Lithium battery liquid injection hole laser automatic sealing machine

Abstract

The utility model belongs to lithium cell liquid injection hole sealing technology field especially, it is a kind of lithium cell liquid injection hole laser automatic sealing machine, including welding unit bottom plate, three welding unit bottom plates are linear parallel arrangement distribution, and the bottom of welding unit bottom plate is also equipped with universal wheel, and the top center of three welding unit bottom plates is provided with conveying mechanism. This lithium cell liquid injection hole laser automatic sealing machine, this lithium cell liquid injection hole laser automatic sealing machine constructs an efficient, stable, intelligent complete production solution through the modularization, automation precision design. Its core advantage lies in: first, whole production line adopts the gradual type sectional welding strategy of " prewelding-full welding-detection", effectively controls thermal stress, ensures the stability and sealing property of welding quality.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery injection hole sealing technology, and in particular to a lithium battery injection hole automatic laser sealing machine. Background Technology

[0002] In the field of lithium battery manufacturing, the sealing process after electrolyte injection is a crucial step determining the battery's safety, consistency, and reliability. In the packaging process of power batteries, the welding of the sealing pins is the final critical step in cell preparation. Its welding quality directly determines the battery's sealing performance, safety, and cycle life, making its yield particularly important. However, this process faces severe technical challenges. Because residual electrolyte inevitably remains around the sealing pins after electrolyte injection, it easily vaporizes at the high temperature during welding, forming internal high-pressure gas. This can lead to severe splashing, explosions, and fatal defects such as microscopic pinholes. These defects compromise the battery's integrity, becoming the root cause of safety hazards such as internal short circuits and thermal runaway. Therefore, an automated laser sealing machine for lithium battery electrolyte injection holes is needed. Utility Model Content

[0003] Based on existing technical problems, this utility model proposes an automatic laser sealing machine for lithium battery injection holes.

[0004] This utility model proposes an automatic laser sealing machine for lithium battery injection holes, including a welding unit base plate. The three welding unit base plates are arranged in a linear parallel distribution, and the bottom of each welding unit base plate is equipped with casters. A conveying mechanism is set at the top center of each of the three welding unit base plates. The three conveying mechanisms are connected end to end. Each conveying mechanism includes a conveying frame, and a square lithium battery is placed inside the conveying frame. Multiple square lithium batteries are arranged in a rectangular array inside the conveying frame. The conveying frame is used for conveying above the conveying mechanism.

[0005] A pre-welding mechanism is also provided on the top of the base plate of the welding unit, which realizes the action of pre-welding three points of the square lithium battery filling hole cap.

[0006] A sealing welding mechanism is also provided on the top of the bottom plate of the middle welding unit, which realizes the action of fully welding the square lithium battery filling hole.

[0007] The top of the last welding unit base plate is also provided with an appearance inspection mechanism, which performs the appearance inspection action after the square lithium battery filling hole cap is welded.

[0008] The right end of the bottom plate of the last welding unit is also provided with a turning and waiting mechanism, which realizes the action of turning the square lithium battery that has passed the appearance inspection mechanism to wait for material.

[0009] Preferably, the conveying mechanism further includes a conveying base installed at the top center of the welding unit base plate. Vertical poles are fixedly installed around the top of the conveying base. A conveying crossbar is fixedly installed on the top of every two vertical poles. The two conveying crossbars are arranged in parallel. A transfer conveying groove is opened on the top surface of the conveying crossbar. A conveying wheel is rotatably connected to the inner wall of the transfer conveying groove. Multiple conveying wheels are linearly arranged on the surface of the conveying crossbar, and the bottom of the conveying frame is slidably inserted into the surface of the conveying wheel.

[0010] The top perimeter of the conveying base is also fixedly installed with first telescopic rods, and the top center of the conveying base is fixedly installed with a first telescopic cylinder. The telescopic top end of the first telescopic cylinder is fixedly installed with a support plate. The support plate is located at the bottom of the conveying frame, and the telescopic top ends of the four first telescopic rods are all fixedly installed with the bottom of the support plate.

[0011] A connecting base plate is fixedly installed at the bottom left end of each of the two conveying crossbars. A limit telescopic cylinder is fixedly installed at the top center of the connecting base plate. A connecting column is also fixedly installed at the top of the connecting base plate. A hinge seat is fixedly installed at the top of the connecting column. A pressing limit block is rotatably connected to the inner wall of one end of the hinge seat via a pin. The telescopic top end of the limit telescopic cylinder passes through and extends to the top of the hinge seat, and contacts one bottom side of the pressing limit block. A roller is rotatably connected to the other end surface of the pressing limit block via a pin. The surface of the roller contacts the surface of the conveying frame.

[0012] Preferably, the pre-welding mechanism includes a first support column installed on the top of the welding unit base plate. Every two first support columns form a group. A first X-axis module is fixedly installed on the top of each group of first support columns. The first X-axis module drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the X direction. The two first X-axis modules are arranged in parallel, and a first Y-axis module is installed on the two lead sleeve surfaces of the two first X-axis modules. The first Y-axis module drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Y direction. A first vertical plate is installed on the lead sleeve surface of the first Y-axis module. A first Z-axis module is installed on the surface of the first vertical plate. The first Z-axis module drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Z direction. A first vertical slide rail is also fixedly installed on the surface of the first vertical plate. A first vertical slider is slidably inserted into the surface of the first vertical slide rail. A first sliding plate is fixedly installed on the surface of the first vertical slider and the lead sleeve surface of the first Z-axis module. A first industrial camera is installed at one end of the first sliding plate, and a first exhaust pipe and a first ultraviolet laser welding head are respectively installed at the other end of the first sliding plate.

[0013] The top of the welding unit base plate is also fixedly installed with an installation base. The two installation bases are arranged symmetrically. The top of the installation base is fixedly installed with a second telescopic rod and a second telescopic cylinder. The second telescopic cylinder is located between the two second telescopic rods. The telescopic top ends of the two second telescopic cylinders are fixedly installed with positioning welding plates. The positioning welding plates are located on the top of the conveying frame, and the holes on the surface of the positioning welding plates are movably connected with the surface of the square lithium battery terminal placed inside the conveying frame. The telescopic top ends of the multiple second telescopic rods are fixedly installed with the bottom end of the positioning welding plate.

[0014] Preferably, the sealing welding mechanism includes a second support column installed on the top of the welding unit base plate. Every two second support columns form a group. A second X-axis module is fixedly installed on the top of each group of second support columns. The second X-axis module drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the X-axis. The two second X-axis modules are arranged in parallel, and a second Y-axis module is installed on the surface of each lead sleeve of the two second X-axis modules. The second Y-axis module drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Y-axis. A second vertical plate is installed on the surface of the lead sleeve of the second Y-axis module. A second Z-axis module is installed on the surface of the second vertical plate. The second Z-axis module drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Z-axis. A second vertical slide rail is also fixedly installed on the surface of the second vertical plate. A second vertical slider is slidably inserted into the surface of the second vertical slide rail. A second sliding plate is fixedly installed on the surface of the second vertical slider and the surface of the lead sleeve of the second Z-axis module. A second industrial camera is installed at one end of the second sliding plate, and a second exhaust pipe and a second ultraviolet laser welding head are respectively installed at the other end of the second sliding plate.

[0015] Preferably, the appearance inspection mechanism includes a third support column installed on the top of the welding unit base plate. Every two third support columns form a group, and a third X-axis module is fixedly installed on the top of each group of third support columns. The third X-axis module drives a lead screw to rotate via a motor, thereby driving the lead sleeve to move in the X-axis direction. The two third X-axis modules are arranged in parallel, and a third Y-axis module is installed on the surface of each lead sleeve of the two third X-axis modules. The third Y-axis module drives a lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Y-axis direction. A third vertical plate is installed on the surface of the lead sleeve of the third Y-axis module. A third Z-axis module is mounted on the surface of the plate. The third Z-axis module drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Z-axis. A third vertical slide rail is also fixedly mounted on the surface of the third vertical plate. A third vertical slider is slidably inserted into the surface of the third vertical slide rail. A third sliding plate is fixedly mounted on the surface of the third vertical slider and the surface of the lead sleeve of the third Z-axis module. A third industrial camera is mounted on one end of the third sliding plate, and a material unloading robot is mounted on the other end of the third sliding plate. A waste receiving box is also fixedly mounted on the top of the welding unit base plate. The waste receiving box is located at the bottom of the material unloading robot.

[0016] Preferably, the turning and waiting mechanism includes a material transfer base, a limit plate is fixedly installed on one side of the top of the material transfer base, a universal conveying ball is installed on the top of the material transfer base, and multiple universal conveying balls are distributed in a rectangular array on the top of the material transfer base. A cylinder base plate is also fixedly installed on the top of the other side of the material transfer base. A pusher telescopic cylinder is fixedly installed on the surface of the cylinder base plate, and a pusher plate is fixedly installed on the telescopic end of the pusher telescopic cylinder. The surface of the pusher plate is in contact with the surface of the conveying frame.

[0017] Preferably, a waiting base is provided on one side of the transfer base, and a waiting bottom plate is fixedly installed on the top of the waiting base. Both ends of the top of the waiting bottom plate are rotatably connected to waiting conveying rollers through bearings, and the qualified square lithium battery placement conveying frame is located above the waiting conveying rollers.

[0018] The beneficial effects of this utility model are as follows:

[0019] This automated laser sealing machine for lithium battery injection holes, through its modular and automated precision design, constructs a complete, efficient, stable, and intelligent production solution. Its core advantages are: First, the entire production line adopts a progressive, segmented welding strategy of "pre-welding - full welding - inspection," effectively controlling thermal stress and ensuring the stability and sealing of welding quality. Second, the conveying system integrates three major functions: stable support, dynamic correction, and flexible limiting, providing a solid foundation for high-precision operations. Simultaneously, the use of universal balls and conveyor rollers achieves smooth turning and transition, maximizing product protection. Third, the three core units—pre-welding, sealing, and inspection—all employ high-precision three-axis modules and industrial vision systems, achieving full automation and data-driven processes from positioning and welding to quality inspection, completely eliminating manual intervention and significantly improving production efficiency and product consistency. Finally, through the intelligent linkage between the unloading robot and the waste bin, automatic product sorting and immediate isolation of defective products are achieved, forming a complete closed-loop quality control system. This equipment not only significantly improves production capacity and yield, but also represents the technological advancement in the lithium battery manufacturing field with its high degree of integration and intelligence. Attached Figure Description

[0020] Figure 1 A schematic diagram of a laser automatic sealing machine for lithium battery injection holes;

[0021] Figure 2 A perspective view of the pre-welding mechanism of a laser automatic sealing machine for lithium battery injection holes;

[0022] Figure 3 A three-dimensional view of the base plate structure of a welding unit for an automatic laser sealing machine for lithium battery injection holes;

[0023] Figure 4 A perspective view of the conveying mechanism of an automatic laser sealing machine for lithium battery injection holes;

[0024] Figure 5 A perspective view of the sealing mechanism of an automatic laser sealing machine for lithium battery injection holes;

[0025] Figure 6 A perspective view of the appearance inspection mechanism of a laser automatic sealing machine for lithium battery injection holes;

[0026] Figure 7 A three-dimensional view of the conveyor frame structure of an automatic laser sealing machine for lithium battery injection holes;

[0027] Figure 8 A perspective view of the steering and material waiting mechanism of a laser automatic sealing machine for lithium battery injection holes;

[0028] Figure 9 An automatic laser sealing machine for lithium battery injection holes Figure 2 Enlarged view of the structure at point A in the middle.

[0029] In the diagram: 1. Welding unit base plate; 2. Casters; 3. Conveying mechanism; 31. Conveying frame; 32. Square lithium battery; 33. Conveying base; 34. Vertical pole; 35. Conveying crossbar; 36. Transfer conveying trough; 37. Conveying wheel; 38. First telescopic rod; 39. First telescopic cylinder; 310. Support plate; 311. Connecting base plate; 312. Limiting telescopic cylinder; 313. Connecting column; 314. Hinge seat; 315. Extrusion limiting block; 316. Roller 4. Pre-welding mechanism; 41. First support pole; 42. First X-axis module; 43. First Y-axis module; 44. First vertical plate; 45. First Z-axis module; 46. First vertical slide rail; 47. First vertical slider; 48. First sliding plate; 49. First industrial camera; 410. First exhaust pipe; 411. First ultraviolet laser welding head; 412. Mounting base; 413. Second telescopic rod; 414. Second telescopic cylinder; 415. Positioning welding plate; 5. Sealing and welding mechanism; 51. Second support column; 52. Second X-axis module; 53. Second Y-axis module; 54. Second vertical plate; 55. Second Z-axis module; 56. Second vertical slide rail; 57. Second vertical slider; 58. Second sliding plate; 59. Second industrial camera; 510. Second exhaust pipe; 511. Second ultraviolet laser welding head; 6. Appearance inspection mechanism; 61. Third support column; 62. Third X-axis module; 63. Third Y-axis module; 6 4. Third vertical plate; 65. Third Z-axis module; 66. Third vertical slide rail; 67. Third vertical slider; 68. Third sliding plate; 69. Third industrial camera; 610. Unloading robot; 611. Waste receiving box; 7. Turning waiting mechanism; 71. Transfer base; 72. Limit plate; 73. Universal conveyor ball; 74. Cylinder base plate; 75. Pushing telescopic cylinder; 76. Pushing plate; 77. Waiting base; 78. Waiting base plate; 79. Waiting conveyor roller. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0031] Reference Figures 1-9An automatic laser sealing machine for lithium battery injection holes includes a welding unit base plate 1. Three welding unit base plates 1 are arranged in a linear parallel arrangement, and universal wheels 2 are installed at the bottom of the welding unit base plate 1. A conveying mechanism 3 is set at the top center of each of the three welding unit base plates 1. The three conveying mechanisms 3 are connected end to end. The conveying mechanism 3 includes a conveying frame 31. A square lithium battery 32 is placed inside the conveying frame 31. Multiple square lithium batteries 32 are arranged in a rectangular array inside the conveying frame 31. The conveying frame 31 is used for conveying above the conveying mechanism 3.

[0032] Specifically, this is implemented by connecting the two ends of the conveyor mechanism 3 to form a closed loop or continuous production line, avoiding manual intervention and realizing the fully automatic flow of lithium batteries from feeding to sealing; adopting a progressive welding and segmented welding strategy, gradually increasing the welding energy, so that the material gradually adapts to the heat accumulation, avoiding the surge in internal pressure caused by instantaneous high temperature.

[0033] The conveying mechanism 3 also includes a conveying base 33 installed at the top center of the welding unit base plate 1. Vertical poles 34 are fixedly installed around the top of the conveying base 33. A conveying crossbar 35 is fixedly installed on the top of every two vertical poles 34. The two conveying crossbars 35 are arranged in parallel. A transfer conveying groove 36 is opened on the top surface of the conveying crossbar 35. A conveying wheel 37 is rotatably connected to the inner wall of the transfer conveying groove 36. Multiple conveying wheels 37 are linearly arranged on the surface of the conveying crossbar 35, and the bottom of the conveying frame 31 is slidably inserted into the surface of the conveying wheel 37.

[0034] The top of the conveying base 33 is also fixedly installed with first telescopic rods 38 around the top, and a first telescopic cylinder 39 is fixedly installed at the top center of the conveying base 33. The telescopic top of the first telescopic cylinder 39 is fixedly installed with a support plate 310. The support plate 310 is located at the bottom of the conveying frame 31, and the telescopic tops of the four first telescopic rods 38 are all fixedly installed with the bottom of the support plate 310.

[0035] A connecting base plate 311 is fixedly installed at the bottom left end of each of the two conveying crossbars 35. A limit telescopic cylinder 312 is fixedly installed at the top center of the connecting base plate 311. A connecting column 313 is also fixedly installed at the top of the connecting base plate 311. A hinge seat 314 is fixedly installed at the top of the connecting column 313. A pressing limit block 315 is rotatably connected to the inner wall of one end of the hinge seat 314 via a pin. The telescopic top end of the limit telescopic cylinder 312 passes through and extends to the top of the hinge seat 314 and contacts one side bottom of the pressing limit block 315. A roller 316 is rotatably connected to the other end surface of the pressing limit block 315 via a pin. The surface of the roller 316 contacts the surface of the conveying frame 31.

[0036] Specifically, this is implemented as follows: First, a rigid frame consisting of vertical poles 34, conveying crossbars 35, and linearly arranged conveying wheels 37 provides a stable, low-friction running track for the conveying frame 31, ensuring straightness and stability during long-distance conveying and laying a solid foundation for high-precision welding operations. Second, the bottom support plate 310 contacts the bottom of the conveying frame 31 through the first telescopic cylinder 39 and telescopic rod, forming a dynamic flexible support that effectively absorbs vibrations generated during conveying and provides strong upward support force, preventing the battery frame from deforming due to its own weight or external forces and ensuring the structural integrity of the product. Third, the dynamic limiting system at the front end drives the limiting block 315 through the limiting telescopic cylinder 312, using rollers 316 to flexibly limit and guide the conveying frame 31 laterally. This can correct minor deviations in the conveying path in real time, avoiding collisions and friction and ensuring conveying accuracy. In summary, this mechanism integrates three major functions: stable conveying, flexible support, and dynamic correction, significantly improving the operational stability, product yield, and production efficiency of the equipment.

[0037] A pre-welding mechanism 4 is also provided on the top of the welding unit base plate 1. The pre-welding mechanism 4 realizes the action of pre-welding three points of the filling hole cap of the square lithium battery 32. The pre-welding mechanism 4 includes a first support rod 41 installed on the top of the welding unit base plate 1. Every two first support rods 41 form a group. A first X-axis module 42 is fixedly installed on the top of each group of first support rods 41. The first X-axis module 42 drives the lead screw to rotate through the motor, thereby driving the lead sleeve to move in the X direction. The two first X-axis modules 42 are arranged in parallel, and a first Y-axis module 43 is installed on the two lead sleeve surfaces of the two first X-axis modules 42. The first Y-axis module 43 drives the lead screw to rotate through the motor, thereby driving the lead sleeve to move in the Y direction. A first vertical plate 44 is mounted on the surface of the threaded sleeve of the first Y-axis module 43. A first Z-axis module 45 is mounted on the surface of the first vertical plate 44. The first Z-axis module 45 drives the threaded sleeve to move in the Z-axis by rotating the lead screw driven by the motor. A first vertical slide rail 46 is also fixedly mounted on the surface of the first vertical plate 44. A first vertical slider 47 is slidably inserted into the surface of the first vertical slide rail 46. A first sliding plate 48 is fixedly mounted on the surface of the first vertical slider 47 and the threaded sleeve of the first Z-axis module 45. A first industrial camera 49 is mounted on one end of the first sliding plate 48. A first exhaust pipe 410 and a first ultraviolet laser welding head 411 are respectively mounted on the other end of the first sliding plate 48.

[0038] A mounting base 412 is also fixedly installed on the top of the welding unit base plate 1. The two mounting bases 412 are arranged symmetrically. A second telescopic rod 413 and a second telescopic cylinder 414 are fixedly installed on the top of the mounting base 412 respectively. The second telescopic cylinder 414 is located between the two second telescopic rods 413. A positioning welding plate 415 is fixedly installed on the telescopic top of the two second telescopic cylinders 414. The positioning welding plate 415 is located on the top of the conveying frame 31, and the holes on the surface of the positioning welding plate 415 are movably connected to the surface of the pole of the square lithium battery 32 placed inside the conveying frame 31. The telescopic tops of the multiple second telescopic rods 413 are fixedly installed to the bottom of the positioning welding plate 415.

[0039] Specifically, this is achieved through the ingenious combination of a high-precision motion module and a flexible positioning fixture, enabling efficient, precise, and reliable three-point pre-welding of the lithium battery injection hole cap. Its core advantages are: First, the industrial robot-level motion platform, composed of the first X, Y, and Z axis modules, can drive the first industrial camera 49 and the first ultraviolet laser welding head 411 to perform precise positioning along arbitrary trajectories in three-dimensional space. This ensures that the laser beam can stably act on the three predetermined points of the cap with micron-level precision, guaranteeing consistent welding quality, and the first exhaust pipe 410 removes welding fumes in real time, maintaining a clean working environment. Second, the bottom positioning welding plate 415, through the coordinated action of the second telescopic cylinder 414 and the second telescopic rod 413, achieves rapid and precise clamping and positioning of the lithium battery terminals within the conveying frame 31. This flexible clamping method not only firmly fixes the battery, preventing shaking during high-speed movement, but also avoids damage to the terminals that may be caused by rigid clamping, greatly improving positioning accuracy and operational safety. In summary, this design perfectly integrates high-precision automated welding with flexible workpiece positioning, which not only significantly improves production efficiency and welding quality, but also enhances the stability and adaptability of the system, making it a key technological guarantee for realizing the automated production of high-end lithium batteries.

[0040] A sealing welding mechanism 5 is also provided on the top of the base plate 1 of the middle welding unit. The sealing welding mechanism 5 realizes the action of fully welding the filling hole of the square lithium battery 32. The sealing welding mechanism 5 includes a second support rod 51 installed on the top of the welding unit base plate 1. Every two second support rods 51 form a group. A second X-axis module 52 is fixedly installed on the top of each group of second support rods 51. The second X-axis module 52 drives the lead screw to rotate through the motor, thereby driving the lead sleeve to move in the X direction. The two second X-axis modules 52 are arranged in parallel, and a second Y-axis module 53 is installed on the surface of the two lead sleeves of the two second X-axis modules 52. The second Y-axis module 53 drives the lead screw to rotate through the motor, thereby driving the lead sleeve to move in the Y direction. A second vertical plate 54 is mounted on the surface of the threaded sleeve of the second Y-axis module 53. A second Z-axis module 55 is mounted on the surface of the second vertical plate 54. The second Z-axis module 55 drives the threaded sleeve to move in the Z-axis by rotating the lead screw driven by the motor. A second vertical slide rail 56 is also fixedly mounted on the surface of the second vertical plate 54. A second vertical slider 57 is slidably inserted into the surface of the second vertical slide rail 56. A second sliding plate 58 is fixedly mounted on the surface of the second vertical slider 57 and the threaded sleeve surface of the second Z-axis module 55. A second industrial camera 59 is mounted on one end of the second sliding plate 58. A second exhaust pipe 510 and a second ultraviolet laser welding head 511 are respectively mounted on the other end of the second sliding plate 58.

[0041] Specifically, this is achieved through the design of a high-precision multi-axis module and integrated functional components, enabling precise, efficient, and high-quality full welding of the lithium battery filling hole cap. Its core advantages are: First, the precision motion platform composed of the second X, Y, and Z axis modules can drive the second industrial camera 59 and the second ultraviolet laser welding head 511 to perform precise movement and positioning along complex trajectories in three-dimensional space. This ensures that the laser beam can perform continuous and uniform full welding along the edge of the cap, forming a perfectly sealed weld and effectively eliminating the risk of leakage during battery use. Second, the second industrial camera 59, integrated on the second sliding plate 58, can perform high-precision visual positioning and guidance before welding, ensuring the absolute accuracy of the welding path; simultaneously, the second exhaust pipe 510 can remove metal vapor and fumes generated during the welding process in real time, preventing contamination of the optical lens and welding area, ensuring the stability of the welding process and the reliability of long-term operation. In summary, this system integrates high-precision automated welding, real-time visual inspection, and fume control, which not only significantly improves the consistency and sealing of welding quality but also substantially increases production efficiency and equipment automation. This is a key technological aspect for ensuring the safety and reliability of lithium batteries.

[0042] The top of the last welding unit base plate 1 is also equipped with an appearance inspection mechanism 6. The appearance inspection mechanism 6 performs appearance inspection after the welding of the liquid injection hole cap of the square lithium battery 32. The appearance inspection mechanism 6 includes a third support rod 61 installed on the top of the welding unit base plate 1. Every two third support rods 61 form a group. The top of each group of third support rods 61 is fixedly installed with a third X-axis module 62. The third X-axis module 62 drives the lead screw to rotate through a motor, thereby driving the thread sleeve to move in the X direction. The two third X-axis modules 62 are arranged in parallel, and a third Y-axis module 63 is installed on the surface of each thread sleeve of the two third X-axis modules 62. The third Y-axis module 63 drives the lead screw to rotate through a motor, thereby driving the thread sleeve to move in the Y direction. The thread sleeve of the third Y-axis module 63... A third vertical plate 64 is mounted on the surface of the welding unit base plate 1. A third Z-axis module 65 is mounted on the surface of the third vertical plate 64. The third Z-axis module 65 drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Z-axis. A third vertical slide rail 66 is also fixedly mounted on the surface of the third vertical plate 64. A third vertical slider 67 is slidably inserted into the surface of the third vertical slide rail 66. A third sliding plate 68 is fixedly mounted on the surface of the third vertical slider 67 and the surface of the lead sleeve of the third Z-axis module 65. A third industrial camera 69 is mounted on one end of the third sliding plate 68, and a material unloading robot 610 is mounted on the other end of the third sliding plate 68. A waste receiving box 611 is also fixedly mounted on the top of the welding unit base plate 1. The waste receiving box 611 is located at the bottom of the material unloading robot 610.

[0043] Specifically, this is achieved through the integrated design of a high-precision automated visual inspection and intelligent sorting system, enabling online, efficient, accurate, and automated judgment and processing of the welding quality of lithium battery injection hole caps. Its core advantages are: First, the third industrial camera 69, driven by a third X, Y, and Z axis module, can acquire multi-angle, high-resolution images of the cap weld. Combined with advanced image processing algorithms, the system can quickly and accurately identify various appearance defects in the weld, such as incomplete welding, over-welding, cracks, and porosity, achieving objectivity and data-driven quality judgment, completely replacing traditional manual visual inspection and avoiding quality misjudgments caused by human factors. Second, the unloading robot 610, seamlessly integrated with the inspection system, can automatically perform sorting actions based on real-time feedback from the inspection results. Qualified products are normally transferred to the next process; unqualified products are precisely picked up and placed into the waste receiving bin 611 below. This integrated closed-loop design of "detection-judgment-sorting" not only significantly improves production efficiency and detection cycle time, but also ensures that defective products can be isolated in a timely and thorough manner, effectively preventing unqualified products from flowing into subsequent stages and guaranteeing the overall quality and reliability of the final product.

[0044] The right end of the last welding unit base plate 1 is also provided with a turning and waiting mechanism 7. The turning and waiting mechanism 7 realizes the turning and waiting action of the square lithium battery 32 that has passed the appearance inspection mechanism 6. The turning and waiting mechanism 7 includes a material transfer base 71. A limit plate 72 is fixedly installed on one side of the top of the material transfer base 71. A universal conveying ball 73 is installed on the top of the material transfer base 71. Multiple universal conveying balls 73 are distributed in a rectangular array on the top of the material transfer base 71. A cylinder base plate 74 is also fixedly installed on the top of the other side of the material transfer base 71. A pusher telescopic cylinder 75 is fixedly installed on the surface of the cylinder base plate 74. A pusher plate 76 is fixedly installed on the telescopic end of the pusher telescopic cylinder 75. The surface of the pusher plate 76 is in contact with the surface of the conveying frame 31.

[0045] A waiting base 77 is provided on one side of the transfer base 71. A waiting base plate 78 is fixedly installed on the top of the waiting base 77. Both ends of the top of the waiting base plate 78 are rotatably connected to the waiting conveyor rollers 79 via bearings. The qualified square lithium battery 32 is placed in the conveyor frame 31 above the waiting conveyor rollers 79.

[0046] Specifically, this implementation utilizes a clever structural design to achieve smooth turning, buffered transition, and intelligent diversion of qualified lithium batteries, serving as a crucial hub connecting the testing process with the next production stage. Its core advantages are: First, the array of omnidirectional conveyor balls 73 on the transfer base 71 provides a low-friction, powerless turning platform for the conveyor frame 31. When the pusher cylinder 75 smoothly pushes the conveyor frame 31, the omnidirectional balls can flexibly rotate 360 ​​degrees, allowing the conveyor frame 31 and its internal batteries to easily and smoothly complete a 90-degree turn, avoiding the bumps, scratches, or positional shifts that may occur with traditional rigid turning, thus maximizing the protection of the battery surface integrity. Second, the waiting area after turning employs a waiting conveyor roller 79 design, which has a simple and reliable structure, effectively supporting the conveyor frame 31 and providing a stable docking platform for subsequent automated transfer or manual handling. This "flexible turning + smooth transition" design not only achieves seamless connection between processes, improving the automation level and continuity of the production line, but also significantly reduces the risk of defective products during the flow process by reducing physical contact points, ensuring a stable output of high-quality batteries.

[0047] This automatic laser sealing machine for lithium battery injection holes, through its modular and automated precision design, constructs a complete, efficient, stable, and intelligent production solution. Its core advantages are: First, the entire production line adopts a progressive, segmented welding strategy of "pre-welding - full welding - inspection," effectively controlling thermal stress and ensuring the stability and sealing of welding quality. Second, the conveying system integrates three major functions: stable support, dynamic correction, and flexible limiting, providing a solid foundation for high-precision operations. Simultaneously, the use of universal balls and conveyor rollers achieves smooth turning and transition, maximizing product protection. Third, the three core units—pre-welding, sealing, and inspection—all employ high-precision three-axis modules and industrial vision systems, achieving full automation and data-driven processes from positioning and welding to quality inspection, completely eliminating manual intervention and significantly improving production efficiency and product consistency. Finally, through the intelligent linkage between the 610 unloading robot and the waste bin, automatic product sorting and immediate isolation of defective products are achieved, forming a complete closed-loop quality control system. This equipment not only significantly improves production capacity and yield, but also represents the technological advancement in the lithium battery manufacturing field with its high degree of integration and intelligence.

[0048] Working principle: First stage: feeding and pre-welding; Feeding start: The operator places the conveyor frame 31 containing multiple square lithium batteries 32 on the waiting base 77 at the beginning of the production line.

[0049] When the conveyor frame 31 reaches the pre-welding station, the extrusion limiting blocks 315 on both sides extend under the drive of the cylinder and contact the conveyor frame 31 via the rollers 316 for flexible lateral positioning, ensuring the precise position of the battery matrix. The pre-welding mechanism 4 is then activated. Its first industrial camera 49 first takes a picture of the liquid injection hole cap for positioning. Subsequently, the first ultraviolet laser welding head 411, precisely driven by the three-axis module X / Y / Z, quickly completes three-point pre-welding on the cap according to the position identified by the camera. The main function of this step is to initially fix the cap, providing a stable reference for subsequent full welding and preventing the cap from shifting during the welding process.

[0050] Phase Two: Full Welding and Sealing; The conveyor wheel 37 rotates, driving the conveyor frame 31 and its internal battery matrix along a preset track, smoothly flowing to the next station—the full welding station. Visual Scanning and Path Planning: The sealing mechanism 5 is activated. Its second industrial camera 59 scans and identifies the pre-weld points on the cover and plans a complete circular welding path. Precision Full Welding: The second ultraviolet laser welding head 511 performs continuous and uniform full welding along the planned path. This progressive welding method, by controlling the laser energy input, allows heat to accumulate gradually, effectively avoiding the risk of a sudden surge in internal battery pressure due to high temperature, ensuring the sealing and strength of the weld. Simultaneously, the second exhaust pipe 510 removes welding fumes in real time, maintaining a clean working environment.

[0051] Phase 3: Appearance Inspection and Sorting, Transfer to Inspection Station: The fully welded conveyor frame 31 is transported to the final station—the appearance inspection station. High-precision visual inspection: The third industrial camera 69 of the appearance inspection mechanism 6, driven by a three-axis module, takes high-resolution, multi-angle photos of the sealing weld of each battery. Intelligent judgment and sorting: The equipment's built-in image processing algorithm analyzes the photos and automatically judges whether there are appearance defects such as incomplete welding, over-welding, cracks, and pores in the weld. Qualified: Qualified batteries continue to move forward on their conveyor frame 31. Unqualified: When a defect is detected, the equipment sends a signal. When the conveyor frame 31 moves to the unloading port, the unloading robot 610 accurately grabs the unqualified battery and puts it into the waste receiving box 611 below, achieving automatic rejection.

[0052] Steering and Buffering: Upon reaching the end of the production line, the qualified conveyor frame 31 is smoothly pushed onto the array of universal conveyor balls 73 on the transfer base 71 by the pusher plate 76. The universal balls allow the conveyor frame 31 to easily complete a 90-degree turn and smoothly transition onto the waiting conveyor roller 79, preparing it for the next process such as liquid injection.

[0053] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A laser automatic sealing machine for lithium battery injection holes, comprising a welding unit base plate (1), characterized in that: The three welding unit base plates (1) are arranged in a linear parallel arrangement, and the bottom of the welding unit base plate (1) is also equipped with casters (2). The top center of the three welding unit base plates (1) is provided with a conveying mechanism (3). The three conveying mechanisms (3) are connected end to end. The conveying mechanism (3) includes a conveying frame (31). The conveying frame (31) contains a square lithium battery (32). Multiple square lithium batteries (32) are arranged in a rectangular array inside the conveying frame (31). The conveying frame (31) performs conveying operations above the conveying mechanism (3). A pre-welding mechanism (4) is also provided on the top of the base plate (1) of the welding unit. The pre-welding mechanism (4) realizes the action of pre-welding three points of the liquid injection hole cap of the square lithium battery (32). A sealing welding mechanism (5) is also provided on the top of the bottom plate (1) of the middle welding unit. The sealing welding mechanism (5) realizes the action of fully welding the liquid injection hole of the square lithium battery (32). The top of the last welding unit base plate (1) is also provided with an appearance inspection mechanism (6), which performs the appearance inspection action after the liquid injection hole cap of the square lithium battery (32) is welded. The right end of the last welding unit base plate (1) is also provided with a turning and waiting mechanism (7), which realizes the turning and waiting action of the square lithium battery (32) that has passed the inspection by the appearance inspection mechanism (6).

2. The automatic laser sealing machine for lithium battery injection holes according to claim 1, characterized in that: The conveying mechanism (3) further includes a conveying base (33) installed at the top center of the welding unit base plate (1). Vertical poles (34) are fixedly installed around the top of the conveying base (33). A conveying crossbar (35) is fixedly installed on the top of every two vertical poles (34). The two conveying crossbars (35) are arranged in parallel. A transfer conveying groove (36) is opened on the top surface of the conveying crossbar (35). A conveying wheel (37) is rotatably connected to the inner wall of the transfer conveying groove (36). Multiple conveying wheels (37) are linearly arranged on the surface of the conveying crossbar (35). The bottom of the conveying frame (31) is slidably inserted into the surface of the conveying wheel (37). The top periphery of the conveying base (33) is also fixedly installed with first telescopic rods (38), and the top center of the conveying base (33) is fixedly installed with a first telescopic cylinder (39). The telescopic top end of the first telescopic cylinder (39) is fixedly installed with a support plate (310). The support plate (310) is located at the bottom of the conveying frame (31), and the telescopic top ends of the four first telescopic rods (38) are all fixedly installed with the bottom of the support plate (310). A connecting base plate (311) is fixedly installed at the bottom left end of each of the two conveying crossbars (35). A limit telescopic cylinder (312) is fixedly installed at the top center of the connecting base plate (311). A connecting column (313) is also fixedly installed at the top of the connecting base plate (311). A hinge seat (314) is fixedly installed at the top of the connecting column (313). A compression limiting block (315) is rotatably connected to the inner wall of one end of the hinge seat (314) via a pin. The telescopic top end of the limit telescopic cylinder (312) extends through and to the top of the hinge seat (314) and contacts the bottom side of the compression limiting block (315). A roller (316) is rotatably connected to the other end surface of the compression limiting block (315) via a pin. The surface of the roller (316) contacts the surface of the conveying frame (31).

3. The automatic laser sealing machine for lithium battery injection holes according to claim 1, characterized in that: The pre-welding mechanism (4) includes a first support rod (41) installed on the top of the welding unit base plate (1). Every two first support rods (41) form a group. A first X-axis module (42) is fixedly installed on the top of each group of first support rods (41). The first X-axis module (42) drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the X direction. The two first X-axis modules (42) are arranged in parallel. A first Y-axis module (43) is installed on the two lead sleeve surfaces of the two first X-axis modules (42). The first Y-axis module (43) drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Y direction. A first vertical plate (44) is installed on the lead sleeve surface of the first Y-axis module (43). A first Z-axis module (45) is installed on the surface of the first vertical plate (44). The first Z-axis module (45) drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Z direction. A first vertical slide rail (46) is also fixedly installed on the surface of the first vertical plate (44). A first vertical slider (47) is slidably inserted into the surface of the first vertical slide rail (46). A first sliding plate (48) is fixedly installed on the surface of the first vertical slider (47) and the surface of the lead sleeve of the first Z-axis module (45). A first industrial camera (49) is installed at one end of the first sliding plate (48). A first exhaust pipe (410) and a first ultraviolet laser welding head (411) are respectively installed at the other end of the first sliding plate (48). The top of the welding unit base plate (1) is also fixedly installed with an installation base (412). The two installation bases (412) are arranged symmetrically. The top of the installation base (412) is fixedly installed with a second telescopic rod (413) and a second telescopic cylinder (414). The second telescopic cylinder (414) is located between the two second telescopic rods (413). The telescopic top ends of the two second telescopic cylinders (414) are fixedly installed with a positioning welding plate (415). The positioning welding plate (415) is located on the top of the conveying frame (31), and the holes on the surface of the positioning welding plate (415) are movably connected to the surface of the square lithium battery (32) pole placed inside the conveying frame (31). The telescopic top ends of the multiple second telescopic rods (413) are fixedly installed with the bottom end of the positioning welding plate (415).

4. The automatic laser sealing machine for lithium battery injection holes according to claim 1, characterized in that: The sealing and welding mechanism (5) includes a second support rod (51) installed on the top of the welding unit base plate (1). Every two second support rods (51) form a group. A second X-axis module (52) is fixedly installed on the top of each group of second support rods (51). The second X-axis module (52) drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the X direction. The two second X-axis modules (52) are arranged in parallel. A second Y-axis module (53) is installed on the two lead sleeve surfaces of the two second X-axis modules (52). The second Y-axis module (53) drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Y direction. A second vertical plate (54) is installed on the lead sleeve surface of the second Y-axis module (53). The surface of the second vertical plate (54) is equipped with a second Z-axis module (55). The second Z-axis module (55) drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Z-axis. The surface of the second vertical plate (54) is also fixedly equipped with a second vertical slide rail (56). The surface of the second vertical slide rail (56) is slidably connected with a second vertical slider (57). The surface of the second vertical slider (57) and the surface of the lead sleeve of the second Z-axis module (55) are both fixedly equipped with a second sliding plate (58). One end of the second sliding plate (58) is equipped with a second industrial camera (59). The other end of the second sliding plate (58) is equipped with a second exhaust pipe (510) and a second ultraviolet laser welding head (511).

5. The automatic laser sealing machine for lithium battery injection holes according to claim 1, characterized in that: The appearance inspection mechanism (6) includes a third support rod (61) installed on the top of the welding unit base plate (1). Every two third support rods (61) form a group. A third X-axis module (62) is fixedly installed on the top of each group of third support rods (61). The third X-axis module (62) drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the X direction. The two third X-axis modules (62) are arranged in parallel, and a third Y-axis module (63) is installed on the two lead sleeve surfaces of the two third X-axis modules (62). The third Y-axis module (63) drives the lead screw to rotate via a motor, thereby driving the lead sleeve to move in the Y direction. A third vertical plate (64) is installed on the lead sleeve surface of the third Y-axis module (63), and a third Z-axis module (63) is installed on the surface of the third vertical plate (64). The third Z-axis module (65) is driven by a motor to rotate the lead screw and thus drive the lead sleeve to move in the Z-axis. The surface of the third vertical plate (64) is also fixedly mounted with a third vertical slide rail (66). The surface of the third vertical slide rail (66) is slidably inserted with a third vertical slider (67). The surface of the third vertical slider (67) and the surface of the lead sleeve of the third Z-axis module (65) are both fixedly mounted with a third sliding plate (68). One end of the third sliding plate (68) is mounted with a third industrial camera (69). The other end of the third sliding plate (68) is mounted with a material unloading robot (610). The top of the welding unit base plate (1) is also fixedly mounted with a waste receiving box (611). The waste receiving box (611) is located at the bottom of the material unloading robot (610).

6. The automatic laser sealing machine for lithium battery injection holes according to claim 1, characterized in that: The turning and waiting mechanism (7) includes a material transfer base (71). A limit plate (72) is fixedly installed on one side of the top of the material transfer base (71). A universal conveying ball (73) is installed on the top of the material transfer base (71). Multiple universal conveying balls (73) are arranged in a rectangular array on the top of the material transfer base (71). A cylinder base plate (74) is also fixedly installed on the top of the other side of the material transfer base (71). A pusher telescopic cylinder (75) is fixedly installed on the surface of the cylinder base plate (74). A pusher plate (76) is fixedly installed on the telescopic end of the pusher telescopic cylinder (75). The surface of the pusher plate (76) is in contact with the surface of the conveying frame (31).

7. The automatic laser sealing machine for lithium battery injection holes according to claim 6, characterized in that: A waiting base (77) is provided on one side of the transfer base (71). A waiting base plate (78) is fixedly installed on the top of the waiting base (77). Both ends of the top of the waiting base plate (78) are rotatably connected to the waiting conveyor rollers (79) through bearings. The qualified square lithium battery (32) placement conveyor frame (31) is located above the waiting conveyor rollers (79).

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