Core rod for sealing leakage detection of battery case and device for sealing leakage detection of battery case

Abstract

The utility model discloses a core rod for sealing and leakage detecting of a battery case and a device for sealing and leakage detecting of the battery case. The core rod comprises a core rod body and a first sealing ring, the core rod body is provided with a first end face and a second end face which are arranged back to back in the axial direction of the core rod body, an air guide hole channel is formed in the core rod body, and the air guide hole channel is communicated with the first end face and the second end face. A first positioning groove is formed in the area, close to the first end face, of the side face of the core rod body and surrounds the air guide hole channel, an acute angle is formed between the depth direction of the first positioning groove and the axial direction of the core rod body, one part of the first sealing ring is arranged in the first positioning groove, and the other part of the first sealing ring protrudes out of the first positioning groove. And the other part also convexly extends to the upper part of the first end surface along the axial direction of the core rod main body. According to the utility model, the core rod adopts a split type structure, and the sealing ring with a unique cross section is adopted for sealing, so that the requirements of round shell helium detection equipment with smaller diameter are met.

Description

Technical Field

[0001] This utility model specifically relates to a mandrel for detecting leaks in battery casings and a device for detecting leaks in battery casings, belonging to the field of battery casing helium detection technology. Background Technology

[0002] Currently, the lower chamber mandrel used in round shell helium detection equipment in the industry is generally pressed at the bottom by a circular cross-section sealing ring to form a sealed helium detection area; since the diameter of the circular sealing ring is relatively large, it is mostly suitable for round shells with larger diameters. Utility Model Content

[0003] The main purpose of this invention is to provide a core rod and a device for leak detection of battery casings, which can effectively reduce the area of ​​the sealing region and greatly facilitate helium detection equipment for small-diameter round shells. Furthermore, the core rod in this invention adopts a split structure, and the vulnerable parts of the core rod and the sealing ring are easy to replace, which facilitates equipment maintenance and overcomes the shortcomings of the prior art.

[0004] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes:

[0005] A first aspect of this utility model provides a mandrel for leak detection in battery casing sealing, comprising: a mandrel body and a first sealing ring.

[0006] The mandrel body has a first end face and a second end face that are opposite to each other along its own axial direction. The mandrel body has an air guide channel inside, which communicates with the first end face and the second end face. A first positioning groove is provided on the side of the mandrel body near the first end face. The first positioning groove surrounds the air guide channel. The depth direction of the first positioning groove forms an acute angle with the axial direction of the mandrel body. A part of the first sealing ring is disposed in the first positioning groove, and another part protrudes outside the first positioning groove. The other part also protrudes along the axial direction of the mandrel body to the top of the first end face.

[0007] When the first sealing ring contacts the bottom of the battery case and applies pressure, the first sealing ring can deform and fit tightly against the wall of the first positioning groove. In addition, another part of the first sealing ring adapts to fit against the bottom of the battery case.

[0008] A second aspect of this utility model provides an apparatus for leak detection of a battery casing seal, comprising: a vacuuming mechanism, a helium supply mechanism, a driving mechanism, and a mandrel for leak detection of the battery casing seal. The vacuuming mechanism and the helium supply mechanism are connected to the gas channel from one side of the second end face of the mandrel. The driving mechanism is in transmission cooperation with the mandrel and is used to drive the mandrel to move along its own axial direction.

[0009] Compared with the prior art, the advantages of this utility model include:

[0010] This utility model provides a mandrel for leak detection of battery casing seals, which can meet the helium testing requirements of cylindrical battery casings. The mandrel adopts a split structure and uses a sealing ring with a unique cross-section for sealing, thus meeting the needs of helium testing equipment for smaller diameter cylindrical casings.

[0011] This utility model provides a mandrel for leak detection of battery casing seals. It adopts a split structure, with the upper section of the mandrel being detachable for easy replacement. Furthermore, due to its structural characteristics, the sealing ring of the upper section of the mandrel can be changed to a smaller diameter, thus making it more widely applicable to round shells of different sizes and greatly improving the applicable detection range of helium detection equipment. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a cross-sectional structural diagram of a core rod for leak detection of battery casing sealing provided in a typical embodiment of this utility model;

[0014] Figure 2 This is a cross-sectional structural diagram of a core rod used for leak detection in battery casing sealing, provided in a typical embodiment of this utility model. Detailed Implementation

[0015] In view of the shortcomings of the prior art, the inventor of this case, through long-term research and extensive practice, has come up with the technical solution of this utility model. The following will further explain the technical solution, its implementation process, and its principles.

[0016] A first aspect of this utility model provides a mandrel for leak detection in battery casing sealing, comprising: a mandrel body and a first sealing ring.

[0017] The mandrel body has a first end face and a second end face that are opposite to each other along its own axial direction. The mandrel body has an air guide channel inside, which communicates with the first end face and the second end face. A first positioning groove is provided on the side of the mandrel body near the first end face. The first positioning groove surrounds the air guide channel. The depth direction of the first positioning groove forms an acute angle with the axial direction of the mandrel body. A part of the first sealing ring is disposed in the first positioning groove, and another part protrudes outside the first positioning groove. The other part also protrudes along the axial direction of the mandrel body to the top of the first end face.

[0018] When the first sealing ring contacts the bottom of the battery case and applies pressure, the first sealing ring can deform and fit tightly against the wall of the first positioning groove. In addition, another part of the first sealing ring adapts to fit against the bottom of the battery case.

[0019] Furthermore, the first positioning groove includes a first groove wall and a second groove wall, which intersect at the bottom of the groove. The second groove wall is located between the first groove wall and the first end face. The first groove wall is parallel to the radial section of the mandrel body. Alternatively, the first groove wall is inclined from the end that intersects with the second groove wall in a direction approaching the first end face. The angles formed by the second groove wall, the radial section of the mandrel body, and the first side wall are all acute angles.

[0020] Furthermore, the first sealing ring has an adjacent first side and a second side, the first side being in contact with the first groove wall and the second side being in contact with the second side wall.

[0021] Furthermore, the longitudinal cross-section of the first sealing ring is triangular or trapezoidal.

[0022] Furthermore, the core rod body includes a first core rod and a second core rod, which are detachably fixed. The first core rod has a first hole segment extending along its own axial direction, and the second core rod has a second hole segment extending along its own axial direction. The first hole segment and the second hole segment are connected to form the air guide channel. The first end face is located at the end of the first core rod opposite to the second core rod, and the second end face is located at the end of the second core rod opposite to the first core rod. The first sealing ring is detachably disposed on the first core rod.

[0023] Furthermore, the first core rod and the second core rod are coaxially arranged.

[0024] Furthermore, one of the first mandrel and the second mandrel has a mortise and the other has a tenon, the tenon being inserted into the mortise and / or the first mandrel and the second mandrel are also connected by a first fastening connector.

[0025] Furthermore, one of the first hole segment and the second hole segment also penetrates the tenon, and one of the first hole segment and the second hole segment communicates with the bottom of the mortise groove.

[0026] In a more specific embodiment, the mandrel for leak detection of battery casing sealing further includes: at least one second sealing ring, the second sealing ring being disposed between the first mandrel and the second mandrel, and the second sealing ring being in a sealing fit with the first mandrel and the second mandrel.

[0027] Furthermore, the second sealing ring is disposed between the tenon and the mortise.

[0028] Furthermore, the tenon and / or the mortise are provided with a second positioning groove that extends continuously along its circumference, and a portion of the second sealing ring is disposed within the second positioning groove.

[0029] Furthermore, the mandrel for leak detection of battery casing sealing includes a plurality of second sealing rings, which are arranged sequentially at intervals along the axial direction of the first mandrel or the second mandrel.

[0030] In a more specific embodiment, the mandrel for battery casing sealing leak detection further includes a height adjustment block, which is disposed on the second mandrel, and the axial position of the height adjustment block on the second mandrel is adjustable.

[0031] Furthermore, the height adjustment block is connected to the second mandrel via a second fastening connector.

[0032] Furthermore, the second mandrel includes a first mandrel segment, a second mandrel segment, and a third mandrel segment arranged sequentially along its own axial direction. The radial cross-sectional area of ​​the first mandrel segment is greater than that of the second mandrel segment, which is greater than that of the third mandrel segment. The third mandrel segment is connected to the first mandrel, and the height adjustment block is disposed on the second mandrel segment.

[0033] Furthermore, the height adjustment block is entirely fitted onto the second mandrel.

[0034] Furthermore, the third core rod segment serves as a tenon as a whole.

[0035] In a more specific implementation, the mandrel for battery casing sealing and leak detection further includes a protective sleeve, which is fitted onto the first mandrel.

[0036] Furthermore, the protective sleeve is a non-metallic component.

[0037] Furthermore, the mandrel used for leak detection of battery casing sealing also includes a third sealing ring, which is disposed on the second end face.

[0038] A second aspect of this utility model provides an apparatus for leak detection of a battery casing seal, comprising: a vacuuming mechanism, a helium supply mechanism, a driving mechanism, and a mandrel for leak detection of the battery casing seal. The vacuuming mechanism and the helium supply mechanism are connected to the gas channel from one side of the second end face of the mandrel. The driving mechanism is in transmission cooperation with the mandrel and is used to drive the mandrel to move along its own axial direction.

[0039] To make the objectives, features, and advantages of the present invention more apparent and understandable, the technical solution, its implementation process, and principles will be further explained below in conjunction with the accompanying drawings and specific implementation examples. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0040] In a typical implementation case, please refer to Figure 1 A mandrel for leak detection of battery casing sealing includes a mandrel body and a first sealing ring 1. The mandrel body has a first end face and a second end face arranged opposite each other along its own axial direction. The mandrel body has an air guide channel inside, which communicates with the first end face and the second end face. A first positioning groove is provided on the side of the mandrel body near the first end face. The first positioning groove surrounds the air guide channel. A part of the first sealing ring 1 is disposed in the first positioning groove, and another part protrudes outside the first positioning groove. The other part also protrudes along the axial direction of the mandrel body to the top of the first end face. When the first sealing ring 1 contacts the bottom of the battery casing 2 and generates pressure, the first sealing ring 1 can deform and fit tightly against the groove wall of the first positioning groove. In addition, the other part of the first sealing ring 1 adaptively fits against the bottom of the battery casing 2.

[0041] It should be noted that the first sealing ring 1 is sleeved on the core rod body and located near the first end of the core rod body. The first positioning groove is not only used to fix / restrict the first sealing ring 1, but also to provide deformation guidance for the first sealing ring 1 under pressure deformation. It should also be noted that in the axial direction of the core rod body, part of the first sealing ring 1 protrudes above the first end face, and the first sealing ring 1 will contact the bottom of the battery case 2 before the first end face of the core rod body.

[0042] Specifically, the first positioning groove is set on the side of the mandrel body, and the depth direction of the first positioning groove forms an acute angle with the axial direction of the mandrel body. It can be understood that the depth direction of the first positioning groove is inclined downward along the axial direction of the mandrel body (from the first end face to the second end face). With this design, the first sealing ring 1 can be better confined in the first positioning groove, and even if the first sealing ring 1 is under pressure, it will not come out of the first positioning groove and separate from the mandrel body.

[0043] Specifically, the first positioning groove includes a first groove wall and a second groove wall, which intersect at the bottom of the groove. The second groove wall is located between the first groove wall and the first end face. The first groove wall is parallel to the radial section of the mandrel body, or the first groove wall is inclined from the end intersecting the second groove wall in a direction approaching the first end face. The angles formed by the second groove wall, the radial section of the mandrel body, and the first side wall are all acute angles. For example, the longitudinal section of the first positioning groove is a triangular structure. The direction of the angle bisector of the angle formed by the intersection of the first groove wall and the second groove wall can be regarded as the longitudinal direction of the first positioning groove, that is, the angle bisector of the angle formed by the intersection of the first groove wall and the second groove wall forms an acute angle with the central axis of the mandrel body.

[0044] More specifically, the first sealing ring 1 has an adjacent first side and a second side. The first side fits against the first groove wall, and the second side fits against the second side wall. For example, the longitudinal cross-section of the first sealing ring 1 is triangular or trapezoidal. It can be understood that the first side of the first sealing ring 1 contacts the first groove wall of the first positioning groove, and the second side contacts the second groove wall, together forming a deformation guide that allows the first sealing ring 1 to deform under pressure, and a motion guide that allows relative movement between the first sealing ring 1 and the mandrel body due to pressure on the first sealing ring 1. More specifically, the first sealing ring 1 is an elastic structure capable of recoverable deformation, for example, the first sealing ring 1 is an O-ring, etc.

[0045] Specifically, to improve the convenience of mandrel maintenance, the mandrel body is preferably a detachable split structure. Specifically, the mandrel includes a first mandrel 3 and a second mandrel 6, which are detachably connected. The first mandrel 3 has a first hole section that extends along its own axis, and the second mandrel 6 has a second hole section that extends along its own axis. The first hole section and the second hole section are connected to form an air guide channel. The first end face is located at the end of the first mandrel 3 that is opposite to the second mandrel 6, and the second end face is located at the end of the second mandrel 6 that is opposite to the first mandrel 3. The first sealing ring 1 is detachably disposed on the first mandrel 3, that is, the first positioning groove is located on the first mandrel 3.

[0046] More specifically, the first core rod 3 and the second core rod 6 are preferably coaxially arranged. As a typical detachable connection method, one of the first core rod 3 and the second core rod 6 has a mortise and tenon, the tenon being embedded in the mortise. One of the first and second hole segments also penetrates the tenon, and the first and second hole segments communicate with the bottom of the mortise. Specifically, to improve the stability of the connection structure between the first core rod 3 and the second core rod 6, the first core rod 3 and the second core rod 6 are also connected by a first fastening connector 5. More specifically, the first fastening connector 5 can be a locating pin or a bolt, etc.

[0047] Specifically, to improve the airtightness of the mandrel body itself, the mandrel body also includes at least one second sealing ring 4. The second sealing ring 4 is disposed between the first mandrel 3 and the second mandrel 6, and the second sealing ring 4 is in a sealing fit with the first mandrel 3 and the second mandrel 6. As a typical implementation, the second sealing ring 4 is disposed between the tenon and the mortise. More specifically, to further improve the airtightness of the mandrel body itself and the stability of the sealing structure, a second positioning groove extending continuously along its circumference is also provided in the tenon and / or the mortise. A portion of the second sealing ring 4 is disposed in the second positioning groove. This second positioning groove not only restricts the position of the second sealing ring 4, but also increases the contact area between the second positioning groove and the second sealing ring 4 when the second sealing ring 4 is deformed under pressure, thereby improving the sealing effect between the second sealing ring 4 and the first mandrel 3 / second mandrel 6.

[0048] Specifically, in order to further improve the airtightness of the core rod itself, the core rod used for battery casing sealing and leak detection may include multiple second sealing rings 4. The multiple second sealing rings 4 are arranged sequentially at intervals along the axial direction of the first core rod 3 or the second core rod 6. Correspondingly, the first core rod 3 / second core rod 6 is provided with multiple second positioning grooves, and each second sealing ring 4 corresponds to a second positioning groove. More specifically, the second sealing ring 4 is an elastic structure that can undergo recoverable deformation, such as an O-ring rubber ring.

[0049] In a more specific embodiment, in order to meet the helium testing requirements of the mandrel used for battery casing seal leak detection for battery casing 2 of different heights, the mandrel also includes a height adjustment block 8, which is disposed on the second mandrel 6, and the axial position of the height adjustment block 8 on the second mandrel 6 is adjustable. More specifically, the height adjustment block 8 and the second mandrel 6 can be connected via a second fastening connector 7. For example, the second fastening connector 7 can be a positioning pin, bolt, screw, etc.

[0050] More specifically, the second mandrel 6 includes a first mandrel segment 61, a second mandrel segment 62, and a third mandrel segment 63 arranged sequentially along its own axial direction. The radial cross-sectional area of ​​the first mandrel segment 61 is greater than that of the second mandrel segment 62, which is greater than that of the third mandrel segment 63. The third mandrel segment 63 is connected to the first mandrel 62. The height adjustment block 8 is integrally fitted onto the second mandrel segment 62. More specifically, the side of the second mandrel segment 62 has an adjustment groove 64. In the axial direction of the second mandrel 6, the length of the adjustment groove 64 is less than the length of the height adjustment block 8. The height adjustment block 8 spans the adjustment groove 64. The second fastening connector 7 passes through the height adjustment block 8 and connects to the bottom of the adjustment groove 64. Furthermore, the overall radial dimension (diameter) of the second mandrel segment 62 and the height adjustment block 8 is greater than the radial dimension of the first mandrel segment 61. It should be noted that the adjustable range length of the height adjustment block 8 along the axial direction of the second mandrel segment 62 is the length of the adjustment groove 64. More specifically, as a typical implementation, the third core rod segment 63 can be used as a tenon as a whole.

[0051] In a more specific implementation, in order to prevent the core rod from causing scratches or other damage to the battery casing 2 during operation, a protective sleeve is provided at least on the outside of the first core rod 3. The first protective sleeve covers / is embedded on the side of the first core rod 3, and the protective sleeve is made of non-metallic material.

[0052] Specifically, in order to improve the airtightness between the mandrel and other auxiliary mechanisms such as the vacuum pumping mechanism and the helium supply mechanism, a third sealing ring 9 can be provided on the second end face of the mandrel body. In order to improve the structural stability and sealing effect of the third sealing ring 9, a third positioning groove is also provided on the second end face of the mandrel body. Part of the third sealing ring 9 is set in the third positioning groove. More specifically, the third positioning groove and the third sealing ring 9 are arranged around the gas guide channel.

[0053] Specifically, during the helium detection process, the battery casing 2 is fixed, and the mandrel is driven to move upward along the axial direction of the battery casing 2 and enter the battery casing 2. Finally, the first sealing ring 1 at the top of the mandrel contacts the bottom of the battery casing 2. Due to compression, the first sealing ring 1 is tightly attached to the bottom of the battery casing 2, thereby forming an airtight sealed area. The size of this area is adapted to the size of the bottom area to be tested of the battery casing 2, thus cooperating with other functional mechanisms to complete the helium detection of the battery casing 2.

[0054] This utility model provides a mandrel for leak detection of battery casing seals, which can meet the requirements of helium testing for cylindrical battery casings. The mandrel adopts a split structure and uses a sealing ring with a unique cross-section for sealing, meeting the needs of helium testing equipment for smaller diameter cylindrical casings. The mandrel provided in this utility model for leak detection of battery casing seals adopts a split structure, with the upper section being detachable for easy replacement. Furthermore, due to its structural characteristics, the sealing ring in the upper section of the mandrel can be changed to a smaller diameter, thus making it more widely applicable to cylindrical casings of different sizes and greatly improving the applicable detection range of the helium testing equipment.

[0055] This utility model provides a core rod for leak detection of battery casing seals. The upper section of the core rod and the sealing ring are easy to replace, which greatly reduces the maintenance work of the equipment. Moreover, the sealing effect is good, which meets the needs of helium sealing detection in the bottom area of ​​small-diameter circular shells.

[0056] It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A core rod for battery case seal leak detection, characterized by, The application relates to a sealing structure of a core rod, which comprises: a core rod body and a first sealing ring, the core rod body is provided with a first end face and a second end face in the axial direction, the core rod body is internally provided with a gas guide channel, the gas guide channel is in communication with the first end face and the second end face, a first positioning groove is arranged on the side surface of the core rod body close to the first end face, the first positioning groove is arranged around the gas guide channel, the longitudinal direction of the first positioning groove is at an acute angle with the axial direction of the core rod body, a part of the first sealing ring is arranged in the first positioning groove, and the other part of the first sealing ring protrudes outside the first positioning groove and extends above the first end face in the axial direction of the core rod body; when the first sealing ring is in contact with the bottom of a battery shell and is compressed, the first sealing ring can be deformed and tightly fit the groove wall of the first positioning groove, and the other part of the first sealing ring is self-adaptively fit the bottom of the battery shell.

2. The mandrel for battery case seal leak detection of claim 1, wherein: The groove wall of the first positioning groove comprises a first groove wall and a second groove wall, the first groove wall and the second groove wall intersect at a groove bottom, the second groove wall is located between the first groove wall and the first end face, the first groove wall is parallel to the radial section of the core rod body, or the first groove wall is inclined from the end intersecting with the second groove wall in the direction approaching the first end face, and the included angle between the second groove wall and the radial section of the core rod body and the first groove wall is an acute angle.

3. The mandrel for battery case seal leak detection of claim 2, wherein: The first sealing ring is provided with a first side face and a second side face, the first side face is fit the first groove wall, and the second side face is fit the second groove wall.

4. The mandrel for sealing leak detection of a battery case according to claim 1 or 3, wherein: The longitudinal section of the first sealing ring is a triangle or a trapezoid.

5. The mandrel for battery case seal leak detection of claim 1, wherein: The core rod body comprises a first core rod and a second core rod, the first core rod and the second core rod are detachably fixed, the first core rod is internally provided with a first hole section penetrating in the axial direction, the second core rod is internally provided with a second hole section penetrating in the axial direction, the first hole section and the second hole section are in communication and form the gas guide channel, the first end face is located at the end of the first core rod away from the second core rod, the second end face is located at the end of the second core rod away from the first core rod, and the first sealing ring is detachably arranged on the first core rod.

6. The mandrel for battery case seal leak detection of claim 5, wherein: The first core rod and the second core rod are coaxially arranged.

7. The mandrel for battery case seal leak detection of claim 5, wherein: One of the first core rod and the second core rod is provided with a mortise, and the other is provided with a tenon, the tenon is embedded in the mortise.

8. The mandrel for battery case seal leak detection of claim 7, wherein: The first core rod and the second core rod are further connected through a first fastening connecting piece.

9. The mandrel for sealing leak detection of a battery case according to claim 7 or 8, wherein: One of the first hole section and the second hole section further penetrates the tenon, and the one of the first hole section and the second hole section is in communication with the groove bottom of the mortise.

10. The mandrel for sealing leak detection of a battery case according to claim 7 or 8, wherein Further comprising: at least one second sealing ring, the second sealing ring is arranged between the first core rod and the second core rod, and the second sealing ring is in sealing cooperation with the first core rod and the second core rod.

11. The mandrel for battery case seal leak detection of claim 10, wherein: The second sealing ring is arranged between the tenon and the mortise.

12. The mandrel for battery case seal leak detection of claim 11, wherein: The tenon and / or the mortise is further provided with a second positioning groove continuously extending in the circumferential direction, and the second sealing ring is partially arranged in the second positioning groove.

13. The mandrel for battery case seal leak detection of claim 10, wherein: The mandrel for sealing and leak detection of battery shell comprises a plurality of second sealing rings, which are arranged in sequence along the axial direction of the first mandrel or the second mandrel.

14. The mandrel for battery case seal leak detection of claim 7, wherein, Further comprising: A height adjustment block is arranged on the second mandrel, and the axial position of the height adjustment block on the second mandrel is adjustable.

15. The mandrel for battery case seal leak detection of claim 14, wherein: The height adjustment block is connected with the second mandrel through a second fastening connector.

16. The mandrel for battery case seal leak detection of claim 14, wherein: The second mandrel comprises a first mandrel segment, a second mandrel segment and a third mandrel segment arranged in sequence along the axial direction of the second mandrel, the radial cross-sectional area of the first mandrel segment is greater than that of the second mandrel segment, and the radial cross-sectional area of the second mandrel segment is greater than that of the third mandrel segment, the third mandrel segment is connected with the first mandrel, and the height adjustment block is arranged on the second mandrel segment.

17. The mandrel for battery case seal leak detection of claim 16, wherein: The height adjustment block is entirely sleeved on the second mandrel.

18. The mandrel for battery case seal leak detection of claim 16, wherein: The third mandrel segment entirely serves as a tenon.

19. The mandrel for sealing leak testing of battery cases of claim 5, wherein, Further comprising: A protective sleeve is sleeved on the first mandrel.

20. The mandrel for sealing leak testing of battery cases of claim 19, wherein: The protective sleeve is a non-metal member.

21. The mandrel for sealing leak testing of battery cases of claim 19, wherein: The mandrel for sealing and leak detection of battery shell further comprises a third sealing ring arranged on the second end face.

22. An apparatus for leak detection of a battery case seal, comprising: Comprising: A vacuumizing mechanism, a helium gas supplying mechanism, a driving mechanism and the mandrel for sealing and leak detection of battery shell according to any one of claims 1-21, the vacuumizing mechanism and the helium gas supplying mechanism are in communication with the gas guiding channel from one side of the second end face of the mandrel, and the driving mechanism is in transmission cooperation with the mandrel and is used for driving the mandrel to move along the axial direction of the mandrel.

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