A top cover assembly and a battery

Abstract

The application provides a top cover assembly and a battery, and belongs to the technical field of batteries. The top cover assembly comprises a pole, a first sealing element, a first metal element and a second metal element. The first sealing element is arranged in a peripheral circumference of the pole. The first metal element is arranged in a peripheral circumference of the first sealing element. The second metal element abuts against the first sealing element. The second metal element and the first sealing element jointly form a containing groove for containing the first metal element. When the top cover assembly is used to be mounted to the battery, an opening of the containing groove faces an outer side of the battery. The top cover assembly provided by the application embodiment realizes stable connection of different components, reduces the risk of contact between the connecting part of different metal components and electrolyte, and ensures the stability during the operation of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a top cover assembly and a battery. Background Technology

[0002] As a key structural component of the battery, the top cover needs to perform functions such as terminal connection and sealing protection. The top cover assembly is usually composed of multiple metal components, and these components are made of different materials. When the top cover is installed on the battery, if the connection points of the metal components of different materials come into contact with the electrolyte inside the battery, a galvanic cell reaction will occur, which can easily lead to corrosion of the connection points and electrolyte contamination, affecting the stability of the battery. Utility Model Content

[0003] The embodiments of this application provide a top cover assembly and a battery that can reduce the risk of contact with electrolyte and improve battery stability.

[0004] In a first aspect, embodiments of this application provide a top cover assembly, comprising:

[0005] pole;

[0006] The first sealing element is disposed circumferentially around the periphery of the pole post;

[0007] The first metal component is disposed circumferentially around the first seal.

[0008] The second metal part abuts against the first seal, and the second metal part and the first seal together form a receiving groove for accommodating the first metal part, wherein when the top cover assembly is used to install to the battery, the opening of the receiving groove faces the outside of the battery.

[0009] In some embodiments, the second metal member includes a main body and an extension. The main body is disposed circumferentially around the first metal member, and the extension is stacked with the first metal member along the thickness direction of the top cover assembly, and the extension abuts against the first seal.

[0010] In some embodiments, the first metal part and the second metal part are welded together.

[0011] In some embodiments, the inner wall of the extension abuts against the outer wall of the first seal.

[0012] In some embodiments, a first adhesive layer is provided between the inner wall of the extension and the outer wall of the first seal, and the extension and the first seal are connected by the first adhesive layer.

[0013] In some embodiments, the extension and the first seal are stacked along the thickness direction of the top cover assembly, and the inner wall of the extension abuts against the outer wall of the pole post.

[0014] In some embodiments, a second adhesive layer is provided between the inner wall of the extension and the outer wall of the pole, and the extension and the pole are connected by the second adhesive layer.

[0015] In some embodiments, the top cover assembly further includes an insulating element;

[0016] The insulating component and the second metal component are stacked along the thickness direction of the top cover assembly, and the insulating component is arranged around the periphery of the pole post.

[0017] In some embodiments, the top cover assembly further includes a second seal disposed between the insulator and the pole.

[0018] In some embodiments, the extension includes a welded portion and a supporting portion that are interconnected;

[0019] The welding part is welded to the first metal part, and the supporting part is stacked with the first metal part along the thickness direction of the top cover assembly.

[0020] Secondly, embodiments of this application provide a battery, including a housing and a top cover assembly as described above;

[0021] An opening is provided at one end of the housing, and the top cover assembly is connected to the housing to seal the opening.

[0022] The beneficial effects of the embodiments of this application are as follows:

[0023] In embodiments of this application, the top cover assembly includes a terminal post, a first sealing element, a first metal element, and a second metal element. The first sealing element is circumferentially disposed around the terminal post, the first metal element is disposed circumferentially around the first sealing element, and the second metal element abuts against the first sealing element. The second metal element and the first sealing element together form a receiving groove for accommodating the first metal element. When the top cover assembly is installed into a battery, the opening of the receiving groove faces outwards from the battery. By circumferentially disposing the first sealing element around the terminal post, the surface of the terminal post can be sealed, and the first sealing element also provides insulation between the first metal element and the terminal post. The receiving groove formed by the second metal element and the first sealing element accommodates the first metal element, and when the top cover assembly is installed into a battery, the opening of the receiving groove faces outwards from the battery. This isolates the first metal element from the electrolyte inside the battery, preventing the electrolyte from contacting the connection between the first and second metal elements, reducing the occurrence of galvanic cell reactions, and thus ensuring the stability of battery operation. That is, the top cover assembly provided in this application embodiment achieves stable connection between different components while reducing the risk of contact between the connection points of different metal components and the electrolyte, thus ensuring the stability of the battery during operation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the longitudinal cross-sectional structure of the top cover assembly provided in an embodiment of this application. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of the top cover assembly provided in the embodiments of this application. Figure 2

[0027] Figure 3 yes Figure 1 Enlarged view of point A in the middle;

[0028] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the top cover assembly provided in an embodiment of this application. Figure 3 ;

[0029] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0030] Figure 6 yes Figure 4 Enlarged view of point C in the middle;

[0031] Figure 7 This is a schematic diagram of the battery structure provided in the embodiments of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Top cover assembly; 10. Pole post; 20. First seal; 30. First metal part; 31. Receiving groove; 40. Second metal part; 41. Main body; 42. Extension; 421. Welding part; 422. Supporting part; 43. First adhesive layer; 44. Second adhesive layer; 50. Insulating part; 51. Snap-fit ​​part; 52. Second seal; 200. Housing. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0035] Firstly, such as Figures 1-3 As shown, an embodiment of this application provides a top cover assembly 100 including a terminal post 10, a first sealing member 20, a first metal member 30, and a second metal member 40. The first sealing member 20 is disposed around the periphery of the terminal post 10, the first metal member 30 is disposed around the periphery of the first sealing member 20, and the second metal member 40 abuts against the first sealing member 20. The second metal member 40 and the first sealing member 20 together form a receiving groove 31 for accommodating the first metal member 30. When the top cover assembly 100 is used to install onto a battery, the opening of the receiving groove 31 faces outward from the battery. By disposing of the first sealing member 20 around the periphery of the terminal post 10, the surface of the terminal post 10 can be sealed, and the first sealing member 20 can also achieve insulation isolation between the first metal member 30 and the terminal post 10. The receiving groove 31, formed by the second metal component 40 and the first sealing component 20, accommodates the first metal component 30. When the top cover assembly 100 is installed in the battery, the opening of the receiving groove 31 faces the outside of the battery, thus isolating the first metal component 30 from the electrolyte inside the battery. This prevents the electrolyte from contacting the connection between the first metal component 30 and the second metal component 40, reducing the occurrence of galvanic cell reactions and ensuring the stability of battery operation. In other words, the top cover assembly 100 provided in this application embodiment achieves stable connection between different components while reducing the risk of contact between the connection between different metal components and the electrolyte, ensuring the stability of the battery during operation.

[0036] That is, such as Figure 2 As shown, when the top cover assembly 100 is installed into the battery, the second metal part 40 and the first sealing part 20 abut against each other and form a receiving groove 31, thereby isolating the first metal part 30 from the inside of the battery. This prevents the connection between the first metal part 30 and the second metal part 40 from directly contacting the electrolyte inside the battery, avoiding the occurrence of a primary battery reaction, and thus reducing the risk of corrosion at the connection and contamination of the electrolyte, ensuring the stability of the battery operation.

[0037] In some embodiments, such as Figures 1-6 As shown, the second metal part 40 includes a main body 41 and an extension 42. The main body 41 is disposed around the periphery of the first metal part 30. The extension 42 is stacked with the first metal part 30 along the thickness direction of the top cover assembly 100, and the extension 42 abuts against the first sealing member 20.

[0038] The main body 41 of the second metal part 40 is disposed circumferentially around the first metal part 30, so that the main body 41 and the first metal part 30 cooperate to form an integral top cover assembly 100. The extension 42 is stacked with the first metal part 30 in the top cover direction and abuts against the first sealing member 20, so that the extension 42 and the first sealing member 20 can surround and form a receiving groove 31 to accommodate the first metal part 30 and achieve isolation between the first metal part 30 and the inside of the battery.

[0039] In some embodiments, the first seal 20 is a glass seal. Glass seals have higher electrochemical stability and more reliable sealing, which can improve sealing effectiveness and stability and extend the service life of the top cover assembly 100.

[0040] The battery casing 200 is generally made of aluminum or aluminum alloy, but aluminum and aluminum alloy have low melting points. When using glass seals, materials with higher melting points (such as stainless steel) are used for the terminals 10 and the first metal part 30 to facilitate the molding of the glass seals. Therefore, the top cover assembly 100 contains first metal parts 30 and second metal parts 40 of different materials. As mentioned above, when first metal parts 30 and second metal parts 40 of different materials are connected, if the connection point comes into contact with the electrolyte, a galvanic cell reaction is likely to occur, leading to corrosion at the connection point and electrolyte contamination. In this embodiment, the extension 42 of the second metal part 40 is stacked with the first metal part 30, which reduces the risk of the connection point coming into contact with the electrolyte.

[0041] In some embodiments, the first metal part 30 and the second metal part 40 are welded together. By welding the first metal part 30 and the second metal part 40 together, the first metal part 30 and the second metal part 40 can be formed into a whole, ensuring the stability of their connection.

[0042] For example, the first metal part 30 and the second metal part 40 can be joined by brazing. Brazing is a welding process that combines metals of different materials by heating and adding a filler material. Its characteristic is that the connection is achieved by melting the filler metal without melting the substrate. Therefore, brazing is particularly suitable for metal materials that are difficult to join using conventional welding methods due to significant differences in melting points. In the brazing process, the filler metal is typically an alloy with a low melting point. This alloy melts into the gaps in the substrate when heated and forms a strong connection upon cooling. Brazing not only effectively joins metals of different materials but also improves the stability of the weld, ensuring the mechanical properties and durability of the joint. Furthermore, brazing technology can provide high-quality weld results without damaging the surface and internal structure of the metal parts, making it an ideal choice for achieving complex material combinations.

[0043] In some embodiments, such as Figures 1-4 As shown, the inner wall of the extension 42 abuts against the outer wall of the first seal 20. That is, the extension 42 is arranged around the first seal 20, thereby forming a closed structure throughout the circumference. Through this structure, the first seal 20 can not only achieve a sealed connection to the pole post 10 to prevent leakage of liquid or gas, but also ensure the insulation isolation between the pole post 10 and the first metal part 30 and the second metal part 40, thereby improving the safety and stability of the entire system.

[0044] In some embodiments, such as Figure 3 As shown, a first adhesive layer 43 is provided between the inner wall of the extension 42 and the outer wall of the first seal 20, and the extension 42 and the first seal 20 are connected by the first adhesive layer 43.

[0045] The extension 42 and the first seal 20 are tightly connected by the first adhesive layer 43, thereby significantly improving the connection stability between them. The first adhesive layer 43 not only enhances the mechanical properties of the bond between the extension 42 and the first seal 20, but also provides additional assurance for the sealing performance of the top cover assembly 100. This sealing performance greatly reduces the risk of electrolyte leakage through the gap between the inner wall of the extension 42 and the outer wall of the first seal 20. Through this design, the overall structure of the top cover assembly 100 is more compact, extending its service life and reducing maintenance costs. Furthermore, the material and thickness of the first adhesive layer 43 can be adjusted according to the needs of different applications to achieve good performance and reliability.

[0046] In some embodiments, such as Figures 4-5 As shown, the extension 42 and the first sealing member 20 are stacked along the thickness direction of the top cover assembly 100, and the inner wall of the extension 42 abuts against the outer wall of the pole post 10.

[0047] In this embodiment, the extension 42 and the first sealing member 20 are stacked along the thickness direction of the top cover assembly 100, and the extension 42 can support the first sealing member 20. Simultaneously, the inner wall of the extension 42 abuts against the outer wall of the electrode post 10, so that the first sealing member 20 and the first metal member 30 are distributed on one side of the second metal member 40 in the thickness direction of the top cover assembly 100. The second metal member 40, through its main body 41 and the extension 42, can support the first sealing member 20 and the first metal member 30, reducing the risk of contact between the electrolyte and the connection points of the first metal member 30 and the second metal member 40.

[0048] In some embodiments, such as Figure 5 As shown, a second adhesive layer 44 is provided between the inner wall of the extension 42 and the outer wall of the electrode post 10. The extension 42 and the electrode post 10 are tightly connected by this second adhesive layer 44, thereby significantly improving the connection stability between them. The second adhesive layer 44 not only enhances the bonding force between the extension 42 and the electrode post 10 in terms of mechanical properties, but also provides additional protection for the sealing of the top cover assembly 100. This sealing greatly reduces the risk of electrolyte leakage through the gap between the inner wall of the extension 42 and the outer wall of the electrode post 10. Through this design, the overall structure of the top cover assembly 100 is more compact, extending its service life and reducing maintenance costs. In addition, the selection of the material and thickness of the second adhesive layer 44 can be adjusted according to the needs of different applications to obtain good performance and reliability.

[0049] In some embodiments, such as Figures 1-6 As shown, the top cover assembly 100 also includes an insulating member 50. The insulating member 50 and the second metal member 40 are stacked along the thickness direction of the top cover assembly 100, and the insulating member 50 is arranged around the periphery of the terminal post 10. The insulating member 50 can form an insulating barrier between the first metal member 30 and the second metal member 40 in the top cover assembly 100 and the electrolyte, connecting pieces, etc. inside the battery, to prevent short circuits and ensure the stability of battery operation.

[0050] In some embodiments, such as Figure 1 and Figure 5 As shown, the insulating member 50 is provided with a snap-fit ​​part 51, which snaps the insulating member 50 with the second metal member 40 to fix the insulating member 50 and the second metal member 40, thereby improving the stability of the insulating member 50.

[0051] For example, the insulating element 50 can be in the form of a plastic seal. This plastic seal not only provides excellent insulation but also exhibits outstanding sealing performance. Its primary function is to prevent the first metal element 30 and the second metal element 40 from direct contact with the electrolyte and connecting pieces, thereby effectively reducing the risk of short circuits caused by exposed metal elements. Furthermore, the plastic seal ensures stable performance during long-term use. This design not only enhances the safety of the device but also extends its service life. In addition, the insulating element 50 can be customized to meet specific application needs, adapting to different environments and requirements, further enhancing its applicability and reliability. Simultaneously, the use of the plastic seal simplifies the assembly process of the device, providing a more convenient operating experience.

[0052] In some embodiments, such as Figure 4 and Figure 6 As shown, the top cover assembly 100 also includes a second seal 52, which is disposed between the insulator 50 and the electrode post 10. By providing the second seal 52 between the insulator 50 and the electrode post 10, the sealing effect of the insulator 50 can be improved, preventing electrolyte leakage from the gap between the insulator 50 and the electrode post 10.

[0053] For example, the second sealing element 52 can be a rubber sealing ring, which can fill the gap between the insulating element 50 and the pole post 10, improve the sealing effect, and the rubber sealing ring has good corrosion resistance and mechanical strength, which can improve stability.

[0054] In some embodiments, such as Figure 6 As shown, the extension 42 includes a welded portion 421 and a supporting portion 422 that are interconnected. The welded portion 421 is used to weld with the first metal part 30, ensuring a strong connection through the welding process, preventing structural loosening or detachment, and improving the overall reliability of the assembly. The supporting portion 422 is stacked with the first metal part 30 in the thickness direction of the top cover assembly 100 to form a stable support structure. This design not only provides sufficient load-bearing capacity for the first metal part 30 but also effectively disperses and transmits load pressure, maintaining the stability of the entire structure. The extension 42 can ensure that it can withstand various external environmental influences and mechanical stresses during use, thereby extending its service life and improving safety. In addition, the cooperation between the welded portion 421 and the supporting portion 422 also provides a solid foundation for other components of the top cover assembly 100, resulting in higher performance and efficiency of the entire system during operation.

[0055] Taking a cylindrical battery as an example, the terminal post 10 can be cylindrical, and the first sealing element 20, the first metal element 30 and the second metal element 40 can all be annular structures. The first sealing element 20 is sleeved on the terminal post 10, the first metal element 30 is sleeved on the first sealing element 20, and the second metal element 40 is sleeved around the first metal element 30, together forming the top cover assembly 100.

[0056] Secondly, such as Figure 7 As shown, an embodiment of this application provides a battery, including a housing 200 and a top cover assembly 100 as described above. One end of the housing 200 is provided with an opening, and the top cover assembly 100 is connected to the housing 200 to seal the opening.

[0057] The top cover assembly 100 and the housing 200 cooperate to form a cavity that can accommodate materials such as the battery core and electrolyte. The combined design of the housing 200 and the top cover assembly 100 also helps to improve the structural strength of the battery, enabling it to withstand external pressure and vibration, and making it suitable for a wider range of applications.

[0058] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A top cover assembly, characterized in that, include: pole; A first sealing element is disposed circumferentially around the periphery of the pole post; A first metal component is disposed circumferentially around the periphery of the first seal. A second metal component abuts against the first seal, and the second metal component and the first seal together form a receiving groove for accommodating the first metal component, wherein when the top cover assembly is used to install to the battery, the opening of the receiving groove faces the outside of the battery.

2. The top cover assembly according to claim 1, characterized in that, The second metal part includes a main body and an extension. The main body is disposed around the periphery of the first metal part. The extension is stacked with the first metal part along the thickness direction of the top cover assembly, and the extension abuts against the first sealing member.

3. The top cover assembly according to claim 1, characterized in that, The first sealing element is a glass sealing element.

4. The top cover assembly according to claim 1, characterized in that, The first metal part and the second metal part are welded together.

5. The top cover assembly according to claim 2, characterized in that, The inner wall of the extension abuts against the outer wall of the first seal.

6. The top cover assembly according to claim 5, characterized in that, A first adhesive layer is provided between the inner wall of the extension and the outer wall of the first seal, and the extension and the first seal are connected through the first adhesive layer.

7. The top cover assembly according to claim 2, characterized in that, The extension and the first sealing member are stacked together along the thickness direction of the top cover assembly, and the inner wall of the extension abuts against the outer wall of the pole post.

8. The top cover assembly according to claim 7, characterized in that, A second adhesive layer is provided between the inner wall of the extension and the outer wall of the pole, and the extension and the pole are connected by the second adhesive layer.

9. The top cover assembly according to any one of claims 1-8, characterized in that, The top cover assembly also includes insulating components; The insulating element and the second metal element are stacked along the thickness direction of the top cover assembly, and the insulating element is arranged around the periphery of the pole post.

10. The top cover assembly according to claim 9, characterized in that, The top cover assembly also includes a second seal disposed between the insulator and the pole post.

11. The top cover assembly according to claim 2, characterized in that, The extension includes a welded portion and a supporting portion that are interconnected; The welding part is welded to the first metal part, and the supporting part is stacked with the first metal part along the thickness direction of the top cover assembly.

12. A battery, characterized in that, Includes a housing and a top cover assembly as described in any one of claims 1-11; One end of the housing is provided with an opening, and the top cover assembly is connected to the housing to seal the opening.

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