Battery cover plate air tightness detection mechanism

Abstract

The utility model provides a kind of battery cover plate air tightness detection mechanism, including pressing mechanism and lower cavity assembly;Pressing mechanism includes upper sealing block, and the side surface of upper sealing block towards lower cavity assembly is provided with upper groove, and upper groove is configured with cover plate pressing block in it;Lower cavity assembly includes lower sealing block, and the side surface of lower sealing block towards pressing mechanism is configured with lower groove corresponding to upper groove, and sealing sleeve is assembled in lower groove, and the circumferential side of lower groove is provided with cover plate fixture, battery cover plate is assembled in cover plate fixture, battery cover plate is between sealing sleeve and cover plate pressing block, upper sealing block can be close to or away from lower sealing block;Sealing sleeve inner wall and battery cover plate constitute detection lower cavity, upper groove inner wall, sealing sleeve outer wall, the side surface of lower sealing block towards upper sealing block and battery cover plate constitute detection upper cavity, detection lower cavity is connected with helium detector, and detection upper cavity is connected with helium source.The utility model eliminates the lengthy detection pipeline of existing detection mechanism, and equipment is high.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cover airtightness testing mechanism. Background Technology

[0002] In the manufacturing process of cylindrical battery covers in the new energy industry, airtightness testing is a crucial step. However, current airtightness testing institutions in the industry often suffer from problems such as too many air pipe connections leading to poor airtightness, complex air paths making it difficult to troubleshoot anomalies, or the inability to quickly change tooling fixtures, which indirectly affect the overall machine uptime. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a battery cover airtightness detection mechanism, which has a simple structure and a high operating rate.

[0004] The embodiments of this utility model are achieved through the following technical solutions: A battery cover airtightness testing mechanism includes a clamping mechanism and a lower cavity assembly. The clamping mechanism includes an upper sealing block with an upper groove on one side facing the lower cavity assembly, and a cover plate pressing block is disposed within the upper groove. The lower cavity assembly includes a lower sealing block with a lower groove corresponding to the upper groove on one side facing the clamping mechanism, a sealing sleeve is fitted within the lower groove, and a cover plate fixture is disposed around the lower groove. A battery cover is fitted onto the cover plate fixture, and the battery cover is positioned between the sealing sleeve and the cover plate pressing block. The upper sealing block can be close to or away from the lower sealing block. The inner wall of the sealing sleeve and the battery cover form a lower testing cavity. The inner wall of the upper groove, the outer wall of the sealing sleeve, the side of the lower sealing block facing the upper sealing block, and the battery cover form an upper testing cavity. A helium detector is connected externally to the lower testing cavity, and a helium source is connected externally to the upper testing cavity. This airtightness testing mechanism eliminates the lengthy testing pipelines of existing testing mechanisms. By setting a sealing sleeve, it improves the high-quality sealing of the testing chamber formed by the merging of the clamping mechanism and the lower cavity assembly. The structure is simple, which helps to shorten the airtightness testing time of the battery cover, speed up the response speed of the testing mechanism, and at the same time helps to reduce the failure rate and subsequent maintenance costs of the testing mechanism, significantly improving the uptime of the airtightness testing mechanism.

[0005] According to a preferred embodiment, the lower sealing block includes a base block and an assembly block. The base block has a detection air passage, and a first through hole is disposed on one side of the base block facing the assembly block. The first through hole communicates with the detection air passage. A lower groove hole is disposed through the assembly block. The assembly block is fitted and assembled with the base block. The wall of the lower groove hole and the base block form the lower groove. The first through hole communicates with the lower groove hole.

[0006] According to a preferred embodiment, a second sealing groove is provided on one side of the base block facing the assembly block, the first through hole is provided at the bottom of the second sealing groove, and the sealing sleeve is embedded in the second sealing groove.

[0007] According to a preferred embodiment, the sealing sleeve includes a main sleeve, and a shoulder ring is provided at the lower end of the main sleeve. The outer diameter of the shoulder ring is larger than the outer diameter of the main sleeve. The shoulder ring is embedded in the second sealing groove, and the main sleeve is embedded in the lower groove hole. The shoulder ring is located between the bottom inner side of the second sealing groove and the side of the assembly block facing the base block.

[0008] According to a preferred embodiment, a second sealing ring is provided on one side of the shoulder ring facing the inner side of the bottom of the second sealing groove, and the second sealing ring is coaxial with the shoulder ring.

[0009] According to a preferred embodiment, a third sealing ring is provided at one end of the main sleeve facing the battery cover, and the third sealing ring is coaxial with the main sleeve.

[0010] According to a preferred embodiment, the cover plate fixture includes at least two limiting blocks, which are spaced apart circumferentially along the sealing sleeve; the limiting blocks are mounted on the assembly block; the limiting blocks have a guide surface on the side facing the sealing sleeve, the guide surface including an assembly surface and a limiting surface connected to each other, and the distance between the assembly surface and the central axis of the sealing sleeve gradually decreases in the axial direction of the sealing sleeve and in the direction from the assembly block toward the base block.

[0011] According to a preferred embodiment, the assembly surface is a conical surface; the limiting surface is a cylindrical surface; and both the assembly surface and the limiting surface are coaxial with the sealing sleeve.

[0012] According to a preferred embodiment, the cover plate fixture further includes a limiting plate disposed on the assembly block; the assembly block is provided with a first mounting groove and a second mounting groove, the first mounting groove being used to assemble the limiting block, and the second mounting groove being used to assemble the limiting plate; an annular recess is provided at one end of the assembly block near the upper sealing block at the lower slot hole, the annular recess passing through the second mounting groove and all the first mounting grooves, and the annular recess communicating with the lower slot hole.

[0013] According to a preferred embodiment, the upper sealing block is provided with a third connecting air passage, and the bottom inner side of the upper groove is provided with a fifth through hole, which connects to the third connecting air passage; a sixth through hole is provided through the cover plate pressure block, which connects to the fifth through hole, and a guide groove is provided on the side of the cover plate pressure block facing the lower cavity assembly, which connects to the sixth through hole, and the guide groove is used to connect the detection upper cavity and the sixth through hole. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A three-dimensional structural schematic diagram of the battery cover airtightness testing mechanism provided in an embodiment of this utility model; Figure 2 A front view schematic diagram of the battery cover airtightness testing mechanism provided in an embodiment of this utility model; Figure 3 An exploded view of the assembly structure of the integrated plate and the lower sealing block provided in this embodiment of the utility model; Figure 4 A three-dimensional structural diagram of the integrated board provided in an embodiment of this utility model; Figure 5 A three-dimensional structural diagram of the lower sealing block after assembling the battery cover plate is provided for an embodiment of this utility model; Figure 6 An exploded view of the assembly structure of the upper sealing block and the lower sealing block provided in this embodiment of the utility model; Figure 7 An exploded structural diagram of the assembly structure of the upper sealing block and the cover plate pressure block provided in this embodiment of the utility model; Figure 8 A three-dimensional structural schematic diagram of the upper sealing block provided for an embodiment of this utility model; Figure 9 A cross-sectional view of the upper sealing block and the lower sealing block after assembly, provided in an embodiment of this utility model; Figure 10 A first three-dimensional structural schematic diagram of the sealing sleeve provided in an embodiment of this utility model; Figure 11 This is a schematic diagram of the second three-dimensional structure of the sealing sleeve provided in an embodiment of the present utility model; Figure 12An exploded structural diagram of the assembly block, cover plate fixture, and sealing assembly structure provided in this embodiment of the utility model; Figure 13 This is a three-dimensional structural diagram of the base block provided in an embodiment of the present utility model.

[0016] Icons: 1. Clamping mechanism; 11. Upper sealing block; 111. Upper groove; 112. Cover plate pressing block; 1121. Sixth through hole; 1122. Air guide groove; 113. Third connecting air passage; 114. Fifth through hole; 12. Gantry frame; 13. Second cylinder; 14. Assembly plate; 15. Guide shaft; 2. Lower cavity assembly; 21. Integrated plate; 211. Third through hole; 212. Second connecting air passage; 213. Fourth through hole; 22. Lower sealing block; 221. Base block; 2210. Detection air passage; 2211. Second sealing groove; 2212. First through hole; 2213. First connecting air passage; 2214. Second through hole; 222. Assembly block; 2220. Lower groove ; 2221, Lower slot hole; 2222, First sealing groove; 2223, First mounting groove; 2224, Second mounting groove; 2225, Annular recess; 2226, Second anti-foolproof surface; 23, Linear module; 24, Exhaust module; 241, Exhaust block; 2411, Air extraction hole; 2412, Adapter; 242, First cylinder; 3, First sealing ring; 4, Sealing sleeve; 41, Main sleeve; 411, Third sealing ring; 412, First anti-foolproof surface; 42, Shoulder ring; 421, Second sealing ring; 5, Cover plate fixture; 51, Limiting block; 511, Assembly surface; 512, Limiting surface; 52, Limiting plate; a, Battery cover plate; b, Upper detection cavity; c, Lower detection cavity. Detailed Implementation

[0017] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0018] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0020] Please refer to Figures 1 to 13 A battery cover airtightness testing mechanism includes a clamping mechanism 1 and a lower cavity assembly 2. The clamping mechanism 1 and the lower cavity assembly 2 are pressed together to form a testing chamber. The battery cover a divides the testing chamber into an independent upper testing chamber b and a lower testing chamber c. A helium gas source (not shown in the figure) is connected to the upper testing chamber b, and a helium detector (not shown in the figure) is connected to the lower testing chamber c. In use, helium gas is introduced into the upper testing chamber b. If the helium detector does not detect helium gas in the lower testing chamber c, it proves that the battery cover a has good airtightness; conversely, if the helium detector detects helium gas in the lower testing chamber c, it proves that the battery cover a has poor airtightness and is unqualified.

[0021] Specifically, such as Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, the pressing mechanism 1 includes an upper sealing block 11. An upper groove 111 is provided on one side of the upper sealing block 11 facing the lower cavity assembly 2. A cover plate pressing block 112 is disposed in the upper groove 111.

[0022] like Figure 5 and Figure 6 As shown, the lower cavity assembly 2 includes a lower sealing block 22. A lower groove 2220 corresponding to the upper groove 111 is arranged on the side of the lower sealing block 22 facing the pressing mechanism 1. A sealing sleeve 4 is installed inside the lower groove 2220. A cover plate fixture 5 is arranged around the lower groove 2220. A battery cover plate a is assembled in the cover plate fixture 5, and the battery cover plate a is located between the sealing sleeve 4 and the cover plate pressing block 112. The upper sealing block 11 can approach or move away from the lower sealing block 22. Specifically... Figure 9 As shown, the inner wall of the sealing sleeve 4 and the battery cover a form the lower detection cavity c, and the inner wall of the upper groove 111, the outer wall of the sealing sleeve 4, the side of the lower sealing block 22 facing the upper sealing block 11, and the battery cover a form the upper detection cavity b. In this embodiment, a first sealing ring 3 is arranged on the side of the assembly block 222 facing the upper sealing block 11, and the lower groove 2220 is located inside the first sealing ring 3. Thus, when the pressing mechanism 1, i.e., the upper sealing block 11, moves towards the assembly block 222, the upper sealing block 11 adheres to and squeezes the first sealing ring 3 to cooperate with the assembly block 222 to achieve a seal in the inner area of ​​the first sealing ring 3. This airtightness testing mechanism eliminates the lengthy testing pipeline of existing testing mechanisms. By setting the sealing sleeve 4, it improves the high-quality sealing of the testing cavity formed by the merging of the pressing mechanism 1 and the lower cavity assembly 2. The structure is simple, which helps to shorten the airtightness testing time of the battery cover a, speed up the response speed of the testing mechanism, and at the same time helps to reduce the failure rate and later maintenance cost of the testing mechanism, significantly improving the uptime of the airtightness testing mechanism.

[0023] Preferably, such as Figure 6As shown, the assembly block 222 is provided with a first sealing groove 2222, and the first sealing ring 3 is assembled in the first sealing groove 2222.

[0024] Furthermore, the lower sealing block 22 includes a base block 221 and an assembly block 222. The base block 221 has a detection air passage 2210. A first through hole 2212 is disposed on the side of the base block 221 facing the assembly block 222, connecting to the detection air passage 2210. A lower slot hole 2221 is provided through the assembly block 222. The assembly block 222 is fitted to the base block 221. The wall of the lower slot hole 2221 and the base block 221 form a lower groove 2220. The first through hole 2212 communicates with the lower slot hole 2221. The lower sealing block 22 adopts a split design, facilitating molding and subsequent maintenance.

[0025] Furthermore, such as Figure 6 and Figure 9 As shown, a second sealing groove 2211 is provided on the side of the base block 221 facing the assembly block 222, and a first through hole 2212 is provided at the bottom of the second sealing groove 2211. The sealing sleeve 4 is embedded in the second sealing groove 2211. The second sealing groove 2211 facilitates the assembly of the sealing sleeve 4 and the lower sealing block 22.

[0026] like Figure 9 , Figure 10 and Figure 11 As shown, the sealing sleeve 4 includes a main sleeve 41, and a shoulder ring 42 is provided at the lower end of the main sleeve 41. The outer diameter of the shoulder ring 42 is larger than the outer diameter of the main sleeve 41. The shoulder ring 42 is embedded in the second sealing groove 2211, and the main sleeve 41 is embedded in the lower groove hole 2221. The shoulder ring 42 is located between the bottom inner side of the second sealing groove 2211 and the side of the assembly block 222 facing the base block 221. In use, the sealing sleeve 4 is first assembled into the second sealing groove 2211. Specifically, the shoulder ring 42 is embedded into the second sealing groove 2211. Then, the assembly block 222 is assembled with the base block 221, so that the main sleeve 41 is embedded into the lower groove hole 2221. The assembly block 222 applies pressure to the shoulder ring 42. Under the combined left and right pressure of the assembly block 222 and the base block 221, the lower end of the main sleeve 41, that is, the lower end of the sealing sleeve 4, is fully and tightly fitted with the bottom inner side of the second sealing groove 2211, which helps to ensure the sealing performance of the lower cavity c.

[0027] like Figure 9 and Figure 11 As shown, preferably, a second sealing ring 421 is provided on one side of the shoulder ring 42 facing the inner side of the bottom of the second sealing groove 2211, and the second sealing ring 421 is coaxial with the shoulder ring 42.

[0028] like Figure 9 and Figure 10As shown, preferably, a third sealing ring 411 is provided at the end of the main sleeve 41 facing the battery cover a, and the third sealing ring 411 is coaxial with the main sleeve 41. In use, the battery cover a is pressed against the third sealing ring 411 by the cover plate pressing block 112, thereby effectively separating the detection lower cavity c.

[0029] Preferably, the main sleeve 41, the shoulder ring 42, the second sealing ring 421, and the third sealing ring 411 are integrally formed. In this embodiment, the sealing sleeve 4 is made of rubber and has a certain elastic deformation capability.

[0030] like Figure 5 , Figure 6 and Figure 12 As shown, the cover plate fixture 5 includes at least two limiting blocks 51, which are spaced apart circumferentially along the sealing sleeve 4; the limiting blocks 51 are mounted on the assembly block 222; the limiting blocks 51 have a guide surface on the side facing the sealing sleeve 4, and the guide surface includes an assembly surface 511 and a limiting surface 512 that are connected to each other; in the axial direction of the sealing sleeve 4 and from the assembly block 222 toward the base block 221, the distance between the assembly surface 511 and the central axis of the sealing sleeve 4 gradually decreases.

[0031] Preferably, the assembly surface 511 is a conical surface, and the limiting surface 512 is a cylindrical surface. Both the assembly surface 511 and the limiting surface 512 are coaxial with the sealing sleeve 4.

[0032] The cover fixture 5 also includes a limiting plate 52, which is disposed on the assembly block 222. The limiting plate 52 is used to support the current collector of the battery cover a.

[0033] In this embodiment, the third sealing ring 411 is D-shaped, and its straight section is located between the center of the battery cover a and the injection hole.

[0034] In this embodiment, the side wall of the main sleeve 41 is provided with a first anti-foolproof surface 412, and the inner wall of the lower slot 2221 is provided with a second anti-foolproof surface 2226 that matches the first anti-foolproof surface 412. Optionally, both the first anti-foolproof surface 412 and the second anti-foolproof surface 2226 are planar, which is beneficial for the rapid assembly of the sealing sleeve 4.

[0035] like Figure 12 As shown, the assembly block 222 is provided with a first mounting groove 2223 and a second mounting groove 2224. The first mounting groove 2223 is used to assemble the limiting block 51, and the second mounting groove 2224 is used to assemble the limiting plate 52. An annular recess 2225 is provided at one end of the lower slot hole 2221 near the upper sealing block 11. The annular recess 2225 passes through the second mounting groove 2224 and all the first mounting grooves 2223, and the annular recess 2225 is connected to the lower slot hole 2221.

[0036] Optionally, the assembly block 222 is provided with two or more lower slots 2221, thereby enabling the detection of two or more battery cover plates a.

[0037] Furthermore, such as Figure 3 , Figure 4 and Figure 13 As shown, the lower cavity assembly 2 also includes an integrated plate 21, and four lower sealing blocks 22 are assembled on the integrated plate 21. This enables the detection of eight battery cover plates a. A first connecting air passage 2213 is provided in the base block 221 to connect two first through holes 2212 on the base block 221. A second through hole 2214 is provided on the lower side of the base block 221, and the second through hole 2214 connects to the first connecting air passage 2213. Four third through holes 211 are provided on the side of the integrated plate 21 facing the base block 221. A second connecting air passage 212 is provided in the integrated plate 21 to connect the four third through holes 211 in series. The four third through holes 211 correspond one-to-one with the four lower sealing blocks 22. Specifically, the third through hole 211 connects with the second through hole 2214 on the corresponding lower sealing block 22. In some embodiments, a fourth through hole 213 is provided on the lower side of the integrated plate 21, and the fourth through hole 213 is connected to the second connecting air passage 212. Specifically, the fourth through hole 213, the second connecting air passage 212, the third through hole 211, the second through hole 2214, the first connecting air passage 2213 and the first through hole 2212 are connected in sequence to form a passage, which is connected to the inner cavity of the sealing sleeve 4, that is, the detection lower cavity c. Helium gas in the detection lower cavity c can be detected by connecting an external helium detector at the fourth through hole 213.

[0038] In this embodiment, the lower cavity assembly 2 also includes a linear module 23, and the integrated plate 21 is assembled on the linear module 23 to achieve spatial position adjustment relative to the pressing mechanism 1.

[0039] In this embodiment, as Figure 1 and Figure 2 As shown, the lower cavity assembly 2 also includes an exhaust module 24, which includes an exhaust block 241 and a first cylinder 242. When the integrated plate 21 is in the testing position, the exhaust block 241 is located below the integrated plate 21. The exhaust block 241 is mounted on the first cylinder 242, which drives the exhaust block 241 to abut against or detach from the integrated plate 21 in a vertical direction. Further, as... Figure 1As shown, the exhaust block 241 is equipped with an extraction hole 2411. When the exhaust block 241 abuts against the integrated plate 21, the inlet end of the extraction hole 2411 is connected to the fourth through hole 213, and the outlet end of the extraction hole 2411 is externally connected to an adapter 2412, which is connected to the helium detector. This arrangement facilitates the adjustment of the position of the integrated plate 21, or the lower sealing block 22, via the linear module 23, avoids interference from the clamping mechanism 1, and facilitates the loading and unloading of the battery cover a.

[0040] like Figure 1 and Figure 2 As shown, the clamping mechanism 1 also includes a gantry frame 12 and an assembly plate 14. The lower cavity assembly 2 is located below the gantry frame 12. A second cylinder 13 is mounted on the gantry frame 12. A guide shaft 15 is provided on the assembly plate 14, passing through the gantry frame 12 and slidably connected thereto. The guide shaft 15 extends vertically. The second cylinder 13 is connected to the assembly plate 14 and can drive the assembly plate 14 to move vertically towards or away from the lower cavity assembly 2. The upper sealing block 11 is mounted on the integrated plate 21. In use, the second cylinder 13 drives the upper sealing block 11 to move towards or away from the lower sealing block 22.

[0041] Furthermore, such as Figure 7 , Figure 8 and Figure 9 As shown, a third connecting air passage 113 is configured inside the upper sealing block 11, and a fifth through hole 114 is provided on the bottom inner side of the upper groove 111, which connects to the third connecting air passage 113. That is, the third connecting air passage 113 is used to connect the fifth through holes 114 in the two upper grooves 111. Furthermore, a sixth through hole 1121 is provided through the cover plate pressing block 112, which connects to the fifth through hole 114. A gas guide groove 1122 is provided on the side of the cover plate pressing block 112 facing the lower cavity assembly 2, connecting to the sixth through hole 1121. The gas guide groove 1122 connects the detection upper cavity b and the sixth through hole 1121. In use, a helium source is connected to the third connecting air passage 113, and helium is introduced into the detection upper cavity b through the third connecting air passage 113, the fifth through hole 114, the sixth through hole 1121, and the gas guide groove 1122.

[0042] In this embodiment, the upper sealing block 11 and the assembly block 222 are positioned by a pin, and the assembly block 222 and the base block 221 are also positioned by a pin.

[0043] It should be noted that this airtightness testing device is a preliminary inspection unit, testing eight battery cover plates (a) at a time. If a non-compliant (NG) result is found, all eight battery cover plates (a) in the same batch will be re-inspected one by one to determine which specific battery cover plate (a) requires NG. This improves testing efficiency. The re-inspection equipment operates on the same principle as the preliminary inspection equipment, the difference being that it only tests one battery cover plate (a) at a time. Therefore, the structural design only needs to accommodate the testing of one battery cover plate (a). For details, please refer to the previous text; further elaboration will not be repeated here.

[0044] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A battery cover airtightness testing mechanism, characterized in that, Including the clamping mechanism and the lower cavity assembly; The pressing mechanism includes an upper sealing block, and an upper groove is provided on one side of the upper sealing block facing the lower cavity assembly. A cover plate pressing block is disposed in the upper groove. The lower cavity assembly includes a lower sealing block. The lower sealing block has a lower groove corresponding to the upper groove on one side facing the pressing mechanism. A sealing sleeve is installed in the lower groove. A cover plate fixture is provided on the periphery of the lower groove. A battery cover plate is installed in the cover plate fixture. The battery cover plate is located between the sealing sleeve and the cover plate pressing block. The upper sealing block can be close to or away from the lower sealing block. The inner wall of the sealing sleeve and the battery cover plate form a lower detection chamber. The inner wall of the upper groove, the outer wall of the sealing sleeve, the side of the lower sealing block facing the upper sealing block, and the battery cover plate form an upper detection chamber. A helium detector is connected to the lower detection chamber, and a helium source is connected to the upper detection chamber.

2. The battery cover airtightness testing mechanism according to claim 1, characterized in that, The lower sealing block includes a base block and an assembly block. The base block has a detection air passage. A first through hole is provided on the side of the base block facing the assembly block. The first through hole is connected to the detection air passage. A lower groove hole is provided through the assembly block. The assembly block is fitted and assembled with the base block. The wall of the lower groove hole and the base block form the lower groove. The first through hole is connected to the lower groove hole.

3. The battery cover airtightness testing mechanism according to claim 2, characterized in that, A second sealing groove is provided on one side of the base block facing the assembly block, the first through hole is provided at the bottom of the second sealing groove, and the sealing sleeve is embedded in the second sealing groove.

4. The battery cover airtightness testing mechanism according to claim 3, characterized in that, The sealing sleeve includes a main sleeve, and a shoulder ring is provided at the lower end of the main sleeve. The outer diameter of the shoulder ring is larger than the outer diameter of the main sleeve. The shoulder ring is embedded in the second sealing groove, and the main sleeve is embedded in the lower groove hole. The shoulder ring is located between the bottom inner side of the second sealing groove and the side of the assembly block facing the base block.

5. The battery cover airtightness testing mechanism according to claim 4, characterized in that, A second sealing ring is provided on one side of the shoulder ring facing the inner side of the bottom of the second sealing groove, and the second sealing ring is coaxial with the shoulder ring.

6. The battery cover airtightness testing mechanism according to claim 4, characterized in that, A third sealing ring is provided at one end of the main sleeve facing the battery cover, and the third sealing ring is coaxial with the main sleeve.

7. The battery cover airtightness testing mechanism according to claim 2, characterized in that, The cover plate fixture includes at least two limiting blocks, and the at least two limiting blocks are arranged at intervals along the circumference of the sealing sleeve; The limiting block is installed on the assembly block; The limiting block has a guide surface on the side facing the sealing sleeve. The guide surface includes an assembly surface and a limiting surface that are connected to each other. In the axial direction of the sealing sleeve and from the assembly block toward the base block, the distance between the assembly surface and the central axis of the sealing sleeve gradually decreases.

8. The battery cover airtightness testing mechanism according to claim 7, characterized in that, The assembly surface is a conical surface; the limiting surface is a cylindrical surface; both the assembly surface and the limiting surface are coaxial with the sealing sleeve.

9. The battery cover airtightness testing mechanism according to claim 8, characterized in that, The cover plate fixture also includes a limiting plate, which is disposed on the assembly block; The assembly block is provided with a first mounting slot and a second mounting slot, the first mounting slot being used to assemble the limiting block and the second mounting slot being used to assemble the limiting plate. The assembly block has an annular recess at one end of the lower slot near the upper sealing block. The annular recess passes through the second mounting slot and all the first mounting slots, and the annular recess connects to the lower slot.

10. The battery cover airtightness testing mechanism according to claim 1, characterized in that, The upper sealing block is provided with a third connecting air passage, and the bottom inner side of the upper groove is provided with a fifth through hole, which is connected to the third connecting air passage. A sixth through hole is provided through the cover plate pressure block, which communicates with the fifth through hole. A gas guide groove is provided on one side of the cover plate pressure block facing the lower cavity assembly, which communicates with the sixth through hole. The gas guide groove is used to connect the detection upper cavity and the sixth through hole.

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