Air tightness detection self-locking device and battery air tightness detection system

Abstract

The utility model relates to the technical field of vehicle battery airtightness detection, in particular to an airtightness detection self-locking device and a battery airtightness detection system. The air tightness detection self-locking device comprises a driving piece, a shell and a locking hook assembly, a channel is formed in the shell, one end of the shell is connected with the driving piece, and the other end of the shell is provided with a material containing table top and a through groove communicated with the channel; the material placing table surface is positioned at the opening of the through groove; the locking hook assembly is arranged in the shell, one end of the locking hook assembly is connected with the driving piece, and the other end of the locking hook assembly extends along the channel and is provided with a hook part; the locking hook assembly is provided with a first position and a second position, and the driving piece can drive the locking hook assembly to move in the channel so that the locking hook assembly can be switched between the first position and the second position. At the first position, one end of the shell can penetrate through a positioning hole in a box body of the battery to form primary positioning; and at the second position, a clamping gap is formed between the hook part and the material placing table surface to form secondary positioning, so that automatic locking of the battery is realized.

Description

Technical Field

[0001] This application relates to the field of vehicle battery airtightness testing technology, and in particular to an airtightness testing self-locking device and a battery airtightness testing system. Background Technology

[0002] In the production of new energy vehicles, the power battery, as a core component, directly affects the safety of the entire vehicle. Among these components, airtightness testing is a crucial step in ensuring the performance of the power battery. Battery airtightness testing first involves securing the battery to an airtightness testing fixture using a locking device, and then performing the airtightness test on the battery.

[0003] However, existing locking devices use an external clamping plate to press the edge of the battery case to lock the battery in order to position the battery. The locking process relies on manual operation, requiring repeated operation of the handle to press the locking device onto the battery case. This may result in unstable positioning or inaccurate battery airtightness detection due to inconsistent locking force, and the detection efficiency is also low. Utility Model Content

[0004] Therefore, it is necessary to provide a self-locking device for airtightness detection and a battery airtightness detection system that can stably clamp and position the battery, achieve automatic locking, and improve detection efficiency.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] An airtightness detection self-locking device is used to lock a battery casing, wherein the casing has a positioning hole, and the airtightness detection self-locking device includes:

[0007] Drive components;

[0008] The housing has one end mounted on the drive unit and has a channel inside. The end of the housing away from the drive unit has a material placement platform and a through groove communicating with the channel. The material placement platform is located at the opening of the through groove.

[0009] A locking hook assembly is disposed within the housing, with one end of the locking hook assembly connected to the drive member and the other end extending along the channel and having a hook portion; furthermore, the locking hook assembly has a first position and a second position, and the drive member is capable of driving the locking hook assembly to move within the channel, so that the locking hook assembly switches between the first position and the second position;

[0010] When the locking hook assembly is in the first position, the end of the housing away from the driving member can pass through the positioning hole, and the material placement table can abut against one side of the box body; when the locking hook assembly is in the second position, the hook moves to the opening and abuts against one side of the box body, so as to form a clamping gap with the material placement table and clamp the box body.

[0011] Understandably, this application achieves automatic clamping and locking of the box by setting a locking hook assembly and switching it between a first position and a second position via a driving component. This eliminates the need for manual operation, thereby improving the efficiency of battery airtightness testing, and the automatic clamping force can be controlled. Simultaneously, when the locking hook assembly is in the first position, the end of the housing furthest from the driving component can pass through the positioning hole, achieving primary positioning of the box. When the locking hook assembly is in the second position, a clamping gap is formed between the hook and the material placement platform, achieving secondary positioning of the box. Thus, the characteristics of the locking hook assembly can be used to perform two positioning operations on the box, making the box locking more stable.

[0012] In one embodiment, the locking hook assembly includes a support and a locking hook. The support is fixed to the output shaft of the drive member, the locking hook extends along the channel, and one end of the locking hook is rotatably connected to the support, while the other end is provided with the hook portion.

[0013] In one embodiment, the locking hook assembly further includes a first rotating shaft. The locking hook has a first hole and a second hole that communicate with each other. The first hole extends along the axial direction of the channel, and the second hole is angled relative to the first hole and extends in an axial direction away from the channel. The first rotating shaft is fixed to the housing and passes through the first hole.

[0014] In response to the action of the drive member, the first rotating shaft can switch positions between the first hole and the second hole to cause the locking hook to switch positions between the first position and the second position, and when the locking hook assembly is in the second position, the first rotating shaft is in the second hole.

[0015] Understandably, the first hole ensures that the locking hook moves along the axis of the channel, allowing it to move to the second position and achieve the locking function. The second hole ensures that the locking hook moves towards the axis of the channel, allowing it to move to the first position to release the lock.

[0016] In one embodiment, the housing has a first shaft hole and an annular groove. The first shaft hole communicates with the channel, and the annular groove is located on the outer wall of the housing and surrounds the circumference of the first shaft hole. The first rotating shaft passes through the first shaft hole and through the first hole.

[0017] A retaining ring is provided in the annular groove, and the retaining ring is sleeved on the first rotating shaft.

[0018] It is understandable that the first rotating shaft passes through the first shaft hole to connect the locking hook to the housing, and the retaining ring is used to limit the first rotating shaft to prevent it from falling out of the first shaft hole, thereby further improving the stability of the connection structure between the locking hook and the housing.

[0019] In one embodiment, the number of locking hooks is configured to be two, and the two locking hooks are arranged side by side. The through groove has two openings arranged opposite to each other, and each opening corresponds to one locking hook.

[0020] Under the action of the driving component, the two locking hooks can move synchronously to switch positions between the first position and the second position.

[0021] Understandably, when the locking hook switches from the first position to the second position, its hook can extend out of the opening to form a clamping gap with the material placement table and clamp the battery. Setting two locking hooks and making them move synchronously can lock the opposite sides of the positioning hole at the same time, increasing the locking force and stability of the box used to lock the battery.

[0022] In one embodiment, the support is provided with a mounting groove and a second shaft hole communicating with the mounting groove, and the locking hook is provided with a third shaft hole at the end away from the hook portion;

[0023] The locking hook passes through the second shaft hole and the third shaft hole via the second rotating shaft to be rotatably connected to the support.

[0024] In one embodiment, a positioning seat is provided at the end of the housing away from the drive member, the channel extends to the positioning seat, and the through groove and the material placement platform are both located on the positioning seat.

[0025] In one embodiment, a positioning ring is provided inside the positioning seat, and a positioning groove is provided at the end of the housing away from the driving member, and the positioning ring can be inserted into the positioning groove for positioning engagement.

[0026] Understandably, by inserting and positioning the positioning ring and positioning groove, the positioning seat can be confined to the housing, preventing it from wobbling in the direction perpendicular to the central axis of the housing, thus ensuring the stability of the connection and positioning.

[0027] In one embodiment, the positioning base is detachably connected to the housing.

[0028] Understandably, the detachable connection method makes the airtightness testing self-locking device easy to disassemble, repair, and store.

[0029] This application also provides the following technical solutions:

[0030] A battery airtightness testing system includes a bracket, an airtightness testing fixture, and the airtightness testing self-locking device described in the above embodiments.

[0031] The airtightness testing fixture is mounted on the support, and the airtightness testing self-locking device is located on the side of the support for locking the battery onto the airtightness testing fixture.

[0032] Understandably, the battery can be placed on the airtightness testing fixture and locked in place by the airtightness testing self-locking device on the side of the bracket to facilitate the testing of the battery's airtightness.

[0033] Compared with existing technologies, the aforementioned airtightness detection self-locking device, by setting a locking hook assembly and using a driving component to switch the locking hook assembly between a first position and a second position, achieves automatic clamping and locking of the box body without manual operation, thereby improving the efficiency of battery airtightness detection. Furthermore, the automatic clamping force can be controlled. Simultaneously, when the locking hook assembly is in the first position, the end of the housing away from the driving component can pass through the positioning hole, achieving primary positioning of the box body. When the locking hook assembly is in the second position, a clamping gap is formed between the hook and the material placement platform, achieving secondary positioning of the box body. Thus, by utilizing the characteristics of the locking hook assembly to perform two positioning operations on the box body, the locking of the box body becomes more stable. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the battery airtightness testing system provided in this application.

[0036] Figure 2 This is a schematic diagram of the airtightness detection self-locking device provided in this application.

[0037] Figure 3This is a cross-sectional structural schematic diagram of the airtightness detection self-locking device provided in this application.

[0038] Figure 4 This is a cross-sectional structural schematic diagram of the airtightness testing self-locking device provided in this application from another angle.

[0039] Figure 5 A schematic diagram of the positioning seat provided in this application.

[0040] Figure 6 This is a structural schematic diagram of the positioning seat provided in this application from another angle.

[0041] Figure 7 A schematic diagram of the support provided in this application.

[0042] Figure 8 A schematic diagram of the locking hook provided in this application.

[0043] 100. Air tightness testing self-locking device; 10. Drive component; 11. Cylinder; 12. Speed ​​control valve; 20. Housing; 21. Channel; 22. Material placement platform; 23. Through groove; 231. Opening; 24. First shaft hole; 25. Annular groove; 251. Retaining ring; 26. Positioning seat; 261. Positioning ring; 27. Positioning groove; 30. Locking hook assembly; 31. Hook; 32. Clamping gap; 33. Support; 331. Mounting groove; 332. Second shaft hole; 34. Locking hook; 341. First hole; 342. Second hole; 343. First rotating shaft; 344. Third shaft hole; 35. Second rotating shaft;

[0044] 200. Battery airtightness testing system; 201. Bracket; 202. Airtightness testing fixture. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0050] Please see Figure 1 This application provides a battery airtightness testing system 200, including a bracket 201, an airtightness testing fixture 202, and an airtightness testing self-locking device 100. The airtightness testing fixture 202 is mounted on the bracket 201, and the airtightness testing self-locking device 100 is disposed on the side of the bracket 201 to lock the battery onto the airtightness testing fixture 202 for airtightness testing. Here, the battery generally includes a housing, and components such as battery cells are housed within the housing. Preferably, the airtightness testing self-locking device 100 is used to lock the housing onto the airtightness testing fixture 202.

[0051] For details, please refer to Figures 2 to 8 The housing has positioning holes. The airtightness testing self-locking device 100 includes a driving component 10, a housing 20, and a locking hook assembly 30. One end of the housing 20 is installed on the driving component 10, and a channel 21 is provided inside. The end of the housing 20 away from the driving component 10 is provided with a material placement platform 22 and a through groove 23 communicating with the channel 21. The material placement platform 22 is located at the opening 231 of the through groove 23. The locking hook assembly 30 is disposed inside the housing 20, and one end of the locking hook assembly 30 is connected to the driving component 10, while the other end extends along the channel 21 and has a hook portion 31. The locking hook assembly 30 has a first position and a second position. The driving member 10 can drive the locking hook assembly 30 to move within the channel 21 so that the locking hook assembly 30 switches between the first position and the second position. When the locking hook assembly 30 is in the first position, the end of the housing 20 away from the driving member 10 can pass through the positioning hole and allow the material placement table 22 to abut against one side of the box. When the locking hook assembly 30 is in the second position, the hook 31 moves to the opening 231 and abuts against one side of the box so that a clamping gap 32 can be formed between it and the material placement table 22 to clamp the box.

[0052] Understandably, this application achieves automatic clamping and locking of the box body by setting a locking hook assembly 30 and switching the locking hook assembly 30 between a first position and a second position via a driving component 10, eliminating the need for manual operation and thus improving the efficiency of battery airtightness testing. Furthermore, the automatic clamping force can be controlled. Simultaneously, when the locking hook assembly 30 is in the first position, the end of the housing 20 away from the driving component 10 can pass through the positioning hole, achieving primary positioning of the box body. When the locking hook assembly 30 is in the second position, a clamping gap 32 is formed between the hook 31 and the material placement table 22, achieving secondary positioning of the box body. Thus, by utilizing the characteristics of the locking hook assembly 30 to perform two positioning operations on the box body, the locking of the box body becomes more stable.

[0053] In the first position, the airtightness detection self-locking device 100 is in the unlocked state. At this time, the locking hook assembly 30 can be received into the through groove 23 to facilitate the positioning hole to pass through the locking hook assembly 30 and to make one side of the box abut against the material placement table 22. In the second position, the airtightness detection self-locking device 100 is in the locked state. At this time, as the hook 31 moves out of the opening and forms a clamping gap 32 with the material placement table 22, the box is clamped and fixed.

[0054] like Figure 2 As shown, the drive unit 10 includes a cylinder 11 and a speed control valve 12. The cylinder 11 is connected to the housing 20, and the speed control valve 12 is installed on the side of the cylinder 11. The connection position between the cylinder 11 and the speed control valve 12 is not limited to this and can be determined according to the actual situation, which will not be elaborated here.

[0055] like Figures 3 to 6 As shown, the housing 20 has a first shaft hole 24 and an annular groove 25. The first shaft hole 24 communicates with the channel 21 and is used to fix the locking hook assembly 30. The annular groove 25 is located on the outer wall of the housing 20 and surrounds the circumference of the first shaft hole 24. A retaining ring 251 is provided in the annular groove 25 to improve the stability of the connection between the locking hook assembly 30 and the housing 20.

[0056] In one embodiment, a positioning seat 26 is provided at the end of the housing 20 away from the drive member 10, the channel 21 extends to the positioning seat 26, and the through groove 23 and the material placement platform 22 are both located on the positioning seat 26.

[0057] Furthermore, a positioning ring 261 is provided inside the positioning seat 26, and a positioning groove 27 is provided at the end of the housing 20 away from the driving member 10. The positioning ring 261 can be inserted into the positioning groove 27 for positioning engagement. Through the insertion and positioning engagement of the positioning ring 261 and the positioning groove 27, the positioning seat 26 can be restricted to the housing 20, preventing it from wobbling in the direction perpendicular to the central axis of the housing 20, thereby ensuring the stability of the connection positioning.

[0058] Preferably, the positioning seat 26 is detachably connected to the housing 20 so that the airtightness detection self-locking device 100 can be disassembled and maintained. Here, the positioning seat 26 and the housing 20 can be detachably connected by bolts, clips, or other components.

[0059] Please continue to refer to this. Figures 3 to 8 The locking hook assembly 30 includes a support 33 and a locking hook 34. The support 33 is fixed to the output shaft of the drive member 10, and the locking hook 34 extends along the channel 21. One end of the locking hook 34 is rotatably connected to the support 33, and the other end is provided with a hook portion 31. In this way, the drive member 10 can drive the support 33 to move the locking hook 34 within the channel 21, and when the locking hook assembly 30 needs to move to the first position, the locking hook 34 can rotate relative to the support 33 without restriction.

[0060] Furthermore, the locking hook 34 has a first hole 341 and a second hole 342 that are interconnected. The first hole 341 extends along the axial direction of the channel 21, and the second hole 342 is set at an angle to the first hole 341 and extends away from the axial direction of the channel 21. The locking hook assembly 30 also includes a first rotating shaft 343, which is fixed to the housing 20. The first rotating shaft 343 passes through the first shaft hole 24 and is inserted into the first hole 341. The retaining ring 251 is sleeved on the first rotating shaft 343 to prevent the first rotating shaft 343 from falling out of the first shaft hole 24, so as to achieve a stable connection between the locking hook 34 and the housing 20.

[0061] Here, in response to the action of the drive member 10, the first rotating shaft 343 can switch positions between the first hole 341 and the second hole 342 to cause the locking hook 34 to switch positions between the first position and the second position. When the locking hook assembly 30 is in the second position, the first rotating shaft 343 is located in the second hole 342. Thus, the first hole 341 ensures that the locking hook 34 moves along the axial direction of the channel 21, enabling it to move to the second position to achieve the locking function. The second hole 342 ensures that the locking hook 34 moves towards the axial direction of the channel 21, enabling it to move to the first position to release the lock.

[0062] Preferably, two locking hooks 34 are configured, and the two locking hooks 34 are arranged side by side. The through groove 23 has two openings 231 arranged opposite each other, and each opening 231 corresponds to one locking hook 34. Under the action of the driving member 10, the two locking hooks 34 can move synchronously to switch positions between the first position and the second position. It can be understood that when the locking hook 34 switches from the first position to the second position, its hook part 31 can extend out of the opening 231 to form a clamping gap 32 with the material placement table 22 and clamp the battery. Setting two locking hooks 34 and making them move synchronously can lock the opposite sides of the positioning hole at the same time, increasing the locking force and stability of the battery case.

[0063] Here, the number of locking hooks 34 is not limited to two; it can be set to multiple, such as two, three, or five. The specific number can be determined according to the actual situation, and the number of locking hooks 34 corresponds one-to-one with the number of openings 231.

[0064] For example, the support 33 has an installation groove 331 and a second shaft hole 332 communicating with the installation groove 331, and the locking hook 34 has a third shaft hole 344 at the end away from the hook part 31; the locking hook 34 passes through the second shaft 35 through the second shaft hole 332 and the third shaft hole 344 to be rotatably connected to the support 33.

[0065] The working process of the airtightness detection self-locking device 100 in this application is as follows:

[0066] In the initial state, the locking hook 34 is in the first position, that is, it is housed in the channel 21, and the first rotating shaft 343 is housed in the second hole 342.

[0067] When the airtightness testing self-locking device 100 is needed to clamp the battery case, firstly, the cylinder 11 positions the locking hook 34 in the first position, with the end of the housing 20 away from the drive member 10 passing through the positioning hole, allowing the material placement platform 22 to abut against one side of the case. Then, the cylinder 11 drives the support 33 to slide inside the housing 20. As the support 33 slides, it can move the locking hook 34 via the second rotating shaft 35. Simultaneously, the first rotating shaft 343 moves from the second hole 342 to the first hole 341, causing the locking hook 34 to extend from the opening 231 of the channel 21 under the action of the first hole 341, forming a clamping gap 32 between the locking hook 34 and the material placement platform 22. At this point, the locking hook 34 is in the second position, thus achieving clamping of the case (see reference). Figure 4 ).

[0068] When it is necessary to release the clamping force on the box, the cylinder 11 drives the support 33 to slide inside the housing 20. When the support 33 slides, it can drive the locking hook 34 to rotate through the second rotating shaft 35. At the same time, the first rotating shaft 343 moves from the first hole 341 to the second hole 342. Thus, under the action of the second hole 342, the locking hook 34 retracts from the opening 231 of the channel 21 back to the channel 21 (that is, it switches from the second position to the first position). At this time, the hook 31 no longer applies clamping force to the box, and then the positioning hole on the box is disengaged from the housing 20.

[0069] Here, the automatic locking of the battery is achieved through the control of the cylinder 11, which ensures that the locking force is consistent each time, thereby ensuring the accuracy of the battery airtightness test results. The airtightness detection self-locking device 100 can also be used in conjunction with the control system and pressure sensor to adjust the locking force and speed of the cylinder 11 according to the preset program, and detect the signal of the pressure sensor to ensure the precise movement of the cylinder 11.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. An airtightness detection self-locking device for locking a battery housing, wherein the housing has a positioning hole, characterized in that, The airtightness detection self-locking device includes: Drive component (10); A housing (20) is mounted at one end to the drive member (10) and has a channel (21) inside. A material placement platform (22) is provided at the end of the housing (20) away from the drive member (10), and a through groove (23) communicating with the channel (21) is provided. The material placement platform (22) is located at the opening (231) of the through groove (23). A locking hook assembly (30) is disposed within the housing (20), and one end of the locking hook assembly (30) is connected to the drive member (10), and the other end extends along the channel (21) and has a hook portion (31); and the locking hook assembly (30) has a first position and a second position, and the drive member (10) is capable of driving the locking hook assembly (30) to move within the channel (21) so that the locking hook assembly (30) switches between the first position and the second position; When the locking hook assembly (30) is in the first position, the end of the housing (20) away from the drive member (10) can pass through the positioning hole, and the material placement table (22) can abut against one side of the box body; when the locking hook assembly (30) is in the second position, the hook (31) moves to the opening (231) and abuts against one side of the box body, so as to form a clamping gap (32) with the material placement table (22) and clamp the box body.

2. The airtightness detection self-locking device according to claim 1, characterized in that, The locking hook assembly (30) includes a support (33) and a locking hook (34). The support (33) is fixed on the output shaft of the drive (10). The locking hook (34) extends along the channel (21), and one end of the locking hook (34) is rotatably connected to the support (33), while the other end is provided with the hook portion (31).

3. The airtightness detection self-locking device according to claim 2, characterized in that, The locking hook assembly (30) further includes a first rotating shaft (343). The locking hook (34) has a first hole (341) and a second hole (342) that are interconnected. The first hole (341) extends along the axial direction of the channel (21), and the second hole (342) is set at an angle to the first hole (341) and extends in an axial direction away from the channel (21). The first rotating shaft (343) is fixed to the housing (20) and passes through the first hole (341). In response to the action of the drive member (10), the first rotating shaft (343) can switch positions between the first hole (341) and the second hole (342) to cause the locking hook (34) to switch positions between the first position and the second position, and when the locking hook assembly (30) is in the second position, the first rotating shaft (343) is in the second hole (342).

4. The airtightness detection self-locking device according to claim 3, characterized in that, The housing (20) has a first shaft hole (24) and an annular groove (25). The first shaft hole (24) communicates with the channel (21). The annular groove (25) is located on the outer wall of the housing (20) and surrounds the circumference of the first shaft hole (24). The first rotating shaft (343) passes through the first shaft hole (24) and through the first hole (341). A retaining ring (251) is provided in the annular groove (25), and the retaining ring (251) is sleeved on the first rotating shaft (343).

5. The airtightness detection self-locking device according to claim 2, characterized in that, The number of locking hooks (34) is configured to be two, and the two locking hooks (34) are arranged side by side. The through groove (23) has two openings (231) arranged opposite to each other, and each opening (231) corresponds to one locking hook (34). Under the action of the drive member (10), the two locking hooks (34) can move synchronously to switch positions between the first position and the second position.

6. The airtightness detection self-locking device according to claim 2, characterized in that, The support (33) is provided with an installation groove (331) and a second shaft hole (332) communicating with the installation groove (331). The locking hook (34) is provided with a third shaft hole (344) at one end away from the hook part (31). The locking hook (34) passes through the second shaft (35) and the second shaft hole (332) and the third shaft hole (344) to be rotatably connected to the support (33).

7. The airtightness detection self-locking device according to claim 2, characterized in that, A positioning seat (26) is provided at one end of the housing (20) away from the driving member (10), the channel (21) extends to the positioning seat (26), and the through groove (23) and the material placement platform (22) are both located on the positioning seat (26).

8. The airtightness detection self-locking device according to claim 7, characterized in that, The positioning seat (26) is provided with a positioning ring (261), and the housing (20) is provided with a positioning groove (27) at one end away from the driving member (10). The positioning ring (261) can be inserted into the positioning groove (27) and positioned.

9. The airtightness detection self-locking device according to claim 7, characterized in that, The positioning seat (26) is detachably connected to the housing (20).

10. A battery airtightness detection system, characterized in that, It includes a bracket (201), an airtightness testing fixture (202), and an airtightness testing self-locking device (100) as described in any one of claims 1-9; The air tightness testing fixture (202) is mounted on the bracket (201), and the air tightness testing self-locking device (100) is mounted on the side of the bracket (201) for locking the battery onto the air tightness testing fixture (202).

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