Insulation detection method and device, electronic equipment, storage medium and program product

Abstract

The present disclosure relates to an insulation detection method and device, electronic equipment, storage medium and program product, and relates to the technical field of batteries, and is applied to an insulation detection circuit, which comprises a battery pack module, a load module and a switch assembly, the battery pack module is connected with the load module through the switch assembly, and the method comprises the following steps: obtaining a target sampling voltage according to a switch state of the switch assembly, the target sampling voltage comprising at least two voltages of a voltage between the battery pack module and a voltage between the load module; and determining an insulation state of the battery pack module and / or the load module according to the target sampling voltage. According to the present disclosure, the sampling voltage of at least two endpoints between the battery pack module and the load module is obtained according to the switch state of the switch assembly, so that the insulation state of the battery pack module and / or the load module is determined, the detection range of the insulation detection is enlarged, and the safety and reliability of the battery pack are improved.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to an insulation testing method, apparatus, electronic device, storage medium, and program product. Background Technology

[0002] Battery pack insulation testing is a core guarantee for the safe operation of new energy vehicles. Deterioration in battery pack insulation can lead to leakage current, causing safety issues such as cable overheating and component burnout. Furthermore, if the insulation of the vehicle's high-voltage battery system fails, current can be conducted through the casing, posing a risk of electric shock. By conducting insulation testing on the battery pack, potential hazards where insulation resistance falls below the safe threshold can be detected early, thereby building a safety barrier between the high-voltage battery system and the external environment, ensuring the safety and reliability of vehicle operation. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this disclosure provides an insulation testing method, apparatus, electronic device, storage medium, and program product.

[0004] According to a first aspect of the present disclosure, an insulation detection method is provided, applied to an insulation detection circuit, the circuit including: a battery pack module, a load module, and a switching assembly, the battery pack module being connected to the load module via the switching assembly; the method includes:

[0005] The target sampling voltage is obtained based on the switching state of the switching component; the target sampling voltage includes at least two of the voltages across the battery pack module and the voltages across the load module.

[0006] The insulation state of the battery pack module and / or the load module is determined based on the target sampling voltage.

[0007] Thus, the switching component in this disclosure can control the connection state of the battery pack module and the load module. Based on different switching states of the switching component, the sampling voltages at different endpoints of the battery pack module and the load module can be obtained, thereby determining the insulation state of the battery pack module and / or the load module. This is not limited to insulation detection of the battery pack module, but expands the detection range of insulation detection and improves the safety and reliability of the battery pack.

[0008] In one possible embodiment, obtaining the target sampling voltage based on the switching state of the switching component includes:

[0009] Based on the switching state of the switching assembly, voltage sampling points are determined from both ends of the battery pack module and both ends of the load module;

[0010] The voltage at the voltage sampling point is taken as the target sampling voltage.

[0011] In this way, by determining voltage sampling points from both ends of the battery pack module and the load module, the insulation detection range can be expanded beyond the battery pack module, thus improving the safety and reliability of the battery pack.

[0012] In one possible embodiment, determining the insulation state of the battery pack module and / or the load module based on the target sampling voltage includes:

[0013] The insulation state of the voltage sampling point is determined based on the target sampling voltage.

[0014] In this way, since the voltage sampling point can be any endpoint between the two ends of the battery pack module and the two ends of the load module, insulation testing can be performed on both the battery pack module and the load module, thus expanding the detection range of insulation testing.

[0015] In one possible embodiment, the battery pack module includes at least one battery pack, and obtaining the target sampling voltage based on the switching state of the switching component includes:

[0016] The target sampling voltage is obtained based on the switching state of the switching component and the connection method of the at least one battery pack.

[0017] In this way, by combining the switching state of the switch assembly and the connection method of at least one battery pack, the target sampling voltage at at least two of the two ends of the battery pack module and the two ends of the load module can be obtained, which can improve the flexibility and adaptability of insulation detection.

[0018] In one possible embodiment, the at least one battery pack module includes a first battery pack and a second battery pack, and the first battery pack and the second battery pack are connected in parallel, in series, or as a single pack.

[0019] In this way, under the dual-battery pack architecture, the insulation status of different ports can be detected according to the addition method of parallel connection, series connection and single pack connection, which improves the flexibility and adaptability of insulation detection.

[0020] In one possible embodiment, the switching assembly includes a first switch and a second switch; a first terminal of the first switch is connected to the positive terminal of the battery pack module, a second terminal of the first switch is connected to the load module, a first terminal of the second switch is connected to the negative terminal of the battery pack module, and a second terminal of the second switch is connected to the load module.

[0021] In this way, the insulation status of different ports can be detected under different switching states of the first and second switches, improving the flexibility and adaptability of insulation detection.

[0022] In one possible embodiment, obtaining the target sampling voltage based on the switching state of the switching component and the connection method of the at least one battery pack includes:

[0023] The target sampling voltage is obtained based on the switching states of the first and second switches, and the connection method of the first and second battery packs.

[0024] In this way, by combining the switching state of the switch assembly and the connection method of the first and second battery packs, the target sampling voltage of at least two of the two ends of the battery pack module and the two ends of the load module can be obtained, which can improve the flexibility and adaptability of insulation detection.

[0025] In one possible embodiment, the target sampling voltage includes a first sampling voltage and a second sampling voltage; obtaining the target sampling voltage based on the switching states of the first and second switches, and the connection method of the first and second battery packs, includes:

[0026] When the access method is series access or parallel access, and both the first switch and the second switch are closed, the first sampling voltage of the positive terminal of the second battery pack and the second sampling voltage of the negative terminal of the first battery pack are obtained.

[0027] In this way, under high voltage conditions where the first and second battery packs are connected in series or in parallel, the sampling voltages of the positive terminal of the second battery pack and the negative terminal of the first battery pack can be obtained to detect the insulation status at both ends of the battery pack module.

[0028] In one possible embodiment, determining the insulation state of the battery pack module and / or load module based on the target sampling voltage includes:

[0029] Based on the first sampling voltage and the second sampling voltage, the insulation state of the positive terminal of the second battery pack and the negative terminal of the first battery pack is determined.

[0030] In this way, under high voltage conditions where the first and second battery packs are connected in series or in parallel, the insulation status at both ends of the battery pack module can be detected.

[0031] In one possible embodiment, the target sampling voltage includes a first sampling voltage, a second sampling voltage, a third sampling voltage, and a fourth sampling voltage; obtaining the target sampling voltage based on the switching states of the first and second switches, and the connection method of the first and second battery packs, includes:

[0032] When the access method is series access and the first switch and the second switch are open, the first sampled voltage of the positive terminal of the second battery pack, the second sampled voltage of the negative terminal of the first battery pack, the third sampled voltage of the positive terminal of the load module, and the fourth sampled voltage of the negative terminal of the load module are obtained.

[0033] In this way, under the non-high voltage condition where the first and second battery packs are connected in series, the sampling voltages at both ends of the battery pack and the load can be obtained to detect the insulation status at both ends of the battery pack module and the load.

[0034] In one possible embodiment, determining the insulation state of the battery pack module and / or load module based on the target sampling voltage includes:

[0035] Based on the first sampling voltage and the second sampling voltage, the insulation state of the positive terminal of the second battery pack and the negative terminal of the first battery pack is determined;

[0036] Based on the third and fourth sampling voltages, the insulation state of the positive and negative terminals of the load module is determined.

[0037] In this way, under non-high voltage conditions where the first and second battery packs are connected in series, the insulation status of the two ends of the battery pack module and the two ends of the load can be detected.

[0038] In one possible embodiment, the target sampling voltage includes a second sampling voltage and a third sampling voltage; obtaining the target sampling voltage based on the switching states of the first switch and the second switch, and the connection method of the first battery pack and the second battery pack includes:

[0039] When the access method is that the first battery pack is connected as a single pack, and the first switch is open and the second switch is closed, the second sampling voltage of the negative terminal of the first battery pack and the third sampling voltage of the positive terminal of the load module are obtained.

[0040] In this way, under the high-voltage condition of the first battery pack being connected as a single unit, the sampling voltages at both ends of the battery pack and the load can be obtained to detect the insulation status between the negative terminal of the first battery pack and the positive terminal of the load module.

[0041] In one possible embodiment, determining the insulation state of the battery pack module and / or load module based on the sampled voltage includes:

[0042] Based on the second sampling voltage and the third sampling voltage, the insulation state between the negative terminal of the first battery pack and the positive terminal of the load module is determined.

[0043] In this way, under the high voltage condition of the first battery pack being connected as a single unit, the insulation status between the negative terminal of the first battery pack and the positive terminal of the load module can be detected.

[0044] In one possible embodiment, the target sampling voltage includes a first sampling voltage and a fourth sampling voltage; obtaining the target sampling voltage based on the switching states of the first and second switches, and the connection method of the first and second battery packs, includes:

[0045] When the access method is single-pack access of the second battery pack, and the first switch is closed and the second switch is open, the first sampling voltage of the positive terminal of the second battery pack and the fourth sampling voltage of the negative terminal of the load module are obtained.

[0046] In this way, under the high-voltage condition of the second battery pack being connected as a single unit, the insulation status between the negative terminal of the first battery pack and the positive terminal of the load module can be detected.

[0047] In one possible embodiment, determining the insulation state of the battery pack module and / or load module based on the sampled voltage includes:

[0048] Based on the first sampling voltage and the fourth sampling voltage, the insulation state between the positive terminal of the second battery pack and the negative terminal of the load module is determined.

[0049] In this way, under the high-voltage condition of the second battery pack being connected as a single unit, the insulation status between the negative terminal of the first battery pack and the positive terminal of the load module can be detected.

[0050] According to a second aspect of the present disclosure, an insulation detection device is provided, applied to an insulation detection circuit, the circuit including: a battery pack module, a load module, and a switching assembly, the battery pack module being connected to the load module via the switching assembly; the device includes:

[0051] The acquisition module is configured to acquire a target sampling voltage based on the switching state of the switching component; the target sampling voltage includes at least two voltages, namely the voltage across the battery pack module and the voltage across the load module.

[0052] The determination module is configured to determine the insulation state of the battery pack module and / or the load module based on the target sampling voltage.

[0053] In one possible embodiment, the acquisition module is configured to:

[0054] Based on the switching state of the switching assembly, voltage sampling points are determined from both ends of the battery pack module and both ends of the load module;

[0055] The voltage at the voltage sampling point is taken as the target sampling voltage.

[0056] In one possible embodiment, the determining module is configured to:

[0057] The insulation state of the voltage sampling point is determined based on the target sampling voltage.

[0058] In one possible embodiment, the battery pack module includes at least one battery pack, and the acquisition module is configured to:

[0059] The target sampling voltage is obtained based on the switching state of the switching component and the connection method of the at least one battery pack.

[0060] In one possible embodiment, the at least one battery pack module includes a first battery pack and a second battery pack, and the first battery pack and the second battery pack are connected in parallel, in series, or as a single pack.

[0061] In one possible embodiment, the switching assembly includes a first switch and a second switch; a first terminal of the first switch is connected to the positive terminal of the battery pack module, a second terminal of the first switch is connected to the load module, a first terminal of the second switch is connected to the negative terminal of the battery pack module, and a second terminal of the second switch is connected to the load module.

[0062] In one possible embodiment, obtaining the target sampling voltage based on the switching state of the switching component and the connection method of the at least one battery pack includes:

[0063] The target sampling voltage is obtained based on the switching states of the first and second switches, and the connection method of the first and second battery packs.

[0064] According to a third aspect of the present disclosure, an electronic device is provided, comprising:

[0065] processor;

[0066] Memory used to store processor-executable instructions;

[0067] The processor is configured to execute processor-executable instructions in the memory to implement the steps of the method described in the first aspect of the present disclosure.

[0068] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in the first aspect of the present disclosure.

[0069] According to a fifth aspect of the present disclosure, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the method described in the first aspect of the present disclosure.

[0070] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0071] This disclosure applies to an insulation detection circuit, which includes a battery pack module, a load module, and a switching assembly. The battery pack module is connected to the load module via the switching assembly. The method includes: acquiring a target sampling voltage based on the switching state of the switching assembly, the target sampling voltage including at least two voltages among the voltages across the battery pack module and the load module; and determining the insulation state of the battery pack module and / or the load module based on the target sampling voltage. The switching assembly in this disclosure can control the connection state of the battery pack module and the load module. Based on different switching states of the switching assembly, sampling voltages at different endpoints of the battery pack module and the load module can be acquired, thereby determining the insulation state of the battery pack module and / or the load module. This method is not limited to insulation detection of the battery pack module, but expands the detection range of insulation detection, improving the safety and reliability of the battery pack.

[0072] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0073] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0074] Figure 1 This is a flowchart illustrating an insulation testing method according to an exemplary embodiment.

[0075] Figure 2 This is a schematic diagram of an insulation detection circuit according to an exemplary embodiment.

[0076] Figure 3 This is a schematic diagram of another insulation detection circuit according to an exemplary embodiment.

[0077] Figure 4 This is a flowchart illustrating an insulation testing method based on a dual-battery pack architecture.

[0078] Figure 5 This is a block diagram illustrating an insulation detection device according to an exemplary embodiment.

[0079] Figure 6 This is a block diagram illustrating an electronic device according to an exemplary embodiment. Detailed Implementation

[0080] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0081] Figure 1 This is a flowchart illustrating an insulation testing method according to an exemplary embodiment, applied to... Figure 2 The insulation detection circuit shown may include: a battery pack module, a load module, and a switching assembly. The battery pack module is connected to the load module via the switching assembly, as shown below. Figure 1 As shown, the method may include the following steps.

[0082] In step S101, the target sampling voltage is obtained based on the switching state of the switching component. The target sampling voltage includes at least two of the voltages across the battery pack module and the load module.

[0083] For example, the battery pack module in this disclosure may include one battery pack or multiple battery packs, such as a dual-battery pack architecture. The insulation detection circuit in this disclosure may also include an insulation detection module, which can be connected to both ends of the battery pack module and both ends of the load module. The insulation detection module can be used to collect the voltage at either end of the battery pack module or the load module.

[0084] In some embodiments, voltage sampling points are determined from both ends of the battery pack module and both ends of the load module according to the switching state of the switching component, and then the voltage of the voltage sampling points is used as the target sampling voltage.

[0085] In one possible implementation, the insulation detection module can simultaneously acquire the voltage across the battery pack module and the voltage across the load module, obtaining sampled voltages at four different ports. Under different switching states of the switching components, voltage sampling points can be determined from the four ports, and the sampled voltage corresponding to each sampling point can be used as the target sampling voltage.

[0086] In another possible implementation, the insulation detection module can first determine voltage sampling points from both ends of the battery pack module and the load module based on the switching state of the switching components, and then collect the voltage at these sampling points as the target sampling voltage. For example, when the voltage sampling points are both ends of the load module, only the voltage at both ends of the load can be collected as the target sampling voltage, without needing to collect the voltage at all four ports.

[0087] In other embodiments, when the battery pack module includes multiple battery packs, the multiple battery packs can have various different connection methods. Voltage sampling points can be determined based on the switching state of the switching component and the connection methods of the multiple battery packs, and the sampled voltage at the voltage sampling point can be used as the target sampling voltage.

[0088] In step S102, the insulation status of the battery pack module and / or load module is determined based on the target sampling voltage.

[0089] For example, since the voltage sampling points are at least two of the two ends of the battery pack module and the two ends of the load module, the insulation state of the voltage sampling points can be determined based on the target sampling voltage, thereby obtaining the insulation state of the battery pack module and / or the load module.

[0090] For example, taking the voltage sampling points as the two ends of the load module, the target sampling voltage can be the voltage across the two ends of the load module, and the insulation state of the load module can be determined based on the voltage across the load module. Similarly, taking the voltage sampling points as the positive terminal of the battery pack module and the negative terminal of the load module, the target sampling voltage can be the positive voltage of the battery pack module and the negative voltage of the load module, and the insulation state of the positive terminal of the battery pack module and the negative terminal of the load module can be determined based on the positive voltage of the battery pack module and the negative voltage of the load module.

[0091] In summary, this disclosure applies to an insulation detection circuit, which includes a battery pack module, a load module, and a switching assembly. The battery pack module is connected to the load module via the switching assembly. The method includes: acquiring a target sampling voltage based on the switching state of the switching assembly, the target sampling voltage including at least two voltages among the voltages across the battery pack module and the load module; and determining the insulation state of the battery pack module and / or the load module based on the target sampling voltage. The switching assembly in this disclosure can control the connection state of the battery pack module and the load module. Based on different switching states of the switching assembly, sampling voltages at different endpoints of the battery pack module and the load module can be acquired, thereby determining the insulation state of the battery pack module and / or the load module. This method is not limited to insulation detection of the battery pack module, but expands the detection range of insulation detection, improving the safety and reliability of the battery pack.

[0092] In some embodiments, the battery pack module may include at least one battery pack, and one implementation of step S101 may be:

[0093] The target sampling voltage is obtained based on the switching state of the switching component and the connection method of at least one battery pack.

[0094] For example, a battery pack module may include one battery pack or multiple battery packs. When a battery pack module includes multiple battery packs, there are multiple ways to connect the multiple battery packs to the circuit, such as series connection, parallel connection, a combination of series and parallel connection, or single-packet connection. For instance, one or more switches can be set between the multiple battery packs within the battery pack module to achieve different connection methods. Different switch states and different combinations of battery pack connection methods can correspond to different voltage sampling points, and the target sampling voltage can be obtained through these voltage sampling points.

[0095] Electric vehicles are currently undergoing a shift towards higher voltage platforms, gradually evolving from the traditional 400V to 800V and even 1000V systems. Simultaneously, to adapt to low-voltage charging stations in the market, the industry generally chooses two approaches: 1. BOOST (boost) scheme; 2. Dual-pack architecture scheme. The dual-pack scheme offers lower costs and higher charging efficiency, but it is also more architecturally complex, and traditional insulation detection strategies cannot meet the requirements. This disclosure proposes an insulation detection method based on a dual-battery pack architecture.

[0096] Figure 3 This is a schematic diagram of an insulation detection circuit, such as... Figure 3 As shown, taking a dual-battery-pack architecture as an example, at least one battery pack module includes a first battery pack Pack1 and a second battery pack Pack2. The first and second battery packs can be connected in parallel, in series, or as a single pack. The connection method of the first and second battery packs can be controlled by control switch S0. The battery pack module can be connected to the load through a direct charging interface or a DC link. K1 and K2 are used to control the connection or disconnection between the direct charging interface and the battery pack module, and K3 and K4 are used to control the connection or disconnection between the DC link and the battery pack module.

[0097] The switching assembly may include a first switch S1 and a second switch S2. The first end of the first switch may be connected to the positive terminal of the battery pack module, and the second end of the first switch may be connected to the load module. The first end of the second switch is connected to the negative terminal of the battery pack module, and the second end of the second switch may be connected to the load module.

[0098] like Figure 2As shown, the voltage at the end of the first switch connected to the battery pack module is V1, the voltage at the end of the first switch connected to the load module is V2, the voltage at the end of the second switch connected to the battery pack module is V3, and the voltage at the end of the second switch connected to the load module is V4. When the end of the second switch connected to the battery pack module is grounded, i.e., the negative terminal of the battery pack module is grounded, the insulation sampling scheme is a high-voltage ground reference point sampling scheme. When the end of the second switch connected to the battery pack module is not grounded, the insulation detection scheme is a low-voltage high-voltage sampling scheme. The insulation detection method of this embodiment can be applied to both the high-voltage ground reference point sampling scheme and the low-voltage high-voltage sampling scheme.

[0099] In other embodiments, step S103 can be implemented in another way as follows:

[0100] The target sampling voltage is obtained based on the switching states of the first and second switches, and the connection method of the first and second battery packs.

[0101] Figure 4 This is a flowchart illustrating an insulation detection method for different scenarios under a dual-battery pack architecture, as shown below. Figure 4 As shown, the dual-battery pack architecture can include at least the following five scenarios: Scenario 1: High-voltage state in series mode (S0 in series, S1 and S2 closed), enabling periodic diagnosis of the insulation status of the first and second battery packs in series. Scenario 2: High-voltage state in parallel mode (S0 in parallel, S1 and S2 closed), enabling periodic diagnosis of the insulation status of the first and second battery packs in parallel. Scenario 3: Non-high-voltage state in series mode (S0 in series, S1 and S2 open), enabling periodic diagnosis of the low-voltage insulation status of the first and second battery packs in series. Scenario 4: High-voltage state of the first battery pack (S0 in parallel, S1 open, S2 closed), enabling periodic diagnosis of the insulation status of the first battery pack. Scenario 5: High-voltage state of the second battery pack (S0 in parallel, S2 open, S1 closed), enabling periodic diagnosis of the insulation status of the second battery pack. The following description is based on specific embodiments.

[0102] In some embodiments, the target sampling voltage may include a first sampling voltage at the positive terminal of the second battery pack and a second sampling voltage at the negative terminal of the first battery pack. When the connection is in parallel and both the first and second switches are closed, voltages V1 and V2 are equal, and voltages V3 and V4 are equal. In this case, V1 and V3 can be used as voltage sampling points to obtain the first and second sampling voltages, and the insulation state between the positive terminal of the second battery pack and the negative terminal of the first battery pack can be determined based on the first and second sampling voltages.

[0103] For example, refer to Figure 3First, Kp can be closed and Kn opened. After the voltage stabilizes, multiple first sampled voltages of the positive terminal of the second battery pack and multiple second sampled voltages of the negative terminal of the first battery pack can be collected. Based on these first and second sampled voltages, a first set of insulation equations between the positive terminal of the second battery pack and ground can be established. Then, Kp can be opened and Kn closed. After the voltage stabilizes, multiple first sampled voltages of the positive terminal of the second battery pack and multiple second sampled voltages of the negative terminal of the first battery pack can be collected. Based on these first and second sampled voltages, a second set of insulation equations between the negative terminal of the first battery pack and ground can be established. By simultaneously solving the first and second insulation equations, the insulation state between the positive and negative terminals of the second battery pack can be obtained.

[0104] Reference Figure 3 With Kp open and Kn closed, (R2 / / R4 / / Rn) / (R1 / / Rp) = V3 / V1. With Kp closed and Kp open, (R2 / / Rn) / (R1 / / R3 / / Rp) = V3' / V1', and the voltage of the battery pack module Vbatt = V1 + V3 = V1' + V3'. Let V1 / V3 = (Vbatt - V3) / V3 = a, V1' / V3' = (Vbatt - V3') / V3' = b. Since 1 / R2=G2, 1 / R4=G4, 1 / Rn=Gn, 1 / R3=G3, 1 / R1=G1, and 1 / Rp=Gp, according to the Wheatstone bridge principle, we can obtain the first set of insulation equations: (G2+G4+Gn) / (G1+Gp)=a, and the second set of insulation equations: (G2+Gn) / (G1+G3+Gp)=b. Solving the first and second sets of insulation equations simultaneously yields the values ​​of Rp and Rn, where:

[0105]

[0106]

[0107] The insulation state of the positive electrode of the second battery pack can be determined by the Rp value, and the insulation state of the negative electrode of the first battery pack can be determined by the Rn value. For example, a larger Rp value indicates better insulation of the positive electrode of the second battery pack, and a smaller Rp value indicates worse insulation. Similarly, a larger Rn value indicates better insulation of the negative electrode of the first battery pack, and a smaller Rn value indicates worse insulation.

[0108] In this way, under the high-voltage condition of the first and second battery packs connected in parallel, the sampling voltage of the positive terminal of the second battery pack and the negative terminal of the first battery pack can be obtained, thereby enabling the detection of the insulation status at both ends of the battery pack module.

[0109] In other embodiments, the target sampling voltage may include a first sampling voltage at the positive terminal of the second battery pack and a second sampling voltage at the negative terminal of the first battery pack. When the connection method is series connection and both the first and second switches are closed, voltages V1 and V2 are not equal, and voltages V3 and V4 are not equal. In this case, the first and second sampling voltages can be obtained, and the insulation state between the positive terminal of the second battery pack and the negative terminal of the first battery pack can be determined based on the first and second sampling voltages.

[0110] For example, refer to Figure 3 First, Kp can be closed and Kn opened. After the voltage stabilizes, multiple first sampled voltages of the positive terminal of the second battery pack and multiple second sampled voltages of the negative terminal of the first battery pack can be collected. Based on these first and second sampled voltages, a first set of insulation equations between the positive terminal of the second battery pack and ground can be established. Then, Kp can be opened and Kn closed. After the voltage stabilizes, multiple first sampled voltages of the positive terminal of the second battery pack and multiple second sampled voltages of the negative terminal of the first battery pack can be collected. Based on these first and second sampled voltages, a second set of insulation equations between the negative terminal of the first battery pack and ground can be established. By simultaneously solving the first and second insulation equations, the insulation state between the positive and negative terminals of the second battery pack can be obtained.

[0111] In this way, under the high-voltage condition of the first and second battery packs connected in series, the sampling voltage of the positive terminal of the second battery pack and the negative terminal of the first battery pack can be obtained, thereby enabling the detection of the insulation status at both ends of the battery pack module.

[0112] In other embodiments, the target sampling voltage may include a third sampling voltage at the positive terminal of the load module and a fourth sampling voltage at the negative terminal of the load module. When the connection method is series connection and both the first and second switches are open, voltages V1 and V2 are not equal, and voltages V3 and V4 are not equal. In this case, the third and fourth sampling voltages can also be obtained, and the insulation state of the positive and negative terminals of the load module can be determined based on the third and fourth sampling voltages.

[0113] For example, refer to Figure 3First, Kp can be closed and Kn opened. After the voltage stabilizes, multiple third-sample voltages of the positive terminal and multiple fourth-sample voltages of the negative terminal of the load module can be collected. Based on these third-sample and fourth-sample voltages, a set of third insulation equations for the positive terminal of the load module to ground can be established. Then, Kp can be opened and Kn closed. After the voltage stabilizes, multiple third-sample voltages of the positive terminal and multiple fourth-sample voltages of the negative terminal of the load module can be collected. Based on these third-sample and fourth-sample voltages, a set of fourth insulation equations for the load module to ground can be established. By simultaneously solving the third and fourth insulation equations, the insulation state of the positive and negative terminals of the load module can be obtained.

[0114] In this way, under the non-high voltage condition where the first and second battery packs are connected in series, the sampling voltages at both ends of the battery pack and the load can be obtained, thereby enabling the insulation status of both ends of the battery pack module and the load.

[0115] In other embodiments, the target sampling voltage may include a second sampling voltage at the negative terminal of the first battery pack and a third sampling voltage at the positive terminal of the load module. When the first battery pack is connected as a single unit, and the first switch is open and the second switch is closed, voltages V1 and V2 are not equal, while voltages V3 and V4 are equal. In this case, the second and third sampling voltages can be obtained, and the insulation state between the negative terminal of the first battery pack and the positive terminal of the load module can be determined based on these voltages.

[0116] For example, refer to Figure 3 First, Kp can be closed and Kn opened. After the voltage stabilizes, multiple second-sampled voltages of the negative terminal of the first battery pack and multiple third-sampled voltages of the positive terminal of the load module can be collected. Based on these second-sampled and third-sampled voltages, a second set of insulation equations for the negative terminal of the first battery pack to ground can be established. Then, Kp can be opened and Kn closed. After the voltage stabilizes, multiple second-sampled voltages of the negative terminal of the first battery pack and multiple third-sampled voltages of the positive terminal of the load module can be collected. Based on these second-sampled and third-sampled voltages, a third set of insulation equations for the positive terminal of the load module to ground can be established. By simultaneously solving the second and third insulation equations, the insulation state between the negative terminal of the first battery pack and the positive terminal of the load module can be obtained.

[0117] In this way, under the high-voltage condition of the first battery pack being connected as a single unit, the sampling voltages at both ends of the battery pack and the load can be obtained, thereby enabling the detection of the insulation status between the negative terminal of the first battery pack and the positive terminal of the load module.

[0118] In other embodiments, the target sampling voltage may include a first sampling voltage at the positive terminal of the second battery pack and a fourth sampling voltage at the negative terminal of the load module. When the second battery pack is connected as a single unit, and the first switch is closed and the second switch is open, voltages V1 and V2 are equal, while voltages V3 and V4 are not equal. In this case, the first and fourth sampling voltages can be obtained, and the insulation state between the positive terminal of the second battery pack and the negative terminal of the load module can be determined based on these voltages.

[0119] For example, refer to Figure 3 First, Kp can be closed and Kn opened. After the voltage stabilizes, the first sampled voltage of the positive terminal of the second battery pack and the fourth sampled voltage of the negative terminal of the load module can be collected. Based on the multiple first and fourth sampled voltages, a first set of insulation equations between the positive terminal of the second battery pack and ground can be established. Then, Kp can be opened and Kn closed. After the voltage stabilizes, multiple first and fourth sampled voltages can be collected. Based on the multiple first and fourth sampled voltages, a fourth set of insulation equations between the negative terminal of the load module and ground can be established. By simultaneously solving the first and fourth insulation equations, the insulation state between the positive terminal of the second battery pack and the negative terminal of the load module can be obtained.

[0120] In this way, under the high-voltage condition of the second battery pack being connected as a single unit, the insulation state between the negative terminal of the first battery pack and the positive terminal of the load module can be detected, thereby enabling the detection of the insulation state between the negative terminal of the first battery pack and the positive terminal of the load module.

[0121] In summary, this disclosure applies to an insulation detection circuit, which includes a battery pack module, a load module, and a switching assembly. The battery pack module is connected to the load module via the switching assembly. The method includes: acquiring a target sampling voltage based on the switching state of the switching assembly, the target sampling voltage including at least two voltages among the voltages across the battery pack module and the load module. The insulation state of the battery pack module and / or the load module is determined based on the target sampling voltage. The switching assembly in this disclosure can control the connection state of the battery pack module and the load module. Based on different switching states of the switching assembly, sampling voltages at different endpoints of the battery pack module and the load module can be acquired, thereby determining the insulation state of the battery pack module and / or the load module. This method is not limited to insulation detection of the battery pack module, but expands the detection range of insulation detection, improving the safety and reliability of the battery pack.

[0122] Figure 5 This is a block diagram illustrating an insulation detection device according to an exemplary embodiment, applied to... Figure 2 The insulation detection circuit shown includes a battery pack module, a load module, and a switch assembly. The battery pack module is connected to the load module via the switch assembly. The device 200 includes:

[0123] The acquisition module 201 is configured to acquire a target sampling voltage based on the switching state of the switching component. The target sampling voltage includes at least two voltages: the voltage across the battery pack module and the voltage across the load module.

[0124] The determination module 202 is configured to determine the insulation status of the battery pack module and / or load module based on the target sampling voltage.

[0125] In one possible embodiment, the acquisition module 201 is configured to:

[0126] Based on the switching state of the switching components, voltage sampling points are determined from both ends of the battery pack module and the load module.

[0127] The voltage at the voltage sampling point is used as the target sampling voltage.

[0128] In one possible embodiment, the determining module 202 is configured to:

[0129] The insulation status of the voltage sampling point is determined based on the target sampling voltage.

[0130] In one possible embodiment, the battery pack module includes at least one battery pack, and the acquisition module 201 is configured to:

[0131] The target sampling voltage is obtained based on the switching state of the switching component and the connection method of at least one battery pack.

[0132] In one possible embodiment, at least one battery pack module includes a first battery pack and a second battery pack, and the first battery pack and the second battery pack are connected in parallel, in series, or as a single pack.

[0133] In one possible embodiment, the switching assembly includes a first switch and a second switch; a first terminal of the first switch is connected to the positive terminal of the battery pack module, a second terminal of the first switch is connected to the load module, a first terminal of the second switch is connected to the negative terminal of the battery pack module, and a second terminal of the second switch is connected to the load module.

[0134] In one possible embodiment, the acquisition module 201 is configured to:

[0135] The target sampling voltage is obtained based on the switching states of the first and second switches, and the connection method of the first and second battery packs.

[0136] In one possible embodiment, the target sampling voltage includes a first sampling voltage and a second sampling voltage, and the acquisition module 201 is configured to:

[0137] When the access method is series access or parallel access, and both the first switch and the second switch are closed, the first sampling voltage of the positive terminal of the second battery pack and the second sampling voltage of the negative terminal of the first battery pack are obtained.

[0138] In one possible embodiment, the determining module 202 is configured to:

[0139] Based on the first sampling voltage and the second sampling voltage, the insulation state of the positive terminal of the second battery pack and the negative terminal of the first battery pack is determined.

[0140] In one possible embodiment, the target sampling voltage includes a first sampling voltage, a second sampling voltage, a third sampling voltage, and a fourth sampling voltage, and the acquisition module 201 is configured to:

[0141] When the connection method is series connection and the first switch and the second switch are open, the first sampling voltage of the positive terminal of the second battery pack, the second sampling voltage of the negative terminal of the first battery pack, the third sampling voltage of the positive terminal of the load module, and the fourth sampling voltage of the negative terminal of the load module are obtained.

[0142] In one possible embodiment, the determining module 202 is configured to:

[0143] Based on the first sampling voltage and the second sampling voltage, determine the insulation state between the positive terminal of the second battery pack and the negative terminal of the first battery pack;

[0144] Based on the third and fourth sampling voltages, the insulation state of the positive and negative terminals of the load module is determined.

[0145] In one possible embodiment, the target sampling voltage includes a second sampling voltage and a third sampling voltage, and the acquisition module 201 is configured to:

[0146] When the access method is single-pack access of the first battery pack, and the first switch is open and the second switch is closed, the second sampling voltage of the negative terminal of the first battery pack and the third sampling voltage of the positive terminal of the load module are obtained.

[0147] In one possible embodiment, the determining module 202 is configured to:

[0148] Based on the second and third sampling voltages, the insulation state of the negative terminal of the first battery pack and the positive terminal of the load module is determined.

[0149] In one possible embodiment, the target sampling voltage includes a first sampling voltage and a fourth sampling voltage, and the acquisition module 201 is configured to:

[0150] When the access method is single-pack access of the second battery pack, and the first switch is closed and the second switch is open, the first sampling voltage of the positive terminal of the second battery pack and the fourth sampling voltage of the negative terminal of the load module are obtained.

[0151] In one possible embodiment, the determining module 202 is configured to:

[0152] Based on the first and fourth sampling voltages, the insulation state of the positive terminal of the second battery pack and the negative terminal of the load module is determined.

[0153] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0154] In summary, this disclosure applies to an insulation detection circuit, which includes a battery pack module, a load module, and a switching assembly. The battery pack module is connected to the load module via the switching assembly. The method includes: acquiring a target sampling voltage based on the switching state of the switching assembly, the target sampling voltage including at least two voltages among the voltages across the battery pack module and the load module; and determining the insulation state of the battery pack module and / or the load module based on the target sampling voltage. The switching assembly in this disclosure can control the connection state of the battery pack module and the load module. Based on different switching states of the switching assembly, sampling voltages at different endpoints of the battery pack module and the load module can be acquired, thereby determining the insulation state of the battery pack module and / or the load module. This method is not limited to insulation detection of the battery pack module, but expands the detection range of insulation detection, improving the safety and reliability of the battery pack.

[0155] This disclosure also provides a computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the steps of the insulation detection method provided in this disclosure.

[0156] Figure 6 This is a block diagram illustrating an electronic device 800 according to an exemplary embodiment. For example, the electronic device 800 may be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness equipment, personal digital assistant, etc.

[0157] Reference Figure 6 The electronic device 800 may include one or more of the following components: processing component 802, memory 804, power supply component 806, multimedia component 808, audio component 810, input / output interface 812, sensor component 814, and communication component 816.

[0158] Processing component 802 typically controls the overall operation of electronic device 800, such as operations associated with display, telephone calls, data communication, camera operation, and recording. Processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the aforementioned insulation detection method. Furthermore, processing component 802 may include one or more modules to facilitate interaction between processing component 802 and other components. For example, processing component 802 may include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.

[0159] Memory 804 is configured to store various types of data to support the operation of electronic device 800. Examples of such data include instructions for any application or method operating on electronic device 800, contact data, phonebook data, messages, pictures, videos, etc. Memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0160] Power supply component 806 provides power to various components of electronic device 800. Power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 800.

[0161] Multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 808 includes a front-facing camera and / or a rear-facing camera. When the electronic device 800 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0162] Audio component 810 is configured to output and / or input audio signals. For example, audio component 810 includes a microphone (MIC) configured to receive external audio signals when electronic device 800 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 804 or transmitted via communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

[0163] Input / output interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0164] Sensor assembly 814 includes one or more sensors for providing state assessments of various aspects of electronic device 800. For example, sensor assembly 814 can detect the on / off state of electronic device 800, the relative positioning of components such as the display and keypad of electronic device 800, changes in position of electronic device 800 or a component of electronic device 800, the presence or absence of user contact with electronic device 800, orientation or acceleration / deceleration of electronic device 800, and temperature changes of electronic device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 814 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0165] Communication component 816 is configured to facilitate wired or wireless communication between electronic device 800 and other devices. Electronic device 800 can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 816 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0166] In an exemplary embodiment, the electronic device 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described insulation detection method.

[0167] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 804 including instructions, which can be executed by a processor 820 of an electronic device 800 to complete the insulation detection method described above. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0168] In another exemplary embodiment, a computer program product is also provided, the computer program product comprising a computer program executable by a programmable device, the computer program having a code portion for performing the above-described insulation detection method when executed by the programmable device.

[0169] Those skilled in the art will also understand that the various illustrative logical blocks and steps listed in the embodiments of this application can be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented through hardware or software depends on the specific application and the overall system design requirements. Those skilled in the art can implement the described functionality using various methods for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of this application.

[0170] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term “and / or” includes any one of the relevant listed items and any combination of any two or more; similarly, “at least one of…” includes any one of the relevant listed items and any combination of any two or more.

[0171] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0172] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0173] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0174] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0175] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An insulation testing method, characterized in that, This circuit is used for insulation detection and includes a battery pack module, a load module, and a switch assembly. The battery pack module is connected to the load module via the switch assembly. The battery pack module includes at least one battery pack, which in turn includes a first battery pack and a second battery pack. The first and second battery packs can be connected in parallel, in series, or as a single pack. The battery pack module is connected to the load module via a direct charging interface or a DC-Link. The switching assembly includes a first switch and a second switch; a first terminal of the first switch is connected to the positive terminal of the battery pack module, a second terminal of the first switch is connected to the load module, a first terminal of the second switch is connected to the negative terminal of the battery pack module, and a second terminal of the second switch is connected to the load module. The method includes: The target sampling voltage is obtained based on the switching state of the switching component; the target sampling voltage includes at least two of the voltages across the battery pack module and the voltages across the load module. The insulation state of the battery pack module and the load module is determined based on the target sampling voltage; The step of obtaining the target sampling voltage based on the switching state of the switching component includes: The voltage sampling point is determined based on the switching state of the switching component and the connection method of the at least one battery pack; different combinations of switching states and different battery pack connection methods correspond to different voltage sampling points. The target sampling voltage is obtained through the voltage sampling points.

2. The method according to claim 1, characterized in that, The step of obtaining the target sampling voltage based on the switching state of the switching component includes: Based on the switching state of the switching assembly, voltage sampling points are determined from both ends of the battery pack module and both ends of the load module; The voltage at the voltage sampling point is taken as the target sampling voltage.

3. The method according to claim 2, characterized in that, Determining the insulation state of the battery pack module and the load module based on the target sampling voltage includes: The insulation state of the voltage sampling point is determined based on the target sampling voltage.

4. The method according to claim 1, characterized in that, The step of obtaining the target sampling voltage based on the switching state of the switching component and the connection method of the at least one battery pack includes: The target sampling voltage is obtained based on the switching states of the first and second switches, and the connection method of the first and second battery packs.

5. The method according to claim 4, characterized in that, The target sampling voltage includes a first sampling voltage at the positive terminal of the second battery pack and a second sampling voltage at the negative terminal of the first battery pack; obtaining the target sampling voltage based on the switching states of the first and second switches, and the connection method of the first and second battery packs, includes: When the access method is series access or parallel access, and both the first switch and the second switch are closed, the first sampling voltage and the second sampling voltage are obtained.

6. The method according to claim 5, characterized in that, Determining the insulation state of the battery pack module and the load module based on the target sampling voltage includes: Based on the first sampling voltage and the second sampling voltage, the insulation state of the positive terminal of the second battery pack and the negative terminal of the first battery pack is determined.

7. The method according to claim 4, characterized in that, The target sampling voltage includes: a first sampling voltage at the positive terminal of the second battery pack, a second sampling voltage at the negative terminal of the first battery pack, a third sampling voltage at the positive terminal of the load module, and a fourth sampling voltage at the negative terminal of the load module; obtaining the target sampling voltage based on the switching states of the first switch and the second switch, and the connection method of the first battery pack and the second battery pack includes: When the access method is series access and the first switch and the second switch are open, the first sampling voltage, the second sampling voltage, the third sampling voltage and the fourth sampling voltage are obtained.

8. The method according to claim 7, characterized in that, Determining the insulation state of the battery pack module and the load module based on the target sampling voltage includes: Based on the first sampling voltage and the second sampling voltage, determine the insulation state of the positive terminal of the second battery pack and the negative terminal of the first battery pack; The insulation state of the positive and negative terminals of the load module is determined based on the third and fourth sampling voltages.

9. The method according to claim 4, characterized in that, The target sampling voltage includes: a second sampling voltage at the negative terminal of the first battery pack, and a third sampling voltage at the positive terminal of the load module; obtaining the target sampling voltage based on the switching states of the first switch and the second switch, and the connection method of the first battery pack and the second battery pack includes: When the access method is that the first battery pack is connected as a single pack, and the first switch is open and the second switch is closed, the second sampling voltage and the third sampling voltage are obtained.

10. The method according to claim 9, characterized in that, Determining the insulation state of the battery pack module and the load module based on the target sampling voltage includes: Based on the second sampling voltage and the third sampling voltage, the insulation state between the negative terminal of the first battery pack and the positive terminal of the load module is determined.

11. The method according to claim 4, characterized in that, The target sampling voltage includes: a first sampling voltage at the positive terminal of the second battery pack, and a fourth sampling voltage at the negative terminal of the load module; obtaining the target sampling voltage based on the switching states of the first switch and the second switch, and the connection method of the first battery pack and the second battery pack includes: When the access method is the second battery pack single-pack access, and the first switch is closed and the second switch is open, the first sampling voltage and the fourth sampling voltage are obtained.

12. The method according to claim 11, characterized in that, Determining the insulation state of the battery pack module and the load module based on the target sampling voltage includes: Based on the first sampling voltage and the fourth sampling voltage, the insulation state between the positive terminal of the second battery pack and the negative terminal of the load module is determined.

13. An insulation testing device, characterized in that, This circuit is used for insulation detection and includes a battery pack module, a load module, and a switch assembly. The battery pack module is connected to the load module via the switch assembly. The battery pack module includes at least one battery pack, which in turn includes a first battery pack and a second battery pack. The first and second battery packs can be connected in parallel, in series, or as a single pack. The battery pack module is connected to the load module via a direct charging interface or a DC-Link. The switching assembly includes a first switch and a second switch; a first terminal of the first switch is connected to the positive terminal of the battery pack module, a second terminal of the first switch is connected to the load module, a first terminal of the second switch is connected to the negative terminal of the battery pack module, and a second terminal of the second switch is connected to the load module. The device includes: The acquisition module is configured to acquire a target sampling voltage based on the switching state of the switching component; the target sampling voltage includes at least two voltages, namely the voltage across the battery pack module and the voltage across the load module. The determination module is configured to determine the insulation state of the battery pack module and the load module based on the target sampling voltage; The acquisition module is configured as follows: The voltage sampling point is determined based on the switching state of the switching component and the connection method of the at least one battery pack; different combinations of switching states and different battery pack connection methods correspond to different voltage sampling points. The target sampling voltage is obtained through the voltage sampling points.

14. The apparatus according to claim 13, characterized in that, The acquisition module is configured as follows: Based on the switching state of the switching assembly, voltage sampling points are determined from both ends of the battery pack module and both ends of the load module; The voltage at the voltage sampling point is taken as the target sampling voltage.

15. The apparatus according to claim 13, characterized in that, The determining module is configured as follows: The insulation state of the voltage sampling point is determined based on the target sampling voltage.

16. The apparatus according to claim 13, characterized in that, The acquisition module is configured as follows: The target sampling voltage is obtained based on the switching states of the first and second switches, and the connection method of the first and second battery packs.

17. An electronic device, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured to execute processor-executable instructions in the memory to implement the steps of the method according to any one of claims 1-12.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method described in any one of claims 1-12.

19. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1-12.

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