Cover plate assembly and secondary battery

Abstract

The utility model discloses a cover plate assembly and a secondary battery, and belongs to the technical field of batteries, the cover plate assembly comprises a plate body, a pole and a connecting piece, the plate body is provided with a first through hole penetrating through the plate body, and the first through hole is provided with a first hole wall; the pole comprises a main body part, a first limiting part and a second limiting part, the main body part penetrates through the first through hole, and the first limiting part is connected with the main body part; the second limiting part is connected with the main body part, and the first limiting part and the second limiting part are arranged at intervals; the connecting piece is provided with a second through hole, the first limiting part penetrates through the second through hole, and at least part of the connecting piece is connected to the side, close to the second limiting part, of the first limiting part; part of the plate body is clamped between the second limiting part and the connecting piece. According to the cover plate assembly, the plate body is clamped between the connecting piece and the second limiting part, so that the connecting piece has a limiting effect, and the assembly difficulty of the cover plate assembly is reduced while the types of parts are reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a cover plate and a secondary battery. BACKGROUND

[0002] The pole column and the welding block of the secondary battery are connected to clamp the plate body between the part of the pole column and the welding block, so that the plate body limits the pole column in the extension direction of the pole column hole, and the displacement of the pole column is avoided.

[0003] In the assembly process of the secondary battery, the part of the pole column needs to pass through the pole column hole first, then the welding block is welded to the pole column, and then the connecting piece is welded to the welding block to complete the assembly of the pole column part. The assembly process has multiple welding steps, and the assembly of the pole column is relatively complex. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a cover plate assembly to solve the technical problem that the assembly of the pole column is relatively complex, and another object of the application is to provide a secondary battery.

[0005] The technical scheme, the application provides a cover plate assembly, which comprises:

[0006] A plate body has a first through hole penetrating through the plate body, and the first through hole has a first hole wall;

[0007] A pole column comprises a main body part, a first limiting part and a second limiting part, the main body part is arranged in the first through hole, the first limiting part is connected with the main body part, the second limiting part is connected with the main body part, and the first limiting part and the second limiting part are arranged at intervals;

[0008] A connecting piece has a second through hole, the first limiting part is arranged in the second through hole, and at least part of the connecting piece is connected to one side of the first limiting part close to the second limiting part;

[0009] Part of the plate body is clamped between the second limiting part and the connecting piece.

[0010] In some embodiments, the main body part has a first surface, the first surface faces the first hole wall, the first limiting part has a first connecting surface, the first connecting surface is connected with the first surface, the first connecting surface faces the plate body, and the first connecting surface is inclined to the first surface;

[0011] The connecting piece has a third surface and a fourth surface facing away from each other, the third surface faces the plate body, the second through hole has a second hole wall, the second hole wall has a second connecting surface, the second connecting surface is located between the third surface and the fourth surface and connects the third surface and the fourth surface respectively, and the second connecting surface is attached to and connected with the first connecting surface.

[0012] In some embodiments, the first connecting surface and the third surface form an angle α, and 5°≤α≤75°.

[0013] In some embodiments, the first limiting portion and the main body portion are an integral structure.

[0014] In some embodiments, the pole further comprises a protruding portion, the protruding portion is arranged around the main body portion and connected with the main body portion, the protruding portion is connected to a side of the second limiting portion facing the first limiting portion and is arranged in a spaced manner with the first limiting portion, the protruding portion is arranged in the first through hole, the protruding portion has a first sealing surface and a second sealing surface, the first sealing surface is located between the first surface and the second sealing surface and connects the first surface and the second sealing surface respectively, and the first sealing surface faces the first limiting portion.

[0015] The cover plate assembly further comprises a sealing piece, the sealing piece comprises a first portion and a second portion, the first portion is connected to a side of the second portion away from the connecting piece, the first portion is arranged between the second sealing surface and the first hole wall and connects the second sealing surface and the first hole wall respectively, and part of the second portion is arranged between the first sealing surface and the connecting piece and connects the first sealing surface and the connecting piece respectively.

[0016] In some embodiments, the plate body further has a first accommodating groove, the first accommodating groove surrounds the first through hole, the first accommodating groove communicates with the first through hole, the first accommodating groove forms an opening in the plate body, and the opening faces the connecting piece; the first accommodating groove has a groove wall facing the connecting piece, the groove wall is connected with the first hole wall, and part of the second portion is arranged between the groove wall and the connecting piece and connects the groove wall and the connecting piece respectively.

[0017] In some embodiments, the connecting piece comprises a connecting portion and a pressing portion, the pressing portion is connected to a side of the connecting portion facing the plate body, the pressing portion is arranged around the main body portion, part of the second portion is located between the pressing portion and the first sealing surface and connects the pressing portion and the first sealing surface respectively, and part of the second portion is located between the pressing portion and the groove wall and connects the pressing portion and the groove wall respectively.

[0018] In some embodiments, the connecting piece has a third surface and a fourth surface facing away from each other, the third surface faces the plate body, the connecting piece further has a second accommodating groove, the second accommodating groove surrounds the second through hole, the second accommodating groove communicates with the second through hole, and the second accommodating groove penetrates the fourth surface.

[0019] In some embodiments, the first through hole extends along a first direction; along the first direction, the maximum dimension of the pole is H, and the cover plate assembly has a maximum dimension L, and H < L is satisfied.

[0020] Correspondingly, the application also provides a secondary battery comprising the cover plate assembly according to any one of the above embodiments.

[0021] Advantages: Compared with the prior art, the cover plate assembly provided by the embodiments of the application comprises a plate body, a pole and a connecting piece, the plate body has a first through hole penetrating the plate body, the first through hole has a first hole wall; the pole comprises a main body portion, a first limiting portion and a second limiting portion, the main body portion is arranged in the first through hole, and the first limiting portion is connected to the main body portion; the second limiting portion is connected to the main body portion, and the first limiting portion and the second limiting portion are arranged at intervals; the connecting piece has a second through hole, the first limiting portion is arranged in the second through hole, and at least part of the connecting piece is connected to one side of the first limiting portion close to the second limiting portion; wherein part of the plate body is clamped between the second limiting portion and the connecting piece. According to the application, the plate body is clamped between the connecting piece and the second limiting portion, so that the connecting piece has a limiting effect, thereby enabling the pole to be positioned without the need for a connecting welding block, reducing the types of parts, simplifying the assembly steps of the pole portion in the assembly process of the cover plate assembly, and reducing the assembly difficulty of the cover plate assembly. BRIEF DESCRIPTION OF DRAWINGS

[0022] The technical solutions and other advantages of the application will become apparent from the following detailed description of the application, taken in conjunction with the accompanying drawings.

[0023] Figure 1 A structural schematic diagram of the cover plate assembly provided by the embodiments of the application is shown in the figure;

[0024] Figure 2 Another angle of the structural schematic diagram of the cover plate assembly provided by the embodiments of the application is shown in the figure;

[0025] Figure 3 A top view of the cover plate assembly provided by the embodiments of the application is shown in the figure;

[0026] Figure 4 A structural schematic diagram of the cover plate assembly provided by the embodiments of the application is shown in the figure; Figure 3 A sectional view at A-A in the figure;

[0027] Figure 5 A structural schematic diagram of the cover plate assembly provided by the embodiments of the application is shown in the figure; Figure 4Detail view at circle C;

[0028] Figure 6 For Figure 4 Another detail view at circle C;

[0029] Figure 7 For Figure 3 Sectional view at B-B;

[0030] Figure 8 For Figure 7 Detail view at circle D;

[0031] Figure 9 Structure diagram of the connecting piece in the cover plate assembly provided by the embodiment of the present application;

[0032] Figure 10 Structure diagram of the connecting piece in the cover plate assembly provided by the embodiment of the present application from another angle;

[0033] Reference signs, 100 - plate body, 110 - first through hole, 120 - first hole wall, 130 - first accommodating groove, 131 - opening, 140 - groove wall, 200 - pole, 210 - main body part, 211 - first surface, 220 - first limiting part, 221 - first connecting surface, 230 - protruding part, 231 - first sealing surface, 232 - second sealing surface, 240 - second limiting part, 300 - connecting piece, 310 - second through hole, 320 - second hole wall, 321 - second connecting surface, 330 - third surface, 340 - fourth surface, 350 - connecting part, 360 - extrusion part, 370 - second accommodating groove, 400 - sealing member, 410 - first part, 420 - second part. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] In the description of the present application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication 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. In the description of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise explicitly specified and limited. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features.

[0036] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0037] The pole 200 of the secondary battery is connected with the welding block to clamp the plate body 100 between the part of the pole 200 and the welding block, so as to realize the limiting of the plate body 100 to the pole 200 in the extending direction of the pole 200 hole, and avoid the displacement of the pole 200.

[0038] In the assembly process of the secondary battery, the part of the pole 200 needs to pass through the pole 200 hole first, and then the welding block is welded on the pole 200, and then the connecting piece 300 is welded on the welding block to complete the assembly of the part of the pole 200. The assembly process has multiple welding steps, and the assembly of the pole 200 is more complex.

[0039] In order to solve the technical problem that the assembly of the pole 200 is more complex, the first embodiment of the present application provides a cover plate assembly, please refer to Figure 1 and Figure 2The cover plate assembly comprises a plate body 100, a pole column 200 and a connecting piece 300. The plate body 100 has a first through hole 110 penetrating the plate body 100, and the first through hole 110 has a first hole wall 120. The pole column 200 comprises a main body part 210, a first limiting part 220 and a second limiting part 240. The main body part 210 is arranged in the first through hole 110, and the main body part 210 has a first surface 211 facing the first hole wall 120. The first limiting part 220 is connected to the first surface 211. The second limiting part 240 is connected to the first surface 211, and the first limiting part 220 and the second limiting part 240 are arranged at intervals. The connecting piece 300 has a second through hole 310, and the first limiting part 220 is arranged in the second through hole 310. At least part of the connecting piece 300 is connected to one side of the first limiting part 220 close to the second limiting part 240. Part of the plate body 100 is clamped between the second limiting part 240 and the connecting piece 300.

[0040] In some embodiments, the second limiting part 240 is arranged in the second through hole 310. In other embodiments, at least part of the second limiting part 240 is exposed to the second through hole 310.

[0041] In some embodiments, the connecting piece 300 is entirely connected to one side of the first limiting part 220 close to the second limiting part 240. In other embodiments, part of the connecting piece 300 is connected to one side of the first limiting part 220 close to the second limiting part 240, and another part of the connecting piece 300 is connected to the first limiting part 220 in the direction from the pole column 200 to the tab.

[0042] In some embodiments, the connecting piece 300 and the first limiting part 220 are welded. It can be understood that when the connecting piece 300 is arranged on the pole column 200, since the first limiting part 220 is connected to the first surface 211 of the main body part 210, and at least part of the connecting piece 300 is connected to one side of the first limiting part 220 close to the second limiting part 240, the first limiting part 220 can avoid the connecting piece 300 moving in the extending direction of the pole column 200 away from the plate body 100, so as to realize positioning of the connecting piece 300, and facilitate welding of the connecting piece 300 and the first limiting part 220.

[0043] In the above embodiments, part of the plate body 100 is located between the second limiting part 240 and the connecting piece 300, and part of the plate body 100 is clamped between the second limiting part 240 and the connecting piece 300, i.e. the plate body 100 is positioned relative to the pole column 200 in the extending direction of the pole column 200, i.e. the connecting piece 300 for electrically connecting the tab of the electrode assembly also realizes the function of positioning the pole column 200, and the cover plate assembly does not need to additionally arrange a welding block to position the pole column 200, thereby reducing the types of parts and simplifying the assembly difficulty of the cover plate assembly.

[0044] In some embodiments, referring to Figure 10 The first limiting part 220 has a first connecting surface 221, the first connecting surface 221 is connected with the first surface 211, the first connecting surface 221 faces the plate body 100, and the first connecting surface 221 is inclined to the first surface 211.

[0045] The connecting sheet 300 has a third surface 330 and a fourth surface 340 facing away from each other, the third surface 330 faces the plate body 100, the second through hole 310 has a second hole wall 320, the second hole wall 320 has a second connecting surface 321, the second connecting surface 321 is located between the third surface 330 and the fourth surface 340 and is connected with the third surface 330 and the fourth surface 340 respectively, and the second connecting surface 321 is attached to and connected with the first connecting surface 221.

[0046] In some embodiments, referring to Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8 The first connecting surface 221 is a conical surface; that is, the first connecting surface 221 is neither perpendicular to the first surface 211 nor parallel to the first surface 211.

[0047] In the above embodiments, by setting the first connecting surface 221 and the second connecting surface 321 that can be attached to and connected with each other, the connecting area of the connecting sheet 300 and the first limiting part 220 can be increased, so that the connection of the connecting sheet 300 and the first limiting part 220 is more stable. At the same time, since the first connecting surface 221 is inclined to the first surface 211 and the second connecting surface 321 can be attached to the first connecting surface 221, it means that the second connecting surface 321 is also inclined to the first surface 211. When the connecting sheet 300 is sleeved on the pole 200, when the connecting sheet 300 moves in the direction away from the plate body 100 along the extension direction of the pole 200, the inclined first connecting surface 221 and the second connecting surface 321 can automatically center the connecting sheet 300 after contacting, so that the first limiting part 220 can position the connecting sheet 300, and the connection difficulty of the connecting sheet 300 and the pole 200 is reduced, thereby reducing the assembly difficulty of the cover plate assembly.

[0048] In some embodiments, referring to Figure 6 The angle α between the first connecting surface 221 and the plane where the third surface 330 is located satisfies: 5°≤α≤75°.

[0049] In the above embodiments, the value of a can be 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°. The smaller the value of a, the better the limiting effect of the first limiting portion 220 on the connecting sheet 300 along the extension direction of the pole 200, which can prevent the connecting sheet 300 from being separated from the pole 200 before being welded with the first limiting portion 220. The larger the value of a, the better the positioning effect of the first limiting portion 220 on the connecting sheet 300, which can better center the connecting sheet 300 with the pole 200. When the value of a is within the range defined in the present application, the first limiting portion 220 can better limit and position the connecting sheet 300.

[0050] In some embodiments, referring again to Figure 5 and Figure 7 , the first limiting portion 220 and the main body portion 210 are an integral structure.

[0051] In some embodiments, the pole 200 has a blind hole, part of the main body portion 210 surrounds the blind hole, and the first limiting portion 220 is obtained by turning the main body portion 210 outward away from the blind hole.

[0052] During the assembly of the cover plate, the pole 200 passes through the cover plate, the connecting sheet 300 is sleeved on the pole 200, and then the end of the main body portion 210 is turned outward to form the first limiting portion 220 to limit the connecting sheet 300, preventing the connecting sheet 300 from moving away from the plate body 100 to be separated from the pole 200.

[0053] Specifically, the first limiting portion 220 and the main body portion 210 are both annular, the maximum size of the first limiting portion 220 is greater than the maximum size of the main body portion 210 in the direction perpendicular to the extension direction of the pole 200, and the maximum size of the first limiting portion 220 is greater than the maximum size of the second through hole 310 to limit the connecting sheet 300.

[0054] In the above embodiment, since the first limiting portion 220 is in an integral structure with the main body portion 210, and the first limiting portion 220 is obtained by turning the main body portion 210 outward, the limiting of the connecting sheet 300 by the pole post 200 is realized, and the number of parts of the pole post 200 is reduced, and the assembly difficulty of the cover plate assembly is further reduced.

[0055] In some embodiments, referring again to Figure 5 and Figure 7 , the pole post 200 further comprises a protruding portion 230, the protruding portion 230 is arranged around the main body portion 210 and connected with the first surface 211, the protruding portion 230 is connected to the side of the second limiting portion 240 facing the first limiting portion 220 and is arranged in a spaced manner with the first limiting portion 220, the protruding portion 230 is provided through the first through hole 110, the protruding portion 230 has a first sealing surface 231 and a second sealing surface 232, the first sealing surface 231 is located between the first surface 211 and the second sealing surface 232 and is connected with the first surface 211 and the second sealing surface 232 respectively, and the first sealing surface 231 faces the first limiting portion 220.

[0056] The cover plate assembly further comprises a sealing member 400, the sealing member 400 comprises a first portion 410 and a second portion 420, the first portion 410 is connected to the side of the second portion 420 away from the connecting sheet 300, the first portion 410 is arranged between the second sealing surface 232 and the first hole wall 120 and is connected with the second sealing surface 232 and the first hole wall 120 respectively; part of the second portion 420 is arranged between the first sealing surface 231 and the connecting sheet 300 and is connected with the first sealing surface 231 and the connecting sheet 300 respectively.

[0057] In some embodiments, the sealing member 400 is a sealing ring sleeved on the pole post 200.

[0058] In the above embodiment, the first portion 410 is used to fill the gap between the pole post 200 and the cover plate, seal the connection between the pole post 200 and the cover plate, and isolate the two sides of the cover plate; the second portion 420 is used to extend the sealing path of the first portion 410 and improve the sealing effect of the sealing member 400. At the same time, the protruding portion 230 is arranged around the main body portion 210 to increase the maximum dimension of the pole post 200 along the direction perpendicular to the extension direction of the pole post 200, increase the degree of elastic deformation of the sealing member 400, and improve the sealing effect of the sealing member 400.

[0059] In some embodiments, part of the second portion 420 is arranged between the plate body 100 and the connecting sheet 300 and is connected with the plate body 100 and the connecting sheet 300 respectively.

[0060] In the above embodiment, the part of the second portion 420 is clamped between the plate body 100 and the connecting piece 300, further increasing the sealing path of the sealing member 400, and further improving the sealing effect of the sealing member 400. At the same time, the first portion 410 insulates the pole post 200 from the plate body 100, avoiding short circuit between the pole post 200 and the plate body 100, and the part of the second portion 420 insulates the connecting piece 300 from the plate body 100, avoiding short circuit between the connecting piece 300 and the plate body 100, improving the reliability of the cover plate assembly.

[0061] In some embodiments, referring to Figure 5 and Figure 7 , the plate body 100 further has a first accommodating groove 130, the first accommodating groove 130 surrounds the first through hole 110, the first accommodating groove 130 is in communication with the first through hole 110, the first accommodating groove 130 forms an opening 131 on the plate body 100, and the opening 131 faces the connecting piece 300; the first accommodating groove 130 has a groove wall 140 facing the connecting piece 300, the groove wall 140 is connected with the first hole wall 120, and the part of the second portion 420 is arranged between the groove wall 140 and the connecting piece 300 and connected with the groove wall 140 and the connecting piece 300, respectively.

[0062] In the above embodiment, the part of the second portion 420 is clamped between the plate body 100 and the connecting piece 300, further increasing the sealing path of the sealing member 400, and further improving the sealing effect of the sealing member 400. At the same time, the first portion 410 insulates the pole post 200 from the plate body 100, avoiding short circuit between the pole post 200 and the plate body 100, and the part of the second portion 420 insulates the connecting piece 300 from the plate body 100, avoiding short circuit between the connecting piece 300 and the plate body 100, improving the reliability of the cover plate assembly. In addition, the first accommodating groove 130 is used to accommodate the second portion 420, so that the second portion 420 has sufficient size in the extension direction of the pole post 200, thereby having good elastic deformation capacity, and further making the sealing performance of the sealing member 400 better, but without making the second portion 420 occupy too much size in the extension direction of the pole post 200, so that the structure of the cover plate assembly is more compact.

[0063] In some embodiments, referring to Figure 5 , Figure 7 and Figure 9 , the connecting piece 300 comprises a connecting portion 350 and a pressing portion 360, the pressing portion 360 is connected to one side of the connecting portion 350 facing the plate body 100, the pressing portion 360 is arranged around the main body portion 210, and the part of the second portion 420 is located between the pressing portion 360 and the first sealing surface 231 and connected with the pressing portion 360 and the first sealing surface 231, respectively; the part of the second portion 420 is located between the pressing portion 360 and the groove wall 140 and connected with the pressing portion 360 and the groove wall 140, respectively.

[0064] In the above embodiments, the extrusion part 360 can further compress the second part 420 in the dimension along the extension direction of the pole column 200, so that the second part 420 has a larger elastic deformation range, thereby having a better sealing effect. In some embodiments, the minimum dimension of the extrusion part 360 along the direction perpendicular to the extension direction of the pole column 200 is greater than the minimum dimension of the second part 420 along the direction perpendicular to the extension direction of the pole column 200, so that the extrusion part 360 can completely cover the second part 420, and the extrusion effect of the second part 420 is better.

[0065] In some embodiments, the connecting sheet 300 has a third surface 330 and a fourth surface 340 facing away from each other, the third surface 330 faces the plate body 100, and the connecting sheet 300 further has a second accommodating groove 370 surrounding the second through hole 310, the second accommodating groove 370 communicates with the second through hole 310, and the second accommodating groove 370 penetrates the fourth surface 340.

[0066] In some embodiments, the connecting sheet 300 is welded to the first limiting part 220.

[0067] It can be understood that after the connecting sheet 300 and the first limiting part 220 are welded, a welding flash will be generated between the first limiting part 220 and the connecting sheet 300. Specifically, a welding flash can be generated at the connection between the first connecting surface 221 and the second connecting surface 321 away from the third surface 330.

[0068] In the above embodiments, the second accommodating groove 370 can accommodate the welding flash generated by welding, so as to avoid the welding flash protruding from the fourth surface 340, thereby avoiding the increase of the dimension of the cover plate assembly along the extension direction of the pole column 200, and avoiding the welding flash contacting other components after the cover plate assembly is assembled to the secondary battery, thereby avoiding short circuit and improving the use reliability of the cover plate assembly.

[0069] In some embodiments, the first through hole 110 extends along the first direction X; along the first direction X, the pole column 200 has a maximum dimension H, and the cover plate assembly has a maximum dimension L, and the following condition is satisfied: H < L.

[0070] In some embodiments, the maximum dimension L of the cover plate assembly is the maximum distance between the pole column 200 and the connecting sheet 300.

[0071] Wherein, the first direction X is the direction indicated by the arrow in the drawing, and the first direction X is also the extension direction of the pole column 200.

[0072] In the above embodiments, by limiting the relationship between H and L to avoid the exposed end of the pole 200 connected with the connecting piece 300 from the second through hole 310, the size of the cover plate assembly in the first direction X is smaller, and the structure of the cover plate assembly is more compact. At the same time, it can also avoid the part of the pole 200 exposed from the second through hole 310 after the cover plate assembly is assembled to the secondary battery from contacting other components to cause short circuit, and the use reliability of the cover plate assembly is improved.

[0073] Correspondingly, the application also provides a secondary battery comprising the cover plate assembly according to any one of the above embodiments.

[0074] In some embodiments, the secondary battery further comprises a shell having a receiving cavity, the plate body 100 is connected with the shell and covers the receiving cavity, and the connecting piece 300 is arranged in the receiving cavity; and an electrode assembly arranged in the receiving cavity, the electrode assembly comprising a body and a tab, and the tab is connected with the connecting piece 300.

[0075] The above describes in detail the cover plate assembly and the secondary battery provided by the embodiments of the application. The principles and implementation manners of the application are described by applying specific examples. The above descriptions of the embodiments are only used to help understand the technical solutions of the application and the core ideas thereof. Those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced equivalently, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A cover assembly, characterized by The utility model relates to a cover plate assembly, comprising: a plate body having a first through hole penetrating through the plate body, the first through hole having a first hole wall; a pole including a main body portion, a first limiting portion and a second limiting portion, the main body portion penetrating the first through hole, the first limiting portion being connected with the main body portion, the second limiting portion being connected with the main body portion, the first limiting portion and the second limiting portion being spaced apart; a connecting sheet having a second through hole, the first limiting portion penetrating the second through hole, at least a portion of the connecting sheet being connected to a side of the first limiting portion close to the second limiting portion; wherein a portion of the plate body is clamped between the second limiting portion and the connecting sheet.

2. The cover plate assembly according to claim 1, wherein the main body portion has a first surface facing the first hole wall, the first limiting portion has a first connecting surface connected with the first surface, the first connecting surface facing the plate body, the first connecting surface being inclined to the first surface; the connecting sheet has a third surface and a fourth surface facing away from each other, the third surface facing the plate body, the second through hole has a second hole wall, the second hole wall has a second connecting surface between and connected with the third surface and the fourth surface, the second connecting surface being in contact with and connected to the first connecting surface.

3. The cover plate assembly of claim 2, wherein, an included angle α between the first connecting surface and a plane where the third surface and the fourth surface are located satisfies 5°≤α≤75°.

4. The cover plate assembly of claim 1, wherein, the first limiting portion and the main body portion are in an integral structure.

5. The cover plate assembly according to claim 2, wherein the pole further includes a protruding portion surrounding and connected with the main body portion, the protruding portion being connected to a side of the second limiting portion facing the first limiting portion and being spaced apart from the first limiting portion, the protruding portion penetrating the first through hole, the protruding portion having a first sealing surface and a second sealing surface, the first sealing surface being between and connected with the first surface and the second sealing surface, the first sealing surface facing the first limiting portion; the cover plate assembly further includes a sealing member including a first portion and a second portion, the first portion being connected to a side of the second portion away from the connecting sheet, the first portion being disposed between and connected with the second sealing surface and the first hole wall, a portion of the second portion being disposed between and connected with the first sealing surface and the connecting sheet.

6. The cover plate assembly of claim 5, wherein, The plate body further has a first accommodating groove surrounding the first through hole, the first accommodating groove being in communication with the first through hole, the first accommodating groove forming an opening in the plate body, the opening facing the connecting piece; the first accommodating groove has a groove wall facing the connecting piece, the groove wall being connected with the first hole wall, the part of the second portion being arranged between the groove wall and the connecting piece and being connected with the groove wall and the connecting piece respectively.

7. The cover plate assembly of claim 6, wherein, The connecting piece comprises a connecting portion and a pressing portion, the pressing portion being connected to one side of the connecting portion facing the plate body, the pressing portion being arranged around the main portion, the part of the second portion being located between the pressing portion and the first sealing surface and being connected with the pressing portion and the first sealing surface respectively; the part of the second portion being located between the pressing portion and the groove wall and being connected with the pressing portion and the groove wall respectively.

8. The cover plate assembly of claim 1, wherein, The connecting piece has a third surface and a fourth surface facing away from each other, the third surface facing the plate body, the connecting piece further has a second accommodating groove surrounding the second through hole, the second accommodating groove being in communication with the second through hole, the second accommodating groove penetrating through the fourth surface.

9. The cover plate assembly of claim 1, wherein, The first through hole extends along a first direction; along the first direction, the maximum size of the pole column is H; the cover plate assembly has a maximum size L, and H < L is satisfied.

10. A secondary battery characterized by comprising: The cover plate assembly comprises any one of claims 1-9. The cover plate assembly comprises any one of claims 1-9.

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