Sealing performance detection device and detection device of pole assembly formed by sealing performance detection device

Abstract

The utility model provides a sealing performance detection device and a detection device of a pole assembly formed by the same, the sealing performance detection device comprises an upper die assembly and a lower die assembly, the upper die assembly comprises a first sealing fixing groove, a first sealing ring is sleeved in the first sealing fixing groove, and the inside of the first sealing fixing groove is communicated with a detection air source; the internal area of the first sealing ring is smaller than the sectional area of one end face of the workpiece; the lower die assembly comprises a containing groove matched with the first sealing and fixing groove and a second sealing ring for sealing the containing groove. The placing groove is communicated with a vacuum generator, and a detection piece is arranged in the vacuum generator; when the upper die assembly and the lower die assembly are assembled, one end face of the workpiece in the containing groove abuts against the first sealing ring. The two end faces of the workpiece are arranged in the detection air source environment and the vacuum environment respectively, then the sealing performance between the two end faces of the workpiece is detected, the detection application range is wide, the structure is simple, and detection is accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece sealing detection, in particular to a sealing detection device and a detection device of a pole assembly formed by the sealing detection device. Background Art

[0002] Thanks to the global trend of energy conservation and emission reduction and the rapid development of new energy vehicles, the market demand for power batteries has grown rapidly. Battery poles are important components of power battery structures, and their airtightness test results are an important indicator for measuring battery safety. Therefore, during the production inspection process, helium testing has become an indispensable process for testing battery pole components.

[0003] The structure of the pole assembly is as follows Figure 1 As shown, it includes an inner terminal, an upper plastic, a workpiece sealing ring and an outer terminal. A boss is arranged in the middle of the top of the inner terminal. The outer terminal is located outside the inner terminal. The top of the outer terminal is connected to the inner terminal through the upper plastic, and the bottom of the outer terminal is connected to the inner terminal through the workpiece sealing ring. Figure 2 As shown, after the pole assembly is placed in the hole of the substrate, the bottom of the external terminal is welded. When the battery is subsequently manufactured, the edge of the substrate is welded to the battery shell to form a battery cavity that is closed inside and outside.

[0004] In the assembly structure, the possible leakage paths of the pole assembly are as follows: Figure 3 As shown, path ① and path ② are possible leakage paths of the pole assembly itself, and path ③ is a possible leakage path at the welding point formed after the pole assembly and the substrate are welded. The leakage path at the welding point depends on the accuracy of the welding process, etc., and can be avoided by improving the welding process. The sealing of the pole assembly itself determines its qualification and quality.

[0005] In the prior art, the sealing detection device usually places the pole assembly in the detection chamber for detection, which cannot detect the sealing between the two end faces of the pole assembly. Therefore, how to detect the sealing of the pole assembly itself has become a technical problem that needs to be solved urgently. Utility Model Content

[0006] In order to overcome the problems existing in the related technology, one of the purposes of the utility model is to provide a sealing detection device, which places the two end faces of the workpiece in a detection gas source environment and a vacuum environment respectively, and then detects the sealing between the two end faces of the workpiece. The detection has a wide range of applications, a simple structure, and accurate detection.

[0007] A sealing detection device is used to detect the sealing between two end faces of a workpiece; it comprises an upper die assembly and a lower die assembly,

[0008] The upper mold assembly comprises a first sealing fixing groove, a first sealing ring is sleeved in the first sealing fixing groove, the interior of the first sealing fixing groove is connected to the detection gas source; the interior area of ​​the first sealing ring is smaller than the cross-sectional area of ​​one end surface of the workpiece;

[0009] The lower mold assembly includes a placement groove adapted to the first sealing and fixing groove, and a second sealing ring for sealing the placement groove; the placement groove is connected to a vacuum generator, and a detection component is provided in the vacuum generator; when the upper mold assembly and the lower mold assembly are molded together, one of the end faces of the workpiece in the placement groove abuts against the first sealing ring.

[0010] The detection device of the present application realizes the placement, removal and detection of the workpiece through the closing and separation of the upper mold assembly and the lower mold assembly. It has a simple structure and a wide range of applications. It can be used for all workpiece air tightness detection that requires two end face detection. The detection of the gas source concentration in the vacuum atmosphere by the detection part can accurately reflect the air tightness between the two end faces of the workpiece; and the workpiece placement, removal and clamping efficiency is high, which further improves the efficiency and accuracy of the workpiece air tightness detection.

[0011] In a preferred technical solution of the utility model, the upper mold assembly includes a limiting groove, and M first sealing fixing grooves are arranged inside the limiting groove; the lower mold assembly includes a limiting boss corresponding to the limiting groove, and M placement grooves are arranged inside the limiting boss; M is an integer greater than 0.

[0012] The number of the first sealing groove and the placement groove determines the number of workpieces that can be detected simultaneously by the detection device of the present application. During the process of detecting the airtightness of the workpiece, each placement groove and the first sealing groove can correspond to one workpiece for airtightness detection. Detecting multiple workpieces at the same time can improve the detection efficiency of the detection device of the present application.

[0013] In a preferred technical solution of the utility model, a second sealing fixing groove is arranged on a side of the limiting boss close to the upper mold assembly, and a second sealing ring is arranged inside the second sealing fixing groove.

[0014] The limiting boss can be a rectangular structure, and the second sealing fixing groove is a rectangular or annular groove surrounding the outside of the M placement grooves. The second sealing fixing groove is sleeved with a second sealing ring. It should be noted that the number of first sealing rings in the present application corresponds to the number of detection positions, that is, the top of each detection position is wrapped by the first sealing ring. There is only one second sealing ring, and it is wrapped around the outside of the M placement grooves. The M placement grooves are connected to the vacuum generator at the same time, and the second sealing ring can ensure that the inside of the M placement grooves is in a sealed vacuum atmosphere at the same time. The vacuum atmosphere of the M placement grooves can be sealed by a second sealing ring, which simplifies the structure of the detection device.

[0015] In a preferred technical solution of the utility model, M first sealed fixed grooves are connected to the air intake main pipe through an air intake branch pipe, and the air intake main pipe is connected to the detection air source; M placement grooves are connected to the vacuum main pipe through a vacuum branch pipe, and the vacuum main pipe is connected to the vacuum generator.

[0016] An air intake main pipe is provided in the upper mold assembly, and the air intake main pipe is located on the same side of the M first sealing and fixing grooves. One end of the air intake main pipe is connected to the helium source, and the air intake main pipe is provided with M through holes. One end of the M air intake branch pipes is respectively connected to the through holes of the air intake main pipe, and the other end extends into the first sealing and fixing groove. The M first sealing and fixing grooves are connected to the helium source through the air intake main pipe and the air intake branch pipe, and the M workpieces can be tested for air tightness at the same time, thereby improving the efficiency of air tightness testing. A vacuum main pipe is provided in the lower mold assembly, and the vacuum main pipe is located on the same side of the M placement grooves. One end of the vacuum main pipe is connected to the vacuum generator, and the vacuum main pipe is provided with M through holes. One end of the M vacuum branch pipes is respectively connected to the through holes of the vacuum main pipe, and the other end extends into the placement groove. The M placement grooves are connected to the vacuum generator through the vacuum main pipe and the vacuum branch pipe, and the M workpieces can be tested for air tightness at the same time, thereby improving the efficiency of air tightness testing.

[0017] In a preferred technical solution of the utility model, the orthographic projection area of ​​the workpiece on the bottom surface of the placement groove is smaller than the bottom surface area of ​​the placement groove, and a waist-shaped connecting hole is provided at the bottom of the placement groove, and the waist-shaped connecting hole is connected to the vacuum generator.

[0018] In a preferred technical solution of the utility model, a material taking trough is arranged on the side of the waist-shaped connecting hole.

[0019] Since the height of the placement groove is equal to the height of the workpiece, and the lower mold assembly provided with the placement groove is fixed in the detection platform, if the cross-sectional area of ​​the placement groove in the horizontal direction is equal to the cross-sectional area of ​​the workpiece in the horizontal direction, it will cause the workpiece to be inconvenient to take and place. A material taking groove is set on the side of the placement groove, and the depth of the material taking groove is equal to the depth of the placement groove. The existence of the material taking groove can facilitate the workpiece to be placed in the placement groove and the workpiece to be quickly taken out.

[0020] In a preferred technical solution of the utility model, the workpiece is a battery pole assembly, and the pole assembly includes an inner terminal, an upper plastic, a workpiece sealing ring and an outer terminal. A boss is provided in the middle of the top of the inner terminal, the outer terminal is located on the outside of the inner terminal, and the top of the outer terminal is connected to the inner terminal through the upper plastic, and the bottom of the outer terminal is connected to the inner terminal through the workpiece sealing ring.

[0021] In a preferred technical solution of the utility model, when the pole assembly is placed in the placement groove, the boss of the inner terminal abuts against the bottom of the placement groove, and the outer terminal abuts against the first sealing ring.

[0022] In a preferred technical solution of the utility model, it also includes a detection platform for installing an upper mold assembly and a lower mold assembly, wherein the upper mold assembly is fixed in the detection platform through a first screw fixing hole and a first pin positioning hole; and the lower mold assembly is fixed in the detection platform through a second screw fixing hole and a second pin positioning hole.

[0023] A detection device for a pole assembly comprises the sealing detection device as described above.

[0024] The beneficial effects of the utility model are:

[0025] The utility model provides a sealing detection device, including an upper mold assembly and a lower mold assembly, the upper mold assembly includes a first sealing fixing groove, a first sealing ring is sleeved in the first sealing fixing groove, and the interior of the first sealing fixing groove is connected to a detection gas source; the lower mold assembly includes a placement groove adapted to the first sealing fixing groove, and a second sealing ring for sealing the placement groove; the placement groove is connected to a vacuum generator; when the upper mold assembly and the lower mold assembly are molded together, one of the end faces of the workpiece in the placement groove abuts against the first sealing ring. When the upper mold assembly and the lower mold assembly are closed, the first sealing fixing groove and the placement groove are assembled one by one. When the workpiece is placed in the placement groove, one of the end faces of the workpiece abuts against the first sealing ring, and the internal area of ​​the first sealing ring is smaller than the cross-sectional area of ​​the end face in the workpiece, ensuring that one of the end faces of the workpiece is located inside the placement groove and the other end face abuts against the first sealing ring. At this time, the surface of the workpiece inside the first sealing ring is in a detection gas source atmosphere under the action of the detection gas source, and the area of ​​the workpiece located in the placement groove is in a vacuum atmosphere under the action of the vacuum generator and the second sealing ring. The sealing between the two end faces of the workpiece can be detected by detecting the detection gas source concentration in the vacuum atmosphere through the detection component. The detection device of the present application realizes the placement, removal and detection of the workpiece through the closing and separation of the upper mold assembly and the lower mold assembly. It has a simple structure and a wide range of applications. It can be used for all workpiece air tightness detection that requires two end face detection. The detection of the gas source concentration in the vacuum atmosphere by the detection part can accurately reflect the air tightness between the two end faces of the workpiece; and the workpiece placement, removal and clamping efficiency is high, which further improves the efficiency and accuracy of the workpiece air tightness detection.

[0026] The utility model also provides a detection device for a pole assembly including the above-mentioned sealing detection device, which is used to detect the airtightness between the inner terminal and the outer terminal in the pole assembly. It has a simple structure and a high clamping accuracy for the pole assembly, thereby improving the efficiency and accuracy of the pole assembly airtightness detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the pole assembly in this application;

[0028] Figure 2 This is a schematic diagram of the assembly of the pole assembly in this application;

[0029] Figure 3 This is a schematic diagram of the leakage of the pole assembly in this application;

[0030] Figure 4 It is a structural schematic diagram of the upper mold assembly in this application;

[0031] Figure 5 This is a schematic diagram of the structure of the lower mold assembly in this application;

[0032] Figure 6 It is a schematic diagram of the detection when the upper mold assembly and the lower mold assembly are molded together;

[0033] Figure 7 This is a schematic diagram of the upper mold assembly and the lower mold assembly being separated.

[0034] Reference numerals:

[0035] 1. Inner terminal; 2. Upper plastic; 3. Workpiece sealing ring; 4. External short; 5. Base plate; 6. Battery shell; 7. Weld between pole assembly and base plate; 8. Weld between base plate and battery shell; 9. First screw fixing hole; 10. First pin positioning hole; 11. Inlet main pipe; 12. Inlet branch pipe; 13. First sealing fixing groove; 14. Limiting groove; 15. Second screw fixing hole; 16. Second pin positioning hole; 17. Vacuum main pipe; 18. Vacuum branch pipe; 19. Joint fixing position; 20. Waist-shaped connecting hole; 21. Placement groove; 22. Material taking groove; 23. Second sealing fixing groove; 24. Limiting boss; 25. Helium area; 26. Vacuum area; 27. External environment; 28. First sealing ring; 29. ​​Second sealing ring. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0037] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0038] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] Example 1

[0040] like Figure 4-Figure 7 As shown, the present application provides a sealing detection device, including an upper mold assembly and a lower mold assembly.

[0041] The upper die assembly comprises a first sealing fixing groove 13, in which a first sealing ring 28 is sleeved, and the interior of the first sealing fixing groove 13 is connected to a detection gas source; the interior area of ​​the first sealing ring is smaller than the cross-sectional area of ​​one end surface of the workpiece;

[0042] The lower mold assembly includes a placement groove 21 adapted to the first sealing and fixing groove 13, and a second sealing ring 29 for sealing the placement groove 21; the placement groove 21 is connected to a vacuum generator, and a detection component is provided in the vacuum generator; when the upper mold assembly and the lower mold assembly are molded, one of the end faces of the workpiece in the placement groove 21 abuts against the first sealing ring.

[0043] In the present application, the workpiece may be a workpiece such as a cuboid or a cylinder with relatively neat top and bottom end faces, and the workpiece is assembled from multiple parts. By measuring the airtightness between the top and bottom end faces, it is determined whether the sealing of the workpiece itself meets the standard.

[0044] The present application can set the distance between the bottom of the placement groove 21 and the first sealing ring 28 to be equal to the height of the workpiece, so as to ensure that the top end face of the workpiece abuts against the first sealing ring. Specifically, when the upper mold assembly and the lower mold assembly are molded, the first sealing fixing groove 13 and the placement groove 21 are assembled one by one. When the workpiece is placed in the placement groove 21, since the distance between the bottom of the placement groove 21 and the first sealing ring 28 is equal to the height of the workpiece, and the internal area of ​​the first sealing ring 28 is smaller than the cross-sectional area of ​​the workpiece, it is ensured that one end face of the workpiece is flush with the bottom of the placement groove 21, and the other end face abuts against the first sealing ring 28. At this time, the workpiece surface inside the first sealing ring 28 is in the detection gas source atmosphere under the action of the detection gas source, and the area of ​​the workpiece located in the placement groove 21 is in the vacuum atmosphere under the action of the vacuum generator and the second sealing ring 29. The detection of the sealing between the two end faces of the workpiece can be achieved by detecting the concentration of the detection gas source in the vacuum atmosphere through the detection part. The detection device of the present application realizes the placement, removal and detection of the workpiece through the closing and separation of the upper mold assembly and the lower mold assembly. It has a simple structure and a wide range of applications. It can be used for all workpiece air tightness detection that requires two end face detection. The detection of the gas source concentration in the vacuum atmosphere by the detection part can accurately reflect the air tightness between the two end faces of the workpiece; and the workpiece placement, removal and clamping efficiency is high, which further improves the efficiency and accuracy of the workpiece air tightness detection.

[0045] In the present application, a detection component is provided in the vacuum generator, and the detection component is used to detect the concentration of the detection gas source in the vacuum atmosphere formed after the vacuum generator is evacuated. In the present application, the vacuum generator can also be integrated with the detection component to form a device that can simultaneously evacuate and detect the concentration of the detection gas source in the vacuum environment.

[0046] When the upper mold assembly and the lower mold assembly are molded together and the workpiece is placed in the placement groove 21, the top end face edge of the workpiece abuts against the first sealing ring 28, and the bottom end of the workpiece is located in the placement groove 21. The internal area of ​​the first sealing ring 28 is filled with the detection gas source, and the placement groove 21 is evacuated by the vacuum generator. If the detection gas source appears in the vacuum environment, it means that there is a leak between the top and bottom ends of the workpiece, and the sealing performance is not good.

[0047] In the present application, the detection gas source may be a gas used for air tightness detection such as helium, or other detection gas sources. The connection between the interior of the first sealing fixing groove 13 and the detection gas source may be achieved by connecting the first sealing fixing groove 13 to a helium source.

[0048] Example 2

[0049] The present application provides a sealing detection device, including an upper mold assembly and a lower mold assembly. Among them, the upper mold assembly and the lower mold assembly are both installed in the detection platform, one of the components can be fixed in the detection platform, and the other component slides relative to the detection platform to achieve mold closing and separation between the two components. As a specific embodiment, the present application can set the lower mold assembly to be fixed in the detection platform through the second screw fixing hole 15 and the second pin positioning hole 16, and the lower mold assembly is fixed relative to the detection platform. The upper mold assembly can be lifted and slid relative to the lower mold assembly. When closing the mold, the upper mold assembly is fixed in the detection platform through the first screw fixing hole 9 and the first pin positioning hole 10. When separating, the first screw and the first pin are removed, so that the upper mold assembly slides upward along the guide column, etc., so that the upper mold assembly and the lower mold assembly are separated from each other.

[0050] like Figure 4 As shown, the upper mold assembly includes a limiting groove 14, which is the bottom of the upper mold assembly, that is, a groove arranged near one side of the lower mold assembly. The limiting groove 14 is provided with M first sealing fixing grooves 13 inside, and the first sealing fixing grooves 13 are grooves located inside the limiting groove 14. M is an integer greater than 0, and is specified in the appended claims of this application. Figure 4 In the example, M is equal to four. The number of first sealing grooves determines the number of workpieces that can be detected simultaneously by the detection device of the present application. During the process of detecting the airtightness of workpieces, each first sealing groove can correspond to one workpiece for airtightness detection. Detecting multiple workpieces at the same time can improve the detection efficiency of the detection device of the present application.

[0051] In the present application, a first sealing ring 28 is sleeved in the first sealing fixing groove 13, and the internal area of ​​the first sealing ring is smaller than the cross-sectional area of ​​one of the end faces of the workpiece. The reason why the internal area of ​​the first sealing ring 28 needs to be smaller than the cross-sectional area of ​​the workpiece is to ensure that when the upper mold assembly abuts against the end face of the workpiece, the first sealing ring 28 can circle a sealed space in the end face of the workpiece for connecting with the detection gas source.

[0052] The interior of the first sealing fixing groove 13 is connected to the detection gas source. Specifically, the first sealing fixing groove 13 may be an annular groove, and the first sealing ring 28 is an annular sealing ring, which is nested inside the first sealing fixing groove 13. A through hole is provided inside the first sealing ring 28 or the first sealing fixing groove 13, that is, in an area close to the center of the circle, to achieve communication with the detection gas source.

[0053] In this embodiment, the detection gas source can be helium, that is, the interior of the first sealing ring 28 is connected to the helium source. In order to realize the helium input to multiple test stations at the same time, the M first sealing fixed grooves 13 of the present application are connected to the air intake main pipe 11 through the air intake branch pipe 12, and the air intake main pipe 11 is connected to the detection gas source. In other words, an air intake main pipe 11 is provided in the upper mold assembly, and the air intake main pipe 11 is located on the same side of the M first sealing fixed grooves 13. One end of the air intake main pipe 11 is connected to the helium source, and M through holes are provided in the air intake main pipe 11. One end of the M air intake branch pipes 12 is respectively connected to the through holes of the air intake main pipe 11, and the other end extends into the interior of the first sealing fixed groove 13. The M first sealing fixed grooves 13 are connected to the helium source through the air intake main pipe 11 and the air intake branch pipe 12, and the air tightness detection of M workpieces can be performed at the same time, which improves the efficiency of the air tightness detection.

[0054] like Figure 5 As shown, the lower mold assembly includes a limiting boss 24 corresponding to the limiting groove 14. The limiting boss 24 refers to a boss provided on one side of the lower mold assembly close to the upper mold assembly. The size and shape of the limiting boss 24 match the size and shape of the limiting groove 14. When the upper mold assembly and the lower mold assembly are molded together, the limiting boss 24 is wrapped by the limiting groove 14, and an airtightness detection position is formed inside the limiting boss 24 and the limiting groove 14.

[0055] M placement grooves 21 are arranged inside the limiting boss 24; M is an integer greater than 0. The placement grooves 21 correspond one-to-one to the first sealing fixing grooves 13, and the placement grooves 21 refer to grooves located in the upper surface of the limiting boss 24, which are used to place the workpiece. When the workpiece is placed inside the placement groove 21, and the upper mold assembly and the lower mold assembly are molded together, one of the end faces of the workpiece in the placement groove 21 abuts against the first sealing ring. In other words, when the workpiece is placed inside the placement groove 21, and the upper mold assembly and the lower mold assembly are molded together, the top end of the workpiece abuts against the first sealing ring 28, and the bottom end of the workpiece is flush with the bottom of the placement groove 21.

[0056] The number of the first sealing groove and the placement groove 21 determines the number of workpieces that can be simultaneously detected by the detection device of the present application. During the process of detecting the airtightness of the workpiece, each placement groove 21 cooperates with the first sealing groove to perform airtightness detection on one workpiece. Detecting multiple workpieces at the same time can improve the detection efficiency of the detection device of the present application.

[0057] Furthermore, a second sealing fixing groove 23 is provided on a side of the limiting boss 24 described in the present application close to the upper mold assembly, and a second sealing ring 29 is provided inside the second sealing fixing groove 23 .

[0058] The limiting boss 24 can be a rectangular parallelepiped structure, and the second sealing fixed groove 23 is a rectangular parallelepiped or annular groove surrounding the outside of the M placement grooves 21. The second sealing fixed groove 23 is sleeved with a second sealing ring 29. It should be noted that the number of first sealing rings 28 in the present application corresponds to the number of detection positions, that is, the top of each detection position is wrapped by the first sealing ring 28. There is only one second sealing ring 29, and it is wrapped around the outside of the M placement grooves 21. The M placement grooves 21 are connected to the vacuum generator at the same time, and the second sealing ring 29 can ensure that the inside of the M placement grooves 21 is in a sealed vacuum atmosphere at the same time. The vacuum atmosphere of the M placement grooves 21 can be sealed by a second sealing ring 29, which simplifies the structure of the detection device.

[0059] In the present application, the limiting groove 14 can wrap around the limiting boss 24. In order to place the workpiece inside the limiting boss 24, it is necessary to set M placement grooves 21 on the upper surface of the limiting boss 24. The placement groove 21 is a structure that is recessed relative to the upper surface of the limiting boss 24 and is used to place the workpiece. When the upper mold assembly and the lower mold assembly are molded together, the limiting groove 14 wraps around the limiting boss 24, and the first sealing ring 28 is flush with the upper surface of the limiting boss 24. Therefore, the height of the placement groove 21 can be set to be equal to the height of the workpiece.

[0060] In the present application, M placement slots 21 are connected to the vacuum main pipe 17 through the vacuum branch pipe 18, and the vacuum main pipe 17 is connected to the vacuum generator. That is to say, a vacuum main pipe 17 is provided in the lower mold assembly, and the vacuum main pipe 17 is located on the same side of the M placement slots 21. The central area of ​​the vacuum main pipe 17 is connected to the vacuum generator through the joint fixing position 19, and M through holes are provided in the vacuum main pipe 17. One end of the M vacuum branch pipes 18 is respectively connected to the through holes of the vacuum main pipe 17, and the other end extends into the interior of the placement slot 21. The connection between the M placement slots 21 and the vacuum generator is realized through the vacuum main pipe 17 and the vacuum branch pipe 18, and the air tightness detection of M workpieces can be performed at the same time, which improves the efficiency of the air tightness detection.

[0061] Further, in the mold closing direction perpendicular to the upper mold assembly and the lower mold assembly, the orthographic projection area of ​​the workpiece on the bottom surface of the placement groove 21 of the present application is smaller than the bottom surface area of ​​the placement groove 21, and a material taking groove 22 is provided on the side of the waist-shaped connecting hole 20. A waist-shaped connecting hole 20 is provided at the bottom of the placement groove 21, and the waist-shaped connecting hole 20 is connected to the vacuum generator.

[0062] The reason why the cross-sectional area of ​​the placement groove 21 on the horizontal plane is set to be larger than the cross-sectional area of ​​the workpiece is to ensure that there is space inside the placement groove 21 in addition to the area for accommodating the workpiece. Since the height of the placement groove 21 is equal to the height of the workpiece, and the lower mold assembly provided with the placement groove 21 is fixed in the detection platform, if the cross-sectional area of ​​the placement groove 21 is equal to the cross-sectional area of ​​the workpiece, it will cause the workpiece to be inconvenient to take and place. A material extraction groove 22 is set on the side of the placement groove 21, and the depth of the material extraction groove 22 is equal to the depth of the placement groove 21. The existence of the material extraction groove 22 can facilitate the workpiece to be placed in the placement groove and the workpiece to be quickly taken out.

[0063] In the present application, the placement groove 21 can be a cylindrical groove, and there are two material taking grooves 22, which are protrusions symmetrically arranged on both sides of the cylindrical groove. This can ensure accurate positioning when the workpiece is placed, and is convenient for placement and clamping.

[0064] The waist-shaped hole of the present application is connected to the vacuum generator through the vacuum branch pipe 18 and the vacuum main pipe 17. When it is necessary to test the sealing between the upper surface area of ​​the workpiece and the lower surface and side area of ​​the workpiece, it is necessary to set the length of the waist-shaped hole to be greater than the length of the workpiece to ensure that the lower surface and the side of the workpiece are simultaneously in the vacuum atmosphere. When it is necessary to test the sealing between the upper surface area of ​​the workpiece and the lower surface of the workpiece, it is necessary to set the length of the waist-shaped hole to be less than the length of the workpiece to ensure that the lower surface of the workpiece is in the vacuum atmosphere. The drawings of the present application illustrate the example of the length of the waist-shaped hole being greater than the length of the workpiece.

[0065] Example 3

[0066] The present application provides a detection device for a pole assembly, which is used to detect the air tightness of a pole assembly of a battery. Figure 1 As shown, it includes an inner terminal 1, an upper plastic 2, a workpiece sealing ring 3 and an outer terminal, wherein a boss is arranged in the middle of the top of the inner terminal 1, the outer terminal is located outside the inner terminal 1, and the top of the outer terminal is connected to the inner terminal 1 through the upper plastic 2, and the bottom of the outer terminal is connected to the inner terminal 1 through the workpiece sealing ring 3. Finally, the bottom of the outer terminal wraps the inner terminal 1.

[0067] After the terminal assembly is assembled with the battery, Figure 2 As shown, after the pole assembly is placed in the hole of the substrate 5, the bottom of the external terminal is welded. When the battery is subsequently manufactured, the edge of the substrate 5 is welded to the battery shell 6 to form a battery cavity that is closed inside and outside.

[0068] In the assembly structure, the possible leakage paths of the pole assembly are as follows: Figure 3 As shown, path ① and path ② are possible leakage paths of the pole assembly itself, and the purpose of this application is to detect whether there is leakage in path ① and path ②.

[0069] The detection device used in this application is as described in Example 2. The structure will not be described in detail here, and only the detection principle will be described:

[0070] like Figure 4-Figure 7 As shown, when the pole assembly is placed in the placement groove 21, the protrusion of the inner terminal 1 is located in the waist-shaped hole, and the surface of the inner terminal 1 outside the protrusion is flush with the bottom of the placement groove 21. In the present application, the length of the waist-shaped hole is greater than the length of the protrusion, ensuring that the vacuum atmosphere is filled in the protrusion and the side of the pole assembly. The height of the placement groove is equal to the height of the pole assembly, ensuring that after the pole assembly is placed in the placement groove 21, the side of the outer terminal away from the protrusion is flush with the top of the placement groove 21.

[0071] like Figure 6 As shown, when the upper mold base assembly and the lower mold assembly are closed, one of the inspection stations is used as an example for explanation: the first sealing ring 28 abuts against the side of the outer terminal away from the protrusion, so that the inner terminal 1 on the side of the outer terminal away from the protrusion is connected to the helium source through the air inlet branch pipe 12 and the air inlet main pipe 11, and the helium source starts to supply air to the inspection station. At this time, the inner terminal 1 on the side of the outer terminal away from the protrusion is in the helium area 25.

[0072] The inner terminal 1 protrusion is located in the waist-shaped hole, and the length of the waist-shaped hole is greater than the protrusion length. The M placement grooves are sealed by the second sealing ring 29. The vacuum generator is running, so that the bottom and side of the pole assembly inside the placement groove 21 are located in the vacuum area 26. The area outside the second sealing ring 29 in the limiting protrusion is the external environment 27.

[0073] If the helium in helium area 25 passes through Figure 3 Path ① and path ② enter the vacuum region 26, and the detection component detects the helium concentration in the vacuum region 26. If no helium is detected, it means that the pole assembly has good air tightness. If helium is detected, it means that the pole assembly has poor air tightness.

[0074] After the test is completed, Figure 7 As shown, the vacuum generator stops running, the helium source stops supplying gas, the upper mold assembly rises relative to the lower mold assembly, and the pole assembly can be taken out.

[0075] Example 4

[0076] The difference between this embodiment and embodiment 2 is that the second sealing ring 29 is arranged inside the waist-shaped hole, and the length of the waist-shaped hole is less than or equal to the length of the workpiece. In this embodiment, the first sealing ring 28 connects the air intake branch pipe 12 and the air intake main pipe 11 to form a helium area 25 on the upper surface of the workpiece, and the second sealing ring 29 connects the vacuum branch pipe 18 and the vacuum main pipe 17 to form a vacuum area 26 on the lower surface of the workpiece. The detection device is used to detect the air tightness between the upper surface and the lower surface of the workpiece.

[0077] Example 5

[0078] The difference between this embodiment and embodiment 2 is that the second sealing ring 29 is arranged at the top of the placement groove 21, and the number of the second sealing rings 29 corresponds to the placement groove 21. The top of each placement groove 21 is provided with a second sealing fixing groove 23, and the second sealing fixing groove 23 is equipped with a second sealing ring 29. In this embodiment, the first sealing ring 28 is connected to the air intake branch pipe 12 and the air intake main pipe 11 to form a helium area 25 on the upper surface of the workpiece, and the second sealing ring 29 is connected to the vacuum branch pipe 18 and the vacuum main pipe 17 to form a vacuum area 26 on the lower surface and side of the workpiece. The detection device is used to detect the air tightness between the upper surface, the lower surface and the side of the workpiece.

[0079] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings. In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0080] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0081] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0082] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sealing detection device for detecting the sealing between two end faces of a workpiece; characterized in that: Including upper mold assembly and lower mold assembly, The upper mold assembly comprises a first sealing fixing groove, in which a first sealing ring (28) is sleeved, and the interior of the first sealing fixing groove is connected to a detection gas source; the interior area of ​​the first sealing ring (28) is smaller than the cross-sectional area of ​​one end surface of the workpiece; The lower mold assembly comprises a placement groove (21) adapted to the first sealing fixing groove, and a second sealing ring (29) for sealing the placement groove (21); the placement groove (21) is connected to a vacuum generator, and a detection component is provided in the vacuum generator; when the upper mold assembly and the lower mold assembly are closed, one end surface of the workpiece in the placement groove (21) abuts against the first sealing ring.

2. A sealing detection device according to claim 1, characterized in that: The upper mold assembly comprises a limiting groove (14), wherein M first sealing fixing grooves are arranged inside the limiting groove (14); the lower mold assembly comprises a limiting boss (24) corresponding to the limiting groove (14), wherein M placement grooves (21) are arranged inside the limiting boss (24); M is an integer greater than 0.

3. A sealing detection device according to claim 2, characterized in that: A second sealing fixing groove (23) is arranged on one side of the limiting boss (24) close to the upper die assembly, and a second sealing ring (29) is arranged inside the second sealing fixing groove (23).

4. A sealing detection device according to claim 1, characterized in that: The M first sealing fixed grooves are connected to the air intake main pipe (11) via an air intake branch pipe (12), and the air intake main pipe (11) is connected to a detection air source; the M placement grooves (21) are connected to the vacuum main pipe (17) via a vacuum branch pipe (18), and the vacuum main pipe (17) is connected to a vacuum generator.

5. A sealing detection device according to claim 1, characterized in that: The orthographic projection area of ​​the workpiece on the bottom surface of the placement groove (21) is smaller than the bottom surface area of ​​the placement groove (21), and a waist-shaped connecting hole (20) is provided at the bottom of the placement groove (21), and the waist-shaped connecting hole (20) is connected to the vacuum generator.

6. A sealing detection device according to claim 5, characterized in that: A material taking trough (22) is provided on the side of the waist-shaped connecting hole (20).

7. A sealing detection device according to claim 1, characterized in that: The workpiece is a battery pole assembly, the pole assembly comprising an inner terminal (1), an upper plastic (2), a workpiece sealing ring (3) and an outer terminal, a boss is arranged in the middle of the top of the inner terminal (1), the outer terminal is located outside the inner terminal (1), the top of the outer terminal is connected to the inner terminal (1) through the upper plastic (2), and the bottom of the outer terminal is connected to the inner terminal (1) through the workpiece sealing ring (3).

8. A sealing detection device according to claim 7, characterized in that: When the pole assembly is placed in the placement groove (21), the boss of the inner terminal (1) abuts against the bottom of the placement groove (21), and the outer terminal abuts against the first sealing ring (28).

9. A sealing detection device according to claim 1, characterized in that: It also includes a detection platform for installing an upper mold assembly and a lower mold assembly, wherein the upper mold assembly is fixed in the detection platform via a first screw fixing hole (9) and a first pin positioning hole (10); and the lower mold assembly is fixed in the detection platform via a second screw fixing hole (15) and a second pin positioning hole (16).

10. A detection device for a pole assembly, characterized in that: A sealing detection device comprising any one of claims 1-9.

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