A positive electrode cover plate assembly and a battery

Abstract

The utility model relates to a battery field provides a kind of positive cover plate assembly and battery.Positive cover plate assembly includes: pole;Riveting block is set between lower plastic and positive connection sheet, the end of the pole is formed with riveting muscle towards the riveting block, connecting surface that the riveting muscle riveting cooperation is formed on the riveting block, along the axial direction of the pole, from the root of the riveting muscle to the end of the riveting muscle, the thickness of the riveting muscle gradually decreases.The utility model discloses positive cover plate assembly and battery by making pole and riveting block form inclined surface connection, reduce riveting difficulty, eliminate stress concentration, improve assembly efficiency and the reliability of battery.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a positive electrode cover plate assembly and a battery. Background Technology

[0002] In the current cylindrical battery production process, the positive electrode cover plate assembly is usually composed of electrode post, riveting block, sealing ring and plastic parts, and the connection between the components is mostly achieved by riveting process.

[0003] However, in actual production, the riveting joint is usually designed at a right angle, which is difficult to process, requires secondary processing, and is costly. Moreover, stress concentration is prone to occur at the right angle, which can easily lead to riveting failure or breakage.

[0004] In addition, gaps can easily appear between the rivet block and the electrode post, which can lead to the risk of electrolyte leakage.

[0005] To address the aforementioned issues, there is an urgent need for a positive electrode cover plate assembly that is simple in structure, high in strength, and highly efficient in processing. Utility Model Content

[0006] This utility model provides a positive electrode cover plate assembly to solve the problems of high difficulty in riveting and high defect rate in related technologies.

[0007] This utility model embodiment also provides a battery.

[0008] The first aspect of this utility model provides a positive electrode cover plate assembly, comprising:

[0009] pole;

[0010] A riveting block is disposed between the lower plastic and the positive electrode connecting piece. A riveting rib is formed at the end of the electrode post facing the riveting block. A connecting surface is formed on the riveting block to mate with the riveting rib. Along the axial direction of the electrode post, the thickness of the riveting rib gradually decreases from the root of the riveting rib to the end of the riveting rib.

[0011] According to one embodiment of the present invention, one end of the pole post is formed with an extension portion extending along the axial direction of the pole post, and the riveting rib is formed at the root of the extension portion.

[0012] According to one embodiment of the present invention, the angle between the connecting surface and the axis of the pole is in the range of 10 degrees to 75 degrees.

[0013] According to one embodiment of the present invention, the width of the extension portion along the radial direction of the pole post is greater than or equal to 2.0 mm and less than or equal to 3.2 mm.

[0014] According to one embodiment of the present invention, along the axial direction of the pole post, the height of the riveting rib is greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0015] According to one embodiment of the present invention, the width of the rivet rib along the radial direction of the pole post is greater than or equal to 0.5 mm and less than or equal to 0.9 mm.

[0016] According to one embodiment of the present invention, along the radial direction of the pole post, the riveting width of the riveting rib and the riveting block is greater than or equal to 0.5 mm and less than or equal to 0.6 mm.

[0017] According to one embodiment of the present invention, the reserved gap between the electrode post and the lower plastic in the axial direction perpendicular to the electrode post is greater than or equal to 0.1 mm and less than or equal to 0.15 mm.

[0018] According to one embodiment of the present invention, the thickness of the riveting block along the axial direction of the pole post is greater than or equal to 1.0 mm and less than or equal to 1.5 mm.

[0019] A second aspect of this utility model provides a battery, including the positive electrode cover assembly as described above.

[0020] According to the first aspect of this utility model, a positive electrode cover assembly is provided. By optimizing the riveting structure, the electrode post and the riveting block form an inclined connection, reducing riveting difficulty, eliminating stress concentration, improving bonding strength, and enhancing assembly efficiency and battery reliability. The positive electrode cover assembly of this utility model also ensures mechanical strength and sealing ring compression through optimized structural parameters, and the electrode post is formed in one stamping process, eliminating the need for secondary processing and reducing production costs. Compared with related technology positive electrode assemblies, the above improvements significantly enhance the reliability, sealing performance, and production efficiency of the positive electrode cover, while reducing processing difficulty and defect rate.

[0021] According to the second aspect of the present invention, the battery, through the innovative structural design of the above-mentioned positive electrode cover assembly, achieves a high standard of overall strength and sealing performance, and makes a breakthrough improvement in battery sealing performance, environmental adaptability and industrial production efficiency. It also greatly improves production efficiency and reduces manufacturing costs, thus meeting the needs of large-scale industrialization. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of a positive electrode cover plate assembly provided by this utility model.

[0024] Figure 2 This is a partial schematic diagram of the connection surface between the pole post and the riveting block of a positive electrode cover plate assembly provided by this utility model.

[0025] Figure 3 This is a structural schematic diagram of a positive electrode cover plate assembly provided by this utility model.

[0026] Figure label:

[0027] 100. Terminal post; 101. Sealing ring; 102. Upper plastic; 103. Battery casing; 104. Lower plastic; 105. Riveting block; 106. Positive electrode connecting piece; 107. Riveting rib; 108. Extension. Detailed Implementation

[0028] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0029] like Figures 1 to 3 As shown, the positive electrode cover plate assembly provided in the first aspect embodiment of this utility model includes an electrode post 100 and a riveting block 105 disposed between the lower plastic 104 and the positive electrode connecting piece 106. A riveting rib 107 is formed at the end of the electrode post 100 facing the riveting block 105. A connecting surface that rivets with the riveting rib 107 is formed on the riveting block 105. Along the axial direction of the electrode post 100, the thickness of the riveting rib 107 gradually decreases from the root of the riveting rib 107 to the end of the riveting rib 107.

[0030] Specifically, the positive terminal of the battery casing 103 is positioned between the upper plastic 102 and the lower plastic 104. A sealing ring 101 is provided between the terminal post 100 and the upper plastic 102. A riveting block 105 is positioned between the lower plastic 104 and the positive electrode connecting piece 106. The terminal post 100 is provided with a riveting rib 107, and the riveting block 105 has a connecting surface that mates with the riveting rib 107. The design of the connecting surface simplifies the riveting process. The riveting rib 107 of the terminal post 100 can be stamped in one piece without secondary processing, significantly improving the battery's production efficiency and safety.

[0031] It is understood that the aforementioned electrode post 100 and positive electrode connecting piece 106 can be connected in a suitable manner, as long as a seamless seal between the electrode post 100 and the positive electrode connecting piece 106 can be achieved. In one embodiment, for example, butt welding can be used. In another embodiment, for example, through welding can be used.

[0032] By providing riveting ribs 107 with gradually decreasing thickness at the end of the pole post 100, a progressive pressing interface is formed with the riveting block 105. This design ensures that the riveting force is evenly distributed axially, avoiding metal fatigue caused by stress concentration.

[0033] According to one embodiment of the present invention, one end of the pole post 100 is formed with an extension portion 108 extending in the axial direction of the pole post 100, and a riveting rib 107 is formed at the root of the extension portion 108.

[0034] In this embodiment, the design of the extension 108 enhances the bonding force between the pole post 100 and the plastic part, improving vibration resistance. Furthermore, it disperses riveting stress, preventing localized fatigue failure and extending the component's service life.

[0035] According to one embodiment of the present invention, the angle between the connecting surface and the axis of the pole post 100 ranges from 10 degrees to 75 degrees.

[0036] In this embodiment, by limiting the angle range between the connecting surface and the axis of the pole 100, the riveting force distribution is optimized, the risk of breakage of the riveting rib 107 is reduced, and the riveting strength is improved. At the same time, this angle range adapts to the assembly requirements of batteries of different sizes, enhancing structural versatility.

[0037] The angle between the connecting surface and the pole axis is designed to be 10 to 75 degrees. The optimal angle range is determined through mechanical calculations. This angle range can accommodate the differences in the expansion coefficients of different materials and avoid poor contact caused by metal creep.

[0038] According to one embodiment of the present invention, the width of the extension 108 along the radial direction of the pole post 100 is greater than or equal to 2.0 mm and less than or equal to 3.2 mm.

[0039] The design of the electrode extension 108, which is embedded between the upper plastic 102 and the positive electrode connecting piece 106, forms a three-dimensional positioning system. By limiting the width W of the extension 108 to 2.0mm≤W≤3.2mm, it is ensured that the extension forms a mechanical interlock with the plastic part during injection molding. This structure greatly improves the component's resistance to lateral tensile forces, while controlling the leakage rate at the interface between the electrode and the plastic part to a level better than industry standards.

[0040] Furthermore, by limiting the width W of the extension 108 along the radial direction of the pole post 100 to 2.0mm≤W≤3.2mm, the mechanical strength of the extension 108 is ensured, the tensile strength reaches a high level, the deformation displacement of the plastic part caused by thermal expansion is prevented, and the structural stability is improved.

[0041] According to one embodiment of the present invention, the height of the riveting rib 107 along the axial direction of the pole post 100 is greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0042] In this embodiment, by limiting the height H1 of the riveting rib 107 along the axial direction of the pole post 100 to greater than or equal to 0.3 mm and less than or equal to 0.7 mm, the local bearing capacity of the riveting block 105 can be enhanced, the deformation resistance can be improved, the structural plastic deformation caused by excessive riveting force can be prevented, and the long-term stability can be ensured.

[0043] According to one embodiment of the present invention, the width of the riveting rib 107 along the radial direction of the pole post 100 is greater than or equal to 0.5 mm and less than or equal to 0.9 mm.

[0044] In this embodiment, by limiting the width W1 of the riveting rib 107 to 0.5mm≤W1≤0.9, sufficient riveting contact area can be provided, the connection reliability is greatly improved, gap problems caused by material deformation during riveting are avoided, and sealing is ensured.

[0045] According to one embodiment of the present invention, along the radial direction of the pole post 100, the riveting width of the riveting rib 107 and the riveting block 105 is greater than or equal to 0.5 mm and less than or equal to 0.6 mm.

[0046] In this embodiment, by limiting the width W2 of the riveting to 0.5mm≤W2≤0.6mm, the stability of the structure after riveting is ensured, the shear resistance is improved, the risk of fretting wear on the riveting surface caused by vibration is reduced, and the service life of the component is extended.

[0047] According to one embodiment of the present invention, the reserved gap between the pole post 100 and the lower plastic 104 in the axial direction perpendicular to the pole post 100 is greater than or equal to 0.1 mm and less than or equal to 0.15 mm.

[0048] In this embodiment, by limiting the reserved gap G to 0.1mm≤G≤0.15mm, this embodiment provides deformation space for the riveting of the pole post 100, avoiding damage to the lower plastic 104 and improving product yield. At the same time, this structure adapts to differences in thermal expansion, preventing stress concentration inside the component.

[0049] On the other hand, it is understandable that the gap between the sealing ring 101 and the pole post 100 is also greater than or equal to 0.1 mm and less than or equal to 0.15 mm.

[0050] According to one embodiment of the present invention, the thickness of the riveting block 105 along the axial direction of the pole post 100 is greater than or equal to 1.0 mm and less than or equal to 1.5 mm.

[0051] In this embodiment, by limiting the thickness H of the riveting block to 1.02mm≤H≤1.5mm, the rigidity of the riveting block 105 is ensured, and the compressive strength is improved. Therefore, the loosening of the connection caused by material springback during the riveting process can be reduced, and the assembly reliability is improved.

[0052] A second aspect of this utility model provides a battery, including the positive electrode cover assembly as described above.

[0053] The battery features a cylindrical design with a high-strength, corrosion-resistant metal casing, such as stainless steel, to protect the internal components. Inside, from the inside out, are the negative electrode, separator, and positive electrode (or a positive electrode structure including the positive electrode cover assembly as described above). The negative electrode uses graphite or other active materials, uniformly coated onto the negative electrode current collector. The positive electrode uses lithium cobalt oxide or other active materials, similarly coated onto the positive electrode current collector, which is typically aluminum foil. The separator is positioned between the positive and negative electrodes, isolating them and preventing short circuits while allowing lithium ions to pass through.

[0054] The specific structure of the positive electrode cover assembly included in the battery provided in the second aspect embodiment of this utility model is the same as that of the positive electrode cover assembly provided in the first aspect embodiment of this utility model, and will not be described again here. By adopting the above-mentioned positive electrode cover assembly, the overall sealing performance of the battery can reach a high standard, making it suitable for high humidity and high vibration environments. Furthermore, production efficiency is greatly improved, while manufacturing costs are reduced, meeting the needs of large-scale industrialization.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A positive cover plate assembly, characterized by, include: pole; A riveting block is disposed between the lower plastic and the positive electrode connecting piece. Along the axial direction of the electrode post, a riveting rib is formed at the end of the electrode post near the riveting block. A connecting surface is formed on the riveting block to mate with the riveting rib. Along the axial direction of the electrode post, the thickness of the riveting rib gradually decreases from the root of the riveting rib to the end of the riveting rib.

2. The positive cover plate assembly of claim 1, wherein, One end of the pole post has an extension that extends along the axial direction of the pole post, and the rivet rib is formed at the root of the extension.

3. The positive cover plate assembly of claim 1, wherein, The angle between the connecting surface and the axis of the pole is in the range of 10 degrees to 75 degrees.

4. The positive cover plate assembly of claim 2, wherein, Along the radial direction of the pole post, the width of the extension ranges from greater than or equal to 2.0 mm to less than or equal to 3.2 mm.

5. The positive cover plate assembly of claim 2, wherein, Along the axial direction of the pole, the height of the rivet rib is greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

6. The positive cover plate assembly of claim 5, wherein, Along the radial direction of the pole post, the width of the rivet rib is greater than or equal to 0.5 mm and less than or equal to 0.9 mm.

7. The positive cover plate assembly of any one of claims 1 to 6, wherein, Along the radial direction of the pole post, the riveting width of the riveting rib and the riveting block is greater than or equal to 0.5 mm and less than or equal to 0.6 mm.

8. The positive electrode cover plate assembly according to any one of claims 1 to 6, characterized in that, The reserved gap between the electrode post and the lower plastic in the axial direction perpendicular to the electrode post is greater than or equal to 0.1 mm and less than or equal to 0.15 mm.

9. The positive electrode cover plate assembly according to any one of claims 1 to 6, characterized in that, The thickness of the rivet block along the axial direction of the pole post is greater than or equal to 1.0 mm and less than or equal to 1.5 mm.

10. A battery, characterized in that, Includes the positive electrode cover assembly as described in any one of claims 1 to 9.

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