Top cover structure and battery

Abstract

The utility model relates to a top cover structure and a battery. Relates to the technical field of new energy batteries. The cover plate specifically comprises a cover plate main body and a pole assembly mounted on the cover plate main body, a mounting hole is formed in the cover plate main body, and the pole assembly is mounted in the mounting hole; a first limiting boss is arranged on the inner wall of the mounting hole, a first limiting groove is formed in the periphery of the pole assembly, and when the pole assembly is mounted in the mounting hole, the first limiting boss is matched with the first limiting groove in an inserted mode. According to the utility model, the first limiting boss is arranged on the inner wall of the mounting hole, and when the pole assembly is fixedly mounted in the mounting hole, the rotation of the pole assembly along the axis direction is limited through the matching of the first limiting boss and the first limiting groove, so that the torsion resistance of the pole assembly after being mounted on the cover plate main body is enhanced; therefore, the stability of the top cover structure is enhanced and the performance of the power lithium battery is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a top cover structure and a battery. Background Art

[0002] Lithium batteries, due to their high specific energy, high operating voltage, long cycle life, and environmentally friendly properties, have been widely used in new energy vehicles, energy storage, and other fields. With market development, power lithium batteries are gradually moving towards high energy density, high rate performance, and high safety performance. Power lithium batteries generally adopt a square hard shell structure. The outer shell consists of a box body and a top cover. The top cover seals the box body, and the positive and negative electrodes of the box are connected through the poles installed on the top cover, thus realizing the charging and discharging functions of the power lithium battery. Therefore, the stability of the top cover structure has a significant impact on the performance of the power lithium battery.

[0003] The top cover of existing power lithium batteries typically uses riveting to secure the poles. This involves pressing the poles against the top cover with a rivet edge, which is then welded to secure the poles to the top cover. Because the rivet edge presses the poles against the top cover, it only limits vertical displacement and has little effect on limiting axial rotation. Consequently, the poles' torsional resistance is poor, leading to poor stability in the top cover structure and impacting the performance of the power lithium battery. Utility Model Content

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and provide a top cover structure and a battery, which can enhance the torsional resistance of the pole after being installed on the top cover structure, thereby enhancing the stability of the top cover structure and ensuring the performance of the power lithium battery.

[0005] The utility model proposes a top cover structure, including a cover body and a pole assembly installed on the cover body, the cover body is provided with a mounting hole, and the pole assembly is installed in the mounting hole; the inner wall of the mounting hole is provided with a first limiting boss, and the outer periphery of the pole assembly is provided with a first limiting groove, when the pole assembly is installed in the mounting hole, the first limiting boss and the first limiting groove are plugged into and matched with each other.

[0006] Furthermore, the pole assembly includes a column and an upper plastic ring sleeved on the outside of the column. When the column is installed in the mounting hole, the upper plastic ring is used to limit the column, and the first limiting groove is provided on the outer periphery of the upper plastic ring.

[0007] Furthermore, the inner wall of the upper plastic ring is provided with a second limiting boss, and the outer periphery of the column is provided with a second limiting groove. When the upper plastic ring limits the column, the second limiting boss is plugged into and fits with the second limiting groove.

[0008] Furthermore, the top cover structure also includes a sealing ring arranged between the pole assembly and the mounting hole. When the pole assembly is installed in the mounting hole, the sealing ring is pressed into the mounting hole. The sealing ring is used to seal the gap between the pole assembly and the mounting hole.

[0009] Furthermore, the top cover structure further comprises a welding cover fixedly connected to the cover plate body, and when the pole assembly is installed in the mounting hole, the welding cover fixes the pole assembly in the mounting hole.

[0010] Furthermore, the mounting hole includes a first mounting groove and a second mounting groove that are connected to each other, the first mounting groove connects the bottom of the cover body with the outside world, and the second mounting groove connects the top of the cover body with the outside world. When the column is installed in the mounting hole, it passes through the second mounting groove and the first mounting groove in sequence, and the upper plastic ring limits the column in the second mounting groove, and the first limiting boss is arranged on the inner wall of the second mounting groove.

[0011] Furthermore, a first clamping portion is provided on the outer periphery of the column, and a first clamping groove is provided in the upper plastic ring. The first clamping groove cooperates with the first clamping portion to limit the column installed in the mounting hole. The second limiting boss is provided on the inner wall of the first clamping groove, and the second limiting groove is provided on the outer periphery of the first clamping portion.

[0012] Furthermore, a protrusion is provided on the periphery of the mounting hole, a second clamping groove is provided on the periphery of the upper plastic ring, and the welding cover includes a ring portion sleeved on the protrusion, and a second clamping portion cooperating with the second clamping groove.

[0013] Furthermore, the sealing ring includes a first sealing portion and a second sealing portion extending vertically downward on the first sealing portion, the column presses the first sealing portion against the bottom of the second mounting groove, and the second sealing portion is inserted into the first mounting groove.

[0014] The utility model also provides a battery, comprising the above-mentioned top cover structure.

[0015] The top cover structure and battery proposed in this utility model have the following beneficial effects:

[0016] (1) The top cover structure is provided with a first limiting boss on the inner wall of the mounting hole. When the pole assembly is fixedly installed in the mounting hole, the first limiting boss cooperates with the first limiting groove to limit the rotation of the pole assembly along the axial direction, thereby enhancing the torsion resistance of the pole assembly after installation on the cover body, thereby enhancing the stability of the top cover structure and ensuring the performance of the power lithium battery;

[0017] (2) The pole assembly of the top cover structure includes a column and an upper plastic ring. When the pole assembly is fixedly installed on the cover body, the column is first installed on the mounting hole, and then the upper plastic ring is installed in the mounting hole. The upper plastic ring limits the position of the column and presses the column into the mounting hole, thereby achieving fixed installation of the column on the cover body.

[0018] (3) The inner wall of the upper plastic ring of the top cover structure is provided with a second limiting boss, and the outer periphery of the column is provided with a second limiting groove. When the upper plastic ring is installed in the mounting hole, the second limiting boss cooperates with the second limiting groove to limit the rotation of the column along the axial direction, thereby enhancing the torsion resistance of the pole assembly after installation on the cover body and ensuring the stability of the top cover structure;

[0019] (4) When the top cover structure is installing the upper plastic ring, the first limiting boss on the inner wall of the installation hole is plugged into the first limiting groove on the outer periphery of the upper plastic ring, and the second limiting boss on the inner wall of the upper plastic ring is engaged with the second limiting groove on the outer periphery of the column, thereby performing multiple limiting operations on the rotation of the pole assembly along the axial direction through multiple sets of limiting structures, further enhancing the torsion resistance of the pole assembly after installation on the cover body, and ensuring the stability of the top cover structure;

[0020] (5) The top cover structure also includes a sealing ring, which is located between the pole assembly and the mounting hole. Through the elastic deformation ability of the sealing ring, the pole assembly can be installed more tightly on the mounting hole, thereby enhancing the stability of the top cover structure, and the gap between the pole assembly and the mounting hole can be sealed, thereby enhancing the sealing of the top cover structure and thus ensuring the performance of the power lithium battery;

[0021] (6) A raised portion is provided on the periphery of the mounting hole of the top cover structure. When the welding cover is fixedly connected to the cover plate body, the collar portion is sleeved on the raised portion, which can not only guide the position of the welding cover, thereby making the assembly of the top cover structure easier to achieve, but also enhance the strength of the welding cover fixed to the cover plate body, thereby enhancing the stability of the top cover structure and ensuring the performance of the power lithium battery;

[0022] (7) The sealing ring of the top cover structure includes a first sealing part and a second sealing part. The first sealing part seals the gap between the column and the first mounting groove, and the second sealing part seals the gap between the column and the second mounting groove, thereby making the sealing of the top cover structure better and further ensuring the performance of the power lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present utility model and, together with the description, serve to explain the principles of the present utility model. In the accompanying drawings, like reference numerals are used to represent like elements.

[0024] Figure 1 This is an exploded view of the assembly of a top cover structure and a battery according to an embodiment of the present utility model;

[0025] Figure 2 A schematic cross-sectional view of a top cover structure and a battery according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic structural diagram of a top cover structure and a battery cover body according to an embodiment of the present utility model;

[0027] Figure 4 This is a schematic structural diagram of a top cover structure and a battery column according to an embodiment of the present utility model;

[0028] Figure 5 This is a schematic structural diagram of a top cover structure and an upper plastic ring of a battery according to an embodiment of the utility model;

[0029] Figure 6 This is a schematic structural diagram of a top cover structure and a battery sealing ring according to an embodiment of the present utility model;

[0030] Figure 7 This is a schematic structural diagram of a top cover structure and a welding cover of a battery according to an embodiment of the present utility model.

[0031] In the figure: 1. Cover plate body; 11. Mounting hole; 111. First mounting groove; 112. Second mounting groove; 12. First limiting boss; 13. Raised portion; 2. Column; 21. Second limiting groove; 22. First clamping portion; 3. Upper plastic ring; 31. First limiting groove; 32. First clamping groove; 321. Second limiting boss; 33. Second clamping groove; 4. Sealing ring; 41. First sealing portion; 42. Second sealing portion; 5. Welding cover; 51. Ring portion; 52. Second clamping portion. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 7A top cover structure of an embodiment of the present invention includes a cover body 1 and a pole assembly installed on the cover body 1. The cover body 1 is provided with a mounting hole 11, and the pole assembly is installed in the mounting hole 11; the inner wall of the mounting hole 11 is provided with a first limiting boss 12, and the outer periphery of the pole assembly is provided with a first limiting groove 31. When the pole assembly is installed in the mounting hole 11, the first limiting boss 12 is plugged into and matched with the first limiting groove 31.

[0034] In this patent, the top cover structure includes a cover body 1 and a pole assembly. A mounting hole 11 is provided on the cover body 1, and the pole assembly is fixedly installed in the mounting hole 11. Therefore, when the cover body 1 seals the battery box, the positive and negative poles of the battery are led out through the pole assembly to realize the charging and discharging function of the battery.

[0035] In the top cover structure, the inner wall of the mounting hole 11 is provided with a first limiting boss 12, and the outer periphery of the pole assembly is provided with a first limiting groove 31. When the pole assembly is fixedly installed in the mounting hole 11, the first limiting boss 12 is plugged into and fitted with the first limiting groove 31.

[0036] By cooperating with the first limiting boss 12 and the first limiting groove 31, the rotation of the pole assembly along the axial direction is restricted, thereby enhancing the torsional resistance of the pole assembly after installation on the cover body 1, thereby enhancing the stability of the top cover structure and ensuring the performance of the power lithium battery.

[0037] In this embodiment, the pole assembly includes a column 2 and an upper plastic ring 3 sleeved on the outside of the column 2. When the column 2 is installed in the mounting hole 11, the upper plastic ring 3 is used to limit the position of the column 2, and the first limiting groove 31 is provided on the outer circumference of the upper plastic ring 3. In this patent, the pole assembly includes the column 2 and the upper plastic ring 3. When the pole assembly is fixedly installed on the cover body 1, the column 2 is first installed on the mounting hole 11, and then the upper plastic ring 3 is installed in the mounting hole 11, so that the column 2 is limited by the upper plastic ring 3 and the column 2 is pressed tightly in the mounting hole 11, thereby achieving the fixed installation of the column 2 on the cover body 1.

[0038] Since in this top cover structure, the first limiting groove 31 is arranged on the outer periphery of the upper plastic ring 3, when the upper plastic ring 3 is installed on the mounting hole 11, the first limiting boss 12 on the inner wall of the mounting hole 11 is plugged into and matched with the first limiting groove on the outer periphery of the upper plastic ring 3, so that the movement of the upper plastic ring 3 along the axial direction is limited by the cooperation between the first limiting boss 12 and the first limiting groove, and then the column 2 is limited by the upper plastic ring 3, limiting the vertical displacement of the column 2, and at the same time limiting the rotation of the column 2 in the axial direction, thereby enhancing the torsion resistance of the pole assembly after installation on the cover plate body 1 and ensuring the stability of the top cover structure.

[0039] Specifically, in this embodiment, the inner wall of the upper plastic ring 3 is provided with a second limiting boss 321, and the outer periphery of the column 2 is provided with a second limiting groove 21. When the upper plastic ring 3 is installed in the mounting hole 11, the first limiting boss 12 on the inner wall of the mounting hole 11 is plugged into and matched with the first limiting groove 31 on the outer periphery of the upper plastic ring 3, and the second limiting boss 321 on the inner wall of the upper plastic ring 3 is plugged into and matched with the second limiting groove 21 on the outer periphery of the column 2.

[0040] Therefore, the upper plastic ring 3 installed in the mounting hole 11 presses the column 2 in the mounting hole 11, limiting the vertical displacement of the column 2. At the same time, through the cooperation between the first limiting boss 12 and the first limiting groove 31, and the cooperation between the second limiting boss 321 and the second limiting groove 21, the rotation of the upper plastic ring 3 and the column 2 along the axial direction is limited, thereby enhancing the torsion resistance of the pole assembly after installation on the cover body 1 and ensuring the stability of the top cover structure.

[0041] In this embodiment, the top cover structure also includes a sealing ring 4 provided between the pole assembly and the mounting hole 11. When the pole assembly is installed in the mounting hole 11, the sealing ring 4 is pressed tightly into the mounting hole 11. The sealing ring 4 is used to seal the gap between the pole assembly and the mounting hole 11.

[0042] In this patent, the top cover structure also includes a sealing ring 4. When the pole assembly is fixedly installed on the cover body 1, the sealing ring 4 is first installed in the mounting hole 11, and then the pole assembly is installed on the mounting hole 11, so that the sealing ring 4 is located between the pole assembly and the mounting hole 11.

[0043] In this patent, the sealing ring 4 is made of a flexible material and is installed between the pole assembly and the mounting hole 11. On the one hand, when the pole assembly is pressed against the mounting hole 11, the elastic deformation ability of the sealing ring 4 can make the pole assembly more firmly installed on the mounting hole 11, thereby enhancing the stability of the top cover structure.

[0044] On the other hand, the sealing ring 4 located between the pole assembly and the mounting hole 11 can seal the gap between the pole assembly and the mounting hole 11, thereby improving the sealing performance of the top cover structure and further ensuring the performance of the power lithium battery. In actual implementation, the sealing ring 4 can be made of rubber material.

[0045] In this embodiment, the top cover structure further includes a welding cover 5. After the pole assembly is installed in the mounting hole 11, the welding cover 5 is fixedly connected to the cover plate body 1. The welding cover 5 limits the position of the pole assembly and presses the pole assembly into the mounting hole 11, thereby achieving fixed installation of the pole assembly on the cover plate body 1. Specifically, in actual implementation, the welding cover 5 can be fixedly connected to the cover plate body 1 by welding.

[0046] Therefore, in this patent, the assembly of the top cover structure includes the following steps: first, install the sealing ring 4 in the mounting hole 11, then install the column 2 on the mounting hole 11, so that the column 2 presses the sealing ring 4, and the bottom of the column 2 passes through the mounting hole 11, and then install the upper plastic ring 3 in the mounting hole 11, so that the upper plastic ring 3 presses the column 2, and finally fix the welding cover 5 to the cover plate body 1, so that the welding cover 5 presses the upper plastic ring 3, thereby realizing the fixation of the upper plastic ring 3, the column 2 and the sealing ring 4 in the mounting hole 11, and completing the assembly of the top cover structure.

[0047] In this embodiment, the mounting hole 11 includes a first mounting groove 111 and a second mounting groove 112 which are connected to each other. The first mounting groove 111 connects the bottom of the cover body 1 with the outside world, and the second mounting groove 112 connects the top of the cover body 1 with the outside world. When the column 2 is installed in the mounting hole 11, it passes through the second mounting groove 112 and the first mounting groove 111 in sequence. The upper plastic ring 3 limits the column 2 in the second mounting groove 112, and the first limiting boss 12 is arranged on the inner wall of the second mounting groove 112.

[0048] In this patent, the mounting hole 11 includes a first mounting groove 111 and a second mounting groove 112, and the first mounting groove 111 and the second mounting groove 112 are connected to each other, wherein the first mounting groove 111 connects the bottom of the cover body 1 with the outside world, and the second mounting groove 112 connects the top of the cover body 1 with the outside world, so the first mounting groove 111 and the second mounting groove 112 pass through the cover body 1.

[0049] Because the cross-sectional area of ​​the second mounting groove 112 is larger than that of the first mounting groove 111, the first mounting groove 111 and the second mounting groove 112 form a stepped structure. When installing the sealing ring 4 in the mounting hole 11, the sealing ring 4 is installed from the top of the cover body 1 to the bottom of the second mounting groove 112. When installing the column 2 in the mounting hole 11, the column 2 is inserted into the mounting hole 11 from the top of the cover body 1, so that the bottom of the column 2 passes through the second mounting groove 112 and the first mounting groove 111 in sequence, until the middle of the column 2 abuts against the sealing ring 4, thereby pressing the sealing ring 4 tightly.

[0050] The first limiting boss 12 is arranged on the inner wall of the second mounting groove 112. When the upper plastic ring 3 is installed in the mounting hole 11, the upper plastic ring 3 is installed in the second mounting groove 112 from the top of the cover body 1 until the upper plastic ring 3 abuts against the middle of the column 2, thereby pressing the column 2.

[0051] At the same time, the first limiting boss 12 on the inner wall of the second mounting groove 112 is plugged into and matched with the first limiting groove 31 on the outer periphery of the upper plastic ring 3, and the second limiting boss 321 on the inner wall of the upper plastic ring 3 is plugged into and matched with the second limiting groove 21 on the outer periphery of the column 2, thereby limiting the rotation of the upper plastic ring 3 and the column 2 along the axial direction, thereby enhancing the torsional resistance of the pole assembly after installation on the cover plate body 1, and ensuring the stability of the top cover structure.

[0052] In this embodiment, a first clamping portion 22 is provided on the outer periphery of the column 2, and a first clamping groove 32 is provided in the upper plastic ring 3. The first clamping groove 32 cooperates with the first clamping portion 22 to limit the column 2 installed in the mounting hole 11. The second limiting boss 321 is provided on the inner wall of the first clamping groove 32, and the second limiting groove 21 is provided on the outer periphery of the first clamping portion 22.

[0053] In this patent, a first pressing portion 22 is provided on the outer periphery of the middle portion of the column 2. When the column 2 is inserted into the mounting hole 11 from the top of the cover body 1, the bottom of the column 2 sequentially passes through the second mounting groove 112 and the first mounting groove 111 until the bottom of the first pressing portion 22 of the column 2 abuts against the sealing ring 4, thereby pressing the sealing ring 4. A first pressing groove 32 is provided in the upper plastic ring 3. When the upper plastic ring 3 is installed in the second mounting groove 112, the first pressing groove 32 of the upper plastic ring 3 cooperates with the first pressing portion 22 of the column 2, so that the upper plastic ring 3 presses the column 2 into the mounting hole 11.

[0054] Since the second limiting boss 321 is provided on the inner wall of the first clamping groove 32, and the second limiting groove 21 is provided on the outer periphery of the first clamping portion 22, when the first clamping groove 32 cooperates with the first clamping portion 22, the second limiting boss 321 is plugged into and cooperated with the second limiting groove 21, so that the upper plastic ring 3 limits both the vertical displacement of the column 2 and the rotation of the column 2 along the axial direction, thereby enhancing the stability of the top cover structure and ensuring the performance of the power lithium battery.

[0055] In this embodiment, a raised portion 13 is provided on the outer periphery of the mounting hole 11, a second pressing groove 33 is provided on the outer periphery of the upper plastic ring 3, and the welding cover 5 includes a collar portion 51 sleeved on the raised portion 13, and a second pressing portion 52 that cooperates with the second pressing groove 33. In this patent, the raised portion 13 and the cover body 1 are an integrated structure. Specifically, in actual implementation, the raised portion 13 can be formed by stamping the cover body 1, thereby enhancing the structural strength of the cover body 1.

[0056] In this patent, the welding cover 5 includes a collar portion 51, and a raised portion 13 is provided on the outer periphery of the mounting hole 11. When the welding cover 5 is fixedly connected to the cover plate body 1, the collar portion 51 is first placed on the raised portion 13, and then the welding cover 5 and the cover plate body 1 are welded. The cooperation between the collar portion 51 and the raised portion 13 can guide the position of the welding cover 5 when welding the welding cover 5 to the cover plate body 1, thereby making the assembly of the top cover structure easier to achieve.

[0057] On the other hand, since the raised portion 13 and the cover plate body 1 are an integrated structure, the ring portion 51 is sleeved on the raised portion 13, which can enhance the strength of the welding cover 5 fixed to the cover plate body 1, thereby enhancing the stability of the top cover structure and ensuring the performance of the power lithium battery.

[0058] In this patent, the welding cover 5 further includes a second pressing portion 52, and a second pressing groove 33 is provided on the outer periphery of the upper plastic ring 3. When the collar portion 51 of the welding cover 5 is sleeved on the raised portion 13, the second pressing portion 52 is plugged into and matched with the second pressing groove 33. Thus, after the welding cover 5 is welded to the cover plate body 1, the second pressing portion 52 is engaged with the second pressing groove 33, so that the second pressing portion 52 presses the upper plastic ring 3 into the mounting hole 11, thereby completing the assembly of the top cover structure.

[0059] In this embodiment, the sealing ring 4 includes a first sealing portion 41 and a second sealing portion 42 extending vertically downward from the first sealing portion 41. The column 2 presses the first sealing portion 41 against the bottom of the second mounting groove 112, and the second sealing portion 42 is inserted into the first mounting groove 111.

[0060] In this patent, the sealing ring 4 includes a first sealing portion 41 and a second sealing portion 42. The second sealing portion 42 extends vertically downward from the bottom of the first sealing portion 41. When the sealing ring 4 is installed in the mounting hole 11, the first sealing portion 41 abuts against the bottom of the second mounting groove 112, and the first sealing portion 41 is inserted into the first mounting groove 111. When the column 2 is installed in the mounting hole 11, the first pressing portion 22 of the column 2 abuts against the first sealing portion 41, thereby pressing the sealing ring 4 into the mounting hole 11.

[0061] When the bottom of the column 2 passes through the first mounting groove 111, the first sealing portion 41 surrounds the outside of the column 2, thereby sealing the gap between the column 2 and the first mounting groove 111 through the first sealing portion 41, and the second sealing portion 42 seals the gap between the column 2 and the second mounting groove 112, thereby making the sealing of the top cover structure better and further ensuring the performance of the power lithium battery.

[0062] An embodiment of the present invention further provides a battery, comprising the above-mentioned top cover structure.

[0063] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the scope of protection of the present invention.

[0064] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0065] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A top cover structure, characterized in that: The invention comprises a cover plate body (1), and a pole assembly mounted on the cover plate body (1); the cover plate body (1) is provided with a mounting hole (11), and the pole assembly is mounted in the mounting hole (11); the inner wall of the mounting hole (11) is provided with a first limiting boss (12), and the outer periphery of the pole assembly is provided with a first limiting groove (31); when the pole assembly is mounted in the mounting hole (11), the first limiting boss (12) and the first limiting groove (31) are plugged and matched; The pole assembly comprises a column (2) and an upper plastic ring (3) sleeved on the outside of the column (2); when the column (2) is installed in the mounting hole (11), the upper plastic ring (3) is used to limit the position of the column (2); the first limiting groove (31) is provided on the outer periphery of the upper plastic ring (3); The top cover structure further comprises a welding cover (5) fixedly connected to the cover plate body (1); when the pole assembly is installed in the mounting hole (11), the welding cover (5) fixes the pole assembly in the mounting hole (11); A protrusion (13) is provided on the outer periphery of the mounting hole (11), a second pressing groove (33) is provided on the outer periphery of the upper plastic ring (3), and the welding cover (5) includes a collar portion (51) sleeved on the protrusion (13), and a second pressing portion (52) cooperating with the second pressing groove (33).

2. A roof structure as claimed in claim 1, characterized in that: The inner wall of the upper plastic ring (3) is provided with a second limiting boss (321), and the outer periphery of the column (2) is provided with a second limiting groove (21). When the upper plastic ring (3) limits the column (2), the second limiting boss (321) is plugged into and matched with the second limiting groove (21).

3. A roof structure as claimed in claim 2, characterized in that: The top cover structure further comprises a sealing ring (4) provided between the pole assembly and the mounting hole (11); when the pole assembly is mounted in the mounting hole (11), the sealing ring (4) is pressed tightly into the mounting hole (11); the sealing ring (4) is used to seal the gap between the pole assembly and the mounting hole (11).

4. A roof structure as claimed in claim 3, characterized in that: The mounting hole (11) comprises a first mounting groove (111) and a second mounting groove (112) which are connected to each other. The first mounting groove (111) connects the bottom of the cover plate body (1) with the outside world, and the second mounting groove (112) connects the top of the cover plate body (1) with the outside world. When the column (2) is installed in the mounting hole (11), it passes through the second mounting groove (112) and the first mounting groove (111) in sequence. The upper plastic ring (3) limits the column (2) in the second mounting groove (112). The first limiting boss (12) is provided on the inner wall of the second mounting groove (112).

5. A roof structure as claimed in claim 4, characterized in that: A first pressing portion (22) is provided on the outer periphery of the column (2), and a first pressing groove (32) is provided in the upper plastic ring (3). The first pressing groove (32) cooperates with the first pressing portion (22) to limit the column (2) installed in the mounting hole (11), and the second limiting boss (321) is provided on the inner wall of the first pressing groove (32), and the second limiting groove (21) is provided on the outer periphery of the first pressing portion (22).

6. A roof structure as claimed in claim 4, characterized in that: The sealing ring (4) comprises a first sealing portion (41) and a second sealing portion (42) extending vertically downward from the first sealing portion (41); the column (2) presses the first sealing portion (41) against the bottom of the second mounting groove (112); and the second sealing portion (42) is inserted into the first mounting groove (111).

7. A battery, characterized in that: The invention comprises a top cover structure according to any one of claims 1 to 6.

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