Square battery shell laser welding positioning tool

Abstract

The application discloses a square battery shell laser welding positioning tool, and relates to the technical field of welding positioning. The square battery shell laser welding positioning tool comprises a positioning seat, the upper end of the positioning seat is provided with an XY-axis movement platform, the driving end of the XY-axis movement platform is provided with a laser welding gun, the upper end of the positioning seat is fixedly provided with a fixed frame, a sliding groove is formed in the middle of the positioning seat, and connecting ears are fixedly arranged at the four corners of the positioning seat. A driving motor is fixedly arranged on one side of the positioning seat, a connecting structure is arranged at the driving end of the driving motor, two positioning frames and two limiting frames are arranged on the connecting structure, the connecting structure can first reversely move the two positioning frames in the length direction of the positioning seat, and then reversely move the two limiting frames in the width direction of the positioning seat. The square battery shell laser welding positioning tool realizes self-adaptive center positioning of square battery shells of different specifications, does not need to be repeatedly debugged by workers, and effectively improves the overall operation efficiency of the positioning tool.

Description

Technical Field

[0001] This invention relates to the field of welding positioning technology, specifically to a laser welding positioning fixture for square battery casings. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage equipment, and other fields, power batteries, as core energy supply components, directly affect the user experience and operational reliability of end products. Among them, prismatic batteries, with their compact structure, high energy density, and high assembly efficiency, have become the mainstream form in the power battery market. In the manufacturing process of prismatic batteries, casing encapsulation is a core process to ensure battery sealing performance, prevent electrolyte leakage, and reduce the risk of internal short circuits. Compared to traditional welding processes, laser welding has advantages such as concentrated energy, small welding deformation, narrow heat-affected zone, dense and uniform weld seam, and strong automation adaptability, and is now widely used in battery encapsulation processes. The high-precision processing requirements of laser welding heavily rely on the precise positioning and stable fixing of the positioning fixtures.

[0003] In the laser welding process of square battery casings, while existing positioning fixtures can achieve basic workpiece clamping and alignment, ensuring the basic positioning requirements of welding operations, they still have significant limitations in actual production applications. Currently, mainstream positioning fixtures on the market generally employ a split-type, dual-drive, independent control structure with dual motors and dual cylinders for the horizontal positioning adjustment of the two mutually perpendicular sets of square battery casings. The two positioning mechanisms are not linked and require separate debugging and locking calibration. A small number of fixtures using a single-drive linkage design have poor structural adaptability, only suitable for single or a few battery casings with fixed length and width dimensions, making it difficult to flexibly adapt to multi-specification products. With the continuous enrichment of new energy battery categories, the length and width specifications of square battery casings are becoming increasingly diverse. Existing fixtures lack adaptive step-by-step positioning adjustment capabilities, making it difficult to quickly complete orderly progressive positioning correction in the horizontal and vertical directions according to different workpiece specifications. During production changeover and debugging, operators need to repeatedly manually calibrate the positioning stroke, adjust the limit structure, and lock the positioning components one by one. The overall adjustment process is cumbersome and complex, and production changeover is time-consuming, resulting in a significant lack of efficiency in the positioning fixture operation.

[0004] Therefore, it is necessary to invent a laser welding positioning fixture for square battery casings to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a laser welding positioning fixture for square battery casings to solve the problems mentioned in the background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: a laser welding positioning fixture for a square battery casing, including a positioning seat, an XY axis motion platform is provided on the upper end of the positioning seat, a laser welding gun is provided on the driving end of the XY axis motion platform, a fixing frame is fixed on the upper end of the positioning seat, a sliding groove is provided in the middle of the positioning seat, and connecting ears are fixed at the four corners of the positioning seat; A drive motor is fixed on one side of the positioning seat. The drive end of the drive motor is provided with a connecting structure. The connecting structure is provided with two positioning frames and two limiting frames. The connecting structure can first move the two positioning frames in the opposite direction along the length of the positioning seat, and then move the two limiting frames in the opposite direction along the width of the positioning seat, so as to adaptively center and position the square battery shell to be laser welded.

[0007] Preferably, the connecting structure includes a smooth rod, with threaded tubes rotatably connected to the inner walls of both sides of the smooth rod. Positioning frames are threadedly connected to the outer surfaces of the two threaded tubes. Two rollers are rotatably connected to the adjacent sides of the two positioning frames. Arc-shaped grooves are formed at the adjacent ends of the two threaded tubes. A driving bevel gear is rotatably connected to the inner wall of the middle section of the smooth rod. Several slots are formed in the middle of the driving bevel gear. A stabilizing groove is formed in the middle of the smooth rod. Two stabilizing blocks are slidably connected to the inner wall of the stabilizing groove. Springs are fixed to the adjacent ends of the two stabilizing blocks. A locking block is fixed to one end of each of the two stabilizing blocks. Arc-shaped protrusions are fixed to the distancing sides of the two stabilizing blocks. Two driven bevel gears are meshed with the driving bevel gear. Threaded rods are fixed to the middle of each of the two driven bevel gears. Limiting frames are threadedly connected to the outer surfaces of the two threaded rods. Several rubber pads are fixed to the adjacent sides of the two limiting frames.

[0008] Preferably, one end of the smooth rod is fixed to the drive end of the drive motor, the outer surface of the smooth rod is rotatably connected to the inner wall of the middle part of the positioning seat, the inner walls on both sides of the smooth rod are rotatably connected to the inner walls of two threaded tubes, the outer surfaces of the two threaded tubes are threadedly connected to the middle of two positioning frames, the threads of the two threaded tubes are facing opposite directions, the outer surfaces of the two positioning frames are slidably connected to the inner walls on both sides of the slide groove, and the two ends of each pair of adjacent rollers are rotatably connected to the two sides of one of the positioning frames.

[0009] Preferably, the inner wall of the active bevel gear is rotatably connected to the inner wall of the middle part of the smooth rod. Several slots are distributed in a ring and pass through the middle part of the active bevel gear. The stabilizing groove is opened in the middle part of the smooth rod. The outer surfaces of the two stabilizing blocks are slidably connected to the inner walls on both sides of the stabilizing groove. The two stabilizing blocks are distributed at a certain angle. The middle parts of the two stabilizing blocks are fixed to both ends of the spring. The spring is set in the stabilizing groove. One end of the two stabilizing blocks is fixed to one end of the two locking blocks. The outer surfaces of the two locking blocks are slidably connected to the inner walls on both sides of the stabilizing groove. The vertical cross-section of the two locking blocks is L-shaped. The outer surfaces of the two locking blocks are in contact with the inner walls of two of the slots. The near ends of the two arc-shaped protrusions are fixed to the opposite sides of the two stabilizing blocks. The arc-shaped surfaces of the opposite sides of the two arc-shaped protrusions are in contact with the inner walls of the two arc-shaped grooves. The two arc-shaped grooves are opened on one side of the near ends of the two threaded pipes.

[0010] Preferably, the driving bevel gear is meshed with two driven bevel gears on both sides, the middle of the two driven bevel gears is fixed to the near ends of two threaded rods, the outer surfaces of the two threaded rods are rotatably connected to the inner walls of the two sides of the positioning seat, the vertical section of each threaded rod is T-shaped, the threads of the two threaded rods are opposite, the middle of the two limiting frames is threaded to the outer surfaces of the two threaded rods, the outer surfaces of the two limiting frames are slidably connected to the inner walls of the other two sides of the slide groove, and the far ends of several rubber pads are fixed to the near sides of the two limiting frames.

[0011] Preferably, one end of the threaded rod is fixed with a support rod, the other end of the support rod is fixed with a drive gear, the drive gear is meshed with a driven gear, a connecting rod is fixed in the middle of the driven gear, a fan impeller is fixed at the other end of the connecting rod, a wind guide frame is rotatably connected to the outer surface of the connecting rod, and a wind guide groove is provided in the middle of the wind guide frame.

[0012] Preferably, one end of the support rod is fixed to one of the threaded rods at the end away from the driven bevel gear, and the other end of the support rod is fixed to the middle of the driving gear. The driving gear and the driven gear are meshed and connected, and the diameter of the driven gear is smaller than the diameter of the driving gear.

[0013] Preferably, the driven gear is fixed at one end of the connecting rod, the other end of the connecting rod is fixed at the middle of the fan impeller, the outer surface of the connecting rod is rotatably connected to the inner wall of one side of the air guide frame, the air guide groove passes through the middle of the air guide frame, the lower end of the air guide frame is fixed to the rear side of the positioning seat, the fan impeller is set in the air guide groove, and the vertical section of the air guide frame is V-shaped.

[0014] Preferably, one of the limiting frames is fixed to a support frame on one side, and a triangular plate is fixed to the other end of the support frame. A limiting groove is opened in the middle of the positioning seat, and a lifting frame is slidably connected to the inner wall of the limiting groove.

[0015] Preferably, the outer surface of the lifting frame is slidably connected to the inner wall of the limiting groove, the limiting groove passes through the middle of the upper end of the sliding groove, the vertical cross-section of the lifting frame is U-shaped, the outer surface of the lifting frame is in contact with the outer surface of the support frame, one end of the support frame is fixed to one side of one of the limiting frames, the cross-section of the support frame is L-shaped, the lower end of the triangular plate is fixed to the other end of the support frame, the vertical cross-section of the triangular plate is a right triangle, and the inclined surface of the triangular plate is in contact with the inclined surface of one end of the lifting frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention realizes adaptive centering positioning of square battery shells of different specifications, without the need for repeated adjustments by staff, and can automatically complete rapid centering calibration, effectively improving the overall operating efficiency of the positioning fixture. (2) The present invention achieves the effect of positioning and pre-welding dust removal at the same time, without the need to set up a separate dust removal station and additional drive components, which can simplify the pre-processing operation steps and effectively improve the process integration and operation continuity of the positioning fixture. (3) The present invention achieves the effect of automatic lifting, so that a certain gap is formed between the square battery shell and the positioning seat, which makes it convenient for subsequent workers to pick up the workpiece and optimizes the operability and on-site adaptability of the positioning fixture. Attached Figure Description

[0017] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a front cross-sectional view of the positioning seat of the present invention; Figure 3 This is a partial cross-sectional view of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of the structure of section A in the middle; Figure 5 This is a side sectional view of the positioning seat of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of the structure of section B in the middle; Figure 7 This is a schematic diagram of the lifting frame structure of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of the structure of section C; Figure 9 This is a partial structural diagram of the present invention.

[0018] In the diagram: 1. Positioning seat; 2. Fixing frame; 3. Slide groove; 4. Drive motor; 5. Smooth rod; 6. Threaded tube; 7. Positioning frame; 8. Roller; 9. Arc groove; 10. Driving bevel gear; 11. Slot; 12. Stabilizing groove; 13. Stabilizing block; 14. Spring; 15. Locking block; 16. Arc protrusion; 17. Driven bevel gear; 18. Threaded rod; 19. Limiting frame; 20. Rubber pad; 21. Support rod; 22. Driving gear; 23. Driven gear; 24. Connecting rod; 25. Fan impeller; 26. Air guide frame; 27. Air guide groove; 28. Support frame; 29. ​​Triangular plate; 30. Lifting frame; 31. Limiting groove; 32. Connecting ear; 33. XY axis motion platform; 34. Laser welding gun. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 This embodiment provides a positioning fixture for laser welding of a square battery casing; Please see Figures 1-9As shown, the system includes a positioning seat 1, an XY-axis motion platform 33 on the upper end of the positioning seat 1, a laser welding gun 34 on the drive end of the XY-axis motion platform 33, a fixing frame 2 fixed on the upper end of the positioning seat 1, a sliding groove 3 in the middle of the positioning seat 1, and connecting ears 32 fixed at each of the four corners of the positioning seat 1; a drive motor 4 fixed on one side of the positioning seat 1, and a connecting structure on the drive end of the drive motor 4, the connecting structure including a smooth rod 5, threaded tubes 6 rotatably connected to the inner walls of both sides of the smooth rod 5, positioning frames 7 threadedly connected to the outer surfaces of the two threaded tubes 6, two rollers 8 rotatably connected to the adjacent sides of the two positioning frames 7, arc-shaped grooves 9 in the adjacent ends of the two threaded tubes 6, a drive bevel gear 10 rotatably connected to the inner wall of the middle of the smooth rod 5, several slots 11 in the middle of the drive bevel gear 10, and a stabilizing groove 12 in the middle of the smooth rod 5. Two stabilizing blocks 13 are slidably connected to the inner wall of the stabilizing groove 12. A spring 14 is fixed to the near end of the two stabilizing blocks 13. A locking block 15 is fixed to one end of each of the two stabilizing blocks 13. An arc-shaped protrusion 16 is fixed to the opposite side of each of the two stabilizing blocks 13. The driving bevel gear 10 meshes with two driven bevel gears 17. A threaded rod 18 is fixed to the middle of each of the two driven bevel gears 17. A limit frame 19 is threadedly connected to the outer surface of each of the two threaded rods 18. Several rubber pads 20 are fixed to the near side of each of the two limit frames 19. The structural design of the roller 8 can reduce the sliding friction between the square battery shell and the positioning frame 7 during the process of pushing the workpiece to adjust its position by the two sets of limit frames 19, reduce the resistance to workpiece movement, and enable the workpiece to be adjusted smoothly and steadily, avoiding scratches and wear on the shell surface, and ensuring a smooth and orderly centering positioning process.

[0021] Please refer to it again. Figures 1-9As shown, one end of the smooth rod 5 is fixed to the drive end of the drive motor 4. The outer surface of the smooth rod 5 is rotatably connected to the inner wall of the middle part of the positioning seat 1. The inner walls on both sides of the smooth rod 5 are rotatably connected to the inner walls of two threaded tubes 6. The outer surfaces of the two threaded tubes 6 are threadedly connected to the middle of two positioning frames 7. The threads of the two threaded tubes 6 face opposite directions. The outer surfaces of the two positioning frames 7 are slidably connected to the inner walls on both sides of the slide groove 3. The two ends of each pair of adjacent rollers 8 are rotatably connected to the two sides of one of the positioning frames 7. The inner wall of the drive bevel gear 10 is rotatably connected to the inner wall of the middle part of the smooth rod 5. Several slots 11 are distributed in a ring and pass through the middle of the drive bevel gear 10. The stabilizing groove 12 is opened in the middle of the smooth rod 5. The outer surfaces of two stabilizing blocks 13 are slidably connected to the inner walls on both sides of the stabilizing groove 12. The two stabilizing blocks 13 are distributed at a certain angle. The middle of the two stabilizing blocks 13 is fixed to both ends of the spring 14. The spring 14 is set in the stabilizing groove 12. One end of the two stabilizing blocks 13 is fixed to one end of two locking blocks 15. The outer surface is slidably connected to the inner walls of both sides of the stabilizing groove 12. The vertical sections of the two locking blocks 15 are L-shaped. The outer surfaces of the two locking blocks 15 contact the inner walls of two of the locking grooves 11. The proximal ends of the two arc-shaped protrusions 16 are fixed to the opposing sides of the two stabilizing blocks 13. The arc-shaped surfaces of the opposing sides of the two arc-shaped protrusions 16 contact the inner walls of the two arc-shaped grooves 9. The two arc-shaped grooves 9 are located on one side of the proximal ends of the two threaded pipes 6. The two sides of the driving bevel gear 10 mesh with the two driven bevel gears 17. A driven bevel gear 17 is fixed at the middle of two threaded rods 18 near their ends. The outer surfaces of the two threaded rods 18 are rotatably connected to the inner walls of the two sides of the positioning seat 1. The vertical section of each threaded rod 18 is T-shaped. The threads of the two threaded rods 18 face opposite directions. The middle of the two limit brackets 19 is threadedly connected to the outer surfaces of the two threaded rods 18. The outer surfaces of the two limit brackets 19 are slidably connected to the inner walls of the other two sides of the slide groove 3. Several rubber pads 20 are fixed at their opposite ends near the two limit brackets 19.

[0022] The specific implementation process is as follows: First, the positioning seat 1 is installed on the processing platform with bolts through the reserved holes of the connecting ears 32 fixed at the four corners. Then, the square battery shell is placed on the positioning seat 1. Subsequently, the smooth rod 5 is driven by the drive motor 4 to rotate. The smooth rod 5 maintains stable rotation under the limiting action of the inner wall of the positioning seat 1. In the initial state, the two positioning frames 7 and the two limiting frames 19 are in contact with the fixed frame 2 and are at the maximum opening distance. The two threaded tubes 6 that are rotated on the outside of the smooth rod 5 have arc-shaped grooves 9 at opposite ends. The arc-shaped grooves 9 and the arc-shaped protrusions 16 fit and engage with each other. When the smooth rod 5 rotates, it can drive the two threaded tubes 6 to rotate synchronously through the arc-shaped protrusions 16. Because the threads of the two threaded tubes 6 are opposite, the two positioning frames 7 that are threaded to the outer surface of the threaded tubes 6 slide in opposite directions under the limiting guidance of the inner walls on both sides of the slide groove 3; the two positioning frames 7 that are close to each other drive the four rollers 8 that are rotatably connected to the corresponding side to move closer together. The two sets of symmetrically arranged rollers 8, of which the two rollers 8 that first contact the square battery shell push the square battery shell to move and adjust until the workpiece is in the transverse center position. When the four rollers 8 are fully pressed against the workpiece and the two positioning frames 7 are restricted from moving further, the continuously rotating smooth rod 5 causes the arc-shaped protrusion 16 to be squeezed by the arc-shaped groove 9, bringing them closer together and sliding out of the arc-shaped groove 9. The arc-shaped protrusion 16 drives the end-fixed stabilizing block 13 to slide along the inner wall of the stabilizing groove 12 opened in the middle of the smooth rod 5, and the close-to-each-other stabilizing blocks 13 squeeze and compress the high-strength spring 14. At the same time, the two locking blocks 15, which are fixed to the ends of the stabilizing blocks 13 and distributed at an angle, slide into the slot 11 adjacent to the middle of the driving bevel gear 10. The slot 11 has an arc-shaped guide structure at its port to facilitate automatic alignment when the locking blocks 15 are inserted. The rotating smooth rod 5 drives the driving bevel gear 10 to rotate synchronously through the meshing of the locking blocks 15 and the slot 11. During the continuous rotation of the smooth rod 5, one of the arc-shaped protrusions 16 will briefly re-insert into the arc-shaped groove 9 under the elastic force of the compressed spring 14; at this time, the threaded tube 6 cannot rotate due to the locking limit between the positioning frame 7 and the workpiece, and the arc-shaped groove 9 will squeeze the arc-shaped protrusion 16 again to quickly disengage. During the brief insertion of a single arc-shaped protrusion 16, another set of locking blocks 15 still maintains engagement with the locking groove 11, thus alternating and cycling to ensure that the operation of the drive bevel gear 10 is uninterrupted; The rotating driving bevel gear 10 drives two meshing driven bevel gears 17 to rotate synchronously. The two driven bevel gears 17 drive two threaded rods 18, which are fixed in the middle and have opposite thread directions, to rotate together. The rotating threaded rods 18 drive two limiting brackets 19 connected by threads on their outer surfaces to move closer to each other under the limiting action of the inner wall of the slide groove 3. The two limiting brackets 19 contact the other two sides of the square battery casing through rubber pads 20 fixed to their surfaces, and are gradually pushed and finely adjusted until both sets of limiting brackets 19 are in contact with the workpiece surface, completing the longitudinal limiting of the square battery casing. This structure can achieve adaptive centering positioning of square battery casings of different specifications, without the need for repeated adjustments by operators. It can automatically complete rapid centering calibration, effectively improving the overall operating efficiency of the positioning fixture.

[0023] Example 2 Before laser welding the square battery casing, two independent processes—pre-welding dust removal and workpiece positioning—are typically required. Conventional positioning fixtures only have a single positioning function and cannot simultaneously perform dust removal as an auxiliary operation. The multiple processes are carried out separately, resulting in loose workflow connections and insufficient operational continuity. Therefore, optimizing the structure to incorporate pre-welding dust removal during the step-by-step workpiece positioning process can streamline the workflow, shorten the pre-processing cycle, and improve the integration and continuity of the positioning fixture's processes.

[0024] Please see Figures 1-9 As shown, based on Embodiment 1, the function of positioning and pre-welding dust removal is added; Please refer to it again. Figures 1-9 As shown, one end of one threaded rod 18 is fixed to a support rod 21, and the other end of the support rod 21 is fixed to a drive gear 22. The drive gear 22 is meshed with a driven gear 23. A connecting rod 24 is fixed in the middle of the driven gear 23, and a fan impeller 25 is fixed at the other end of the connecting rod 24. A guide frame 26 is rotatably connected to the outer surface of the connecting rod 24. A guide groove 27 is opened in the middle of the guide frame 26. One end of the support rod 21 is fixed to the end of one of the threaded rods 18 away from the driven bevel gear 17, and the other end of the support rod 21 is fixed to the drive gear 23. In the middle of the driven gear 22, the driving gear 22 and the driven gear 23 mesh with each other. The diameter of the driven gear 23 is smaller than that of the driving gear 22. The middle of the driven gear 23 is fixed to one end of the connecting rod 24, and the other end of the connecting rod 24 is fixed to the middle of the fan impeller 25. The outer surface of the connecting rod 24 is rotatably connected to the inner wall of one side of the air guide frame 26. The air guide groove 27 passes through the middle of the air guide frame 26. The lower end of the air guide frame 26 is fixed to the rear side of the positioning seat 1. The fan impeller 25 is set in the air guide groove 27. The vertical section of the air guide frame 26 is V-shaped.

[0025] The specific implementation process is as follows: The smooth rod 5 is driven by the drive motor 4 to rotate. The smooth rod 5, with the help of the locking block 15 and the active bevel gear 10, drives the two driven bevel gears 17 to rotate synchronously. The two driven bevel gears 17 drive the two threaded rods 18 fixed in the middle to rotate synchronously. When one of the threaded rods 18 rotates, it drives the support rod 21 fixed at the end to rotate together. The rotating support rod 21 drives the active gear 22 fixed at the other end to rotate synchronously. The rotating active gear 22 drives the meshing driven gears 23 to rotate. Because the overall diameter of the driven gear 23 is smaller than the diameter of the active gear 22, the driven gear 23 forms a speed-increasing transmission. While the active gear 22 rotates smoothly, the driven gear 23 maintains high-speed rotation. The high-speed rotating driven gear 23 drives the connecting rod 24 fixed in the middle to rotate synchronously at high speed. The connecting rod 24 further drives the fan impeller 25 fixed at the end to rotate at high speed. The high-speed rotating fan impeller 25, in conjunction with the air guide frame 26 fixed to the rear of the positioning seat 1, forms a directional airflow using the air guide grooves 27 inside the air guide frame 26. During the process of the threaded rod 18 driving the two limiting frames 19 to approach each other and complete the longitudinal limiting, the airflow generated by the fan impeller 25 is directionally blown onto the upper surface of the square battery casing through the air guide grooves 27. This allows for the automatic cleaning of pre-welding dust while the workpiece is being positioned step-by-step. This achieves the effect of pre-welding dust removal simultaneously with positioning, eliminating the need for a separate dust removal station and additional drive components. It simplifies pre-processing steps and effectively improves the process integration and operational continuity of the positioning fixture.

[0026] Example 3 After the square battery casing is welded, its weight is significant, and the workpiece fits tightly against the positioning platform, lacking suitable points for applying force, making it inconvenient to pick up and place the workpiece. Therefore, by adding an ejector structure, the battery casing can be moderately lifted after welding, reserving space for picking up and placing, reducing the difficulty of picking up the workpiece, and optimizing the operability and on-site adaptability of the positioning fixture.

[0027] Please see Figures 1-9 As shown, an automatic lifting function has been added based on Embodiment 1; Please refer to it again. Figures 1-9As shown, a support frame 28 is fixed to one side of one of the limiting frames 19, and a triangular plate 29 is fixed to the other end of the support frame 28. A limiting groove 31 is opened in the middle of the positioning seat 1. A lifting frame 30 is slidably connected to the inner wall of the limiting groove 31. The outer surface of the lifting frame 30 is slidably connected to the inner wall of the limiting groove 31. The limiting groove 31 passes through the middle of the upper end of the sliding groove 3. The vertical section of the lifting frame 30 is U-shaped. The outer surface of the lifting frame 30 is in contact with the outer surface of the support frame 28. One end of the support frame 28 is fixed to one side of one of the limiting frames 19. The cross section of the support frame 28 is L-shaped. The lower end of the triangular plate 29 is fixed to the other end of the support frame 28. The vertical section of the triangular plate 29 is a right triangle. The inclined surface of the triangular plate 29 is in contact with the inclined surface of one end of the lifting frame 30.

[0028] The specific implementation process is as follows: The smooth rod 5 is driven by the drive motor 4 to rotate. The smooth rod 5, through the locking block 15 and the active bevel gear 10, drives the two driven bevel gears 17 to rotate synchronously. The rotating driven bevel gears 17 drive the two threaded rods 18 fixed in the middle to rotate. The rotating threaded rods 18 drive the two limit frames 19 connected by threads on their outer surfaces to move closer to each other. At this time, the support frame 28 fixed to one side of one of the limit frames 19 moves synchronously with the limit frame 19. The moving support frame 28 supports the lifting frame 30 which is slidably connected to the inner wall of the limit groove 31 opened in the middle of the positioning seat 1, ensuring that the lifting frame 30 is always in the limit groove 31 and maintains a stable state. After the workpiece is positioned, the drive motor 4 stops working, and then the XY axis motion platform 33 controls the laser welding gun 34 to perform welding operations until the welding is completed. Then the drive motor 4 starts again and drives the smooth rod 5 to rotate in the opposite direction. At this point, the two threaded rods 18 rotate in opposite directions, causing the two limiting brackets 19 to loosen first. Subsequently, the previously compressed and close-to-each arc-shaped protrusions 16, under the reset action of the high-strength spring 14, re-insert into the arc-shaped grooves 9 at the ends of the two threaded tubes 6, and cause the two threaded tubes 6 to rotate synchronously in opposite directions. At this point, the two limiting brackets 19 are only in a loose state, no longer moving and remaining in this state; while the two counter-rotating threaded tubes 6 cause the two positioning brackets 7 connected by threads on their outer surfaces to move away from each other until the two positioning brackets 7 move to contact the fixed frame 2, at which point the positioning brackets 7 stop moving. After the positioning brackets 7 stop moving, the arc-shaped grooves 9 compress the arc-shaped protrusions 16 again, causing the arc-shaped protrusions 16 to disengage from the arc-shaped grooves 9, causing the locking block 15 to re-insert into the locking groove 11 opened in the drive bevel gear 10, thereby causing the drive bevel gear 10 to rotate in opposite directions. The driving bevel gear 10 drives two threaded rods 18 to rotate synchronously in opposite directions through two meshing driven bevel gears 17. The two threaded rods 18 rotating in opposite directions drive two limit frames 19 connected by threads on their outer surfaces to continue to move away from each other. At this time, the support frame 28, which is fixed to one of the limiting frames 19, moves synchronously with the limiting frame 19, causing the triangular plate 29, which is fixed to the other end of the support frame 28, to move synchronously. When the inclined surface of the moving triangular plate 29 comes into contact with the inclined surface of one end of the lifting frame 30, which is slidably connected in the limiting groove 31, the inclined surface of the triangular plate 29 exerts a squeezing force on the inclined surface of one end of the lifting frame 30, so that the lifting frame 30 moves stably upward under the limiting constraint of the inner wall of the limiting groove 31, and lifts the bottom of the welded square battery casing. The lifting frame 30 continues to move upward, lifting the square battery casing to achieve an automatic lifting effect. This creates a certain gap between the square battery casing and the positioning seat 1, making it easier for subsequent workers to pick up the workpiece. This optimizes the operability and on-site adaptability of the positioning fixture. At the same time, the two limit frames 19 also move to contact the fixed frame 2 and stop moving. Then, the drive motor 4 stops working, and the two arc-shaped protrusions 16 re-insert into the arc-shaped grooves 9 of the two threaded pipes 6. The entire fixture structure completes its action reset and waits for the next operation.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laser welding positioning fixture for a square battery casing, comprising a positioning base (1), wherein an XY-axis motion platform (33) is provided on the upper end of the positioning base (1), and a laser welding gun (34) is provided on the driving end of the XY-axis motion platform (33), characterized in that: The upper end of the positioning seat (1) is fixed with a fixing frame (2), the middle part of the positioning seat (1) is provided with a sliding groove (3), and the four corners of the positioning seat (1) are fixed with connecting ears (32). A drive motor (4) is fixed on one side of the positioning seat (1). The drive end of the drive motor (4) is provided with a connection structure. Two positioning frames (7) and two limiting frames (19) are provided on the connection structure. The connection structure can first move the two positioning frames (7) in the reverse direction of the length of the positioning seat (1), and then move the two limiting frames (19) in the reverse direction of the width of the positioning seat (1) to adaptively center the square battery shell to be laser welded.

2. The laser welding positioning fixture for a square battery casing according to claim 1, characterized in that: The connecting structure includes a smooth rod (5), with threaded tubes (6) rotatably connected to the inner walls of both sides of the smooth rod (5). Positioning frames (7) are threaded onto the outer surfaces of both threaded tubes (6). Two rollers (8) are rotatably connected to the adjacent sides of the two positioning frames (7). Arc-shaped grooves (9) are opened at the adjacent ends of the two threaded tubes (6). A drive bevel gear (10) is rotatably connected to the inner wall of the middle part of the smooth rod (5). Several slots (11) are opened in the middle of the drive bevel gear (10). A stabilizing groove (12) is opened in the middle of the smooth rod (5). The inner wall of the stabilizing groove (12) is... The sliding connection has two stabilizing blocks (13), and springs (14) are fixed at the near ends of the two stabilizing blocks (13). Each of the two stabilizing blocks (13) has a locking block (15) fixed at one end, and arc-shaped protrusions (16) are fixed at the opposite sides of the two stabilizing blocks (13). The driving bevel gear (10) meshes with two driven bevel gears (17), and threaded rods (18) are fixed in the middle of each of the two driven bevel gears (17). Limiting frames (19) are threadedly connected to the outer surfaces of the two threaded rods (18), and several rubber pads (20) are fixed at the near sides of the two limiting frames (19).

3. The laser welding positioning fixture for a square battery casing according to claim 2, characterized in that: One end of the smooth rod (5) is fixed to the drive end of the drive motor (4). The outer surface of the smooth rod (5) is rotatably connected to the inner wall of the middle part of the positioning seat (1). The inner walls on both sides of the smooth rod (5) are rotatably connected to the inner walls of two threaded tubes (6). The outer surfaces of the two threaded tubes (6) are threadedly connected to the middle part of two positioning frames (7). The threads of the two threaded tubes (6) are facing opposite directions. The outer surfaces of the two positioning frames (7) are slidably connected to the inner walls on both sides of the slide groove (3). The two ends of each pair of adjacent rollers (8) are rotatably connected to the two sides of one of the positioning frames (7).

4. The laser welding positioning fixture for a square battery casing according to claim 2, characterized in that: The inner wall of the active bevel gear (10) is rotatably connected to the inner wall of the middle part of the smooth rod (5). Several slots (11) are arranged in a ring and pass through the middle part of the active bevel gear (10). The stabilizing groove (12) is opened in the middle part of the smooth rod (5). The outer surfaces of the two stabilizing blocks (13) are slidably connected to the inner walls on both sides of the stabilizing groove (12). The two stabilizing blocks (13) are arranged at a certain angle. The middle part of the two stabilizing blocks (13) is fixed to both ends of the spring (14). The spring (14) is set in the stabilizing groove (12). The two stabilizing blocks (13) are fixed to the middle part of the spring (14). One end is fixed to one end of two card blocks (15). The outer surfaces of the two card blocks (15) are slidably connected to the inner walls of both sides of the stabilizing groove (12). The vertical cut surfaces of the two card blocks (15) are L-shaped. The outer surfaces of the two card blocks (15) are in contact with the inner walls of two of the card slots (11). The near ends of the two arc-shaped protrusions (16) are fixed to the opposite sides of the two stabilizing blocks (13). The arc-shaped surfaces of the opposite sides of the two arc-shaped protrusions (16) are in contact with the inner walls of the two arc-shaped grooves (9). The two arc-shaped grooves (9) are opened on one side of the near ends of the two threaded pipes (6).

5. The laser welding positioning fixture for a square battery casing according to claim 2, characterized in that: The active bevel gear (10) is meshed with two driven bevel gears (17) on both sides. The middle of the two driven bevel gears (17) is fixed to the near ends of two threaded rods (18). The outer surfaces of the two threaded rods (18) are rotatably connected to the inner walls of both sides of the positioning seat (1). The vertical section of each threaded rod (18) is T-shaped. The threads of the two threaded rods (18) are opposite. The middle of the two limiting frames (19) is threaded to the outer surfaces of the two threaded rods (18). The outer surfaces of the two limiting frames (19) are slidably connected to the inner walls of the other two sides of the slide groove (3). Several rubber pads (20) are fixed at their far ends to the near sides of the two limiting frames (19).

6. The laser welding positioning fixture for a square battery casing according to claim 2, characterized in that: One of the threaded rods (18) has a support rod (21) fixed at one end, and a drive gear (22) fixed at the other end of the support rod (21). The drive gear (22) is meshed with a driven gear (23). A connecting rod (24) is fixed in the middle of the driven gear (23). A fan impeller (25) is fixed at the other end of the connecting rod (24). A wind guide frame (26) is rotatably connected to the outer surface of the connecting rod (24). A wind guide groove (27) is opened in the middle of the wind guide frame (26).

7. The laser welding positioning fixture for a square battery casing according to claim 6, characterized in that: One end of the support rod (21) is fixed to one of the threaded rods (18) away from the driven bevel gear (17), and the other end of the support rod (21) is fixed to the middle of the driving gear (22). The driving gear (22) meshes with the driven gear (23), and the diameter of the driven gear (23) is smaller than the diameter of the driving gear (22).

8. The laser welding positioning fixture for a square battery casing according to claim 6, characterized in that: The driven gear (23) is fixed at one end of the connecting rod (24), and the other end of the connecting rod (24) is fixed at the middle of the fan impeller (25). The outer surface of the connecting rod (24) is rotatably connected to the inner wall of one side of the air guide frame (26). The air guide groove (27) passes through the middle of the air guide frame (26). The lower end of the air guide frame (26) is fixed to the rear side of the positioning seat (1). The fan impeller (25) is set in the air guide groove (27). The vertical section of the air guide frame (26) is set in a V shape.

9. The laser welding positioning fixture for a square battery casing according to claim 2, characterized in that: One of the limiting frames (19) has a support frame (28) fixed on one side, and a triangular plate (29) fixed on the other end of the support frame (28). A limiting groove (31) is opened in the middle of the positioning seat (1), and a lifting frame (30) is slidably connected to the inner wall of the limiting groove (31).

10. The laser welding positioning fixture for a square battery casing according to claim 9, characterized in that: The outer surface of the lifting frame (30) is slidably connected to the inner wall of the limiting groove (31). The limiting groove (31) passes through the middle of the upper end of the sliding groove (3). The vertical section of the lifting frame (30) is U-shaped. The outer surface of the lifting frame (30) is in contact with the outer surface of the support frame (28). One end of the support frame (28) is fixed to one side of one of the limiting frames (19). The cross section of the support frame (28) is L-shaped. The lower end of the triangular plate (29) is fixed to the other end of the support frame (28). The vertical section of the triangular plate (29) is a right triangle. The inclined surface of the triangular plate (29) is in contact with the inclined surface of one end of the lifting frame (30).

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