Top cover assembly and battery and method of assembling the same

Abstract

The application provides a top cover assembly and a battery and a top cover assembly assembling method. The top cover assembly comprises a shell, a pole, a compression ring and a sealing element. The shell is provided with a mounting hole. The pole is partially arranged in the mounting hole. The compression ring is sleeved on the pole. The compression ring has a compression ring body, a convex part and a concave part. Before a riveting force is applied, an accommodation space is formed between the end of the pole arranged in the mounting hole and the concave part. After the riveting force is applied, the end of the pole arranged in the mounting hole is deformed in a direction close to the concave part to form a pole protrusion and a radially concave annular groove. The pole protrusion is filled in the accommodation space and abuts against the concave part. The sealing element is sleeved on the pole and the compression ring. The sealing element is clamped between the pole and the shell and between the compression ring and the shell. The inclined side wall of the concave part abuts against the side wall of the pole protrusion. The convex part and the concave part are accommodated in the annular groove. The convex part abuts against the groove wall and the groove bottom of the annular groove.

Description

[0001] This application is a divisional application. The original application has the application number 202310644176.X and the original application date is May 31, 2023. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of battery technology, and in particular to a top cover assembly and a method for assembling the battery and the top cover assembly. Background Technology

[0003] Currently, most cylindrical battery top cover assemblies on the market use a pressure ring with a uniform thickness sheet structure to compress the sealing element and ultimately achieve a sealing effect. The main drawback of this structure is that the terminals need to be riveted. On the one hand, riveting can easily cause the terminals to break, increasing the risk of sealing failure due to terminal cracking. On the other hand, the sealing element is usually sandwiched between the cover plate and the terminals. During riveting, the pressure is applied vertically to the sealing element, increasing the risk of sealing failure of the top cover assembly due to damage to the sealing element.

[0004] Therefore, it is necessary to provide a top cover assembly and a battery to improve this defect. Summary of the Invention

[0005] The embodiments of the present invention provide a top cover assembly and a method for assembling the battery and the top cover assembly, which can not only avoid the breakage of the terminal post, but also avoid the pressure acting directly on the seal and causing the seal to be crushed, thereby reducing the risk of seal failure caused by terminal post cracking and seal damage.

[0006] Embodiments of the present invention provide a top cover assembly, comprising: A housing, wherein mounting holes are provided on the housing; The electrode post is inserted into the mounting hole; A pressure ring, sleeved on the pole post, has a pressure ring body, a protrusion, and a recess. The pressure ring body surrounds the outside of the protrusion and the recess. The protrusion protrudes from the surface of the pressure ring body facing the housing and abuts against a portion of the sidewall of the pole post passing through the mounting hole. The pole post is configured such that, before riveting, one end of the pole post passing through the mounting hole forms a receiving space between it and the recess; after riveting, the end of the pole post passing through the mounting hole deforms along a direction close to the recess to form a pole post protrusion and a radially recessed annular groove. The pole post protrusion fills the receiving space and abuts against the recess, while the protrusion abuts against the groove wall and bottom of the annular groove. A sealing element, which is sleeved on the pole post and the pressure ring, and is sandwiched between the pole post and the housing and between the pressure ring and the housing; The recess has an inclined sidewall that is connected to the surface of the pressure ring body away from the housing and abuts against the protruding sidewall of the pole post.

[0007] In one embodiment, the recess has a bottom wall that is angled to and connected to the inclined side wall. The pole post protrusion has a first side wall and a second side wall connected to the first side wall. The first side wall is inclined, and the second side wall is angled to the first side wall. The first side wall abuts against the inclined side wall, and the second side wall abuts against the bottom wall. In one embodiment, the angle between the inclined side wall and the surface of the pressure ring body facing away from the housing is greater than or equal to 30 degrees and less than 90 degrees.

[0008] In one embodiment, the pole has a pole body and an extension. The extension is disposed on the surface of the pole body facing the housing and passes through the mounting hole. After being riveted, the extension forms the annular groove and the pole protrusion. The protrusion abuts against the groove wall and the bottom of the annular groove, and the pole protrusion abuts against the recess.

[0009] In one embodiment, the seal includes: A first sealing element has a first main body and a first bent portion. The first main body surrounds the outside of the first bent portion. The first main body is sandwiched between the pole body and the surface of the housing facing the pole body. The first bent portion is sandwiched between the extension and the wall of the mounting hole. The second sealing element has a second main body and a second bent portion. The second main body surrounds the outside of the second bent portion and is sandwiched between the pressure ring body and the surface of the housing facing the pressure ring body. The second bent portion is sandwiched between the protrusion and the wall of the mounting hole, and the first bent portion abuts against the second bent portion.

[0010] In one embodiment, the first seal further includes a third bend that surrounds the outer side of the first body portion and encloses the circumferential surface of the pole body.

[0011] In one embodiment, the surface of the extension away from the pole body is flush with the surface of the pressure ring body away from the housing.

[0012] In one embodiment, the sealing element is provided with at least one limiting protrusion, and at least one of the pole post and the pressure ring is provided with a limiting groove, the limiting protrusion being located within the limiting groove; or, the sealing element is provided with at least one limiting groove, and at least one of the pole post and the pressure ring is provided with a limiting protrusion, the limiting protrusion being located within the limiting groove.

[0013] In one embodiment, the pole has a pole body and an extension, and the limiting groove is provided on the portion of the pole body facing the housing and connecting with the extension; and / or, the limiting groove is provided on the portion of the pressure ring body facing the housing and connecting with the protrusion.

[0014] In one embodiment, the pole post has a pole post body and an extension; The diameter of the pole body is greater than or equal to 12 mm and less than or equal to 20 mm.

[0015] In one embodiment, the thickness of the pole body is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

[0016] In one embodiment, the diameter of the end of the extension away from the pole body is greater than or equal to 8 mm and less than or equal to 13 mm.

[0017] In one embodiment, the inner ring diameter of the pressure ring is greater than or equal to 5 mm and less than or equal to 10 mm.

[0018] In one embodiment, the outer ring diameter of the pressure ring is greater than or equal to 12 mm and less than or equal to 20 mm.

[0019] In one embodiment, the thickness of the pressure ring body is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

[0020] In one embodiment, the protrusion extends into the mounting hole, and the portion of the seal extending into the mounting hole is respectively sandwiched between the outer peripheral surface of the protrusion and the sidewall of the mounting hole, and between the portion of the pole extending into the mounting hole and the sidewall of the mounting hole.

[0021] In one embodiment, the projection of the surface of the pole contacting the inner circumferential surface of the protrusion along the radial direction of the mounting hole is located on the wall of the mounting hole, and the projection of the surface of the pole contacting the side of the protrusion away from the recess along the radial direction of the mounting hole is located on the wall of the mounting hole.

[0022] In one embodiment, the outer ring diameter of the pressure ring is smaller than the outer ring diameter of the portion of the seal located inside the housing.

[0023] In one embodiment, the hardness of the pressure ring is greater than the hardness of the electrode post, and the strength of the pressure ring is greater than the strength of the electrode post.

[0024] In one embodiment, the contact surface between the pole and the protrusion is located within the mounting hole, and the seal fills the gap in the contact surface.

[0025] In one embodiment, the seal includes a resilient seal that fills the space between the pole and the housing, and between the pressure ring and the housing.

[0026] In one embodiment, the seal includes a second body portion located inside the housing, wherein the outer ring diameter of the second body portion is larger than the outer ring diameter of the pressure ring.

[0027] According to the top cover assembly provided in the above embodiments of the present invention, the embodiments of the present invention also provide a battery, which includes the top cover assembly as described above.

[0028] Embodiments of the present invention also provide a method for assembling a top cover assembly, comprising the following steps: Provide housing, pole, pressure ring and seals; Assemble the housing, the pole, the pressure ring, and the seal; The pole post is riveted to prepare the top cover assembly described in any of the above-mentioned embodiments.

[0029] In one embodiment, the housing is provided with mounting holes; The pole has a pole body and an extension connected along the axial direction; The pressure ring has a pressure ring body, a protrusion and a recess. The pressure ring body surrounds the outside of the protrusion and the recess. The protrusion protrudes from one side surface of the pressure ring body, and the recess is recessed into the other side surface of the pressure ring body.

[0030] In one embodiment, assembling the housing, the pole, the pressure ring, and the seal includes the following steps: The electrode post portion is inserted into the mounting hole, the electrode post body is disposed on one side surface of the housing, and the extension portion is inserted into the mounting hole; The pressure ring is sleeved on the pole post. The protrusion protrudes from the surface of the pressure ring body facing the housing, and the protrusion abuts against the part of the side wall of the pole post passing through the mounting hole. The recess is recessed into the surface of the pressure ring body away from the housing. One end of the pole post passing through the mounting hole forms a receiving space with the recess. The sealing element is fitted onto the pole and the pressure ring.

[0031] In one embodiment, riveting the pole post includes the following steps: An axial pressure is applied from bottom to top to the side of the extension away from the pole body. Under the pressure, the extension deforms in the direction close to the recess. The material of the extension flows radially into the receiving space to form a pole protrusion and a radially recessed annular groove. The pole protrusion fills the receiving space and abuts against the recess. The protrusion and the recess are received in the annular groove. The protrusion abuts against the groove wall and the bottom of the annular groove. The sealing element is sandwiched between the pole and the housing and between the pressure ring and the housing.

[0032] The beneficial effects of this invention are: In this invention, the top cover assembly includes a housing, an electrode post, a pressure ring, and a seal. The housing has a mounting hole, and the electrode post passes through this hole. The pressure ring is fitted onto the electrode post and has a body, a protrusion, and a recess. The body surrounds the outside of the protrusion and recess. The protrusion protrudes from the surface of the body facing the housing and abuts against the sidewall of the electrode post passing through the mounting hole. The recess is recessed into the surface of the body away from the housing. By configuring the electrode post such that, before riveting, one end of the electrode post passing through the mounting hole forms a receiving space with the recess; after riveting, the end of the electrode post passing through the mounting hole deforms along the direction closer to the recess to form a protrusion and an annular groove. The protrusion fills the receiving space and abuts against the recess. The protrusion and the recess are received in the annular groove. The protrusion abuts against part of the groove wall of the annular groove, which can limit the distance between the pressure ring and the housing. The seal is sleeved on the pole and the pressure ring. The seal is sandwiched between the pole and the housing and between the pressure ring and the housing, which can ensure that the seal reaches a certain amount of compression. The recess has an inclined sidewall. The inclined sidewall is connected to the surface of the pressure ring body away from the housing. The inclined sidewall abuts against the sidewall of the protruding pole. This can not only prevent the pole from breaking, but also prevent the pressure during riveting from acting vertically on the seal and causing the seal to be crushed. This can reduce the risk of the top cover assembly sealing failure due to pole cracking and seal crushing. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A partial external view of the top cover assembly provided for an embodiment of the present invention; Figure 2A cross-sectional view of the top cover assembly before riveting, provided for an embodiment of the present invention; Figure 3 A cross-sectional view of the top cover assembly provided for an embodiment of the present invention; Figure 4 A cross-sectional view of the pole provided for an embodiment of the present invention; Figure 5 A cross-sectional view of the pressure ring provided for an embodiment of the present invention; Figure 6 A schematic diagram of pressure decomposition provided for an embodiment of the present invention; Figure 7 A schematic diagram of the dimensions of the top cover assembly provided for an embodiment of the present invention.

[0035] The names of the components corresponding to the corresponding reference numerals in the figure are: 100-Top cover assembly; 1-Housing; 11-Mounting hole; 2-Pole post; 21-Annular groove; 211-Groove wall; 212-Groove bottom; 22-Pole post body; 221-First limiting groove; 23-Extension; 230-Pole post protrusion; 231-First side wall; 232-Second side wall; 3-Pressure ring; 31-Pressure ring body; 311-Second limiting groove; 32-Protrusion; 33-Recess; 330-Accommodation space; 331-Inclined side wall; 332-Bottom wall; 4-Seal; 41-First seal; 411-First main body; 412-First bend; 413-Third bend; 414-First limiting protrusion; 42-Second seal; 421-Second main body; 422-Second bend; 423-Second limiting protrusion. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0037] An embodiment of the present invention provides a top cover assembly; please refer to [link / reference]. Figure 1 and Figure 3 , Figure 1 This is a partial external view of the top cover assembly provided for an embodiment of the present invention. Figure 3The cross-sectional view of the top cover assembly provided in the embodiment of the present invention shows that the top cover assembly 100 includes a housing 1, a pole post 2, a pressure ring 3, and a sealing element 4. The housing 1 is provided with a mounting hole 11, and the pole post 2 partially passes through the mounting hole 11.

[0038] The pressure ring 3 is sleeved on the pole post 2. The pressure ring 3 has a pressure ring body 31, a protrusion 32 and a concave portion 33. The pressure ring body 31 and the pole post body 22 are respectively disposed on opposite side surfaces of the housing 1. The pressure ring body 31 surrounds the outside of the protrusion 32 and the concave portion 33. The protrusion 32 protrudes from the surface of the pressure ring body 31 facing the housing 1. The protrusion 32 abuts against the part of the side wall of the pole post 2 that passes through the mounting hole 11. The concave portion 33 is recessed in the surface of the pressure ring body 31 away from the housing 1.

[0039] Please see Figure 2 , Figure 2 A cross-sectional view of the top cover assembly provided in some embodiments before riveting is shown. The pole post 2 is configured such that, before being subjected to non-riveting force, one end of the pole post 2 passing through the mounting hole 11 forms a receiving space 330 between the pole post 2 and the recess 33.

[0040] Please see Figure 3 After being subjected to riveting force, the end of the pole post 2 that passes through the mounting hole 11 deforms in the direction close to the recess 33 to form a pole post protrusion 230. The pole post protrusion 230 fills the receiving space 330 and abuts against the recess 33.

[0041] The sealing element 4 is sleeved on the pole post 2 and the pressure ring 3, and is sandwiched between the pole post 2 and the housing 1, and between the pressure ring 3 and the housing 1. The pole post 2 is connected to the pressure ring 3 and the housing 1 by riveting. When the pole post 2 passes through the mounting hole 11, the sealing element 4 sleeved on the pole post 2 and the pressure ring 3 is squeezed by the housing 1, the pole post 2 and the pressure ring 3 and undergoes elastic deformation. The elastic deformation of the sealing element 4 fills the gap between the housing 1 and the pole post 2 and the pressure ring 3, realizing the sealed connection between the housing 1 and the pole post 2 and the pressure ring 3, while also insulating the housing 1 from the pole post 2 and the pressure ring 3.

[0042] In this embodiment, the pole post 2 has a pole post body 22 and an extension 23. The pole post body 22 is disposed on one side surface of the housing 1, and the extension 23 is disposed on the surface of the pole post body 22 facing the housing 1. The extension 23 and the pole post body 22 are integrally formed, and the extension 23 passes through the mounting hole 11.

[0043] Please see Figure 2Before being subjected to non-riveting force, the extension 23 passes through the mounting hole 11 and the pressure ring 3. The end surface of the extension 23 away from the pole post body 22 protrudes from the surface of the pressure ring body 31 away from the housing 1. The protrusion 32 of the pressure ring 3 extends into the mounting hole 11. The upper surface and the inner ring surface of the protrusion 32 abut against the extension 23 respectively. The side wall of the extension 23 and the recess 33 of the pressure ring 3 enclose and form an annular receiving space 330.

[0044] Combination Figure 2 and Figure 3 As shown, during the riveting process, an application such as... is applied to the extension 23. Figure 2 Under pressure in the direction indicated by the vertical arrow, the extension 23 deforms along the direction close to the recess 33, and the material of the extension 23... Figure 2 The material flows in the direction indicated by the horizontal arrow into the receiving space 330, forming a pole post protrusion 230. The pole post protrusion 230 fills the receiving space 330 and abuts against the recess 33. By flattening the end of the extension 23 away from the pole post body 22, the pole post height can be reduced. After riveting, an annular groove 21 is formed radially recessed on the circumferential surface of the extension 23. The annular groove 21 accommodates the protrusion 32 and the recess 33, and the protrusion 32 abuts against the groove wall 211 and the groove bottom 212 of the annular groove 21. The end of the extension 23 away from the pole post body 22 forms a T-shaped structure as shown in the figure. The T-shaped structure can limit the distance between the pressure ring 3 and the housing 1, as well as the distance between the pole post body 22 and the housing 1, thereby ensuring that the seal 4 achieves a certain amount of compression.

[0045] In this embodiment, the projection of the surface of the pole post 2 in contact with the inner circumferential surface of the protrusion 32 along the radial direction of the mounting hole 11 is located on the wall of the mounting hole 11, and the projection of the surface of the pole post 2 in contact with the side of the protrusion 32 away from the recess 33 along the radial direction of the mounting hole 11 is located on the wall of the mounting hole 11. In this structure, the contact surface between the pole post 2 and the pressure ring 3 is located within the mounting hole 11 of the housing 1, and not at the upper or lower end of the housing 1. The gap between the contact surface of the pole post 2 and the pressure ring 3 can be sealed using the sealing element 4. That is, the sealing element 4 fills the gap between the contact surface of the pole post 2 and the pressure ring 3, thereby achieving a better sealing effect.

[0046] In this embodiment, the hardness of the pressure ring 3 is greater than that of the pole post 2, and the strength of the pressure ring 3 is greater than that of the pole post 2. This ensures that the pressure ring 3 will not deform under stress during the riveting process. The pole post 2 and the pressure ring 3 are made of different materials. For example, the pole post 2 can be, but is not limited to, 3-series H14 aluminum, and the pressure ring 3 can be, but is not limited to, 5-series H32 aluminum.

[0047] Furthermore, such as Figure 3As shown, the protrusion 32 extends into the mounting hole 11, and the portion of the seal 4 extending into the mounting hole 11 is respectively sandwiched between the outer peripheral surface of the protrusion 32 and the side wall of the mounting hole 11, and between the portion of the pole post 2 extending into the mounting hole 11 and the side wall of the mounting hole 11. With this structure, the sealing ring can be avoided from being sandwiched between the surfaces of the protrusion 32 of the housing 1 and the surface away from the recess 33. During pole post riveting, the vertical force of the pole post protrusion 230 is transmitted to the seal 4 via the pressure ring body 31 after acting on the protrusion 32, rather than being directly applied to the seal 4, thus preventing the seal 4 from being crushed.

[0048] In some embodiments, such as Figure 3 As shown, the sealing element 4 includes a first sealing element 41 and a second sealing element 42. The first sealing element 41 has a first main body portion 411 and a first bent portion 412. The first main body portion 411 surrounds the outside of the first bent portion 412. The first main body portion 411 is sandwiched between the pole post body 22 and the surface of the housing 1 facing the pole post body 22. The first bent portion 412 extends into the mounting hole 11 and is sandwiched between the outer peripheral surface of the extension portion 23 and the hole wall of the mounting hole 11.

[0049] The second seal 42 has a second main body portion 421 and a second bent portion 422. The second main body portion 421 surrounds the outside of the second bent portion 422. The second main body portion 421 is sandwiched between the pressure ring body 31 and the surface of the housing 1 facing the pressure ring body 31. The second bent portion 422 extends into the mounting hole 11 and is sandwiched between the outer peripheral surface of the protrusion 32 and the hole wall of the mounting hole 11.

[0050] In this embodiment, the first sealing element 41 and the second sealing element 42 are two independent sealing rings. The materials of both the first sealing element 41 and the second sealing element 42 can be, but are not limited to, elastic rubber. The first sealing element 41 and the second sealing element 42 can abut against each other through the first bending portion 412 and the second bending portion 422. By compressing the first sealing element 41 and the second sealing element 42, they undergo elastic deformation, thereby filling the gap between the housing 1 and the pole post 2 and the pressure ring 3, thus achieving a sealing effect. That is, the sealing element 4 can include an elastic sealing element that fills the gap between the pole post 2 and the housing 1, and between the pressure ring 3 and the housing 1.

[0051] In one embodiment, such as Figure 3 As shown, the first seal 41 also includes a third bend 413, which surrounds the outside of the first main body 411 and encloses the circumferential surface of the pole body 22.

[0052] In one embodiment, the surface of the extension 23 away from the terminal body 22 is flush with the surface of the pressure ring body 31 away from the housing 1. Under this structure, the thickness of the top cover assembly can be reduced, thereby reducing the height space occupied by the top cover assembly inside the battery, which is beneficial to improving the performance of the battery.

[0053] In some other embodiments, the surface of the extension 23 away from the electrode body 22 may not be flush with the surface of the pressure ring body 31 away from the housing 1. For example, the surface of the extension 23 away from the electrode body 22 may be higher than the surface of the pressure ring body 31 away from the housing 1, or the surface of the extension 23 away from the electrode body 22 may be lower than the surface of the pressure ring body 31 away from the housing 1.

[0054] Furthermore, the seal 4 is provided with at least one limiting protrusion, and at least one of the pole post 2 and the pressure ring 3 is provided with a limiting groove, with the limiting protrusion located in the limiting groove.

[0055] In one embodiment, combined Figure 3 and Figure 4 As shown, Figure 4 A cross-sectional view of the pole provided in an embodiment of the present invention shows that the surface of the pole body 22 facing the housing 1 and the portion where it connects with the extension 23 are provided with a first limiting groove 221, and a first limiting protrusion 414 is provided on the first main body portion 411 of the first sealing member 41, and the first limiting protrusion 414 is located in the first limiting groove 221.

[0056] In one embodiment, combined Figure 3 and Figure 5 As shown, Figure 5 A cross-sectional view of the pressure ring provided in an embodiment of the present invention shows that the surface of the pressure ring body 31 facing the housing 1 and the portion that connects with the protrusion 32 is provided with a second limiting groove 311, and the second main body 421 of the second sealing member 42 is provided with a second limiting protrusion 423, which is located in the second limiting groove 311.

[0057] In one embodiment, a first limiting groove 221 is provided on the surface of the pole body 22 facing the housing 1 and connecting with the extension 23. A first limiting protrusion 414 is provided on the first main body 411 of the first sealing member 41, and the first limiting protrusion 414 is located within the first limiting groove 221. A second limiting groove 311 is provided on the surface of the pressure ring body 31 facing the housing 1 and connecting with the protrusion 32. A second limiting protrusion 423 is provided on the second main body 421 of the second sealing member 42, and the second limiting protrusion 423 is located within the second limiting groove 311.

[0058] In practical applications, the limiting protrusion can be provided not only on the sealing element 4, and the limiting groove can be provided not only on the pole post 2 or the pressure ring 3. At least one limiting groove can be provided on the sealing element 4, and a limiting protrusion can be provided on at least one of the pole post 2 and the pressure ring 3. The limiting protrusion of the pole post 2 or the pressure ring 3 is located in the limiting groove of the sealing element 4.

[0059] In one embodiment, such as Figure 7 As shown, Figure 7 The schematic diagram of the top cover assembly provided in the embodiment of the present invention shows that, in order to meet the assembly process, the diameter D1 of the pole body 22 is greater than or equal to 12 mm and less than or equal to 20 mm, the thickness T2 of the pole body 22 is greater than or equal to 0.7 mm and less than or equal to 1.5 mm, the diameter D3 of the end of the extension 23 away from the pole body 22 is greater than or equal to 8 mm and less than or equal to 13 mm, the inner ring diameter D2 of the pressure ring 3 is greater than or equal to 5 mm and less than or equal to 10 mm, the outer ring diameter D4 of the pressure ring 3 is greater than or equal to 12 mm and less than or equal to 20 mm, and the thickness T1 of the pressure ring body 31 is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

[0060] In one embodiment, combined Figures 3 to 7 As shown, the recess 33 has an inclined sidewall 331, which abuts against the sidewall of the pole post protrusion 230. The inclined sidewall 331 is connected to the bottom surface of the recess 33 and the surface of the pressure ring body 31 away from the housing 1.

[0061] In one embodiment, the included angle α between the inclined sidewall 331 and the surface of the pressure ring body 31 facing away from the housing 1 is greater than or equal to 30 degrees and less than 90 degrees. For example, the included angle α between the inclined sidewall 331 and the surface of the pressure ring body 31 facing away from the housing 1 can be, but is not limited to, 30°, 50°, 60°, 70°, 80°, 85°, or 89°. Setting the inclined sidewall 331 to have a certain slope is more conducive to demolding during the pressure ring stamping process, and it is more in line with the principle of material flow during the pole riveting process, so that the pole protrusion 230 can better fill the accommodating space 330 and avoid the formation of air holes. In addition, since the part of the pressure ring 3 that contacts the pole 2 (i.e., the inclined sidewall 331 and the recess 33) is inclined, during riveting, the pressure will not be applied perpendicularly to the seal 4, but will be applied to the recess 33 and the inclined sidewall 331. In this way, the seal 4 will not be directly damaged during the riveting process, and thus the sealing function of the top cover assembly will not be compromised.

[0062] The recess 33 also has a bottom wall 332, which is angled to and connected to the inclined side wall 331. Specifically, the bottom wall 332 is parallel to the surface of the pressure ring body 31 facing away from the housing 1, and both are perpendicular to the axial direction of the mounting hole 11. The inclined side wall 331 is located between the surface of the pressure ring body 31 facing away from the housing 1 and the bottom wall 332, and is connected to both the surface of the pressure ring body 31 facing away from the housing 1 and the bottom wall 332. The end of the bottom wall 332 away from the inclined side wall 331 is connected to the inner ring side wall of the pressure ring 3. The angle between the bottom wall 332 and the inclined side wall 331 is the same as the angle α between the inclined side wall 331 and the surface of the pressure ring body 31 facing away from the housing 1.

[0063] The pole post protrusion 230 has a first sidewall 231 and a second sidewall 232 connected to the first sidewall 231. The first sidewall 231 is inclined, and the inclination angle of the first sidewall 231 is the same as that of the inclined sidewall 331, that is, the first sidewall 231 is parallel to the inclined sidewall 331 and abuts against the inclined sidewall 331. The second sidewall 232 is set at an angle to the first sidewall 231, and the angle between the first sidewall 231 and the second sidewall 232 is the same as the angle α between the inclined sidewall 331 and the surface of the pressure ring body 31 facing away from the housing 1. The second sidewall 232 is perpendicular to the axial direction of the mounting hole 11 and abuts against the bottom wall 332.

[0064] Combination Figure 6 As shown, during the riveting process, pressure is applied to the pole post 2 in the direction indicated by the vertical arrow. The vertical pressure at the recess 33 can be decomposed into forces acting in two directions: the inclined sidewall 331 and the bottom wall 332. This avoids the pressure acting vertically on the seal 4, thereby preventing the seal 4 from being damaged during the riveting process.

[0065] In one embodiment, the outer ring diameter of the pressure ring 3 is smaller than the outer ring diameter of the portion of the seal 4 located inside the housing 1.

[0066] Combination Figure 3 and Figure 7 As shown, the portion of the seal 4 located inside the housing 1 is the second main body 421 of the second seal 42. The outer ring diameter of the second main body 421 is larger than the outer ring diameter D4 of the pressure ring 3, and the outer ring of the second main body 421 extends beyond the outer ring of the pressure ring 3. Since the seal 4 will be deformed by compression during the riveting process, this embodiment ensures that the seal 4 can fill the gap between the inner portion of the housing 1 and the outer ring edge of the pressure ring 3 by making the outer ring diameter of the pressure ring 3 smaller than the outer ring diameter of the portion of the seal 4 located inside the housing 1. This avoids a large gap between the housing 1 and the outer ring edge of the pressure ring 3 due to the deformation of the seal 4 under force, thereby further improving the sealing effect of the top cover assembly.

[0067] Embodiments of the present invention also provide a battery, which is a cylindrical battery. The battery may include, but is not limited to, a cell, a bottom cover assembly, and a top cover assembly. The bottom cover assembly and the top cover assembly are respectively disposed at both ends of the cell's housing. The top cover assembly is electrically connected to the cell and insulated from the cell's housing, while the bottom cover assembly abuts against the cell and is electrically connected to the cell's housing. The top cover assembly in the battery can be the top cover assembly in any of the above embodiments, and the structure of the top cover assembly can refer to the above embodiments, which will not be described in detail here.

[0068] Embodiments of the present invention also provide a method for assembling a top cover assembly; please refer to [link to relevant documentation]. Figure 2 and Figure 3 The assembly method includes the following steps: S1 provides housing 1, pole post 2, pressure ring 3 and seal 4.

[0069] The housing 1 is provided with a mounting hole 11; the pole post 2 has a pole post body 22 and an extension 23 connected along the axial direction; the pressure ring 3 has a pressure ring body 31, a protrusion 32 and a recess 33, the pressure ring body 31 surrounds the outside of the protrusion 32 and the recess 33, the protrusion 32 protrudes from one side surface of the pressure ring body 31, and the recess 33 is recessed into the other side surface of the pressure ring body 31.

[0070] S2, assemble housing 1, pole post 2, pressure ring 3 and seal 4.

[0071] Specifically, the electrode post 2 is partially inserted into the mounting hole 11, the electrode post body 22 is located on one side surface of the housing 1, and the extension 23 is inserted into the mounting hole 11; the pressure ring 3 is sleeved on the electrode post 2, the protrusion 32 protrudes from the surface of the pressure ring body 31 facing the housing 1, and the protrusion 32 abuts against the side wall of the electrode post 2 inserted into the mounting hole 11, and the recess 33 is recessed into the surface of the pressure ring body 31 away from the housing 1, and a receiving space 330 is formed between the end of the electrode post 2 inserted into the mounting hole 11 and the recess 33; the sealing member 4 is sleeved on the electrode post 2 and the pressure ring 3.

[0072] S3, rivet the pole post 2 to prepare the top cover assembly 100 as described in any of the above.

[0073] Specifically, an axial pressure from bottom to top is applied to the side of the extension 23 away from the pole body 22. Under the pressure, the extension 23 deforms along the direction close to the recess 33. The material of the extension 23 flows radially into the receiving space 330 to form the pole protrusion 230 and the radially recessed annular groove 21. The pole protrusion 230 fills the receiving space 330 and abuts against the recess 33. The protrusion 32 and the recess 33 are received in the annular groove 21. The protrusion 32 abuts against the groove wall 211 and the groove bottom 212 of the annular groove 21. The sealing member 4 is sandwiched between the pole 2 and the housing 1 and between the pressure ring 3 and the housing 1.

[0074] In this embodiment, the direction of the pressure applied during riveting is as follows: Figure 2 As shown by the vertical arrow, the material flow direction of the extension 23 is as follows: Figure 2 As indicated by the horizontal arrow in the middle. (Combined) Figure 6 As shown, during riveting, the vertical pressure is decomposed at the recess 33 into forces acting in two directions: the inclined sidewall 331 and the bottom wall 332. The pressure will not act perpendicularly on the seal 4, which can prevent the seal 4 from being crushed during the riveting process. At the same time, the material of the extension 23 flows radially to fill the accommodating space 330, and the pole post 2 is not easy to break, thereby reducing the risk of sealing failure of the top cover assembly 100.

[0075] The beneficial effects of this invention are as follows: In this invention, the top cover assembly includes a housing, an electrode post, a pressure ring, and a seal. The housing has a mounting hole, and the electrode post passes through the mounting hole. The pressure ring is fitted onto the electrode post. The pressure ring has a pressure ring body, a protrusion, and a recess. The pressure ring body surrounds the outside of the protrusion and the recess. The protrusion protrudes from the surface of the pressure ring body facing the housing, and the protrusion abuts against the sidewall of the electrode post passing through the mounting hole. The recess is recessed into the surface of the pressure ring body facing away from the housing. By arranging the electrode post such that, before riveting, one end of the electrode post passing through the mounting hole forms a receiving space between it and the recess; after riveting, the electrode post… One end, which passes through the mounting hole, deforms along the direction close to the recess to form a pole post protrusion. The pole post protrusion fills the receiving space and abuts against the recess, and the seal is fitted onto the pole post and the pressure ring. The seal is sandwiched between the pole post and the housing and between the pressure ring and the housing. The recess has an inclined sidewall, which is connected to the surface of the pressure ring body away from the housing. The inclined sidewall abuts against the sidewall of the pole post protrusion. This not only prevents the pole post from breaking, but also prevents the pressure during riveting from acting vertically on the seal and causing it to be crushed. This reduces the risk of the top cover assembly failing to seal due to pole post cracking or seal crushing.

[0076] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A top cover assembly (100), characterized in that, include: The housing (1) has mounting holes (11). The pole post (2) is partially inserted into the mounting hole (11); A pressure ring (3) is fitted onto the pole post (2). The pressure ring (3) has a pressure ring body (31), a protrusion (32), and a recess (33). The pressure ring body (31) surrounds the outside of the protrusion (32) and the recess (33). The protrusion (32) protrudes from the surface of the pressure ring body (31) facing the housing (1), and the protrusion (32) abuts against the side wall of the pole post (2) passing through the mounting hole (11). The recess (33) is recessed into the surface of the pressure ring body (31) away from the housing (1). The pole post (2) is configured such that, before being subjected to non-riveting force, the pole post... (2) One end of the pole (2) passing through the mounting hole (11) forms a receiving space (330) between it and the recess (33); after being riveted, the end of the pole (2) passing through the mounting hole (11) deforms along the direction close to the recess (33) to form a pole protrusion (230) and a radially recessed annular groove (21). The pole protrusion (230) fills the receiving space (330) and abuts against the recess (33). The protrusion (32) and the recess (33) are received in the annular groove (21). The protrusion (32) abuts against the groove wall (211) and the groove bottom (212) of the annular groove (21). as well as A sealing element (4) is sleeved on the pole post (2) and the pressure ring (3), and the sealing element (4) is sandwiched between the pole post (2) and the housing (1) and between the pressure ring (3) and the housing (1); The recess (33) has an inclined sidewall (331) which is connected to the surface of the pressure ring body (31) away from the housing (1) and the inclined sidewall (331) abuts against the sidewall of the pole post protrusion (230).

2. The top cover assembly (100) as claimed in claim 1, characterized in that, The recess (33) has a bottom wall (332), which is set at an angle to the inclined side wall (331) and connected to the inclined side wall (331). The pole post protrusion (230) has a first side wall (231) and a second side wall (232) connected to the first side wall (231). The first side wall (231) is inclined, and the second side wall (232) is set at an angle to the first side wall (231). The first side wall (231) abuts against the inclined side wall (331), and the second side wall (232) abuts against the bottom wall (332).

3. The top cover assembly (100) as claimed in claim 1, characterized in that, The angle between the inclined sidewall (331) and the surface of the pressure ring body (31) facing away from the housing (1) is greater than or equal to 30 degrees and less than 90 degrees.

4. The top cover assembly (100) as claimed in claim 1, characterized in that, The pole post (2) has a pole post body (22) and an extension (23). The extension (23) is disposed on the surface of the pole post body (22) facing the housing (1) and passes through the mounting hole (11). After being riveted, the extension (23) forms the annular groove (21) and the pole post protrusion (230). The protrusion (32) abuts against the groove wall (211) and the groove bottom (212) of the annular groove (21), and the pole post protrusion (230) abuts against the recess (33).

5. The top cover assembly (100) as claimed in claim 4, characterized in that, The seal (4) includes: The first sealing element (41) has a first main body (411) and a first bent portion (412). The first main body (411) surrounds the outside of the first bent portion (412). The first main body (411) is sandwiched between the pole body (22) and the surface of the housing (1) facing the pole body (22). The first bent portion (412) is sandwiched between the extension (23) and the wall of the mounting hole (11). The second sealing element (42) has a second main body (421) and a second bent portion (422). The second main body (421) surrounds the outside of the second bent portion (422). The second main body (421) is sandwiched between the pressure ring body (31) and the surface of the housing (1) facing the pressure ring body (31). The second bent portion (422) is sandwiched between the protrusion (32) and the wall of the mounting hole (11). The first bent portion (412) abuts against the second bent portion (422).

6. The top cover assembly (100) as claimed in claim 5, characterized in that, The first seal (41) further includes a third bend (413) which surrounds the outside of the first main body (411) and encloses the circumferential surface of the pole body (22).

7. The top cover assembly (100) as claimed in claim 5, characterized in that, The surface of the extension (23) facing away from the pole body (22) is flush with the surface of the pressure ring body (31) facing away from the housing (1).

8. The top cover assembly (100) as claimed in claim 1, characterized in that, The sealing element (4) is provided with at least one limiting protrusion, and at least one of the pole post (2) and the pressure ring (3) is provided with a limiting groove, and the limiting protrusion is located in the limiting groove; or The sealing element (4) is provided with at least one limiting groove, and at least one of the pole post (2) and the pressure ring (3) is provided with a limiting protrusion, which is located in the limiting groove.

9. The top cover assembly (100) as claimed in claim 8, characterized in that, The pole post (2) has a pole post body (22) and an extension (23). The portion of the pole post body (22) facing the housing (1) and connected to the extension (23) is provided with the limiting groove; and / or, the portion of the pressure ring body (31) facing the housing (1) and connected to the protrusion (32) is provided with the limiting groove.

10. The top cover assembly (100) as claimed in claim 1, characterized in that, The pole post (2) has a pole post body (22) and an extension (23). The diameter of the pole body (22) is greater than or equal to 12 mm and less than or equal to 20 mm.

11. The top cover assembly (100) as claimed in claim 10, characterized in that, The thickness of the pole body (22) is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

12. The top cover assembly (100) as claimed in claim 10, characterized in that, The diameter of the end of the extension (23) away from the pole body (22) is greater than or equal to 8 mm and less than or equal to 13 mm.

13. The top cover assembly (100) as claimed in claim 10, characterized in that, The inner diameter of the pressure ring (3) is greater than or equal to 5 mm and less than or equal to 10 mm.

14. The top cover assembly (100) as claimed in claim 10, characterized in that, The outer diameter of the pressure ring (3) is greater than or equal to 12 mm and less than or equal to 20 mm.

15. The top cover assembly (100) as claimed in claim 10, characterized in that, The thickness of the pressure ring body (31) is greater than or equal to 0.7 mm and less than or equal to 1.5 mm.

16. The top cover assembly (100) as claimed in claim 1, characterized in that, The protrusion (32) extends into the mounting hole (11), and the portion of the seal (4) extending into the mounting hole (11) is respectively sandwiched between the outer peripheral surface of the protrusion (32) and the side wall of the mounting hole (11) and the portion of the pole (2) extending into the mounting hole (11) and the side wall of the mounting hole (11).

17. The top cover assembly (100) as claimed in claim 1, characterized in that, The projection of the surface of the pole post (2) that contacts the inner circumferential surface of the protrusion (32) along the radial direction of the mounting hole (11) is located on the hole wall of the mounting hole (11), and the projection of the surface of the pole post (2) that contacts the side of the protrusion (32) away from the recess (33) along the radial direction of the mounting hole (11) is located on the hole wall of the mounting hole (11).

18. The top cover assembly (100) as claimed in claim 1, characterized in that, The outer ring diameter of the pressure ring (3) is smaller than the outer ring diameter of the portion of the seal (4) located inside the housing (1).

19. The top cover assembly (100) as claimed in claim 1, characterized in that, The hardness of the pressure ring (3) is greater than that of the pole post (2), and the strength of the pressure ring (3) is greater than that of the pole post (2).

20. The top cover assembly (100) as claimed in claim 1, characterized in that, The contact surface between the pole post (2) and the protrusion (32) is located inside the mounting hole (11), and the seal (4) fills the gap of the contact surface.

21. The top cover assembly (100) as claimed in claim 1, characterized in that, The seal (4) includes an elastic seal that fills the space between the pole post (2) and the housing (1) and between the pressure ring (3) and the housing (1).

22. The top cover assembly (100) as claimed in claim 1, characterized in that, The sealing element (4) includes a second main body (421) located inside the housing (1), wherein the outer ring diameter of the second main body (421) is larger than the outer ring diameter of the pressure ring (3).

23. A battery, characterized in that, Includes the top cover assembly (100) as described in any one of claims 1 to 22.

24. A method for assembling a top cover assembly, characterized in that, Includes the following steps: Provide housing (1), pole post (2), pressure ring (3) and seal (4); Assemble the housing (1), the pole post (2), the pressure ring (3), and the seal; The pole post (2) is riveted to prepare the top cover assembly (100) as described in any one of claims 1 to 22.

25. The assembly method of the top cover assembly according to claim 24, characterized in that, The housing (1) is provided with mounting holes (11); The pole post (2) has a pole post body (22) and an extension (23) connected along the axial direction. The pressure ring (3) has a pressure ring body (31), a protrusion (32) and a recess (33). The pressure ring body (31) surrounds the outside of the protrusion (32) and the recess (33). The protrusion (32) protrudes from one side surface of the pressure ring body (31), and the recess (33) is recessed into the other side surface of the pressure ring body (31).

26. The assembly method of the top cover assembly according to claim 25, characterized in that, Assembling the housing (1), the pole post (2), the pressure ring (3), and the seal (4) includes the following steps: The pole post (2) is partially inserted into the mounting hole (11), the pole post body (22) is disposed on one side surface of the housing (1), and the extension (23) is inserted into the mounting hole (11). The pressure ring (3) is fitted onto the pole post (2). The protrusion (32) protrudes from the surface of the pressure ring body (31) facing the housing (1), and the protrusion (32) abuts against the side wall of the pole post (2) passing through the mounting hole (11). The recess (33) is recessed into the surface of the pressure ring body (31) away from the housing (1). One end of the pole post (2) passing through the mounting hole (11) forms a receiving space (330) with the recess (33). The sealing element (4) is fitted onto the pole post (2) and the pressure ring (3).

27. The assembly method of the top cover assembly according to claim 26, characterized in that, Riveting the pole post (2) includes the following steps: An axial pressure from bottom to top is applied to the side of the extension (23) away from the pole body (22). Under the pressure, the extension (23) deforms in the direction close to the recess (33). The material of the extension (23) flows radially into the receiving space (330) to form a pole protrusion (230) and a radially recessed annular groove (21). The pole protrusion (230) fills the receiving space (330) and abuts against the recess (33). The protrusion (32) and the recess (33) are received in the annular groove (21). The protrusion (32) abuts against the groove wall (211) and the groove bottom (212) of the annular groove (21). The sealing member (4) is sandwiched between the pole (2) and the housing (1) and between the pressure ring (3) and the housing (1).

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