Positive electrode cover plate assembly and battery

Abstract

The utility model relates to the field of batteries, and provides a positive electrode cover plate assembly and a battery. The positive electrode cover plate assembly comprises a pole; the riveting block is arranged between the lower plastic and the positive electrode connecting piece, a riveting rib is formed on the end part, close to the riveting block, of the pole along the axial direction of the pole, a matching surface matched with the riveting rib in a riveting manner is formed on the riveting block, and the riveting rib is matched with the matching surface from the root part of the riveting rib to the end part of the riveting rib along the axial direction of the pole. The thickness of the riveting rib is gradually reduced, and a penetrating welding area is formed between the pole and the positive electrode connecting piece. According to the positive electrode cover plate assembly and the battery, the pole and the riveting block form inclined plane connection, so that the riveting difficulty is reduced, and the stress concentration is eliminated; a penetration welding process is adopted, so that the pole and the positive electrode connecting piece are connected through a penetration welding seam, the sealing performance is enhanced, and the processing difficulty and the product reject ratio are reduced.

Description

Technical Field

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

[0002] In the current cylindrical battery production process, the positive electrode cover assembly is usually composed of electrode posts, riveting blocks, sealing rings 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. Moreover, the welding of the positive electrode connecting piece and the electrode post requires high-precision positioning, the welding process is complex, inefficient and prone to incomplete welding.

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

[0006] This utility model provides a positive electrode cover plate assembly to solve the problems of difficult riveting and poor sealing 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 assembly, comprising:

[0009] pole;

[0010] 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 mating 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 to the end of the riveting rib.

[0011] A through-welding area is formed between the electrode post and the positive electrode connecting piece.

[0012] According to one embodiment of the present invention, the angle between the mating 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, 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.

[0014] According to one embodiment of the present invention, the width of the extension is greater than or equal to 2.0 mm and less than or equal to 3.2 mm along the radial direction of the pole post.

[0015] According to one embodiment of the present invention, the height of the riveting rib along the axial direction of the pole post is greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0016] 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.

[0017] According to one embodiment of the present invention, along the radial direction of the pole post, the riveting width between 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.

[0018] 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.

[0019] 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.

[0020] A second aspect of this utility model provides a battery, including the positive electrode cover assembly as described above.

[0021] According to the positive electrode cover assembly provided in the first aspect of this utility model, by optimizing the riveting structure and welding process, the electrode post and the riveting block are connected on an inclined surface, reducing riveting difficulty, eliminating stress concentration, and improving bonding strength. The first aspect of this utility model also employs a through-welding process, connecting the electrode post and the positive electrode connecting piece through a through weld, enhancing sealing performance and reducing the positioning accuracy requirements of the production line. Through structural parameter optimization, mechanical strength and sealing ring compression are ensured, and the electrode post is formed in one stamping step, eliminating the need for secondary processing and reducing production costs. Compared with positive electrode assemblies of related technologies, the above improvements significantly enhance the reliability, sealing performance, and production efficiency of the positive electrode cover, while reducing processing difficulty and defect rate.

[0022] According to the second aspect of the present invention, the battery including the positive electrode cover assembly can achieve a high standard of overall sealing performance by adopting the above-mentioned positive electrode cover assembly, making it suitable for high humidity and high vibration environments, and greatly improving production efficiency while reducing manufacturing costs, thus meeting the needs of large-scale industrialization. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a cross-sectional view of the positive electrode cover plate assembly provided by this utility model.

[0025] Figure 2 This is a partial schematic diagram of the mating surface between the electrode post and the riveting block of the positive electrode cover plate assembly provided by this utility model.

[0026] Figure 3 This is a schematic diagram of the through-welding area of ​​the positive electrode cover plate assembly provided by this utility model.

[0027] Figure 4 This is a structural schematic diagram of the positive electrode cover plate assembly provided by this utility model.

[0028] Figure label:

[0029] 1. Terminal post; 2. Sealing ring; 3. Upper plastic; 4. Battery casing; 5. Lower plastic; 6. Riveting block; 7. Positive electrode connecting piece; 8. Riveting rib; 9. Through weld; 10. Extension. Detailed Implementation

[0030] 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.

[0031] like Figures 1 to 4 As shown, the positive electrode cover plate assembly provided in the first aspect embodiment of this utility model includes an electrode post 1; a riveting block 6 disposed between the lower plastic 5 and the positive electrode connecting piece 7. Along the axial direction of the electrode post 1, a riveting rib 8 is formed at the end of the electrode post 1 near the riveting block 6. A mating surface is formed on the riveting block 6 to engage with the riveting rib 8. Along the axial direction of the electrode post 1, the thickness of the riveting rib 8 gradually decreases from the root to the end of the riveting rib 8.

[0032] A through-welding area is formed between the electrode post 1 and the positive electrode connecting piece 7.

[0033] Specifically, the positive terminal of the battery casing 4 is positioned between the upper plastic 3 and the lower plastic 5. A sealing ring 2 is provided between the terminal post 1 and the upper plastic 3. A riveting block 6 is positioned between the lower plastic 5 and the positive electrode connecting piece 7. The terminal post 1 has a riveting rib 8, and the riveting block 6 has a mating surface that mates with the riveting rib 8. The terminal post 1 and the positive electrode connecting piece 7 are connected by a through weld 9 formed by penetration welding. The design of the mating surface simplifies the riveting process. The riveting rib 8 of the terminal post 1 can be stamped in one piece without secondary processing, significantly improving the yield of the component. At the same time, the through weld 9 formed by penetration welding achieves a seamless seal between the terminal post 1 and the positive electrode connecting piece 7, greatly reducing the risk of electrolyte leakage and significantly improving battery safety and production efficiency.

[0034] It is understood that the welding between the electrode post 1 and the positive electrode connecting piece 7 described above is only an example, and other suitable connection methods can also be used, as long as a seamless seal between the electrode post 1 and the positive electrode connecting piece 7 can be achieved. In one embodiment, for example, butt welding can be used.

[0035] According to one embodiment of the present invention, such as Figure 2 As shown, the angle between the mating surface and the axis of pole 1 ranges from 10 degrees to 75 degrees.

[0036] By limiting the angle range between the mating surface and the pole axis, the riveting force distribution was optimized, reducing the risk of breakage of the riveting rib 8 and improving the riveting strength. At the same time, this angle range adapts to the assembly requirements of batteries of different sizes, enhancing structural versatility.

[0037] According to one embodiment of the present invention, such as Figure 4 As shown, one end of the pole post 1 has an extension 10 extending along the axial direction of the pole post 1, and a riveting rib 8 is formed at the root of the extension 10.

[0038] The design of the extension 10 enhances the bonding force between the pole post 1 and the plastic part, improving vibration resistance. Furthermore, it disperses riveting stress, preventing localized fatigue failure and extending the component's service life.

[0039] According to one embodiment of the present invention, the width of the extension 10 along the radial direction of the pole post 1 is greater than or equal to 2 mm and less than or equal to 3.2 mm.

[0040] By limiting the width W of the extension portion along the radial direction of the pole post 1 to 2mm≤W≤3.2mm, the mechanical strength of the extension portion 10 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 8 along the axial direction of the pole post 1 is greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0042] By limiting the height H1 of the rivet 8 along the axial direction of the pole post 1 to 0.3mm≤H1≤0.7mm, the local bearing capacity of the rivet 8 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 8 along the radial direction of the pole post 1 is greater than or equal to 0.5 mm and less than or equal to 0.9 mm.

[0044] By limiting the width W1 of the riveting rib 8 to 0.5mm≤W1≤0.9mm, sufficient riveting contact area can be provided, the connection reliability is greatly improved, gap problems caused by material deformation during riveting are avoided, and the sealing performance is ensured.

[0045] According to one embodiment of the present invention, along the radial direction of the pole post 1, the riveting width between the riveting rib 8 and the riveting block 6 is greater than or equal to 0.5 mm and less than or equal to 0.6 mm.

[0046] By limiting the riveting width W2 to 0.5mm≤W2≤0.6mm, the stability of the riveted structure is ensured, the shear resistance is improved, and the risk of fretting wear on the riveting surface due to vibration is reduced, thereby extending the service life of the component.

[0047] According to one embodiment of the present invention, the reserved gap G between the electrode post 1 and the lower plastic 5 in the axial direction perpendicular to the electrode post 1 is greater than or equal to 0.1 mm and less than or equal to 0.15 mm.

[0048] By limiting the reserved gap G to 0.1mm≤G≤0.15mm, this embodiment provides deformation space for the riveting of the pole post 1, avoiding damage to the lower plastic 5 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 2 and the pole post 1 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 H of the riveting block 6 along the axial direction of the pole post 1 is greater than or equal to 1.0 mm and less than or equal to 1.5 mm.

[0051] By limiting the thickness H of the rivet block to 1.0mm≤H≤1.5mm, the rigidity of the rivet block 6 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 mating 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 to the end of the riveting rib. A through-welding area is formed between the electrode post and the positive electrode connecting piece.

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

3. 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.

4. The positive cover plate assembly of claim 3, wherein, Along the radial direction of the pole post, the width of the extension is greater than or equal to 2.0 mm and less than or equal to 3.2 mm.

5. The positive cover plate assembly of claim 3, wherein, Along the axial direction of the pole post, 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 between 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 cover plate assembly of any one of claims 1 to 6, wherein, 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 cover plate assembly of any one of claims 1 to 6, wherein, 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 by Includes the positive electrode cover assembly as described in any one of claims 1 to 9.

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