Top cover assembly and battery

Abstract

The invention discloses a top cover assembly and a battery, the top cover assembly comprises a top cover sheet, a pole, a first insulating part and a sealing part, and the top cover sheet is provided with a through hole; the pole penetrates through the through hole; the first insulating part is used for insulation between the pole and the hole wall of the through hole; the sealing piece is used for sealing between the pole and the hole wall of the through hole; wherein the first insulating parts and the sealing parts are arranged in a staggered manner; according to the top cover assembly provided by the embodiment of the invention, the first insulating parts and the sealing parts are arranged in the staggered manner, so that the creepage distance between the top cover plate and the pole column can be increased, the insulating property between the pole column and the top cover plate is improved, and due to the cooperation between the first insulating parts and the sealing parts, the creepage distance between the pole column and the top cover plate is increased. And the insulating property and the sealing property of the pole and other parts are also ensured, and the insulating effect is met.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and more particularly to a top cover assembly and a battery. Background Technology

[0002] As the power sources for power tools and new energy vehicles increasingly focus on higher capacity and safety, secondary batteries, with their high capacity and other excellent characteristics, are widely used in power tools and new energy vehicles. However, existing top cover components often require high DC voltage, which can lead to unstable insulation and poor battery voltage during use. Summary of the Invention

[0003] This application provides a top cover assembly and a battery to at least partially solve the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, a top cover assembly is provided, comprising a top cover sheet, a terminal post, a first insulating member, and a sealing member. The top cover sheet has a through hole; the terminal post passes through the through hole; a portion of the first insulating member is located on the side of the top cover sheet away from the battery cell, and at least a portion of the first insulating member extends into the hole wall of the through hole for insulation between the terminal post and the hole wall of the through hole; and at least a portion of the sealing member is disposed between the terminal post and the hole wall of the through hole for sealing between the terminal post and the hole wall of the through hole; wherein the first insulating member and the sealing member are staggered.

[0005] In some embodiments, the top cover assembly further includes a second insulating member, a portion of which is disposed on the side of the top cover sheet near the battery cell, and a portion of which extends into the through hole for insulation between the electrode post and the through hole.

[0006] In some embodiments, the first insulating member includes a first insulating body and a first insulating protrusion, the first insulating protrusion being disposed on the side of the first insulating body near the battery cell along the axial direction of the electrode post; the sealing member includes a first sealing body and a first sealing protrusion, the first sealing protrusion being disposed on the side of the first sealing body away from the battery cell along the axial direction of the electrode post; wherein the first insulating protrusion and the first sealing protrusion are alternately arranged.

[0007] In some embodiments, the first insulating protrusion is disposed around the pole post, and the first sealing protrusion is disposed around the outer peripheral side of the first insulating protrusion, such that the first insulating protrusion is sandwiched between the first sealing protrusion and the pole post; or, the first sealing protrusion is disposed around the pole post, and the first insulating protrusion is disposed around the outer peripheral side of the first sealing protrusion, such that the first sealing protrusion is sandwiched between the first insulating protrusion and the pole post.

[0008] In some embodiments, the first insulating member includes a second insulating body and a second insulating protrusion, the second insulating protrusion being disposed on the side of the second insulating body near the pole post along the radial direction of the pole post; the sealing member includes a second sealing body and a second sealing protrusion, the second sealing protrusion being disposed on the side of the second sealing body away from the pole post along the radial direction of the pole post; wherein the second insulating protrusion and the second sealing protrusion are staggered.

[0009] In some embodiments, the first insulating member includes a first sub-insulator and a second sub-insulator, a portion of the first sub-insulator is located on the side of the top cover sheet away from the battery cell, and a portion of the first sub-insulator extends into the wall of the through hole; the second sub-insulator is located in the through hole and disposed between the seal and the first sub-insulator.

[0010] In some embodiments, the first sub-insulator and the second sub-insulator are arranged alternately.

[0011] In some embodiments, the first sub-insulator includes a first sub-insulator body and a first sub-insulator protrusion, the first sub-insulator protrusion being disposed on the side of the first sub-insulator body near the battery cell along the axial direction of the electrode post; the second sub-insulator includes a second sub-insulator body and a second sub-insulator protrusion, the second sub-insulator protrusion being disposed on the side of the first sub-insulator body away from the battery cell along the axial direction of the electrode post; wherein the first sub-insulator protrusion and the second sub-insulator protrusion are staggered.

[0012] In some embodiments, the second sub-insulator further includes a connecting portion along the axial direction of the pole post, the connecting portion being connected to one end of the second sub-insulator protrusion away from the battery cell, and the connecting portion being sandwiched between the first sub-insulator body and the pole post.

[0013] In some embodiments, the top cover sheet has an extension at one end away from the battery cell, the extension surrounding the outer periphery of the electrode post; the extension has an injection position for injection molding to form the first insulating member or the sealing member.

[0014] In some embodiments, the extension is provided with one or more vent holes along the axial direction of the extension for discharging gases formed during injection molding.

[0015] In some embodiments, at least one of the vent holes is opposite to the glue injection position.

[0016] In the top cover assembly of this application embodiment, since the first insulating member and the sealing member are staggered, the creepage distance between the top cover plate and the pole can be increased, thereby improving the insulation performance between the pole and the top cover plate. Furthermore, due to the cooperation between the first insulating member and the sealing member, the insulation and sealing performance between the pole and the other components are also guaranteed, thus satisfying the insulation effect.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0019] Figure 1 This is a schematic diagram of the structure of the top cover assembly provided in an exemplary embodiment of this disclosure; Figure 2 This is a partially enlarged view of the first structure of the top cover assembly; Figure 3 This is a magnified view of a portion of the second structure of the top cover assembly; Figure 4 This is a magnified view of a portion of the third structure of the top cover assembly; Figure 5 This is a schematic diagram of the structure of the first insulating component; Figure 6 This is a structural diagram of the glue injection location and vent holes; Figure 7 for Figure 6 A magnified view of point A in the image.

[0020] Explanation of reference numerals in the attached figures: 1. Top cover assembly; 11. Top cover plate; 111. Through hole; 112. Extension; 12. Pole post; 13. First insulating component; 131. First insulating body; 132. First insulating protrusion; 133. Second insulating body; 134. Second insulating protrusion; 135. First sub-insulating component; 1351. First sub-insulating body; 1352. First sub-insulating protrusion; 136. Second sub-insulating component; 1361. Second sub-insulating body; 1362. Second sub-insulating protrusion; 1363. Connecting part; 14. Seal; 141. First sealing body; 142. First sealing protrusion; 143. Second sealing body; 144. Second sealing protrusion; 15. Second insulating component; 16. Vent. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0022] As the power sources for power tools and new energy vehicles increasingly develop towards higher capacity and higher safety, secondary batteries, with their high capacity and other excellent characteristics, are widely used in power tools and new energy vehicles. However, existing top cover components often require high DC voltage, which can lead to unstable insulation and poor battery voltage during use.

[0023] This application provides a top cover assembly 1, please refer to... Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the top cover assembly 1 provided in an embodiment of this application.

[0024] A top cover assembly 1 includes a top cover plate 11, a terminal post 12, a first insulating member 13, and a sealing member 14. The top cover plate 11 has a through hole 111; the terminal post 12 passes through the through hole 111; a portion of the first insulating member 13 is located on the side of the top cover plate 11 away from the battery cell, and at least a portion of the first insulating member 13 extends into the hole wall of the through hole 111 for insulation between the terminal post 12 and the hole wall of the through hole 111; and at least a portion of the sealing member 14 is disposed between the terminal post 12 and the hole wall of the through hole 111 for sealing between the terminal post 12 and the hole wall of the through hole 111; wherein the first insulating member 13 and the sealing member 14 are staggered.

[0025] In the top cover assembly 1 of this application embodiment, since the first insulating member 13 and the sealing member 14 are staggered, the creepage distance between the top cover plate 11 and the pole post 12 can be increased, thereby improving the insulation performance between the pole post 12 and the top cover plate 11. Furthermore, due to the cooperation between the first insulating member 13 and the sealing member 14, the insulation and sealing performance between the pole post 12 and the other components are also guaranteed, thus satisfying the insulation effect.

[0026] In some embodiments, the top cover assembly 1 further includes a second insulating member 15, a portion of which is disposed on the side of the top cover sheet 11 near the battery cell, and a portion of which extends into the through hole 111 for insulation between the pole post 12 and the through hole 111.

[0027] It is understood that, in this embodiment, by setting the second insulating member 15, insulation can be achieved between the pole post 12 and the side of the top cover plate 11 near the battery cell. Furthermore, since part of the second insulating member 15 extends into the through hole 111, the second insulating member 15 can be set on the outer periphery of the pole post 12, thereby achieving a better insulation effect.

[0028] In this embodiment, along the radial direction of the pole post 12, the seal 14 is located outside the second insulating member 15, which facilitates the installation and positioning of the seal 14.

[0029] During assembly, the pole post 12 is first fixed on the top cover plate 11, then the first insulating component 13 and the second insulating component 15 are connected between the pole post 12 and the top cover plate 11, and finally the sealing ring is filled into the space between the pole post 12 and the top cover plate 11 to seal it.

[0030] In some embodiments, refer to Figure 2 and Figure 3 As shown, the first insulating member 13 includes a first insulating body 131 and a first insulating protrusion 132. Along the axial direction of the pole post 12, the first insulating protrusion 132 protrudes from the first insulating body 131 on the side close to the battery cell. The sealing member 14 includes a first sealing body 141 and a first sealing protrusion 142. Along the axial direction of the pole post 12, the first sealing protrusion 142 protrudes from the first sealing body 141 on the side away from the battery cell. The first insulating protrusion 132 and the first sealing protrusion 142 are arranged alternately.

[0031] Thus, a tortuous creepage distance can be formed between the first insulating protrusion 132 and the first sealing protrusion 142. Compared with a completely horizontal contact, the staggered arrangement of the first insulating protrusion 132 and the first sealing protrusion 142 can increase the creepage distance between the pole post 12 and the top cover plate 11, thereby ensuring the insulation performance between the pole post 12 and the top cover plate 11.

[0032] Furthermore, since the first insulating protrusion 132 and the first sealing protrusion 142 interlock in the axial direction to achieve a misalignment effect, the first insulating member 13 and the sealing member 14 can provide better support in the axial direction, making the first insulating member 13 and the sealing member 14 more stable under axial force.

[0033] Thus, the first insulating protrusion 132 and the first sealing protrusion 142, which are arranged axially, enable the first insulating member 13 and the sealing member 14 to support each other in the axial direction, thereby fixing the pole post 12 and preventing the pole post 12 from shifting or running during use. In addition, it can also increase the creepage distance between the pole post 12 and the top cover plate 11, thereby avoiding short circuit between the pole post 12 and the top cover plate 11.

[0034] In some embodiments, refer to Figure 2 and Figure 3 As shown, the first insulating protrusion 132 is disposed around the pole post 12, and the first sealing protrusion 142 is disposed around the outer periphery of the first insulating protrusion 132, so that the first insulating protrusion 132 is sandwiched between the first sealing protrusion 142 and the pole post 12; or, the first sealing protrusion 142 is disposed around the pole post 12, and the first insulating protrusion 132 is disposed around the outer periphery of the first sealing protrusion 142, so that the first sealing protrusion 142 is sandwiched between the first insulating protrusion 132 and the pole post 12.

[0035] In other words, in the specific implementation process, along the radial direction of the pole post 12, the first insulating protrusion 132 can be disposed on the outer side of the first sealing protrusion 142, or the first insulating protrusion 132 can be disposed on the inner side of the first sealing protrusion 142. Regardless of whether the first insulating protrusion 132 is disposed on the outer side or the inner side, the creepage distance between the pole post 12 and the top cover plate 11 can be increased, thereby ensuring the insulation between the pole post 12 and the top cover plate 11. During assembly, the seal 14 is first assembled onto the pole post 12, then the pole post 12 is assembled onto the top cover plate 11, and finally the first insulating part 13 is formed by injection molding. It can be understood that when the first insulating protrusion 132 is located on the outside of the first sealing protrusion 142, the seal 14 can better wrap around the pole post 12, thereby making the positioning effect of the seal 14 better and ensuring the assembly effect of the seal 14.

[0036] In some embodiments, refer to Figure 4As shown, the first insulating member 13 includes a second insulating body 133 and a second insulating protrusion 134. Along the radial direction of the pole post 12, the second insulating protrusion 134 protrudes from the side of the second insulating body 133 near the pole post 12. The sealing member 14 includes a second sealing body 143 and a second sealing protrusion 144. Along the radial direction of the pole post 12, the second sealing protrusion 144 protrudes from the side of the second sealing body 143 away from the pole post 12. The second insulating protrusion 134 and the second sealing protrusion 144 are arranged alternately.

[0037] Thus, a creepage distance with a curved path can be formed between the second insulating protrusion 134 and the second sealing protrusion 144. Compared with a completely horizontal contact, the staggered arrangement between the second insulating protrusion 134 and the second sealing protrusion 144 can increase the creepage distance between the pole post 12 and the top cover plate 11, thereby ensuring the insulation performance between the pole post 12 and the top cover plate 11.

[0038] Furthermore, the radially arranged second insulating protrusion 134 and second sealing protrusion 144 can be adapted to smaller spaces without occupying a long axial space, achieving a larger creepage distance within a limited space, and minimizing the overall size of the equipment while ensuring electrical insulation performance, thereby improving the integration and portability of the equipment.

[0039] In some embodiments, refer to Figure 5 As shown, the first insulating member 13 includes a first sub-insulator 135 and a second sub-insulator 136. A portion of the first sub-insulator 135 is located on the side of the top cover plate 11 away from the battery cell, and a portion of the first sub-insulator 135 extends into the wall of the through hole 111. The second sub-insulator 136 is located in the through hole 111 and is disposed between the sealing member 14 and the first sub-insulator 135.

[0040] Thus, dividing the first insulating member 13 into two parts, the first sub-insulating member 135 and the second sub-insulating member 136, makes the structure of the first insulating member 13 more reasonable and the degree of cooperation between it and the top cover plate 11 is higher, thereby improving the overall structural strength of the top cover assembly 1.

[0041] It is understood that, in this embodiment, since the first insulating member 13 includes a first sub-insulating member 135 and a second sub-insulating member 136, during the injection molding process of the first insulating member 13, the second sub-insulating member 136 can be injection molded first, followed by the first sub-insulating member 135. This avoids the possibility of incomplete injection molding due to the large overall thickness, and better ensures the insulation performance of the first insulating member 13.

[0042] In some embodiments, the first sub-insulator 135 and the second sub-insulator 136 are arranged alternately.

[0043] Thus, the staggered arrangement of the first sub-insulator 135 and the second sub-insulator 136 increases the creepage distance between the first sub-insulator 135 and the second sub-insulator, preventing the electrode post 12 from conducting with the top cover plate 11.

[0044] Thus, the staggered arrangement of the first sub-insulator 135 and the second sub-insulator 136 can also ensure the connection between the first sub-insulator 135 and the second sub-insulator 136, making the fit between the first sub-insulator 135 and the second sub-insulator 136 even better.

[0045] In some embodiments, the first sub-insulator 135 includes a first sub-insulator body 1351 and a first sub-insulator protrusion 1352. Along the axial direction of the pole post 12, the first sub-insulator protrusion 1352 protrudes from the side of the first sub-insulator body 1351 close to the battery cell. The second sub-insulator 136 includes a second sub-insulator body 1361 and a second sub-insulator protrusion 1362. Along the axial direction of the pole post 12, the second sub-insulator protrusion 1362 protrudes from the side of the first sub-insulator body 1351 away from the battery cell. The first sub-insulator protrusion 1352 and the second sub-insulator protrusion 1362 are arranged alternately.

[0046] In this way, a creepage distance with a curved path can be formed between the first sub-insulating protrusion 1352 and the second sub-insulating protrusion 1362. Compared with a completely horizontal contact, the staggered arrangement between the first sub-insulating member 135 and the second sub-insulating member 136 can increase the creepage distance between the pole post 12 and the top cover plate 11, thereby ensuring the insulation performance between the pole post 12 and the top cover plate 11.

[0047] It should also be noted that, in this embodiment, reference is made to... Figure 4 and Figure 5 As shown, the first sub-insulating protrusion 1352 and the second sub-insulating protrusion 1362 are axially intersected, while the second insulating protrusion 134 and the second sealing protrusion 144 are radially intersected.

[0048] Thus, by designing an interlocking structure in both the axial and radial directions, the pole post 12 can be better limited in both the axial and radial directions, so that the pole post 12 is firmly fixed on the top cover plate 11, and the pole post 12 can better resist forces in multiple directions, ensuring the stability and reliability of the seal 14 and the first insulating member 13.

[0049] Furthermore, without significantly increasing the volume of the top cover assembly 1, higher insulation performance of the pole post 12 can be achieved using limited internal space.

[0050] Furthermore, by designing an interlocking structure in both the axial and radial directions, the first insulating element 13 and the sealing element 14 can more effectively cope with thermal expansion or mechanical deformation, reducing the risk of sealing and insulation failure due to dimensional changes.

[0051] In some embodiments, the second sub-insulator 136 further includes a connecting portion 1363, which is connected to the end of the second sub-insulator protrusion 1362 away from the battery cell along the axial direction of the pole post 12, and the connecting portion 1363 is sandwiched between the first sub-insulator body 1351 and the pole post 12.

[0052] In this way, the second sub-insulator 136 can wrap around the outer periphery of the pole post 12, ensuring a stable connection between the second sub-insulator 136 and the pole post 12.

[0053] In some embodiments, refer to Figure 6 As shown, the top cover plate 11 has an extension 112 at the end away from the battery cell, and the extension 112 surrounds the outer periphery of the electrode post 12; the extension 112 has an injection position, which is used for injection molding to form the first insulating part 13 or the sealing part 14.

[0054] Thus, by providing the extension 112, it is possible to better surround the pole post 12 while increasing the overall thickness of the top cover plate 11, thereby achieving a better connection between the pole post 12 and the top cover plate 11.

[0055] Furthermore, the injection point can be used to inject the first insulating element 13 or the sealing element 14, thereby forming a good sealing and insulation effect between the top cover plate 11 and the pole post 12.

[0056] In this way, the placement of the glue injection point can effectively prevent external moisture, air or other impurities from entering the battery, while also preventing electrolyte leakage and improving battery safety and reliability.

[0057] It should also be noted that, such as Figure 7 As shown at point B, the glue injection position is set directly above the top cover plate 11; however, this design is not limited to this, and in other embodiments, glue can also be injected on the side of the top cover plate 11.

[0058] In some embodiments, the extension 112 is provided with one or more vent holes 16 along the axial direction of the extension 112, the vent holes 16 being used to discharge the gas formed during injection molding.

[0059] During the glue injection process, the injection of glue will compress air into the corners or gaps inside the top cover plate 11, forming trapped air. The vent 16 can release this air in time to prevent the formation of air bubbles.

[0060] Thus, the vent 16 effectively solves the problem of trapped air caused by the existing injection molding process. The gas can be directly discharged through the vent 16, which can also effectively achieve close contact between the first insulating part 13 and the sealing part 14. After the battery is assembled, the battery voltage can remain stable, and insulation and long-term safety can be guaranteed under different working conditions.

[0061] In some embodiments, refer to Figure 6 and Figure 7 As shown, at least one vent hole 16 is opposite to the glue injection position.

[0062] In this way, the relatively positioned vent 16 and glue injection position can ensure smooth airflow, allowing trapped air to be quickly discharged, thereby improving the efficiency of glue injection.

[0063] Thus, the relatively positioned vent 16 and glue injection position ensure that the glue can evenly cover the gap between the top cover 11 and the battery casing during the glue injection process. After the glue injection is completed, the glue cures to form a seal 14 and a first insulating element 13, effectively preventing external moisture, air or other impurities from entering the battery, while also preventing electrolyte leakage from inside the battery, thereby improving the battery's sealing performance.

[0064] In summary, in the top cover assembly 1 of this application, since the first insulating member 13 and the sealing member 14 are arranged in an alternating manner, a tortuous creepage line can be formed between the pole post 12 and the top cover plate 11, which increases the shortest path length between the pole post 12 and the top cover plate 11, effectively preventing electrical continuity between the top cover plate 11 and the pole post 12, thereby ensuring the insulation performance between the top cover plate 11 and the pole post 12.

[0065] According to a second aspect of this disclosure, a battery is provided that includes the top cover assembly 1 described above. This battery possesses all the beneficial effects of the top cover assembly 1, which will not be elaborated further herein.

[0066] The battery of this application may be in the form of a battery cell, a battery module, or a battery pack. In some embodiments, battery cells may be assembled into a battery module, and the number of battery cells contained in a battery module may be one or more, the specific number of which can be selected by those skilled in the art based on the application and capacity of the battery module. In some embodiments, battery modules may also be assembled into a battery pack, and the number of battery modules contained in a battery pack may be one or more, the specific number of which can be selected by those skilled in the art based on the application and capacity of the battery pack.

[0067] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0068] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0069] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0070] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A top cover assembly (1), characterized in that, include: Top cover plate (11), the top cover plate (11) is provided with a through hole (111). The pole (12) is inserted through the through hole (111). A first insulating element (13), a portion of which is located on the side of the top cover plate (11) away from the battery cell, and at least a portion of which extends into the wall of the through hole (111) for insulation between the pole post (12) and the wall of the through hole (111); and, A seal (14), at least a portion of which is disposed between the pole post (12) and the hole wall of the through hole (111) for sealing the hole wall between the pole post (12) and the through hole (111); The first insulating element (13) and the sealing element (14) are arranged alternately.

2. The top cover assembly (1) according to claim 1, characterized in that, The top cover assembly (1) further includes a second insulating member (15), a portion of which is disposed on the side of the top cover sheet (11) near the battery cell, and a portion of which extends into the through hole (111) for insulation between the pole post (12) and the through hole (111).

3. The top cover assembly (1) according to claim 1, characterized in that, The first insulating element (13) includes: First insulating body (131); and, The first insulating protrusion (132) protrudes along the axial direction of the pole post (12) and is located on the side of the first insulating body (131) near the battery cell. The seal (14) includes: First sealing body (141); and, The first sealing protrusion (142) is located along the axial direction of the pole post (12) and protrudes from the side of the first sealing body (141) away from the battery cell. The first insulating protrusion (132) and the first sealing protrusion (142) are arranged alternately.

4. The top cover assembly (1) according to claim 3, characterized in that, The first insulating protrusion (132) is disposed around the pole post (12), and the first sealing protrusion (142) is disposed around the outer periphery of the first insulating protrusion (132), such that the first insulating protrusion (132) is sandwiched between the first sealing protrusion (142) and the pole post (12); or, the first sealing protrusion (142) is disposed around the pole post (12), and the first insulating protrusion (132) is disposed around the outer periphery of the first sealing protrusion (142), such that the first sealing protrusion (142) is sandwiched between the first insulating protrusion (132) and the pole post (12).

5. The top cover assembly (1) according to claim 1, characterized in that, The first insulating element (13) includes: Second insulating body (133); and, The second insulating protrusion (134) is provided on the side of the second insulating body (133) near the pole post (12) along the radial direction of the pole post (12); The seal (14) includes: Second sealing body (143); and, The second sealing protrusion (144) is located radially from the pole post (12) and protrudes from the side of the second sealing body (143) away from the pole post (12). The second insulating protrusion (134) and the second sealing protrusion (144) are arranged alternately.

6. The top cover assembly (1) according to claim 5, characterized in that, The first insulating element (13) includes: The first sub-insulator (135), a portion of which is located on the side of the top cover plate (11) away from the battery cell, and a portion of which extends into the wall of the through hole (111); and, The second sub-insulator (136) is located inside the through hole (111) and is disposed between the seal (14) and the first sub-insulator (135).

7. The top cover assembly (1) according to claim 6, characterized in that, The first sub-insulator (135) and the second sub-insulator (136) are arranged alternately.

8. The top cover assembly (1) according to claim 7, characterized in that, The first sub-insulator (135) includes: First sub-insulating body (1351); and, The first sub-insulation protrusion (1352) is located along the axial direction of the pole post (12) and protrudes from the first sub-insulation body (1351) on the side close to the battery cell. The second sub-insulator (136) includes: Second sub-insulating body (1361); and, The second sub-insulation protrusion (1362) is located along the axial direction of the pole post (12) and protrudes from the side of the first sub-insulation body (1351) away from the battery cell. The first sub-insulating protrusion (1352) and the second sub-insulating protrusion (1362) are arranged alternately.

9. The top cover assembly (1) according to claim 8, characterized in that, The second sub-insulator (136) further includes a connecting portion (1363) along the axial direction of the pole post (12). The connecting portion (1363) is connected to the end of the second sub-insulator protrusion (1362) away from the battery cell, and the connecting portion (1363) is sandwiched between the first sub-insulator body (1351) and the pole post (12).

10. The top cover assembly (1) according to any one of claims 1-9, characterized in that, The top cover (11) has an extension (112) at one end away from the battery cell, and the extension (112) surrounds the outer periphery of the electrode post (12); The extension (112) is provided with an injection position, which is used for injection molding to form the first insulating part (13) or the sealing part (14).

11. The top cover assembly (1) according to claim 10, characterized in that, Along the axial direction of the extension (112), the extension (112) is provided with one or more vent holes (16) for discharging gas formed during injection molding.

12. The top cover assembly (1) according to claim 11, characterized in that, At least one of the vent holes (16) is opposite to the glue injection position.

13. A battery, characterized in that, Includes the top cover assembly (1) as described in any one of claims 1-12.

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