Pole fixing structure, top cover assembly and secondary battery

Abstract

The utility model discloses a pole fixing structure, a top cover assembly and a secondary battery, and the pole fixing structure comprises a top cover sheet which is provided with a first mounting hole; the insulating part is arranged on the top cover plate, a second mounting hole is formed in the insulating part, and a first rotation stopping structure is arranged on the upper surface of the insulating part; the polar column is provided with an external thread, and the polar column penetrates through the first mounting hole and the second mounting hole; the riveting block is provided with a third mounting hole, the hole wall of the third mounting hole is provided with an internal thread used for being connected with the external thread, and the lower surface of the riveting block is provided with a second rotation stopping structure used for being matched with the first rotation stopping structure; and the sealing ring is arranged on the pole in a sleeving manner and is mounted at the position of the first mounting hole. The distance between the external thread of the pole and the top of the riveting block is larger than or equal to a first threshold value. According to the fixing mode, welding is not needed, the assembling process is simple, and the stability and reliability of connection can be improved through threaded connection and fixing of the rotation stopping structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of secondary batteries, and particularly relates to a pole post fixing structure, a top cover assembly and a secondary battery. BACKGROUND

[0002] In the technical field of secondary batteries, a secondary battery generally comprises a top cover assembly, which further comprises a pole post and a top cover sheet. Traditionally, the pole post is fixedly connected with the top cover sheet by laser welding technology. However, this laser welding fixing mode has several significant defects:

[0003] Firstly, the heat generated in the laser welding process may pose a potential threat to the insulating layer, and there is a risk of damaging the insulating performance, thereby affecting the overall safety and performance of the battery.

[0004] Secondly, there may be a virtual welding phenomenon in the laser welding process, that is, the welding is not firm, which not only reduces the welding yield, but also seriously affects the reliability of the connection and increases the possibility of battery failure during use.

[0005] Finally, compared with other connection methods, the laser welding technology has more complex process steps, higher requirements for operation precision and cost control, and is not conducive to the improvement of production efficiency.

[0006] In view of the above defects, it has become an important task to be solved in the current technical field of secondary batteries to explore and adopt a new fixing mode to simplify the assembly process of the pole post and the top cover sheet and improve the stability and reliability of the connection. CONTENT OF THE INVENTION

[0007] Therefore, the application provides a pole post fixing structure, a top cover assembly and a secondary battery to solve the above technical problems.

[0008] To achieve the above application purposes, the technical solutions adopted by the application are as follows:

[0009] The first aspect of the embodiment of the application provides a pole post fixing structure, comprising:

[0010] a top cover sheet, the top cover sheet being provided with a first mounting hole;

[0011] an insulating piece, the insulating piece being arranged on the top cover sheet, the insulating piece being provided with a second mounting hole, and an upper surface of the insulating piece being provided with a first rotation-stopping structure;

[0012] a pole post, the pole post being provided with an external thread, and the pole post passing through the first mounting hole and the second mounting hole;

[0013] a riveting block, the riveting block being provided with a third mounting hole, a hole wall of the third mounting hole being provided with an internal thread for connecting the external thread, and a lower surface of the riveting block being provided with a second rotation-stopping structure for cooperating with the first rotation-stopping structure.

[0014] The sealing ring is sleeved on the pole post and installed in the first mounting hole position.

[0015] Optionally, the distance from the outer thread of the pole post to the top of the riveting block is greater than or equal to a first threshold value.

[0016] Optionally, the first threshold value is 5mm.

[0017] Optionally, the upper surface of the top cover sheet is provided with a limiting blind hole, and the lower surface of the insulating piece is provided with a limiting column for inserting into the limiting blind hole.

[0018] Optionally, the insulating piece is a plastic piece.

[0019] The second aspect of the embodiment of the present application provides a top cover assembly comprising the pole post fixing structure described above.

[0020] The third aspect of the embodiment of the present application provides a secondary battery comprising the pole post fixing structure described above or comprising the top cover assembly described above.

[0021] Compared with the prior art, the beneficial effects of the embodiment of the present application are:

[0022] The pole post fixing structure, the top cover assembly and the secondary battery provided by the embodiment of the present application are fixedly connected between the pole post and the top cover sheet through the insulating piece with the first rotation stopping structure and the riveting block with the second rotation stopping structure, and are insulated and sealed by the sealing ring. The fixing mode does not need welding, the assembly process is simple, and through the thread connection and the rotation stopping structure fixing, the stability and reliability of the connection can be improved, and the technical problems existing in the background art can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 A top view of a pole post fixing structure provided by the embodiment of the present application is shown;

[0025] Figure 2 A front view of a pole post fixing structure provided by the embodiment of the present application is shown;

[0026] Figure 3 An enlarged schematic view of the pole post fixing structure A shown is shown; Figure 2

[0027] Figure 4 ​An exploded view of the pole fixing structure is shown. Figure 2 An exploded view of the pole fixing structure is shown.

[0028] Figure 5 An exploded view of the pole fixing structure is shown. Figure 4 An exploded view of the pole fixing structure is shown.

[0029] Figure 6 An exploded view of the pole fixing structure is shown. Figure 4 An exploded view of the pole fixing structure is shown.

[0030] Figure 7 An exploded view of the pole fixing structure is shown. Figure 2 An exploded view of the pole fixing structure is shown.

[0031] Illustration:

[0032] 11, top cover sheet; 111, first mounting hole; 12, pole; 13, explosion-proof valve; 14, external thread; 15, riveting block; 151, third mounting hole; 152, second rotation-stopping structure; 153, internal thread; 16, insulating piece; 161, second mounting hole; 162, first rotation-stopping structure; 17, sealing ring; 18, limiting blind hole; 19, limiting column. DETAILED DESCRIPTION

[0033] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0036] In order to illustrate the technical solutions described in the present application, the following will be described by specific embodiments.

[0037] Please refer to Figures 1 to 7As shown, the embodiment of the present application provides a pole fixing structure, which comprises a top cover sheet 11, an insulating piece 16, a pole 12, a riveting block 15 and a sealing ring 17. The top cover sheet 11 is provided with a first mounting hole 111, the insulating piece 16 is arranged on the top cover sheet 11, the insulating piece 16 is provided with a second mounting hole 161, and the upper surface of the insulating piece 16 is provided with a first rotation-stopping structure 162. The pole 12 is provided with an external thread 14, and the pole 12 passes through the first mounting hole 111 and the second mounting hole 161. The riveting block 15 is provided with a third mounting hole 151, the hole wall of the third mounting hole 151 is provided with an internal thread 153 for connecting the external thread 14, and the lower surface of the riveting block 15 is provided with a second rotation-stopping structure 152 for cooperating with the first rotation-stopping structure 162. The sealing ring 17 is sleeved on the pole 12 and is arranged at the position of the first mounting hole 111. The cooperation between the first rotation-stopping structure 162 and the second rotation-stopping structure 152 can prevent the wire from slipping.

[0038] The pole fixing structure is fixedly connected between the pole 12 and the top cover sheet 11 through the insulating piece 16 with the first rotation-stopping structure 162 and the riveting block 15 with the second rotation-stopping structure 152, and is insulated and sealed through the sealing ring 17. The fixing mode does not need welding, the assembly process is simple, and the stability and reliability of the connection can be improved through the thread connection and the rotation-stopping structure fixing, and the technical problems existing in the background art can be solved.

[0039] In some embodiments, the distance between the external thread 14 of the pole 12 and the top of the riveting block 15 is greater than or equal to a first threshold value, so as to facilitate the connection of the pole 12 with an external device. In this way, when the pole 12 needs to be connected with the external device, the external thread 14 can be fixedly connected with a nut, so as to reduce the welding process. For example, the external device is connected with the external thread 14 through a nut. For example, the external thread 14 can pass through a gasket and then be connected to the external device (such as another secondary battery) through a nut. As an example, the first threshold value is 5 mm.

[0040] In some embodiments, the upper surface of the top cover sheet 11 is provided with a limiting blind hole 18, and the lower surface of the insulating piece 16 is provided with a limiting column 19 for being inserted into the limiting blind hole 18. In this way, the rotation of the insulating piece 16 on the top cover sheet 11 can be avoided. The number of the limiting blind hole 18 is not limited in the embodiment of the present application, for example, it can be one or more.

[0041] In some embodiments, the insulating piece 16 is a plastic piece. As an example, the lower surface of the top cover sheet 11 is further provided with a lower plastic.

[0042] The embodiment of the present application further provides a top cover assembly comprising the above-mentioned pole fixing structure. As an example, the top cover assembly can further comprise an explosion-proof valve 13 mounted on the top cover sheet 11. As an example, the above-mentioned pole fixing structure can be used to fix a positive pole or a negative pole.

[0043] The embodiment of the present application further provides a secondary battery comprising the above-mentioned pole fixing structure or the above-mentioned top cover assembly. As an example, the secondary battery is a lithium ion battery. As an example, the secondary battery further comprises a battery housing, and the top cover assembly and the battery housing are connected to form the secondary battery.

[0044] The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, rather than limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A pole post fixing structure, characterized in that, include: Top cover plate, wherein the top cover plate has a first mounting hole; An insulating component is disposed on the top cover plate, the insulating component is provided with a second mounting hole, and the upper surface of the insulating component is provided with a first anti-rotation structure; The electrode post is provided with external threads and passes through the first mounting hole and the second mounting hole; The riveting block has a third mounting hole, the wall of the third mounting hole has an internal thread for connecting the external thread, and the lower surface of the riveting block has a second anti-rotation structure for cooperating with the first anti-rotation structure. A sealing ring is fitted onto the pole post and installed at the first mounting hole position.

2. The pole post fixing structure according to claim 1, characterized in that, The distance between the external thread of the pole and the top of the rivet block is greater than or equal to a first threshold.

3. The pole post fixing structure according to claim 2, characterized in that, The first threshold is 5 mm.

4. The pole post fixing structure according to claim 1, characterized in that, The upper surface of the top cover plate has a limiting blind hole, and the lower surface of the insulating member is provided with a limiting post for insertion into the limiting blind hole.

5. The pole post fixing structure according to claim 1, characterized in that, The insulating component is made of plastic.

6. A top cover assembly, characterized in that, Includes a pole fixing structure as described in any one of claims 1 to 5.

7. A secondary battery, characterized in that, It includes a pole fixing structure as described in any one of claims 1 to 5 or a top cover assembly as described in claim 6.

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