Liquid leakage detection device of battery module

Abstract

The invention belongs to the technical field of battery module detection, particularly relates to a liquid leakage detection device of a battery module, and aims to solve the problems of low liquid leakage detection precision, complex operation, long detection period and the like of the existing battery module, the following scheme is provided: the liquid leakage detection device comprises a battery module, and the battery module is composed of a plurality of cuboid battery cells and a metal shell; the battery module liquid leakage detection device further comprises a detection box, the interior of the detection box is divided into a detection cavity, two moving cavities, a positioning cavity and a mounting cavity by a plurality of partition plates, the two moving cavities are located on the two sides of the detection cavity respectively, and the positioning cavity is located on one side of one moving cavity. The detection efficiency and accuracy are improved; the supporting assembly achieves stable supporting and automatic resetting, the positioning assembly guarantees accurate locking and unlocking, the detection assembly efficiently and accurately detects the insulation performance and discovers liquid leakage signs in time, the overall design automation degree is high, operation is convenient, and use is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of battery module detection, and in particular to a battery module leakage detection device. Background Art

[0002] With the continuous development of new energy technologies, battery modules, as key components in electric vehicles, energy storage systems and other fields, are receiving more and more attention for their safety and reliability. During the use of battery modules, electrolyte leakage may occur due to various reasons such as production process, material aging, external damage, etc. Electrolyte leakage will not only affect the performance of the battery module, but may also pollute the surrounding environment and even cause safety accidents. Therefore, leakage detection of battery modules is an important part of ensuring the quality and safety of battery modules.

[0003] Traditional battery module leakage detection methods mostly use visual inspection or weight detection. Manual visual inspection relies on the experience and judgment of the inspector, is easily affected by subjective factors, and is difficult to detect tiny leaks, resulting in low detection accuracy. The weight method requires weighing the battery module before and after detection, and comparing the weight change to determine whether there is a leak. This method is complicated to operate, has a long detection cycle, and cannot accurately detect battery modules that have leaked but have not yet formed an obvious weight change. It is difficult to meet the needs of modern production for fast and accurate detection of battery modules.

[0004] In view of the above problems, the present invention document proposes a leakage detection device for a battery module. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art in battery module leakage detection, such as low accuracy, complex operation, and long detection cycle, and to propose a battery module leakage detection device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A battery module leakage detection device, comprising:

[0008] A battery module, wherein the battery module is composed of a plurality of rectangular cells and a metal casing;

[0009] It also includes a detection box, the interior of which is divided into a detection chamber, two movable chambers, a positioning chamber and an installation chamber by a plurality of partitions, the two movable chambers are respectively located on both sides of the detection chamber, the positioning chamber is located on one side of one of the movable chambers, and the installation chamber is located on one side of the detection chamber, the two movable chambers and the positioning chamber;

[0010] It also includes a movable top cover, which is hinged to the top of the detection box and is sealed with the detection cavity to complete the sealing of the detection cavity;

[0011] It also includes a vacuum pump, which is fixedly installed inside the installation cavity, and the air inlet end of the vacuum pump is connected to the inside of the detection cavity through a pipeline, and an air outlet pipe is fixedly installed on one side of the detection box, and the air outlet end of the vacuum pump is fixedly connected to one end of the air outlet pipe through the pipeline;

[0012] It also includes a support assembly, which is used to support and push out the battery module;

[0013] It also includes a positioning assembly, which is used to position and lock the support assembly;

[0014] It also includes a detection component, which is used to detect the insulation performance of the battery module.

[0015] In a possible design, the support assembly includes a first L-shaped support plate and a second L-shaped support plate arranged in the detection cavity, the first L-shaped support plate and the second L-shaped support plate are both located below the battery module and are used to support the battery module, a plurality of moving blocks are fixedly installed on one side of the first L-shaped support plate and the second L-shaped support plate, a plurality of slide grooves are provided on the sides of the two moving cavities close to each other, and the plurality of slide grooves are matched with adjacent moving blocks, and the plurality of moving blocks located on the same side all penetrate the corresponding slide grooves and are slidably arranged on the inner walls of the corresponding moving cavities, a plurality of guide rods are fixedly installed inside the two moving cavities, one ends of the plurality of guide rods slide through the corresponding moving blocks, and the outer walls of the plurality of guide rods are sleeved with second springs, one ends of the plurality of second springs are fixedly connected to the bottom inner wall of the moving cavity, and the other ends of the plurality of second springs are fixedly connected to the bottom of the adjacent moving blocks.

[0016] In a possible design, the positioning assembly includes a plurality of fixed rods horizontally fixedly installed in the positioning cavity, the outer walls of the plurality of fixed rods are slidably provided with the same blocking block, one side of the blocking block is provided with a plurality of protrusions, the plurality of protrusions at one end of the blocking block all slide through one side of the positioning cavity and extend into an adjacent moving cavity, the blocking block cooperates with the tops of a plurality of adjacent moving blocks through a plurality of protrusions to limit the movement of the moving blocks, the outer walls of the plurality of fixed rods are all sleeved with a third spring, one end of the plurality of third springs is fixedly connected to one side of the blocking block, and the other end of the plurality of third springs is fixedly connected to an inner wall of one side of the positioning cavity.

[0017] In a possible design, the positioning assembly also includes a fixed plate fixedly installed in the positioning cavity, a connecting plate is arranged below the fixed plate, two connecting rods are fixedly installed on the top of the connecting plate, the top ends of the two connecting rods slide through the fixed plate and slide through the top of the detection box, a plurality of pressing rods are fixedly installed on the bottom of the connecting plate, a slope is arranged on the top of the card block, the bottom ends of the plurality of pressing rods cooperate with the top slope of the card block, and are used to drive the card block to slide back into the positioning cavity to release the limit on the moving block; the same pressing plate is fixedly installed on the top ends of the two connecting rods, and the pressing plate is used to facilitate the pressing and pushing of multiple pressing rods.

[0018] In one possible design, the detection component includes an insulation resistance tester fixedly embedded in the top of the movable top cover, the insulation resistance tester is used to detect the insulation performance of the battery module to be detected, the first L-shaped support plate and the second L-shaped support plate are fixedly embedded with connecting electrodes on the side close to each other, and the top of the second L-shaped support plate is fixedly installed with a connecting plug, the connecting plug is electrically connected to the adjacent connecting electrode, and one end of the connecting plug is fixedly connected to a spring wire, and the spring wire is electrically connected to one of the detection poles of the insulation resistance tester.

[0019] In a possible design, the detection assembly also includes a sealing tube fixedly passing through the movable top cover, the inner wall of the sealing tube is sealingly and slidably connected to a moving rod, one end of the moving rod is fixedly connected to a detection head, the detection head is located in the detection cavity, and cooperates with the metal shell of the battery module, the outer wall of the moving rod is sleeved with a first spring, one end of the first spring is fixedly connected to the top end of the sealing tube, the other end of the first spring is fixedly connected to the outer wall of the moving rod, and the detection head is electrically connected to the other detection pole of the insulation resistance tester.

[0020] In a possible design, a pressure sensor is fixedly mounted on the bottom of the movable top cover, and the pressure sensor is used to detect pressure changes in the detection cavity.

[0021] In a possible design, a liquid-absorbing cotton board is fixedly mounted on the bottom inner wall of the detection cavity, and the liquid-absorbing cotton board is used to absorb the electrolyte leaked from the battery module in the detection cavity for subsequent cleaning.

[0022] Beneficial effects: In the present invention, the battery module leakage detection device extracts the air in the detection chamber by a vacuum pump to form a negative pressure environment, so that it can more sensitively detect whether the battery module is leaking. At the same time, the setting of the absorbent cotton plate can absorb the electrolyte leaked from the battery module in the detection chamber, which is convenient for subsequent cleaning and improves the detection efficiency and accuracy.

[0023] In the present invention, the battery module leakage detection device, the support assembly realizes the stable support and automatic reset function of the battery module through the cooperation of the moving block, the slide groove, the guide rod and the second spring, making the detection process more automated and convenient;

[0024] In the present invention, in the battery module leakage detection device, the positioning component realizes the precise positioning locking and unlocking function of the support component through the cooperation of the clamping block, the fixing rod, the third spring, the fixing plate, the connecting plate, the connecting rod, the pressing rod and the pressing plate, thereby further improving the stability and accuracy of the detection;

[0025] In the present invention, the battery module leakage detection device, the detection component through the insulation resistance tester, the connection electrode, the connection plug, the spring wire and the detection head to achieve efficient and accurate detection of the insulation performance of the battery module, can timely find the insulation defects of the battery module, thereby completing the judgment of whether the battery module is leaking, providing strong support for the quality control and safety of the battery module;

[0026] In the present invention, the battery module leakage detection device ensures the sealing of the detection process through the sealing cooperation between the movable top cover and the detection cavity, avoiding the influence of external factors on the detection results. At the same time, the setting of the pressure sensor can monitor the pressure changes in the detection cavity in real time, further improving the accuracy and reliability of the detection.

[0027] In the present invention, the battery module leakage detection device creates a negative pressure environment through a vacuum pump to sensitively detect leakage, and the absorbent cotton plate effectively absorbs electrolyte to improve detection efficiency and accuracy; the support component realizes stable support and automatic resetting, the positioning component ensures precise locking and unlocking, and the detection component efficiently and accurately detects insulation performance and promptly discovers signs of leakage; the movable top cover seal cooperates with the pressure sensor for real-time monitoring to ensure the detection sealing and accuracy. The overall design has a high degree of automation and is easy to operate, providing strong support for battery module quality control and safety assurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a battery module leakage detection device proposed by the present invention;

[0029] Figure 2 A schematic diagram of the structure of a battery module leakage detection device proposed by the present invention in an open state;

[0030] Figure 3 A schematic diagram of the front cross-sectional structure of a battery module leakage detection device proposed by the present invention;

[0031] Figure 4A schematic diagram of a top cross-sectional structure of a battery module leakage detection device proposed by the present invention;

[0032] Figure 5 A schematic diagram of the structure of an L-shaped support plate of a battery module leakage detection device proposed by the present invention;

[0033] Figure 6 This is a schematic diagram of the enlarged structure of part A of a battery module leakage detection device proposed by the present invention;

[0034] Figure 7 This is a schematic structural diagram of a positioning component of a battery module leakage detection device proposed by the present invention.

[0035] In the figure: 1. detection box; 2. movable top cover; 3. battery module; 4. detection chamber; 5. moving chamber; 6. positioning chamber; 7. absorbent cotton board; 8. first L-shaped support plate; 9. second L-shaped support plate; 10. sealing tube; 11. moving rod; 12. first spring; 13. detection head; 14. insulation resistance tester; 15. installation chamber; 16. vacuum pump; 17. air outlet pipe; 18. connecting electrode; 19. connecting plug; 20. spring wire; 21. slide groove; 22. guide rod; 23. second spring; 24. fixing rod; 25. block; 26. third spring; 27. fixing plate; 28. connecting rod; 29. ​​connecting plate; 30. pressing rod; 31. moving block; 32. pressing plate; 33. pressure sensor. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Example 1: Reference Figure 1-7 , a leakage detection device, including: a battery module 3, a detection box 1, a movable top cover 2, a vacuum pump 16, a supporting component, a positioning component and a detection component.

[0038] The battery module 3 is composed of multiple rectangular battery cells and a metal shell. The interior of the detection box 1 is divided into a detection cavity 4, two movable cavities 5, a positioning cavity 6 and an installation cavity 15 by multiple partitions. The two movable cavities 5 are respectively located on both sides of the detection cavity 4, the positioning cavity 6 is located on one side of one of the movable cavities 5, and the installation cavity 15 is located on one side of the detection cavity 4, the two movable cavities 5 and the positioning cavity 6.

[0039] The movable top cover 2 is hinged to the top of the detection box 1 , and the movable top cover 2 is sealed with the detection cavity 4 to complete the sealing of the detection cavity 4 .

[0040] The vacuum pump 16 is fixedly installed inside the installation cavity 15, and the air inlet end of the vacuum pump 16 is connected to the inside of the detection cavity 4 through a pipeline. An air outlet pipe 17 is fixedly installed on one side of the detection box 1, and the air outlet end of the vacuum pump 16 is fixedly connected to one end of the air outlet pipe 17 through a pipeline.

[0041] The support assembly is used to complete the support and push-out of the battery module 3, and includes a first L-shaped support plate 8 and a second L-shaped support plate 9 arranged in the detection cavity 4. The first L-shaped support plate 8 and the second L-shaped support plate 9 are both located below the battery module 3 and are used to support the battery module 3. Multiple moving blocks 31 are fixedly installed on one side of the first L-shaped support plate 8 and the second L-shaped support plate 9. Multiple slide grooves 21 are opened on the side where the two moving cavities 5 are close to each other, and the multiple slide grooves 21 are matched with adjacent moving blocks 31. Multiple moving blocks 31 located on the same side all penetrate the corresponding slide grooves 21 and are slidably arranged on the inner wall of the corresponding moving cavity 5. Multiple guide rods 22 are fixedly installed inside the two moving cavities 5. One end of the multiple guide rods 22 slides through the corresponding moving blocks 31. The outer walls of the multiple guide rods 22 are sleeved with second springs 23. One end of the multiple second springs 23 is fixedly connected to the bottom inner wall of the moving cavity 5, and the other end of the multiple second springs 23 is fixedly connected to the bottom of the adjacent moving block 31.

[0042] The positioning assembly is used to position and lock the support assembly, and includes a plurality of fixed rods 24 fixedly installed horizontally in the positioning cavity 6. The outer walls of the plurality of fixed rods 24 are slidably provided with a same block 25. A plurality of protrusions are provided on one side of the block 25. The plurality of protrusions on one side of the block 25 all slide through one side of the positioning cavity 6 and extend into the adjacent moving cavity 5. The tops of the plurality of protrusions on one side of the block 25 are all provided with inclined surfaces. The block 25 cooperates with the tops of the plurality of adjacent moving blocks 31 through the plurality of protrusions to limit the movement of the moving blocks 31. The outer walls of the plurality of fixed rods 24 are all sleeved with third springs 26. One end of the plurality of third springs 26 is fixedly connected to one side of the block 25, and the other end of the plurality of third springs 26 is fixedly connected to the inner wall of one side of the positioning cavity 6.

[0043] The positioning assembly also includes a fixed plate 27 fixedly installed in the positioning cavity 6, a connecting plate 29 is arranged below the fixed plate 27, two connecting rods 28 are fixedly installed on the top of the connecting plate 29, the tops of the two connecting rods 28 are slid through the fixed plate 27 and the top of the detection box 1, a plurality of pressing rods 30 are fixedly installed on the bottom of the connecting plate 29, a bevel is arranged on the top of the card block 25, and the bottom ends of the plurality of pressing rods 30 are matched with the top bevel of the card block 25, and are used to drive the card block 25 to slide back into the positioning cavity 6 to release the limit of the moving block 31. The tops of the two connecting rods 28 are fixedly installed with the same pressing plate 32, and the pressing plate 32 is used to facilitate the pressing and pushing of the plurality of pressing rods 30.

[0044] The detection component is used to detect the insulation performance of the battery module 3, and includes an insulation resistance tester 14 fixedly embedded in the top of the movable top cover 2. The insulation resistance tester 14 is used to detect the insulation performance of the battery module 3 to be detected. The first L-shaped support plate 8 and the second L-shaped support plate 9 are fixedly embedded with connecting electrodes 18 on the side close to each other. The top of the second L-shaped support plate 9 is fixedly installed with a connecting plug 19, which is electrically connected to the adjacent connecting electrode 18. One end of the connecting plug 19 is fixedly connected with a spring wire 20, and the spring wire 20 is electrically connected to one of the detection poles of the insulation resistance tester 14. Among them, the insulation resistance tester 14 is the same as that in the patent with announcement number CN221199839U.

[0045] The detection assembly also includes a sealing tube 10 fixedly passing through the movable top cover 2, the inner wall of the sealing tube 10 is sealingly and slidably connected with a moving rod 11, one end of the moving rod 11 is fixedly connected with a detection head 13, and the detection head 13 is located in the detection cavity 4, which cooperates with the metal shell of the battery module 3. The outer wall of the moving rod 11 is sleeved with a first spring 12, one end of the first spring 12 is fixedly connected to the top of the sealing tube 10, and the other end of the first spring 12 is fixedly connected to the outer wall of the moving rod 11, and the detection head 13 is electrically connected to the other detection pole of the insulation resistance tester 14.

[0046] The present application can be used in the field of battery module detection technology, and can also be used in other fields applicable to the present application.

[0047] Example 2: Reference Figure 1 , 2 3. Improvement on the basis of Example 1: a battery module leakage detection device, which is applied to the field of battery module detection technology;

[0048] In this embodiment, a pressure sensor 33 is fixedly installed at the bottom of the movable top cover 2. The pressure sensor 33 is used to detect the pressure change in the detection chamber 4 to further improve the detection effect of leakage of the battery module 3. The pressure sensor 33 is the same as that in the patent with announcement number CN221836981U.

[0049] In this embodiment, a liquid-absorbing cotton board 7 is fixedly installed on the bottom inner wall of the detection cavity 4, and the liquid-absorbing cotton board 7 is used to absorb the electrolyte leaked from the battery module 3 in the detection cavity 4 for subsequent cleaning.

[0050] In this embodiment, a handle is fixedly installed on the top of the movable top cover 2, and the handle can facilitate the user to open the movable top cover 2 for easy use.

[0051] However, as is well known to those skilled in the art, the working principle and wiring method of the vacuum pump 16 are commonplace, and are conventional means or common knowledge, and are not described in detail here. Those skilled in the art may make any selections according to their needs or convenience.

[0052] The working principle and use process of the present technical solution are as follows: when in use, the first L-shaped support plate 8 and the second L-shaped support plate 9 will be lifted up under the drive of the multiple second springs 23, and then the user can place the battery module 3 to be tested on the lifted first L-shaped support plate 8 and the second L-shaped support plate 9. When placing, ensure that one end of the electrode of the battery module 3 is in close contact with the connecting electrode 18 on one side of the second L-shaped support plate 9, and then the user can press the battery module 3 or the first L-shaped support plate 8 and the second L-shaped support plate 9 to move it downward as a whole; when the multiple moving blocks 31 on one side of the second L-shaped support plate 9 approach the card block 25 during movement, since the tops of the multiple protrusions on one side of the card block 25 are all provided with inclined surfaces, the multiple moving blocks 31 will squeeze the card block 25 to make it retreat until The multiple moving blocks 31 all move to the bottom of the card block 25. At this time, the card block 25 is pushed out under the action of the multiple third springs 26, and the multiple protrusions on one side of it will be stuck on the top of the corresponding moving block 31. At the same time, under the pushing action of the multiple second springs 23, the second L-shaped support plate 9 can be positioned, and then the battery module 3 can be continuously placed in the detection chamber 4; then, the user can close the movable top cover 2, and then start the vacuum pump 16 to extract the air in the detection chamber 4, so that the detection chamber 4 is in a vacuum state; in a vacuum environment, if the battery module 3 leaks, the leaked electrolyte may evaporate to produce gas, or the gas may leak due to damage to the internal structure of the battery. These gases will form an obvious pressure difference in a vacuum environment. At this time Since the pressure sensor 33 continuously detects the pressure in the detection chamber 4, by detecting the pressure difference in the detection chamber 4, it can be preliminarily determined whether the battery module 3 has leakage or damage; then, the user can press the moving rod 11 to move it downward, and finally make the detection head 13 contact the metal shell of the battery module 3. Since the insulation resistance tester 14 has been connected to one end of the battery module 3 through the spring wire 20 and the connecting electrode 18 when the battery module 3 is installed, at this time, when the detection head 13 contacts the metal shell of the battery module 3, the insulation resistance tester 14 can detect the insulation performance of the shell of the battery module 3; according to the resistance value displayed by the insulation resistance tester 14, it can be determined whether the insulation performance of the battery module 3 is qualified. If the insulation resistance tester 14 is good, it can be used to determine whether the insulation performance of the battery module 3 is good. If there is leakage in the battery module 3, the leaked electrolyte may penetrate into the inside or outside of the battery module 3, resulting in a decrease in insulation performance; by comparing the resistance value obtained by the test with the specified insulation resistance value, it can be determined whether the battery module 3 has a leakage problem; when the test is completed, the user can open the movable top cover 2, and then press the pressing plate 32 to move the multiple pressing rods 30 downward, and the multiple pressing rods 30 can squeeze the inclined surface at the top of the card block 25 to retract the card block 25 into the positioning cavity 6. At this time, the restriction on the second L-shaped support plate 9 is released, and under the action of the multiple second springs 23, the first L-shaped support plate 8 and the second L-shaped support plate 9 can rise and lift the battery module 3, which can facilitate the user to remove the battery module 3 and complete the placement of a new batch of battery modules 3;When the user uses the device, the absorbent cotton plate 7 should be checked and replaced regularly to ensure that it can continue to remain in a relatively dry state to complete the absorption of the leaked electrolyte and ensure that the detection cavity 4 is clean. ;

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery module leakage detection device, characterized in that: include: A battery module (3), wherein the battery module (3) is composed of a plurality of rectangular parallelepiped battery cells and a metal casing; It also comprises a detection box (1), the interior of the detection box (1) being divided into a detection chamber (4), two movable chambers (5), a positioning chamber (6) and an installation chamber (15) by a plurality of partitions, the two movable chambers (5) being respectively located on both sides of the detection chamber (4), the positioning chamber (6) being located on one side of one of the movable chambers (5), and the installation chamber (15) being located on one side of the detection chamber (4), the two movable chambers (5) and the positioning chamber (6); It also comprises a movable top cover (2), the movable top cover (2) being hinged to the top of the detection box (1), the movable top cover (2) being in sealing cooperation with the detection chamber (4) to complete the sealing of the detection chamber (4); It also includes a vacuum pump (16), the vacuum pump (16) is fixedly installed inside the installation cavity (15), the air inlet end of the vacuum pump (16) is connected to the inside of the detection cavity (4) through a pipeline, an air outlet pipe (17) is fixedly installed on one side of the detection box (1), and the air outlet end of the vacuum pump (16) is fixedly connected to one end of the air outlet pipe (17) through a pipeline; It also includes a support assembly, which is used to support and push out the battery module (3); It also includes a positioning assembly, which is used to position and lock the support assembly; It also comprises a detection component, which is used to detect the insulation performance of the battery module (3).

2. A battery module leakage detection device according to claim 1, characterized in that: The support assembly comprises a first L-shaped support plate (8) and a second L-shaped support plate (9) which are arranged in the detection cavity (4); the first L-shaped support plate (8) and the second L-shaped support plate (9) are both located below the battery module (3) and are used to support the battery module (3); a plurality of moving blocks (31) are fixedly installed on one side of the first L-shaped support plate (8) and the second L-shaped support plate (9); a plurality of slide grooves (21) are provided on the sides of the two moving cavities (5) which are close to each other; the plurality of slide grooves (21) are matched with adjacent moving blocks (31) and are located at the same The plurality of moving blocks (31) on one side all penetrate the corresponding slide grooves (21) and are slidably arranged on the inner wall of the corresponding moving cavity (5); a plurality of guide rods (22) are fixedly installed inside the two moving cavities (5); one end of the plurality of guide rods (22) all slides through the corresponding moving blocks (31); the outer walls of the plurality of guide rods (22) are sleeved with second springs (23); one end of the plurality of second springs (23) are fixedly connected to the bottom inner wall of the moving cavity (5); and the other end of the plurality of second springs (23) are fixedly connected to the bottom of the adjacent moving block (31).

3. A battery module leakage detection device according to claim 2, characterized in that: The positioning assembly comprises a plurality of fixed rods (24) fixedly installed horizontally in the positioning cavity (6); the outer walls of the plurality of fixed rods (24) are slidably provided with a same clamping block (25); one side of the clamping block (25) is provided with a plurality of protrusions; the plurality of protrusions at one end of the clamping block (25) all slide through one side of the positioning cavity (6) and extend into the adjacent moving cavity (5); the clamping block (25) cooperates with the tops of the plurality of adjacent moving blocks (31) through the plurality of protrusions to limit the movement of the moving blocks (31); the outer walls of the plurality of fixed rods (24) are sleeved with a third spring (26); one end of the plurality of third springs (26) is fixedly connected to one side of the clamping block (25); and the other end of the plurality of third springs (26) is fixedly connected to an inner wall of one side of the positioning cavity (6).

4. A battery module leakage detection device according to claim 3, characterized in that: The positioning assembly also includes a fixed plate (27) fixedly installed in the positioning cavity (6), a connecting plate (29) is arranged below the fixed plate (27), two connecting rods (28) are fixedly installed on the top of the connecting plate (29), the top ends of the two connecting rods (28) are slidably passed through the fixed plate (27) and the top of the detection box (1), a plurality of pressing rods (30) are fixedly installed on the bottom of the connecting plate (29), the top of the block (25) is provided with an inclined surface, the bottom ends of the plurality of pressing rods (30) are matched with the top inclined surface of the block (25), and are used to drive the block (25) to slide back into the positioning cavity (6) to release the limit of the moving block (31); the top ends of the two connecting rods (28) are fixedly installed with the same pressing plate (32), and the pressing plate (32) is used to facilitate the pressing and pushing of the plurality of pressing rods (30).

5. A battery module leakage detection device according to claim 2, characterized in that: The detection component comprises an insulation resistance tester (14) fixedly embedded in the top of the movable top cover (2), and the insulation resistance tester (14) is used to detect the insulation performance of the battery module (3) to be detected. The first L-shaped support plate (8) and the second L-shaped support plate (9) are fixedly embedded with connecting electrodes (18) on the side close to each other, and the top of the second L-shaped support plate (9) is fixedly installed with a connecting plug (19), and the connecting plug (19) is electrically connected to the adjacent connecting electrode (18). One end of the connecting plug (19) is fixedly connected to a spring wire (20), and the spring wire (20) is electrically connected to one of the detection poles of the insulation resistance tester (14).

6. A battery module leakage detection device according to claim 5, characterized in that: The detection assembly also includes a sealing tube (10) fixedly passing through the movable top cover (2); the inner wall of the sealing tube (10) is sealingly and slidably connected to a moving rod (11); one end of the moving rod (11) is fixedly connected to a detection head (13); the detection head (13) is located in the detection chamber (4) and cooperates with the metal shell of the battery module (3); the outer wall of the moving rod (11) is sleeved with a first spring (12); one end of the first spring (12) is fixedly connected to the top end of the sealing tube (10); the other end of the first spring (12) is fixedly connected to the outer wall of the moving rod (11); the detection head (13) is electrically connected to another detection pole of an insulation resistance tester (14).

7. A battery module leakage detection device according to claim 6, characterized in that: A pressure sensor (33) is fixedly mounted on the bottom of the movable top cover (2), and the pressure sensor (33) is used to detect pressure changes in the detection chamber (4).

8. A battery module leakage detection device according to claim 1, characterized in that: A liquid-absorbing cotton board (7) is fixedly mounted on the inner wall of the bottom of the detection cavity (4), and the liquid-absorbing cotton board (7) is used to absorb electrolyte leaked from the battery module (3) in the detection cavity (4) for subsequent cleaning.

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