An intelligent welding system integrated with real-time focal length compensation function

Abstract

The application provides an intelligent welding system integrated with a real-time focal length compensation function, and relates to the technical field of laser welding.The intelligent welding system comprises a laser, a laser scanning system, a control module and a clamping positioning mechanism.The laser scanning system is arranged opposite to the laser, is used for measuring the position offset of an electric core and a battery shell and adjusting the focal length of a laser beam in real time, the control module is connected with the laser scanning system, is used for calculating the focal point offset according to the position offset and sending the focal point offset to the laser scanning system, and the clamping positioning mechanism is connected with the electric core and the battery shell, makes the electric core and the battery shell closely adhere to each other, and conveys the electric core and the battery shell to a welding station.The position offset obtained by the laser scanning system is fed back to the control module, the control module calculates the focal point offset according to the position offset and compensates, so that self-adaptive focusing is realized, the welding quality is improved under the premise of not affecting the production rhythm, and each welding is located at an ideal focal point position.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to an intelligent welding system integrating real-time focal length compensation. Background Technology

[0002] With the continuous development of laser technology, laser welding has become the mainstream welding process, possessing many advantages such as non-contact and high efficiency. It is widely used in industries such as automobiles, hardware, 3C electronics, and new energy batteries. In traditional laser processing, the laser focus is fixed at a certain position on the workpiece surface. During the processing, the focus remains stationary. Because the laser beam is conically focused, the energy density is highest at the focus. When it moves away from the focus, the energy density drops significantly, resulting in uneven heating of the material along the optical axis. At the same time, the focus may deviate. Due to the focus deviation, the laser energy may be insufficient, resulting in insufficient weld penetration (false weld) or uneven weld width, and in severe cases, it may cause the weld band to break.

[0003] To address this issue in existing technologies, displacement sensors are installed near the laser to monitor changes in the workpiece surface height. For example, Chinese patent CN 202211006646.1 discloses a laser welding focal length adjustment collimator that uses a distance sensor installed on one side of the welding gun to detect the distance between the workpieces and determine whether the focal point has deviated from the focal depth range, triggering an early warning. However, this device requires the distance sensor to detect the focal length before it can be adjusted, which results in a delay. Furthermore, due to its slow response speed, it cannot adapt to high-speed production. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects and problems of low adjustment efficiency in the prior art and to provide an intelligent welding system with integrated real-time focal length compensation function and high adjustment efficiency.

[0005] To achieve the above objectives, the technical solution of the present invention is: an intelligent welding system integrating real-time focal length compensation function, comprising:

[0006] A laser, used to emit a laser beam;

[0007] A laser scanning system, positioned opposite the laser, is used to measure the positional offset of the battery cell and the battery casing and adjust the focal length of the laser beam in real time so that the laser beam is focused on the processing surfaces of the battery cell and the battery casing in real time for welding.

[0008] The control module, connected to the laser scanning system, is used to obtain the position offset measured by the laser scanning system, calculate the focal offset, and send the focal offset to the laser scanning system to adjust the focal length of the laser beam in real time.

[0009] A clamping and positioning mechanism connects the battery cell to the battery casing and makes the battery cell and battery casing fit tightly together, and transports the battery cell and battery casing to the welding station.

[0010] The clamping and positioning mechanism includes:

[0011] Base;

[0012] The carrier is mounted on the base, and its end face is provided with a receiving cavity for receiving the battery cell and the battery casing;

[0013] A clamping mechanism, mounted on the base and positioned opposite to the carrier, is used to ensure that the battery cell is tightly fitted to the battery casing.

[0014] A drive mechanism is used to drive the clamping mechanism to move simultaneously along a first direction and a second direction to clamp the battery casing and the battery cell within the carrier.

[0015] The drive mechanism includes a lifting component and a power component;

[0016] The lifting assembly is slidably mounted on the base along the first direction, and the clamping mechanism is mounted on the base via the lifting assembly;

[0017] The clamping mechanism is slidably mounted on the lifting assembly along the second direction;

[0018] The power component is used to drive the lifting component to move so that the clamping component moves simultaneously in a first direction and a second direction.

[0019] The base is provided with guide limiting holes;

[0020] The clamping mechanism includes a mounting plate and a support roller. The mounting plate is slidably mounted on the lifting assembly along the second direction, and the support roller is fixedly mounted on the mounting plate.

[0021] The roller is rolled and installed in the guide limiting hole.

[0022] The lifting assembly includes a lifting plate and a first elastic element, one end of which is connected to the lifting plate and the other end of which is connected to the base.

[0023] The inner wall of the receiving cavity is formed with an installation groove;

[0024] The carrier includes a clamping assembly that is rotatably mounted in the mounting slot to elastically clamp the battery housing.

[0025] The clamping assembly includes a contour positioning block, a rotating shaft, and a second elastic element;

[0026] The rotating shaft is installed in the mounting groove, and the contour positioning block is rotatably installed in the mounting groove via the rotating shaft;

[0027] The two opposite ends of the second elastic element are respectively connected to the contour positioning block and the mounting groove;

[0028] When the battery casing is loaded into the carrier, the contour positioning block is forced to fit against the outer wall of the battery casing.

[0029] The laser scanning system includes a focal scanning unit and a D-mirror unit;

[0030] The focal scanning unit is positioned opposite to the laser and is used to emit a measurement beam that is collinear with the laser beam. The measurement beam is used to directly measure the positional offset between the battery cell and the battery casing.

[0031] The 3D galvanometer unit, connected to the control module, is used to adjust the focal length of the laser beam in real time by changing the reflection direction of the laser beam according to the focal offset sent by the control module, so that the laser beam is focused on the processing surface of the cell and the battery casing for welding in real time.

[0032] The 3D galvanometer unit includes:

[0033] A galvanometer, positioned opposite the path of the laser beam, is used to reflect the laser beam;

[0034] A field mirror, arranged opposite to the reflection direction of the galvanometer, is used to project the laser beam reflected by the galvanometer onto the processed surfaces of the cell and battery casing.

[0035] A galvanometer motor, connected to the galvanometer, is used to control the rotation of the galvanometer to change the reflection direction of the laser beam and adjust the focal length of the laser beam in real time.

[0036] A drive controller, connected to the control module and the galvanometer motor, is used to control the galvanometer motor to rotate by a corresponding angle according to the focal offset sent by the control module.

[0037] The galvanometer includes:

[0038] The X-axis reflector and Y-axis reflector are connected to the galvanometer motor and are used to work together to change the planar position of the laser beam so that the laser beam can perform trajectory scanning in the plane.

[0039] A Z-axis reflector, connected to the galvanometer motor, is used to adjust the focal length of the laser beam in real time so that the laser beam is ultimately focused on the processed surfaces of the cell and battery casing.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] This invention discloses an intelligent welding system integrating real-time focus compensation. The positional offset obtained by a laser scanning system is fed back to the control module. The control module calculates the focus offset based on the positional offset and performs compensation, thus achieving adaptive focusing. This ensures that each weld is positioned at the ideal focus location with micron-level detection accuracy without affecting production cycle time, thereby improving weld quality. A clamping and positioning mechanism is used to position the battery cell and casing, further improving positioning accuracy and ensuring relatively stable subsequent welding quality. Therefore, this invention offers a high adjustment rate. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of an intelligent welding system integrating real-time focal length compensation function according to the present invention.

[0043] Figure 2 This is a schematic diagram of the clamping and positioning mechanism in this invention.

[0044] Figure 3 This is a schematic diagram of the clamping and positioning mechanism in this invention when it is clamping.

[0045] Figure 4 This is a schematic diagram of the clamping and positioning mechanism in this invention when it is not clamped.

[0046] Figure 5 This is a cross-sectional schematic diagram of the clamping mechanism and the driving mechanism in this invention.

[0047] Figure 6 This is a schematic diagram of the structure of the base, the clamping assembly, the first movable part, and the second movable part in this invention.

[0048] Figure 7 This is a schematic diagram of the clamping component in this invention.

[0049] Figure 8 This is a cross-sectional schematic diagram of the clamping component in this invention.

[0050] Figure 9 This is a schematic diagram of the structure of the first movable component and the second movable component in this invention.

[0051] Figure 10 This is a schematic diagram of the structure of the laser and laser scanning system in this invention.

[0052] Figure 11 This is a schematic diagram of the structure of the 3D galvanometer unit in this invention.

[0053] In the picture:

[0054] 1. Laser;

[0055] 2. Laser scanning system; 21. Focal scanning unit; 211. Measurement light source; 212. Reflector; 213. Beam combiner; 22. 3D galvanometer unit; 221. Galvanometer; 2211. X-axis reflector; 2212. Y-axis reflector; 2213. Z-axis reflector; 222. Field lens; 223. Galvanometer motor; 224. Drive controller; 23. Collimating lens;

[0056] 3. Clamping and positioning mechanism; 31. Base; 311. Guide limiting hole; 32. Carrier; 321. Receiving cavity; 322. Mounting groove; 323. Clamping assembly; 3231. Contouring positioning block; 3232. Rotating shaft; 3233. Second elastic element; 3234. Welding pressure head; 3235. Spring stop plate; 3236. Contouring stop block; 324. Buffer plate; 325. Positioning seat; 326. Support plate; 327. Reinforcing rib; 328. Base plate; 33. Clamping Mechanism; 331, Mounting plate; 332, Support roller; 333, Push head; 334, Support block; 335, Guide shaft; 336, Third elastic element; 34, Drive mechanism; 341, Lifting assembly; 3411, Lifting plate; 3412, First elastic element; 3413, Support column; 3414, Cam follower; 35, First moving part; 351, First slide rail; 352, First slider; 36, Second moving part; 361, Second slide rail; 362, Second slider;

[0057] 4. Battery casing;

[0058] 5. Battery cells;

[0059] 6. Position sensor sheet;

[0060] 7. Control module;

[0061] 8. Collector plate. Detailed Implementation

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] The following is combined Figures 1 to 11 This invention describes an intelligent welding system that integrates real-time focal length compensation.

[0064] like Figure 1 As shown, this embodiment provides an intelligent welding system with integrated real-time focal length compensation function, including:

[0065] Laser 1 is used to emit a laser beam;

[0066] The laser scanning system 2, positioned opposite the laser 1, is used to measure the positional offset of the battery cell 5 and the battery casing 4 and to adjust the focal length of the laser beam in real time so that the laser beam is focused on the processing surfaces of the battery cell 5 and the battery casing 4 for welding. The laser scanning system 2 can use an independent measurement light source to measure the distance between the laser head and the battery cell 5 and the battery casing 4 through spectral confocal technology. It adopts a coaxial design concept, with the measurement beam collinear with the laser beam, and can directly measure the axial positional offset of the battery cell 5 and the battery casing 4, while ensuring that the measurement position is consistent with the laser processing position, thereby accurately reflecting the focal offset and avoiding laser processing failure caused by it.

[0067] The control module 7 is connected to the laser scanning system 2 and is used to obtain the position offset measured by the laser scanning system 2, calculate the focal offset, and send the focal offset to the laser scanning system 2 to adjust the focal length of the laser beam in real time.

[0068] The clamping and positioning mechanism 3 connects to the battery cell 5 and the battery housing 4 and makes the battery cell 5 and the battery housing 4 fit tightly together, and then transports the battery cell 5 and the battery housing 4 to the welding station.

[0069] It is understood that this embodiment can be used to weld the current collector 8. Before the battery cell 5 and battery casing 4 are loaded, the current collector 8 is placed in the clamping and positioning mechanism 3, and then the battery cell 5 and battery casing 4 are pressed together so that the negative electrode of the battery cell 5 is in contact with the current collector 8. During welding, the current collector 8 is welded to the battery cell 5 and battery casing 4 by emitting a laser through the laser 1 to form an integral whole.

[0070] like Figures 2 to 4 As shown, the clamping and positioning mechanism 3 in this embodiment includes:

[0071] Base 31; carrier 32, installed on one side of base 31, multiple positioning seats 325 can be placed on the other side of base 31, the end face of which is provided with a receiving cavity 321 for receiving battery cell 5 and current collector, the positioning seats 325 can be placed side by side to facilitate the batch placement of battery housing 4 and battery cell 5, the upper end of the receiving cavity 321 should be connected to the positioning seat 325, and the battery housing 4 and battery cell 5 can be placed into the receiving cavity 321 in sequence;

[0072] The clamping mechanism 33 is installed on the base 31 and is positioned opposite to the multiple positioning seats 325 on the carrier 32. It is used to make the battery cell 5, the battery housing 4 and the current collector 8 fit tightly together. The clamping mechanism 33 can be set at the positive end of the battery cell 5. When clamping, the negative end of the battery cell 5 is pressed against the preset welding position of the battery housing 4 and welded to the current collector 8.

[0073] The driving mechanism 34 is used to drive the clamping mechanism 33 to move simultaneously along the first direction and the second direction to clamp the battery casing 4 and the battery cell 5 inside the carrier 32. The first direction and the second direction intersect. When the clamping mechanism 33 moves in opposite directions along the first direction and the second direction, it can separate from the battery casing 4 and the battery cell 5 inside the carrier 32.

[0074] It should be noted that in this embodiment, the receiving cavity 321 is cylindrical with a wider upper diameter and a narrower lower diameter to facilitate the placement of the battery cell 5 and the battery casing 4. The lower side of the receiving cavity 11 should be connected to the positioning seat 1 to facilitate the placement of the current collector 9. A contour block 3236 can be provided on the upper end face of the positioning seat 325. The shape of the contour block 3236 matches the shape of the battery casing 4 so that the battery casing 4 can play a guiding and lateral limiting role when it is placed into the positioning seat 325.

[0075] Understandably, since multiple positioning seats 325 are arranged side by side, the current collector 8 can be placed into the receiving cavity 321 in batches first, and then the battery housing 4 and the battery cell 5 can be placed into the receiving cavity 321. Before entering the receiving cavity 321, the battery housing 4 will first contact the contour block 3236. Under the limitation of the contour block 3236, the battery housing 4 enters the receiving cavity 321. Finally, the terminal end of the battery cell 5 contacts the upper surface of the current collector 8. At this time, the clamping mechanism 33 can clamp the multiple battery cells 5. After clamping, the carrier 32 is transported to the welding station for welding of the battery cell 5 and the current collector 8.

[0076] Furthermore, in order to optimize the overall structure of the clamping and positioning mechanism 3, in this embodiment, the carrier 32 can be connected to the conveying mechanism at the same time. Before loading the battery cell 5 and the battery casing 4, the carrier 32 is conveyed to the loading station by the conveying mechanism. Then, the battery cell 5 and the battery casing 4 are loaded. After loading, the clamping mechanism 33 is moved to the first direction and the second direction by the driving mechanism 34 to clamp the battery cell 5 and the battery casing 4. Then, the carrier 32 is conveyed to the welding station by the conveying mechanism to weld the battery cell 5 and the battery casing 4. After welding, the carrier 32 is moved out of the welding station by the conveying mechanism. At the same time, the driving mechanism 34 drives the clamping mechanism 33 to move to the first direction and the second direction so that the clamping mechanism 33 is separated from the battery cell 5 and the battery casing 4. In this way, the welded battery cell 5 and the battery casing 4 can be taken out. Then, the conveying mechanism can convey the carrier 32 to the loading station again to load the next batch of battery cells 5 and battery casing 4.

[0077] Multiple sets of clamping mechanisms 33 can be set up, with each set of clamping mechanisms 33 arranged side by side. The carrier 32 is connected to multiple positioning seats 325. In this way, due to the side-by-side arrangement of the clamping mechanisms 33, the battery housing 4 and the battery cell 5 can be placed into the receiving cavity 321 in batches. This allows multiple clamping mechanisms 33 to clamp synchronously, greatly improving work efficiency. After clamping, the carrier 32 transports the battery cell 5 and battery housing 4 clamped by multiple clamping mechanisms 33 to the welding station for welding of the battery cell 5, battery housing 4 and current collector 8.

[0078] It is understandable that the drive mechanism 34 can be connected to multiple clamping mechanisms 33. In use, it drives multiple clamping mechanisms 33 to move synchronously to achieve batch feeding of multiple battery cells 5 and multiple battery casings 4. At the same time, the drive mechanism 34 can also drive multiple clamping mechanisms 33 to move sequentially. After clamping, the carrier 32 transports multiple battery cells 5 and battery casings 4 to the welding station for welding. During the transport, since this device can clamp multiple battery cells 5 and battery casings 4 at one time, it can meet the requirement of multiple battery cells 5 and battery casings 4 to perform efficient and continuous flying welding at the same time, thereby improving the production cycle of battery cells 5.

[0079] A tilting mechanism can be installed on the carrier 32. The tilting mechanism is used to tilt the carrier 32 so that the battery cell 5 and the battery casing 4 are tilted vertically during loading, which is convenient and efficient. After loading, the tilting mechanism tilts the carrier 32 horizontally and connects it to the conveying mechanism. During conveying and welding, the battery cell 5 and the battery casing 4 are placed horizontally, which facilitates welding by the laser 1 at the welding station.

[0080] Meanwhile, the conveying mechanism can use the principle of magnetic levitation for conveying. The conveying mechanism uses a stator rail, and the carrier 32 uses a magnetically levitated mover that moves on the magnetically levitated stator. The controller is electrically connected to the stator rail. For specific structure and principle, please refer to the magnetically levitated reciprocating conveying assembly and conveying method disclosed in Chinese Patent CN202211323699.6. Since the controller can control the distance the carrier 32 moves, position sensing plates 6 can be installed between multiple positioning seats 325. Photoelectric sensors are connected to the control module 7. Photoelectric sensors are placed on the travel trajectory of the carrier 32. 2. During the driving process, after the photoelectric sensor detects the position sensing plate 6, it converts the change in light intensity into an electrical signal and then sends the electrical signal to the control module 7. The control module 7 downloads the corresponding software, and after conversion and calculation, it can obtain the accurate position of the vehicle 32 and send the light output command to the laser 1. The laser 1 starts welding. In this way, under the precise control of magnetic levitation, the position of the vehicle 32 can be accurately fed back by the photoelectric sensor and the position sensing plate 6. During welding, the light output trajectory of the galvanometer in the laser 1 can be controlled in conjunction with the position of the vehicle 32 to achieve welding of the battery cell 5 and the battery casing 4 in motion.

[0081] like Figure 5 As shown, the drive mechanism 34 in this embodiment includes a lifting component 341 and a power component;

[0082] The lifting assembly 341 is slidably mounted on the base 31 along a first direction, and the clamping mechanism 33 is mounted on the base 31 via the lifting assembly 341. The first direction can be vertical. The clamping mechanism 33 is slidably mounted on the lifting assembly 341 along a second direction, which can be horizontal. A power assembly is used to drive the lifting assembly 341 to move so that the clamping mechanism 33 moves simultaneously in the first and second directions. The power assembly can be a device or apparatus capable of reciprocating motion.

[0083] Furthermore, such as Figure 10 In order to optimize the overall structure of the drive mechanism 34, this embodiment also provides a first movable part 35, which is connected to the base 31 and the lifting component 341, and is used to make the lifting component 341 slide relative to the base 31. A second movable part 36 is connected to the lifting component 341 and the pressing mechanism 33, and is used to make the pressing mechanism 33 move laterally relative to the base 31.

[0084] Specifically, a buffer plate 324 is installed on one side of the base 31. The buffer plate 324 is connected to multiple positioning seats 325 by bolt connection. The base 31 and the buffer plate 324 are arranged perpendicularly. A support plate 326 is provided on one side of the lifting assembly 341. The support plate 326 can be placed vertically. The first movable component 35 includes a first slide rail 351 and a first slider 352. The first slide rail 351 is vertically installed on the support plate 326, and the first slider 352 is vertically installed on the buffer plate 324. When the lifting assembly 341 moves upward, it will drive the support plate 326 to move upward, thereby causing the first slide rail 351 to move upward on the first slider 324. The lifting assembly 341 slides upwards via a sliding connection, making the vertical sliding of the lifting assembly 341 more stable. Meanwhile, the second movable component 36 includes a second slide rail 361 and a second slider 362. A base plate 328 is installed below the pressing mechanism 33. The second slide rail 361 is installed on the base plate 328, and the second slider 362 is installed on the lower side of the pressing mechanism 33. When the pressing mechanism 33 moves via the power assembly, it will drive the second slider 362 to slide on the second slide rail 361, so that the pressing mechanism 33 moves laterally relative to the lifting assembly 341. The sliding connection makes the lateral sliding of the pressing mechanism 33 more stable.

[0085] like Figures 3 to 4 As shown, in this embodiment, the base 31 is provided with a guide limiting hole 311, and the clamping mechanism 33 includes:

[0086] Mounting plate 331 and support roller 332 are mounted. Mounting plate 331 is slidably mounted on lifting assembly 341 along the second direction. Support roller 332 is fixedly mounted on mounting plate 331. Mounting plate 331 presses the negative electrode of cell 5 against the preset welding position of battery casing 4. Support roller 332 is rolled in guide limiting hole 311.

[0087] It should be noted that the support roller 332 is connected to one side of the mounting plate 331. The guide limiting hole 311 can be a combination of vertical hole and oblique hole. When the mounting plate 331 rises, the support roller 332 moves synchronously in the guide limiting hole 311. When the support roller 332 moves into the oblique hole, it will drive the mounting plate 331 to move synchronously backward and upward, so that the clamping mechanism 33 can be opened to load the battery cell 5 and the battery casing 4.

[0088] In another embodiment, the guide limiting hole 311 can be a combination of two oblique holes, with the first oblique hole having a greater inclination than the second oblique hole. This makes the movement of the mounting plate 331 smoother and also speeds up the opening of the clamping mechanism 33.

[0089] Furthermore, such as Figures 3 to 4 As shown, the clamping mechanism 33 also includes:

[0090] The pusher 333 is connected to the mounting plate 331 and is positioned opposite to one end of the positive electrode of the cell 5. This allows the negative electrode of the cell 5 to directly contact the preset welding position of the battery casing 4 and press against the current collector 8 after the cell 5 is moved.

[0091] It is understandable that the mounting plate 331 can drive the pusher 333 to move vertically so that the pusher 333 contacts the positive electrode of the battery cell 5. Then, driven by the mounting plate 331, the pusher 333 and the battery cell 5 move downward synchronously so that the battery cell 5, the battery casing 4 and the current collector 8 are pressed together. After pressing, the mounting plate 331 can drive the pusher 333 to move upward so that the pusher 333 separates from the battery cell 5, which facilitates the quick removal of the battery cell 5 after welding with the battery casing 4 and the subsequent feeding of the battery cell 5 and the battery casing 4.

[0092] Furthermore, such as Figure 5 As shown, the clamping mechanism 33 also includes:

[0093] The support block 334 is connected to the support plate 326 and is used to limit the circumferential movement of the battery cell 5.

[0094] Specifically, a contoured groove is provided on the support block 334, and the shape of the contoured groove matches the shape of the battery housing 4. When the mounting plate 331 moves downward, it will drive the support plate 326 and the support block 334 to move synchronously. The contoured groove of the support block 334 will contact the battery housing 4 to achieve circumferential limiting. In order to improve the strength of the support block 334, a reinforcing rib 327 is installed between the support block 334 and the support plate 326, which can improve the stability of the overall structure and prevent the support block 334 from contacting the battery housing 4 multiple times, which would reduce the structural strength.

[0095] Furthermore, such as Figure 5 The clamping mechanism 33 shown in this embodiment further includes:

[0096] The guide shaft 335 is movably mounted on the mounting plate 331 along the axis of the battery cell 5 and one end is connected to the push head 333; the third elastic member 336 has its two ends connected to the mounting plate 331 and the push head 333 respectively.

[0097] Specifically, a slot can be opened in the mounting plate 331, and a linear bearing is installed in the slot. The linear bearing is connected to the guide shaft 335 so that the guide shaft 335 can move vertically stably. At the same time, the third elastic element 336 can be a rectangular spring. The rectangular spring is sleeved on the outside of the guide shaft 335. After the material is loaded, the push head 333 presses down on the battery cell 5 and the battery casing 4. At this time, the push head 333 moves upward under the reaction force of the battery cell 5, and the rectangular spring is compressed. The rectangular spring plays a role in pressing and buffering the push head 333 to prevent the battery cell 5 from being subjected to the impact of the push head 333 pressing down.

[0098] Furthermore, such as Figures 5 to 6 As shown, the lifting component 341 in this embodiment includes:

[0099] The lifting plate 3411 and the first elastic element 3412 are connected at one end to the lifting plate 3411 and at the other end to the base 31. A cam follower 3414 can be installed on the upper end of the lifting plate 3411. The lifting plate 3411 is raised by opening the clamping cam follower 3414 and pulling the cam follower 3414 upward. The first elastic element 3412 can be a tension spring. After the loading is completed, the carrier 32 is flipped to a horizontal state for flying welding. The tension spring can provide clamping force to compress the rectangular spring, thereby providing a greater welding clamping force. A support column 3413 can be installed on the lifting plate 3411 to facilitate the installation and removal of the tension spring.

[0100] Understandably, before the battery cell 5 and battery casing 4 are loaded, the first elastic element 3412 is in a stretched state, and the lifting plate 3411 is pressed downward under the action of the first elastic element 3412, causing the mounting plate 331 to move downward. At the same time, the push head 333 blocks the loading space of the battery cell 5, and the clamping mechanism 33 is in a closed state. When the battery cell 5 and battery casing 4 are loaded, the lifting plate 3411 is driven upward by the power component, and the clamping mechanism 33 is opened. At this time, the push head 333 on the mounting plate 331 forms a barrier. The space allows for easy loading of the battery cell 5 and battery casing 4 into the receiving cavity 321. After the battery cell 5 and battery casing 4 are loaded, the power component releases the lifting plate 3411. At this time, the lifting plate 3411 moves down under the action of elasticity and gravity, so that the push head 333 contacts the positive electrode of the battery cell 5 and firmly presses the battery cell 5 and battery casing 4 together. In this way, the first elastic element 3412 can realize the automatic pressing of the pressing mechanism 33, without the need for an additional pressing mechanism 33 to press, which is convenient to operate and has a low cost.

[0101] like Figures 7 to 8 As shown, in this embodiment, the inner wall of the receiving cavity 321 is formed with a mounting groove 322. The carrier 32 includes a clamping component 323. The clamping component 323 is rotatably installed in the mounting groove 322 to elastically clamp the battery housing 4. The clamping component 323 can achieve circumferential clamping of the battery housing 4 and the battery cell 5, thereby improving the positioning accuracy of the battery housing 4 and the battery cell 5, so as to avoid the situation of explosion points caused by low positioning accuracy during subsequent welding.

[0102] Furthermore, such as Figures 7 to 8 As shown, the clamping component 323 in this embodiment includes:

[0103] A contour positioning block 3231 is installed in the receiving cavity 321, and the contour positioning block 3231 is positioned opposite to the battery cell 5. The shape of one side of the contour positioning block 3231 matches the shape of the battery cell 5. An installation groove 322 is provided in the receiving cavity 321 so that the contour positioning block 3231 can move within the installation groove 322. A rotating shaft 3232 is connected to the contour positioning block 3231. The rotating shaft 3232 is arranged horizontally and its two ends are rotatably connected to the installation groove 322. It is used to drive one side of the contour positioning block 3231 to rotate relative to the outside of the battery cell 5. A second elastic member 3233 has its two ends connected to the contour positioning block 3231 and the installation groove 322 respectively. When the battery housing 4 is loaded in the carrier 32, it causes the contour positioning block 3231 to be forced to fit against the outer wall of the battery housing 4.

[0104] It should be noted that the contour positioning block 3231 is larger at the top and smaller at the bottom. Multiple contour positioning blocks 3231 can be arranged circumferentially, and multiple contour positioning blocks 3231 surround the outer periphery of the battery casing 4. The second elastic element 3233 can be a compression spring. A through groove is opened on the side of the positioning seat 325 to facilitate the installation of the compression spring. At the same time, a spring baffle 3235 can be installed on the side of the positioning seat 325. One end of the compression spring is connected to the spring baffle 3235 to facilitate the installation and replacement of the compression spring. A welding pressure head 3234 is installed at the bottom of the positioning seat 325 to ensure the concentricity of the collector plate 8 and the welding pressure head 3234 after loading.

[0105] It is understandable that when the battery casing 4 enters the receiving cavity 321, the lower peripheral wall of the battery casing 4 presses against the lower end of the contour positioning block 3231. The contour positioning block 3231 rotates under pressure driven by the rotating shaft 3232, and the second elastic element 3233 is compressed. Under the action of elastic force, the contour positioning block 3231 clamps the lower peripheral wall of the battery casing 4. The upper end of the contour positioning block 3231 is in close contact with the peripheral wall of the battery casing 4 to achieve the effect of clamping and positioning the battery casing 4. The degree of rotation of the contour positioning block 3231 should be such that after the battery casing 4 is loaded, the battery casing 4 can slightly open the contour positioning block 3231.

[0106] like Figure 10 As shown, in this embodiment, the laser scanning system 2 includes a focal scanning unit 21 and a 3D galvanometer unit 22;

[0107] The focal scanning unit 21 is positioned opposite to the laser 1 and is used to emit a measurement beam that is collinear with the laser beam. The measurement beam is used to directly measure the positional offset between the cell 5 and the battery casing 4.

[0108] The 3D galvanometer unit 22 is connected to the control module 7 and is used to adjust the focal length of the laser beam in real time by changing the reflection direction of the laser beam according to the focal offset sent by the control module 7, so that the laser beam is focused on the processing surface of the cell 5 and the battery casing 4 in real time for welding.

[0109] Furthermore, in this embodiment, the focus scanning unit 21 includes:

[0110] Measurement light source 211 is used to emit a measurement beam;

[0111] The reflector 212 is positioned relative to the path of the measurement beam to reflect the measurement beam so that it is collinear with the laser beam;

[0112] Beam combiner 213 is positioned opposite to the collinear measurement beam and laser beam to combine the optical paths of the measurement beam and laser beam.

[0113] Understandably, since the measuring beam and the laser beam are collinear, the focal length can be measured before each laser processing operation when the battery cell 5 and the battery casing 4 reach the processing position, and the focal length deviation can be corrected in time. This minimizes the impact on processing time, and since no moving mechanism is required during the measurement process, the impact of measurement on laser processing time is also minimized; it is suitable for rapid measurement in large-scale production, ensuring automated and efficient production.

[0114] To improve the quality of the beams emitted by the measuring light source 211 and the laser 1, a collimating lens 23 is placed at the emitting end of the measuring light source 211 and the laser 1. The collimating lens 23 is used to convert the measuring beam and the laser beam into quasi-parallel light, thereby ensuring the accuracy of the laser optical path and the measuring optical path.

[0115] like Figure 10 and Figure 11 As shown, in this embodiment, the 3D galvanometer unit 22 includes:

[0116] A galvanometer 221 is positioned relative to the path of the laser beam to reflect the laser beam. Multiple galvanometers 221 are configured, with the first galvanometer 221 located on the path of the laser beam and the remaining galvanometers 221 arranged sequentially according to the reflection direction of each galvanometer 221.

[0117] Field mirror 222 is arranged opposite to the reflection direction of galvanometer 221 and is used to project the laser beam reflected by galvanometer 221 onto the processing surface of cell 5 and battery casing 4. Field mirror 222 is located in the reflection direction of the last galvanometer 221, so that the laser beam reflected by galvanometer 221 is reflected again by field mirror 222 onto the processing surface of cell 5 and battery casing 4.

[0118] The galvanometer motor 223 is connected to multiple galvanometers 221 and is used to control the rotation of the galvanometers 221 to change the reflection direction of the laser beam and adjust the focal length of the laser beam in real time. The output shaft of the galvanometer motor 223 can be tilted to the galvanometers 221. When the galvanometer motor 223 rotates, it will drive the galvanometers 221 to tilt and rotate, thereby changing the incident angle of the laser beam and adjusting the focal length of the laser beam in turn.

[0119] The drive controller 224 is connected to the control module 7 and the galvanometer motor 223, and is used to control the galvanometer motor 223 to rotate by a corresponding angle according to the focal offset sent by the control module 7.

[0120] like Figure 10 and Figure 11 As shown, in this embodiment, the galvanometer 221 includes:

[0121] X-axis reflector 2211 and Y-axis reflector 2212 are connected to galvanometer motor 223 and are used to work together to change the planar position of the laser beam so that the laser beam can perform trajectory scanning in the plane. X-axis reflector 2211 and Y-axis reflector 2212 are responsible for two-dimensional plane scanning.

[0122] Z-axis reflector 2213, connected to galvanometer motor 223, is used to adjust the focal length of the laser beam in real time so that the laser beam is finally focused on the processing surface of cell 5 and battery casing 4. Z-axis reflector 2213 is controlled by control module 7 to achieve real-time adjustment of focal position.

[0123] Understandably, the 3D galvanometer unit 22 coordinates the dynamic focusing and scanning of the X, Y, and Z axes through the X-axis reflector 2211, Y-axis reflector 2212, and Z-axis reflector 2213 to achieve high-precision, large-area laser processing. By coordinating the rotation of the X and Y axis reflectors, the reflection direction of the laser can be changed, enabling complex trajectory scanning in the plane (such as circular or arc-shaped welds). The control module adjusts the focal length in real time based on optical path calculation to adjust the Z-axis reflector 2213, ensuring that the laser spot is always focused on the processing surface, thereby improving accuracy.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent welding system integrating real-time focal length compensation function, characterized in that, include: Laser (1), used to emit a laser beam; A laser scanning system (2) is set opposite to the laser (1) and is used to measure the positional offset of the cell (5) and the battery casing (4) and adjust the focal length of the laser beam in real time so that the laser beam is focused on the processing surface of the cell (5) and the battery casing (4) in real time for welding. The control module (7) is connected to the laser scanning system (2) and is used to obtain the position offset measured by the laser scanning system (2), calculate the focal offset, and send the focal offset to the laser scanning system (2) to adjust the focal length of the laser beam in real time. The clamping and positioning mechanism (3) connects the battery cell (5) and the battery housing (4) and makes the battery cell (5) fit tightly against the battery housing (4), and transports the battery cell (5) and the battery housing (4) to the welding station.

2. The intelligent welding system with integrated real-time focal length compensation function according to claim 1, characterized in that, The clamping and positioning mechanism (3) includes: Base (31); The carrier (32) is mounted on the base (31) and its end face is provided with a receiving cavity (321) for receiving the battery cell (5) and the battery casing (4); A clamping mechanism (33) is installed on the base (31) and is disposed opposite to the carrier (32) to make the cell (5) fit tightly against the battery casing (4); A drive mechanism (34) is used to drive the clamping mechanism (33) to move simultaneously along a first direction and a second direction to clamp the battery casing (4) and the battery cell (5) inside the carrier (32).

3. The intelligent welding system with integrated real-time focal length compensation function according to claim 2, characterized in that, The drive mechanism (34) includes a lifting component (341) and a power component; The lifting assembly (341) is slidably mounted on the base (31) along the first direction, and the clamping mechanism (33) is mounted on the base (31) via the lifting assembly (341); The clamping mechanism (33) is slidably mounted on the lifting assembly (341) along the second direction; The power assembly is used to drive the lifting assembly (341) to move so that the clamping assembly moves simultaneously in a first direction and a second direction.

4. The intelligent welding system with integrated real-time focal length compensation function according to claim 3, characterized in that, The base (31) is provided with a guide limiting hole (311); The clamping mechanism (33) includes a mounting plate (331) and a support roller (332). The mounting plate (331) is slidably mounted on the lifting assembly (341) along the second direction, and the support roller (332) is fixedly mounted on the mounting plate (331). The roller (332) is rolled within the guide limiting hole (311).

5. The intelligent welding system with integrated real-time focal length compensation function according to claim 3, characterized in that, The lifting assembly (341) includes a lifting plate (3411) and a first elastic member (3412), one end of which is connected to the lifting plate (3411) and the other end of which is connected to the base (31).

6. The intelligent welding system with integrated real-time focal length compensation function according to claim 2, characterized in that, The inner wall of the receiving cavity (321) is formed with an installation groove (322); The carrier (32) includes a clamping assembly (323), which is rotatably mounted in the mounting groove (322) to elastically clamp the battery housing (4).

7. The intelligent welding system integrating real-time focal length compensation function according to claim 6, characterized in that, The clamping component (323) includes a contour positioning block (3231), a rotating shaft (3232), and a second elastic element (3233); The rotating shaft (3232) is installed in the mounting groove (322), and the contour positioning block (3231) is rotatably installed in the mounting groove (322) via the rotating shaft (3232); The two opposite ends of the second elastic element (3233) are respectively connected to the contour positioning block (3231) and the mounting groove (322); When the battery housing (4) is loaded into the carrier (32), the contour positioning block (3231) is forced to fit against the outer wall of the battery housing (4).

8. The intelligent welding system with integrated real-time focal length compensation function according to claim 1, characterized in that, The laser scanning system (2) includes a focal scanning unit (21) and a 3D galvanometer unit (22); The focal scanning unit (21) is arranged opposite to the laser (1) and is used to emit a measurement beam and the measurement beam is collinear with the laser beam. The measurement beam directly measures the positional offset between the cell (5) and the battery casing (4). The 3D galvanometer unit (22) is connected to the control module (7) and is used to adjust the focal length of the laser beam in real time by changing the reflection direction of the laser beam according to the focal offset sent by the control module (7), so that the laser beam is focused on the processing surface of the cell (5) and the battery casing (4) in real time for welding.

9. The intelligent welding system with integrated real-time focal length compensation function according to claim 8, characterized in that, The 3D galvanometer unit (22) includes: A galvanometer (221) is positioned opposite to the path of the laser beam to reflect the laser beam; A field mirror (222) is arranged opposite to the reflection direction of the galvanometer (221) and is used to project the laser beam reflected by the galvanometer (221) onto the processing surfaces of the cell (5) and the battery casing (4). A galvanometer motor (223) is connected to the galvanometer (221) and is used to control the rotation of the galvanometer (221) to change the reflection direction of the laser beam in order to adjust the focal length of the laser beam in real time. The drive controller (224) is connected to the control module (7) and the galvanometer motor (223) and is used to control the galvanometer motor (223) to rotate by a corresponding angle according to the focal offset sent by the control module (7).

10. The intelligent welding system integrating real-time focal length compensation function according to claim 9, characterized in that, The galvanometer (221) includes: The X-axis reflector (2211) and Y-axis reflector (2212) are connected to the galvanometer motor (223) and are used to cooperate in changing the planar position of the laser beam so that the laser beam can perform trajectory scanning in the plane. The Z-axis reflector (2213) is connected to the galvanometer motor (223) and is used to adjust the focal length of the laser beam in real time so that the laser beam is finally focused on the processed surfaces of the cell (5) and the battery casing (4).

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