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, an insulating part and a sealing part, the plate body has a first direction; the pole comprises a first clamping piece and a second clamping piece, the first clamping piece comprises a limiting part and an inserting part, the limiting part is arranged on one side of the plate body in the first direction, and the inserting part is connected to one side, close to the plate body in the first direction, of the limiting part and penetrates through the plate body; the second clamping piece is provided with a mounting hole, the mounting hole penetrates through the second clamping piece in the first direction, the inserting part penetrates through the mounting hole and is connected with the second clamping piece, and a part of the second clamping piece is located on the side, away from the limiting part in the first direction, of the plate body. Part of the first clamping piece in the pole penetrates through the mounting hole of the second clamping piece in the pole to connect the first clamping piece and the second clamping piece to form the pole, riveting is replaced, and impact force generated during riveting is avoided.

Description

TECHNICAL FIELD

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

[0002] When the cover plate assembly is installed, the riveting block and the pole column need to be riveted so that the pole column, the sealing element and the insulating element can be positioned on the plate body.

[0003] However, during the riveting of the riveting block and the pole column, an impact is generated, and the explosion-proof valve on the cover plate assembly can be damaged after receiving the impact, thereby failing to work normally. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a cover plate assembly to solve the technical problem that the impact generated when the pole column is riveted affects the explosion-proof valve, and another object of the application is to provide a secondary battery.

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

[0006] a plate body having a first direction;

[0007] a pole column comprising a first clamping element and a second clamping element, the first clamping element comprising a limiting portion and an insertion portion, the limiting portion being arranged on one side of the plate body along the first direction, the insertion portion being connected to one side of the limiting portion along the first direction close to the plate body and penetrating the plate body, the second clamping element having a mounting hole penetrating the second clamping element along the first direction, the insertion portion penetrating the mounting hole and being connected to the second clamping element, and part of the second clamping element being located on one side of the plate body away from the limiting portion along the first direction;

[0008] an insulating element, part of the insulating element being arranged between the limiting portion and the plate body along the first direction and being connected to the limiting portion and the plate body respectively;

[0009] a sealing element, part of the sealing element being arranged between part of the second clamping element and the plate body along the first direction and being connected to the second clamping element and the plate body respectively.

[0010] In some embodiments, the first clamping element further comprises a transition portion arranged between the limiting portion and the insertion portion along the first direction and connected to the limiting portion and the insertion portion respectively, and part of the sealing element is arranged between the transition portion and the second clamping element along the first direction and connected to the transition portion and the second clamping element respectively.

[0011] In some embodiments, the sealing element comprises:

[0012] a first sealing portion disposed between the portion of the second clamping member and the plate body along the first direction and connecting the second clamping member and the plate body, respectively;

[0013] a second sealing portion connected to a side of the first sealing portion along the first direction away from the limiting portion, the second sealing portion being disposed between the portion of the second clamping member and the plate body along a direction perpendicular to the first direction and connecting the second clamping member and the plate body, respectively;

[0014] a third sealing portion connected to a side of the second sealing portion along the first direction away from the first sealing portion, a portion of the third sealing portion being disposed between the transition portion and the second clamping member along the first direction and connecting the transition portion and the second clamping member, respectively.

[0015] In some embodiments, the transition portion has a mounting groove facing the limiting portion along the first direction; the limiting portion includes a body and a protrusion connected to a side of the body along the first direction away from the second clamping member, the protrusion being embedded in the mounting groove, and the body being connected to the transition portion.

[0016] In some embodiments, the limiting portion, the transition portion and the insertion portion are an integral structure.

[0017] In some embodiments, along the first direction, the limiting portion has a maximum dimension h satisfying: h≥2mm.

[0018] In some embodiments, the transition portion has a positioning surface extending along a direction perpendicular to the first direction, the positioning surface being used to limit rotation of the pole, the positioning surface having a maximum dimension l along the direction perpendicular to the first direction satisfying: l≥5mm.

[0019] In some embodiments, the insertion portion has an end surface facing away from the limiting portion along the first direction, an area S of the end surface satisfying: S≥1.5mm 2 .

[0020] In some embodiments, along a direction perpendicular to the first direction, the limiting portion has a maximum dimension D and the transition portion has a maximum dimension d satisfying: D / 2≥1mm.

[0021] Correspondingly, the application also provides a secondary battery including the cover plate assembly as described in any of the above embodiments.

[0022] Beneficial effects: Compared with the prior art, the cover plate assembly provided by the embodiment of the application comprises a plate body, a pole, an insulating piece and a sealing piece, the plate body has a first direction; the pole comprises a first clamping piece and a second clamping piece, the first clamping piece comprises a limiting portion and an insertion portion, the limiting portion is arranged on one side of the plate body along the first direction, the insertion portion is connected to one side of the limiting portion along the first direction close to the plate body, and the insertion portion is arranged through the plate body; the second clamping piece is connected to one side of the limiting portion along the first direction close to the plate body, the second clamping piece has a mounting hole, the mounting hole penetrates through the second clamping piece along the first direction, the insertion portion is arranged through the mounting hole and connected with the second clamping piece; part of the insulating piece is arranged between the limiting portion and the plate body along the first direction and connected with the limiting portion and the plate body respectively; part of the sealing piece is arranged between part of the second clamping piece and the plate body along the first direction and connected with the second clamping piece and the plate body respectively. The embodiment of the application arranges part of the first clamping piece in the pole through the mounting hole of the second clamping piece in the pole to connect the first clamping piece and the second clamping piece to form the pole, instead of riveting, so that the impact force generated during riveting is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] The technical solutions and other beneficial effects of the application will be apparent from the following detailed description of the specific embodiments of the application in conjunction with the accompanying drawings.

[0024] Figure 1 A structural schematic diagram of the cover plate assembly provided by the embodiment of the application is shown in the figure.

[0025] Figure 2 A front view of the cover plate assembly provided by the embodiment of the application is shown in the figure.

[0026] Figure 3 A sectional view of the cover plate assembly provided by the embodiment of the application is shown in the figure.

[0027] Figure 4 A structural schematic diagram of the cover plate assembly provided by the embodiment of the application is shown in the figure. Figure 3 A detail view of the middle frame A is shown in the figure.

[0028] Figure 5 A detail view of the middle frame A is shown in the figure. Figure 3 Another detail view of the middle frame A is shown in the figure.

[0029] Figure 6 A detail view of the middle frame A in another embodiment of the application is shown in the figure.

[0030] Figure 7 A structural schematic diagram of the second clamping piece in the cover plate assembly provided by the embodiment of the application is shown in the figure.

[0031] Figure 8 A sectional view of the second clamping piece in the cover plate assembly provided by the embodiment of the application is shown in the figure.

[0032] Figure 9 A structural schematic diagram of the first clamping piece in the cover plate assembly provided by the embodiment of the application is shown in the figure.

[0033] Figure 10 A cross-sectional view of the first clamping member in the cover plate assembly according to an embodiment of the present application is provided.

[0034] Figure 11 A cross-sectional view of the first clamping member in the cover plate assembly according to another embodiment of the present application is provided.

[0035] Figure 12 A cross-sectional view of the secondary battery according to an embodiment of the present application is provided.

[0036] Figure 13 A detailed view of the middle frame B is provided. Figure 12 A detailed view of the middle frame B is provided.

[0037] Reference signs, 1000 - plate body, 1100 - pole post hole, 2000 - pole post, 2100 - first clamping member, 2110 - limiting portion, 2111 - body, 2112 - protrusion, 2113 - process groove, 2120 - insertion portion, 2121 - end face, 2130 - transition portion, 2131 - mounting groove, 2132 - positioning face, 2200 - second clamping member, 2210 - mounting hole, 2220 - connecting portion, 2221 - first surface, 2222 - second surface, 2223 - first accommodating groove, 2224 - second accommodating groove, 2230 - clamping portion, 2240 - protruding portion, 2241 - limiting face, 3000 - insulating member, 4000 - sealing member, 4100 - first sealing portion, 4200 - second sealing portion, 4300 - third sealing portion, 5000 - connecting sheet, 6000 - electrode assembly, 6100 - tab, 6200 - main body, 7000 - shell, 7100 - accommodating cavity. DETAILED DESCRIPTION

[0038] 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 the other embodiments obtained by a person skilled in the art without any creative work fall within the scope of protection of the present application.

[0039] In the description of the present application, it is necessary to point out 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 be explicitly or implicitly included one or more features.

[0040] 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.

[0041] When the cover plate assembly is installed, the riveting block and the pole 2000 need to be riveted, so that the pole 2000, the sealing element 4000 and the insulating element 3000 can be positioned on the plate body 1000.

[0042] However, during the riveting of the riveting block and the pole 2000, impact will be generated, and the explosion-proof valve on the cover plate assembly may be damaged after receiving the impact, resulting in failure to work normally. It can be understood that the impact generated by riveting can not only affect the explosion-proof valve, but also affect the already connected parts in the cover plate assembly.

[0043] In order to solve the technical problem that impact will be generated when the pole 2000 is riveted, the first embodiment of the present application provides a cover plate assembly, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 、 Figure 9 and Figure 10The cover plate assembly comprises a plate body 1000, a pole 2000, an insulating piece 3000 and a sealing piece 4000, the plate body 1000 has a first direction X; the pole 2000 comprises a first clamping piece 2100 and a second clamping piece 2200, the first clamping piece 2100 comprises a limiting part 2110 and an insertion part 2120, the limiting part 2110 is arranged on one side of the plate body 1000 along the first direction X, the insertion part 2120 is connected to the limiting part 2110 on the side close to the plate body 1000 along the first direction X and is arranged through the plate body 1000; the second clamping piece 2200 has a mounting hole 2210, the mounting hole 2210 penetrates the second clamping piece 2200 along the first direction X, the insertion part 2120 is arranged through the mounting hole 2210 and is connected to the second clamping piece 2200, and part of the second clamping piece 2200 is located on the side of the plate body 1000 away from the limiting part 2110 along the first direction X; part of the insulating piece 3000 is arranged between the limiting part 2110 and the plate body 1000 along the first direction X and is connected to the limiting part 2110 and the plate body 1000 respectively; part of the sealing piece 4000 is arranged between the part of the second clamping piece 2200 and the plate body 1000 along the first direction X and is connected to the second clamping piece 2200 and the plate body 1000 respectively.

[0044] In the drawings, the first direction X is indicated by an arrow X.

[0045] In some embodiments, the mounting hole 2210 has a hole wall, and the insertion part 2120 is connected to the hole wall.

[0046] In some embodiments, the insertion part 2120 is welded to the hole wall; in other embodiments, the insertion part 2120 and the hole wall are connected by conductive glue; in still other embodiments, the insertion part 2120 and the hole wall are directly connected, and the friction between the insertion part 2120 and the hole wall can limit the relative movement and relative rotation between the first clamping piece 2100 and the second clamping piece 2200.

[0047] In some embodiments, part of the insulating piece 3000 is arranged around the limiting part 2110 to avoid the first clamping piece 2100 from contacting other components in the battery pack to cause short circuit.

[0048] In the above embodiments, the insertion part 2120 is arranged through the mounting hole 2210 of the second clamping piece 2200 and is connected to the second clamping piece 2200, and no impact is generated during the connection process, which can avoid the impact on the explosion-proof valve and other components in the cover plate assembly.

[0049] In some embodiments, please refer to Figure 4 , Figure 9 and Figure 10The first clamping piece 2100 further comprises a transition portion 2130 disposed between the limiting portion 2110 and the insertion portion 2120 along the first direction X and connected to the limiting portion 2110 and the insertion portion 2120 respectively; and a portion of the sealing piece 4000 is disposed between the transition portion 2130 and the second clamping piece 2200 along the first direction X and connected to the transition portion 2130 and the second clamping piece 2200 respectively.

[0050] In some embodiments, the second clamping piece 2200 has a first surface 2221 and a second surface 2222 facing away from each other along the first direction X, the first surface 2221 faces the first clamping piece 2100, and the transition portion 2130 is attached to the first surface 2221.

[0051] In some embodiments, a portion of the transition portion 2130 along the first direction X is disposed in the pole hole 1100, and a portion of the sealing piece 4000 along a direction perpendicular to the first direction X is disposed between the transition portion 2130 and the plate body 1000 and connected to the transition portion 2130 and the plate body 1000 respectively, so as to prolong the sealing path of the sealing piece 4000 and improve the sealing effect of the sealing piece 4000.

[0052] In the above embodiments, the transition portion 2130 is arranged to cooperate with the second clamping piece 2200 to clamp the sealing piece 4000 along the first direction X, so as to position the sealing piece 4000 and prevent the sealing piece 4000 from moving along a direction perpendicular to the first direction X in the pole hole 1100.

[0053] In some embodiments, the sealing piece 4000 comprises a first sealing portion 4100, a second sealing portion 4200 and a third sealing portion 4300, the first sealing portion 4100 is disposed between a portion of the second clamping piece 2200 and the plate body 1000 along the first direction X and connected to the second clamping piece 2200 and the plate body 1000 respectively; the second sealing portion 4200 is connected to a side of the first sealing portion 4100 along the first direction X facing the limiting portion 2110, the second sealing portion 4200 is disposed between a portion of the second clamping piece 2200 and the plate body 1000 along a direction perpendicular to the first direction X and connected to the second clamping piece 2200 and the plate body 1000 respectively; and the third sealing portion 4300 is connected to a side of the second sealing portion 4200 along the first direction X away from the first sealing portion 4100, and a portion of the third sealing portion 4300 is disposed between the transition portion 2130 and the second clamping piece 2200 along the first direction X and connected to the transition portion 2130 and the second clamping piece 2200 respectively.

[0054] In the above embodiment, the first sealing part 4100 is arranged to enable the second clamping member 2200 to be connected to the plate body 1000 to position the pole 2000, and the sealing part 4000 made of insulating material can also avoid short circuit caused by electrical connection between the second clamping member 2200 and the plate body 1000. Meanwhile, the second sealing part 4200 is arranged to extend the sealing path of the sealing part 4000, thereby improving the sealing effect of the sealing part 4000, and the second sealing part 4200 can also insulate the second clamping member 2200 and the plate body 1000 to avoid electrical connection between the second clamping member 2200 and the plate body 1000, thereby avoiding short circuit. Meanwhile, the third sealing part 4000 can be clamped by the first clamping member 2100 and the second clamping member 2200 at the same time, so that the pole 2000 can position the sealing part 4000 to avoid the sealing part 4000.

[0055] In some embodiments, the limiting part 2110 is provided with a process groove 2113 on the surface thereof facing away from the second clamping member 2200 along the first direction X, so as to facilitate the molding of the insertion part 2120.

[0056] In some embodiments, referring to Figure 4 , Figure 9 and Figure 10 , the limiting part 2110, the transition part 2130 and the insertion part 2120 are of an integral structure. The process groove facilitates the molding of the insertion part 2120.

[0057] In some embodiments, referring to Figure 6 , Figure 9 and Figure 11 , the transition part 2130 has a mounting groove 2131 facing the limiting part 2110 along the first direction X; the limiting part 2110 includes a body 2111 and a protrusion 2112 connected to one side of the body 2111 facing the second clamping member 2200 along the first direction X, the protrusion 2112 is embedded in the mounting groove 2131, and the body 2111 is connected to the transition part 2130. The process groove is located on the surface of the body 2111 facing away from the second clamping member 2200 along the first direction X, and the process groove facilitates the molding of the protrusion 2112. Similarly, the mounting groove 2131 also facilitates the molding of the insertion part 2120.

[0058] Specifically, the transition part 2130 and the insertion part 2120 are integrally formed, and the transition part 2130 and the insertion part 2120 are made of the same material, and the transition part 2130 and the limiting part 2110 are made of different materials.

[0059] Specifically, the protrusion 2112 is embedded in the mounting groove 2131, and the surface of the limiting part 2110 facing the second clamping member 2200 along the first direction X is attached to and connected to the body 2111.

[0060] In the above embodiment, the protrusion 2112 capable of being embedded in the mounting groove 2131 makes the connection of the limiting portion 2110 and the transition portion 2130 reliable, and can avoid the inclination between the transition portion 2130 and the limiting portion 2110.

[0061] In some embodiments, referring to Figure 5 , along the first direction X, the limiting portion 2110 has a maximum size h, which satisfies: h≥2mm.

[0062] Specifically, the value of h can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm. When the value of h is larger, the pole post 2000 and other components are less likely to be welded through when being welded, and the difficulty of welding the pole post 2000 and other components is lower. When the value of h is smaller, the part of the first clamping piece 2100 exposed to the plate body 1000 is less, the size of the cover plate assembly along the first direction X is smaller, and the structure of the cover plate assembly is more compact. When the value of h is within the range defined in the embodiments of the present application, the difficulty of welding the pole post 2000 and other components is lower, and the size of the cover plate assembly along the first direction X is also smaller.

[0063] In the above embodiment, by limiting the range of the value of h, the difficulty of welding the pole post 2000 and other components is lower, and at the same time, the size of the cover plate assembly along the first direction X is smaller, and the structure of the cover plate assembly is more compact.

[0064] In some embodiments, referring to Figure 9 , the transition portion 2130 has a positioning surface 2132 extending along a direction perpendicular to the first direction X, the positioning surface 2132 is used to limit the rotation of the pole post 2000, and the positioning surface 2132 has a maximum size l along the direction perpendicular to the first direction X, which satisfies: l≥5mm.

[0065] Specifically, the value of l can be 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, 6.1mm, 6.2mm, 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7mm. When the value of l is larger, the positioning surface 2132 has a better effect of limiting the rotation of the pole post 2000 relative to the plate body 1000. When the value of l is smaller, the larger the radius of the circular arc transition surface between the two positioning surfaces 2132, the less the stress concentration, and the better the reliability of the pole post 2000. When the value of l is within the range defined in the embodiments of the present application, the limiting effect of the positioning surface 2132 is better, and the reliability of the pole post 2000 is also better.

[0066] In the above embodiment, the positioning surface 2132 is arranged to indirectly connect the pole 2000 and the plate body 1000 through the sealing member 4000, so as to limit the rotation of the pole 2000 relative to the plate body 1000. Meanwhile, the above embodiment limits the range of the value of l, so that the pole 2000 has better limiting effect and better mechanical properties.

[0067] In some embodiments, referring to Figure 9 , the insertion part 2120 has an end surface 2121 facing away from the limiting part 2110 along the first direction X, and the area S of the end surface 2121 satisfies: S≥1.5mm 2 .

[0068] Specifically, the value of S can be 1.5mm 2 , 1.6mm 2 , 1.7mm 2 , 1.8mm 2 , 1.9mm 2 , 2mm 2 , 2.1mm 2 , 2.2mm 2 , 2.3mm 2 , 2.4mm 2 , 2.5mm 2 . The larger the value of S is, the larger the size of the insertion part 2120 is, and the better the flow capacity of the insertion part 2120 is. The smaller the value of S is, the smaller the mass difference between the first clamping part 2100 and the second clamping part 2200 is, and the more stable the pole 2000 is. When the value of S is within the range defined in the embodiments of the present application, the flow capacity of the insertion part 2120 is better, and at the same time, the pole 2000 is more stable.

[0069] In the above embodiment, the value of S is limited to make the insertion part 2120 have better flow capacity, i.e. the pole 2000 has better flow capacity, and at the same time, the pole 2000 has better stability and is not easy to fall during installation, which facilitates the assembly of the cover plate assembly.

[0070] In some embodiments, along the direction perpendicular to the first direction X, the limiting part 2110 has a maximum size D, and the transition part 2130 has a maximum size d, and (D-d) / 2≥1mm.

[0071] Specifically, the value of (D-d) / 2 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm. When the value of (D-d) / 2 is larger, the size of the limiting portion 2110 along the direction perpendicular to the first direction X is larger, the area of the indirect connection between the limiting portion 2110 and the plate body 1000 is larger, the clamping effect of the limiting portion 2110 on the plate body 1000 is better, and the positioning effect of the pole column 2000 is better. When the value of (D-d) / 2 is smaller, the size of the limiting portion 2110 along the direction perpendicular to the first direction X is smaller, the first clamping piece 2100 uses less material, and the mass of the cover plate assembly is lighter. When the value of (D-d) / 2 is within the range defined in the embodiments of the present application, the clamping effect of the first clamping piece 2100 on the plate body 1000 is better, the positioning effect of the pole column 2000 is better, and the mass of the cover plate assembly is lighter.

[0072] In the above embodiments, by limiting the range of the value of (D-d) / 2, the first clamping piece 2100 can better cooperate with the second clamping piece 2200 to clamp the plate body 1000, so that the positioning effect of the pole column 2000 is better, and the material of the first clamping piece 2100 can be reduced, so that the mass of the pole column 2000 is reduced, and the mass of the cover plate assembly is further reduced.

[0073] In some embodiments, please refer to Figure 4 , Figure 7 and Figure 8The second clamping piece 2200 comprises a connecting portion 2220, a protruding portion 2240 and a clamping portion 2230. The clamping portion 2230 is arranged on the side of the plate body 1000 away from the limiting portion 2110 along the first direction X. The first sealing portion 4100 is arranged between the plate body 1000 and the clamping portion 2230 along the first direction X and is connected to the plate body 1000 and the clamping portion 2230 respectively. The connecting portion 2220 is connected to the side of the clamping portion 2230 close to the plate body 1000 along the first direction X and penetrates the pole column hole 1100. The mounting hole 2210 penetrates the connecting portion 2220 and the clamping portion 2230 along the first direction X. The connecting portion 2220 has a first surface 2221 and a second surface 2222 which are away from each other along the first direction X. The first surface 2221 is attached to and connected with the transition portion 2130. The protruding portion 2240 is arranged around the connecting portion 2220 and is sleeved with the connecting portion 2220. The protruding portion 2240 is connected to the side of the clamping portion 2230 close to the connecting portion 2220 along the first direction X. Part of the protruding portion 2240 penetrates the pole column hole 1100. Part of the sealing member 4000 is arranged between the protruding portion 2240 and the plate body 1000 along the direction perpendicular to the first direction X and is connected to the protruding portion 2240 and the plate body 1000 respectively. Part of the sealing member 4000 is arranged between the protruding portion 2240 and the transition portion 2130 along the first direction X and is connected to the protruding portion 2240 and the transition portion 2130 respectively.

[0074] In some embodiments, the protruding portion 2240 has a limiting surface 2241 extending along the direction perpendicular to the first direction X. The limiting surface 2241 is indirectly connected to the plate body 1000 through the sealing member 4000 to limit the rotation of the second clamping piece 2200 relative to the plate body 1000, to limit the rotation of the pole column 2000 relative to the plate body 1000, and to limit the relative rotation between the first clamping piece 2100 and the second clamping piece 2200.

[0075] In the above embodiments, the plate body 1000 is clamped between the limiting portion 2110 and the clamping portion 2230 to achieve the positioning of the plate body 1000 along the first direction X relative to the pole column 2000. At the same time, the connection between the connecting portion 2220 and the insertion portion 2120 also avoids the impact generated during riveting, thereby avoiding the impact on the parts such as the explosion-proof valve.

[0076] In some embodiments, referring to Figure 8 The connecting portion 2220 has a first accommodating groove 2223 arranged on the second surface 2222. The first accommodating groove 2223 surrounds the mounting hole 2210 and is in communication with the mounting hole 2210.

[0077] In the above embodiments, the first accommodating groove 2223 can allow the second clamping piece 2200 to have a lighter mass.

[0078] In some embodiments, referring to Figure 8 The connecting portion 2220 has a second accommodating groove 2224, which is arranged on the second surface 2222, surrounds the first accommodating groove 2223, and is in communication with the first accommodating groove 2223.

[0079] In the above embodiments, the second accommodating groove 2224 can allow the second clamping member 2200 to have a lighter mass.

[0080] Correspondingly, the application further provides a secondary battery comprising the cover plate assembly according to any one of the above embodiments.

[0081] Referring to Figure 12 and Figure 13 The secondary battery further comprises a shell 7000, an electrode assembly 6000, and a connecting piece 5000, wherein the shell 7000 has an accommodating cavity 7100, the electrode assembly 6000 is arranged in the accommodating cavity 7100, the electrode assembly 6000 comprises a main body 6200 and a tab 6100 connected to the main body 6200, the tab 6100 is connected to the connecting piece 5000, the cover plate assembly is connected to the shell 7000 and covers the accommodating cavity 7100, and the second clamping member 2200 is connected to the connecting piece 5000.

[0082] 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 and the core ideas of the application. 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 plate assembly, characterized by The application relates to a cover plate assembly. The cover plate assembly comprises: a plate body having a first direction; a pole column comprising a first clamping piece and a second clamping piece, the first clamping piece comprising a limiting part and an insertion part, the limiting part being arranged on one side of the plate body along the first direction, the insertion part being connected to the limiting part on the side close to the plate body along the first direction and penetrating the plate body, the second clamping piece having a mounting hole penetrating the second clamping piece along the first direction, the insertion part penetrating the mounting hole and being connected to the second clamping piece, and part of the second clamping piece being located on the side of the plate body away from the limiting part along the first direction; an insulating piece, part of the insulating piece being arranged between the limiting part and the plate body along the first direction and being connected to the limiting part and the plate body respectively; 2. The cover plate assembly of claim 1, wherein, a sealing piece, part of the sealing piece being arranged between part of the second clamping piece and the plate body along the first direction and being connected to the second clamping piece and the plate body respectively.

3. The cover plate assembly of claim 2, wherein, The first clamping piece further comprises a transition part arranged between the limiting part and the insertion part along the first direction and connected to the limiting part and the insertion part respectively; and part of the sealing piece is arranged between the transition part and the second clamping piece along the first direction and connected to the transition part and the second clamping piece respectively. The sealing piece comprises: a first sealing part arranged between part of the second clamping piece and the plate body along the first direction and connected to the second clamping piece and the plate body respectively; a second sealing part connected to the side of the first sealing part along the first direction towards the limiting part, part of the second sealing part being arranged between part of the second clamping piece and the plate body along a direction perpendicular to the first direction and connected to the second clamping piece and the plate body respectively; 4. The cover plate assembly of claim 2, wherein, a third sealing part connected to the side of the second sealing part along the first direction away from the first sealing part, part of the third sealing part being arranged between the transition part and the second clamping piece along the first direction and connected to the transition part and the second clamping piece respectively.

5. The cover plate assembly of claim 2, wherein, The transition part has a mounting groove facing the limiting part along the first direction; the limiting part comprises a body and a protrusion connected to the side of the body along the first direction towards the second clamping piece, the protrusion being embedded in the mounting groove, and the body being connected to the transition part.

6. The cover plate assembly of claim 2, wherein, The limiting part, the transition part and the insertion part are in an integral structure.

7. The cover plate assembly of claim 2, wherein, Along the first direction, the limiting part has a maximum dimension h satisfying h>=2mm.

8. The cover plate assembly of claim 2, wherein, The insertion portion has an end surface facing away from the limiting portion in the first direction, an area S of the end surface satisfying S≥1.5mm 2 .

9. The cover plate assembly of claim 2, wherein, The transition part has a positioning surface extending along a direction perpendicular to the first direction, the positioning surface being used for limiting rotation of the pole column, and the positioning surface has a maximum dimension l along the direction perpendicular to the first direction satisfying l>=5mm.

10. A secondary battery characterized by comprising: Along the direction perpendicular to the first direction, the limiting part has a maximum dimension D and the transition part has a maximum dimension d satisfying / 2>=1mm. The application further relates to a cover plate assembly comprising any one of the cover plate assemblies according to claims 1-9.

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