Top cover assembly, battery and assembly method of top cover assembly

Abstract

The embodiment of the invention discloses a top cover assembly, a battery and an assembling method of the top cover assembly, and relates to the technical field of batteries. The top cover assembly comprises a top cover, a pole and upper plastic, the top cover is provided with a pole hole, and the pole comprises a pole body, and a first limiting part and a second limiting part which are positioned at two ends of the pole body; the orthographic projection of the second limiting part on the top cover covers the pole hole; the pole is arranged to rotate between a first position and a second position around the axial direction of the pole hole; at the first position, the orthographic projection of the first limiting part on the top cover is positioned in the pole hole; at the second position, the orthographic projection of the first limiting part on the top cover is partially overlapped with the pole hole; by arranging the first limiting part and the second limiting part, the top cover can be clamped by the first limiting part and the second limiting part, so that the mounting strength of the pole in the pole hole is improved, the upper plastic is added, the mounting strength of the pole in the pole hole is further improved, and the pole can be well fixed in the pole hole even if the upper plastic is aged.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a top cover assembly, a battery and an assembling method of the top cover assembly. Background Art

[0002] In the field of new energy, the top cover of the top cover assembly of the battery is provided with a pole hole, and the pole is fixed in the pole hole by the upper plastic. With the long-term use of the battery, the upper plastic ages and the top cover of the top cover assembly is prone to leakage. Summary of the invention

[0003] Based on this, it is necessary to provide a top cover assembly, a battery and an assembly method of a top cover assembly, aiming to solve the problem that the top cover of the top cover assembly of the battery is provided with a pole hole, and the pole is then fixed in the pole hole by an upper plastic. With the long-term use of the battery, the upper plastic ages, and the top cover of the top cover assembly is prone to leakage.

[0004] In a first aspect, the present invention provides a top cover assembly, comprising: a top cover, a pole and an upper plastic, wherein the top cover is provided with a pole hole, the pole comprises a column, and a first limiting portion and a second limiting portion located at both ends of the column;

[0005] The column is inserted into the pole hole, the first limiting portion and the second limiting portion are respectively placed on the outer side and the inner side of the top cover, and the orthographic projection of the second limiting portion on the top cover covers the pole hole;

[0006] The pole is configured to rotate between a first position and a second position around the axial direction of the pole hole;

[0007] In the first position, the orthographic projection of the first limiting portion on the top cover is located in the pole hole;

[0008] In the second position, the orthographic projection of the first limiting portion on the top cover overlaps with the pole hole portion;

[0009] The upper plastic at least partially fills a gap between the top cover and the pole at the second position.

[0010] In one embodiment, the upper plastic includes a first plastic and a second plastic connected to the first plastic, the first plastic is clamped between the hole wall of the pole hole and the column, and the second plastic is sleeved with the first limiting portion.

[0011] In one embodiment, the column is provided with a first clamping structure, the upper plastic is provided with a second clamping structure, and the first clamping structure is clamped with the second clamping structure.

[0012] In one embodiment, the top cover assembly further includes a lower plastic, and the lower plastic is at least partially clamped between the top cover and the second limiting portion.

[0013] In one of the embodiments, a first protrusion is provided on a side of the lower plastic close to the top cover, a first groove connected to the pole hole is provided on a side of the lower plastic away from the top cover, a second groove connected to the pole hole is provided on a side of the top cover close to the lower plastic, the first protrusion is accommodated in the second groove, and the circumferential outer portion of the second limiting portion is accommodated in the first groove.

[0014] In one embodiment, the top cover assembly also includes a sealing member, the sealing member is provided with a third groove connected to the pole hole, the sealing member is annularly arranged on the column, the circumferential outer side of the sealing member is located in the second groove, is in contact with the lower plastic, and is clamped between the top cover and the second limiting portion, the circumferential inner side of the sealing member is located in the pole hole, and one end of the upper plastic member facing the second limiting portion is accommodated in the third groove, so that the circumferential inner side of the sealing member abuts against the second limiting portion.

[0015] In one embodiment, the pole hole is octagonal, and the first limiting portion is octagonal.

[0016] In one embodiment, the side wall of the column has more than two planes and an arc-shaped connecting surface top cover located between adjacent planes.

[0017] In a second aspect, the present invention further provides a battery, comprising a shell assembly, a battery cell and a top cover assembly of any one of the above embodiments, wherein the shell assembly and the top cover assembly are arranged to form a closed space, and the battery cell is installed in the closed space and is electrically connected to the pole.

[0018] In a third aspect, the present invention further provides a method for assembling a top cover assembly, the method comprising:

[0019] Providing a top cover, wherein the top cover is provided with a pole hole;

[0020] Providing a pole, the pole comprising a column, and a first limiting portion and a second limiting portion located at two ends of the column;

[0021] The column is inserted into the pole hole, the first limiting part and the second limiting part are placed on the outer side and the inner side of the top cover, and the orthographic projection of the second limiting part on the top cover covers the pole hole;

[0022] Rotating the pole, wherein the pole rotates around the axial direction of the pole hole between a first position and a second position;

[0023] In the first position, the orthographic projection of the first limiting portion on the top cover is located in the pole hole;

[0024] In the second position, the orthographic projection of the first limiting portion on the top cover overlaps with the pole hole portion;

[0025] An upper plastic is provided, wherein the upper plastic at least partially fills a gap between the top cover and the pole in the second position.

[0026] Implementing the embodiments of the present invention will have the following beneficial effects:

[0027] The top cover assembly, battery and assembly method of the top cover assembly of the present invention are adopted, the top cover of the top cover assembly is provided with a pole hole, the column is penetrated through the pole hole, the first limiting part and the second limiting part are placed on the outer side and the inner side of the top cover, the positive projection of the second limiting part on the top cover covers the pole hole, the pole is arranged to rotate between a first position and a second position around the axial direction of the pole hole, in the first position, the positive projection of the first limiting part on the top cover is located in the pole hole, so that the first limiting part and the column can penetrate the pole hole, in the second position, the positive projection of the first limiting part on the top cover overlaps with the pole hole part, and the upper plastic At least partially fills the gap between the top cover and the pole in the second position to ensure the seal between the pole and the top cover. The pole rotates in the pole hole so that the positive projection of the first limiting part on the top cover overlaps with the pole hole part, and the positive projection of the second limiting part on the top cover covers the pole hole, so that the first limiting part and the second limiting part can clamp the top cover, so that the pole and the top cover can be snapped together to increase the installation strength of the pole in the pole hole, and increase the upper plastic to further increase the installation strength of the pole in the pole hole. Even if the upper plastic is aged, the pole can be better fixed in the pole hole.

[0028] In addition, the pole and the top cover are assembled by applying plastic, and the pole hole on the top cover cooperates with the column through the plastic, so that the pole can be prevented from rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] in:

[0031] Figure 1 Schematic diagram of an axonometric view of a top cover assembly in one embodiment.

[0032] Figure 2 for Figure 1An exploded schematic diagram of the top cover assembly is shown.

[0033] Figure 3 for Figure 2 A partial enlarged schematic diagram of part A in the top cover assembly shown.

[0034] Figure 4 for Figure 1 A side view of the top cover assembly is shown.

[0035] Figure 5 for Figure 4 A cross-sectional view of the top cover assembly taken along line BB is shown.

[0036] Figure 6 for Figure 5 A partial enlarged schematic diagram of portion C in the top cover assembly shown.

[0037] Reference numerals:

[0038] 1. Top cover; 11. Pole hole; 12. Second groove;

[0039] 2. Pole; 21. Column; 211. Arc-shaped connecting surface; 212. Plane; 22. First limiting portion; 23. Second limiting portion;

[0040] 3. Upper plastic; 31. First plastic; 32. Second plastic; 33. Snap-fit ​​arc surface; 331. Snap-fit ​​surface;

[0041] 4. lower plastic; 41. first protrusion; 42. first groove;

[0042] 5. sealing member; 51. third groove;

[0043] 6. Explosion-proof valve; 7. Liquid injection hole. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0046] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0048] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0049] Please combine Figures 1 to 6 Now, the top cover assembly provided by the present invention is described. The top cover assembly is used in a battery.

[0050] The top cover assembly includes: a top cover 1, a pole 2 and an upper plastic 3. The top cover 1 is provided with a pole hole 11. The pole 2 includes a column 21, and a first limiting portion 22 and a second limiting portion 23 located at both ends of the column 21; the column 21 is penetrated through the pole hole 11, and the first limiting portion 22 and the second limiting portion 23 are respectively placed on the outer side and the inner side of the top cover 1, that is, the first limiting portion 22 is located on the outer side of the top cover 1, and the second limiting portion 23 is located on the inner side of the top cover 1, or the first limiting portion 22 is located on the inner side of the top cover 1, and the second limiting portion 23 is located on the outer side of the top cover 1. The orthographic projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11; the pole 2 is arranged to rotate between a first position and a second position around the axial direction of the pole hole 11; in the first position, the orthographic projection of the first limiting portion 22 on the top cover 1 is located in the pole hole 11, so that the first limiting portion 22 can pass through the pole hole 11; in the second position, the orthographic projection of the first limiting portion 22 on the top cover 1 partially overlaps with the pole hole 11, at which time, the first limiting portion 22 cannot pass through the pole hole 11; the upper plastic 3 at least partially fills the gap between the top cover 1 and the pole 2. Figure 1 As shown, when the pole 2 and the upper plastic 3 are assembled, the first limiting portion 22 is in the second position, referring to Figure 3 At this time, the plane 212 is engaged with the engaging surface 331 , and the arcuate connecting surface 211 is engaged with the engaging arcuate surface 33 . When the first limiting portion 22 is in the first position, the plane 212 is staggered with the engaging surface 331 , and the arcuate connecting surface 211 is staggered with the engaging arcuate surface 33 .

[0051] It can be understood that the top cover 1 of the top cover assembly is provided with a pole hole 11, the column 21 is penetrated in the pole hole 11, the first limiting portion 22 and the second limiting portion 23 are placed on the outer side and the inner side of the top cover 1, the orthographic projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11, and the pole 2 is arranged to rotate between a first position and a second position around the axial direction of the pole hole 11. In the first position, the orthographic projection of the first limiting portion 22 on the top cover 1 is located in the pole hole 11, so that the first limiting portion 22 and the column 21 can penetrate the pole hole 11. In the second position, the orthographic projection of the first limiting portion 22 on the top cover 1 partially overlaps with the pole hole 11, and the upper plastic 3 at least partially fills the top The gap between the cover 1 and the pole 2 in the second position is to ensure the seal between the pole 2 and the top cover 1. The pole 2 rotates in the pole hole 11, so that the positive projection of the first limiting portion 22 on the top cover 1 overlaps with the pole hole 11, and the positive projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11, so that the first limiting portion 22 and the second limiting portion 23 can clamp the top cover 1, so that the pole 2 and the top cover 1 can be snap-fitted, thereby increasing the installation strength of the pole 2 in the pole hole 11, and increasing the upper plastic 3, further increasing the installation strength of the pole 2 in the pole hole 11, even if the upper plastic 3 is aged, the pole 2 can be well fixed in the pole hole 11.

[0052] In addition, the pole 2 and the top cover 1 are assembled by the upper plastic 3 , and the pole hole 11 on the top cover 1 cooperates with the column 21 through the upper plastic 3 , so that the pole 2 can be prevented from rotating.

[0053] It should be noted that the pole hole 11 can be an elliptical or polygonal shape, and the special-shaped structure can limit the rotation of the upper plastic 3 relative to the top cover 1. Specifically, the pole hole 11 is an octagon, and the first limiting portion 22 is an octagon. The first limiting portion 22 and the column 21 penetrate the pole hole 11, so that the first limiting portion 22 is located on the outside of the top cover 1, and the first limiting portion 22 is rotated so that the orthographic projection of the first limiting portion 22 on the top cover 1 overlaps with the pole hole 11. The orthographic projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11, so that the top cover 1 is sandwiched between the first limiting portion 22 and the second limiting portion 23 to increase the fixing strength of the pole 2.

[0054] In one embodiment, if Figures 2 to 6 As shown, the upper plastic 3 includes a first plastic 31 and a second plastic 32 connected to the first plastic 31. The first plastic 31 is clamped between the hole wall of the pole hole 11 and the column 21, and the second plastic 32 is sleeved with the first limiting portion 22. The first plastic 31 and the second plastic 32 can be integrally formed. The first plastic 31 can seal the gap between the hole wall of the pole hole 11 and the column 21. Since the first plastic 31 is fixed between the hole wall of the pole hole 11 and the column 21, the second plastic 32 is sleeved with the first limiting portion 22, so that the first limiting portion 22 will not rotate relative to the top cover 1.

[0055] In this embodiment, the column 21 is provided with a first clamping structure, and the upper plastic 3 is provided with a second clamping structure, and the first clamping structure and the second clamping structure are clamped together. The first clamping structure and the second clamping structure are clamped and connected to limit the rotation of the column 21 relative to the upper plastic 3 around the axis.

[0056] Preferably, the side wall of the column 21 is provided with more than two planes 212 and an arc-shaped connecting surface 211 located between adjacent planes 212. The inner wall of the upper plastic 3 has a snap-fit ​​surface 331 snap-fitted with the plane 212 and a snap-fit ​​arc surface 33 snap-fitted with the arc-shaped connecting surface 211. In the above embodiment, the plane 212 is snap-fitted with the snap-fit ​​331, which can limit the rotation of the column 21 relative to the upper plastic 3. At the same time, the arc-shaped connecting surface 211 facilitates the rotation of the column 21 between the first position and the second position, reducing friction loss during rotation.

[0057] In one embodiment, if Figure 2 and Figure 6 As shown, the top cover assembly further includes a lower plastic 4, which is at least partially clamped between the top cover 1 and the second limiting portion 23. In this way, the lower plastic 4 can further seal the pole hole 11, thereby enhancing the sealing effect of the pole hole 11.

[0058] In this embodiment, a first protrusion 41 is provided on the side of the lower plastic 4 close to the top cover 1, a first groove 42 communicating with the pole hole 11 is provided on the side of the lower plastic 4 away from the top cover 1, a second groove 12 communicating with the pole hole 11 is provided on the side of the top cover 1 close to the lower plastic 4, the first protrusion 41 is accommodated in the second groove 12, and the circumferential outer part of the second limiting portion 23 is accommodated in the first groove 42. In this way, the lower plastic 4 can clamp between the top cover 1 and the second limiting portion 23, thereby achieving sealing between the top cover 1 and the second limiting portion 23. In addition, due to the provision of the first groove 42 and the second groove 12, the contact area between the lower plastic 4 and the top cover 1 is increased, and the contact area between the lower plastic 4 and the second limiting portion 23 is increased, thereby improving the sealing effect.

[0059] In one embodiment, if Figure 2 , Figure 3 and Figure 6As shown, the top cover assembly also includes a seal 5, the seal 5 is provided with a third groove 51 connected to the pole hole 11, the seal 5 is annularly arranged on the column 21, the circumferential outer side of the seal 5 is located in the second groove 12, fits with the lower plastic 4, and is clamped between the top cover 1 and the second limit portion 23, the circumferential inner side of the seal 5 is located in the pole hole 11, and one end of the upper plastic 3 facing the second limit portion 23 is accommodated in the third groove 51, and the circumferential inner side of the seal 5 is abutted against the second limit portion 23. Specifically, the seal 5 is a structural member made of elastic material. The seal 5 can seal the gap between the top cover 1 and the second limit portion 23, and seal the gap between the upper plastic 3 and the second limit portion 23, thereby improving the sealing effect between the pole 2 and the pole hole 11. In addition, due to the provision of the third groove 51, the contact area between the upper plastic 3 and the seal 5 is increased to improve the sealing effect.

[0060] In one embodiment, if Figure 1 As shown, the top cover assembly further includes an explosion-proof valve 6 , which is disposed on the top cover 1 and is used to splash the erupted material inside the top cover 1 .

[0061] In one embodiment, continue as Figure 1 As shown, the top cover 1 is provided with a liquid injection hole 7, and the liquid injection hole 7 is used to inject electrolyte into the top cover 1.

[0062] The present invention also provides a battery, comprising a shell assembly, a battery cell and a top cover assembly of any of the above embodiments, wherein the shell assembly and the top cover assembly are arranged to form a closed space, and the battery cell is installed in the closed space and electrically connected to the pole.

[0063] It can be understood that the battery of the present invention is used for the above-mentioned top cover assembly, so that the top cover 1 of the top cover assembly is provided with a pole hole 11, the column 21 is penetrated in the pole hole 11, the first limiting portion 22 and the second limiting portion 23 are placed on the outer side and the inner side of the top cover 1, and the orthographic projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11, and the pole 2 is arranged to rotate between a first position and a second position around the axial direction of the pole hole 11. In the first position, the orthographic projection of the first limiting portion 22 on the top cover 1 is located in the pole hole 11, so that the first limiting portion 22 and the column 21 can penetrate the pole hole 11. In the second position, the orthographic projection of the first limiting portion 22 on the top cover 1 partially overlaps with the pole hole 11, and the upper plastic 3 at least partially fills the gap between the top cover 1 and the pole 2 in the second position to ensure the seal between the pole 2 and the top cover 1. The pole 2 rotates in the pole hole 11, so that the positive projection of the first limiting portion 22 on the top cover 1 overlaps with the pole hole 11, and the positive projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11, so that the first limiting portion 22 and the second limiting portion 23 can clamp the top cover 1, so that the pole 2 and the top cover 1 can be snap-fitted, thereby increasing the installation strength of the pole 2 in the pole hole 11, and increasing the upper plastic 3, further increasing the installation strength of the pole 2 in the pole hole 11, even if the upper plastic 3 is aged, the pole 2 can be well fixed in the pole hole 11.

[0064] In addition, the pole 2 and the top cover 1 are assembled by the upper plastic 3 , and the pole hole 11 on the top cover 1 cooperates with the column 21 through the upper plastic 3 , so that the pole 2 can be prevented from rotating.

[0065] The present invention also provides a method for assembling a top cover assembly, the method comprising:

[0066] A top cover 1 is provided, and a pole hole 11 is provided on the top cover 1;

[0067] A pole 2 is provided, the pole 2 comprises a column 21, and a first limiting portion 22 and a second limiting portion 23 located at two ends of the column 21;

[0068] The column 21 is inserted into the pole hole 11, and the first limiting portion 22 and the second limiting portion 23 are placed on the outer side and the inner side of the top cover 1, and the orthographic projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11;

[0069] Rotate the pole 2, the pole 2 can rotate around the axial direction of the pole hole 11 between a first position and a second position; in the first position, the orthographic projection of the first limit portion 22 on the top cover 1 is located in the pole hole 11; in the second position, the orthographic projection of the first limit portion 22 on the top cover 1 partially overlaps with the pole hole 11;

[0070] An upper plastic 3 is provided, and the upper plastic 3 at least partially fills the gap between the top cover 1 and the pole 2 at the second position.

[0071] Specifically, S01: install the pole 2 in the pole hole 11 of the top cover 1, and penetrate the first limiting portion 22 and the column 21 into the pole hole 11, with the first limiting portion 22 being placed on the outside of the top cover 1 and the second limiting portion 23 being placed on the inside of the top cover 1;

[0072] S02: Install the upper plastic 3 so that the upper plastic 3 at least partially fills the gap between the top cover 1 and the pole 2;

[0073] S03: Rotate the pole 2, the pole 2 moves from the first position to the second position around the axial direction of the pole hole 11, the orthographic projection of the first limiting portion 22 on the top cover 1 partially overlaps with the pole hole 11, and the orthographic projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11, and the assembly is completed.

[0074] It can be understood that, by adopting the assembly method of the top cover assembly of the invention, the top cover 1 of the top cover assembly is provided with a pole hole 11, the column 21 is penetrated in the pole hole 11, the first limiting portion 22 and the second limiting portion 23 are placed on the outer side and the inner side of the top cover 1, the orthographic projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11, and the pole 2 is arranged to rotate between a first position and a second position around the axial direction of the pole hole 11. In the first position, the orthographic projection of the first limiting portion 22 on the top cover 1 is located in the pole hole 11, so that the first limiting portion 22 and the column 21 can penetrate the pole hole 11. In the second position, the orthographic projection of the first limiting portion 22 on the top cover 1 partially overlaps with .... The plastic 3 at least partially fills the gap between the top cover 1 and the pole 2 in the second position to ensure the seal between the pole 2 and the top cover 1. By rotating the pole 2, the orthographic projection of the first limiting portion 22 on the top cover 1 partially overlaps with the pole hole 11, and the orthographic projection of the second limiting portion 23 on the top cover 1 covers the pole hole 11, so that the first limiting portion 22 and the second limiting portion 23 can clamp the top cover 1, so that the pole 2 and the top cover 1 can be snap-fitted, thereby increasing the installation strength of the pole 2 in the pole hole 11, and increasing the upper plastic 3 to further increase the installation strength of the pole 2 in the pole hole 11. Even if the upper plastic 3 is aged, the pole 2 can be well fixed in the pole hole 11.

[0075] In addition, the pole 2 and the top cover 1 are assembled by the upper plastic 3 , and the pole hole 11 on the top cover 1 cooperates with the column 21 through the upper plastic 3 , so that the pole 2 can be prevented from rotating.

[0076] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A top cover assembly, characterized in that: include: A top cover, a pole and an upper plastic, wherein the top cover is provided with a pole hole, and the pole comprises a column, and a first limiting portion and a second limiting portion located at two ends of the column; The column is inserted into the pole hole, the first limiting portion and the second limiting portion are respectively placed on the outer side and the inner side of the top cover, and the orthographic projection of the second limiting portion on the top cover covers the pole hole; The pole is configured to rotate between a first position and a second position around the axial direction of the pole hole; In the first position, the orthographic projection of the first limiting portion on the top cover is located in the pole hole; In the second position, the orthographic projection of the first limiting portion on the top cover overlaps with the pole hole portion; The upper plastic at least partially fills a gap between the top cover and the pole at the second position.

2. The top cover assembly according to claim 1, characterized in that: The upper plastic includes a first plastic and a second plastic connected to the first plastic, the first plastic is clamped between the hole wall of the pole hole and the column, and the second plastic is sleeved with the first limiting portion.

3. The top cover assembly according to claim 1, characterized in that: The column is provided with a first clamping structure, the upper plastic is provided with a second clamping structure, and the first clamping structure is clamped with the second clamping structure.

4. The top cover assembly according to claim 1, characterized in that: The top cover assembly further includes a lower plastic, and the lower plastic is at least partially clamped between the top cover and the second limiting portion.

5. The top cover assembly according to claim 4, characterized in that: A first protrusion is provided on a side of the lower plastic close to the top cover, a first groove communicating with the pole hole is provided on a side of the lower plastic away from the top cover, a second groove communicating with the pole hole is provided on a side of the top cover close to the lower plastic, the first protrusion is accommodated in the second groove, and the circumferential outer portion of the second limiting portion is accommodated in the first groove.

6. The top cover assembly according to claim 5, characterized in that: The top cover assembly also includes a seal, which is provided with a third groove connected to the pole hole. The seal is annularly arranged on the column, and the circumferential outer side of the seal is located in the second groove, fits with the lower plastic, and is clamped between the top cover and the second limiting portion. The circumferential inner side of the seal is located in the pole hole, and one end of the upper plastic facing the second limiting portion is accommodated in the third groove, so that the circumferential inner side of the seal abuts against the second limiting portion.

7. The top cover assembly according to any one of claims 1 to 6, characterized in that: The pole hole is octagonal, and the first limiting portion is octagonal.

8. The top cover assembly according to any one of claims 1 to 6, characterized in that: The side wall of the column has more than two planes and an arc-shaped connecting surface between adjacent planes.

9. A battery, characterized in that: The battery comprises a shell assembly, a battery cell and a top cover assembly as described in any one of claims 1 to 8, wherein the shell assembly and the top cover assembly are arranged to form a closed space, and the battery cell is installed in the closed space and is electrically connected to the pole.

10. A method for assembling a top cover assembly, characterized in that: The method comprises: Providing a top cover, wherein the top cover is provided with a pole hole; Providing a pole, the pole comprising a column, and a first limiting portion and a second limiting portion located at two ends of the column; The column is inserted into the pole hole, the first limiting part and the second limiting part are placed on the outer side and the inner side of the top cover, and the orthographic projection of the second limiting part on the top cover covers the pole hole; Rotating the pole, wherein the pole rotates around the axial direction of the pole hole between a first position and a second position; In the first position, the orthographic projection of the first limiting portion on the top cover is located in the pole hole; In the second position, the orthographic projection of the first limiting portion on the top cover overlaps with the pole hole portion; An upper plastic is provided, wherein the upper plastic at least partially fills a gap between the top cover and the pole in the second position.

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