Cover plate assembly, battery monomer and battery

Abstract

The utility model provides a cover plate assembly, a battery cell and a battery, and relates to the technical field of batteries. The cover plate assembly comprises a cover plate, a pole and a current collecting piece; the pole comprises a pole body, a terminal part and a riveting part, the terminal part and the riveting part are respectively positioned on two sides of the cover plate, the pole body is arranged on the cover plate in a penetrating manner, one end of the peripheral surface of the pole body protrudes outwards in the radial direction to form the terminal part, and the other end of the peripheral surface of the pole body protrudes outwards in the radial direction to form the riveting part; the current collector is connected with one end, far away from the terminal part, of the pole; a riveting hole is formed in the end face, away from the terminal part, of the column body. The terminal part and the post body are integrally formed, and the riveting part and the riveting hole are arranged on the post body, so that the post can be fixed on the cover plate through pressing rivet, and welding is not needed. Thus, the manufacturing efficiency of the cover plate assembly can be improved, the production cost of the cover plate assembly can be reduced, the matching precision of the pole column and the punch during pressing rivet can be improved through the pressing rivet hole, and therefore the accuracy of the punching position can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a cover plate assembly, a battery monomer and a battery. BACKGROUND

[0002] The battery monomer comprises a shell, a cover plate assembly covering the shell, and an electrode assembly arranged in the shell. The cover plate assembly comprises a cover plate and an electrode output arranged on the cover plate. The electrode output comprises a pole column penetrating the cover plate and a terminal sleeved with one end of the pole column to prevent the pole column from falling into the shell.

[0003] When the cover plate assembly is assembled, the terminal needs to be welded with the pole column to avoid the pole column from falling into the battery monomer. This not only leads to low production efficiency of the cover plate assembly, but also increases the production cost of the product. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the present application provide a cover plate assembly, a battery monomer and a battery, which can improve the production efficiency of the cover plate assembly.

[0005] In a first aspect, embodiments of the present application provide a cover plate assembly, which comprises a cover plate, a pole column and a current collector. The pole column comprises a column body, a terminal portion and a riveting portion. The terminal portion and the riveting portion are respectively located on two sides of the cover plate. The column body penetrates the cover plate. One end of the outer circumferential surface of the column body is radially outwardly protruded to form the terminal portion. The other end of the outer circumferential surface of the column body is radially outwardly protruded to form the riveting portion. The current collector is connected with one end of the pole column away from the terminal portion. The end surface of the column body away from the terminal portion is provided with a riveting hole.

[0006] In an embodiment, along the radial direction of the pole column, the distance between the outer circumferential surface of the riveting portion and the outer circumferential surface of the column body is L1, which satisfies: 3.5mm≤L1≤4.5mm.

[0007] In an embodiment, along the direction away from the terminal portion, the hole diameter of the riveting hole gradually increases.

[0008] In an embodiment, before the outer circumferential surface of the pole column is outwardly protruded to form the riveting portion, the wall thickness of the riveting hole is t, which satisfies: 4mm≤t≤6mm.

[0009] In an embodiment, before the outer circumferential surface of the pole column is outwardly protruded to form the riveting portion, the depth size of the riveting hole is d, which satisfies: 1mm≤d≤5mm.

[0010] In an embodiment, the current collector is sleeved on the column body, and one end of the current collector close to the column body is located between the riveting portion and the cover plate.

[0011] In an embodiment, the cover plate assembly further comprises a sealing ring, the sealing ring is sleeved on the column body and located between the column body and the cover plate; wherein a boss is arranged on the side of the terminal part facing the cover plate, and the boss abuts against the sealing ring.

[0012] In an embodiment, the cover plate assembly further comprises an upper plastic part, the upper plastic part is arranged between the terminal part and the cover plate, and the upper plastic part is inserted with the terminal part.

[0013] In an embodiment, a first hole is arranged on the side of the terminal part close to the cover plate, and a limiting block is arranged on the side of the upper plastic part close to the terminal part, the limiting block is inserted with the first hole.

[0014] In an embodiment, the upper plastic part is partially embedded in the cover plate.

[0015] In an embodiment, the outer circumferential surface of the upper plastic part is radially outwardly protruded on the side close to the cover plate to form an extension part, and the extension part is embedded in the cover plate.

[0016] In an embodiment, the cover plate assembly further comprises a lower plastic part, the lower plastic part is arranged between the current collecting part and the cover plate.

[0017] In a second aspect, the embodiments of the present application provide a battery monomer, the battery monomer comprising a shell, an electrode assembly and the aforementioned cover plate assembly; the shell has a containing cavity; the electrode assembly is arranged in the containing cavity; the cover plate is combined with the shell to close the containing cavity, and the current collecting part is connected with the electrode assembly.

[0018] In a third aspect, the embodiments of the present application provide a battery, the battery comprising a battery box and the aforementioned battery monomer; the battery box has a mounting cavity; there are multiple battery monomers, and the multiple battery monomers are connected in series and / or in parallel.

[0019] The beneficial effects of the embodiments of the present application are as follows:

[0020] In the embodiments of the present application, the terminal part is integrally formed with the column body, and the riveting part and the riveting hole are arranged on the column body, so that the pole column can be fixed on the cover plate by riveting without welding. In this way, not only the manufacturing efficiency of the cover plate assembly can be improved and the production cost thereof can be reduced, but also the cooperation accuracy of the riveting hole and the punch can be improved, so that the accuracy of the stamping position can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0022] Figure 1is an exploded view of the cover plate assembly provided by an embodiment of the present application;

[0023] Figure 2 is a structural schematic view of the cover plate assembly provided by an embodiment of the present application;

[0024] Figure 3 is a structural schematic view of the pole provided by an embodiment of the present application;

[0025] Figure 4 is a structural schematic view of the pole in a longitudinal section provided by an embodiment of the present application;

[0026] Figure 5 is a structural schematic view of the pole before riveting provided by an embodiment of the present application;

[0027] Figure 6 is Figure 2 is an enlarged view of A in FIG. 1;

[0028] Figure 7 is a structural schematic view of the upper plastic part provided by an embodiment of the present application;

[0029] Figure 8 is a structural schematic view of the upper plastic part from another perspective provided by an embodiment of the present application;

[0030] Figure 9 is an exploded view of the battery monomer provided by an embodiment of the present application;

[0031] Figure 10 is a structural schematic view of the battery provided by an embodiment of the present application.

[0032] BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 1 - cover plate assembly; 11 - cover plate; 12 - pole; 121 - column; 122 - terminal portion; 123 - riveting portion; 124 - riveting hole; 125 - boss; 126 - first hole;

[0034] 13 - current collector; 14 - sealing ring; 15 - upper plastic part; 151 - limiting block; 152 - extension; 16 - lower plastic part;

[0035] 2 - battery monomer; 21 - shell; 211 - accommodating cavity; 22 - electrode assembly; 23 - positive electrode connecting sheet; 24 - bottom supporting sheet;

[0036] 3 - battery; 31 - battery box; 311 - mounting cavity. DETAILED DESCRIPTION

[0037] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0038] In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected, or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The term "comprising" or "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that the product including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such product.

[0040] In the description of the embodiments of the present application, the words "example" or "for example" are used to mean example, illustration or description. Any embodiment or design scheme described as "example" or "for example" in the embodiments of the present application is not interpreted as more preferred or having more advantages than another embodiment or design scheme. The words "example" or "for example" are intended to present the relative concept in a clear manner.

[0041] Please refer to Fig. 1 Figure 3 , Figure 1 is an exploded view of the cover plate assembly 1 provided by the embodiments of the present application, Figure 2 is a structural schematic view of the cover plate assembly 1 provided by the embodiments of the present application, Figure 3is a structural schematic diagram of the pole post 12 provided by the embodiments of the present application, and the embodiments of the present application provide a cover plate assembly 1. The cover plate assembly 1 comprises a cover plate 11, a pole post 12 and a current collector 13. The pole post 12 comprises a post body 121, a terminal portion 122 and a riveting portion 123. The terminal portion 122 and the riveting portion 123 are respectively located on two sides of the cover plate 11. The post body 121 is arranged on the cover plate 11. One end of the outer circumferential surface of the post body 121 is radially outwardly protruded to form the terminal portion 122. The other end of the outer circumferential surface of the post body 121 is radially outwardly protruded to form the riveting portion 123. The current collector 13 is connected to one end of the pole post 12 away from the terminal portion 122. The riveting hole 124 is arranged on the end surface of the post body 121 away from the terminal.

[0042] It should be understood that the current collector 13 can be connected to the post body 121, or can be connected to the riveting portion 123, or can be connected to both the riveting portion 123 and the post body 121.

[0043] It should be understood that the cover plate assembly 1 further comprises an upper plastic part 15, a sealing ring 14 and a lower plastic part 16. During assembly, the upper plastic part 15, the cover plate 11, the sealing ring 14 and the lower plastic part 16 are sequentially arranged on the post body 121. Then, axial pressure is applied to the end of the post body 121 away from the terminal portion 122 by the punch of the stamping equipment, and part of the punch is inserted into the riveting hole 124. With the pressure output of the stamping equipment, the end of the outer circumferential surface of the post body 121 away from the terminal portion 122 is radially outwardly protruded to form the riveting portion 123. In this way, not only the pole post 12 is fixed on the end cover through the riveting portion 123 and the terminal portion 122, but also the above-mentioned other components can be fixed to avoid falling off from the pole post 12; and the cover plate assembly 1 can be installed in a top-down manner to assemble each component to the pole post 12, which is simple and easy to implement, and can simplify the assembly of the cover plate assembly 1.

[0044] It should be understood that the current collector 13 can be arranged on the post body 121 before stamping, so that it is limited by the riveting portion 123 after stamping; or the current collector 13 can be welded to the pole post 12 after the stamping is completed.

[0045] Specifically, the pole post 12 is formed by cold heading to integrate the terminal portion 122 with the post body 121.

[0046] In the embodiment, the terminal portion 122 is integrally formed with the post body 121, and the riveting portion 123 and the riveting hole 124 are arranged on the post body 121, so that the pole post 12 can be fixed on the cover plate 11 by riveting without welding. In this way, not only the manufacturing efficiency of the cover plate assembly 1 can be improved and the production cost thereof can be reduced, but also the cooperation accuracy of the riveting hole and the punch can be improved, so that the accuracy of the stamping position can be effectively improved.

[0047] In addition, by integrally forming the terminal portion 122 with the column body 121, the number of components of the cover plate assembly 1 can be reduced, and problems such as virtual welding that can occur in welding can be avoided, so that stable current transmission can be ensured, and the overall performance stability of the battery monomer 2 can be enhanced.

[0048] Referring to Figure 4 , Figure 4 is a structure schematic diagram of the longitudinal section of the pole column 12 provided by the embodiment of the present application. In an embodiment, the distance between the outer circumferential surface of the riveting portion 123 and the outer circumferential surface of the column body 121 along the radial direction of the pole column 12 is L1, which satisfies: 3.5mm≤L1≤4.5mm.

[0049] It can be understood that the distance L1 between the outer circumferential surface of the riveting portion 123 and the outer circumferential surface of the column body 121 includes but is not limited to 3.5mm, 3.55mm, 3.6mm, 3.6mm, 3.7mm, 3.8mm, 3.85mm, 3.9mm, 4mm, 4.1mm, 4.15mm, 4.2mm, 4.35mm, 4.3mm, 4.4mm, 4.45mm, 4.5mm.

[0050] In the embodiment, by limiting the distance L1 between the outer circumferential surface of the riveting portion 123 and the outer circumferential surface of the column body 121, on the one hand, the riveting portion 123 can have sufficient area for stop cooperation with the cover plate 11 to prevent the pole column 12 from being pulled out of the cover plate 11, so that the position stability of the pole column 12 can be improved; on the other hand, the size can be prevented from being too large to cause high forming difficulty and high material cost, so that the economy of the cover plate assembly 1 can be improved.

[0051] Referring to Figure 4 In an embodiment, the hole diameter of the riveting hole 124 gradually increases in the direction away from the terminal portion 122. It can be understood that the riveting hole 124 is a tapered hole. In this way, the guiding property of the riveting hole 124 to the punch can be improved, so that the radial deformation of the pole column 12 can be uniform, and the stability of the cooperation between the pole column 12 and the cover plate 11 can be improved.

[0052] Referring to Figure 5 , Figure 5 is a structure schematic diagram of the pole column 12 before riveting provided by the embodiment of the present application. In an embodiment, before the outer circumferential surface of the pole column 12 is outwardly convex to form the riveting portion 123, the wall thickness of the riveting hole 124 is t, which satisfies: 4mm≤t≤6mm.

[0053] It can be understood that the wall thickness t of the riveting hole 124 refers to the wall thickness of the hole wall of the riveting hole 124 at any position. For example, when the riveting hole 124 is a tapered hole, the thickness t of the hole wall at any position is within the range.

[0054] The wall thickness t of the riveting hole 124 includes, but is not limited to, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, or 6 mm.

[0055] In the embodiment, by limiting the wall thickness t of the riveting hole 124, on the one hand, it can be ensured that the thickness around the riveting hole 124 is sufficient to form a riveting portion when riveting, without causing the column body 121 to break, and on the other hand, it can avoid unnecessary material waste caused by too large thickness, so as to control the related manufacturing cost.

[0056] Referring to Figure 5 In an embodiment, before the outer circumferential surface of the pole column 12 is outwardly protruded to form the riveting portion 123, the depth dimension d of the riveting hole 124 satisfies: 1 mm≤d≤5 mm.

[0057] It can be understood that the depth dimension d of the riveting hole 124 includes, but is not limited to, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.2 mm, 2.5 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.3 mm, 3.6 mm, 3.7 mm, 4 mm, 4.2 mm, 4.5 mm, 4.6 mm, 4.8 mm, 4.9 mm, or 5 mm.

[0058] In the embodiment, by limiting the depth dimension d of the riveting hole 124, the stability of riveting can be ensured, and the structure of the pole column 12 will not be damaged. In this way, the stability of the cooperation between the pole column 12 and the cover plate 11 can be ensured, and the stability of the structure of the pole column 12 itself can be ensured.

[0059] Referring to Figure 2 In an embodiment, the current collector 13 is sleeved on the column body 121. An end of the current collector 13 close to the column body 121 is located between the riveting portion 123 and the cover plate 11. In this way, the current collector 13 can be connected with the pole column 12 when the pole column 12 is riveted, without the need of welding the current collector 13 with the pole column 12, so as to improve the assembly efficiency of the cover plate assembly 1.

[0060] The current collector 13 is formed by bending a metal piece once. In this way, the current collector 13 is in a U-shaped structure. In this way, the forming efficiency of the current collector 13 can be improved.

[0061] Referring to Figure 3 and Figure 6 , Figure 6 is Figure 2An enlarged view of the portion A. In an embodiment, the cover plate assembly 1 further comprises a sealing ring 14. The sealing ring 14 is sleeved on the post 121 and located between the post 121 and the cover plate 11. As shown in Figure 3 , the boss 125 is in abutment with the sealing ring 14, as shown in Figure 6 . In this way, the axial compression of the sealing ring 14 can be increased by the abutment of the boss 125 with the sealing ring 14, so as to increase the axial compression force of the sealing ring 14, thereby increasing the radial abutting force of the sealing ring 14, so as to improve the sealing performance of the joint between the cover plate 11 and the post 12.

[0062] Exemplarily, the boss 125 extends in a ring shape around the axis of the post 12.

[0063] Please refer to Figure 2 and Figure 7 , Figure 7 is a structural schematic view of the upper plastic part 15 provided by the embodiment of the present application. In an embodiment, the cover plate assembly 1 further comprises an upper plastic part 15. The upper plastic part 15 is arranged between the terminal portion 122 and the cover plate 11, and the upper plastic part 15 is inserted with the terminal portion 122.

[0064] Specifically, the side of the terminal portion 122 close to the cover plate 11 is provided with a first hole 126. The side of the upper plastic part 15 close to the terminal portion 122 is provided with a limiting block 151, and the limiting block 151 is inserted with the first hole 126.

[0065] Exemplarily, the first hole 126 and the limiting block 151 are both two, and the two first holes 126 are matched with the two limiting blocks 151 respectively. Alternatively, the first holes 126 are distributed in a central symmetry along the axis of the post 12.

[0066] In the embodiment, by inserting the upper plastic part 15 with the terminal portion 122, not only the matching structure between the upper plastic part 15 and the post 12 can be increased, so as to improve the positioning accuracy therebetween, but also the torsion of the post 12 can be limited, so as to effectively avoid the rotation of the post 12 relative to the cover plate 11.

[0067] In addition, at most the inner side of the upper plastic part 15 is arranged opposite to the boss 125 along the axial direction of the post 12. In this way, under the premise that the height dimension of the post 12 is constant, the boss 125 can not only abut against the sealing ring 14, but also the setting of the boss 125 can not affect the thickness of the main body of the upper plastic part 15, so as to ensure the strength of the upper plastic part 15 and the stable and reliable insulation isolation between the post 12 and the cover plate 11.

[0068] Please refer to Figure 6In an embodiment, the upper plastic part 15 is partially embedded in the cover plate 11. In this way, the fitting structure between the upper plastic part 15 and the cover plate 11 can be increased to improve the positioning accuracy therebetween.

[0069] Referring to Figure 8 , Figure 8 is another perspective view of the upper plastic part 15 according to an embodiment of the present application. In an embodiment, the outer circumferential surface of the upper plastic part 15 is radially outwardly protruded near the side of the cover plate 11 to form an extension 152. The extension 152 is embedded in the cover plate 11. In this way, not only the fitting structure between the upper plastic part 15 and the cover plate 11 can be increased to improve the positioning accuracy therebetween, but also the rotation of the upper plastic part 15 can be limited by the structure, so that the rotation of the pole 12 relative to the cover plate 11 can be effectively avoided.

[0070] For example, the extension 152 has four and is distributed in a central symmetry along the axis of the pole 12.

[0071] Referring to Figure 1 or Figure 2 In an embodiment, the cover plate assembly 1 further comprises a lower plastic part 16, which is arranged between the current collector 13 and the cover plate 11. It can be understood that the lower plastic part 16 is used to insulate and isolate the current collector 13 from the cover plate 11, so as to ensure the reliability of the current transmission inside the battery cell 2.

[0072] Referring to Figure 9 , Figure 9 is an exploded view of the battery cell 2 according to an embodiment of the present application. Accordingly, an embodiment of the present application provides a battery cell 2. The battery cell 2 comprises a shell 21, an electrode assembly 22 and the aforementioned cover plate assembly 1. The shell 21 has a receiving cavity 211. The electrode assembly 22 is arranged in the receiving cavity 211. The cover plate 11 is covered with the shell 21 to close the receiving cavity 211. The current collector 13 is connected with the electrode assembly 22.

[0073] The electrode assembly 22 comprises a positive electrode sheet, a separator and a negative electrode sheet which are sequentially stacked and arranged in a roll shape. The current collector 13 can be connected with the positive electrode sheet or the negative electrode sheet. Specifically, the current collector 13 is connected with the negative electrode sheet, and the positive electrode sheet is connected with the shell 21 through a positive electrode connecting sheet 23. In this way, the pole 12 of the battery cell 2 is a negative pole 12, and the shell 21 is positively charged.

[0074] In addition, the shell 21 is an aluminum shell, the cover plate 11 is an aluminum plate, and the pole 12 is an aluminum pole.

[0075] In the embodiment, by using the cover plate assembly 1, the manufacturing efficiency of the battery monomer 2 can be improved, the production cost can be reduced, the cooperation accuracy of the rivet hole and the punch can be improved, the accuracy of the stamping position can be effectively improved, and the structural reliability of the battery monomer 2 can be improved.

[0076] It can be understood that, in order to improve the reliability of the electrical connection between the positive electrode connecting piece 23 and the bottom wall of the shell 21, the middle part of the positive electrode connecting piece 23 is protruded to the bottom wall of the shell 21. In this way, a gap is formed between the periphery of the connecting piece and the bottom wall of the shell 21. Therefore, the bottom supporting piece 24 is arranged between the bottom wall of the shell 21 and the electrode assembly 22. The bottom supporting piece 24 is arranged around the protruding part of the positive electrode connecting piece 23. In this way, the support of the shell 21 to the electrode assembly 22 can be improved. In addition, the positive electrode output of the battery monomer 2 is only output from the middle part of the bottom wall of the shell 21, so that the certainty of the positive electrode output position can be improved, and the interference of the environment on the current output direction can be reduced.

[0077] Optionally, the bottom supporting piece 24 is a plastic piece, for example, a PP or PC plastic.

[0078] Please refer to Figure 10 , Figure 10 is a structural schematic diagram of a battery 3 provided by the embodiment of the present application. Accordingly, the embodiment of the present application provides a battery 3. The battery 3 includes a battery 3 box and the aforementioned battery monomer 2. The battery 3 box has a mounting cavity 311. The battery monomer 2 is multiple, and the multiple battery monomers 2 are connected in series and / or in parallel.

[0079] It can be understood that the multiple battery monomers 2 can be connected in series, can be connected in parallel, or can be connected in series for a part of the battery monomers 2 and connected in parallel for another part of the battery monomers 2.

[0080] In the embodiment, by using the aforementioned battery monomer 2, the manufacturing efficiency of the battery 3 can be improved, the production cost can be reduced, the cooperation accuracy of the rivet hole and the punch can be improved, the accuracy of the stamping position can be effectively improved, and the reliability of the battery 3 can be improved.

[0081] The embodiments of the present application are described in detail above, and specific examples are applied in this paper to describe the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed; in summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A cover plate assembly, characterized in that: include: cover; A pole, comprising a column, a terminal portion, and a rivet portion, wherein the terminal portion and the rivet portion are respectively located on both sides of the cover plate; the column is provided through the cover plate, and one end of the outer circumference of the column is radially protruded outward to form the terminal portion, and the other end of the outer circumference of the column is radially protruded outward to form the rivet portion; a current collecting member connected to an end of the pole away from the terminal portion; Wherein, a rivet hole is provided on the end surface of the column away from the terminal.

2. The cover plate assembly according to claim 1, wherein: Along the radial direction of the pole, a distance L1 between the outer circumferential surface of the riveted portion and the outer circumferential surface of the column body satisfies: 3.5 mm ≤ L1 ≤ 4.5 mm.

3. The cover plate assembly according to claim 1, wherein: The diameter of the rivet hole gradually increases in a direction away from the terminal portion.

4. The cover plate assembly according to claim 1, wherein: Before the outer peripheral surface of the pole is convex to form the riveted portion, the wall thickness of the riveted hole is t, which satisfies the following: 4mm≤t≤6mm.

5. The cover plate assembly according to any one of claims 1 to 4, characterized in that: Before the outer peripheral surface of the pole is convex to form the rivet portion, the depth dimension of the rivet hole is d, which satisfies the following: 1 mm ≤ d ≤ 5 mm.

6. The cover plate assembly according to any one of claims 1 to 4, characterized in that: The current collecting piece is sleeved on the column, and one end of the current collecting piece close to the column is located between the riveted portion and the cover plate.

7. The cover plate assembly according to any one of claims 1 to 4, characterized in that: The cover plate assembly further includes a sealing ring, which is sleeved on the column and located between the column and the cover plate; Wherein, a boss is provided on a side of the terminal portion facing the cover plate, and the boss abuts against the sealing ring.

8. The cover plate assembly according to any one of claims 1 to 4, characterized in that: The cover assembly further includes an upper plastic component, which is disposed between the terminal portion and the cover, and is plugged into the terminal portion.

9. The cover plate assembly according to claim 8, wherein: A first hole is provided on a side of the terminal portion close to the cover plate, and a limiting block is provided on a side of the upper plastic component close to the terminal portion, and the limiting block is plugged into the first hole.

10. The cover plate assembly according to claim 8, wherein: The upper plastic part is partially embedded in the cover plate.

11. The cover plate assembly according to claim 10, wherein: A side of the outer peripheral surface of the upper plastic part close to the cover plate is radially protruded outward to form an extension portion, and the extension portion is embedded in the cover plate.

12. The cover plate assembly according to any one of claims 1 to 4, characterized in that: The cover plate assembly further includes a lower plastic component, which is disposed between the current collecting component and the cover plate.

13. A battery cell, characterized in that: include: A housing having a receiving cavity; an electrode assembly, disposed in the accommodating cavity; And, in the cover plate assembly according to any one of claims 1 to 12, the cover plate is covered with the shell to close the accommodating cavity, and the current collecting member is connected to the electrode assembly.

14. A battery, characterized in that: include: a battery box having a mounting cavity; And, the battery cell according to claim 13, wherein there are a plurality of said battery cells, and the plurality of said battery cells are connected in series and / or in parallel.

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