Insulation state monitoring circuit testing device and energy storage system

Abstract

The utility model discloses an insulation state monitoring circuit testing device and an energy storage system, and belongs to the technical field of insulation monitoring. The insulation state monitoring circuit testing device comprises at least one first module, and the first module comprises a first resistor and a first switch which are connected in series; a first port of the first module is used for being connected with a target interface of a to-be-tested battery pack, and a second port of the first module is used for being connected with a grounding end of the to-be-tested battery pack; and the processing module is electrically connected with each first module and the battery pack to be detected, and the processing module is used for determining the working state corresponding to the insulation state monitoring circuit based on the received actual resistance value corresponding to the first resistor and the target resistance value corresponding to the first resistor. The insulation state monitoring circuit testing device is simple in structure and easy to operate, the cost of testing equipment is reduced, and the testing flexibility is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of insulation monitoring, and in particular, relates to an insulation status monitoring circuit testing device and an energy storage system. Background Art

[0002] The safety risks related to "electricity" in the electronic and electrical systems inside the battery pack of the energy storage system must be paid attention to at all times. During the offline monitoring of the battery pack, the test link involving "insulation status monitoring" is particularly important. The test equipment used in the relevant technology has complex functions, high equipment costs, complex operations and poor flexibility in batch testing. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an insulation state monitoring circuit test device and an energy storage system, which has a simple structure and is easy to operate, reduces the cost of the test equipment, and improves the test flexibility.

[0004] In a first aspect, the present application provides an insulation status monitoring circuit testing device, the device comprising:

[0005] At least one first module, the first module comprising a first resistor and a first switch connected in series; a first port of the first module is used to connect to a target interface of a battery pack to be tested, and a second port of the first module is used to connect to a ground terminal of the battery pack to be tested;

[0006] A processing module, wherein the processing module is electrically connected to each of the first modules and the battery pack to be tested, and the processing module is used to determine the working state corresponding to the insulation state monitoring circuit based on the actual resistance value corresponding to the first resistor received and the target resistance value corresponding to the first resistor.

[0007] According to the insulation status monitoring circuit testing device of the present application, by setting a first resistor and a first switch in a first module, and connecting the first module to the target interface of the battery pack to be tested, the working state of the insulation status monitoring circuit is determined based on the actual resistance value of the first resistor received by the processing module and the target resistance value. The device structure is simple and easy to operate, which reduces the cost of testing equipment and improves testing flexibility.

[0008] According to the insulation state monitoring circuit testing device of the present application, the target interface includes a positive electrode interface and a negative electrode interface, and the first port can be selectively connected to one of the positive electrode interface and the negative electrode interface.

[0009] According to the insulation status monitoring circuit testing device of the present application, in the case where there are multiple first modules, the first port included in at least some of the multiple first modules is used to connect to the positive electrode interface, and the first port included in the remaining first modules is used to connect to the negative electrode interface; the remaining first modules are other modules among the multiple first modules except at least some of the first modules.

[0010] The insulation state monitoring circuit testing device according to the present application further includes a second switch, the second switch has a built-in interlocking structure, and the second switch is arranged between the target interface and the first port.

[0011] According to the insulation status monitoring circuit testing device of the present application, the target interface includes a positive electrode interface and a negative electrode interface, the second switch includes a first sub-switch and a second sub-switch, the first sub-switch is arranged between the first port and the positive electrode interface, and the second sub-switch is arranged between the first port and the negative electrode interface; and when the first sub-switch is closed, the second sub-switch remains open; when the second sub-switch is closed, the first sub-switch remains open.

[0012] According to the insulation status monitoring circuit testing device of the present application, when there are multiple first modules, when any one of the multiple first switches corresponding to the multiple first modules is closed, the other switches remain open; the other switches are all the switches among the multiple first switches except any one of the switches.

[0013] The insulation state monitoring circuit test device according to the present application further includes at least one fuse, which is arranged between the first port and the target interface. When a short circuit occurs in the insulation state monitoring circuit test device, the fuse is disconnected.

[0014] The insulation state monitoring circuit testing device according to the present application further includes a display device, and the display device is electrically connected to the processing module.

[0015] According to the insulation status monitoring circuit testing device of the present application, the processing module and the battery pack to be tested are connected via a CAN communication bus.

[0016] According to the insulation state monitoring circuit testing device of the present application, the processing module includes:

[0017] A subtractor, wherein an input end of the subtractor receives the actual resistance value and the target resistance value respectively;

[0018] A comparator, wherein a first input terminal of the comparator is connected to the output terminal of the subtractor, and a second input terminal of the comparator is used to input a target threshold value.

[0019] In a second aspect, the present application provides an energy storage system, comprising:

[0020] Battery pack;

[0021] As described in any one of the first aspects, the insulation state monitoring circuit testing device is connected to the battery pack.

[0022] According to the energy storage system of the present application, by electrically connecting the battery pack to the insulation state monitoring circuit test device, setting a first resistor and a first switch in the first module of the insulation state monitoring circuit test device, and connecting the first module to the target interface of the battery pack to be tested, the working state of the insulation state monitoring circuit is determined based on the actual resistance value of the first resistor received by the processing module and the target resistance value. The device structure is simple and easy to operate, which reduces the cost of test equipment and improves test flexibility.

[0023] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0024] By setting a first resistor and a first switch in the first module and connecting the first module to the target interface of the battery pack to be tested, the working state of the insulation state monitoring circuit is determined based on the actual resistance value of the first resistor received by the processing module and the target resistance value. The device structure is simple and easy to operate, which reduces the cost of test equipment and improves test flexibility.

[0025] Furthermore, by setting up multiple first modules and grouping the multiple first modules, the first ports of at least some of the first modules are connected to the positive electrode interface, and the first ports of the remaining first modules are connected to the negative electrode interface. By switching on and off different first resistors, testing is performed to improve the accuracy of the test.

[0026] Furthermore, by setting a second switch including a first sub-switch and a second sub-switch, the number of first modules is reduced, thereby reducing equipment costs; in addition, the positive electrode interface and the negative electrode interface of the battery pack to be tested can share a group of first modules, thereby reducing the test result error caused by the resistance error between first resistors of the same specification, thereby improving test efficiency.

[0027] Furthermore, by setting a subtractor and a comparator, the target resistance value corresponding to the first resistor read by the processing module and the actual resistance value corresponding to the first resistor are input into the subtractor to obtain the difference between the two, and the difference is input into the comparator to compare it with the target threshold to obtain the test result. The operation is simple, the execution logic is simple, and the equipment cost is low.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 It is one of the structural schematic diagrams of the insulation state monitoring circuit test device provided in the embodiment of the present application;

[0031] Figure 2 This is the second structural schematic diagram of the insulation state monitoring circuit test device provided in the embodiment of the present application;

[0032] Reference numerals: battery pack to be tested 110; first module 120; display device 130; processing module 140;

[0033] First port 150; second port 160; positive electrode interface PACK+; negative electrode interface PACK-;

[0034] Ground terminal PACKGND; fuse FU; second switch S7; first sub-switch S8; second sub-switch S9. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0036] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0037] 1. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0038] 2. In the description of this application, “plurality” means two or more.

[0039] The insulation state monitoring circuit testing device provided in the embodiment of the present application is described in detail below through specific embodiments and application scenarios in conjunction with the accompanying drawings.

[0040] like Figure 1 As shown, the insulation state monitoring circuit testing device includes: at least one first module 120 and a processing module 140.

[0041] In some embodiments, the first module 120 includes a first resistor and a first switch connected in series.

[0042] Among them, the first resistor is a reference resistor, and the resistance value of the first resistor can be determined according to the threshold value of the insulation monitoring alarm of the battery pack 110 to be tested, which is not limited in this application.

[0043] The first switch is used for switching the first resistor to be measured.

[0044] When the first resistor corresponding to the first switch needs to be switched, the first switch is closed.

[0045] When there is no need to switch the first resistor corresponding to the first switch, the first switch remains open.

[0046] The first port 150 of the first module 120 is used to connect to the target interface of the battery pack 110 to be tested, and the second port 160 of the first module 120 is used to connect to the ground terminal PACK GND of the battery pack 110 to be tested.

[0047] The target interface is one of the positive interface PACK+ or the negative interface PACK- of the battery pack 110 to be tested.

[0048] The first port 150 of the first module may be connected to only one of the positive electrode interface PACK+ and the negative electrode interface PACK-, or may be connected to both the positive electrode interface PACK+ and the negative electrode interface PACK-.

[0049] The processing module 140 is electrically connected to each of the first modules 120 and the battery pack 110 to be tested.

[0050] The processing module 140 is used to determine the insulation state of the battery pack 110 to be tested based on the received actual resistance value corresponding to the first resistor and the target resistance value corresponding to the first resistor.

[0051] The target resistance is a value corresponding to the resistance parameter of the first resistor.

[0052] The actual resistance value is the value of the first resistor obtained in real time during the test of the insulation state monitoring circuit.

[0053] According to the insulation status monitoring circuit testing device provided in the embodiment of the present application, by setting a first resistor and a first switch in the first module 120, and connecting the first module 120 to the target interface of the battery pack 110 to be tested, the working state of the insulation status monitoring circuit is determined based on the target resistance value and the actual resistance value of the first resistor received by the processing module 140. The device structure is simple and easy to operate, which reduces the cost of testing equipment and improves testing flexibility.

[0054] The following describes the connection method between the first port 150 and the target interface.

[0055] First, the first port 150 is connected to only one of the positive electrode interface PACK+ or the negative electrode interface PACK-

[0056] In some embodiments, the target interface includes a positive interface PACK+ and a negative interface PACK-, and the first port 150 can be selectively connected to one of the positive interface PACK+ and the negative interface PACK-.

[0057] Continue to refer Figure 1 When the target interface is the positive interface PACK+, the first port 150 of the first module 120 is connected to the positive interface PACK+, the first port 150 is connected to the first resistor in the first module 120, the first resistor is connected to the first switch, and the second port 160 of the first module 120 is connected to the ground terminal PACK GND of the battery pack 110 to be tested.

[0058] In some embodiments, when there are multiple first modules 120, the first ports 150 included in at least some of the multiple first modules 120 are used to connect to the positive interface PACK+, and the first ports 150 included in the remaining first modules 120 are used to connect to the negative interface PACK-; the remaining first modules 120 are other modules among the multiple first modules 120 except at least some of the first modules 120.

[0059] In this embodiment, a plurality of first modules 120 may be connected in parallel.

[0060] Continue to refer Figure 1 The multiple first modules 120 include: a first module 120 corresponding to the first resistor R1, a first module 120 corresponding to the first resistor R2, a first module 120 corresponding to the first resistor R3, a first module 120 corresponding to the first resistor R4, a first module 120 corresponding to the first resistor R5 and a first module 120 corresponding to the first resistor R6.

[0061] Among them, the first module 120 corresponding to the first resistor R4, the first module 120 corresponding to the first resistor R5 and the first module 120 corresponding to the first resistor R6 are connected to the positive electrode interface PACK+ of the battery pack 110 to be tested; the first module 120 corresponding to the first resistor R1, the first module 120 corresponding to the first resistor R2 and the first module 120 corresponding to the first resistor R3 are connected to the negative electrode interface PACK- of the battery pack 110 to be tested.

[0062] According to the insulation status monitoring circuit testing device provided in the embodiment of the present application, by setting a plurality of first modules 120 and grouping the plurality of first modules 120, the first ports 150 of at least some of the first modules 120 are connected to the positive electrode interface PACK+, and the first ports 150 of the remaining first modules 120 are connected to the negative electrode interface PACK-, and testing is performed by switching on and off different first resistors, thereby improving the accuracy of the test.

[0063] Second, the first port 150 is connected to both the positive electrode interface PACK+ and the negative electrode interface PACK-

[0064] In some embodiments, the insulation state monitoring circuit testing device further includes a second switch S7.

[0065] In this embodiment, the second switch S7 has a built-in interlocking structure.

[0066] like Figure 2 As shown, in some embodiments, the second switch S7 includes a first sub-switch S8 and a second sub-switch S9.

[0067] In this embodiment, based on the interlocking structure built into the second switch S7, when the first sub-switch S8 is closed, the second sub-switch S9 is opened.

[0068] When the second sub-switch S9 is closed, the first sub-switch S8 is open.

[0069] The first sub-switch S8 is disposed between the first port 150 and the positive electrode interface PACK+, and the second sub-switch S9 is disposed between the first port 150 and the negative electrode interface PACK-.

[0070] According to the insulation status monitoring circuit test device provided in the embodiment of the present application, by setting the second switch S7 and setting an interlocking structure between the first sub-switch S8 and the second sub-switch S9 of the second switch S7, only one of the first sub-switch S8 and the second sub-switch S9 can be turned on at the same time, and the positive interface PACK+ and the negative interface PACK- are controlled to share a group of first modules 120, thereby reducing the number of first modules 120 set and reducing equipment costs.

[0071] Continue to refer Figure 2 One end of the first sub-switch S8 is connected to the first port 150, and the other end of the first sub-switch S8 is connected to the positive electrode interface PACK+, one end of the second sub-switch S9 is connected to the first port 150, and the other end of the first sub-switch S8 is connected to the negative electrode interface PACK-.

[0072] In some embodiments, the target interface includes a positive interface PACK+ and a negative interface PACK-, and when the first sub-switch S8 is closed, the second sub-switch S9 remains open; when the second sub-switch S9 is closed, the first sub-switch S8 remains open.

[0073] In this embodiment, the state of the first sub-switch S8 changes based on the change of the state of the second sub-switch S9. Of course, based on the interlocking structure built into the second switch S7, the state of the second sub-switch S9 also changes based on the change of the state of the first sub-switch S8.

[0074] When the insulation status monitoring circuit test is performed between the positive electrode interface PACK+ of the battery pack 110 to be tested and the ground terminal PACK GND of the battery pack 110 to be tested, the first sub-switch S8 is closed and the state of the second sub-switch S9 should be open.

[0075] When the insulation status monitoring circuit test is performed by connecting the negative electrode interface PACK- of the battery pack 110 to the ground terminal PACK GND of the battery pack 110 to be tested, the second sub-switch S9 is closed, and the state of the first sub-switch S8 should be open.

[0076] According to the insulation status monitoring circuit test device provided in the embodiment of the present application, by setting a second switch S7 including a first sub-switch S8 and a second sub-switch S9, the number of first modules 120 is reduced, so that the positive electrode interface PACK+ and the negative electrode interface PACK- of the battery pack 110 to be tested share a group of first modules 120, thereby reducing the test result error caused by the resistance error between first resistors of the same specification and improving the test efficiency.

[0077] In some embodiments, when there are multiple first modules 120, when any one of the multiple first switches corresponding to the multiple first modules 120 is closed, the other switches remain open; the other switches are all switches except any one of the multiple first switches.

[0078] In this embodiment, the multiple first switches corresponding to the multiple first modules 120 are interlocked through hardware wiring, and only one of the multiple first switches can be closed at the same time.

[0079] The closing signals of each first switch inside the processing module 140 are interlocked. During the test, only one closing signal is allowed to be sent, so that only one of the multiple first switches can be closed at the same time.

[0080] Continue to refer Figure 1 In the case where the insulation monitoring circuit between the positive electrode interface PACK+ of the battery pack 110 to be tested and the ground terminal PACKGND of the battery pack 110 to be tested needs to be put into operation and the first resistor R4 is required, at this time, the first switch S4 is closed, and the first switch S1, the first switch S2, the first switch S3, the first switch S5 and the first switch S6 remain open.

[0081] When the insulation status monitoring circuit test is performed between the negative electrode interface PACK- of the battery pack 110 to be tested and the ground terminal PACK GND of the battery pack 110 to be tested and the first resistor R1 needs to be put into operation, at this time, the first switch S1 is closed, and the first switch S2, the first switch S3, the first switch S4, the first switch S5 and the first switch S6 remain open.

[0082] In some embodiments, the processing module 140 is connected to the battery pack to be tested 110 via a CAN communication bus.

[0083] In this embodiment, the processing module 140 may perform CAN communication.

[0084] Based on the communication protocol of the CAN communication bus, a data frame of a target resistance value of the first resistor is defined and an actual resistance value of the first resistor is analyzed.

[0085] The execution logic of the insulation condition monitoring circuit test device is described below.

[0086] When the negative electrode interface PACK- of the battery pack 110 to be tested is connected to the ground terminal PACK GND of the battery pack 110 to be tested for insulation status monitoring circuit testing and the first resistor R1 needs to be put into operation, the processing module 140 sends an instruction to close the first switch S1, so that the negative electrode interface PACK- of the battery pack 110 to be tested is connected to the ground terminal PACK GND of the battery pack 110 to be tested through the first resistor R1. At this time, the processing module 140 reads the data frame of the actual resistance value of the first resistor of the CAN communication of the battery pack 110 to be tested and parses its corresponding resistance value, determines the difference between the parsed resistance value and the pre-defined target resistance value of the first resistor, and determines whether the insulation status monitoring circuit of the battery pack 110 to be tested is normal based on the difference and the target threshold value.

[0087] When the first port 150 is connected to both the positive interface PACK+ and the negative interface PACK- to perform an insulation status monitoring circuit test, and when it is necessary to test the first resistor R1 corresponding to the positive interface PACK+, the processing module 140 sends an instruction to close the first sub-switch S8 and the first switch S1, so that the positive interface PACK+ of the battery pack 110 to be tested is connected to the ground terminal PACK GND of the battery pack 110 to be tested through the first resistor R1. At this time, the processing module 140 reads the data frame of the actual resistance value of the first resistor of the CAN communication of the battery pack 110 to be tested and parses its corresponding resistance value, determines the difference between the parsed resistance value and the pre-defined target resistance value of the first resistor, and determines whether the insulation status monitoring circuit of the battery pack 110 to be tested is normal based on the difference and the target threshold value.

[0088] Among them, the target threshold can be determined based on actual conditions and is not limited in this application.

[0089] According to the insulation status monitoring circuit testing device provided in the embodiment of the present application, a CAN communication bus is set between the processing module 140 and the battery pack 110 to be tested, and a data frame corresponding to the first resistor is defined based on the CAN communication protocol, which is flexible and highly compatible.

[0090] In some embodiments, the processing module 140 includes a subtractor and a comparator.

[0091] In this embodiment, the input terminals of the subtractor receive the actual resistance value and the target resistance value respectively.

[0092] A first input terminal of the comparator is connected to the output terminal of the subtractor, and a second input terminal of the comparator is used to input a target threshold value.

[0093] The execution logic of the insulation condition monitoring circuit test device is described below.

[0094] When the processing module 140 reads the data frame of the actual resistance value corresponding to the first resistor through CAN communication and parses it into its corresponding resistance value, the actual resistance value corresponding to the first resistor and the target resistance value of the first resistor are input into a subtractor, and the subtractor performs a subtraction operation on the target resistance value of the first resistor and the actual resistance value of the first resistor to obtain the difference between the target resistance value of the first resistor and the actual resistance value of the first resistor, and then inputs the difference into a comparator to determine the insulation status monitoring circuit of the battery pack 110 to be tested based on the target threshold value pre-input at the second input terminal.

[0095] In actual implementation, the difference may be the absolute value after the subtraction operation.

[0096] When the difference is smaller than the target threshold, it is determined that the insulation status monitoring circuit of the battery pack 110 to be tested is normal.

[0097] When the difference is not less than the target threshold, it is determined that the insulation state monitoring circuit of the battery pack 110 to be tested is abnormal.

[0098] According to the insulation status monitoring circuit testing device provided in the embodiment of the present application, by setting a subtractor and a comparator, the actual resistance value corresponding to the first resistor read by the processing module 140 and the target resistance value corresponding to the first resistor are input into the subtractor to obtain the difference between the two, and the difference is input into the comparator to compare it with the target threshold value to obtain the test result. The operation is simple, the execution logic is simple, and the equipment cost is low.

[0099] In some embodiments, the insulation status monitoring circuit testing device may further include at least one fuse FU.

[0100] In this embodiment, the fuse FU is disposed between the first port 150 and the target interface.

[0101] Fuse FU is used to protect the internal circuit of the insulation condition monitoring circuit test device.

[0102] In the case where the first port 150 is connected to only one of the positive electrode port PACK+ or the negative electrode port PACK−, the fuse FU may be connected to the first port 150 .

[0103] When the first port 150 is connected to both the positive interface PACK+ and the negative interface PACK-, the fuse FU can be connected to the second switch S7; when the first module 120 is connected to the positive interface PACK+, the fuse FU is connected to the first sub-switch S8; when the first module 120 is connected to the negative interface PACK-, the fuse FU is connected to the second sub-switch S9.

[0104] For example, in the event of a short circuit in the insulation condition monitoring circuit test device, the fuse FU opens.

[0105] According to the insulation state monitoring circuit testing device provided in the embodiment of the present application, by setting a fuse FU between the first port 150 and the target interface, the safety of the insulation state monitoring circuit is effectively guaranteed and the test risk is reduced.

[0106] In some embodiments, the insulation status monitoring circuit testing device may further include a display device 130 .

[0107] In this embodiment, the display device 130 is electrically connected to the processing module 140 .

[0108] The display device 130 is a device for displaying information related to the test result.

[0109] The information may include: the actual resistance value of the first resistor, the target resistance value of the first resistor, the difference between the target resistance value and the actual resistance value of the first resistor, whether the insulation status monitoring circuit of the battery pack 110 to be tested is normal or whether the insulation status monitoring circuit of the battery pack 110 to be tested is abnormal.

[0110] According to the insulation status monitoring circuit testing device provided in the embodiment of the present application, the display device 130 is provided to output the test results, which is simple and intuitive, thereby improving the user experience.

[0111] The present application also provides an energy storage system, comprising: a battery pack and an insulation status monitoring circuit testing device as described in any of the above embodiments.

[0112] In this embodiment, the battery pack is electrically connected to the insulation state monitoring circuit test device. According to the energy storage system provided in the embodiment of the present application, by electrically connecting the battery pack to the insulation state monitoring circuit test device, setting a first resistor and a first switch in the first module 120 of the insulation state monitoring circuit test device, and controlling the closing and opening of the first resistor by the processing module 140, the insulation state monitoring circuit of the battery pack 110 to be tested is tested, the device structure is simple and easy to operate, the test equipment cost is reduced, and the test flexibility is improved.

[0113] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0115] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An insulation status monitoring circuit test device, characterized in that: include: at least one first module, the first module comprising a first resistor and a first switch connected in series; The first port of the first module is used to connect to the target interface of the battery pack to be tested, and the second port of the first module is used to connect to the ground terminal of the battery pack to be tested; A processing module, wherein the processing module is electrically connected to each of the first modules and the battery pack to be tested, and the processing module is used to determine the working state corresponding to the insulation state monitoring circuit based on the actual resistance value corresponding to the first resistor received and the target resistance value corresponding to the first resistor.

2. The insulation state monitoring circuit testing device according to claim 1, characterized in that: The target interface includes a positive electrode interface and a negative electrode interface, and the first port can be selectively connected to one of the positive electrode interface and the negative electrode interface.

3. The insulation state monitoring circuit testing device according to claim 2, characterized in that: In the case where there are multiple first modules, the first port included in at least some of the multiple first modules is used to connect to the positive electrode interface, and the first port included in the remaining first modules is used to connect to the negative electrode interface; the remaining first modules are other modules among the multiple first modules except at least some of the first modules.

4. The insulation state monitoring circuit testing device according to any one of claims 1 to 3, characterized in that: The device further includes a second switch, wherein the second switch has a built-in interlocking structure and is disposed between the target interface and the first port.

5. The insulation state monitoring circuit testing device according to claim 4, characterized in that: The target interface includes a positive interface and a negative interface, and the second switch includes a first sub-switch and a second sub-switch, the first sub-switch is arranged between the first port and the positive interface, and the second sub-switch is arranged between the first port and the negative interface; and when the first sub-switch is closed, the second sub-switch remains open; when the second sub-switch is closed, the first sub-switch remains open.

6. The insulation state monitoring circuit testing device according to any one of claims 1 to 3, characterized in that: In the case where there are multiple first modules, when any one of the multiple first switches corresponding to the multiple first modules is closed, the other switches remain open; the other switches are all switches among the multiple first switches except the any one switch.

7. The insulation state monitoring circuit testing device according to any one of claims 1 to 3, characterized in that: It also includes at least one fuse, which is arranged between the first port and the target interface. When a short circuit occurs in the insulation state monitoring circuit testing device, the fuse is disconnected.

8. The insulation state monitoring circuit testing device according to any one of claims 1 to 3, characterized in that: It also includes a display device, which is electrically connected to the processing module.

9. The insulation state monitoring circuit testing device according to any one of claims 1 to 3, characterized in that: The processing module is connected to the battery pack to be tested via a CAN communication bus.

10. The insulation state monitoring circuit testing device according to any one of claims 1 to 3, characterized in that: The processing module comprises: A subtractor, wherein an input end of the subtractor receives the actual resistance value and the target resistance value respectively; A comparator, wherein a first input terminal of the comparator is connected to the output terminal of the subtractor, and a second input terminal of the comparator is used to input a target threshold value.

11. An energy storage system, characterized in that: include: Battery pack; The insulation state monitoring circuit testing device according to any one of claims 1 to 10, wherein the insulation state monitoring circuit testing device is connected to the battery pack.

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