Copper-aluminum composite riveted top cover sheet and lightweight cover plate thereof

Abstract

This utility model provides a copper-aluminum composite riveted top cover and its lightweight cover plate. The copper-aluminum composite riveted top cover includes a long plate-shaped body with a through-hole, a base plate, and a sleeve. The base plate is plate-shaped and made of aluminum, while the sleeve is cylindrical and made of copper. The base plate is fixedly connected to the plate body and has a through-hole. The sleeve is embedded in the through-hole and fixedly connected to the base plate. The first connection hole communicates with the sleeve. The lightweight cover plate includes a top cover, a lower plastic part, and a post. The base plate has a protruding boss along its length. The first connection hole is located at the end of the boss. The upper part of the lower plastic part contacts the lower surface of the cover plate. The post passes through and connects to the boss and the lower plastic part. This copper-aluminum composite riveted top cover has low cost, and this lightweight cover plate is both low-cost and possesses sufficient strength.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, specifically to a copper-aluminum composite riveted top cover and its lightweight cover plate. Background Technology

[0002] A battery cover typically refers to a component used to enclose and protect the internal structure of a battery. It plays a crucial role in ensuring the battery's safety, airtightness, and overall performance.

[0003] To ensure the strength and conductivity of the top cover plate in the battery cover, a copper-aluminum composite plate is typically used. Currently, the price of copper-aluminum composite plates on the market is calculated based on the price of pure copper, resulting in high material costs, minimum order quantity requirements, and the need for special production for different specifications and sizes.

[0004] In copper-aluminum composite panels, the copper content is less than the aluminum content. Therefore, purchasing copper and aluminum plates separately can significantly reduce procurement costs. However, the key challenge lies in how to combine the copper and aluminum plates together. A common method is to press the aluminum and copper plates together using specialized rolling equipment. However, most companies do not possess rolling equipment, forcing them to purchase expensive copper-aluminum composite panels.

[0005] To address these issues, copper and aluminum plates can be welded together using laser welding. However, due to the significant difference in melting points between aluminum and copper, their metallurgical incompatibility leads to the formation of brittle compounds after welding. Furthermore, the large difference in thermophysical properties can cause welding instability, susceptibility to porosity and cracks, and other problems, affecting the strength and reliability of the weld joint. The complex process parameters also make control difficult.

[0006] At the same time, because the lower plastic is relatively thin, its strength is insufficient, ultimately resulting in the entire battery cover having a low strength defect. Utility Model Content

[0007] The first objective of this invention is to address the aforementioned problems in the existing technology by providing a copper-aluminum composite riveted top cover that is relatively low in cost and has a compact structure.

[0008] The second objective of this invention is to provide a lightweight cover plate using the aforementioned copper-aluminum composite riveted cover plate.

[0009] To achieve the first objective, this utility model can be implemented through the following technical solutions:

[0010] A copper-aluminum composite riveted top cover includes a plate body in the shape of a long plate, the plate body having a through connection hole one, characterized in that it further includes a base plate and a sleeve, the base plate being plate-shaped and made of aluminum, the sleeve being cylindrical and made of copper, the base plate being fixedly connected to the plate body, the base plate having a through connection hole two, the sleeve being embedded in the connection hole two and fixedly connected to the base plate, the connection hole one communicating with the sleeve.

[0011] In the aforementioned copper-aluminum composite riveted top cover, the upper end of the second connecting hole has an annular recessed stepped seat one, and the outer side of the sleeve has an annular protruding retaining edge that matches the stepped seat one. The retaining edge is embedded in one part of the stepped seat.

[0012] In the aforementioned copper-aluminum composite riveted top cover, the sleeve has a protruding stepped seat II.

[0013] In the aforementioned copper-aluminum composite riveted top cover, the upper end of the sleeve is flush with the upper end of the substrate.

[0014] The aforementioned copper-aluminum composite riveted top cover also includes an upper plastic layer, which is pressed tightly between the plate and the substrate.

[0015] In the aforementioned copper-aluminum composite riveted top cover, the upper plastic has a through clearance hole that is directly opposite to a connecting hole, and the inner edge of the upper plastic has a downward protruding connecting edge that is embedded between the pole and the side wall of the connecting hole in the plate.

[0016] In the aforementioned copper-aluminum composite riveted top cover, the outer edge of the upper plastic has an upwardly protruding connecting edge two, which abuts against the edge of the substrate.

[0017] To achieve the second objective, this utility model can be implemented through the following technical solutions:

[0018] A lightweight cover plate is characterized in that it includes a top cover plate, a lower plastic and an electrode post. A protruding boss is provided on the substrate along its length direction. The first connecting hole is located at the end of the boss. The upper part of the lower plastic contacts the lower surface of the cover plate. The electrode post is inserted and connected to the boss and the lower plastic. Both ends of the lower part of the lower plastic have a first reinforcing structure. A second reinforcing structure is provided between the two first reinforcing structures in the lower plastic. The strength of the lower plastic can be increased by the first and second reinforcing structures.

[0019] In the aforementioned lightweight cover plate, the upper edge of the protrusion has a smooth transition portion.

[0020] In the aforementioned lightweight cover plate, the transition portion is a rounded corner at the edge of the boss.

[0021] In the aforementioned lightweight cover plate, the transition portion is a chamfer at the corner of the boss.

[0022] In the aforementioned lightweight cover plate, the first reinforcing structure consists of several horizontally arranged ribs 1 and several vertically arranged ribs 2 at the lower plastic end, and the second reinforcing structure consists of several horizontally arranged ribs 3 and several vertically arranged ribs 4 in the middle of the lower plastic. The spacing between two adjacent ribs 1 and two adjacent ribs 2 is in the range of A-B, and the spacing between two adjacent ribs 3 and two adjacent ribs 4 is in the range of C-D, where C is greater than A and B, and D is greater than C.

[0023] Compared to existing technologies, this copper-aluminum composite riveted top cover plate utilizes ultrasonic torque welding of copper and aluminum, resulting in high weld strength. Furthermore, it avoids the use of third-party metals, preventing their influence on the resistivity and ensuring extremely low resistivity in the welded copper-aluminum block, thus maintaining excellent electrical conductivity. Simultaneously, the heat-affected zone is small; the welding process only involves localized heating of the copper and aluminum plates, minimizing the overall thermal impact on the workpiece and reducing the impact of thermal deformation and material properties. Moreover, purchasing and welding the copper and aluminum blocks separately significantly reduces costs, effectively lowering the overall cost of the cover plate.

[0024] In addition, a raised surface is provided in the middle of the cover plate, which reduces the thickness of the lower plastic layer while adding two reinforcement structures to its surface. These two reinforcement structures improve the strength of the lower plastic layer and provide stable support for the cover plate, enabling it to withstand greater pressure and impact. Moreover, the combination of a sleeve and an aluminum block replaces the traditional copper-aluminum composite block, reducing the proportion of copper and further reducing the overall weight of the cover plate, thus possessing high practical value. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the copper-aluminum composite riveted top cover plate.

[0026] Figure 2 This is a top view schematic diagram of the copper-aluminum composite riveted top cover plate.

[0027] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure along the A-A direction.

[0028] Figure 4 yes Figure 3 A schematic diagram of the local structure at point B.

[0029] Figure 5 This is a schematic diagram of the three-dimensional structure of the plastic.

[0030] Figure 6 This is a three-dimensional structural diagram of the connection between the substrate and the sleeve.

[0031] Figure 7 This is a cross-sectional view of the connection between the substrate and the sleeve.

[0032] In the picture:

[0033] 1. Plate body; 1a. Connecting hole one; 2. Base plate; 2a. Connecting hole two; 2a1. Step seat one; 2b. Boss; 2b1. Transition part; 3. Sleeve; 3a. Stop edge; 3b. Step seat two; 4. Upper plastic; 4a. Clearance hole; 4b. Connecting edge one; 4c. Connecting edge two; 5. Cover plate; 6. Lower plastic; 7. Pole post; 8. Rib one; 9. Rib two; 10. Rib three; 11. Rib four. Detailed Implementation

[0034] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0035] like Figure 1-7 As shown, this copper-aluminum composite riveted top cover includes a plate body 1 in the shape of a long plate, the plate body 1 having a through connection hole 1a, a base plate 2 and a sleeve 3. The base plate 2 is plate-shaped and made of aluminum, and the sleeve 3 is cylindrical and made of copper. The base plate 2 is fixedly connected to the plate body 1, and the base plate 2 has a through connection hole 2a. The sleeve 3 is embedded in the connection hole 2a and is fixedly connected to the base plate 2. The connection hole 1a communicates with the sleeve 3.

[0036] The sleeve 3 is fixedly connected to the base plate 2 by welding. Since the amount of sleeve 3 is relatively small compared to the amount of base plate 2, it ensures sufficient strength at the pole connection of the cover plate while ensuring the overall strength of the cover plate.

[0037] The upper end of the connecting hole 2a has an annular recessed step seat 2a1, and the outer side of the sleeve 3 has an annular protruding flange 3a that matches the step seat 2a1. The flange 3a is embedded in the step seat 2a1.

[0038] The step seat 2a1 and the retaining edge 3a can improve the connection stability between the sleeve 3 and the base plate 2.

[0039] The sleeve 3 has a protruding stepped seat 3b inside.

[0040] Stepped seat 3b is used to match the pole post. This structure allows the pole post 7 to be stably connected inside the sleeve 3.

[0041] The upper end of the sleeve 3 is flush with the upper end of the substrate 2.

[0042] This structure can appropriately improve the overall structural compactness of the cover plate.

[0043] The specific welding steps between substrate 2 and sleeve 3 are as follows:

[0044] Step S1: Punch out a second connection hole 2a on the aluminum substrate 2. The second connection hole 2a is a stepped hole.

[0045] Step S2: Perform surface pretreatment on the processed substrate 2 and observe whether there is any damage to the surface of the pretreated substrate 2. Specifically, first clean the surface of the substrate 2 with a neutral or weak alkaline cleaning agent, then place the substrate 2 in a drying equipment to dry its surface and wipe away water stains to keep the surface of the substrate 2 clean and free of foreign matter.

[0046] Step S3: Substrates 2 that meet the testing standards are packaged and await further processing; substrates that do not meet the testing standards are scrapped.

[0047] Step S4: Machining the copper sleeve 3 so that its outer contour is the same as the inner contour of the connecting hole 2a; at the same time, machining the stepped seat 3b inside the sleeve 3.

[0048] Step S5: Perform surface pretreatment on the surface of the processed sleeve 3 and observe whether there is any damage to the surface of the pretreated sleeve 3; specifically, perform pickling treatment on the surface of the processed sleeve 3 to remove the surface oxide layer, and place the pickled sleeve 3 in a drying equipment to dry and wipe off water stains; then perform nickel plating treatment on the surface of the sleeve 3.

[0049] Step S6: Sleeves 3 that meet the testing standards are packaged and await further processing; sleeves that do not meet the testing standards are scrapped.

[0050] Step S7: Place the sleeve 3 in the second connection hole of the substrate 2, and weld the sleeve 3 and the substrate 2 together using an ultrasonic torque welding device to form a copper-aluminum composite block;

[0051] Step S8: Observe the surface of the copper-aluminum composite block for any damage;

[0052] Step S9: Copper-aluminum composite blocks that meet the testing standards are packaged, registered, and put into storage; copper-aluminum composite blocks that do not meet the testing standards are scrapped.

[0053] The sleeve 3 and the base plate 2 are welded together by ultrasonic torque welding. This welding method allows the strength of the weld to approach that of the base material. Furthermore, no metal filler is used during welding, thus avoiding the increase in resistivity caused by filler metal, maintaining a low resistivity and good conductivity on the welded copper-aluminum joint.

[0054] It also includes an upper plastic 4, which is pressed tightly between the plate 1 and the substrate 2.

[0055] The plastic 4 can achieve insulation between the substrate 2 and the plate 1;

[0056] The upper plastic 4 has a through clearance hole 4a that is directly opposite the connecting hole 1a. The inner edge of the upper plastic 4 has a downward protruding connecting edge 4b, which is embedded between the pole post 7 and the side wall of the connecting hole 1a of the plate 1.

[0057] The clearance hole 4a allows the pole post 7 to be smoothly inserted and connected to the plate 1. At the same time, the connecting edge 4b ​​can effectively improve the connection stability between the pole post 7 and the plate 1. In other words, the connecting edge 4b ​​plays a guiding role during the assembly process, ensuring that it is assembled in place.

[0058] The outer edge of the upper plastic 4 has an upwardly protruding connecting edge 4c, which abuts against the edge of the substrate 2.

[0059] Connecting edge 4c covers the edge of substrate 2, providing appropriate protection for substrate 2. Similarly, during assembly, connecting edge 4c serves a similar function to connecting edge 4b, facilitating assembly positioning.

[0060] This lightweight cover plate includes a top cover sheet, a lower plastic 6, and an electrode post 7. The base plate 2 has a protruding boss 2b along its length direction. The aforementioned connecting hole 2a is located at the end of the boss 2b. The upper part of the lower plastic 6 is in contact with the lower surface of the cover plate 5. The aforementioned electrode post 7 passes through and connects to the boss 2b and the lower plastic 6. The lower plastic 6 has a first reinforcement structure at both ends. Between the two first reinforcement structures, the lower plastic 6 has a second reinforcement structure. The strength of the lower plastic 6 can be increased by the first reinforcement structure and the second reinforcement structure.

[0061] The edge of the lower plastic 6 is flush with the edge of the plate 1.

[0062] Since the lower plastic 6 is fixed to the lower part of the plate 1, the lower plastic 6, which is relatively thin, can also have appropriate strength under the action of the first and second reinforcement structures.

[0063] The upper edge of the boss 2b has a smooth transition portion 2b1.

[0064] The transition portion 2b1 is a rounded corner at the edge of the boss. Depending on the actual situation, it is also feasible to make the transition portion 2b1 a chamfer at the edge of the boss.

[0065] The transition section effectively eliminates sharp edges and corners on the boss.

[0066] The first reinforcement structure consists of several horizontally arranged ribs 8 and several vertically arranged ribs 9 at the end of the lower plastic 6. The second reinforcement structure consists of several horizontally arranged ribs 10 and several vertically arranged ribs 11 in the middle of the lower plastic. The spacing between two adjacent ribs 8 and two adjacent ribs 9 is A-B, and the spacing between two adjacent ribs 10 and two adjacent ribs 11 is C-D, where C is greater than A and B, and D is greater than C.

[0067] Values ​​A and B are both relatively small, while values ​​C and D are both relatively large. This means that the spacing between adjacent ribs one and two in the lower plastic end reinforcement structure is relatively small. Conversely, the spacing between adjacent ribs three and four in the lower plastic middle reinforcement structure is relatively large. This structure effectively ensures high strength at the lower plastic end while also providing adequate strength in the lower plastic middle.

[0068] Since the first reinforcement structure provides sufficient strength at the lower plastic end, the strength in the middle of the lower plastic is always sufficient. Therefore, the spacing between adjacent ribs in the second reinforcement structure is appropriately large, which reduces the number of ribs while ensuring its strength.

[0069] This copper-aluminum composite riveted cover plate utilizes ultrasonic torque welding of copper and aluminum, resulting in high weld strength. Furthermore, it avoids the use of third-party metals, preventing their influence on the resistivity and ensuring extremely low resistivity in the welded copper and aluminum blocks, thus maintaining excellent electrical conductivity. Simultaneously, the heat-affected zone is small; the welding process only involves localized heating of the copper and aluminum plates, minimizing the overall thermal impact on the workpiece and reducing the impact of thermal deformation and material properties. Moreover, purchasing and welding the copper and aluminum blocks separately significantly reduces costs, effectively lowering the overall cost of the cover plate.

[0070] In addition, a raised surface is provided in the middle of the cover plate, which reduces the thickness of the lower plastic layer while adding two reinforcement structures to its surface. These two reinforcement structures improve the strength of the lower plastic layer and provide stable support for the cover plate, enabling it to withstand greater pressure and impact. Moreover, the combination of a sleeve and an aluminum block replaces the traditional copper-aluminum composite block, reducing the proportion of copper and further reducing the overall weight of the cover plate, thus possessing high practical value.

[0071] The above-described technical solution of this utility model addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The parts not covered in this application's technical solution are the same as or can be implemented using existing technologies, and will not be described in detail here.

[0072] The technical solutions in the above embodiments have clearly and completely described the content of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A copper-aluminum composite riveted top cover sheet comprising a plate body in a long plate shape, the plate body having a through connection hole 1, characterized in that, It also includes a substrate and a sleeve. The substrate is plate-shaped and made of aluminum, and the sleeve is cylindrical and made of copper. The substrate is fixed to the plate. The substrate has a through connection hole two. The sleeve is embedded in the connection hole two and is fixedly connected to the substrate. The connection hole one communicates with the sleeve.

2. The copper-aluminum composite riveted cap sheet according to claim 1, characterized in that The upper end of the second connecting hole has an annular recessed stepped seat, and the outer side of the sleeve has an annular protruding retaining edge that matches the stepped seat. The retaining edge is embedded in the stepped seat.

3. The copper-aluminum composite riveted cap sheet according to claim 1, characterized in that The sleeve has a protruding stepped seat.

4. The copper-aluminum composite riveted cap sheet according to claim 1, wherein, The upper end of the sleeve is flush with the upper end of the substrate.

5. The copper-aluminum composite riveted cap sheet according to claim 1, wherein, It also includes an upper plastic layer, which is pressed tightly between the plate and the substrate.

6. The copper-aluminum composite riveted cap sheet according to claim 5, characterized in that The upper plastic has a through clearance hole that is directly opposite to a connecting hole. The inner edge of the upper plastic has a downward protruding connecting edge that is embedded between the pole and the side wall of the connecting hole in the plate.

7. The copper-aluminum composite riveted cap sheet according to claim 5, characterized in that The outer edge of the upper plastic has an upwardly protruding connecting edge two, which abuts against the edge of the substrate.

8. A lightweight cover plate characterized by, The device includes a top cover, a lower plastic, and an electrode post as described in any one of claims 1-7. A protruding boss is provided on the substrate along its length direction. The first connecting hole is located at the end of the boss. The upper part of the lower plastic contacts the lower surface of the cover plate. The electrode post is inserted and connected to the boss and the lower plastic. Both ends of the lower part of the lower plastic have a first reinforcing structure. A second reinforcing structure is provided between the two first reinforcing structures in the lower plastic. The strength of the lower plastic can be increased by the first and second reinforcing structures.

9. The light-weight cover plate of claim 8, wherein, The upper edge of the boss has a smooth transition section.

10. The light-weight cover plate according to claim 8 or 9, characterized in that The first reinforcing structure consists of several horizontally arranged ribs 1 and several vertically arranged ribs 2 at the lower plastic end. The second reinforcing structure consists of several horizontally arranged ribs 3 and several vertically arranged ribs 4 in the middle of the lower plastic. The spacing between two adjacent ribs 1 and two adjacent ribs 2 is A-B, and the spacing between two adjacent ribs 3 and two adjacent ribs 4 is C-D, where C is greater than A and B, and D is greater than C.

Images