Cover plate assembly and single battery

The cover plate assembly design with inner and outer electrode snap-fit ​​structure solves the problems of complex structure and low space utilization of existing lithium-ion battery cover plates, and achieves the effects of simplified processing, reduced cost and improved stability.

CN224005990UActive Publication Date: 2026-03-17SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-07
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

Existing lithium-ion battery cover structures are complex, with rivet blocks occupying space, affecting the stability of explosion-proof valves, resulting in high processing costs and reduced space utilization of individual batteries.

Method used

The inner and outer poles are connected by a snap-fit ​​structure, eliminating the need for rivet blocks. The cover plate assembly is designed with one-time stamping and includes a cover plate body, insulating parts, sealing ring, inner poles and outer poles. The connection stability and assembly efficiency are improved by embedding and welding the inner and outer snap-fit ​​parts.

Benefits of technology

The simplified cover plate assembly structure reduces processing costs, improves the stability of the explosion-proof valve and the space utilization of individual batteries, and increases assembly efficiency and mass production yield.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a cover plate assembly and a single battery. The cover plate assembly comprises a cover plate main body, an insulating part, a sealing ring, an inner pole and an outer pole. The insulating part and the outer pole are assembled from the outer side of the cover plate main body, and the sealing ring and the inner pole are assembled from the inner side of the cover plate main body, so that the assembly efficiency and performance of the cover plate assembly can be improved, and the mass production yield of the cover plate assembly is improved. According to the cover plate assembly, the inner clamping part is arranged on the inner pole, the outer clamping part is arranged on the outer pole, and the outer clamping part and the inner clamping part are mutually embedded and welded, so that the connection stability of the inner pole and the outer pole can be improved, the axial occupied space of the cover plate assembly can be reduced, and the space utilization rate of the single battery is improved. The outer pole comprises the outer base and the outer boss protruding out of the side, close to the inner pole, of the outer base, and the outer clamping part is arranged on the outer boss, so that the structural strength of the outer pole can be enhanced, and the matching reliability of the inner pole and the outer pole is improved.
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Description

Technical Field

[0001] This application relates to the field of battery protection technology, specifically to a cover plate assembly and a single battery cell. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The structural components of lithium-ion batteries are also an important part of lithium-ion power batteries. They not only ensure the safety and reliability of lithium-ion batteries, but also take into account the connection between the internal chemical system of lithium-ion batteries and external modules and even the battery pack. Because there are various connection relationships inside the structural components, and the requirements of sealing performance and overcurrent performance must be taken into account, the design of the structural components is particularly important.

[0003] Currently, battery cover structures typically use riveting blocks and terminals to fix the aluminum plate, upper plastic, lower plastic, and sealing ring together to form a cover assembly. This assembly has a complex structure, requiring multiple machining processes, resulting in high costs. Furthermore, traditional riveting methods subject the aluminum plate to instantaneous impact during riveting, severely affecting the stability of the explosion-proof valve; and the presence of riveting blocks significantly occupies axial space, leading to low space utilization of individual battery cells. Utility Model Content

[0004] This application provides a cover plate assembly and a single battery cell, which can solve the problems of complex structure, high processing cost, serious impact on the stability of explosion-proof valve, and reduced space utilization of single battery cells in the cover plate assembly composed of riveting blocks and terminal posts.

[0005] This application provides a cover plate assembly, comprising: a cover plate body, an insulating component, a sealing ring, an inner pole, and an outer pole. The cover plate body has a first pole hole, the insulating component is disposed on one side of the cover plate body, the insulating component has a second pole hole, the sealing ring is disposed on the other side of the cover plate body, the sealing ring has a third pole hole, the inner pole is disposed on the side of the sealing ring away from the cover plate body, and the outer pole is disposed on the side of the insulating component away from the cover plate body. The inner pole has an inner locking portion on the surface facing the outer pole, and the outer pole has an outer locking portion on the surface facing the inner pole. The inner pole extends into the third pole hole, and the outer pole passes through the second pole hole and the first pole hole sequentially and extends into the third pole hole, so that the outer locking portion and the inner locking portion are interlocked and welded together. The outer pole includes an outer base and an outer boss, the outer boss protruding from the side of the outer base near the inner pole, and the outer locking portion is disposed on the outer boss.

[0006] In some embodiments, the width between the sidewall of the outer boss and the sidewall of the outer base is greater than or equal to 0.8 mm.

[0007] In some embodiments, the thickness of the outer base is greater than or equal to 0.9 mm, the thickness of the outer boss is greater than or equal to 2 mm, and the thickness of the outer snap-fit ​​portion is greater than or equal to 1 mm.

[0008] In some embodiments, the cross-sectional area of ​​the outer snap-fit ​​portion on a section parallel to the cover plate body is greater than or equal to 1.5 mm². 2 .

[0009] In some embodiments, the inner snap-fit ​​portion is a snap-fit ​​groove, and the outer snap-fit ​​portion is a snap-fit ​​protrusion.

[0010] In some embodiments, the outer pole post further includes a recessed platform, which is disposed on the surface of the outer base away from the outer protrusion and is correspondingly disposed with respect to the outer snap-fit ​​portion.

[0011] In some embodiments, the projection of the outer snap-fit ​​portion on the cover body is located within the projection of the recessed platform on the cover body.

[0012] In some embodiments, the inner electrode post includes an inner body portion, an inner snap-fit ​​portion is disposed on the surface of the inner body portion near the outer electrode post, and an outer protrusion abuts against the inner body portion.

[0013] In some embodiments, the sealing ring includes a first sealing portion and a second sealing portion, the second sealing portion protruding from the side of the first sealing portion near the outer pole post; the third pole post hole includes a first hole portion and a second hole portion that communicate with each other, the first hole portion penetrating the first sealing portion, the second hole portion penetrating the second sealing portion, the projection of the hole wall of the first hole portion on the cover plate body falling into the projection of the hole wall of the second hole portion on the cover plate body; the first sealing portion abuts against the inner body portion, the first sealing portion located inside the second hole portion abuts against the outer protrusion, the first sealing portion located outside the second hole portion abuts against the cover plate body, the cover plate body and the outer protrusion compress the first sealing portion so that the outer protrusion abuts against the inner body portion.

[0014] This application also provides a single-cell battery, which includes the cover plate assembly of this application.

[0015] The cover plate assembly of this application includes: a cover plate body, an insulating component, a sealing ring, an inner electrode post, and an outer electrode post. The inner electrode post is located on the side of the sealing ring away from the cover plate body, and the outer electrode post is located on the side of the insulating component away from the cover plate body. The insulating component and the outer electrode post are assembled from the outside of the cover plate body, and the sealing ring and the inner electrode post are assembled from the inside of the cover plate body. This can improve the assembly efficiency and performance of the cover plate assembly and increase the mass production yield of the cover plate assembly.

[0016] The inner electrode post of this application has an inner snap-fit ​​part on the side facing the outer electrode post, and an outer snap-fit ​​part on the side facing the inner electrode post. The outer snap-fit ​​part and the inner snap-fit ​​part are interlocked and welded together, which can improve the connection stability of the inner electrode post and the outer electrode post. Compared with the riveting scheme, the riveting block can be omitted, which can reduce the space occupied by the cover plate assembly in the axial direction, thereby improving the space utilization of the single battery cell.

[0017] The outer pole of this application includes an outer base and an outer boss. The outer boss protrudes from the outer base on the side near the inner pole, and the outer snap-fit ​​part is disposed on the outer boss, thereby enhancing the structural strength of the outer pole and improving the reliability of the fit between the inner pole and the outer pole. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of the cover plate assembly provided in the embodiments of this application. Figure 1 ;

[0020] Figure 2 A schematic diagram of the structure of the cover plate assembly provided in the embodiments of this application. Figure 2 ;

[0021] Figure 3 A top view of the cover plate assembly provided in an embodiment of this application;

[0022] Figure 4 for Figure 3 AA section diagram;

[0023] Figure 5 for Figure 3 BB cross-section diagram;

[0024] Figure 6 A schematic diagram of the internal pole structure provided in the embodiments of this application. Figure 1 ;

[0025] Figure 7 A schematic diagram of the internal pole structure provided in the embodiments of this application. Figure 2 ;

[0026] Figure 8 A top view of the inner pole provided in an embodiment of this application;

[0027] Figure 9 for Figure 8 CC section view;

[0028] Figure 10 A schematic diagram of the structure of the external pole provided in the embodiments of this application. Figure 1 ;

[0029] Figure 11 A schematic diagram of the structure of the external pole provided in the embodiments of this application. Figure 2 ;

[0030] Figure 12 A cross-sectional view of the external pole provided in an embodiment of this application;

[0031] Figure 13 A cross-sectional view of the sealing ring before compression provided in an embodiment of this application;

[0032] Figure 14 A cross-sectional view of the cover plate assembly before compression of the sealing ring provided in an embodiment of this application;

[0033] Figure 15 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0034] Figure 16 A DD cross-sectional view of a single cell provided in an embodiment of this application;

[0035] Figure 17 The image shows an EE cross-sectional view of a single cell provided in an embodiment of this application.

[0036] The markings in the diagram are as follows:

[0037] 100. Cover assembly; 200. Housing; 201. Receiving cavity; 300. Battery cell;

[0038] 1. Cover plate body; 2. Insulating component; 3. Sealing ring; 4. Inner pole; 5. Outer pole;

[0039] 11. First terminal hole; 111. First positive terminal hole; 112. First negative terminal hole;

[0040] 21. Second electrode post hole; 211. Second positive electrode post hole; 212. Second negative electrode post hole; 210. First insulating component; 220. Second insulating component;

[0041] 31. Third electrode post hole; 32. First sealing part; 33. Second sealing part; 311. Third positive electrode post hole; 312. Third negative electrode post hole; 313. First hole portion; 314. Second hole portion; 310. First sealing ring; 320. Second sealing ring;

[0042] 41. Inner snap-fit ​​part; 42. Inner base; 43. Inner boss; 44. Welding hole; 411. Positive inner snap-fit ​​part; 412. Negative inner snap-fit ​​part; 410. Positive inner pole; 420. Negative inner pole; 401. Inner main body part;

[0043] 51. External snap-fit ​​part; 52. External base; 53. External protrusion; 54. Recessed platform; 511. Positive external snap-fit ​​part; 512. Negative external snap-fit ​​part; 510. Positive external pole; 520. Negative external pole; 501. External main body. Detailed Implementation

[0044] The preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings, in order to fully introduce the technical content of this utility model to those skilled in the art, and to demonstrate that this utility model can be implemented, making the disclosed technical content of this utility model clearer and enabling those skilled in the art to more easily understand how to implement this utility model. However, this utility model can be embodied in many different forms of embodiments, and the protection scope of this utility model is not limited to the embodiments mentioned herein. The following description of the embodiments is not intended to limit the scope of this utility model.

[0045] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", and "side", are only the directions shown in the accompanying drawings. The directional terms used in this document are for the purpose of explaining and illustrating this utility model, and are not intended to limit the scope of protection of this utility model.

[0046] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. Furthermore, for ease of understanding and description, the dimensions and thicknesses of each component shown in the drawings are arbitrary, and this invention does not limit the dimensions and thicknesses of each component.

[0047] Example 1

[0048] Please see Figures 1-14 This application provides a cover plate assembly 100. The cover plate assembly 100 includes: a cover plate body 1, an insulating component 2, a sealing ring 3, an inner pole post 4, and an outer pole post 5.

[0049] Please see Figure 4 and Figure 5 The cover plate body 1 is provided with a first electrode post hole 11. Specifically, the first electrode post hole includes a first positive electrode post hole 111 and a first negative electrode post hole 112.

[0050] Please see Figure 4 and Figure 5An insulating component 2 is disposed on one side of the cover plate body 1, and a second electrode post hole 21 is provided on the insulating component 2. Specifically, the insulating component 2 includes a first insulating component 210 and a second insulating component 220. The second electrode post hole 21 includes a second positive electrode post hole 211 and a second negative electrode post hole 212. The second positive electrode post hole 211 penetrates the first insulating component 210 along the thickness direction of the cover plate body 1, and the second negative electrode post hole 212 penetrates the second insulating component 220 along the thickness direction of the cover plate body 1. Specifically, the insulating component 2 is disposed on the outer side of the cover plate body 1, that is, on the side of the cover plate body 1 away from the casing of the individual battery.

[0051] Please see Figure 4 and Figure 5 A sealing ring 3 is disposed on the other side of the cover plate body 1, and a third terminal hole 31 is provided on the sealing ring 3. Specifically, the sealing ring 3 includes a first sealing ring 310 and a second sealing ring 320. The third terminal hole 31 includes a third positive terminal hole 311 and a third negative terminal hole 312. The third positive terminal hole 311 penetrates the first sealing ring 310 along the thickness direction of the cover plate body 1, and the third negative terminal hole 312 penetrates the second sealing ring 320 along the thickness direction of the cover plate body 1. Specifically, the sealing ring 3 is disposed on the inner side of the cover plate body 1, that is, on the side of the cover plate body 1 close to the casing of the single battery cell.

[0052] Please see Figure 4 and Figure 5 The inner electrode post 4 is located on the side of the sealing ring 3 away from the cover plate body 1. Specifically, the inner electrode post 4 includes a positive inner electrode post 410 and a negative inner electrode post 420. The inner electrode post 4 can be formed by a one-time stamping process, without secondary processing, resulting in a simple structure and low production cost.

[0053] Please see Figure 4 and Figure 5 The outer electrode post 5 is located on the side of the insulating component 2 away from the cover plate body 1. Specifically, the outer electrode post 5 includes a positive outer electrode post 510 and a negative outer electrode post 520. The outer electrode post 5 can be formed by one-time stamping of copper-aluminum composite material to form a copper-aluminum composite electrode post, which does not require secondary processing, has a simple structure, and low production cost.

[0054] Therefore, this application allows the insulating component 2 and the outer pole 5 to be assembled from the outside of the cover plate body 1, and the sealing ring 3 and the inner pole 4 to be assembled from the inside of the cover plate body 1. Specifically, the first insulating component 210 and the positive outer pole 510 are assembled from the outside of the cover plate body 1, and the first sealing ring 310 and the positive inner pole 410 are assembled from the inside of the cover plate body 1; the second insulating component 220 and the negative outer pole 520 are assembled from the outside of the cover plate body 1, and the second sealing ring 320 and the negative inner pole 420 are assembled from the inside of the cover plate body 1, thereby improving the assembly efficiency and performance of the cover plate assembly 100 and increasing the mass production yield of the cover plate assembly 100.

[0055] Please see Figure 4 and Figure 5 The inner electrode 4 has an inner locking portion 41 on the surface facing the outer electrode 5. Specifically, the inner locking portion 41 includes a positive inner locking portion 411 and a negative inner locking portion 412. The positive inner locking portion 411 is disposed on the surface of the positive inner electrode 410 facing the positive outer electrode 510; the negative inner locking portion 412 is disposed on the surface of the negative inner electrode 420 facing the negative outer electrode 520. The projection shape of the inner locking portion 41 on the cover plate body 1 includes a circle, a square, and a rounded rectangle. In this embodiment, the projection shape of the locking portion 41 on the cover plate body 1 is a circle.

[0056] Please see Figure 4 and Figure 5 The outer electrode 5 has an outer locking portion 51 on the surface facing the inner electrode 4. Specifically, the outer locking portion 51 includes a positive outer locking portion 511 and a negative outer locking portion 512. The positive outer locking portion 511 is disposed on the surface of the positive outer electrode 510 facing the positive inner electrode 410; the negative outer locking portion 512 is disposed on the surface of the negative outer electrode 520 facing the negative inner electrode 420. The projection shape of the outer locking portion 51 on the cover plate body 1 includes a circle, a square, and a rounded rectangle. In this embodiment, the projection shape of the outer locking portion 51 on the cover plate body 1 is a circle.

[0057] Please see Figure 4 and Figure 5 In this embodiment, the inner snap-fit ​​portion 41 is a snap-fit ​​groove, and the outer snap-fit ​​portion 51 is a snap-fit ​​protrusion. That is, both the positive inner snap-fit ​​portion 411 and the negative inner snap-fit ​​portion 412 are snap-fit ​​grooves, and both the positive outer snap-fit ​​portion 511 and the negative outer snap-fit ​​portion 512 are snap-fit ​​protrusions. In other embodiments, the inner snap-fit ​​portion 41 may be a snap-fit ​​protrusion, and the outer snap-fit ​​portion 51 may be a snap-fit ​​groove. That is, both the positive inner snap-fit ​​portion 411 and the negative inner snap-fit ​​portion 412 are snap-fit ​​protrusions, and both the positive outer snap-fit ​​portion 511 and the negative outer snap-fit ​​portion 512 are snap-fit ​​grooves.

[0058] Please see Figure 4 and Figure 5The inner pole 4 extends into the third pole hole 31, and the outer pole 5 passes through the second pole hole 21 and the first pole hole 11 in sequence and extends into the third pole hole 31, so that the outer snap-fit ​​part 51 and the inner snap-fit ​​part 41 are interlocked and welded together. Specifically, the positive inner electrode post 410 extends into the third positive electrode post hole 311, and the positive outer electrode post 510 passes through the second positive electrode post hole 211 and the first positive electrode post hole 111 in sequence and extends into the third positive electrode post hole 311, so that the positive outer snap-fit ​​part 511 and the positive inner snap-fit ​​part 411 are interlocked and welded together; the negative inner electrode post 420 extends into the third negative electrode post hole 312, and the negative outer electrode post 520 passes through the second negative electrode post hole 212 and the first negative electrode post hole 112 in sequence and extends into the third negative electrode post hole 312, so that the negative outer snap-fit ​​part 512 and the negative inner snap-fit ​​part 412 are interlocked and welded together. This can improve the connection stability of the inner electrode post 4 and the outer electrode post 5. Compared with the riveting scheme, the riveting block can be omitted, and the axial space occupied by the cover plate assembly 100 can be reduced. Specifically, the size of the cover plate assembly 100 in the thickness direction of the cover plate body 1 is reduced, thereby improving the space utilization rate of the single battery.

[0059] Please see Figure 6 , Figure 7 , Figure 8 and Figure 9 The inner pole 4 includes an inner body portion 401. An inner snap-fit ​​portion 41 is disposed on the surface of the inner body portion 401 near the outer pole 5. Specifically, the inner body portion 401 includes an inner base 42 and an inner boss 43. The inner boss 43 protrudes from the inner base 42 near the outer pole 5, and the projection of the outer wall of the inner boss 43 onto the cover plate body 1 lies within the projection of the inner base 42 onto the cover plate body 1. The inner snap-fit ​​portion 41 is disposed on the surface of the inner boss 43 away from the inner base 42. In other words, in a cross-section perpendicular to the cover plate body 1, the width of the inner boss 43 is less than or equal to the width of the inner base 42. In this embodiment, the width of the inner boss 43 is less than the width of the inner base 42. This enhances the structural strength of the inner pole 4 and improves the reliability of the fit between the inner pole 4 and the outer pole 5.

[0060] The projections of the inner base 42 and the inner boss 43 onto the cover plate body 1 can be circular, square, rounded rectangle, etc. In this embodiment, the projection of the inner base 42 onto the cover plate body 1 is a rounded rectangle, and the projection of the inner boss 43 onto the cover plate body 1 is a rounded rectangle.

[0061] Please see Figure 4 , Figure 5 , Figure 7 and Figure 9The inner electrode post 4 includes a welding hole 44. The welding hole 44 is located on the surface of the inner electrode post 4 away from the outer electrode post 5 and communicates with the inner locking part 41. Specifically, the welding hole 44 is located on the surface of the inner base 42 away from the inner boss 43. This allows welding of the outer locking part 51 and the inner locking part 41 through the welding hole 44, improving the reliability of the electrical connection between the outer locking part 51 and the inner locking part 41.

[0062] Please see Figure 9 The projection of the sidewall of the inner snap-fit ​​portion 41 onto the cover plate body 1 lies within the projection of the hole wall of the welding hole 44 onto the cover plate body 1. In other words, in a cross-section perpendicular to the cover plate body 1, the width of the inner snap-fit ​​portion 41 is less than or equal to the width of the welding hole 44. In this embodiment, the width of the inner snap-fit ​​portion 41 is less than the width of the welding hole 44, thereby facilitating the welding equipment to extend into the welding hole 44 to weld the outer snap-fit ​​portion 51 and the inner snap-fit ​​portion 41.

[0063] Please see Figure 4 , Figure 5 , Figure 10 , Figure 11 and Figure 12 The outer pole post 5 includes an outer body portion 501. An outer snap-fit ​​portion 51 is disposed on the surface of the outer body portion 501 near the inner pole post 4, and the outer body portion 501 abuts against the inner boss 43. Specifically, the outer body portion 501 includes an outer base 52 and an outer boss 53. The outer boss 53 protrudes from the outer base 52 near the inner pole post 4, and the projection of the outer wall of the outer boss 53 onto the cover plate body 1 lies within the projection of the outer base 52 onto the cover plate body 1. The outer snap-fit ​​portion 51 is disposed on the surface of the outer boss 53 away from the outer base 52. In other words, in a cross-section perpendicular to the cover plate body 1, the width of the outer boss 53 is less than or equal to the width of the outer base 52. In this embodiment, the width of the outer boss 53 is less than the width of the outer base 52. Specifically, the outer boss 53 abuts against the inner boss 43 of the inner body portion 401. This can enhance the structural strength of the outer pole post 5 and improve the reliability of the fit between the inner pole post 4 and the outer pole post 5.

[0064] The projections of the outer base 52 and the outer protrusion 53 onto the cover plate body 1 can be circular, square, or rounded rectangle. In this embodiment, the projection of the outer base 52 onto the cover plate body 1 is circular, and the projection of the outer protrusion 53 onto the cover plate body 1 is rounded rectangle.

[0065] Please see Figure 11 The rectangular side length W2 of the outer protrusion 53 is greater than or equal to 5mm. In this embodiment, W2 = 5.5mm, which allows the outer protrusion 53 to cooperate with the first pole hole 11 of the cover plate body 1, preventing the outer pole 5 from rotating within the first pole hole 11.

[0066] Please see Figure 12 The width W1 between the sidewall of the outer boss 53 and the sidewall of the outer base 52 is greater than or equal to 0.8 mm. In this embodiment, W1 = 1 mm, which can improve the strength of the outer pole post 5 and the stability after the outer pole post 5 and the inner pole post 4 are welded together.

[0067] Please see Figure 12 The thickness T1 of the outer base 52 is greater than or equal to 0.9 mm, the thickness T2 of the outer boss 53 is greater than or equal to 2 mm, and the thickness T3 of the outer snap-fit ​​portion 51 is greater than or equal to 1 mm. In this embodiment, T1 = 1 mm, which ensures the strength of the outer base 52 and improves the stability after welding the outer electrode 5 and the inner electrode 4. In this embodiment, T2 = 2.5 mm, which improves the strength of the outer boss 53 and the welding strength between the outer electrode 5 and the inner electrode 4. In this embodiment, T3 = 1.1 mm, which ensures the welding strength and current carrying capacity of the outer electrode 5 and the inner electrode 4.

[0068] Please see Figure 12 The cross-sectional area of ​​the outer snap-fit ​​part 51 on the section parallel to the cover plate body 1 is greater than or equal to 1.5 mm². 2 In this embodiment, the cross-sectional area of ​​the outer snap-fit ​​portion 51 on the section parallel to the cover plate body 1 is equal to 12.56 mm². 2 This can improve the strength of the outer connector 51, and also ensure the welding strength and current carrying capacity of the outer pole 5 and the inner pole 4.

[0069] Please see Figure 10 and Figure 12 The outer pole post 5 also includes a recessed platform 54. The recessed platform 54 is disposed on the surface of the outer base 52 away from the outer protrusion 53 and is correspondingly disposed with respect to the outer snap-fit ​​portion 51. Specifically, the projection of the outer snap-fit ​​portion 51 on the cover plate body 1 is located within the projection of the recessed platform 54 on the cover plate body 1. In other words, in a cross section perpendicular to the cover plate body 1, the width of the outer snap-fit ​​portion 51 is less than or equal to the width of the recessed platform 54. In this embodiment, the width of the outer snap-fit ​​portion 51 is less than the width of the recessed platform 54. Therefore, by providing the recessed platform 54 on the outer base 52, it is convenient to form the outer snap-fit ​​portion 51 on the outer protrusion 53.

[0070] Please see Figure 13 The sealing ring 3 includes a first sealing portion 32 and a second sealing portion 33. The second sealing portion 33 protrudes from the side of the first sealing portion 32 near the outer pole post 5, and the projection of the sidewall of the second sealing portion 33 onto the cover plate body 1 falls within the projection of the sidewall of the first sealing portion 32 onto the cover plate body 1. In other words, in a cross-section perpendicular to the cover plate body 1, the width of the second sealing portion 33 is less than or equal to the width of the first sealing portion 32. In this embodiment, the width of the second sealing portion 33 is less than the width of the first sealing portion 32.

[0071] Please see Figure 13 The third pole post hole 31 includes a first hole portion 313 and a second hole portion 314 that are connected. The first hole portion 313 penetrates the first sealing portion 32, and the second hole portion 314 penetrates the second sealing portion 33. The projection of the hole wall of the first hole portion 313 on the cover plate body 1 falls within the projection of the hole wall of the second hole portion 314 on the cover plate body 1. In other words, in a cross section perpendicular to the cover plate body 1, the width of the first hole portion 313 is less than or equal to the width of the second hole portion 314. In this embodiment, the width of the first hole portion 313 is less than the width of the second hole portion 314.

[0072] Please see Figure 4 , Figure 5 , Figure 13 and Figure 14 ,in, Figure 4 and Figure 5 This is a cross-sectional view of the cover plate assembly after the sealing ring has been compressed. Figure 13 This is a cross-sectional view of the sealing ring before compression. Figure 14 A cross-sectional view of the cover plate assembly before compression of the sealing ring. The first sealing part 32 abuts against the inner base 42 of the inner main body 401. The first sealing part 32 located inside the second hole 314 abuts against the outer boss 53 of the outer main body 501. The first sealing part 32 located outside the second hole 314 abuts against the cover plate body 1. The cover plate body 1 and the outer boss 53 of the outer main body 501 compress the first sealing part 32 so that the outer boss 53 of the outer main body 501 abuts against the inner boss 43 of the inner main body 401. It is worth noting that before compression of the first sealing part 32, the distance L3 between the hole wall of the first hole 313 and the side wall of the inner boss 43 is greater than or equal to 0.2 mm. In this embodiment,

[0073] L3 = 0.3mm, which can prevent the sealing ring 3 from breaking when the first sealing part 32 of the sealing ring 3 is compressed by the cover plate body 1 and the outer body part 501.

[0074] Please see Figure 15 , Figure 16 and Figure 17 This application also provides a single-cell battery, which includes the cover assembly 100 of this application. The single-cell battery further includes: a housing 200 and a cell 300. Specifically, the housing 200 has a receiving cavity 201, and the cell 300 is disposed within the receiving cavity 201. The cover assembly 100 is disposed at the end of the housing 200, and the inner terminal 4 of the cover assembly 100 is electrically connected to the cell 300.

[0075] The above provides a detailed description of a cover plate assembly and a single battery provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cover plate assembly, characterized by The cover plate assembly comprises a cover plate body, an insulating piece, a sealing ring, an inner pole post and an outer pole post, the cover plate body is provided with a first pole post hole, the insulating piece is arranged on one side of the cover plate body, the insulating piece is provided with a second pole post hole, the sealing ring is arranged on the other side of the cover plate body, the sealing ring is provided with a third pole post hole, the inner pole post is arranged on the side of the sealing ring away from the cover plate body, and the outer pole post is arranged on the side of the insulating piece away from the cover plate body. The surface of the side of the inner pole post facing the outer pole post is provided with an inner clamping part, the surface of the side of the outer pole post facing the inner pole post is provided with an outer clamping part, the inner pole post extends into the third pole post hole, the outer pole post sequentially passes through the second pole post hole and the first pole post hole and extends into the third pole post hole, so that the outer clamping part and the inner clamping part are embedded and welded with each other. The outer pole post comprises an outer base and an outer boss, the outer boss protrudes from the side of the outer base close to the inner pole post, and the outer clamping part is arranged on the outer boss. The width between the side wall of the outer boss and the side wall of the outer base is greater than or equal to 0.8 mm.

2. The cover plate assembly of claim 1, wherein, The thickness of the outer base is greater than or equal to 0.9 mm, the thickness of the outer boss is greater than or equal to 2 mm, and the thickness of the outer clamping part is greater than or equal to 1 mm.

3. The cover plate assembly of claim 1, wherein, The inner clamping part is a clamping groove, and the outer clamping part is a clamping protrusion.

4. The cover plate assembly of claim 1, wherein, The outer joint portion has a cross-sectional area in a cross section parallel to the lid plate body that is greater than or equal to 1.5 mm 2 .

5. The cover plate assembly of claim 1, wherein, The outer pole post further comprises a sunken platform, which is arranged on the surface of the side of the outer base away from the outer boss and corresponds to the outer clamping part.

6. The cover plate assembly of claim 5, wherein, The projection of the outer clamping part on the cover plate body is located in the projection of the sunken platform on the cover plate body.

7. The cover plate assembly of claim 6, wherein, The inner pole post comprises an inner main part, the inner clamping part is arranged on the surface of the side of the inner main part close to the outer pole post, and the outer boss abuts against the inner main part.

8. The cover plate assembly of claim 1, wherein, The sealing ring comprises a first sealing part and a second sealing part, the second sealing part protrudes from the side of the first sealing part close to the outer pole post; 9. The cover plate assembly of claim 8, wherein, The third pole post hole comprises a first hole part and a second hole part in communication, the first hole part penetrates through the first sealing part, the second hole part penetrates through the second sealing part, and the projection of the hole wall of the first hole part on the cover plate body falls into the projection of the hole wall of the second hole part on the cover plate body; The first sealing part abuts against the inner main part, the first sealing part located in the second hole part abuts against the outer boss, the first sealing part located outside the second hole part abuts against the cover plate body, and the cover plate body and the outer boss compress the first sealing part so that the outer boss abuts against the inner main part. The cover plate assembly comprises any one of claims 1-9.

10. A single cell characterized by, ​