where:

[0159] U p2 Indicates the high voltage of the positive electrode of the second battery pack to the ground in the simplified schematic diagram;

[0160] U n2 Indicates the high voltage between the negative electrode of the second battery pack and the ground in the simplified schematic diagram;

[0161] According to the simplified schematic diagram of the insulation detection S4, S5, S6 stage circuit (attached Figure 10 ,11)Analysis:

[0162] like Figure 13 As shown, the MBMU total pressure U1 can be analyzed to obtain formula (3):

[0163]

[0164] Where:

[0165] U p3 Indicates the high voltage between the positive electrode of the first battery pack and the ground in the simplified schematic diagram;

[0166] U n4 Indicates the high voltage between the negative electrode of the first battery pack and the ground in the simplified schematic diagram;

[0167] like Figure 14 As shown, the SBMU total pressure U2 is analyzed and formula (4) can be obtained:

[0168]

[0169] Where:

[0170] U p4 Indicates the high voltage of the positive electrode of the second battery pack to the ground in the simplified schematic diagram;

[0171] U n4 Indicates the high voltage of the negative electrode of the second battery pack to the ground in the simplified schematic diagram;

[0172] According to the voltage superposition principle:

[0173] U1=U p1 +U n1 (5)

[0174] U2=U p2 +U n2 (6)

[0175] U3=U p3 +U n3 (7)

[0176] U4=U p4 +U n4 (8)

[0177] Where:

[0178] U1 represents the total voltage of the first battery pack in steps 1 to 3;

[0179] U2 represents the total voltage of the second battery pack in steps 1 to 3 of the insulation test phase;

[0180] U3 represents the total pressure of the first battery pack in steps 4 to S6;

[0181] U4 represents the total voltage of the second battery pack in steps 4 to S6. According to the above formulas 1 to 4, the system insulation resistance R can be calculated. p ,R n_s1 ,R n_s2 .

[0182] After the insulation resistance value calculated by SBMU1 is sent to MBMU, the insulation resistance calculation results of different branches of the common contactor branch are compared to see if they are within the range of ±10%. If the insulation resistance exceeds this range for M consecutive times (for example, M is 4 or 5 resistance values), it is determined that there is an abnormality in the insulation detection circuit of this branch.

[0183] like Figure 15 As shown, an embodiment of the present disclosure provides an insulation detection device, including: a control module 110, a collection module 120, and a determination module 130; the control module 110 is configured to control N first switches and one second switch of the insulation detection circuit to enter a first switch state, wherein in the first switch state, the N first switches and one second switch are all closed, and the nth first switch is connected in series with the first resistor string and connected to the first terminal of the nth battery pack and the ground point;

[0184] Acquisition module 120, configured to acquire, in a first switch state, first voltages at first sampling points within each of the N first resistor strings, and to acquire second voltages at second sampling points within the second resistor string; wherein the second resistor string is connected in series with the second switch and then to the second terminal of the first battery pack and to a ground point;

[0185] The control module 110 is further configured to control the N first switches and one second switch to enter a second switch state, wherein in the second switch state, the N first switches are closed and the second switch is open; the nth suspended second pole branch of the insulation detection circuit is connected to the second pole of the nth battery pack; the acquisition module 120 is further configured to respectively acquire the first voltages at the first sampling points in the N first resistor strings in the second switch state;

[0186] The determination module 130 is configured to determine the insulation resistance values of the N battery packs based on the first voltage and the second voltage collected in the first switching state and the first voltage collected in the second switching state.

[0187] In some embodiments, the control module 110 , the acquisition module 120 , and the determination module 130 may be program modules; after being executed by a processor, the program modules can implement the functions of the above modules.

[0188] In other embodiments, the control module 110, the acquisition module 120, and the determination module 130 may be a combination of soft and hard modules, including but not limited to various programmable arrays, including but not limited to field programmable arrays and / or complex programmable arrays.

[0189] In some other embodiments, the control module 110 , the acquisition module 120 , and the determination module 130 may be pure hardware modules; pure hardware modules include but are not limited to application-specific integrated circuits.

[0190] The 2nd to Nth second pole branches of the insulation detection device provided in the embodiment of the present disclosure are suspended, so that no interference will be generated between the insulation detection circuits of two adjacent battery packs. In this way, the insulation detection circuit collects the voltage at the first sampling point and the second sampling point to detect the insulation resistance of multiple battery packs at one time, thereby improving the efficiency of insulation detection.

[0191] In some embodiments, the acquisition module 120 is specifically configured to acquire the first voltages of the first sampling points in the N first resistor strings and the second voltages of the second sampling points in the second resistor string after the insulation detection circuit enters the first switching state for a first time period.

[0192] In some embodiments, the acquisition module 120 is specifically configured to respectively acquire the first voltages at the first sampling points in the N first resistor strings after the insulation detection circuit enters the second switching state for a second duration.

[0193] In some embodiments, the determination module 130 is specifically used to determine the insulation resistance of N battery packs based on M first voltages, M second voltages collected in the first switching state and M first voltages collected in the second switching state; wherein M is a positive integer greater than or equal to 2.

[0194] An embodiment of the present application provides an electronic device, including:

[0195] Memory, which stores computer-executable instructions;

[0196] The processor is connected to the memory and is used to implement the insulation detection method provided by any of the above technical solutions by executing computer executable instructions, for example, at least Figure 9 and / or Figure 10 The method shown.

[0197] The electronic device includes but is not limited to a battery management system (BMS) chip of various batteries or a CPU of an onboard device.

[0198] The memory includes but is not limited to storage media such as ROM, RAM, and Flash. The processor includes but is not limited to: CPU, MCU, or ASIC.

[0199] The memory and processor can be connected through a bus to realize data exchange between the processor and the memory.

[0200] The electronic device can execute the insulation detection method provided by any of the above technical solutions. For example, it can execute Figures 2 to 4 Any of the provided methods.

[0201] The embodiment of the present application provides a computer storage medium, which stores computer executable instructions; after the computer executable instructions are executed, the insulation detection method provided by any of the above technical solutions can be implemented. For example, the executable instructions Figures 9 and 10 Any of the provided methods.

[0202] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An insulation detection device, characterized in that: include: An insulation detection circuit, comprising: N first resistor strings, a second resistor string, N second pole branches, N first switches, and a second switch, wherein N is a positive integer greater than or equal to 2; The nth first resistor string is connected in series with the nth first switch, and is used to connect the first electrode of the nth battery pack and the ground point; n is a positive integer less than N; if the first electrode is a positive electrode, the second electrode is a negative electrode; if the first electrode is a negative electrode, the second electrode is a positive electrode; The second resistor string is connected in series with the second switch and connected between the first second pole branch and the grounding point; The nth second pole branch is used to connect to the second pole of the nth battery pack; the second to Nth second pole branches are suspended; The controller is configured to control N of the first switches and second switches to enter a preset switch state within a sampling period, and to collect a first voltage at a first sampling point in the N first resistor strings and a second voltage at a second sampling point in the second resistor strings in the preset switch state; and to determine the insulation resistance of the N battery packs based on the first voltage and the second voltage collected within the sampling period.

2. The insulation detection device according to claim 1, characterized in that: The preset switch states include: a first switch state, in which the N first switches and the N second switches are all closed; A second switching state, in which N first switches are closed and the second switches are open.

3. The insulation detection device according to claim 2, characterized in that: The controller is specifically configured to collect a first voltage at a first sampling point in the N first resistor strings and collect a second voltage at a second sampling point in the second resistor string after entering the first switch state for a first duration; And it is used to collect the first voltages of the first sampling points in the N first resistor strings after entering the second switching state for a second time period.

4. The insulation detection device according to any one of claims 1 to 3, characterized in that: The controller includes: a first control module, configured to control the switch states of the first first switch and the second switch, and generate switch control instructions for controlling the second to Nth first switches; The mth second control module is configured to receive the switch control instruction and control the switch state of the mth first switch according to the control instruction, wherein m is a positive integer greater than or equal to 2 and less than or equal to N.

5. The insulation detection device according to claim 4, characterized in that: The first control module and the second control module are wirelessly connected.

6. The insulation detection device according to any one of claims 1 to 5, characterized in that: The N second-pole branches are connected to the same third switch.

7. An electrical device, characterized in that: include: Batteries, including multiple battery packs; The insulation detection device according to any one of claims 1 to 6 is connected to the battery pack respectively.

8. A method for detecting insulation, characterized in that: include: controlling N first switches and one second switch of the insulation detection circuit to enter a first switch state, wherein in the first switch state, the N first switches and one second switch are all closed, and the nth first switch is connected in series with the first resistor string and connected to the first terminal of the nth battery pack and the ground point; In the first switch state, first voltages at first sampling points in N first resistor strings are collected, and second voltages at second sampling points in a second resistor string are collected; wherein the second resistor string is connected in series with the second switch and then connected to the second electrode of the first battery pack and a ground point; controlling N first switches and one second switch to enter a second switch state, wherein in the second switch state, the N first switches are closed and the second switch is open; and connecting the nth suspended second electrode branch of the insulation detection circuit to the second electrode of the nth battery pack; In the second switch state, respectively collecting the first voltages of the first sampling points in the N first resistor strings; The insulation resistance values of the N battery packs are determined based on the first voltage and the second voltage collected in the first switching state and the first voltage collected in the second switching state, where N is a positive integer greater than or equal to 2 and n is a positive integer less than N.

9. The method according to claim 8, characterized in that The step of respectively collecting the first voltages of the first sampling points in the N first resistor strings in the first switch state includes: After the insulation detection circuit enters the first switch state for a first time period, first voltages at first sampling points in N first resistor strings are collected, and second voltages at second sampling points in the second resistor string are collected.

10. The method according to claim 8 or 9, characterized in that The step of respectively collecting the first voltages of the first sampling points in the N first resistor strings in the second switch state includes: After the insulation detection circuit enters the second switch state for a second time period, the first voltages of the first sampling points in the N first resistor strings are respectively collected.

11. The method according to any one of claims 8 to 10, characterized in that The determining the insulation resistance values of the N battery packs according to the first voltage and the second voltage collected in the first switching state and the first voltage collected in the second switching state includes: The insulation resistance values of N battery packs are determined based on the M first voltages, M second voltages, and M first voltages collected in the first switching state; wherein the M are positive integers greater than or equal to 2.

12. An insulation detection device, characterized in that: include: Control module, acquisition module and determination module; The control module is configured to control N first switches and one second switch of the insulation detection circuit to enter a first switch state, wherein in the first switch state, the N first switches and one second switch are all closed, the nth first switch is connected in series with the first resistor string, and is connected to the first terminal of the nth battery pack and the ground point, where N is a positive integer greater than or equal to 2, and n is a positive integer less than N; The acquisition module is configured to acquire, in the first switch state, first voltages at first sampling points within each of the N first resistor strings and second voltages at second sampling points within the second resistor string; wherein the second resistor string is connected in series with the second switch and then connected to the second terminal of the first battery pack and a ground point; The control module is further configured to control the N first switches and the one second switch to enter a second switch state, wherein in the second switch state, the N first switches are closed and the second switch is open; and the nth suspended second electrode branch of the insulation detection circuit is connected to the second electrode of the nth battery pack; The acquisition module is further configured to respectively acquire the first voltages of the first sampling points in the N first resistor strings in the second switch state; The determination module is configured to determine the insulation resistance values of the N battery packs based on the first voltage and the second voltage collected in the first switching state and the first voltage collected in the second switching state.

13. The device according to claim 12, characterized in that The acquisition module is specifically configured to acquire the first voltages of the first sampling points in the N first resistor strings and the second voltages of the second sampling points in the second resistor string after the insulation detection circuit enters the first switch state for a first time period.

14. The device according to claim 12 or 13, characterized in that The acquisition module is specifically configured to respectively acquire the first voltages of the first sampling points in the N first resistor strings after the insulation detection circuit enters the second switch state for a second duration.

15. The device according to any one of claims 12 to 14, characterized in that The determination module is specifically used to determine the insulation resistance of N battery packs based on M first voltages, M second voltages collected in the first switching state, and M first voltages collected in the second switching state; wherein the M are positive integers greater than or equal to 2.

16. An electronic device, characterized in that: include: Memory, which stores computer-executable instructions; A processor, connected to the memory, configured to implement the method provided in any one of claims 8 to 11 by executing the computer-executable instructions.

17. A computer storage medium, characterized in that The computer storage medium stores computer-executable instructions, and after the computer-executable instructions are executed by the processor, the method provided in any one of claims 8 to 11 can be implemented.

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