An adjustable battery module laser welding fixture

Abstract

This utility model discloses an adjustable laser welding fixture for battery modules, including a mounting plate, a welding head, a dust removal piping system, and a lifting mechanism. The mounting plate has countersunk grooves and toothed limiting grooves. A laterally adjustable welding head is connected via stepped bolts and limiting baffles, allowing it to adapt to different sizes and specifications. The welding head has a double-layer hollow structure, integrating a protective gas channel and a dust removal channel, enabling the protective gas to be evenly introduced into the welding area and the timely removal of fumes. The lifting mechanism drives the entire fixture to move up and down, achieving clamping and positioning. This utility model, through its modular and adjustable design, solves the problems of poor adaptability and high replacement costs of existing fixtures, improves the testing and production efficiency of laser welding of battery modules, and ensures a clean welding environment.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production and processing technology, specifically to an adjustable laser welding fixture for battery modules. Background Technology

[0002] Busbar laser welding is one of the key processes in the manufacturing of power batteries. Welding fixtures, as important auxiliary equipment, directly affect the quality and consistency of the welded products. Compared to ordinary welding fixtures, these fixtures need to possess multiple composite functions. In particular, their pressure head assembly, in addition to its basic functions of workpiece clamping and positioning, typically integrates auxiliary functions such as protective gas blowing and welding fume extraction to effectively prevent oxidation in the welding area and promptly remove dust and spatter generated during the welding process.

[0003] Since the welding pressure head integrates functions such as clamping, dust removal, and protective gas supply, its structural design is a crucial factor determining welding quality. In actual production, pressure heads are typically designed based on experience. Due to variations in operating conditions, welding defects caused by structural design flaws often require lengthy troubleshooting, redesign, and replacement processes, delaying production schedules. If different welding pressure heads with varying structures are thoroughly tested before on-site installation, and a pressure head that meets project requirements and meets quality standards is selected, the probability of defects arising from pressure head structural issues can be significantly reduced. To prevent the need to redesign the entire fixture every time the pressure head design or positioning distance is changed, the welding fixture must possess a certain degree of assembly adjustability to adapt to the testing requirements of different pressure head structures. Utility Model Content

[0004] The purpose of this utility model is to provide an adjustable laser welding fixture for battery modules, which aims to overcome the defects of the prior art and solve the problems of poor assembly adjustability and inability to adapt to different structural pressure heads of the existing welding fixture.

[0005] Therefore, this utility model proposes an adjustable laser welding fixture for battery modules, comprising:

[0006] The mounting plate has a plate body, on which a light-transmitting groove and a countersunk groove are provided;

[0007] Several welding pressure heads are connected to the countersunk groove via stepped bolts; the stepped bolts and the countersunk groove are clearance-fitted and can move along the countersunk groove to adjust their horizontal position, used to clamp the workpiece and provide a protective gas passage; and

[0008] Dust collection duct system used to collect welding fumes.

[0009] Preferably, the mounting plate includes a limiting baffle; the wall of the countersunk groove is provided with a toothed limiting groove; the limiting baffle can be inserted into the toothed limiting groove to limit the horizontal movement of the stepped bolt.

[0010] Preferably, the welding head is a double-layer structure formed by the fitting of an upper head and a lower head; the upper head has an internal cavity in the middle and a dust removal port on the side; the lower head has a protective air inlet and is connected to a miniature connector.

[0011] Preferably, a gap is formed at the bottom of the upper pressure head and the lower pressure head, so that the protective gas inlet is connected to the internal cavity of the upper pressure head.

[0012] Preferably, the upper pressure head and the lower pressure head have a wall-fitting air-blocking area on the side near the micro connector.

[0013] Preferably, the stepped bolt passes through the countersunk groove and the spring in sequence and is then connected to the upper pressure head; the spring is used to provide clamping force.

[0014] Preferably, the pressure plate body has two rows of light-transmitting grooves and two rows of countersunk grooves; the lower end of the corresponding mounting pressure plate is connected to two rows of welding heads; the light-transmitting grooves are positioned opposite to the internal cavities of the welding heads.

[0015] Preferably, the dust removal pipeline system includes dust removal branch pipes, dust removal integrated pipes, and a main dust removal interface; one end of the dust removal branch pipe is connected to the dust removal port of the welding head, and the other end is connected to the dust removal integrated pipe; the main dust removal interface is located at the end of the dust removal integrated pipe.

[0016] Preferably, one end of the mounting plate is connected to a lifting mechanism, which is connected to the reinforcing rib of the mounting plate and is used to control the overall displacement of the tooling in the vertical direction.

[0017] Preferably, the lifting mechanism is a lead screw type displacement table, including a lead screw module and a mounting plate; the lead screw module is connected to the mounting plate, and the mounting plate is connected to the mounting pressure plate through the reinforcing rib.

[0018] The adjustable battery module laser welding fixture provided by this utility model offers assembly flexibility through the design of countersunk grooves, toothed limiting grooves, and limiting baffles. It can accommodate welding heads of various sizes and can also be used with welding products of different positions, preventing frequent changes to the overall fixture during the testing phase, reducing processing costs and time, and improving testing and production efficiency. Furthermore, the design of the dust removal pipe and protective gas pipe on the same side saves space and avoids installation interference.

[0019] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a three-dimensional structural diagram of the adjustable battery module laser welding fixture of this utility model;

[0022] Figure 2 This is a partial enlarged view of point A of the adjustable battery module laser welding fixture of this utility model;

[0023] Figure 3 This is a top view of the adjustable battery module laser welding fixture of this utility model;

[0024] Figure 4 This is a partial enlarged view of section B of the adjustable battery module laser welding fixture of this utility model;

[0025] Figure 5 This is a bottom-view three-dimensional structural diagram of the adjustable battery module laser welding fixture of this utility model;

[0026] Figure 6 This is a three-dimensional structural diagram of the welding pressure head in the adjustable battery module laser welding fixture of this utility model;

[0027] Figure 7 This is a cross-sectional view of the welding pressure head in the adjustable battery module laser welding fixture of this utility model;

[0028] Explanation of reference numerals in the attached drawings: 1. Mounting pressure plate; 2. Welding pressure head; 3. Dust removal piping system; 4. Lifting mechanism; 11. Pressure plate body; 12. Reinforcing rib; 13. Limiting baffle; 14. Countersunk groove; 15. Light transmission groove; 21. Upper pressure head; 22. Lower pressure head; 23. Step bolt; 24. Spring; 25. Miniature connector; 26. Dust removal port; 27. Gap; 28. Internal cavity; 29. ​​Air blocking area; 31. Dust removal branch pipe; 32. Dust removal integrated pipe; 33. Main dust removal interface; 41. Lead screw module; 42. Mounting plate. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 7As shown, the adjustable battery module laser welding fixture of this utility model mainly consists of four parts: a mounting plate 1, several welding heads 2, a dust removal pipeline system 3, and a lifting mechanism 4. The mounting plate 1 is used for positioning and integrating the welding heads. The welding heads 2 act directly on the workpiece to eliminate gaps and provide protective gas and dust removal channels. The dust removal pipeline system 3 is used to collect fumes generated during welding, reducing the obstruction of the laser by smoke and maintaining a clean welding environment. The lifting mechanism 4 is connected to the mounting plate 1 via reinforcing ribs and is used to control the overall vertical displacement of the fixture.

[0031] like Figure 1 , Figure 2 As shown, the mounting plate 1 is connected to the welding head 2 and the lifting mechanism 4 respectively, and is composed of a plate body 11, a reinforcing rib 12 and a limiting baffle 13. Among them, the reinforcing rib 12 is used to connect the mounting plate 1 and the lifting mechanism 4, and control the movement of the mounting plate 1 in the vertical direction.

[0032] like Figures 1-4 As shown, a light-transmitting groove 15 is formed on the top of the pressure plate body 11 to provide a laser incident channel. Countersunk grooves 14 are provided on both sides of the light-transmitting groove 15, through which stepped bolts 23 pass and connect to the welding pressure head 2. The stepped bolts 23 can move linearly within the countersunk grooves 14 to match welding pressure heads of different sizes and installation spacing. Simultaneously, to prevent horizontal displacement of the stepped bolts 23 during operation, numerous toothed limiting grooves are provided on the wall of the countersunk grooves 14. After the welding pressure head is installed, the limiting baffles 13 are inserted into the toothed limiting grooves on both sides of the stepped bolts 23 to complete the installation and positioning of the welding pressure head 2. If precise positioning is required, higher precision adjustments can be achieved by manufacturing limiting baffles of various thicknesses or installing shims of different thicknesses on the limiting baffles.

[0033] like Figure 6 , Figure 7 As shown, the welding pressure head 2 has a double-layer structure, consisting of an upper pressure head 21, a lower pressure head 22, a stepped bolt 23, a spring 24, and a miniature connector 25. During installation, the upper pressure head 21 and the lower pressure head 22 are connected by bolts, forming a gap 27 between the frustum-shaped copper nozzles below them. The stepped bolt 23 is inserted through the countersunk groove 14 of the mounting plate body 11, then through the spring 24, and subsequently connected to the threaded hole of the upper pressure head 21.

[0034] The spring 24 provides different clamping forces as needed during the pressing process. The stepped bolt 23 and the countersunk groove 14 need to be clearance-fitted to ensure that they can move relative to each other in the vertical direction, allowing the spring to be compressed properly. A dust collection port 26 is provided on the side of the upper pressure head 21 for connecting to the dust collection branch pipe 31 of the dust collection pipeline system 3. A protective gas inlet is provided on the lower pressure head 22, connected to a miniature connector 25 for installing a protective gas pipeline. After entering from here, the protective gas passes through the gap 27 formed by the double-layer pressure head and enters the internal cavity 28, then is discharged from the dust collection port 26 along with the welding fumes.

[0035] Considering the dual-row pressure head structure, to prevent installation interference, the protective gas inlet and dust removal port 26 are located on the same side. To ensure that the protective gas is distributed as evenly as possible in the welding area and to prevent the protective gas from being discharged from the dust removal port 26 before covering the bottom of the cavity under strong dust removal suction, a gas blocking area 29 is set on the side near the miniature connector 25. Here, the upper and lower pressure head walls are in a close fit without gaps. After the protective gas is introduced, it will bypass the gas blocking area 29 and enter the internal cavity 28 from the other side, making the protective gas distribution more even.

[0036] In this embodiment, the pressure plate body 11 is provided with two rows of light-transmitting grooves 15 and two rows of countersunk grooves 14; the lower end of the corresponding mounting pressure plate 1 is connected to two rows of welding pressure heads 2; at the same time, the light-transmitting grooves 15 and the internal cavity 28 of the welding pressure head 2 are positioned opposite each other.

[0037] like Figure 5 As shown, the dust collection piping system 3 consists of dust collection branch pipes 31, a dust collection integrated pipe 32, and a main dust collection interface 33. One end of the dust collection branch pipe 31 is directly connected to the dust collection port 26 of the welding head 2 via a pipe thread, and the other end has a mounting plate with countersunk holes, which can be bolted to the side wall of the dust collection integrated pipe 32. The main dust collection interface 33 is located at the end of the dust collection integrated pipe 32 and is ultimately connected directly to the dust collector via a pipe.

[0038] like Figure 1 As shown, the lifting mechanism 4 is a screw-type displacement table, consisting of a screw module 41 and a mounting plate 42. The screw module 41 and the mounting plate 42, as well as the mounting plate 42 and the reinforcing rib 12, are all connected by bolts, which are used to control the vertical movement of the mounting plate. The lifting mechanism 4 can also adopt linear movement mechanisms such as pneumatic cylinders, hydraulic cylinders, or electric cylinders.

[0039] The working principle and process of the adjustable battery module laser welding fixture of this utility model are briefly described below.

[0040] First, connect the mounting plate 1 to the screw-type displacement table, and connect and install the upper pressure head 21 and lower pressure head 22 of the welding pressure head 2. Second, connect the welding pressure head 2 to the dust collection pipeline system 3 through the dust collection branch pipe 31. Third, place the spring 24 at the threaded hole above the welding pressure head 2, align it with the countersunk groove 14 of the mounting plate 1, and then insert the stepped bolt 23 from above the countersunk groove 14, passing through the spring 24 and connecting it to the threaded hole at the top of the upper pressure head 21. After tightening the stepped bolt, insert the limiting baffle 13 into the limiting groove near the stepped bolt 23 to complete the connection between the welding pressure head 2 and the mounting plate 1.

[0041] During operation, the vertical displacement of the entire fixture is controlled by a lead screw-type displacement table. The fixture is lowered until the bottom of the lower pressure head 22 contacts the workpiece, causing the spring 24 to deform significantly and generate sufficient clamping force, thus completing positioning and clamping. During welding, shielding gas enters the welding pressure head 2 through the miniature connector 25, while a dust collector absorbs the fumes generated during welding through the dust collection pipeline system 3. If the welding pressure head design needs to be changed, or the positioning spacing needs to be altered, there is no need to redesign the installation pressure plate; simply remove the limit baffle and step bolts, and repeat the above installation steps to complete the replacement.

[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An adjustable battery module laser welding fixture, characterized in that, include: The mounting plate (1) has a plate body (11), and the plate body (11) is provided with a light-transmitting groove (15) and a countersunk groove (14); Several welding pressure heads (2) are connected to the countersunk groove (14) via stepped bolts (23); the stepped bolts (23) and the countersunk groove (14) are clearance-fitted and can move along the countersunk groove (14) to adjust the horizontal position, used to clamp the workpiece and provide a protective gas passage; and Dust collection duct system (3) is used to collect welding fumes.

2. The adjustable battery module laser welding fixture according to claim 1, characterized in that, The mounting plate (1) includes a limiting baffle (13); the wall of the countersunk groove (14) is provided with a toothed limiting groove; the limiting baffle (13) can be inserted into the toothed limiting groove to limit the horizontal movement of the stepped bolt (23).

3. The adjustable battery module laser welding fixture according to claim 1, characterized in that, The welding head (2) is a double-layer structure formed by fitting together an upper head (21) and a lower head (22); the upper head (21) has an internal cavity (28) in the middle and a dust removal port (26) on the side; the lower head (22) has a protective gas inlet and is connected to a micro connector (25).

4. The adjustable battery module laser welding fixture according to claim 3, characterized in that, A gap (27) is formed at the bottom of the upper pressure head (21) and the lower pressure head (22) so that the protective gas inlet is connected to the internal cavity (28) of the upper pressure head (21).

5. The adjustable battery module laser welding fixture according to claim 4, characterized in that, The upper pressure head (21) and the lower pressure head (22) have a wall-fitting air-blocking area (29) on the side near the micro connector (25).

6. The adjustable battery module laser welding fixture according to claim 3, characterized in that, The stepped bolt (23) passes through the countersunk groove (14) and the spring (24) in sequence and is then connected to the upper pressure head (21); the spring (24) is used to provide clamping force.

7. The adjustable battery module laser welding fixture according to claim 3, characterized in that, The pressure plate body (11) is provided with two rows of light-transmitting grooves (15) and two rows of countersunk grooves (14); the lower end of the corresponding mounting pressure plate (1) is connected to two rows of welding pressure heads (2); the light-transmitting grooves (15) are opposite to the internal cavity (28) of the welding pressure head (2).

8. The adjustable battery module laser welding fixture according to claim 3, characterized in that, The dust removal pipeline system (3) includes a dust removal branch pipe (31), a dust removal integrated pipe (32), and a main dust removal interface (33); one end of the dust removal branch pipe (31) is connected to the dust removal port (26) of the welding head (2), and the other end is connected to the dust removal integrated pipe (32); the main dust removal interface (33) is located at the end of the dust removal integrated pipe (32).

9. The adjustable battery module laser welding fixture according to claim 1, characterized in that, One end of the mounting plate (1) is connected to a lifting mechanism (4), which is connected to the reinforcing rib (12) of the mounting plate (1) and is used to control the overall displacement of the tooling in the vertical direction.

10. The adjustable battery module laser welding fixture according to claim 9, characterized in that, The lifting mechanism (4) is a screw-type displacement table, including a screw module (41) and a mounting plate (42); the screw module (41) is connected to the mounting plate (42), and the mounting plate (42) is connected to the mounting pressure plate (1) through the reinforcing rib (12).

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