Lithium battery tab laser welding machine

Abstract

The utility model provides a lithium battery tab laser welding machine. The lithium battery tab laser welding machine comprises a workbench, a movable mechanical arm, a welding vibration lens, a laser welding main machine, an optical fiber, a cold air knife assembly and a cold air device. The workbench is used for bearing a lithium battery workpiece to be welded; the movable mechanical arm is movably mounted on the workbench; the welding vibration lens is mounted on the movable mechanical arm and is driven by the movable mechanical arm to move to a welding part of a lithium battery tab; the laser welding host is used for generating a laser beam, is connected to the welding vibration lens through an optical fiber and transmits the laser beam to the welding vibration lens; the welding vibration lens focuses the laser beams and welds the tabs; the cold air knife assembly is installed on one side of the welding vibration lens and used for blowing and cooling a welding area after welding is completed. And the cold air device is arranged in the laser welding host box body. According to the lithium battery tab laser welding machine, the cooling efficiency of a welded workpiece is improved, the heat affected area is reduced, and the welding quality and performance of a lithium battery are improved.

Description

Technical Field

[0001] This utility model relates to the field of electrode welding technology, specifically to a lithium battery electrode laser welding machine. Background Technology

[0002] In the production process of lithium batteries, the welding quality of the tabs and electrodes plays a decisive role in the performance and safety of the batteries. With the development of laser technology, laser welding machines are increasingly being used for lithium battery tab welding. However, existing laser welding machines have shortcomings in cooling the welded workpiece. The high heat generated during welding can cause the heat-affected zone of the tabs and electrodes to expand, potentially leading to problems such as tab deformation and changes in the electrode matrix structure, thus affecting the performance of the lithium battery. Therefore, developing a laser welding machine for lithium battery tabs with good cooling performance is of significant practical importance. Utility Model Content

[0003] In view of the above, this utility model provides a lithium battery tab laser welding machine to improve the cooling efficiency of the welded workpiece, reduce the heat-affected zone, and improve the welding quality and performance of the lithium battery.

[0004] The technical solution of this utility model:

[0005] This utility model provides a lithium battery tab laser welding machine, including a worktable, a movable robotic arm, a welding galvanometer, a laser welding host, an optical fiber, a cold air knife assembly, and a cooling device. The worktable is used to support the lithium battery workpiece to be welded. The movable robotic arm is movably mounted on the worktable. The welding galvanometer is mounted on the movable robotic arm and is moved to the welding position of the lithium battery tab by the movable robotic arm. The laser welding host generates a laser beam and is connected to the welding galvanometer via an optical fiber to transmit the laser beam to the welding galvanometer. The welding galvanometer focuses the laser beam and performs welding on the tab. The cold air knife assembly is mounted on one side of the welding galvanometer and is used to cool the welding area after welding. The cooling device is installed inside the laser welding host housing and supplies cooling gas to the cold air knife assembly.

[0006] Furthermore, the cold air knife assembly includes a connecting seat, two parallel connecting rods, and an air knife; the connecting seat is installed on one side of the welding diaphragm head, the top ends of the two connecting rods are connected to the connecting seat, and the two ends of the air knife are sleeved on the two connecting rods.

[0007] Furthermore, the cold air knife assembly also includes an adjusting shaft and a nut; the adjusting shaft is fixed to the connecting seat, and the adjusting shaft is installed on one side of the welding diaphragm in an adjustable angle manner. The end of the adjusting shaft is threaded, and the nut is screwed onto the threaded section of the adjusting shaft.

[0008] Furthermore, multiple air blades are arranged in parallel vertically and connected in series on two connecting rods.

[0009] Furthermore, the cold air device consists of a gas compressor, a cooler, a filter, and a gas storage tank connected in sequence by pipes; the gas storage tank is connected to the cooling gas inlet of the cold air knife through a gas pipe.

[0010] Furthermore, the movable robotic arm includes a vertical shaft, a crossbeam, a parallelogram mechanism, and a hydraulic telescopic rod; the vertical shaft is vertically mounted on the worktable, one end of the crossbeam is rotatably connected to the vertical shaft, and the other end is rotatably connected to one end of the parallelogram mechanism, with a welding vibrating head installed at the other end of the parallelogram mechanism; one end of the hydraulic telescopic rod is hinged to the end of the parallelogram mechanism near the crossbeam, and the other end is hinged to the middle section of the parallelogram mechanism.

[0011] Furthermore, a pressure rod is installed on the parallelogram mechanism near the welding diaphragm head to press the electrode tab welding position.

[0012] Furthermore, the bottom end of the pressure bar is provided with a weld joint.

[0013] Furthermore, the laser welding machine is equipped with a display screen for showing the working status.

[0014] Furthermore, the laser welding machine is equipped with control buttons for controlling the working status.

[0015] This utility model of a lithium battery tab laser welding machine, through the reasonable arrangement of the cold air knife assembly and the cold air device, can produce the following beneficial effects:

[0016] I. Improve welding cooling efficiency to ensure battery performance

[0017] Instant and efficient cooling: This invention utilizes a cold air knife assembly installed on one side of the welding diaphragm head to blow cooling gas into the welding area instantly upon completion of welding. Compared to traditional post-weld natural cooling, this significantly reduces the time required for the welding area to cool down. Rapid cooling effectively suppresses the impact of high temperatures generated during welding on the tabs and electrodes, reduces the expansion of the heat-affected zone, and lowers the risks of tab deformation and alterations in the electrode matrix, thereby ensuring the performance and safety of the lithium battery.

[0018] II. Improve welding operation flexibility and adapt to diverse scenarios

[0019] Flexible welding positioning: The movable robotic arm is mounted on the worktable, and the welding gaiter is mounted on the movable robotic arm. This design allows the welding gaiter to move precisely in multiple dimensions, enabling omnidirectional and multi-angle welding operations. Whether it's a standard-shaped lithium battery tab or a special lithium battery with a complex structure, the welding area can be precisely positioned, greatly improving the equipment's applicability.

[0020] Compact structural design: The cooling air unit is installed inside the laser welding main unit housing, reducing the space occupied by external equipment and making the entire welding machine more compact. This not only facilitates equipment installation and commissioning but also improves the rationality of equipment layout within limited production space, adapting to production workshops of different sizes.

[0021] III. Ensure welding quality and improve production efficiency

[0022] Precise welding control: The laser welding host precisely controls the generation of the laser beam, and the welding galvanometer focuses the laser beam and welds the electrode tabs according to a preset trajectory. Combined with the precise movement of the robotic arm, high-precision welding operations are achieved, ensuring the quality and consistency of the weld joints. Simultaneously, immediate cooling measures reduce welding defects caused by thermal deformation, further improving weld quality.

[0023] Efficient production process: Rapid cooling allows lithium batteries to complete welding and cooling processes in a short time, shortening the production cycle of a single battery. Combined with the equipment's flexible operation, continuous and efficient production is achieved, improving overall production efficiency.

[0024] The preferred embodiments of this utility model and their beneficial effects will be further described in detail in conjunction with specific implementation methods. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but should not be construed as limiting the present invention. In the drawings:

[0026] Figure 1 This is a perspective view of the lithium battery tab laser welding machine of this utility model;

[0027] Figure 2 This is a front view of the lithium battery tab laser welding machine of this utility model;

[0028] Figure 3 This is a partial enlarged view of the lithium battery tab laser welding machine of this utility model.

[0029] The following are the reference numerals: 1. Workbench; 2. Movable robotic arm; 3. Welding diaphragm head; 4. Laser welding host; 5. Fiber optic cable; 6. Cold air knife assembly; 61. Connecting seat; 62. Linkage rod; 63. Air knife; 64. Adjusting shaft; 65. Nut; 66. Air pipe; 21. Vertical shaft; 22. Crossbeam; 23. Parallelogram mechanism; 24. Hydraulic telescopic rod; 25. Pressure rod; 41. Display screen; 42. Control button. Detailed Implementation

[0030] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0031] Please see Figures 1 to 3 This utility model provides a lithium battery tab laser welding machine, including a worktable 1, a movable robotic arm 2, a welding diaphragm head 3, a laser welding host 4, an optical fiber 5, a cold air knife assembly 6, and a cooling device. The worktable 1 is used to support the lithium battery workpiece to be welded. The movable robotic arm 2 is movably mounted on the worktable 1. The welding diaphragm head 3 is mounted on the movable robotic arm 2 so that the movable robotic arm 2 can drive the welding diaphragm head 3 to move to the welding position of the lithium battery tab. The laser welding host 4 is used to generate a laser beam and is connected to the welding diaphragm head 3 through the optical fiber 5 to transmit the laser beam to the welding diaphragm head 3. The welding diaphragm head 3 is used to focus the laser beam and weld the tab. The cold air knife assembly 6 is mounted on one side of the welding diaphragm head 3 and is used to blow air to cool the welding area after welding. The cooling device is installed inside the laser welding host 4 and is used to provide cooling gas to the cold air knife assembly 6.

[0032] This utility model of a lithium battery tab laser welding machine, through the reasonable arrangement of the cold air knife assembly 6 and the cold air device, can produce the following beneficial effects:

[0033] I. Improve welding cooling efficiency to ensure battery performance

[0034] Instant and efficient cooling: This invention utilizes a cold air knife assembly 6 installed on one side of the welding diaphragm head 3 to blow cooling gas into the welding area instantly upon completion of welding. Compared to traditional natural cooling after welding, this significantly reduces the time required for the welding area to cool down. Rapid cooling effectively suppresses the impact of high temperatures generated during welding on the tabs and electrodes, reduces the expansion of the heat-affected zone, and lowers the risks of tab deformation and alteration of the electrode substrate structure, thereby ensuring the performance and safety of the lithium battery.

[0035] II. Improve welding operation flexibility and adapt to diverse scenarios

[0036] Flexible welding positioning: The movable robotic arm 2 is movably mounted on the worktable 1, and the welding gaiter 3 is mounted on the movable robotic arm 2. This design allows the welding gaiter 3 to move precisely in multiple dimensions, enabling omnidirectional and multi-angle welding operations. Whether it is a conventionally shaped lithium battery tab or a special lithium battery with a complex structure, the welding area can be accurately positioned, greatly improving the applicability of the equipment.

[0037] Compact structural design: The cooling air unit is installed inside the laser welding main unit's four-box enclosure, reducing the space occupied by external equipment and making the entire welding machine more compact. This not only facilitates equipment installation and commissioning but also improves the rationality of equipment layout within limited production space, adapting to production workshops of different sizes.

[0038] III. Ensure welding quality and improve production efficiency

[0039] Precise welding control: The laser welding host 4 precisely controls the generation of the laser beam, and the welding gaiter 3 focuses the laser beam and welds the electrode tabs according to a preset trajectory. Combined with the precise movement of the robotic arm 2, high-precision welding operations are achieved, ensuring the quality and consistency of the weld joints. Simultaneously, immediate cooling measures reduce welding defects caused by thermal deformation, further improving welding quality.

[0040] Efficient production process: Rapid cooling allows lithium batteries to complete welding and cooling processes in a short time, shortening the production cycle of a single battery. Combined with the equipment's flexible operation, continuous and efficient production is achieved, improving overall production efficiency.

[0041] In this embodiment, the cold air knife assembly 6 includes a connecting seat 61, connecting rods 62, and an air knife 63. The connecting seat 61 is installed on one side of the welding diaphragm head 3, and the top ends of two parallel connecting rods 62 are connected to the connecting seat 61. The two ends of the air knife 63 are sleeved on the two connecting rods 62. Thanks to the connecting seat 61 mounting the air knife 63 on one side of the welding diaphragm head 3, the air outlet of the air knife 63 can be aligned closely with the welding area at the moment welding is completed. The parallel connecting rod design makes the position of the air knife 63 more stable, which can accurately deliver the high-speed cooling airflow to the welding point, quickly remove heat, and reduce the heat-affected zone. This effectively prevents the tab from deforming due to overheating and changes in the electrode structure, significantly reduces the welding defect rate, and improves the welding quality and performance of lithium batteries.

[0042] In this embodiment, the cold air knife assembly 6 includes an adjusting shaft 64 and a nut 65. The adjusting shaft 64 is fixed to the connecting seat 61 and is angularly mounted on one side of the welding diaphragm head 3. Optionally, the adjusting shaft 64 has a threaded end, and the nut 65 is screwed onto the threaded section of the adjusting shaft 64. The adjustable shaft 64 is angularly mounted on one side of the welding diaphragm head 3. By rotating the adjusting shaft, the operator can easily change the orientation of the air knife assembly, allowing the air knife outlet to be precisely aligned with different positions in the welding area. When the nut 65 is screwed onto the threaded section of the adjusting shaft 64, tightening the nut fixes the adjusting shaft at a specific angle, ensuring that the cooling airflow acts on the welding point at the optimal angle. This greatly improves cooling efficiency, quickly removes the heat generated during welding, effectively reduces the heat-affected zone, prevents overheating and deformation of the electrode tabs, reduces the probability of welding defects such as incomplete soldering and desoldering, and significantly improves the welding quality and performance of lithium batteries.

[0043] In this embodiment, multiple air blades 63 are arranged in parallel vertically, and the multiple air blades 63 are connected in series on two connecting rods 62.

[0044] In this embodiment, the cooling air device includes a gas compressor, a cooler, a filter, and a gas storage tank connected in sequence via pipelines. Compressed gas output from the gas compressor is transported to the cooler via pipelines. After being cooled by the cooler, the gas flows into the filter via pipelines, and the filtered gas finally enters the gas storage tank for storage. The gas storage tank is connected to the cooling gas inlet of the cooling air knife via a gas pipe 66, providing a stable supply of cooling gas for the cooling air knife.

[0045] In this embodiment, the movable robotic arm 2 includes a vertical shaft 21, a crossbeam 22, a parallelogram mechanism 23, and a hydraulic telescopic rod 24. The vertical shaft 21 is vertically mounted on the worktable 1. One end of the crossbeam 22 is rotatably connected to the vertical shaft 21, and the other end is rotatably connected to one end of the parallelogram mechanism 23. The welding diaphragm head 3 is mounted on the other end of the parallelogram mechanism 23. One end of the hydraulic telescopic rod 24 is hinged to the end of the parallelogram mechanism 23 near the crossbeam 22, and the other end is hinged to the middle section of the parallelogram mechanism 23 to keep the welding diaphragm head 3 raised above the worktable 1. With the coordinated operation of the vertical shaft 21, the crossbeam 22, and the parallelogram mechanism 23, the welding diaphragm head 3 can achieve flexible multi-dimensional movement. During lithium battery tab welding, it can accurately position any welding point, breaking through the movement limitations of traditional robotic arms and meeting the requirements of complex welding trajectories. The parallelogram mechanism 23 ensures that the welding diaphragm head 3 maintains a stable posture during movement, avoiding welding deviations caused by the swing of the robotic arm, significantly improving welding accuracy and consistency, reducing the defect rate, and ensuring the welding quality of lithium battery tabs. The hydraulic telescopic rod 24 provides stable support for the parallelogram mechanism 23, ensuring that the welding diaphragm head 3 remains stable when raised. This greatly enhances the structural stability of the movable robotic arm 2, enabling it to maintain reliable operation during high-speed movement or long-term continuous work. This not only reduces equipment failure rate and extends equipment lifespan but also lays a solid foundation for efficient and stable welding operations. By controlling the extension and retraction of the hydraulic telescopic rod 24, operators can easily adjust the height and angle of the welding diaphragm head 3. This simplifies the equipment operation process and improves operational convenience. Whether welding lithium batteries of different specifications or requiring complex welding processes, operators can quickly adjust the position and posture of the welding diaphragm head 3, significantly improving production efficiency and reducing labor costs.

[0046] In this embodiment, a pressure rod 25 for pressing the electrode tab welding position is installed on the parallelogram mechanism 23 near the welding head 3. The bottom end of the pressure rod 25 has a welding port.

[0047] In this embodiment, the laser welding host 4 is equipped with a display screen 41 for displaying the working status and multiple control buttons 42 for controlling the working status.

[0048] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying importance; the words "bottom surface" and "top surface," "inner" and "outer" respectively refer to the geometric direction toward or away from a specific component.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A laser welding machine for lithium battery tabs, characterized in that, The system includes a worktable (1), a movable robotic arm (2), a welding diaphragm head (3), a laser welding host (4), an optical fiber (5), a cold air knife assembly (6), and a cold air device. The worktable (1) is used to support the lithium battery workpiece to be welded. The movable robotic arm (2) is movably mounted on the worktable (1). The welding diaphragm head (3) is mounted on the movable robotic arm (2) and moves to the welding position of the lithium battery tab with the help of the movable robotic arm (2). The laser welding host (4) is used to generate a laser beam and is connected to the welding diaphragm head (3) through the optical fiber (5) to transmit the laser beam to the welding diaphragm head (3). The welding diaphragm head (3) focuses the laser beam and performs welding on the tab. The cold air knife assembly (6) is mounted on one side of the welding diaphragm head (3) and is used to blow air to cool the welding area after welding. The cold air device is installed inside the laser welding host (4) housing and supplies cooling gas to the cold air knife assembly (6).

2. The lithium battery tab laser welding machine according to claim 1, characterized in that, The cold air knife assembly (6) includes a connecting seat (61), two parallel connecting rods (62) and an air knife (63); the connecting seat (61) is installed on one side of the welding diaphragm head (3), the top ends of the two connecting rods (62) are connected to the connecting seat (61), and the two ends of the air knife (63) are sleeved on the two connecting rods (62).

3. The lithium battery tab laser welding machine according to claim 2, characterized in that, The cold air knife assembly (6) also includes an adjusting shaft (64) and a nut (65); the adjusting shaft (64) is fixed to the connecting seat (61), the adjusting shaft (64) is installed on one side of the welding diaphragm (3) in an adjustable angle manner, the end of the adjusting shaft (64) is threaded, and the nut (65) is screwed onto the threaded section of the adjusting shaft (64).

4. The lithium battery tab laser welding machine according to claim 2 or 3, characterized in that, Multiple air blades (63) are arranged in parallel vertically and connected in series on two connecting rods (62).

5. The lithium battery tab laser welding machine according to claim 1, characterized in that, The cold air device consists of a gas compressor, a cooler, a filter, and a gas storage tank connected in sequence by pipes; the gas storage tank is connected to the cooling gas inlet of the cold air knife through a gas pipe (66).

6. The lithium battery tab laser welding machine according to claim 1, characterized in that, The mobile robotic arm (2) includes a vertical shaft (21), a crossbeam (22), a parallelogram mechanism (23), and a hydraulic telescopic rod (24). The vertical shaft (21) is vertically mounted on the workbench (1). One end of the crossbeam (22) is rotatably connected to the vertical shaft (21), and the other end is rotatably connected to one end of the parallelogram mechanism (23). The other end of the parallelogram mechanism (23) is equipped with a welding vibrating head (3). One end of the hydraulic telescopic rod (24) is hinged to one end of the parallelogram mechanism (23) near the crossbeam (22), and the other end is hinged to the middle section of the parallelogram mechanism (23).

7. The lithium battery tab laser welding machine according to claim 6, characterized in that, A pressure rod (25) is installed on the parallelogram mechanism (23) near the welding diaphragm (3) to press the electrode tab welding position.

8. The lithium battery tab laser welding machine according to claim 7, characterized in that, The bottom end of the pressure bar (25) is provided with a weld joint.

9. The lithium battery tab laser welding machine according to claim 1, characterized in that, The laser welding host (4) is equipped with a display screen (41) for displaying the working status.

10. The lithium battery tab laser welding machine according to claim 1, characterized in that, The laser welding host (4) is equipped with control buttons (42) for controlling the working status.

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