Floating assembly tool for assembling battery cover plate

Abstract

The utility model relates to new energy battery processing equipment technical field, concretely relates to battery apron assembly is with floating type assembly tool, through installing reset spring between workpiece support plate and base body, forms a floating tool, when ultrasonic welding, workpiece support plate can sink and avoid the position, makes the top head and material to fit, after welding is completed, utilizes reset spring and lifts workpiece support plate, passes through the top head pressure transmission downward, under the condition of not influencing to workpiece positioning, avoids the damage that welding tool appears after being impacted by welding pressure when welding, has the gap one between workpiece support plate and base body in advance, has the gap two between the upper end surface of top head and the upper end surface of workpiece support plate in advance, the height of gap one is greater than the height of gap two, and the lower part of top head is provided with guide rod, and the guide column can directly transmit the pressure during welding to the receiving stand column, avoids the abrasion or deformation that swivel plate appears after being stressed in the welding station.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery processing equipment technology, specifically to a floating assembly fixture for assembling battery cover plates. Background Technology

[0002] In the manufacturing process of various batteries such as lithium-ion batteries and power batteries, the assembly of the battery cover is one of the key processes to ensure the battery's sealing performance, electrical connection reliability, and overall structural stability. Among these processes, ultrasonic welding technology is widely used for connecting battery covers to terminals, connecting pieces, and other materials due to its advantages such as high welding efficiency, small heat-affected zone, and no need for additional solder. The welding quality directly determines the battery's safety and lifespan.

[0003] Ultrasonic welding requires precise positioning of the battery cover plate using assembly fixtures to ensure the welding mandrel and material are in the correct positions. Currently, the industry commonly uses rigid fixtures, where the workpiece support plate is fixedly connected to the base. While this provides initial positioning, it has significant drawbacks: First, when the welding mandrel applies pressure, the pressure is directly transmitted to the rigid fixture, preventing the support plate from adapting to displacement. This causes the fixture to withstand impacts exceeding its tolerance, leading to positioning misalignment, structural deformation, or even breakage over long-term use. This increases maintenance costs and can also cause welding deviations, affecting assembly pass rates. Second, due to workpiece tolerances, assembly clearances, and material deformation, rigid fixtures cannot ensure complete contact between the mandrel and the material. Increasing pressure exacerbates fixture damage, while decreasing pressure results in insufficient weld strength, creating a vicious cycle.

[0004] In addition, although some tooling uses elastic elements to mitigate impact, improper installation or connection methods either prevent the pallet from sinking and avoiding displacement or compromise positioning accuracy, thus failing to resolve the core contradiction between positioning and protection.

[0005] Therefore, developing tooling that can guarantee positioning accuracy and enable the pallet to self-avoid positioning is an urgent problem to be solved in the industry. Utility Model Content

[0006] To address the aforementioned issues, this utility model provides a floating assembly fixture for assembling battery covers. By installing a return spring between the workpiece support plate and the base, a floating fixture is formed. During ultrasonic welding, the workpiece support plate can sink to avoid displacement, allowing the top head to fit against the material. After welding, the return spring lifts the workpiece support plate, and the pressure from the top head is transmitted downwards. This avoids damage to the welding fixture from the impact of welding pressure during welding without affecting the positioning of the workpiece.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a floating assembly fixture for assembling battery cover plates, including a frame, a rotary table above the frame, a welding device on one side of the rotary table, and a welding fixture for use with the welding device on the rotary table.

[0008] The welding fixture includes a base, a workpiece support plate is disposed within the base, a return spring is disposed between the workpiece support plate and the base, and a top is disposed in the middle of the workpiece support plate.

[0009] As a further improvement to the above technical solution:

[0010] A first gap is reserved between the workpiece support plate and the base body, and a second gap is reserved between the upper end face of the top head and the upper end face of the workpiece support plate. The height of the first gap is greater than the height of the second gap.

[0011] The upper part of the base is provided with a storage groove, the middle part of the storage groove is provided with a through hole, and a limiting boss is provided in the through hole.

[0012] The upper surface of the workpiece support plate is provided with a positioning post, and the lower surface is provided with a guide block that cooperates with the through hole. The workpiece support plate is provided with a guide hole that passes through the guide block.

[0013] The lower part of the top head is provided with a guide rod, and an axial retaining ring is provided on the guide rod located below the limiting boss.

[0014] The welding fixture is an ultrasonic welding machine. A base is provided below the ultrasonic welding machine, and a receiving column corresponding to the position of the guide rod is provided on the base.

[0015] The rotary table is provided with a clearance hole corresponding to the position of the guide rod, and a sliding sleeve is provided in the clearance hole.

[0016] The number of reset springs is multiple and they are evenly distributed along the circumference of the top.

[0017] The beneficial effects of this utility model embodiment are as follows: The floating assembly fixture for battery cover assembly forms a floating fixture by installing a return spring between the workpiece support plate and the base. During ultrasonic welding, the workpiece support plate can sink to avoid displacement, so that the top head fits with the material. After welding, the return spring is used to lift the workpiece support plate and transmit the pressure downward through the top head. Without affecting the positioning of the workpiece, the welding fixture is prevented from being damaged by the impact of welding pressure during welding.

[0018] A first gap is reserved between the workpiece support plate and the base, and a second gap is reserved between the upper end face of the mandrel and the upper end face of the workpiece support plate. The height of the first gap is greater than the height of the second gap. A guide rod is provided at the lower part of the mandrel. The guide rod can directly transmit the pressure during welding to the receiving column, so as to avoid wear or deformation of the turntable after it is subjected to force at the welding station. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the present invention;

[0021] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0022] Figure 4 This is a schematic diagram of the welding fixture in this utility model;

[0023] Figure 5 This is a cross-sectional view of the welding fixture in this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the substrate in this utility model.

[0025] In the diagram: 1. Frame; 2. Rotary table; 3. Welding equipment; 4. Welding fixture; 5. Base; 6. Workpiece support plate; 7. Return spring; 8. Top head; 9. Storage slot; 10. Through hole; 11. Limiting boss; 12. Positioning post; 13. Guide block; 14. Guide hole; 15. Gap 1; 16. Gap 2; 17. Guide rod; 18. Axial retaining ring; 19. Base; 20. Support column; 21. Alternating hole; 22. Sliding sleeve. Detailed Implementation

[0026] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0027] like Figure 1-6As shown, the floating assembly fixture for assembling the battery cover in this embodiment includes a frame 1, a rotary table 2 mounted on top of the frame 1, a welding device 3 mounted on one side of the rotary table 2, and a welding fixture 4 for use with the welding device 3 on the rotary table 2. The welding fixture 4 includes a base 5, a workpiece support plate 6 inside the base 5, a return spring 7 between the workpiece support plate 6 and the base 5, and a top head 8 in the middle of the workpiece support plate 6. By installing the return spring between the workpiece support plate and the base, a floating fixture is formed. During ultrasonic welding, the workpiece support plate can sink to avoid displacement, allowing the top head to fit against the material. After welding, the return spring lifts the workpiece support plate, and the pressure is transmitted downward through the top head. Without affecting the positioning of the workpiece, the welding fixture is protected from damage caused by the impact of welding pressure during welding.

[0028] A gap 15 is reserved between the workpiece support plate 6 and the base 5, and a gap 16 is reserved between the upper end face of the mandrel 8 and the upper end face of the workpiece support plate 6. The height of gap 15 is greater than the height of gap 16. The height of gap 15 is 2mm, and the height of gap 16 is 1.5mm. During the welding process, the workpiece support plate 6 sinks after the welding fixture is pressed down. After the workpiece support plate sinks 1.5mm, the mandrel 8 begins to bear force. At this time, there is still a 0.5mm gap between the workpiece support plate 6 and the base 5, so they will not collide with each other, reducing the wear of the welding fixture. At the same time, the pressure on the mandrel 8 is transmitted to the frame 1 through the guide rod 17, ensuring that the pressure between the workpiece and the mandrel is sufficient to complete the welding operation, preventing the rotary table 2 from tilting or deforming after bearing the welding pressure, and extending the service life of the rotary table 2.

[0029] The upper part of the base 5 is provided with a storage groove 9, the middle part of the storage groove 9 is provided with a through hole 10, and a limiting boss 11 is provided in the through hole 10. The upper surface of the workpiece support plate 6 is provided with a positioning post 12 for limiting and guiding the material during assembly. The lower surface is provided with a guide block 13 that cooperates with the through hole 10. The workpiece support plate 6 is provided with a guide hole 14 that passes through the guide block 13. The upper end of the guide hole 14 is provided with a countersunk hole for placing the top head 8. The lower part of the top head 8 is provided with a guide rod 17. The guide rod 17 is provided with an axial retaining ring 18 located below the limiting boss 11. The diameter of the countersunk hole is larger than the diameter of the guide hole 14. The bottom of the countersunk hole supports the top head 8 to prevent the top head 8 from sinking excessively. The axial retaining ring 18 limits the rising height of the top head 8 when the return spring 7 is reset, ensuring that the height of the gap 17 remains unchanged.

[0030] The welding fixture 4 uses an ultrasonic welding machine. The ultrasonic welding machine has a base 19 at the bottom and a support column 20 on the base 19 corresponding to the position of the guide rod 17. During welding, the welding pressure is transmitted to the frame 1 by the guide rod 17 and the support column 20, so as to avoid the rotary table 2 being directly subjected to force.

[0031] The rotary table 2 is provided with a clearance hole 21 corresponding to the position of the guide rod 17. A sliding sleeve 22 is provided in the clearance hole 21. The bushing 22 serves as a guide and is also a wear part that is detachably connected to the clearance hole, making it convenient to replace after wear.

[0032] The number of return springs 7 is multiple and they are evenly distributed along the circumference of the top head 8. The multiple return springs 7 are symmetrically distributed in pairs with the center line of the top head 8 as the axis, which ensures that the workpiece support plate 6 is subjected to balanced force around its perimeter when it sinks or rises, and there will be no skewing.

[0033] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0036] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A floating assembly fixture for assembling battery cover plates, characterized in that: Includes a frame (1), a rotary table (2) is provided above the frame (1), a welding device (3) is provided on one side of the rotary table (2), and a welding fixture (4) is provided on the rotary table (2) to cooperate with the welding device (3); The welding fixture (4) includes a base (5), a workpiece support plate (6) is provided inside the base (5), a return spring (7) is provided between the workpiece support plate (6) and the base (5), and a top head (8) is provided in the middle of the workpiece support plate (6).

2. The floating assembly fixture for assembling the battery cover plate according to claim 1, characterized in that: A gap 1 (15) is reserved between the workpiece support plate (6) and the base (5), and a gap 2 (16) is reserved between the upper end face of the top head (8) and the upper end face of the workpiece support plate (6). The height of the gap 1 (15) is greater than the height of the gap 2 (16).

3. The floating assembly fixture for assembling the battery cover plate according to claim 1, characterized in that: The upper part of the base (5) is provided with a storage groove (9), the middle part of the storage groove (9) is provided with a through hole (10), and a limiting boss (11) is provided in the through hole (10).

4. The floating assembly fixture for assembling the battery cover plate according to claim 3, characterized in that: The upper surface of the workpiece support plate (6) is provided with a positioning post (12), and the lower surface is provided with a guide block (13) that cooperates with the through hole (10). The workpiece support plate (6) is provided with a guide hole (14) that passes through the guide block (13).

5. The floating assembly fixture for assembling the battery cover plate according to claim 4, characterized in that: The lower part of the top head (8) is provided with a guide rod (17), and the guide rod (17) is provided with an axial retaining ring (18) located below the limiting boss (11).

6. The floating assembly fixture for assembling a battery cover plate according to claim 1, characterized in that: The welding fixture (4) is an ultrasonic welding machine. A base (19) is provided below the ultrasonic welding machine. A receiving column (20) corresponding to the position of the guide rod (17) is provided on the base (19).

7. The floating assembly fixture for assembling a battery cover plate according to claim 1, characterized in that: The rotary table (2) is provided with a clearance hole (21) corresponding to the position of the guide rod (17), and a sliding sleeve (22) is provided in the clearance hole (21).

8. The floating assembly fixture for assembling a battery cover plate according to claim 1, characterized in that: The number of reset springs (7) is multiple and they are evenly distributed along the circumference of the top (8).

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