Battery pack connection reliability detection method, device, equipment and medium

Abstract

The invention provides a battery pack connection reliability detection method, device and equipment and a medium, and the device comprises an upper computer and a plurality of voltage drop collection devices controlled by the upper computer. The voltage drop acquisition device is connected with the two ends of the electric connecting piece so as to acquire the voltage drop of the two ends of the electric connecting piece; the voltage drop acquisition device is used for uploading the acquired voltage drop to the upper computer; the relay box comprises a plurality of voltage drop relays, and the voltage drop relays are connected with the electric connecting pieces in a one-to-one correspondence mode and connected in a loop of the voltage drop collecting device and the electric connecting pieces in series. The beneficial effects of the invention are that the voltage drop acquisition device is connected with the two ends of the electric connector to acquire the voltage drop at the two ends of the electric connector, so that the electric connectors are detected one by one without the need of manually holding the device, time resources and manpower resources are saved, and the accuracy, precision and safety are improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular to a method, device, equipment and medium for detecting the connection reliability of a battery pack. Background Art

[0002] At present, the application of high-current charging technology in the new energy industry is becoming more and more widespread. The larger current puts forward more stringent requirements on the working stability of the PACK, which means that the electrical connection status of the PACK needs an accurate, effective and comprehensive detection method to better ensure that the PACK does not overheat and the electrical connection stability. Existing technologies such as impedance testing methods and the use of feeler gauges to detect bolt tightening methods require manual handheld equipment to detect each electrical connector one by one, which is time-consuming and labor-intensive, and the accuracy, precision and safety are not easy to guarantee. Summary of the invention

[0003] The main purpose of the present invention is to provide a method, device, equipment and medium for detecting the reliability of battery pack connection, aiming to solve the problem that the detection of electrical connectors is time-consuming and has poor accuracy.

[0004] The present invention provides a battery pack connection reliability detection device, which is used to detect the connection reliability of each electrical connector in a battery system, wherein the battery system uses an overcurrent method to supply power to each of the electrical connectors, including:

[0005] A relay box, a host computer, and a plurality of voltage drop acquisition devices controlled by the host computer;

[0006] The voltage drop collection device is connected to both ends of the electrical connector to obtain the voltage drop at both ends of the electrical connector;

[0007] The pressure drop collection device is used to upload the collected pressure drop to the host computer;

[0008] The relay box includes a plurality of voltage drop relays, which are connected to the electrical connectors one by one and are connected in series in the circuit between the voltage drop collection device and the electrical connector to control the on-off of the circuit between the voltage drop collection device and the electrical connector.

[0009] Furthermore, the battery system includes a plurality of high-voltage circuits and a high-voltage distribution box;

[0010] The high-voltage distribution box is connected to the host computer, and the host computer controls the on and off of the relay in the high-voltage distribution box so that the battery system switches to different high-voltage circuits to put the electrical connector in different overcurrent states.

[0011] Further, it also includes a lower detection tooling;

[0012] The lower detection tooling includes at least one group of detection components, the detection component includes a fixed end and a movable end, the fixed end and the movable end are slidably connected, one end of the voltage drop collection device is connected to the movable end of the detection component, one end of the electrical connector is connected to the movable end of the detection component, and the other end is connected to the other end of the voltage drop collection device, so that the voltage drop collection device can collect the voltage at both ends of the electrical connector.

[0013] Furthermore, the voltage drop acquisition device is a data acquisition card.

[0014] Furthermore, it also includes a charging and discharging cabinet, which is connected to the battery system and is used to discharge the battery system so that the electrical connector is in an overcurrent state.

[0015] Furthermore, the relay box is connected to the host computer and is controlled by the host computer.

[0016] The present invention also provides a method for detecting the connection reliability of a battery pack, comprising:

[0017] Connecting the battery system to an external device for discharging;

[0018] Controlling the on and off of each relay in the relay box;

[0019] The voltage drop data of each electrical connector in the overcurrent state is collected in sequence by a voltage drop collection device;

[0020] Whether the battery connection is reliable is determined according to the voltage drop data.

[0021] Furthermore, the step of judging whether the battery connection is reliable according to the voltage drop data includes:

[0022] Determining whether the pressure drop data is within a preset range;

[0023] If it is within the preset range, it is determined that the battery connection is reliable.

[0024] Furthermore, each electrical connector is tested multiple times to obtain multiple voltage drop data corresponding to each electrical connector, and the step of judging whether the battery connection is reliable according to the voltage drop data includes:

[0025] Determining whether the pressure drop data is within a preset range;

[0026] If it is within the preset range, the characteristic vector X of each electrical connector is calculated. i =

[0027] {(Q q，q-1 ), (Q q，q-2 ),...,(Q q，z)..., (Q q，2 ), (Q q，1 )}, where q represents the qth measurement, X i represents the characteristic vector of the i-th electrical connector, (Q q，z ) represents the rate of change of data between the qth measurement and the zth measurement, q, z, i are positive integers, and q>z;

[0028] Calculating the modulus of the eigenvector;

[0029] Determining whether the modulus value is within a preset modulus value range;

[0030] If it is within the preset module value range, it is determined that the battery connection is reliable.

[0031] Furthermore, before the step of connecting the battery system to an external device for discharging, the method further includes:

[0032] The connection state of the electrical connector is adjusted to perform voltage drop tests on the electrical connector in different connection states.

[0033] The present invention also provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any one of the above methods when executing the computer program.

[0034] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of any of the above-mentioned methods are implemented.

[0035] The beneficial effects of the present invention are as follows: by connecting the voltage drop acquisition device to the two ends of the electrical connector to obtain the voltage drop at the two ends of the electrical connector, there is no need for manual handheld equipment to detect each electrical connector one by one, which saves time and human resources and also improves accuracy, precision and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the connection structure of a battery pack connection reliability detection device according to an embodiment of the present invention;

[0037] Figure 2 It is a partial structural schematic diagram of a battery pack connection reliability detection device according to an embodiment of the present invention;

[0038] Figure 3 It is a structural schematic diagram of a lower detection tool and an electrical connector according to an embodiment of the present invention;

[0039] Figure 4 is a flow chart of a method for detecting the connection reliability of a battery pack according to an embodiment of the present invention;

[0040] Figure 5 A schematic block diagram of the structure of a computer device according to an embodiment of the present application.

[0041] Figure 1-3 middle:

[0042] 1. Host computer; 2. Charging and discharging cabinet; 3. High-voltage distribution box; 4. Battery pack; 5. Protection resistor; 6. Voltage drop acquisition device; 7. Electrical connector; 81. Movable end; 82. Fixed end.

[0043] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0046] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0047] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] Reference Figure 1-2The present invention provides a battery pack connection reliability detection device for detecting the connection reliability of each electrical connector 7 in a battery system, wherein the battery system is a system in which a plurality of battery packs form an external output voltage through a plurality of electrical connectors 7, comprising:

[0049] A relay box, a host computer 1, and a plurality of voltage drop acquisition devices 6 controlled by the host computer 1;

[0050] The voltage drop collection device 6 is connected to both ends of the electrical connector 7 to obtain the voltage drop at both ends of the electrical connector 7;

[0051] The pressure drop collection device 6 is used to upload the collected pressure drop to the host computer 1;

[0052] The battery system also includes a relay box, and the host computer 1 is communicatively connected with the relay box to control the on and off of each relay in the relay box;

[0053] The relay box includes a plurality of voltage drop relays, which are connected one-to-one with the electrical connector 7 and are connected in series in the circuit between the voltage drop collection device 6 and the electrical connector 7 to control the on / off of the circuit between the voltage drop collection device 6 and the electrical connector 7.

[0054] In this embodiment, the host computer 1 can be any terminal, such as a computer, a mobile phone, a tablet, etc. The host computer 1 contains detection software, which can analyze and process the acquired voltage drop. The voltage drop acquisition device 6 can be any device that can collect voltage drop, such as an acquisition card, a data acquisition card, a voltmeter, a multimeter, etc. The on and off of the battery pack 4 is controlled by controlling the relay box. It should be noted that the battery pack 4 needs to be over-current discharged during the acquisition process, which can be connected to the control unit in the battery pack 4 through the host computer 1 to control the discharge voltage. After the connection is completed, the communication line of the data acquisition instrument (voltage drop acquisition device 6) is connected to the host computer 1, the software is opened and the configuration file is selected. The configuration file defines the upper and lower limits of the voltage drop at each connection point. After entering the number, the host computer 1 waits for the relay to close and monitor the total pressure. After the external command relay is closed and the constant DC discharge is passed, the host computer 1 issues a command to control the relay box to automatically switch the connection of each electrical connector 7. Each time the relay is cut, a voltage drop is collected once through the voltage drop acquisition device 6. The overall switching time does not exceed 10S, and the voltage drop of each detection channel point is automatically determined according to the upper and lower limit range standards of the selected configuration file. A voltage drop acquisition device 6 can be connected to the two ends of multiple electrical connectors 7, or it can correspond to the electrical connector 7 one by one. Since the voltage drop of the electrical connector 7 is collected in sequence, as few voltage drop acquisition devices 6 as possible are used for collection.

[0055] In one embodiment, a fast-fuse fuse and a protective resistor 5 can also be connected in series between the two end connections of the voltage drop collection device 6 and the electrical connector 7 to prevent the wiring harness from breaking after long-term use of the test tooling, which may cause the risk of short circuit and burn the sampling line fuse in the battery pack; at the end close to the data acquisition instrument, the lead-out line is also connected to a fast-fuse fuse and a protective resistor 5 to prevent short circuit and burn the data acquisition card / instrument.

[0056] In one embodiment, the battery system includes a plurality of high-voltage circuits, and the battery pack connection reliability detection device further includes a high-voltage distribution box 3;

[0057] The high-voltage power distribution box 3 is connected to the host computer 1 , and the host computer 1 controls the on and off of the relay in the high-voltage power distribution box 3 so that the battery system switches different high-voltage circuits to output voltage to the outside.

[0058] In this embodiment, if there are multiple high-voltage circuits (multiple aviation plug interfaces), a high-voltage distribution box 3 is used, and the host computer 1 is used to control the IO card (i.e., relay). The IO card controls the open and closed state of the internal relay of the high-voltage distribution box 3, and the high-voltage circuit connection points are quickly switched, so that each detected electrical connector 7 can be in an overcurrent state, and the voltage drop is detected. After testing all the electrical connection states of an aviation plug (high-voltage circuit), switch to all the electrical connection states of the next aviation plug (high-voltage circuit), and all high-voltage circuits can be detected. In a specific embodiment, the high-voltage distribution box 3 is connected to the host computer 1 and is controlled by the host computer 1.

[0059] Reference Figure 3 , In one embodiment, the battery pack connection reliability detection device further includes a lower detection tool;

[0060] The lower detection tooling includes at least one set of detection components, the detection component includes a fixed end 82 and a movable end 81, the fixed end 82 and the movable end 81 are slidably connected, one end of the voltage drop collection device is connected to the movable end 81 of the detection component, one end of the electrical connector 7 is connected to the movable end 81 of the detection component, and the other end is connected to the other end of the voltage drop collection device, so that the voltage drop collection device 6 collects the voltage at both ends of the electrical connector 7. .

[0061] In this embodiment, since some assembled electrical connectors 7 are not convenient for wiring, they can be detected through the lower detection tooling, that is, through the fixed end 82 and the movable end 81 of the lower detection tooling, the end of the movable end 81 is provided with a metal sheet, and the metal sheet is connected to the voltage drop collection device 6 through a wire, that is, the wire is pre-connected to the metal sheet and led out to the voltage drop collection device 6. When the fixed end 82 drives the movable end 81 to move to one end of the electrical connector 7, the electrical connection between the voltage drop collection device 6 and the electrical connector 7 can be achieved. The other end of the electrical connector 7 is connected to the other end of the voltage drop collection device 6, so that the voltage drop collection device 6 can collect the voltage drop at both ends of the electrical connector 7, thereby measuring the voltage drop of some electrical connectors 7 that are inconvenient to wire.

[0062] In one embodiment, the voltage drop acquisition device 6 is a data acquisition card. In a preferred embodiment, the data acquisition card is specifically a six-and-a-half-bit data acquisition card, which has high-speed data acquisition and transmission capabilities and can collect and process a large amount of data in real time. It has multiple independent data acquisition channels, can collect multiple signals at the same time, and increases the efficiency and flexibility of data acquisition. It has high precision in signal acquisition and processing, and can accurately collect and process various types of signals. The data acquisition card usually supports multiple interfaces and signal types, and can be applied to different application scenarios and data sources. Therefore, the data acquisition card can accurately detect the voltage drop data, and the detected voltage drop accuracy is 0.1mV.

[0063] In one embodiment, a charging and discharging cabinet 2 is further included, and the charging and discharging cabinet 2 is connected to the battery system and is used to discharge the battery system so that the electrical connector 7 is in an overcurrent state.

[0064] In a specific embodiment, the corresponding points in the BMS can be led out, the probe tool harness can be led out one by one (the mother-and-child connector can be connected in the middle), the protection device (protection resistor 5 and acquisition circuit insurance) can be connected in series, and the data acquisition card (containing relays) can be connected. Every two wires form a detection channel. The BMS with the lead harness is replaced with the normal BMS in the battery pack to maintain the normal connection of the BMS line.

[0065] In a specific embodiment, the electrical connector 7 is a copper busbar. By testing a certain number of battery packs in the early stage, a voltage drop upper and lower limit range standard for each electrical connector can be obtained, which is pre-stored in the configuration file. The data from subsequent tests is compared with this data. If it exceeds the set upper and lower limits, it is identified as a defective product.

[0066] Reliability prediction of electrical connection status:

[0067] The method of the present invention is used to perform repeated tests on the same bolt point for multiple times to observe the consistency of the test results.

[0068] The test results are shown in Table 1:

[0069] Table 1

[0070]

[0071] It can be seen from Table 1 that by repeating the test on the same point 5 times, the pressure drop at this point will be collected 3 times in each test, and the data obtained has good repeatability, so it can be considered that the qualification of the product is reliable.

[0072] In one embodiment, before the step S1 of connecting the battery system to an external device for discharging, the method further includes:

[0073] S001: Adjust the connection state of the electrical connector to perform a voltage drop test on the electrical connector in different connection states.

[0074] Specifically, the connection state of the electrical connector can be set by tightening the fixing bolts of the electrical connector. For example, in the tightened state, loosen 1 / 8 turn, 2 / 4 turn, etc. to test the voltage drop under different connection states, so that the reliability of the electrical connector can be detected.

[0075] By artificially loosening the bolt point, such as loosening the bolt by 1 / 8 turn or 1 / 4 turn, the state of the electrical connection point is changed. The present invention detects the state before and after the change, and whether the precise change degree of the test result can determine the state of the point.

[0076] The test results are shown in the following table:

[0077]

[0078] Artificially change the connection status of the same point. From the test results, when the bolt is loosened by 1 / 8 turn, a large constant current is passed, and the measured voltage drop is 7mV greater than the voltage drop at the bolt point in the normal state. When the bolt is loosened by nearly 1 / 4 turn, it is about 95mV compared with the normal value, which can more accurately reflect the state of the electrical connection point under different tightening degrees. By setting a more appropriate upper and lower limit voltage drop range through the host computer software, the state of each point can be determined. This helps companies reduce product performance problems caused by electrical connection status problems in the battery system, reduces safety risks, and facilitates staff to inspect and repair the battery system during actual use.

[0079] Reference Figure 4 The present invention also provides a method for detecting the connection reliability of a battery pack, comprising:

[0080] S1: connecting the battery system to an external device for discharge;

[0081] S2: Control the on and off of each relay in the relay box;

[0082] S3: sequentially collecting voltage drop data of each electrical connector 7 in an overcurrent state through the voltage drop collection device 6;

[0083] S4: Determine whether the battery connection is reliable according to the voltage drop data.

[0084] As described in step S1 above, the battery system is connected to an external device for discharge, wherein the external device is preferably a charging and discharging cabinet 2, and can also be other dischargeable devices. The discharge requires constant current discharge, and the current is output from the battery pack 4 and transmitted to the charging and discharging device via the electrical connector 7.

[0085] As described in the above step S2, the relay in the relay box is controlled by the host computer 1 to be turned on and off so as to discharge the single battery pack 4.

[0086] As described in the above step S3, the voltage drop data of each electrical connector 7 in the overcurrent state is collected in sequence by the voltage drop collection device 6. It should be noted that since the electrical connectors 7 may be connected in series or in parallel, that is, a battery pack 4 may connect one or more electrical connectors 7 and the charging and discharging equipment to form a pathway. Therefore, if a relay is controlled to be closed, the voltage drops of all electrical connectors 7 in the corresponding pathway can be collected.

[0087] As described in the above step S4, whether the battery connection is reliable is determined according to the voltage drop data, wherein the determination method is described in detail in the following embodiments and will not be repeated here.

[0088] In one embodiment, the step S4 of judging whether the battery connection is reliable according to the voltage drop data includes:

[0089] S401: Determine whether the voltage drop data is within a preset range;

[0090] S402: If it is within a preset range, it is determined that the battery connection is reliable.

[0091] As described in the above steps S401-S402, that is, by judging whether the voltage drop data is within a preset range, the preset range is a pre-set range. When the detected voltage drop data is not within the range, it is considered that the connection is unreliable.

[0092] In one embodiment, each electrical connector 7 is tested multiple times to obtain multiple voltage drop data corresponding to each electrical connector 7, and the step S4 of judging whether the battery connection is reliable according to the voltage drop data includes:

[0093] S411: Determine whether the voltage drop data is within a preset range;

[0094] S412: If it is within the preset range, calculate the characteristic vector X of each electrical connector 7 i =

[0095] {(Q q，q-1 ), (Q q，q-2 ),...,(Q q，z )..., (Q q，2 ), (Q q，1 )}, where q represents the qth measurement, X i represents the characteristic vector of the i-th electrical connector 7, (Q q，z ) represents the rate of change of data between the qth measurement and the zth measurement, q, z, i are positive integers, and q>z;

[0096] S413: Calculate the modulus value of the feature vector;

[0097] S414: Determine whether the module value is within a preset module value range;

[0098] S415: If it is within the preset module value range, it is determined that the battery connection is reliable.

[0099] As described in the above steps S411-S415, since the actual situation of some electrical connectors 7 is relatively complicated, it may happen that the detected voltage drop data are all within the preset range and are still qualified after multiple tests. At this time, it is necessary to detect further situations, that is, the change situation to make a judgment, that is, calculate the characteristic vectors of each electrical connector 7, and make a judgment based on the change rate. If the change rate is small, it means that there is no problem with the connection here. If the change rate is large, it means that there are some problems with the electrical connector 7 that need to be checked or replaced. Specifically, after calculating the characteristic vector, calculate its modulus, and then judge whether the modulus is within the preset modulus range. If it is within the preset modulus range, it is determined that the battery connection is reliable. Thereby further detection of the connection reliability of the electrical connector 7 is achieved, thereby improving the yield rate.

[0100] The beneficial effects of the present invention are as follows: by connecting the voltage drop acquisition device 6 to the two ends of the electrical connector 7 to obtain the voltage drop at the two ends of the electrical connector 7, there is no need for manual handheld equipment to detect each electrical connector 7, which saves time and human resources and also improves accuracy, precision and safety.

[0101] Reference Figure 5 In an embodiment of the present application, a computer device is also provided. The computer device may be a server, and its internal structure may be as follows: Figure 5As shown. The computer device includes a processor, a memory, a network interface and a database connected via a system bus. Among them, the processor designed by the computer is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store various voltage drop data, etc. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the battery pack connection reliability detection method described in any of the above embodiments can be implemented.

[0102] Those skilled in the art will understand that Figure 5 The structure shown in is merely a block diagram of a portion of the structure related to the present application solution and does not constitute a limitation on the computer device to which the present application solution is applied.

[0103] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method for detecting the connection reliability of a battery pack described in any of the above embodiments can be implemented.

[0104] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media provided in this application and used in the embodiments can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0105] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, device, article or method including the element.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A battery pack connection reliability detection device, used to detect the connection reliability of each electrical connector in a battery system, wherein: The battery system uses an overcurrent method to supply power to each of the electrical connectors, and is characterized by comprising: A relay box, a host computer, and a plurality of voltage drop acquisition devices controlled by the host computer; The voltage drop collection device is connected to both ends of the electrical connector to obtain the voltage drop at both ends of the electrical connector; The pressure drop collection device is used to upload the collected pressure drop to the host computer; The relay box includes a plurality of voltage drop relays, which are connected to the electrical connectors one by one and are connected in series in the circuit between the voltage drop collection device and the electrical connector to control the on-off of the circuit between the voltage drop collection device and the electrical connector.

2. The battery pack connection reliability detection device according to claim 1, wherein the battery system comprises a plurality of high-voltage circuits, characterized in that: It also includes a high voltage distribution box; The high-voltage distribution box is connected to the host computer, and the host computer controls the on and off of the relay in the high-voltage distribution box so that the battery system switches to different high-voltage circuits to put the electrical connector in different overcurrent states.

3. The battery pack connection reliability detection device according to claim 1, characterized in that: It also includes a lower detection tooling; The lower detection tooling includes at least one group of detection components, the detection component includes a fixed end and a movable end, the fixed end and the movable end are slidably connected, one end of the voltage drop collection device is connected to the movable end of the detection component, one end of the electrical connector is connected to the movable end of the detection component, and the other end is connected to the other end of the voltage drop collection device, so that the voltage drop collection device can collect the voltage at both ends of the electrical connector.

4. The battery pack connection reliability detection device according to claim 1, characterized in that: The voltage drop acquisition device is a data acquisition card.

5. The battery pack connection reliability detection device according to claim 1, characterized in that: It also includes a charging and discharging cabinet, which is connected to the battery system and is used to discharge the battery system so that the electrical connector is in an overcurrent state.

6. The battery pack connection reliability detection device according to claim 1, characterized in that: The relay box is connected to the host computer and is controlled by the host computer.

7. A method for detecting the connection reliability of a battery pack, characterized in that: include: Connecting the battery system to an external device for discharging; Controlling the on and off of each relay in the relay box; The voltage drop data of each electrical connector in the overcurrent state is collected in sequence by a voltage drop collection device; Whether the battery connection is reliable is determined according to the voltage drop data.

8. The method for detecting the connection reliability of a battery pack according to claim 7, characterized in that: The step of judging whether the battery connection is reliable according to the voltage drop data comprises: Determining whether the pressure drop data is within a preset range; If it is within the preset range, it is determined that the battery connection is reliable.

9. The method for detecting the connection reliability of a battery pack according to claim 7, characterized in that: Performing multiple tests on each electrical connector to obtain multiple voltage drop data corresponding to each electrical connector, and judging whether the battery connection is reliable according to the voltage drop data includes: Determining whether the pressure drop data is within a preset range; If it is within the preset range, the characteristic vector X of each electrical connector is calculated. i = {(Q q，q-1 ), (Q q，q-2 ),...,(Q q，z )..., (Q q，2 ), (Q q，1 )}, where q represents the qth measurement, X i represents the characteristic vector of the i-th electrical connector, (Q q，z ) represents the rate of change of data between the qth measurement and the zth measurement, q, z, i are positive integers, and q>z; Calculating the modulus of the eigenvector; Determining whether the modulus value is within a preset modulus value range; If it is within the preset module value range, it is determined that the battery connection is reliable.

10. The method for detecting the connection reliability of a battery pack according to claim 7, characterized in that: Before the step of connecting the battery system to an external device for discharging, the method further includes: The connection state of the electrical connector is adjusted to perform voltage drop tests on the electrical connector in different connection states.

11. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 7 to 10 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 7 to 10 are implemented.

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