A welding structure for lithium battery pack production

Abstract

The utility model relates to the field of welding structure discloses a kind of welding structures for lithium battery pack production, including portal frame, the bottom outer wall of the portal frame is fixedly connected with support base plate, the top outer wall of the support base plate is provided with lifting structure, the outer wall of the lifting structure is provided with translation structure, in the utility model, by setting suction duct, cooling fan, heat dissipation fin forms high-efficiency heat dissipation system, after laser welding gun completes welding, cooling fan runs fast, air circulation around welding point is accelerated by suction duct, heat dissipation fin further expands heat dissipation area, realizes the rapid cooling of welding point, avoids that the fusion area of welding piece and electric core is not uniformly caused by high temperature shrinkage and leads to welding not firm, by setting I-shaped groove, laser welding gun can be accurately adapted, rotating clamp block and buckling installation buckle with fixed rod, welding gun can be quickly fixed, only need reverse operation when disassembling, without special tool, greatly simplify welding gun disassembly process, improve maintenance and replacement efficiency.

Description

Technical Field

[0001] This utility model relates to the field of welding structures, and in particular to a welding structure for lithium battery pack production. Background Technology

[0002] Welding structures for lithium battery pack production are core equipment in lithium battery pack manufacturing. They are used to weld cell tabs, terminals, and connecting pieces, directly affecting the conductivity, structural stability, and safety performance of lithium battery packs. They are suitable for high-frequency batch welding scenarios in production workshops and are key to ensuring production efficiency and product quality.

[0003] In the existing lithium battery pack welding production process, laser welding is usually carried out by the operator setting the welding parameters through the equipment control panel. Then, the cell component to be welded is precisely positioned in the welding station. After the equipment is started, the laser welding gun emits a laser beam that focuses and heats the welding area according to the preset path, so that the contact surface quickly fuses to form a stable weld point. After the welding is completed, the equipment automatically resets, and the operator can take out the workpiece for subsequent inspection or transfer.

[0004] Existing welding structures used in lithium battery pack production have significant defects, adversely affecting production efficiency and product quality. On the one hand, after adopting laser welding, the structure lacks an effective rapid cooling mechanism, making it impossible to cool the weld points in time. This results in the fusion area between the weld sheet and the cell remaining at a high temperature for an extended period, which not only easily leads to uneven shrinkage at the fusion point but also reduces the bonding strength, resulting in weak welds. In subsequent use, the weld points may loosen or fall off, seriously affecting the conductivity and safety stability of the lithium battery pack. On the other hand, the welding gun position is relatively fixed, and no convenient adjustment or disassembly structure is designed. When the welding gun needs to be repaired, maintained, or replaced, it must be disassembled using specialized wrenches and other tools. The process is cumbersome and time-consuming, which not only interrupts the normal production process, reducing production efficiency, but also increases the operational difficulty for maintenance personnel, hindering the rapid resumption of production. Therefore, a welding structure for lithium battery pack production is proposed to solve the above problems. Summary of the Invention

[0005] To overcome the above shortcomings, this utility model provides a welding structure for lithium battery pack production. It aims to improve the problems in the prior art where the weld joint cannot be cooled down quickly after laser welding, resulting in weak welding between the weld sheet and the cell, which affects the conductivity and safety stability of the lithium battery pack. It also addresses the issues of the fixed position of the welding gun, the need for a special wrench for disassembly and maintenance, the cumbersome and time-consuming steps, and the potential disruption of the production process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a welding structure for lithium battery pack production, comprising a gantry frame, a supporting base plate fixedly connected to the bottom outer wall of the gantry frame, a lifting structure provided on the top outer wall of the supporting base plate, a translation structure provided on the outer wall of the lifting structure, a welding gun base provided on the translation structure, an I-shaped groove provided on the outer wall of the welding gun base, a snap-fit ​​groove provided on the outer wall of the welding gun base, a laser welding gun provided on the inner wall of the I-shaped groove, a locking block rotatably connected to the outer wall of the welding gun base, a mounting buckle hinged to the outer wall of the welding gun base, a fixing rod fixedly connected to the outer wall of the mounting buckle, an exhaust pipe fixedly connected to the inner wall of the welding gun base, heat dissipation fins fixedly connected to the outer wall of the exhaust pipe, a fixing plate fixedly connected to the top outer wall of the exhaust pipe, a cooling fan fixedly connected to the outer wall of the fixing plate, and a lifting structure and a reciprocating mechanism provided on the supporting base plate.

[0007] As a further description of the above technical solution: The top outer wall of the support base plate is fixedly connected to a fixing buckle, the inner wall of the fixing buckle is provided with a support rod, the outer wall of the support rod is slidably connected to a reciprocating structure, the top of the reciprocating structure is fixedly connected to a solder pad base plate, the top outer wall of the solder pad base plate is fixedly connected to an ion heat sink, the top outer wall of the ion heat sink is fixedly connected to a welding worktable, the inner wall of the solder pad base plate is provided with a sliding groove, the inner wall of the sliding groove is fixedly connected to an electric actuator, and the output end of the electric actuator is fixedly connected to a fixing plate.

[0008] As a further description of the above technical solution: The lifting structure includes a second motor, the output end of which is fixedly connected to a threaded rod. A threaded sleeve is threadedly connected to the outer wall of the threaded rod, and a connecting plate is fixedly connected to the outer wall of the threaded sleeve. A support arm is fixedly connected to the top outer wall of the gantry frame, and the top outer wall of the threaded rod is rotatably connected to the inner wall of the support arm.

[0009] As a further description of the above technical solution: The translation structure includes a connecting plate, a first motor is fixedly connected to the outer wall of the connecting plate, the first motor is connected to a transmission belt via a pulley, a belt buckle is engaged on the outer wall of the transmission belt, a mounting plate is fixedly connected to the outer wall of the belt buckle, a sliding sleeve is fixedly connected to the outer wall of the mounting plate, and a sliding rod is provided on the inner wall of the sliding sleeve.

[0010] As a further description of the above technical solution: The reciprocating mechanism includes a third motor, which is also connected to a transmission belt via a pulley. The transmission belt is also engaged with a belt buckle on its outer wall, and the belt buckle is fixedly connected to the outer wall of the solder pad base plate.

[0011] As a further description of the above technical solution: The outer wall of the mounting buckle is also provided with an I-shaped groove, and the annular I-shaped groove formed by the mounting buckle and the welding gun base is adapted to the top outer wall of the laser welding gun.

[0012] As a further description of the above technical solution: The sliding sleeve is provided in several sets, and the several sets of sliding sleeves are respectively fixedly connected to the outer wall of the mounting plate, the outer wall of the connecting plate, and the bottom outer wall of the support plate.

[0013] As a further description of the above technical solution: The top outer wall of the fixing rod has a groove that matches the shape of the locking block.

[0014] As a further description of the above technical solution: The base plate of the solder pad is slidably connected to the outer wall of the support rod via a sliding sleeve.

[0015] As a further description of the above technical solution: One end of the slide rod is fixedly connected to the inner wall of the support arm, and the other end of the slide rod is fixedly connected to the outer wall of the support base plate.

[0016] This utility model has the following beneficial effects: 1. In this utility model, an efficient heat dissipation system is formed by setting up an exhaust pipe, a cooling fan, and heat dissipation fins. After the laser welding gun completes the welding, the cooling fan runs rapidly, and the exhaust pipe accelerates the air circulation around the weld point. The heat dissipation fins further expand the heat dissipation area, realizing rapid cooling of the weld point. This avoids the weld from being weak due to uneven shrinkage of the fusion area between the weld sheet and the battery cell caused by high temperature. The laser welding gun can be accurately adapted by setting an I-shaped groove. The welding gun can be quickly fixed by rotating the locking block and snapping on the mounting buckle with the fixing rod. Disassembly only requires reverse operation and no special tools are needed, which greatly simplifies the welding gun disassembly and assembly process and improves maintenance and replacement efficiency.

[0017] 2. In this utility model, by setting an electric push rod, the fixing plate can be moved laterally. The distance between the two fixing plates can be adjusted according to the width of different sizes of lithium battery packs, so as to achieve stable clamping of battery packs of various specifications and avoid the battery pack offset during welding, which would affect the accuracy. At the same time, by setting an ion heat sink, the battery cells can be cooled in an auxiliary manner during the welding process, and the heat generated by the high temperature of welding can be removed in time. This effectively reduces the safety hazards such as bulging and leakage of the cells due to high temperature, and ensures the safety and product quality stability of the lithium battery pack production process. Attached Figure Description

[0018] Figure 1 This is a front side view of the overall structure of a welding structure for lithium battery pack production proposed in this utility model; Figure 2 This is a side view of the back of the overall structure of a welding structure for lithium battery pack production proposed in this utility model. Figure 3 This is an exploded view of the mounting plate of a welding structure for lithium battery pack production proposed in this utility model. Figure 4 This is an exploded structural diagram of the welding pad chassis for a lithium battery pack manufacturing process proposed in this utility model. Figure 5 This is a bottom view of the overall structure of a welding structure for lithium battery pack production proposed in this utility model.

[0019] Legend: 1. Gantry frame; 2. Support base plate; 3. Connecting plate; 4. Fixing buckle; 5. Support rod; 6. Sliding sleeve; 7. Support arm; 8. Threaded rod; 9. Sliding rod; 10. First motor; 11. Transmission belt; 12. Exhaust duct; 13. Second motor; 14. Welding workbench; 15. Fixing plate; 16. Welding pad base plate; 17. Threaded sleeve; 18. Belt buckle; 19. Support plate; 20. Mounting plate; 21. Clip groove; 22. Mounting buckle; 23. I-shaped groove; 24. Heat dissipation fins; 25. Fixing plate; 26. Cooling fan; 27. Fixing rod; 28. Laser welding gun; 29. ​​Clamping block; 30. Electric push rod; 31. Ion radiator; 32. Sliding groove; 33. Welding gun base; 34. Third motor. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Reference Figures 1-2This utility model provides an embodiment of a welding structure for lithium battery pack production, including a gantry frame 1. The gantry frame 1 provides an installation base for the top support arm 7 and the bottom support plate 2. The support plate 2 is fixedly connected to the outer wall of the gantry frame 1. The support plate 2 is used to support the lifting structure, reciprocating structure, and fixing buckle 4, etc., and is the bottom support platform of the entire device. The lifting structure is provided on the outer wall of the gantry frame 1. The lifting structure is used to realize the vertical height adjustment of the translation structure and the laser welding gun 28, so as to adapt to the welding requirements of lithium battery packs of different thicknesses. The lifting structure includes a second motor 13, which provides a power source for the lifting action. The output end of the second motor 13 is fixedly connected to a threaded rod 8. The threaded rod 8 can rotate under the drive of the second motor 13, thereby driving the threaded sleeve 17 to move through the threaded transmission. The outer wall of the threaded rod 8 is threaded. The threaded connection is provided with a threaded sleeve 17, which is fixed to the connecting plate 3 and can drive the connecting plate 3 to move up and down synchronously. The outer wall of the threaded sleeve 17 is fixedly connected to the connecting plate 3. The connecting plate 3 is an intermediate component connecting the lifting structure and the translation structure. It can transmit the power of the lifting structure to the translation structure and provide an installation position for the first motor 10 and the sliding sleeve 6. The top outer wall of the gantry frame 1 is fixedly connected to a support arm 7. The support arm 7 is used to support the top of the threaded rod 8 and one end of the sliding rod 9 to ensure the stability of the lifting structure and the translation structure during operation. The top outer wall of the threaded rod 8 is rotatably connected to the inner wall of the support arm 7. The support base plate 2 is provided with a lifting structure and a reciprocating mechanism. The lifting structure is used to drive the translation structure and the laser welding gun 28 to move up and down, thereby adjusting the height of the laser welding gun 28 to adapt to the welding operation of lithium battery packs of different thicknesses.

[0022] Reference Figures 1-2The outer wall of the lifting structure is equipped with a translation structure, which is used to move the welding torch base 33 and the laser welding torch 28 horizontally to achieve precise docking of different welding positions of the lithium battery pack. The translation structure includes a connecting plate 3, which is the mounting carrier of the first motor 10 in the translation structure. The first motor 10 is fixedly connected to the outer wall of the connecting plate 3. The first motor 10 provides power for the translation movement and drives the transmission belt 11 through a pulley. The first motor 10 is connected to the transmission belt 11 through the pulley. The transmission belt 11 can transmit the power of the first motor 10 to the belt buckle 18, which drives the belt buckle 18 to move along the direction of the transmission belt 11. The outer wall of the transmission belt 11 is engaged with the belt buckle 18, which is used to connect the transmission belt 11 and the mounting plate 20, and can convert the power of the transmission belt 11 into the power of the mounting plate 20. The horizontal movement force is provided by the mounting plate 20, which is fixedly connected to the outer wall of the belt buckle 18. The mounting plate 20 is used to connect the belt buckle 18 and the welding gun base 33, and at the same time provides a mounting point for the sliding sleeve 6 to realize the synchronous movement of the translation structure and the welding gun base 33. The sliding sleeve 6 is fixedly connected to the outer wall of the mounting plate 20. The sliding sleeve 6 can slide along the sliding rod 9, which guides and stabilizes the horizontal movement of the mounting plate 20 and avoids deviation during the movement. The inner wall of the sliding sleeve 6 is provided with a sliding rod 9, which provides a sliding track for the sliding sleeve 6 to ensure that the translation structure moves smoothly in a fixed direction. One end of the sliding rod 9 is fixedly connected to the inner wall of the support arm 7, and the other end of the sliding rod 9 is fixedly connected to the outer wall of the support base plate 2. The two ends are fixed through the support arm 7 and the support base plate 2 to ensure the structural stability of the sliding rod 9. The translation structure is provided with a welding gun base 33.

[0023] Reference Figure 3The welding torch base 33 is the main mounting carrier for the laser welding torch 28, and also integrates heat dissipation components such as the exhaust pipe 12 and heat dissipation fins 24. The outer wall of the welding torch base 33 has an I-shaped groove 23, which mates with the I-shaped groove 23 of the mounting clip 22 to form an annular groove for fixing the laser welding torch 28. The outer wall of the welding torch base 33 also has a clip groove 21, which accommodates the fixing rod 27, facilitating its positioning when the mounting clip 22 is closed. The inner wall of the I-shaped groove 23 houses the laser welding torch 28, a core component for welding lithium battery packs. It is fixed by the engagement of the I-shaped groove 23 and the mounting clip 22. A locking block 29 is rotatably connected to the outer wall of the welding torch base 33, and can be rotatably engaged within the groove of the fixing rod 27, thus securing the mounting clip 22 to the welding torch base. The laser welding gun 28 is locked in place by a locking mechanism 33 to prevent it from loosening. A mounting buckle 22 is hinged to the outer wall of the welding gun base 33. The mounting buckle 22 can rotate around the hinge point and cooperates with the welding gun base 33 to form a closed structure, jointly fixing the laser welding gun 28. The outer wall of the mounting buckle 22 also has an I-shaped groove 23. The circular I-shaped groove 23 formed by the mounting buckle 22 and the welding gun base 33 matches the top outer wall of the laser welding gun 28. This annular groove design ensures the coaxiality and stability of the laser welding gun 28 after installation, preventing shaking during welding. A fixing rod 27 is fixedly connected to the outer wall of the mounting buckle 22. The fixing rod 27 cooperates with the locking block 29 to lock the mounting buckle 22. The groove on its top matches the shape of the locking block 29, ensuring tightness after locking. The top outer wall of the fixing rod 27 also has a groove.

[0024] Reference Figure 3 An exhaust pipe 12 is fixedly connected to the inner wall of the welding torch base 33. The exhaust pipe 12 is used to extract the heat generated during the welding process, and works with the cooling fan 26 to improve heat dissipation efficiency. A heat dissipation fin 24 is fixedly connected to the outer wall of the exhaust pipe 12. The heat dissipation fin 24 increases the contact area between the exhaust pipe 12 and the air, accelerating heat dissipation and helping to reduce the temperature of the laser welding torch 28 and the welding torch base 33. A mounting plate 25 is fixedly connected to the top outer wall of the exhaust pipe 12. The mounting plate 25 is used to fix the cooling fan 26, providing a stable mounting platform for the cooling fan 26. A cooling fan 26 is fixedly connected to the outer wall of the plate 25. The cooling fan 26 can accelerate airflow and quickly remove heat through the exhaust pipe 12 and heat dissipation fins 24 to achieve active heat dissipation of the welded structure. Several sets of sliding sleeves 6 are provided, and the sets of sliding sleeves 6 are fixedly connected to the outer wall of the mounting plate 20, the outer wall of the connecting plate 3 and the bottom outer wall of the support plate 19 respectively. The multiple sets of sliding sleeves 6 provide guidance for the translation of the mounting plate 20 and the lifting of the connecting plate 3, ensuring the stability of each component when moving. The support plate 19 can further enhance the support strength of the sliding rod 9. Reference Figures 4-5A fixing buckle 4 is fixedly connected to the top outer wall of the support base plate 2. The fixing buckle 4 is used to fix the bottom of the support rod 5 to prevent the support rod 5 from shifting or shaking during use. The inner wall of the fixing buckle 4 is provided with the support rod 5. The support rod 5 provides a track for the sliding of the solder pad base plate 16 and supports the solder pad base plate 16 and the welding worktable 14 above it. The outer wall of the support rod 5 is slidably connected with a reciprocating structure. The reciprocating structure is used to drive the solder pad base plate 16 and the welding worktable 14 to reciprocate along the support rod 5 to realize the continuous conveying or multi-station welding of the lithium battery pack. The reciprocating mechanism includes There is a third motor 34, which provides power to the reciprocating structure. It drives the transmission belt 11 to rotate through a pulley. The third motor 34 is also connected to the transmission belt 11 through a pulley. The transmission belt 11 can transmit the power of the third motor 34 to the belt buckle 18, which drives the belt buckle 18 and the solder pad base plate 16 to move. The outer wall of the transmission belt 11 also engages with the belt buckle 18. The belt buckle 18 is used to connect the transmission belt 11 and the solder pad base plate 16. It can convert the power of the transmission belt 11 into the reciprocating force of the solder pad base plate 16. The belt buckle 18 is fixedly connected to the outer wall of the solder pad base plate 16.

[0025] Reference Figures 4-5 The top of the reciprocating structure is fixedly connected to a solder pad base plate 16. The solder pad base plate 16 supports components such as the ion heat sink 31, the welding worktable 14, and the electric actuator 30. It also slides along the support rod 5 via a sliding sleeve 6. The solder pad base plate 16 is slidably connected to the outer wall of the support rod 5 via the sliding sleeve 6, allowing it to slide smoothly along the support rod 5 and ensuring the stability of the solder pad base plate 16 during reciprocating motion. An ion heat sink 31 is fixedly connected to the top outer wall of the solder pad base plate 16. The ion heat sink 31 uses airflow to remove the heat generated by the welding worktable 14 during welding, preventing heat transfer to the lithium battery pack and affecting its performance. It also neutralizes the ions generated during welding, improving welding quality. A welding workbench 14 is fixedly connected to the top outer wall of 1. The welding workbench 14 is a platform for placing lithium battery packs and provides a stable support surface for welding lithium battery packs. A sliding groove 32 is opened on the inner wall of the welding pad base plate 16. The sliding groove 32 provides space for the installation of electric push rod 30 and the sliding of fixing plate 15. The electric push rod 30 is fixedly connected to the inner wall of the sliding groove 32. The electric push rod 30 provides power for the movement of fixing plate 15. The position of fixing plate 15 can be adjusted according to the size of lithium battery pack. The output end of electric push rod 30 is fixedly connected to fixing plate 15. Fixing plate 15 can move along sliding groove 32 under the drive of electric push rod 30 to achieve clamping and fixing of lithium battery packs of different sizes and prevent the lithium battery pack from shifting during welding.

[0026] Working principle: When the laser welding torch 28 needs to be replaced, first turn off the power and stop the machine. Unscrew the locking block 29 to release the locking of the mounting buckle 22. Open the mounting buckle 22 and take out the welding torch to be replaced. Put the new welding torch into the I-shaped groove 23 and close the mounting buckle 22 to ensure that the fixing rod 27 is embedded in the buckle groove 21. Then tighten the locking block 29 to complete the replacement. When welding lithium battery packs, place the lithium battery pack on the welding worktable 14, start the electric push rod 30 to drive the fixing plate 15 to clamp the battery pack along the sliding groove 32, and confirm that the welding torch is fixed in place. Then adjust the welding position, start the second motor 13, and pass through the threaded rod 8 and threaded sleeve. 17. The connecting plate 3 and welding gun are raised and lowered to the appropriate height. Then, the first motor 10 is started. The welding gun is moved horizontally along the slide rod 9 via the transmission belt 11 and belt buckle 18. The slide sleeve 6 guides the movement until it is aligned with the welding point. Then, the welding operation begins. The third motor 34 is started, which moves the welding pad base plate 16 and battery pack back and forth along the support rod 5. At the same time, the laser welding gun 28 is started to perform continuous welding. The cooling fan 26, the exhaust pipe 12 and the heat dissipation fins 24 work together to dissipate heat. The ion heat sink 31 neutralizes ions and absorbs heat. After the welding is completed, all equipment is turned off. The electric push rod 30 is started in reverse to release the fixing plate 15.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A welding structure for lithium battery pack production, comprising a gantry (1), characterized in that: The bottom outer wall of the gantry frame (1) is fixedly connected to a support base plate (2). The top outer wall of the support base plate (2) is provided with a lifting structure. The outer wall of the lifting structure is provided with a translation structure. The translation structure is provided with a welding gun base (33). The outer wall of the welding gun base (33) is provided with an I-shaped groove (23). The outer wall of the welding gun base (33) is provided with a snap-fit ​​groove (21). The inner wall of the I-shaped groove (23) is provided with a laser welding gun (28). The outer wall of the welding gun base (33) is rotatably connected with a locking block (29). The outer wall of the welding torch base (33) is hinged with a mounting buckle (22), and the outer wall of the mounting buckle (22) is fixedly connected with a fixing rod (27). The inner wall of the welding torch base (33) is fixedly connected with an exhaust pipe (12), the outer wall of the exhaust pipe (12) is fixedly connected with a heat dissipation fin (24), the top outer wall of the exhaust pipe (12) is fixedly connected with a fixing plate (25), the outer wall of the fixing plate (25) is fixedly connected with a cooling fan (26), and the support base plate (2) is provided with a lifting structure and a reciprocating mechanism.

2. The welding structure for lithium battery pack production according to claim 1, characterized in that: The top outer wall of the support base plate (2) is fixedly connected to a fixing buckle (4), the inner wall of the fixing buckle (4) is provided with a support rod (5), the outer wall of the support rod (5) is slidably connected to a reciprocating structure, the top of the reciprocating structure is fixedly connected to a solder pad base plate (16), the top outer wall of the solder pad base plate (16) is fixedly connected to an ion heat sink (31), the top outer wall of the ion heat sink (31) is fixedly connected to a welding workbench (14), the inner wall of the solder pad base plate (16) is provided with a sliding groove (32), the inner wall of the sliding groove (32) is fixedly connected to an electric push rod (30), and the output end of the electric push rod (30) is fixedly connected to a fixing plate (15).

3. The welding structure for lithium battery pack production according to claim 1, characterized in that: The lifting structure includes a second motor (13), the output end of which is fixedly connected to a threaded rod (8), the outer wall of which is threadedly connected to a threaded sleeve (17), the outer wall of which is fixedly connected to a connecting plate (3), the top outer wall of the gantry (1) is fixedly connected to a support arm (7), and the top outer wall of the threaded rod (8) is rotatably connected to the inner wall of the support arm (7).

4. The welding structure for lithium battery pack production according to claim 1, characterized in that: The translation structure includes a connecting plate (3), a first motor (10) is fixedly connected to the outer wall of the connecting plate (3), the first motor (10) is connected to a transmission belt (11) via a pulley, a belt buckle (18) is engaged on the outer wall of the transmission belt (11), a mounting plate (20) is fixedly connected to the outer wall of the belt buckle (18), a sliding sleeve (6) is fixedly connected to the outer wall of the mounting plate (20), and a sliding rod (9) is provided on the inner wall of the sliding sleeve (6).

5. The welding structure for lithium battery pack production according to claim 1, characterized in that: The reciprocating mechanism includes a third motor (34), which is also connected to a transmission belt (11) via a pulley. The transmission belt (11) is also engaged with a belt buckle (18) on its outer wall. The belt buckle (18) is fixedly connected to the outer wall of the solder pad base plate (16).

6. The welding structure for lithium battery pack production according to claim 1, characterized in that: The outer wall of the mounting buckle (22) is also provided with an I-shaped groove (23). The circular I-shaped groove (23) formed by the mounting buckle (22) and the welding gun base (33) is adapted to the top outer wall of the laser welding gun (28).

7. The welding structure for lithium battery pack production according to claim 4, characterized in that: The sliding sleeve (6) is provided in several groups, and the several groups of sliding sleeves (6) are respectively fixedly connected to the outer wall of the mounting plate (20), the outer wall of the connecting plate (3) and the bottom outer wall of the support plate (19).

8. The welding structure for lithium battery pack production according to claim 2, characterized in that: The top outer wall of the fixing rod (27) is provided with a groove that matches the shape of the locking block (29).

9. A welding structure for lithium battery pack production according to claim 2, characterized in that: The solder pad base plate (16) is slidably connected to the outer wall of the support rod (5) via a sliding sleeve (6).

10. A welding structure for lithium battery pack production according to claim 4, characterized in that: One end of the slide rod (9) is fixedly connected to the inner wall of the support arm (7), and the other end of the slide rod (9) is fixedly connected to the outer wall of the support base plate (2).

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