A top cover assembly and a battery
By designing a structure in the top cover assembly with welded sections stacked along the thickness direction and surrounding weld gaps, combined with a raised structure and brazing layer, the problems of thermal expansion and internal stress during welding are solved, thereby improving the connection strength and sealing effect of metal parts.
Patent Information
- Application Number
- CN202521410398.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-04
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-07-04
AI Technical Summary
In the prior art, the welding process of the top cover assembly is easily affected by the welding heat, which can cause expansion and compression, affecting the welding quality between metal parts and thus reducing the sealing effect.
Design a top cover assembly in which a first metal part and a second metal part are stacked along the thickness direction through a welding part, and a welding gap is provided around the welding gap. The welding gap surrounds the periphery of the first welding part, and together with the protruding structure and the brazing layer, an integral connection is formed to reduce the impact of welding thermal expansion and internal stress.
It improves the connection strength of metal parts in the top cover assembly, ensures sealing effect, reduces the expansion effect and internal stress during welding, and enhances structural stability and welding yield.
Smart Images
Figure CN224683210U_ABST
Abstract
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 components. In related technologies, welding is used to connect adjacent metal parts in the top cover assembly to ensure the sealing effect. However, due to the small overall size of the top cover assembly, the welding process is easily affected by factors such as welding heat, which can lead to expansion and compression, affecting the welding quality between metal parts, resulting in lower weld strength, and thus affecting the sealing effect of the top cover assembly. Utility Model Content
[0003] The embodiments of this application provide a top cover assembly and a battery, which can improve the connection strength of the first metal part and the second metal part in the top cover assembly and ensure the sealing effect of the top cover assembly.
[0004] In a first aspect, embodiments of this application provide a top cover assembly, including a first metal member and a second metal member, wherein the second metal member is disposed circumferentially around the periphery of the first metal member;
[0005] A first welding part is provided on the side of the first metal part close to the second metal part, and a second welding part is provided on the side of the second metal part close to the first metal part. The first welding part and the second welding part are stacked along the thickness direction of the top cover assembly, and the first welding part and the second welding part are welded together.
[0006] A welding gap is provided between the first welding part and the second metal part, and the welding gap is arranged around the periphery of the first welding part.
[0007] In some embodiments, the second metal part is further provided with a protruding structure, which protrudes along the thickness direction of the top cover assembly;
[0008] The welding gap is located between the first welded part and the protruding structure.
[0009] In some embodiments, the maximum width between the protruding structure and the outer peripheral surface of the first welded part is d, where 0 mm < d < 1.5 mm.
[0010] In some embodiments, the minimum thickness of the second metal part at the protrusion structure is H1, the maximum thickness of the second metal part is H2, and 0.4H2 < H1 < H2.
[0011] In some embodiments, a brazing layer is provided between the first welding part and the second welding part, and the first welding part and the second welding part are connected by the brazing layer.
[0012] In some embodiments, the thickness of the brazing layer in the thickness direction of the top cover assembly is 0.05 mm to 3 mm.
[0013] In some embodiments, the second metal part is a ring structure with an outer diameter of D. A welding surface is formed between the first welding part and the second welding part. The width of the welding surface in the radial direction of the second metal part is W, which satisfies: 10% ≤ W / D ≤ 40%.
[0014] In some embodiments, W ≥ 1.8 mm.
[0015] In some embodiments, the top cover assembly further includes a pole and a first insulating element;
[0016] The electrode post is fitted inside the first metal part, and the first insulating part is disposed between the first metal part and the electrode post.
[0017] In some embodiments, the first insulating element is made of glass.
[0018] In some embodiments, the top cover assembly further includes a second insulating element;
[0019] The second insulating element is disposed around the periphery of the pole post, and the second insulating element covers one side of the first metal element, the second metal element, and the first insulating element.
[0020] Secondly, embodiments of this application provide a battery including the top cover assembly as described above.
[0021] The beneficial effects of the embodiments of this application are as follows:
[0022] In the embodiments of this application, the top cover assembly includes a first metal part and a second metal part, with the second metal part surrounding the periphery of the first metal part. A first welding portion is provided on the side of the first metal part near the second metal part, and a second welding portion is provided on the side of the second metal part near the first metal part. The first and second welding portions are stacked along the thickness direction of the top cover assembly and welded together. A welding gap is provided between the first welding portion and the second metal part, surrounding the periphery of the first welding portion. By stacking and welding the first and second welding portions along the thickness direction of the top cover assembly, the second metal part and the first metal part can be welded together to form a single unit. By providing a welding gap surrounding the periphery of the first welding portion, the expansion effect caused by heat during welding can be reduced, providing a buffer space and reducing the internal stress caused by compression during welding of the first and second metal parts, thus ensuring the connection strength between the first and second metal parts. In other words, the top cover assembly provided in this application embodiment can improve the connection strength between the first and second metal parts in the top cover assembly and ensure the sealing effect of the top cover assembly. Attached Figure Description
[0023] 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.
[0024] Figure 1 This is a schematic diagram of the structure of the top cover assembly provided in the embodiments of this application. Figure 1 ;
[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle;
[0026] Figure 3 This is a schematic diagram of the structure of the top cover assembly provided in the embodiments of this application. Figure 2 ;
[0027] Figure 4 yes Figure 1 Enlarged view of point A in the middle;
[0028] Figure 5 yes Figure 1 Enlarged view of point A in the middle;
[0029] Figure 6 This is a schematic diagram of the battery structure provided in the embodiments of this application.
[0030] Explanation of reference numerals in the attached figures:
[0031] 100. Top cover assembly; 10. First metal part; 11. First welded part; 111. Welded surface; 12. Welding gap; 13. Brazed layer; 20. Second metal part; 21. Second welded part; 22. Protruding structure; 30. Pole post; 40. First insulating part; 50. Second insulating part; 51. Snap-fit part; 200. Housing. Detailed Implementation
[0032] 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.
[0033] Firstly, such as Figures 1-2 As shown, an embodiment of this application provides a top cover assembly 100 including a first metal member 10 and a second metal member 20, the second metal member 20 being disposed circumferentially around the periphery of the first metal member 10. A first welding portion 11 is provided on the side of the first metal member 10 near the second metal member 20, and a second welding portion 21 is provided on the side of the second metal member 20 near the first metal member 10. The first welding portion 11 and the second welding portion 21 are stacked along the thickness direction of the top cover assembly 100 and welded together. A welding gap 12 is provided between the first welding portion 11 and the second metal member 20, the welding gap 12 being disposed circumferentially around the periphery of the first welding portion 11. By stacking the first welding portion 11 and the second welding portion 21 along the thickness direction of the top cover assembly 100 and welding them together, the second metal member 20 and the first metal member 10 can be formed into a single unit through welding. By setting a welding gap 12, which surrounds the periphery of the first welded part 11, the expansion effect caused by heat during welding can be reduced, providing a buffer space and reducing the internal stress caused by compression during welding of the first welded part 11 and the second metal part 20, thus ensuring the connection strength of the first metal part 10 and the second metal part 20. In other words, the top cover assembly 100 provided in this embodiment can improve the connection strength of the first metal part 10 and the second metal part 20 in the top cover assembly 100, ensuring the sealing effect of the top cover assembly 100.
[0034] In some embodiments, such as Figure 2As shown, the second metal part 20 is also provided with a protruding structure 22, which protrudes along the thickness direction of the top cover assembly 100. A welding gap 12 is disposed between the first welded portion 11 and the protruding structure 22. By providing the protruding structure 22 on the second metal part 20, the stress transmission path of the second metal part 20 can be changed, converting several loads into distributed loads and improving the overall structural strength. Simultaneously, the protruding structure 22 can also improve the stiffness and deformation resistance of the second metal part 20. Furthermore, the welding gap 12, disposed between the first welded portion 11 and the protruding structure 22, serves two purposes: firstly, it can disperse welding stress; secondly, it can act as a stress buffer layer, improving stress dispersion and ensuring welding stability. The cooperation between the welding gap 12 and the protruding structure 22 also helps to improve the welding yield.
[0035] In some embodiments, the maximum width between the protruding structure and the outer peripheral surface of the first welded portion is d, where 0 mm < d < 1.5 mm. For example... Figure 4 As shown, the maximum width between the protruding structure and the outer peripheral surface of the first welded part is the width of the welding gap 12, where 0mm < d < 1.5mm. By setting the maximum width d between the protruding structure and the outer peripheral surface of the first welded part to satisfy 0mm < d < 1.5mm, the mutual compression phenomenon caused by thermal expansion during welding can be reduced, thus reducing internal stress. In addition, the top cover assembly 100 has a small size, and by controlling the welding gap 12 within the above range, the space utilization rate can be improved, and the structural strength of the top cover assembly 100 at the welding gap 12 can be guaranteed.
[0036] For example, the width d of the welding gap 12 can be 0.01mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.49mm.
[0037] like Figure 1 and Figure 4 As shown, the welding gap 12 can be irregular in shape, and the width of the welding gap 12 refers to the distance between the first metal part 10 and the second metal part 20 during welding.
[0038] In some embodiments, such as Figure 2 and Figure 5 As shown, the minimum thickness of the second metal part 20 at the protrusion structure 22 is H1, and the maximum thickness of the second metal part 20 is H2, where 0.4H2 < H1 < H2.
[0039] When the minimum thickness H1 of the second metal part 20 at the protrusion structure 22 satisfies the above relationship, the protrusion structure 22 can meet the yield strength requirement, ensuring the strength of the protrusion structure 22, and can alleviate stress relaxation under cyclic loading, thus extending fatigue life. In addition, by satisfying the above relationship, phenomena such as brittle fracture caused by local thinning can be reduced, thereby improving the strength of the second metal part 20.
[0040] For example, the minimum thickness H1 of the second metal part 20 at the protrusion structure 22 can be 0.41H2, 0.45H2, 0.5H2, 0.55H2, 0.6H2, 0.65H2, 0.7H2, 0.75H2, 0.8H2, 0.85H2, 0.9H2, 0.95H2 or 0.99H2.
[0041] In some embodiments, such as Figure 2 , Figure 4 and Figure 5 As shown, a brazing layer 13 is provided between the first welded part 11 and the second welded part 21, and the first welded part 11 and the second welded part 21 are connected by the brazing layer 13. The brazing layer 13 can achieve the welded connection between the first welded part 11 and the second welded part 21 through metallurgical bonding, and can also buffer stress through plastic deformation, reducing stress concentration after welding. Especially when the first metal part 10 and the second metal part 20 are made of different materials, the brazing layer 13 can ensure good welding of the first welded part 11 and the second welded part 21, and ensure the connection strength.
[0042] In some embodiments, the thickness of the brazing layer 13 in the thickness direction of the top cover assembly 100 is 0.05mm-3mm. When the thickness of the brazing layer 13 is set to 0.05mm-3mm, sufficient brazing filler metal can be ensured, the welding strength between the first welding part 11 and the second welding part 21 can be improved, and the welding efficiency can be improved, thereby reducing the overall assembly efficiency of the top cover assembly 100.
[0043] For example, the thickness of the brazing layer 13 in the thickness direction of the top cover assembly 100 can be 0.05 mm, 0.1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.
[0044] In some embodiments, such as Figure 3 As shown, the second metal part 20 is a ring structure with an outer diameter of D. A welding surface 111 is formed between the first welding part 11 and the second welding part 21. The width of the welding surface 111 in the radial direction of the second metal part 20 is W, which satisfies: 10% ≤ W / D ≤ 40%.
[0045] By satisfying the requirement of 10% ≤ W / D ≤ 40%, sufficient contact area can be provided on the welding surface 111 to effectively disperse mechanical stress, reduce weld cracking or detachment, and balance the amount of solder used, thus controlling welding costs. Furthermore, by satisfying the requirement of 10% ≤ W / D ≤ 40%, sufficient space can be reserved on the top cover assembly 100 to accommodate other structures (such as explosion-proof valves, raised structures 22, etc.).
[0046] For example, the W / D ratio can be 10%, 15%, 20%, 25%, 30%, 35%, or 40%.
[0047] In some embodiments, W ≥ 1.8 mm. When the width W of the weld surface 111 in the radial direction of the second metal part 20 is 1.8 mm or more, it facilitates welding, improves the shear and tensile strength between the first weld portion 11 and the second weld portion 21, and meets the strength requirements of the top cover assembly 100. Furthermore, when the width of the weld surface 111 in the radial direction of the second metal part 20 is 1.8 mm or more, it also ensures a sealing connection between the first metal part 10 and the second metal part 20, reducing the risk of electrolyte leakage from the top cover assembly 100.
[0048] In some embodiments, such as Figure 1 and Figure 3 As shown, the top cover assembly 100 also includes a terminal post 30 and a first insulating member 40. The terminal post 30 is sleeved inside the first metal member 10, and the first insulating member 40 is disposed between the first metal member 10 and the terminal post 30. The terminal post 30 acts as a bridge between the battery cell and the external circuit, carrying the charging and discharging current. By sleeved the terminal post 30 inside the first metal member 10 and disposed of the first insulating member 40 between the first metal member 10 and the terminal post 30, the terminal post 30 can be connected to other components in the top cover assembly 100 as a whole, improving the stability of the connection. At the same time, the first insulating member 40 can be used to achieve insulation isolation between the terminal post 30 and the first metal member 10, preventing short circuits and improving safety performance. The first insulating member 40, disposed between the first metal member 10 and the terminal post 30, also provides a sealing effect, preventing electrolyte and other substances from leaking from the gap between the first metal member 10 and the terminal post 30. Furthermore, the first insulating member 40 can reduce heat transfer between the pole post 30 and the first metal member 10, reduce local overheating in the top cover assembly 100, and provide thermal insulation. The first insulating member 40 can also improve the connection stability between the components by being sleeved between the first metal member 10 and the pole post 30.
[0049] In some embodiments, the first insulating member 40 is made of glass. The glass-material first insulating member 40 has higher electrochemical stability and more reliable sealing, improving sealing effectiveness and stability, and extending the service life of the top cover assembly 100. The battery casing 200 is generally made of aluminum or aluminum alloy, but aluminum and aluminum alloys have low melting points. When using glass seals, to facilitate the molding of the glass seals, materials with higher melting points (such as stainless steel) are used to make the terminal post 30 and the first metal member 10. Therefore, the top cover assembly 100 contains first metal members 10 and second metal members 20 made of different materials. In this embodiment, by welding the first metal member 10 and the second metal member 20 together and leaving a welding gap 12, the connection stability between the first metal member 10 and the second metal member 20 can be ensured.
[0050] In some embodiments, such as Figure 1 As shown, the top cover assembly 100 also includes a second insulating member 50. The second insulating member 50 is disposed circumferentially around the periphery of the terminal post 30, and covers one side of the first metal member 10, the second metal member 20, and the first insulating member 40. The second insulating member 50 can form an insulating barrier between the first metal member 10 and the second metal member 20 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.
[0051] In some embodiments, the second insulating member 50 is provided with a snap-fit portion 51, and the second insulating member 50 is snapped into the second metal member 20 through the snap-fit portion 51 to fix the second insulating member 50 to the second metal member 20 and improve the stability of the second insulating member 50.
[0052] For example, the second insulating element 50 can be a plastic sealant, which can serve as an insulator and sealant to prevent the first metal element 10 and the second metal element 20 from contacting the electrolyte and the connecting piece, thereby reducing the risk of short circuit.
[0053] Secondly, embodiments of this application provide a battery including the top cover assembly 100 as described above.
[0054] The beneficial effects of the battery provided in this application embodiment compared to the prior art are basically the same as those of the top cover assembly 100 described above, and will not be repeated here.
[0055] In some embodiments, the battery further includes a housing 200, one end of which has an opening, and a top cover assembly 100 is disposed at the opening of the housing 200. The top cover assembly 100 and the housing 200 cooperate to form a receiving cavity capable of accommodating materials such as the battery core and electrolyte.
[0056] 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, It includes a first metal part and a second metal part, wherein the second metal part is disposed around the periphery of the first metal part; The first metal part has a first welding part on the side near the second metal part, and the second metal part has a second welding part on the side near the first metal part. The first welding part and the second welding part are stacked along the thickness direction of the top cover assembly, and the first welding part and the second welding part are welded together. A welding gap is provided between the first welding part and the second metal part, and the welding gap is arranged around the periphery of the first welding part.
2. The top cover assembly according to claim 1, characterized in that, The second metal part is also provided with a protruding structure, which protrudes along the thickness direction of the top cover assembly; The welding gap is located between the first welded portion and the protruding structure.
3. The top cover assembly according to claim 2, characterized in that, The maximum width between the protruding structure and the outer peripheral surface of the first welded part is d, where 0mm < d < 1.5mm.
4. The top cover assembly according to claim 3, characterized in that, The minimum thickness of the second metal part at the protruding structure is H1, and the maximum thickness of the second metal part is H2, where 0.4H2 < H1 < H2.
5. The top cover assembly according to claim 1, characterized in that, A brazing layer is provided between the first welding part and the second welding part, and the first welding part and the second welding part are connected through the brazing layer.
6. The top cover assembly according to claim 5, characterized in that, The thickness of the brazing layer in the thickness direction of the top cover assembly is 0.05mm-3mm.
7. The top cover assembly according to claim 1, characterized in that, The second metal part is a ring structure with an outer diameter of D. A welding surface is formed between the first welding part and the second welding part. The width of the welding surface in the radial direction of the second metal part is W, which satisfies: 10% ≤ W / D ≤ 40%.
8. The top cover assembly according to claim 7, characterized in that, W≥1.8mm.
9. The top cover assembly according to any one of claims 1-8, characterized in that, The top cover assembly also includes a pole post and a first insulating element; The pole is sleeved inside the first metal part, and the first insulating part is disposed between the first metal part and the pole.
10. The top cover assembly according to claim 9, characterized in that, The first insulating element is made of glass.
11. The top cover assembly according to claim 10, characterized in that, The top cover assembly also includes a second insulating element; The second insulating member is disposed around the periphery of the pole post, and the second insulating member covers one side of the first metal member, the second metal member, and the first insulating member.
12. A battery, characterized in that, Includes the top cover assembly as described in any one of claims 1-11.