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 secondary battery 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, and part of the first clamping piece is arranged on one side, in the first direction, of the plate body; the second clamping piece is partially arranged on the side, away from the first clamping piece in the first direction, of the plate body, the second clamping piece partially penetrates through the plate body, the second clamping piece is provided with a mounting hole, the mounting hole is provided with an opening, the opening faces the first clamping piece, and the first clamping piece partially penetrates through the mounting hole and is connected with the second clamping piece. 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, impact is generated, and the explosion-proof valve on the cover plate assembly can be damaged after receiving the impact, resulting in failure 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] The technical scheme, the application provides a cover plate assembly, which comprises:

[0006] A plate body, the plate body has a first direction;

[0007] A pole column, the pole column comprises a first clamping element and a second clamping element, part of the first clamping element is arranged on one side of the plate body along the first direction; part of the second clamping element is arranged on the side of the plate body away from the first clamping element along the first direction, part of the second clamping element is arranged through the plate body, the second clamping element has a mounting hole, the mounting hole has an opening, the opening faces the first clamping element, part of the first clamping element is arranged through the mounting hole and connected with the second clamping element;

[0008] An insulating element, part of the insulating element is arranged between the first clamping element and the plate body and connected with the first clamping element and the plate body respectively;

[0009] A sealing element, part of the sealing element is arranged between the second clamping element and the plate body and connected with the second clamping element and the plate body respectively.

[0010] In some embodiments, the plate body has a pole column hole, part of the first clamping element is arranged through the pole column hole; the sealing element comprises a first sealing part, the first sealing part is arranged between part of the second clamping element and the plate body and connected with the second clamping element and the plate body respectively, and the second clamping element comprises:

[0011] The connecting portion is provided with a first surface and a second surface which are away from each other along the first direction, and the opening is located on the first surface, and the first surface is connected with the first clamping member;

[0012] The clamping portion is connected to one side of the first sealing portion away from the plate body along the first direction, and the clamping portion is sleeved with the connecting portion.

[0013] In some embodiments, the mounting hole penetrates through the first surface and the second surface along the first direction.

[0014] In some embodiments, the second clamping member further comprises a protruding portion, the protruding portion is sleeved with the connecting portion, the protruding portion is connected with the clamping portion, the protruding portion is spaced apart from the first clamping member, and the protruding portion is provided in the pole hole;

[0015] The sealing member further comprises a second sealing portion, the second sealing portion is connected to one side of the first sealing portion away from the clamping portion along the first direction, the second sealing portion is arranged between the protruding portion and the plate body along a direction perpendicular to the first direction, and the second sealing portion is connected with the protruding portion and the plate body respectively.

[0016] In some embodiments, the sealing member further comprises a third sealing portion, the third sealing portion is connected to one side of the second sealing portion away from the first sealing portion along the first direction, and part of the third sealing portion is arranged between the protruding portion and the first clamping member along the first direction, and the third sealing portion is connected with the protruding portion and the first clamping member respectively.

[0017] Wherein, along a direction perpendicular to the first direction, the third sealing portion is spaced apart from the connecting portion, and the third sealing portion and the connecting portion have a minimum distance G, which satisfies: 0.2mm≤G≤0.35mm.

[0018] In some embodiments, along a direction perpendicular to the first direction, the mounting hole has a maximum size D, the connecting portion has a maximum size W1, the protruding portion has a maximum size W2, and the clamping portion has a maximum size W3, which satisfy: (W1-D) / 2≥2.5mm; and / or, (W2-W1) / 2≥1.2mm; and / or, (W3-W2) / 2≥1.2mm.

[0019] In some embodiments, the connecting portion has a first accommodating groove, the first accommodating groove is arranged on the second surface, the first accommodating groove surrounds the mounting hole and is in communication with the mounting hole, the first accommodating groove has a groove wall, the groove wall is away from the first surface along the first direction, and a minimum distance T between the first surface and the groove wall along the first direction satisfies T≥1.2 mm.

[0020] In some embodiments, the protruding portion has a limiting surface, the limiting surface extends along a direction perpendicular to the first direction, the limiting surface is used for limiting rotation of the pole, and a maximum dimension L of the limiting surface along a direction perpendicular to the first direction satisfies L≥5 mm.

[0021] In some embodiments, a minimum distance H1 between the clamping portion and the plate body along the first direction, and a minimum distance H2 between the protruding portion and the first clamping piece satisfy H1≥0.7 mm and H2≥0.7 mm, and / or a maximum dimension H3 of the protruding portion along the first direction satisfies H3-H1≥0.5 mm.

[0022] Correspondingly, the application also provides a secondary battery including the cover plate assembly as any one of the above embodiments.

[0023] Beneficial effects: compared with the prior art, the secondary battery provided by the embodiments of the application includes a plate body, a pole, an insulating piece and a sealing piece, the plate body has a first direction, the pole includes a first clamping piece and a second clamping piece, part of the first clamping piece is arranged on one side of the plate body along the first direction, part of the second clamping piece is arranged on a side of the plate body away from the first clamping piece along the first direction, the part of the second clamping piece is arranged through the plate body, the second clamping piece has a mounting hole, the mounting hole has an opening, the opening faces the first clamping piece, part of the first clamping piece is arranged through the mounting hole and connected with the second clamping piece, part of the insulating piece is arranged between the first clamping piece and the plate body and connected with the first clamping piece and the plate body respectively, and part of the sealing piece is arranged between the second clamping piece and the plate body and connected with the second clamping piece and the plate body respectively. In the application, part of the first clamping piece in the pole is arranged 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

[0024] 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.

[0025] Figure 1 A structural schematic diagram of the cover plate assembly provided by the embodiments of the application is shown in the drawings.

[0026] Figure 2 This is a front view of the cover plate assembly provided in an embodiment of this application;

[0027] Figure 3 A cross-sectional view of the cover plate assembly provided in an embodiment of this application;

[0028] Figure 4 for Figure 3 Detailed view of section A in the middle frame;

[0029] Figure 5 for Figure 3 Another detail image of section A in the middle frame;

[0030] Figure 6 This is a detailed view of box A in another embodiment of this application;

[0031] Figure 7 This is a schematic diagram of the structure of the second clamping member in the cover plate assembly provided in the embodiments of this application;

[0032] Figure 8 A cross-sectional view of the second clamping member in the cover plate assembly provided in the embodiments of this application;

[0033] Figure 9 This is a schematic diagram of the structure of the first clamping member in the cover plate assembly provided in the embodiments of this application;

[0034] Figure 10 A cross-sectional view of the first clamping member in the cover plate assembly provided in the embodiments of this application;

[0035] Figure 11 A cross-sectional view of the first clamping member in a cover plate assembly provided in another embodiment of this application;

[0036] Figure 12 A cross-sectional view of a secondary battery provided in an embodiment of this application;

[0037] Figure 13 for Figure 12 Detailed view of section B in the middle frame;

[0038] 1000-plate body, 1100-pole post hole, 2000-pole post, 2100-first clamping piece, 2110-limiting part, 2111-body, 2112-bump, 2113-process groove, 2120-inserting part, 2130-transition part, 2131-mounting groove, 2132-positioning surface, 2200-second clamping piece, 2210-mounting hole, 2220-connecting part, 2221-first surface, 2222-second surface, 2223-first accommodating groove, 2224-second accommodating groove, 2225-groove wall, 2230-clamping part, 2240-protruding part, 2241-limiting surface, 3000-insulating piece, 4000-sealing piece, 4100-first sealing part, 4200-second sealing part, 4300-third sealing part, 5000-connecting sheet, 6000-electrode assembly, 6100-tab, 6200-main body, 7000-housing, 7100-accommodating cavity. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described 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.

[0040] In the description of the present application, it should be noted 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, or 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 "multiple" 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.

[0041] 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.

[0042] 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.

[0043] However, during the riveting of the riveting block and the pole 2000, an impact will be generated, and the explosion-proof valve on the cover plate assembly will 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 parts in the cover plate assembly that have been connected.

[0044] To solve the technical problem that an 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 and Figure 6 The cover plate assembly includes a plate body 1000, a pole 2000, an insulating element 3000 and a sealing element 4000, the plate body 1000 has a first direction X; the pole 2000 includes a first clamping element 2100 and a second clamping element 2200, part of the first clamping element 2100 is arranged on one side of the plate body 1000 along the first direction X; part of the second clamping element 2200 is arranged on the side of the plate body 1000 away from the first clamping element 2100 along the first direction X, part of the second clamping element 2200 is arranged through the plate body 1000, the second clamping element 2200 has a mounting hole 2210, the mounting hole 2210 has an opening, the opening is directed to the first clamping element 2100, part of the first clamping element 2100 is arranged through the mounting hole 2210 and connected with the second clamping element 2200; part of the insulating element 3000 is arranged between the first clamping element 2100 and the plate body 1000 and connected with the first clamping element 2100 and the plate body 1000 respectively; part of the sealing element 4000 is arranged between the second clamping element 2200 and the plate body 1000 and connected with the second clamping element 2200 and the plate body 1000 respectively.

[0045] In some embodiments, the mounting hole 2210 has a hole wall, and part of the first clamping element 2100 is connected with the hole wall.

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

[0047] In the above embodiment, the part of the first clamping member 2100 is arranged in the mounting hole 2210 of the second clamping member 2200 and connected with the second clamping member 2200, and no impact is generated in the process of connection, so that the explosion-proof valve and other components in the cover plate assembly are prevented from being impacted.

[0048] In some embodiments, referring to Figure 4 、 Figure 7 and Figure 8 , the plate body 1000 has a pole hole 1100, and the part of the first clamping member 2100 is arranged in the pole hole 1100; the sealing member 4000 includes a first sealing part 4100 arranged between the part of the second clamping member 2200 and the plate body 1000 and connected with the second clamping member 2200 and the plate body 1000 respectively, the second clamping member 2200 includes a connecting part 2220 and a clamping part 2230, the connecting part 2220 is arranged in the pole hole 1100, the connecting part 2220 has a first surface 2221 and a second surface 2222 which are away from each other along the first direction X, the opening is located on the first surface 2221, and the first surface 2221 is connected with the first clamping member 2100; the clamping part 2230 is connected to the side of the first sealing part 4100 away from the plate body 1000 along the first direction X, and the clamping part 2230 is sleeved on the connecting part 2220.

[0049] Specifically, the clamping part 2230 is arranged around the connecting part 2220 and connected with the connecting part 2220 along a direction perpendicular to the first direction X.

[0050] In the above embodiment, the connecting part 2220 is used to connect the first clamping member 2100 arranged in the pole hole 1100, and the clamping part 2230 is used to indirectly connect the plate body 1000 through the first sealing part 4100, so that the part of the first clamping member 2100 is clamped on both sides of the plate body 1000 along the first direction X, thereby achieving the positioning of the pole 2000 along the first direction X. At the same time, the first sealing part 4100 not only realizes the function of sealingly connecting the clamping part 2230 and the plate body 1000, but also separates the plate body 1000 and the clamping part 2230 by the insulating member 3000 made of insulating material in some embodiments, so as to avoid short circuit caused by direct connection of the plate body 1000 and the clamping part 2230, and improve the reliability of the cover plate assembly.

[0051] In some embodiments, referring to Figure 4 , the mounting hole 2210 penetrates the first surface 2221 and the second surface 2222 along the first direction X.

[0052] It can be understood that, in some embodiments, the size of the part of the first clamping piece 2100 used to extend into the mounting hole 2210 is substantially consistent with the mounting hole 2210, i.e., the part of the first clamping piece 2100 used to extend into the mounting hole 2210 is in a transition fit or even an interference fit with the mounting hole 2210.

[0053] In the above embodiment, the mounting hole 2210 is arranged as a through hole penetrating through the first surface 2221 and the second surface 2222, which can cause the gas in the mounting hole 2210 to be discharged from the opening at the other end of the mounting hole 2210 when the part of the first clamping piece 2100 extends into the mounting hole 2210, thereby reducing the connection difficulty of the first clamping piece 2100 and the second clamping piece 2200. In addition, when the first clamping piece 2100 and the hole wall are welded, the welding can be performed from the opening formed by the mounting hole 2210 on the second surface 2222, thereby facilitating the implementation of the welding process.

[0054] In some embodiments, referring to Figure 4 , the second clamping piece 2200 further includes a protruding portion 2240, the protruding portion 2240 is sleeved on the connecting portion 2220, the protruding portion 2240 is connected with the clamping portion 2230, the protruding portion 2240 is arranged in a spaced manner with the first clamping piece 2100, and the protruding portion 2240 is arranged in the pole hole 1100; the sealing piece 4000 further includes a second sealing portion 4200, the second sealing portion 4200 is connected to the side of the first sealing portion 4100 away from the clamping portion 2230 along the first direction X, the second sealing portion 4200 is arranged between the protruding portion 2240 and the plate body 1000 along the direction perpendicular to the first direction X, and is connected with the protruding portion 2240 and the plate body 1000, respectively.

[0055] In some embodiments, the protruding portion 2240 is arranged around the connecting portion 2220 and is connected with the connecting portion 2220 along the direction perpendicular to the first direction X.

[0056] In the above embodiment, by arranging the protruding portion 2240 to increase the size of the part of the second clamping piece 2200 in the pole hole 1100 along the direction perpendicular to the first direction X, the elastic deformation degree of the second sealing portion 4200 is larger, the sealing effect of the second sealing portion 4200 is better, and thus the reliability of the cover plate assembly is better.

[0057] In some embodiments, referring to Figure 4 and Figure 5The sealing member 4000 further comprises a third sealing portion 4300 connected to the second sealing portion 4200 on a side of the second sealing portion 4200 away from the first sealing portion 4100 along the first direction X, and part of the third sealing portion 4300 is arranged between the protruding portion 2240 and the first clamping member 2100 along the first direction X and is connected to the protruding portion 2240 and the first clamping member 2100 respectively; wherein the third sealing portion 4300 is arranged apart from the connecting portion 2220 along a direction perpendicular to the first direction X, and the third sealing portion 4300 and the connecting portion 2220 have a minimum distance G therebetween, which satisfies: 0.2mm≤G≤0.35mm.

[0058] In some embodiments, the third sealing portion 4300 is arranged around the connecting portion 2220 and is arranged apart from the connecting portion 2220 along a direction perpendicular to the first direction X to avoid the third sealing portion 4300 from being broken when clamped by the first clamping member 2100 and the second clamping member 2200.

[0059] Specifically, the value of G can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm or 0.35mm. When the value of G is larger, the gap between the third sealing portion 4300 and the connecting portion 2220 is larger, and the third sealing portion 4300 has a larger space for elastic deformation along the direction perpendicular to the first direction X, and is less likely to be broken. When the value of G is smaller, the sealing path of the third sealing portion 4300 is longer, and the sealing effect of the third sealing portion 4300 is better. When the value of G is within the range defined in the embodiments of the present application, the third sealing portion 4300 is less likely to be broken, and at the same time, has a better sealing effect.

[0060] In the above embodiments, the third sealing portion 4300 is arranged apart from the connecting portion 2220 to provide a space for elastic deformation of the third sealing portion 4300 along the direction perpendicular to the first direction X, so as to avoid the third sealing portion 4300 from being broken when pressed by the first clamping member 2100 and the second clamping member 2200. Meanwhile, the above embodiments also limit the range of G to maintain a good sealing performance while avoiding the third sealing portion 4300 from being broken.

[0061] In some embodiments, please refer to Figure 5 Along the first direction X, the clamping portion 2230 and the plate body 1000 have a minimum distance H1 therebetween, and the protruding portion 2240 and the first clamping member 2100 have a minimum distance H2 therebetween, which satisfies: H1≥0.7mm and H2≥0.7mm.

[0062] Specifically, the value of H1 can be 0.7mm, 0.8mm, 0.9mm, 1mm; the value of H2 can be 0.7mm, 0.8mm, 0.9mm, 1mm. When the value of H1 and the value of H2 are larger, the first sealing part 4100 and the third sealing part 4300 are not easy to be extruded to break, and the service life of the sealing piece 4000 is longer. When the value of H1 and the value of H2 are larger, the elastic deformation degree of the first sealing part 4100 and the third sealing part 4300 is larger, and the sealing effect of the first sealing part 4100 and the third sealing part 4300 is better. When the value of H1 and the value of H2 are within the range defined in the embodiments of the present application, the first sealing part 4100 and the third sealing part 4300 can have a longer service life while maintaining a better sealing effect, and are not easy to break.

[0063] In the above embodiments, by limiting the value of H1 and the value of H2, the first sealing part 4100 and the third sealing part 4300 of the sealing piece 4000 can have a longer service life while maintaining a better sealing effect, thereby improving the reliability and service life of the cover plate assembly.

[0064] In some embodiments, along the direction perpendicular to the first direction X, the mounting hole 2210 has a maximum size D, the connecting part 2220 has a maximum size W1, the protruding part 2240 has a maximum size W2, and the clamping part 2230 has a maximum size W3, satisfying: (W1-D) / 2≥2.5mm.

[0065] Specifically, the value of (W1-D) / 2 can be 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm. When the value of (W1-D) / 2 is larger, the area of the first surface 2221 for supporting the first clamping piece 2100 is larger, the connecting area of the first clamping piece 2100 and the second clamping piece 2200 is larger, and the first clamping piece 2100 and the second clamping piece 2200 are not easy to tilt. When the value of (W1-D) / 2 is smaller, the hole diameter of the mounting hole 2210 is larger, the connecting area of the first clamping piece 2100 and the hole wall is larger, the connection between the first clamping piece 2100 and the second clamping piece 2200 is more firm, and the connection reliability is better. When the value of (W1-D) / 2 is within the range defined in the embodiments of the present application, the first clamping piece 2100 and the second clamping piece 2200 are not easy to tilt, and the connection reliability between the first clamping piece 2100 and the second clamping piece 2200 is also better.

[0066] In the above embodiments, by limiting the value of (W1-D) / 2, the connection between the first clamping piece 2100 and the second clamping piece 2200 is more reliable.

[0067] In some embodiments, (W2-W1) / 2≥1.2mm.

[0068] Specifically, the value of (W2-W1) / 2 can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm. When the value of (W2-W1) / 2 is larger, the dimension of the protrusion 2240 along the direction perpendicular to the first direction X is larger, the protrusion 2240 is easier to cooperate with the first clamping piece 2100 to clamp the third sealing part 4300, and the effect of the protrusion 2240 extruding the second sealing part 4200 is better, and the sealing effect of the second sealing part 4200 is also better. When the value of (W2-W1) / 2 is smaller, the second clamping piece 2200 is easier to be arranged in the pole hole 1100, and the assembly difficulty of the cover plate assembly is lower. When the value of (W2-W1) / 2 is within the range defined in the embodiments of the present application, the third sealing part 4300 can be easily clamped, the sealing effect of the second sealing part 4200 is good, and the pole 2000 is also easier to be arranged in the pole hole 1100.

[0069] In the above embodiments, by limiting the value of (W2-W1) / 2, the sealing piece 4000 and the pole 2000 are easy to install, the sealing effect of the sealing piece 4000 is good, and thus the assembly difficulty of the cover plate assembly is lower and the reliability is better.

[0070] In some embodiments, (W3-W2) / 2≥1.2mm.

[0071] Specifically, the value of (W3-W2) / 2 can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm. When the value of (W3-W2) / 2 is larger, the clamping part 2230 can completely cover the first sealing part 4100 after elastic deformation, so that the first sealing part 4100 is tightly attached to the plate body 1000, and the sealing effect of the first sealing part 4100 is better. When the value of (W3-W2) / 2 is smaller, the second clamping piece 2200 uses less material, and the mass of the pole 2000 is lighter. When the value of (W3-W2) / 2 is within the range defined in the embodiments of the present application, the sealing effect of the first sealing part 4100 is guaranteed, and the mass of the pole 2000 is also lighter.

[0072] In the above embodiments, by limiting the value of (W3-W2) / 2, the sealing effect of the sealing piece 4000 is good, and the mass of the pole 2000 is also lighter, so that the cover plate assembly has good reliability and lighter mass.

[0073] In some embodiments, please refer to Figure 5The connecting portion 2220 has a first accommodating groove 2223, the first accommodating groove 2223 is arranged on the second surface 2222, the first accommodating groove 2223 surrounds the mounting hole 2210 and communicates with the mounting hole 2210, the first accommodating groove 2223 has a groove wall 2225, the groove wall 2225 is away from the first surface 2221 along the first direction X, and the first surface 2221 and the groove wall 2225 have a minimum distance T along the first direction X, and the following condition is met: T≥1.2mm.

[0074] Specifically, the value of T can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm. When the value of T is larger, the reliability of the second clamping piece 2200 is better, and deformation is less likely to occur during installation. When the value of T is smaller, the second clamping piece 2200 uses less material, and the mass of the pole 2000 is lighter. When the value of T is within the range defined in the embodiments of the present application, the reliability of the second clamping piece 2200 is better, and the mass of the pole 2000 is lighter.

[0075] In the above embodiments, by limiting the value of T, the reliability of the second clamping piece 2200 is better, and the mass of the pole 2000 is lighter, so that the cover plate assembly has better reliability and lighter mass.

[0076] In some embodiments, referring to Figure 5 The connecting portion 2220 also has a second accommodating groove 2224, the second accommodating groove 2224 is arranged on the second surface 2222, and the second accommodating groove 2224 surrounds the first accommodating groove 2223 and communicates with the first accommodating groove 2223.

[0077] In the above embodiments, the second accommodating groove 2224 makes the second clamping piece 2200 more stable.

[0078] In some embodiments, referring to Figure 7 The protruding portion 2240 has a limiting surface 2241, the limiting surface 2241 extends along a direction perpendicular to the first direction X, the limiting surface 2241 is used to limit the rotation of the pole 2000, and the limiting surface 2241 has a maximum dimension L along a direction perpendicular to the first direction X, and the following condition is met: L≥5mm.

[0079] Specifically, the value of L can be 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, 5.9 mm, 6 mm, 6.1 mm, 6.2 mm, 6.3 mm, 6.4 mm, 6.5 mm, 6.6 mm, 6.7 mm, 6.8 mm, 6.9 mm, or 7 mm. When the value of L is large, the limiting surface 2241 can limit the rotation of the pole column 2000 relative to the plate body 1000 better. When the value of L is small, the radius of the arc transition surface between the two limiting surfaces 2241 is much larger, the stress concentration is less, and the reliability of the pole column 2000 is better. When the value of L is within the range defined in the embodiments of the present application, the limiting effect of the limiting surface 2241 is good, and the reliability of the pole column 2000 is better.

[0080] In the above embodiments, the limiting surface 2241 is provided to indirectly connect the limiting surface 2241 to the plate body 1000 through the sealing element 4000, thereby limiting the rotation of the pole column 2000 relative to the plate body 1000. Meanwhile, the above embodiments limit the range of the value of L to make the pole column 2000 have a good limiting effect and good mechanical properties at the same time.

[0081] In some embodiments, referring to Figure 5 , along the first direction X, the protruding portion 2240 has a maximum size H3, which satisfies: H3-H1≥0.5 mm.

[0082] wherein the value of H3-H1 represents the length of the protruding portion 2240 extending into the pole column hole 1100 along the first direction X.

[0083] Specifically, the value of H3-H1 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. When the value of H3-H1 is large, the length of the protruding portion 2240 extending into the pole column hole 1100 along the first direction X is longer, the projection area of the limiting surface 2241 on the plate body 1000 along a direction perpendicular to the first direction X is larger, and the limiting effect of the limiting surface 2241 on the pole column 2000 is better. When the value of H3-H1 is small, the length of the first clamping element 2100 extending into the pole column hole 1100 along the first direction X is longer, the first clamping element 2100 has a positioning surface 2132 with the same function as the limiting surface 2241, the projection area of the positioning surface 2132 on the plate body 1000 along a direction perpendicular to the first direction X is larger, and the limiting effect of the positioning surface 2132 on the pole column 2000 is better. When the value of H3-H1 is within the range defined in the embodiments of the present application, the first clamping element 2100 and the second clamping element 2200 are less likely to rotate relative to the plate body 1000.

[0084] In the above embodiment, by limiting the range of the value of H3-H1, so that neither the first clamping piece 2100 nor the second clamping piece 2200 is prone to rotating relative to the plate body 1000, rotation of the pole 2000 relative to the plate body 1000 is avoided, and relative rotation between the first clamping piece 2100 and the second clamping piece 2200 is also avoided.

[0085] In some embodiments, referring to Figure 4 、 Figure 9 and Figure 10 , the first clamping piece 2100 includes a limiting portion 2110, a transition portion 2130, and an insertion portion 2120; along the first direction X, the transition portion 2130 is disposed between the limiting portion 2110 and the insertion portion 2120, and is connected to the limiting portion 2110 and the insertion portion 2120, respectively; the limiting portion 2110 is disposed on the side of the plate body 1000 away from the connecting piece 5000 along the first direction X, and a portion of the insulating piece 3000 is disposed between the limiting portion 2110 and the plate body 1000 along the first direction X, and is connected to the limiting portion 2110 and the plate body 1000, respectively; a portion of the transition portion 2130 along the first direction X penetrates the pole hole 1100, and a portion of the sealing piece 4000 is disposed between the transition portion 2130 and the plate body 1000 along a direction perpendicular to the first direction X, and is connected to the transition portion 2130 and the plate body 1000, respectively; the transition portion 2130 is connected to the first surface 2221 along the first direction X; and the insertion portion 2120 penetrates the mounting hole 2210 and is connected to the hole wall of the mounting hole 2210.

[0086] In some embodiments, the limiting portion 2110, the transition portion 2130, and the insertion portion 2120 are integrally formed.

[0087] In some embodiments, referring to Figure 6 、 Figure 9 and Figure 11 , the limiting portion 2110 includes a body 2111 and a protrusion 2112, the protrusion 2112 is connected to the side of the body 2111 facing the second clamping piece 2200 along the first direction X; the transition portion 2130 has a mounting groove 2131 located on the side of the transition portion 2130 close to the limiting portion 2110, and the protrusion 2112 is embedded in the mounting groove 2131, and the body 2111 is connected to the transition portion 2130 along the first direction X.

[0088] In some embodiments, the transition portion 2130 has a positioning surface 2132 extending along a direction perpendicular to the first direction X, and the positioning surface 2132 is indirectly connected to the hole wall of the pole hole 1100 through the sealing piece 4000, so as to limit the rotation of the first clamping piece 2100.

[0089] In some embodiments, referring to Figure 10 and Figure 11The limiting part 2110 is provided with a process groove 2113 along the surface of the second clamping part 2200 in the first direction X, so as to facilitate the molding of the inserting part 2120.

[0090] Accordingly, the application also provides a secondary battery, please refer to Figure 12 and Figure 13 , comprising the cover plate assembly of any one of the above embodiments.

[0091] Please refer 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 a containing cavity 7100, the electrode assembly 6000 is arranged in the containing cavity 7100, the electrode assembly 6000 comprises a main body 6200 and a tab 6100 connected with the main body 6200, the tab 6100 is connected with the connecting piece 5000, the cover plate assembly is connected with the shell 7000 and covers the containing cavity 7100, and the second clamping part 2200 is connected with the connecting piece 5000.

[0092] The above provides a cover plate assembly and a secondary battery provided by the embodiments of the application, the principles and implementation manners of the application are described by applying specific examples in the application, and the above embodiment is only used to help understand the technical solutions and core ideas of the application; the ordinary 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 by equivalents; and the modification or replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A cover plate assembly, characterized in that, include: A plate having a first orientation; The electrode post includes a first clamping member and a second clamping member. A portion of the first clamping member is disposed on one side of the plate along the first direction. A portion of the second clamping member is disposed on the side of the plate away from the first clamping member along the first direction. The portion of the second clamping member passes through the plate. The second clamping member has a mounting hole with an opening facing the first clamping member. A portion of the first clamping member passes through the mounting hole and is connected to the second clamping member. An insulating component, a portion of which is disposed between the first clamping component and the plate body, and respectively connects the first clamping component and the plate body; A sealing element, a portion of which is disposed between the second clamping member and the plate body, and respectively connects the second clamping member and the plate body.

2. The cover plate assembly according to claim 1, characterized in that, The plate has a pole hole, and a portion of the first clamping member passes through the pole hole; the sealing member includes a first sealing portion, which is disposed between a portion of the second clamping member and the plate, and respectively connects the second clamping member and the plate; the second clamping member includes: A connecting portion, which passes through the pole hole, has a first surface and a second surface that are opposite to each other along the first direction, the opening is located on the first surface, and the first surface is connected to the first clamping member. A clamping part is connected to the first sealing part on the side away from the plate body along the first direction, and the clamping part is sleeved on the connecting part.

3. The cover plate assembly according to claim 2, characterized in that, The mounting hole extends through the first surface and the second surface along the first direction.

4. The cover plate assembly according to claim 2, characterized in that, The second clamping member further includes a protrusion, which is sleeved on the connecting part and connected to the clamping part. The protrusion is spaced apart from the first clamping member and passes through the pole hole. The sealing element further includes a second sealing portion, which is connected along the first direction to the side of the first sealing portion away from the clamping portion. The second sealing portion is disposed between the protrusion and the plate in a direction perpendicular to the first direction, and connects the protrusion and the plate respectively.

5. The cover plate assembly according to claim 4, characterized in that, The sealing element further includes a third sealing portion, which is connected to the second sealing portion on the side away from the first sealing portion along the first direction. A portion of the third sealing portion is disposed between the protrusion and the first clamping member along the first direction and is respectively connected to the protrusion and the first clamping member. Wherein, along a direction perpendicular to the first direction, the third sealing part and the connecting part are spaced apart, and the third sealing part and the connecting part have a minimum distance G, satisfying: 0.2mm≤G≤0.35mm.

6. The cover plate assembly according to claim 4, characterized in that, Along a direction perpendicular to the first direction, the mounting hole has a maximum size D, the connecting portion has a maximum size W1, the protrusion has a maximum size W2, and the clamping portion has a maximum size W3, satisfying: / 2≥2.5mm; and / or, / 2≥1.2mm; and / or, / 2≥1.2mm.

7. The cover plate assembly according to claim 2, characterized in that, The connecting part has a first receiving groove, which is disposed on the second surface. The first receiving groove surrounds the mounting hole and communicates with the mounting hole. The first receiving groove has a groove wall, which is opposite to the first surface along the first direction. Along the first direction, there is a minimum distance T between the first surface and the groove wall, which satisfies: T≥1.2mm.

8. The cover plate assembly according to claim 4, characterized in that, The protrusion has a limiting surface that extends in a direction perpendicular to the first direction. The limiting surface is used to restrict the rotation of the pole post. The limiting surface has a maximum dimension L in the direction perpendicular to the first direction, satisfying: L≥5mm.

9. The cover plate assembly according to claim 8, characterized in that, Along the first direction, the clamping part has a minimum distance H1 between itself and the plate, and the protrusion has a minimum distance H2 between itself and the first clamping member, satisfying: H1≥0.7mm and H2≥0.7mm; and / or, along the first direction, the protrusion has a maximum size H3, satisfying: H3-H1≥0.5mm.

10. A secondary battery, characterized in that, Includes the secondary battery as described in any one of claims 1-9.

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