Integrated top cover sheet, top cover assembly, secondary battery and manufacturing method

Abstract

The invention discloses an integrated top cover piece, a top cover assembly, a secondary battery and a manufacturing method, the integrated top cover piece comprises a top cover piece, the top cover piece is provided with a through hole for mounting a pole, the outer side of the through hole of the top cover piece is convexly provided with an enclosing wall structure around the through hole, and the top of the enclosing wall structure extends to form a barb structure; the top cover sheet, the enclosing wall structure and the barb structure are integrally formed, and the following relational expressions are established: R1 is more than R0 and less than R2; wherein R0 is the aperture of the through hole, R1 is the maximum outer diameter of the pole, and R2 is the middle aperture of the barb structure. According to the integrated top cover piece, the top cover assembly, the secondary battery and the manufacturing method provided by the embodiment of the invention, the top cover piece, the enclosing wall structure and the barb structure which are integrally formed are arranged, and R1 is more than R0 and less than R2, so that the cost can be reduced, the manufacturing efficiency can be improved, and the structural stability of the assembled top cover assembly and the secondary battery can be improved through the barb structure.

Description

Technical Field

[0001] The present application belongs to the technical field of secondary batteries, and in particular relates to an integrated top cover sheet, a top cover assembly, a secondary battery and a manufacturing method. Background Art

[0002] In the current market, in order to improve the utilization rate of the lithium battery shell space, the common practice is to design and assemble electrode components such as electrode pressure plates and insulating rings on the top of the top cover sheet to reduce the space occupied by the lower shell. The traditional sealing structure between the top cover sheet and each electrode assembly mostly relies on a combination of welding technology and high-strength plastic parts. This method not only requires extremely high assembly precision and complex production processes, which increases production difficulty and cost, but also when faced with large changes in operating temperature, the sealing structure is prone to deformation or even rupture due to thermal expansion and contraction, resulting in potential leakage risks in the battery shell, and its safety and reliability still need to be further improved.

[0003] To solve the above problems, the Chinese invention patent with publication number CN114497839A discloses an integrated lithium battery top cover sheet. The edge of the electrode through hole is integrally formed with a convex annular clamping ring. During production and assembly, the annular clamping ring can be turned inward to press the electrode components such as the insulating ring, electrode pressing plate and sealing gasket into the electrode through hole for sealing without any welding. This not only simplifies the assembly process and improves production efficiency, but also the deformation and scaling of the sealing structure is very small even when the operating temperature changes drastically, and there is no risk of rupture and leakage, and the safety and reliability of the sealing structure is greatly improved.

[0004] However, despite the many advantages brought by the above technologies, in practical applications, their manufacturing costs are still relatively high, which has become a major bottleneck restricting the widespread promotion and application of this technology. Therefore, it is necessary to further explore new solutions to reduce costs and improve manufacturing efficiency while maintaining the advantages of existing technologies. Summary of the invention

[0005] One of the purposes of the present application is to provide an integrated top cover sheet, a top cover assembly, a secondary battery and a manufacturing method for reducing costs and improving manufacturing efficiency.

[0006] In order to achieve the above application purpose, the technical solution adopted in this application is as follows:

[0007] The embodiment of the present application provides an integrated top cover sheet, including a top cover sheet, the top cover sheet is provided with a through hole for installing a pole, a wall structure is protruded around the through hole on the outer side of the through hole of the top cover sheet, a barb structure extends from the top of the wall structure, the top cover sheet, the wall structure, and the barb structure are integrally formed, and the following relationship holds: R0<R1<R2;

[0008] Among them, R0 is the aperture of the through hole, R1 is the maximum outer diameter of the pole, and R2 is the middle aperture of the barb structure.

[0009] In some embodiments, the surface of the wall structure and / or the barb structure is provided with an anti-rotation boss or an anti-rotation groove.

[0010] In some embodiments, the top cover sheet is provided with a support surface for placing a sealing ring on the inner side of the wall structure.

[0011] In some embodiments, a step structure for connecting the lower plastic is also provided on the inner side of the support surface.

[0012] An embodiment of the present application provides a top cover assembly, including the above-mentioned integrated top cover sheet, sealing ring and pole, and the integrated top cover sheet, sealing ring and pole are fixed by filling with plastic.

[0013] An embodiment of the present application provides a secondary battery, comprising the above-mentioned integrated top cover sheet.

[0014] The present invention provides a method for manufacturing a top cover assembly, comprising the following steps:

[0015] The one-piece top cover sheet is manufactured by using an one-piece molding process;

[0016] Place the sealing ring and the pole into the enclosure structure in sequence;

[0017] Plastic is filled between the integrated top cover sheet, the sealing ring and the pole to achieve fixation.

[0018] Compared with the prior art, the beneficial effects of the embodiments of the present application are:

[0019] The integrated top cover sheet, top cover assembly, secondary battery and manufacturing method provided in the embodiments of the present application can not only reduce costs and improve manufacturing efficiency by setting an integrally formed top cover sheet, a wall structure, and a barb structure, and R0<R1<R2, but also improve the structural stability of the assembled top cover assembly and secondary battery through the barb structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of an integrated top cover sheet provided in an embodiment of the present application is shown;

[0022] Figure 2 Shows Figure 1 The enlarged schematic diagram of point A in the middle;

[0023] Figure 3 Shows Figure 1 A top view of

[0024] Figure 4 Shows Figure 3 AA section view;

[0025] Figure 5 Shows Figure 4 The enlarged schematic diagram of point B in the middle;

[0026] Figure 6 An exploded view of a top cover assembly provided in an embodiment of the present application is shown;

[0027] Figure 7 A cross-sectional view of a top cover assembly provided in an embodiment of the present application is shown.

[0028] Illustration Description:

[0029] 10. Integrated top cover plate; 11. Top cover plate; 111. Through hole; 112. Support surface; 113. Step structure; 12. Wall structure; 121. Anti-rotation boss; 13. Barb structure; 20. Sealing ring; 30. Pole; 40. Upper plastic; 50. Lower plastic. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] 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.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

[0034] See also Figures 1 to 7 As shown, an embodiment of the present application provides an integrated top cover sheet 10, including a top cover sheet 11, the top cover sheet 11 is provided with a through hole 111 for installing the pole 30, the outer side of the through hole of the top cover sheet 11 is protruded with a wall structure 12 around the through hole 111, and a barb structure 13 extends from the top of the wall structure 12. The top cover sheet 11, the wall structure 12, and the barb structure 13 are integrally formed, and the following relationship holds: R0<R1<R2; wherein R0 is the aperture of the through hole 111, R1 is the maximum outer diameter of the pole 30, and R2 is the middle aperture of the barb structure 13.

[0035] In this way, when assembling the top cover assembly, the pole 30 can be placed into the enclosure structure 12 through the top cover sheet 11, thereby improving manufacturing efficiency and reducing costs.

[0036] In some embodiments, the surface of the wall structure 12 and / or the barb structure 13 is provided with an anti-rotation boss 121 or an anti-rotation groove. For example, during subsequent injection molding or pouring of the upper plastic 40, the upper plastic 40 forms a snap connection at the position of the anti-rotation boss 121 or the anti-rotation groove, thereby preventing the upper plastic 40 from rotating.

[0037] In some embodiments, on the inner side of the wall structure 12 , the top cover sheet 11 is provided with a supporting surface 112 for placing the sealing ring 20 .

[0038] In some embodiments, a step structure 113 for connecting the lower plastic 50 is further provided on the inner side of the support surface 112 .

[0039] The embodiment of the present application further provides a top cover assembly, including the above-mentioned integrated top cover sheet 10 , the sealing ring 20 and the pole 30 , and the integrated top cover sheet 10 , the sealing ring 20 and the pole 30 are fixed by filling plastic 40 .

[0040] As an example, the upper plastic 40 may also extend to the outer side of the wall structure 12, for example Figure 7 shown.

[0041] The embodiment of the present application further provides a secondary battery, comprising the above-mentioned integrated top cover sheet 10. For example, the secondary battery is a lithium-ion battery.

[0042] The present application also provides a method for manufacturing a top cover assembly, comprising the following steps:

[0043] S10, using an integrated molding process to manufacture the integrated top cover sheet 10 as described above;

[0044] S20, placing the sealing ring 20 and the pole 30 into the wall structure 12 in sequence;

[0045] S30, filling the space between the integrated top cover sheet 10, the sealing ring 20 and the pole 30 with plastic 40 to achieve fixation.

[0046] The above-mentioned integrated top cover sheet 10, top cover assembly, secondary battery and manufacturing method, by providing an integrally formed top cover sheet 11, a wall structure 12, and a hook structure 13, and limiting the size relationship between the aperture of the through hole 111, the maximum outer diameter of the pole 30 and the middle aperture of the hook structure 13, can not only reduce costs and improve manufacturing efficiency, but also improve the structural stability of the assembled top cover assembly and secondary battery through the hook structure 13.

[0047] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An integrated top cover sheet, characterized in that: The top cover sheet comprises a through hole for installing a pole, a wall structure is protruded around the through hole on the outer side of the through hole of the top cover sheet, a barb structure extends from the top of the wall structure, the top cover sheet, the wall structure and the barb structure are integrally formed, and the following relationship holds: R0<R1<R2; Among them, R0 is the aperture of the through hole, R1 is the maximum outer diameter of the pole, and R2 is the middle aperture of the barb structure.

2. The integrated top cover sheet according to claim 1, characterized in that: The surface of the wall structure and / or the barb structure is provided with an anti-rotation boss or an anti-rotation groove.

3. The integrated top cover sheet according to claim 1, characterized in that: On the inner side of the enclosure structure, the top cover sheet is provided with a supporting surface for placing a sealing ring.

4. The integrated top cover sheet according to claim 3, characterized in that: A step structure for connecting the lower plastic is also provided on the inner side of the support surface.

5. A top cover assembly, characterized in that: It comprises the integrated top cover sheet, the sealing ring and the pole according to any one of claims 1 to 4, wherein the integrated top cover sheet, the sealing ring and the pole are fixed by filling with plastic.

6. A secondary battery, characterized in that: The invention comprises the integrated top cover sheet as described in any one of claims 1 to 4.

7. A method for manufacturing a top cover assembly, characterized in that: include: An integrated top cover sheet as claimed in any one of claims 1 to 4 is manufactured by an integrated molding process; Put the sealing ring and the pole into the enclosure structure in sequence; Plastic is filled between the integrated top cover sheet, the sealing ring and the pole to achieve fixation.

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