An automatic centering welding fixture mechanism for battery cell

Abstract

The application relates to the technical field of battery production and manufacturing, and discloses an automatic centering welding clamp mechanism for battery cells, which comprises a large plate, the upper surfaces of the large plate are respectively provided with a current collector pressing mechanism and a laser machine welding mechanism, the outer side of the current collector pressing mechanism is provided with a welding clamp mechanism body, the welding clamp mechanism body comprises a main plate, the inside of the main plate is provided with a clamp fixing plate, the upper surface of the clamp fixing plate is provided with a bearing fixing plate, the inside of the bearing fixing plate is provided with a linear bearing No.2, and the inner side of the linear bearing No.2 is slidably connected with a push rod. Through the welding clamp mechanism body, the workpiece can be automatically centered, different diameter battery cells can be accurately positioned, the clamp adopts a vertical design, through cooperation of a V-shaped wheel and a cover plate, the positioning center of different battery cells can be ensured to be concentric with the positioning center of the current collector, so that the battery cell and the current collector can always keep a coaxial state.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing equipment technology, specifically to an automatic cell centering welding fixture mechanism. Background Technology

[0002] In the lithium battery manufacturing process, the welding quality between the battery cell and the current collector, or connecting pieces, and other conductive components, directly affects the battery's conductivity, structural strength, and safety. Currently, in the welding process of cylindrical battery cells and current collectors, it is usually necessary to first position and clamp the battery cell and current collector, and then fix them together using methods such as laser welding.

[0003] In existing equipment, most use horizontal clamps to hold and position the battery cells. Since the current collector and the battery cell are in a separate state before welding, and there is no fixed connection between them, the current collector cannot maintain its relative position with the battery cell independently. The current collector loading, positioning and clamping and welding operations must be completed in the same station.

[0004] The inventors of this application discovered in their research that the core defect of the aforementioned prior art is that: due to the deviation in the diameter of each battery cell, the current collector is smaller than the diameter of the battery cell. When a horizontal clamp is used, due to the Earth's gravity, both the battery cell and the current collector are offset downwards. The lowest point of the current collector and the battery cell comes into contact with the clamp, causing the current collector and the battery cell to be misaligned during welding. The welding position of the current collector is offset, and after being inserted into the casing, the positive current collector comes into contact with the steel casing, causing a short circuit. Summary of the Invention

[0005] This invention provides an automatic cell centering welding fixture mechanism, which solves the problem of misalignment between the current collector and the cell during welding, and achieves the effect of concentricity between the cell positioning center and the current collector positioning center.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automatic cell centering welding fixture mechanism, comprising a large plate, on the upper surface of which a pressure collector mechanism and a laser welding mechanism are respectively mounted. A welding fixture mechanism body is disposed on the outer side of the pressure collector mechanism. The welding fixture mechanism body includes a main board, inside which a fixture fixing plate is mounted. A bearing fixing plate is mounted on the upper surface of the fixture fixing plate. A second linear bearing is mounted inside the bearing fixing plate. A push rod is slidably connected to the inner side of the second linear bearing. A plug screw is disposed inside the push rod and connected to a first connecting rod and a second connecting rod. A first clamp and a second clamp are respectively mounted inside the first and second connecting rods. A first linear bearing is mounted inside the first clamp. A first support column is mounted on the inner wall of the first linear bearing. A V-shaped wheel is mounted on the outer wall of the first support column. The cell body is disposed on the outer wall of the V-shaped wheel.

[0007] By adopting the above technical solution, the large plate serves as a unified installation benchmark, integrating the pressure collector plate, laser welding, and fixture body. The structure is compact, and the dual-station design enables alternating operations, improving overall production efficiency. The station conversion base plate, together with the fixture fixing plate and main plate, ensures the positional accuracy of components at each station and supports stable operation of station switching. The linear bearing double-constraint push rod performs linear reciprocating motion, with smooth and unhindered movement. The push rod, plug screw, and two sets of connecting rods form a hinged transmission structure, which can convert the linear motion of the push rod into the opening and closing motion of the gripper. The transmission logic is simple and reliable.

[0008] Preferably, the main board has a workstation 1 and a workstation 2 on both sides, a workstation conversion base plate is installed on the lower surface of the clamp fixing plate, a support plate 1 is installed on the lower surface of the battery cell body, a sliding guide assembly is installed on the outer wall of the support plate 1, the outer wall of the sliding guide assembly is set on the outer wall of the main board, a support column 3 is installed inside the support plate 1, one end of a tension spring is installed inside the support column 3, the other end of the tension spring is installed on the support column 2, the outer wall of the support column 2 is set inside the main board, a slider is installed inside the gripper 1, a slide rail is slidably connected to the inner wall of the slider, and a current collector 1 and a current collector 2 are respectively provided on the upper surface of the battery cell body on both sides, and a cover plate is provided on the outer wall of both the current collector 1 and the current collector 2.

[0009] Preferably, the outer wall of the cover plate is installed on the outer wall of the main board, the outer wall of the slide rail is installed on the outer wall of the main board, the first current collector and the second current collector correspond to the main body of the battery cell, and a reinforcing rib is installed between the bearing fixing plate, the clamp fixing plate and the main board.

[0010] Preferably, a washer two is installed on the outer wall of the linear bearing two, one end of a helical spring is installed on the outer wall of the washer two, and a washer one is installed on the other end of the helical spring. The interior of the washer one is installed on the outer wall of the push rod.

[0011] Preferably, the pressure collecting plate mechanism includes a vertical plate, the lower surface of which is mounted on the upper surface of a large plate, a base plate I is provided inside the vertical plate and the large plate, a support plate II is mounted on the upper surface of the vertical plate, and a reinforcing rib II is provided between the support plate II and the vertical plate.

[0012] Preferably, a cylinder is mounted on the upper surface of the second support plate, and a pusher is provided at the output end of the cylinder, which is located on the lower side of the second support plate.

[0013] Preferably, a second cylinder is installed on the outer wall of the upright plate, and a cylinder connecting plate is provided at the output end of the second cylinder. A pressure head is provided on the lower surface of the cylinder connecting plate, and the pressure head is located on the upper side of the cover plate.

[0014] Preferably, a welding base plate is installed on the upper surface of the large plate, a movable module is installed on the upper surface of the welding base plate, a module connecting plate is provided on the outer wall of the movable module, and a laser lens is provided inside the module connecting plate, with the laser lens facing the first and second collectors.

[0015] Preferably, a base plate two and a cylinder mounting plate are installed on the upper surface of the large plate, the outer wall of the base plate two is installed on the outer wall of the cylinder mounting plate, a cylinder three is installed on the outer wall of the cylinder mounting plate, and a hook is provided at the output end of the cylinder three, with the bend of the hook located on the upper side of the support plate one.

[0016] Preferably, a reinforcing plate is provided on the upper surface of the workstation conversion base plate, and a cylinder fixing plate is installed on the outer wall of the reinforcing plate. Cylinder four is installed on each of the two outer walls of the cylinder fixing plate. The output end of cylinder four passes through the interior of the cylinder fixing plate and is provided with a push head two. The position of push head two corresponds to that of push rod.

[0017] By adopting the above technical solution, the overall frame is highly rigid and not easily deformed during operation through the cooperation of the base plate, upright plate, multiple sets of reinforcing ribs, and various mounting plates. This ensures the positional accuracy and verticality of each cylinder and moving part. Cylinder 1 pushes the support plate 1 through push head 1, pressing the battery cell upwards to the cover plate reference surface from below. Cylinder 2 drives the pressure head to press the current collector plate downwards, making the current collector plate and battery cell fit tightly together, while fixing their vertical positions and eliminating assembly gaps. The laser machine lens is precisely positioned by the moving module, and the distance between the lens and the welding surface remains consistent, achieving a constant welding focal length and effectively improving the welding consistency of different workpieces.

[0018] This invention provides an automatic centering welding fixture mechanism for battery cells. It has the following advantages:

[0019] 1. This invention uses a welding fixture mechanism to automatically center the workpiece, which can accurately center and position battery cells of different diameters. At the same time, the fixture adopts a vertical design. With the cooperation of V-shaped wheels and cover plates, the positioning center of different battery cell sizes can be ensured to be concentric with the positioning center of the current collector, thereby keeping the battery cell and the current collector in a coaxial state and avoiding welding deviation, deviation and falling off.

[0020] 2. In this invention, the end of the battery cell is tightly attached to the positioning plate of the current collector by the tension spring. The welding head is positioned by the stroke of the cylinder and pushes the current collector and the battery cell out by 0.5mm in the opposite direction, so that the current collector and the battery cell are tightly attached. This ensures that the focal length is consistent during each welding of the current collector and ensures the consistency of the welding of the current collector.

[0021] 3. The present invention uses a clamp to keep the relative position of the battery cell and the current collector fixed during clamping. After the main body of the welding clamping mechanism clamps the battery cell and the current collector, the position of the battery cell and the current collector will not change during the station transfer. Therefore, the battery cell and the current collector can be loaded, clamped and welded at different stations, which greatly improves the welding efficiency of the equipment. In addition, the structure is compact and occupies a small space. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a top view of the welding fixture mechanism of the present invention;

[0024] Figure 3 This is a partial structural diagram of the motherboard of the present invention;

[0025] Figure 4 This is a partial structural diagram of the plug screw of the present invention;

[0026] Figure 5 This is a schematic diagram of a partial structure of the laser camera lens of the present invention;

[0027] Figure 6 This is a partial structural diagram of the hook of the present invention.

[0028] The components include: 1. Large plate; 2. Main body of welding fixture mechanism; 3. Pressure collector plate mechanism; 4. Laser welding machine mechanism; 5. Station 1; 6. Station 2; 7. Collector plate 1; 8. Collector plate 2; 9. Fixture fixing plate; 10. Bearing fixing plate; 11. Main plate; 12. Linear bearing 1; 13. Support column 1; 14. Slide rail; 15. Slider; 16. Sliding guide assembly; 17. Support plate 1; 18. Support column 2; 19. Support column 3; 20. Tension spring; 21. V-shaped wheel; 22. Cover plate; 23. Push rod; 24. Washer 1; 25. Helical spring; 26. Linear bearing 2; 27. Washer 2; 28. Reinforcing rib 1 29. Gripper 1; 30. Gripper 2; 31. Connecting rod 1; 32. Connecting rod 2; 33. Plug screw; 34. Base plate 1; 35. Vertical plate; 36. Reinforcing rib 2; 37. Support plate 2; 38. Cylinder 1; 39. Push head 1; 40. Cylinder 2; 41. Cylinder connecting plate; 42. Pressure head; 43. Welding base plate; 44. Moving module; 45. Module connecting plate; 46. Laser machine lens; 47. Base plate 2; 48. Cylinder mounting plate; 49. Cylinder 3; 50. Hook; 51. Reinforcing plate; 52. Cylinder fixing plate; 53. Cylinder 4; 54. Push head 2; 55. Workstation conversion base plate; 56. Battery cell body. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0030] Please see the appendix Figure 1 -Appendix Figure 6 This invention provides an automatic cell centering welding fixture mechanism, including a large plate 1. A current collector mechanism 3 and a laser welding mechanism 4 are respectively mounted on the upper surface of the large plate 1. A welding fixture mechanism body 2 is arranged outside the current collector mechanism 3. The welding fixture mechanism body 2 includes a main plate 11. A fixture fixing plate 9 is installed inside the main plate 11. A bearing fixing plate 10 is installed on the upper surface of the fixture fixing plate 9. A linear bearing 26 is installed inside the bearing fixing plate 10. A push rod 23 is slidably connected to the inner side of the linear bearing 26. A plug screw 33 is provided inside the push rod 23 and connected to a connecting rod 31 and a connecting rod 32. A clamping jaw 29 and a clamping jaw 30 are respectively installed inside the connecting rod 31 and the connecting rod 32. A linear bearing 12 is installed inside the clamping jaw 29. A support column 13 is installed on the inner wall of the linear bearing 12. A V-shaped support is installed on the outer wall of the support column 13. The outer wall of the V-shaped wheel 21 is provided with the cell body 56; the two sides of the main board 11 are respectively provided with station 1 5 and station 2 6; the lower surface of the fixture fixing plate 9 is provided with station conversion base plate 55; the lower surface of the cell body 56 is provided with support plate 17; the outer wall of support plate 17 is provided with sliding guide component 16; the outer wall of sliding guide component 16 is provided with the outer wall of the main board 11; the inside of support plate 17 is provided with support column 3 19; the inside of support column 3 19 is provided with one end of tension spring 20; the other end of tension spring 20 is provided with support column 2 18; the outer wall of support column 2 18 is provided with the inside of the main board 11; the inside of gripper 1 29 is provided with slider 15; the inner wall of slider 15 is slidably connected with slide rail 14; the upper surfaces of the two cell bodies 56 are respectively provided with collector plate 1 7 and collector plate 2 8; the outer walls of collector plate 1 7 and collector plate 2 8 are both provided with cover plate 22.

[0031] Specifically, since the first collector plate 7 and the second collector plate 8 have the same shape, a corresponding groove is made in the cover plate 22 according to the shape of the first collector plate 7, and it is slightly larger than the first collector plate 7, with a chamfered opening to facilitate the insertion of the first collector plate 7 into the groove of the cover plate 22. The V-shaped wheel 21 adopts a V-shaped design, with station 5 as one group and station 6 as another group, i.e., the two sides of the main board 11. The structures of the two station components are identical, allowing them to work simultaneously or separately. The push rod 23 at each station interacts with each... At the perpendicular position of the center line, push rod 23 is connected to connecting rod 1 31 and connecting rod 2 32 via a screw 33. Connecting rod 1 31 is also connected to jaw 1 29, and connecting rod 2 32 is also connected to jaw 2 30 via screw 33. The smooth center section of screw 33 allows connecting rod 1 31 and connecting rod 2 32 to rotate inside push rod 23, thereby transmitting power to jaw 1 29 and jaw 2 30. The smooth center section of screw 33 also allows connecting rod 1 31 and jaw 1 29, and connecting rod 2 32 and jaw 2 30 to rotate. The rotation at the point causes grippers 29 and 30 to move in opposite directions. The lower thread of the plug screw 33 ensures a secure connection between the components. The slide rail 14 and slider 15 support and limit the movement of grippers 29 and 30. Each set of V-shaped wheels 21 is connected to grippers 29 and 30 respectively via a support column 13 and a linear bearing 12. When the push rod 23 is in the retracted state, grippers 29 and 30 move at an angle perpendicular to the push rod 23. The core wires converge in the center, and two sets of V-shaped wheels 21 clamp the battery cell body 56 from four directions. With the battery cell body 56 as the center, the core wires wrap around and clamp the battery cell body 56 to prevent it from swaying. The battery cell body 56 is clamped by four sets of V-shaped wheels 21 from top to bottom. Even if the size of the battery cell body 56 is different, it can ensure that the positioning center of different battery cell bodies 56 is consistent with the positioning center of the current collector. At the same time, it solves the problem of the incoming diameter of the battery cell body 56 is different and also prevents the battery cell body 56 from running off course and falling off. The sliding guide assembly 16, composed of a conventional slide and guide rail, is vertically positioned to limit the vertical movement of the support plate 17, preventing it from tilting and ensuring that the top of the support plate 17 is horizontal, thus stably supporting the battery cell body 56. The tension spring 20 ensures that the support plate 17 is initially in a suitable position and provides a restoring force after the support plate 17 is moved by external force. At the same time, the elastic force of the tension spring 20 presses against the support plate 17 to support the battery cell body 56, causing the upper end of the battery cell body 56 to press against the cover plate 22.

[0032] Please see the appendix Figure 2 -Appendix Figure 4The outer wall of the cover plate 22 is installed on the outer wall of the main board 11, the outer wall of the slide rail 14 is installed on the outer wall of the main board 11, the current collector 7 and the current collector 8 correspond to the battery cell body 56, and the reinforcing rib 28 is installed between the bearing fixing plate 10, the clamp fixing plate 9 and the main board 11.

[0033] Specifically, the main board 11 provides fixation for the slide rail 14 and the cover plate 22. The positions of the current collector 7 and the current collector 8 correspond to the battery cell bodies 56 on both sides, ensuring that they are aligned vertically. This ensures accurate welding point positioning during laser welding and avoids welding misalignment or incomplete welding. The setting of the reinforcing rib 28 strengthens the connection between the bearing fixing plate 10, the clamp fixing plate 9 and the main board 11, thereby improving structural rigidity.

[0034] Please see the appendix Figure 3 A washer 27 is installed on the outer wall of linear bearing 26. One end of a helical spring 25 is installed on the outer wall of washer 27. A washer 24 is installed on the other end of helical spring 25. The interior of washer 24 is installed on the outer wall of push rod 23.

[0035] Specifically, the linear bearing 26 and washer 27 are fixed in position, and the helical spring 25 is connected to washer 24. Washer 24 and push rod 23 form a whole and can move horizontally. The linear bearing 26 supports and limits the movement of push rod 23. The helical spring 25 provides a restoring force to push rod 23 after it is moved by external force, so that it returns to its original position.

[0036] Please see the appendix Figure 1 -Appendix Figure 5 The pressure collector mechanism 3 includes a vertical plate 35, the lower surface of which is mounted on the upper surface of the large plate 1. A base plate 34 is provided inside the vertical plate 35 and the large plate 1. A support plate 37 is mounted on the upper surface of the vertical plate 35. A reinforcing rib 36 is provided between the support plate 37 and the vertical plate 35. A cylinder 38 is mounted on the upper surface of the support plate 37. A push head 39 is provided at the output end of the cylinder 38. The push head 39 is located below the support plate 17. A cylinder 40 is mounted on the outer wall of the vertical plate 35. A cylinder connecting plate 41 is provided at the output end of the cylinder 40. A pressure head 42 is provided on the lower surface of the cylinder connecting plate 41. The pressure head 42 is located above the cover plate 22.

[0037] Specifically, the bottom plate 34, the upright plate 35, the reinforcing rib 36, and the support plate 37 are set to strengthen the stability of the lower side of the upright plate 35 so that it can be installed on the upper side of the large plate 1. The shape of the lower side of the pressure head 42 corresponds to the current collector 7 and the current collector 8. When the cylinder 38 extends, the push head 39 lifts the support plate 17 and clamps the battery cell body 56 upward and backward with the cover plate 22 as the reference. The cylinder 40 is connected to the pressure head 42 through the cylinder connecting plate 41. When the cylinder 40 extends downward, the pressure head 42 passes through the inside of the cover plate 22 and presses the current collector 7, the current collector 8, and the battery cell body 56 downward by 0.5mm, so that the current collector 7, the current collector 8 and the battery cell body 56 are in close contact with the battery cell body 56.

[0038] Please see the appendix Figure 5 A welding base plate 43 is installed on the upper surface of the large plate 1. A movable module 44 is installed on the upper surface of the welding base plate 43. A module connecting plate 45 is provided on the outer wall of the movable module 44. A laser lens 46 is provided inside the module connecting plate 45. The laser lens 46 faces the first collector plate 7 and the second collector plate 8.

[0039] Specifically, the laser machine itself is moved by the moving module 44 using conventional moving parts so that the position of the laser machine lens 46 corresponds to the current collector 7 and the current collector 8. Through the movement of the above structure, the distance between the laser machine lens 46 and the position of the current collector 7 or the current collector 8 is constant, ensuring the consistency of the welding focal length of different battery cell bodies 56 and the current collector 7 or the current collector 8.

[0040] Please see the appendix Figure 6 The upper surface of the large plate 1 is equipped with a base plate 2 47 and a cylinder mounting plate 48. The outer wall of the base plate 2 47 is installed on the outer wall of the cylinder mounting plate 48. The outer wall of the cylinder mounting plate 48 is equipped with a cylinder 3 49. The output end of the cylinder 3 49 is provided with a hook 50. The bend of the hook 50 is located on the upper side of the support plate 1 17. The upper surface of the workstation conversion base plate 55 is equipped with a reinforcing plate 51. The outer wall of the reinforcing plate 51 is equipped with a cylinder fixing plate 52. The outer walls on both sides of the cylinder fixing plate 52 are respectively equipped with cylinder 4 53. The output end of the cylinder 4 53 passes through the interior of the cylinder fixing plate 52 and is equipped with a push head 2 54. The position of the push head 2 54 corresponds to that of the push rod 23.

[0041] Specifically, the base plate 47 and cylinder mounting plate 48 serve as replacement structures for the upright plate 35, base plate 34, reinforcing rib 36, and support plate 37. The connection structure of base plate 47 is located on the rear side of support plate 17, while the connection structure of upright plate 35 is located on the upper and lower sides of support plate 17 and main board 11, without affecting the use of each drive component. The upper end of support plate 17 can support the battery cell body 56, and the lower end can be hooked and pulled down by hook 50. The battery cell body 56 is lowered and removed to prevent the upper end of the battery cell body 56 from rubbing against the cover plate 22 when it is removed. The lower end of the support plate 17 can also be pushed up by the push head 39, using the cover plate 22 as a reference, so that the upper end of the battery cell body 56 is pressed tightly against the cover plate 22. When the cylinder 3 49 retracts, the hook 50 pulls the support plate 17 downward. When the cylinder 4 53 is pushed out, the push head 2 54 pushes the push rod 23 tightly, and the coil spring 25 is compressed by the washer 24. Tighten the cylinder to push the connecting rod 31 and the connecting rod 32, causing the gripper 29 and the gripper 30 to slide left and right, opening the four sets of V-shaped wheels 21 left and right, placing the battery cell body 56 between the four sets of V-shaped wheels 21. The cylinder 4 retracts, the gripper 29 and the gripper 30 close together, and the four sets of V-shaped wheels 21 wrap around and clamp the battery cell body 56 from four directions. The four sets of V-shaped wheels 21, like fingers, support the battery cell body 56 to stand upright, without pinching or injuring it. When the cylinder 3 extends, the hook 50 lifts up, and the support plate 17 is pulled back by the tension spring 20. After moving upward through the sliding guide assembly 16, the upper end of the battery cell body 56 is pressed against the cover plate 22 in the opposite direction. Here, the two ends of the tension spring 20 are installed through the support column 2 18 and the support column 3 19, allowing the tension spring 20 to be installed and removed so that the operator can use an elastic component with appropriate elasticity to ensure that the support plate 17 generates appropriate upward pressure.

[0042] Workflow: Each drive component is initially in its initial state. The helical spring 25 pulls the push rod 23 to reset. The two sets of grippers 29 and 30 drive the V-shaped wheel 21 to close in the center. The tension spring 20 keeps the support plate 17 in the upper position. The cylinder 53 extends. The push head 54 drives the push rod 23. Through the transmission of the connecting rod 31 and 32, the grippers 29 and 30 are driven to open to both sides. The V-shaped wheel 21 opens, placing the battery cell body 56 on the support plate 17. Then the cylinder 53 retracts, and the push rod 23 resets under the action of the helical spring 25. The V-shaped wheel 21 surrounds and clamps the battery cell body 56 from all sides, automatically completing the centering and positioning, and adapting to the outer diameter deviation of the battery cell body 56.

[0043] Collector plate 7 and collector plate 8 are placed into the grooves of the cover plate 22 at the corresponding workstations. With the help of the structure, collector plate 7 and collector plate 8 are precisely coaxially aligned with the battery cell body 56 below. Cylinder 38 extends and push head 39 pushes support plate 17 upward, pressing battery cell body 56 tightly against the lower surface of cover plate 22. At the same time, cylinder 40 extends and drives pressure head 42 to press down through cylinder connecting plate 41, pressing collector plate 7 and collector plate 8 with battery cell body 56, eliminating assembly gaps and fixing the vertical position of the workpiece.

[0044] The moving module 44 adjusts the position of the laser machine lens 46 to maintain a constant welding focal length. The lens emits a laser to complete the welding process between the current collector 7 or the current collector 8 and the battery cell body 56. After welding, cylinders 38 and 40 retract in sequence, the pusher 39 and the pressure head 42 release the clamping, and cylinder 53 extends again, driving the push rod 23 to open the V-wheel 21 and release the clamping on the battery cell body 56. Cylinder 49 retracts, driving the hook 50 to pull down the support plate 17, causing the battery cell body 56 to move down as a whole and leave the cover plate 22 to prevent friction and scratches during material handling. Then, the welded workpiece is taken out. Finally, cylinder 49 extends, the hook 50 resets, and the support plate 17 rises back to its initial position under the elastic force of the tension spring 20. All components return to the standby state and, in conjunction with the station conversion base plate 55, switch stations to prepare for the next round of work.

[0045] 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. An automatic centering welding fixture mechanism for battery cells, comprising a large plate (1), characterized in that, The upper surface of the large plate (1) is respectively equipped with a pressure collector plate mechanism (3) and a laser welding mechanism (4). The outer side of the pressure collector plate mechanism (3) is provided with a welding fixture mechanism body (2). The welding fixture mechanism body (2) includes a main plate (11). A fixture fixing plate (9) is installed inside the main plate (11). A bearing fixing plate (10) is installed on the upper surface of the fixture fixing plate (9). A linear bearing (26) is installed inside the bearing fixing plate (10). A pusher is slidably connected to the inner side of the linear bearing (26). The push rod (23) has a plug screw (33) inside and is connected to a connecting rod one (31) and a connecting rod two (32). The connecting rod one (31) and the connecting rod two (32) are respectively equipped with a clamping jaw one (29) and a clamping jaw two (30). The clamping jaw one (29) is equipped with a linear bearing one (12). The inner wall of the linear bearing one (12) is equipped with a support column one (13). The outer wall of the support column one (13) is equipped with a V-shaped wheel (21). The outer wall of the V-shaped wheel (21) is equipped with a battery cell body (56).

2. The automatic cell centering welding fixture mechanism according to claim 1, characterized in that, The main board (11) has a work station 1 (5) and a work station 2 (6) on its two sides respectively. The lower surface of the fixture fixing plate (9) is equipped with a work station conversion base plate (55). The lower surface of the battery cell body (56) is equipped with a support plate 1 (17). The outer wall of the support plate 1 (17) is equipped with a sliding guide assembly (16). The outer wall of the sliding guide assembly (16) is set on the outer wall of the main board (11). The support plate 1 (17) is equipped with a support column 3 (19). The support column 3 (19) is equipped with a support column 4 (19). One end of the tension spring (20) is equipped with a support column (18), the other end of the tension spring (20) is equipped with a support column (18), the outer wall of the support column (18) is installed inside the main board (11), the inside of the gripper (29) is equipped with a slider (15), the inner wall of the slider (15) is slidably connected with a slide rail (14), the upper surfaces of the battery cell body (56) on both sides are respectively provided with a collector plate (7) and a collector plate (8), and the outer walls of the collector plate (7) and the collector plate (8) are both provided with a cover plate (22).

3. The automatic cell centering welding fixture mechanism according to claim 2, characterized in that, The outer wall of the cover plate (22) is installed on the outer wall of the main board (11), the outer wall of the slide rail (14) is installed on the outer wall of the main board (11), the first collector plate (7) and the second collector plate (8) correspond to the main body of the battery cell (56), and a reinforcing rib (28) is installed between the bearing fixing plate (10), the clamp fixing plate (9) and the main board (11).

4. The automatic cell centering welding fixture mechanism according to claim 1, characterized in that, The outer wall of the second linear bearing (26) is fitted with a second washer (27), and one end of a helical spring (25) is fitted on the outer wall of the second washer (27). The other end of the helical spring (25) is fitted with a first washer (24), and the interior of the first washer (24) is fitted on the outer wall of the push rod (23).

5. The automatic cell centering welding fixture mechanism according to claim 1, characterized in that, The pressure collecting plate mechanism (3) includes a vertical plate (35), the lower surface of which is mounted on the upper surface of the large plate (1). A bottom plate (34) is provided inside the vertical plate (35) and the large plate (1). A support plate (37) is mounted on the upper surface of the vertical plate (35). A reinforcing rib (36) is provided between the support plate (37) and the vertical plate (35).

6. The automatic cell centering welding fixture mechanism according to claim 5, characterized in that, A cylinder (38) is mounted on the upper surface of the second support plate (37), and a pusher (39) is provided at the output end of the cylinder (38). The pusher (39) is located on the lower side of the first support plate (17).

7. The automatic cell centering welding fixture mechanism according to claim 5, characterized in that, The outer wall of the upright plate (35) is equipped with a second cylinder (40), and the output end of the second cylinder (40) is provided with a cylinder connecting plate (41). The lower surface of the cylinder connecting plate (41) is provided with a pressure head (42), and the pressure head (42) is located on the upper side of the cover plate (22).

8. The automatic cell centering welding fixture mechanism according to claim 1, characterized in that, A welding base plate (43) is installed on the upper surface of the large plate (1), and a moving module (44) is installed on the upper surface of the welding base plate (43). A module connecting plate (45) is provided on the outer wall of the moving module (44), and a laser lens (46) is provided inside the module connecting plate (45). The laser lens (46) faces the first collector plate (7) and the second collector plate (8).

9. The automatic cell centering welding fixture mechanism according to claim 1, characterized in that, The upper surface of the large plate (1) is equipped with a base plate two (47) and a cylinder mounting plate (48). The outer wall of the base plate two (47) is installed on the outer wall of the cylinder mounting plate (48). The outer wall of the cylinder mounting plate (48) is equipped with a cylinder three (49). The output end of the cylinder three (49) is provided with a hook (50). The bend of the hook (50) is located on the upper side of the support plate one (17).

10. The automatic cell centering welding fixture mechanism according to claim 2, characterized in that, The upper surface of the workstation conversion base plate (55) is provided with a reinforcing plate (51). A cylinder fixing plate (52) is installed on the outer wall of the reinforcing plate (51). Cylinder four (53) is installed on the outer walls of both sides of the cylinder fixing plate (52). The output end of the cylinder four (53) passes through the interior of the cylinder fixing plate (52) and is provided with a push head two (54). The position of the push head two (54) corresponds to that of the push rod (23).

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