A laser welding device for detecting a laser welding contact surface

Abstract

The application discloses a kind of detection laser welding contact surface laser welding device, including conveying module, battery bearing module being slidably connected on conveying module and laser welding module, and welding piece is placed in battery bearing module and is conveyed to the lower side of laser welding module by conveying module.Simultaneously, detection laser welding contact surface laser welding device also includes servo drive module, presser jaw, welding contact block and resistance tester.Servo drive module is located at the side of conveying module conveying end;Presser jaw is connected to servo drive module, and presser jaw is transversely spaced at least two, and two presser jaws are all connected with wire;Welding contact block is arranged below welding piece;Resistance tester is electrically connected with welding contact block;Servo drive module drives presser jaw to move vertically and contact with welding piece.It can be distinguished that the welding piece of poor contact is judged in advance before starting welding, which can improve safety, and effectively reduce the failure rate of welded workpiece, so as to save repair cost.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to a laser welding apparatus for detecting the contact surface of laser welding. Background Technology

[0002] In lithium battery manufacturing processes, advanced laser welding technology is employed in various steps, including explosion-proof valve sealing welding, subsequent welding, flexible connection welding, safety cap spot welding, battery casing sealing welding, and module and PACK welding. For instance, the welding quality between the cell tabs and the protection circuit module (PCM) directly affects battery performance and safety. Before welding, it is essential to ensure the cleanliness, adhesion, and conductivity of the contact surfaces between the cell tabs and the PCM board. If the contact surfaces contain oxide layers, contaminants, or are not fully adhered, defects such as incomplete welding and bursting points can easily occur during welding, leading to increased internal resistance, increased risk of thermal runaway, and even safety hazards.

[0003] In the existing technology, the inspection of welded contact surfaces mainly relies on manual inspection, such as visual inspection or random inspection of the contact surface by manual multimeter, or centralized batch inspection using separate testing equipment. Some automated welding equipment indirectly judges the quality by electrical performance testing after welding.

[0004] Therefore, existing methods for inspecting welded contact surfaces, such as manual inspection, suffer from incomplete inspection, leading to a high defect rate in finished welded parts and increased rework costs. Using separate inspection equipment, on the other hand, may increase equipment costs and slow down battery manufacturing processes. To address these issues, there is an urgent need for a low-cost, highly reliable, real-time feedback pre-welding contact surface inspection solution to quickly identify poor contact before the welding process, preventing defects from spreading to subsequent stages. Summary of the Invention

[0005] The purpose of this invention is to provide a laser welding device for detecting the contact surface of laser welding, thereby solving the problems of incomplete detection and increased equipment costs in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A laser welding apparatus for detecting the contact surface of laser welds includes a conveying module, a battery carrying module slidably connected to the conveying module, and a laser welding module disposed above the conveying module. The weldment is placed in the battery carrying module and conveyed by the conveying module to the area below the laser welding module. The laser welding apparatus for detecting the contact surface of laser welds further includes:

[0008] A servo drive module is located on one side of the conveying end of the conveying module;

[0009] The pressure claw is connected to the servo drive module. At least two pressure claws are arranged laterally, and each pressure claw is connected to a wire.

[0010] A welding contact block is located below the welded component;

[0011] The resistance tester is electrically connected to the welding contact block;

[0012] The battery carrying module is equipped with a clamping assembly, one end of the conveying module is an operating station, and the laser welding module and the pressure claw are both located directly above the operating station.

[0013] The welded component is transported to the operating station by the battery carrying module, and is sequentially positioned, inspected, and welded at the operating station. During the inspection and welding processes, the servo drive module drives the pressure claw to move vertically and come into contact with the welded component.

[0014] Optionally, the welded component includes two battery cell tabs and PCM board contacts respectively placed on the two battery cell tabs.

[0015] Optionally, both the end of the pressure claw and the welding contact block are gold-plated copper blocks.

[0016] Optionally, the laser welding device for detecting the laser welding contact surface further includes a worktable, and the conveying module is fixed on the worktable. The conveying module includes:

[0017] A conveyor track is fixed to the worktable, and a slider is slidably connected to the conveyor track.

[0018] A conveyor is fixedly connected to the conveyor track, and the battery carrier module is placed on the conveyor.

[0019] A drive unit, connected to the conveyor, is used to drive the conveyor to slide on the conveyor track.

[0020] Optionally, the battery carrying module includes:

[0021] A support seat is fixed to the conveyor, and the support seat has an installation groove, with the welding contact block embedded in the bottom of the installation groove.

[0022] A protective plate is disposed on one side of the mounting groove, and the protective plate is an insulating plate.

[0023] A clamp assembly, disposed on the support, is used to position and secure the battery.

[0024] Optionally, the clamp assembly includes:

[0025] The first positioning block is slidably connected to the bearing seat via the first guide rod;

[0026] The second positioning block is slidably connected to the bearing seat via the second guide rod. The first positioning block and the second positioning block are perpendicular to each other and are located on opposite sides of the mounting groove.

[0027] A sliding block is fixedly connected to the first positioning block, and an inclined block is provided on one side of the sliding block;

[0028] A driven block is fixedly connected to the second positioning block. The end of the driven block is provided with an inclined surface, and the inclined surface is parallel to the inclined side of the inclined block. A roller is rotatably connected to the side of the driven block with the inclined surface, and the roller abuts against the inclined side of the inclined block.

[0029] A cylinder is fixed to the conveying carrier, and the telescopic end of the cylinder is connected to the sliding block.

[0030] Optionally, the servo drive module includes:

[0031] A fixed frame is fixed to the workbench, and a vertically arranged guide rail is fixedly connected to the side of the fixed frame facing the conveying module;

[0032] A fixed base is slidably connected to the guide rail, and the fixed base is provided with a transverse mounting groove;

[0033] Mounting base, the mounting base is movably connected to the fixed base via the mounting groove, and the pressure claw is connected to the mounting base;

[0034] A ball screw is rotatably connected to the fixed frame, and the fixed seat is threadedly connected to the ball screw;

[0035] A servo motor is fixedly connected to the mounting frame, and the output shaft of the servo motor is connected to the ball screw drive.

[0036] Optionally, the mounting base has multiple mounting positions, each of which is equipped with a sliding seat, and the pressure claw is movably connected to the sliding seat.

[0037] Optionally, the laser welding apparatus for detecting the laser welding contact surface further includes:

[0038] A pressure sensor is located on the lower end face of the pressure claw;

[0039] The control module is electrically connected to the pressure sensor, the servo motor, and the resistance tester.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] In a laser welding device for detecting the contact surface of laser welding provided in this embodiment of the invention, the battery to be welded is placed in a battery carrying module and transported to the operating station by a conveying module. The battery to be welded is first clamped and positioned by a fixture assembly at the operating station. Then, a servo drive module drives the pressure claw to move towards the battery, so that the pressure claw contacts the welding part of the battery and applies pressure. At the same time, current is passed into the wire. The current flows from the pressure claw on one side to the welding part and the welding contact block, and finally flows to the pressure claw on the other side, thus forming a closed loop. The contact resistance of the welding part is measured by a resistance tester, and the quality of the welding contact is judged based on the magnitude of the contact resistance. After the detection is completed, the current in the wire is disconnected. The fixture assembly continues to clamp and position the welding part, while the pressure claw continues to press the welding part, and then the laser welding module performs welding. Before welding begins, identifying poorly contacted weldments prevents defects such as incomplete welds and bursts that could lead to unqualified welds, improving safety and effectively reducing the defect rate, thus saving on rework costs. Furthermore, once the weldment is positioned by the fixture assembly at the operating station, inspection and welding processes can be completed sequentially without the need for transfer or secondary positioning. The pressure claws provide pressure and positioning for the weldment during both inspection and welding, preventing slight displacement during these processes. This not only saves costs but also further improves the pass rate of the welded parts. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0044] Figure 1 This is a schematic diagram of a laser welding device for detecting the contact surface of laser welding.

[0045] Figure 2 This is a schematic diagram of a laser welding device for detecting the contact surface of laser welding.

[0046] Figure 3This is a partial structural diagram of a laser welding device for detecting the contact surface of laser welding.

[0047] Figure 4 This is a schematic diagram of the battery-carrying module in a laser welding device for detecting the contact surface of laser welding.

[0048] Figure 5 This is a schematic diagram of the fixture assembly in a laser welding device for detecting the contact surface of laser welding.

[0049] Figure 6 This is a partial structural diagram of a laser welding device for detecting the contact surface of laser welding.

[0050] Illustrations: 1. Workbench; 2. Conveying module; 21. Conveying track; 22. Conveying carrier; 23. Drive component; 3. Battery carrying module; 31. Carrier seat; 32. Mounting slot; 33. Protective plate; 34. Fixture assembly; 341. First positioning block; 342. First guide rod; 343. Second positioning block; 344. Second guide rod; 345. Sliding block; 3451. Inclined block; 346. Driven block; 3461. Roller; 347. Cylinder; 4. Laser welding module; 5. Servo drive module; 51. Fixed seat; 52. Mounting seat; 53. Ball screw; 54. Servo motor; 55. Sliding seat; 6. Claw; 61. Wire; 7. Welding contact block; 8. Resistance tester; 9. Welded part; 91. Cell tab; 92. PCM board contact piece. Detailed Implementation

[0051] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0052] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0053] This invention provides a laser welding device for detecting the contact surface of laser welds, including a conveying module, a battery carrying module slidably connected to the conveying module, and a laser welding module disposed above the conveying module. The laser welding device for detecting the contact surface of laser welds also includes a servo drive module, pressure claws, a welding contact block, and a resistance tester. The servo drive module is located on one side of the conveying end of the conveying module; the pressure claws are connected to the servo drive module, with at least two pressure claws spaced laterally, and each pressure claw is connected to a wire; the welding contact block is located below the workpiece; the resistance tester is electrically connected to the welding contact block; a clamping assembly is provided on the battery carrying module, and one end of the conveying module is an operating station, with the laser welding module and pressure claws located directly above the operating station; wherein, the workpiece is conveyed from the battery carrying module to the operating station, where positioning, detection, and welding processes are performed sequentially, and during the detection and welding processes, the servo drive module drives the pressure claws to move vertically and contact the workpiece.

[0054] In a laser welding device for detecting the contact surface of laser welding provided in this embodiment of the invention, the battery to be welded is placed in a battery carrying module and transported to the operating station by a conveying module. The battery to be welded is first clamped and positioned by a fixture assembly at the operating station. Then, a servo drive module drives the pressure claw to move towards the battery, so that the pressure claw contacts the welding part of the battery and applies pressure. At the same time, current is passed into the wire. The current flows from the pressure claw on one side to the welding part and the welding contact block, and finally flows to the pressure claw on the other side, thus forming a closed loop. The contact resistance of the welding part is measured by a resistance tester, and the quality of the welding contact is judged based on the magnitude of the contact resistance. After the detection is completed, the current in the wire is disconnected. The fixture assembly continues to clamp and position the welding part, while the pressure claw continues to press the welding part, and then the laser welding module performs welding. Before welding begins, identifying poorly contacted weldments prevents defects such as incomplete welds and bursts that could lead to unqualified welds, improving safety and effectively reducing the defect rate, thus saving on rework costs. Furthermore, once the weldment is positioned by the fixture assembly at the operating station, inspection and welding processes can be completed sequentially without the need for transfer or secondary positioning. The pressure claws provide pressure and positioning for the weldment during both inspection and welding, preventing slight displacement during these processes. This not only saves costs but also further improves the pass rate of the welded parts.

[0055] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0056] like Figures 1-6As shown, this embodiment of the invention provides a laser welding device for detecting the contact surface of laser welds, including a conveying module 2, a battery carrying module 3 slidably connected to the conveying module 2, and a laser welding module 4 disposed above the conveying module 2. One end of the conveying module 2 is an operating station, and the laser welding module 4 is disposed directly above the operating station. The battery to be welded is conveyed from the previous process to the battery carrying module 3, or the operator places the battery to be welded in the battery carrying module and conveys it to the operating station through the conveying module 2. Before welding begins, the contact surface of the weldment 9 is inspected to determine the quality of the contact surface. If the contact is poor, an alarm can be triggered or the process can be returned to the previous process. Welding can begin on weldment 9 that passes the test. This effectively avoids defects such as incomplete welds and bursts during welding, which can lead to unqualified welded workpieces and improve safety. At the same time, identifying weldment 9 with poor contact in advance can also effectively reduce the defect rate of welded workpieces and save on rework costs.

[0057] Furthermore, the laser welding device for inspecting the laser welding contact surface also includes a servo drive module 5, a pressure claw 6, a welding contact block 7, and a resistance tester 8. The servo drive module 5 is located on one side of the conveying end of the conveying module 2; the pressure claw 6 is connected to the servo drive module 5, and at least two pressure claws are arranged horizontally at intervals, with wires 61 connected to both pressure claws 6; the welding contact block 7 is located below the welded part 9; the resistance tester 8 is electrically connected to the welding contact block 7; a clamp assembly 34 is provided on the battery carrying module 3, and the laser welding module 4 and the pressure claw 6 are both located directly above the operating station; wherein, the welded part 9 is conveyed to the operating station by the battery carrying module 3, and the positioning, inspection, and welding processes are performed sequentially at the operating station, and during the inspection and welding processes, the servo drive module 5 drives the pressure claw 6 to move vertically and contact the welded part 9.

[0058] It should be noted that contact resistance is generated between contacting conductors, and this contact resistance is affected by factors such as the contact material, the normal force, the surface condition of the contact, and the magnitude of voltage and current. Therefore, based on the material properties of the welding part 9 of the battery to be welded, an appropriate contact resistance threshold is determined by controlling the magnitude of voltage, current, and normal force, and the quality of contact of the welding part 9 is judged based on this threshold.

[0059] Specifically, the servo drive module 5 is located on one side of the conveying end of the conveying module 2 and below the laser welding module 4. When the servo drive module 5 is started, it drives the pressure claw 6 to move up and down in the vertical direction. The pressure claw 6 is used to press the welding part 9, which can prevent the welding part 9 from shifting during welding and can also generate positive pressure on the welding part 9 to measure the contact resistance of the welding part 9. In this embodiment, there are two pressure claws 6, two welding parts 9, and two welding contact blocks 7. Both the pressure claws 6 and the welding contact blocks 7 are conductive. Both pressure claws 6 are connected to wires 61, and the two welding contact blocks 7 are electrically connected through wires. A current is passed through the conductor 61, and the current flows sequentially through the pressure claw 6 on one side, the welded part 9 on that side, the welded contact block 7 on that side, the welded contact block 7 on the other side, the welded part 9 on the other side, and the pressure claw 6 on the other side, thus completing a closed circuit. The welded contact block 7 is electrically connected to the resistance tester 8, so the resistance tester 8 can measure the contact resistance when the pressure claw 6 presses the welded part 9. By comparing the measured contact resistance with a set threshold, the quality of the welded part 9 can be determined.

[0060] In the battery welding process, the battery to be welded is placed in the battery carrier module 3 and transported to the operating station by the conveying module 2. The battery to be welded is first clamped and positioned by the clamping assembly 34 at the operating station. Then, the servo drive module 5 drives the pressure claw 6 to move towards the battery, so that the pressure claw 6 contacts the welding part 9 of the battery and applies pressure. At the same time, current is passed into the wire. The current flows from the pressure claw on one side to the welding part 9 and the welding contact block 7, and finally flows to the pressure claw 6 on the other side, thus forming a closed loop. The contact resistance of the welding part 9 is measured by the resistance tester 8, and the quality of the contact of the welding part 9 is judged according to the contact resistance. After the test is completed, the current in the wire is disconnected. The clamping assembly 34 continues to clamp and position the welding part 9, while the pressure claw 6 continues to press the welding part 9, and then the laser welding module 4 performs welding. This system achieves the goal of identifying poorly contacted weldment parts 0 before welding begins, effectively reducing the defect rate of welded workpieces and thus saving rework costs. Simultaneously, after weldment part 0 is positioned at the operating station by the fixture assembly 34, the inspection and welding processes can be completed sequentially without the need for transfer or secondary positioning. Furthermore, the pressure claws 6 can press and position the weldment part 9 during both inspection and welding, preventing slight displacement of the weldment part 9 during these processes. This not only saves costs but also further improves the pass rate of welded workpieces.

[0061] In this embodiment of the invention, taking the battery cell tabs 91 of a welded battery as an example, the welded component 9 consists of two battery cell tabs 91 and PCM board contact plates 92 respectively placed on the two battery cell tabs 91. Two pressure claws 6 apply positive pressure to the corresponding PCM board contact plates 92, thereby detecting the contact resistance between the PCM board contact plates 92 and the battery cell tabs 91.

[0062] For example, both the ends of the pressure claw 6 and the welding contact block 7 are gold-plated copper blocks. This reduces contact resistance and improves testing accuracy. Furthermore, the gold-plated copper blocks have good corrosion resistance and oxidation resistance, which helps extend service life and facilitates compatibility with batteries made of various materials.

[0063] like Figure 1 As shown, in this embodiment of the invention, the laser welding device for detecting the laser welding contact surface further includes a worktable 1, a conveying module 2 fixed on the worktable 1, and the conveying module 2 including a conveying track 21, a conveying carrier 22, and a driving component 23. The conveying track 21 is fixed on the worktable 1, and a slider is slidably connected to the conveying track 21; the conveying carrier 22 is fixedly connected to the conveying track 21, and the battery carrying module 3 is placed on the conveying carrier 22; the driving component 23 is connected to the conveying carrier 22 and is used to drive the conveying carrier 22 to slide on the conveying track 21.

[0064] Specifically, a frame can be fixed on the workbench 1, and the laser welding module 4 can be installed on the top of the frame. The drive component 23 can be a linear motor, hydraulic cylinder, etc. The drive component 23 is activated to drive the conveyor 22 to reciprocate along the conveyor track 21. The starting end of the conveyor track 21 can be connected to the end of the previous process, which is conducive to realizing automated production. The battery carrier module 3 is installed on the conveyor 22. When the slider slides on the conveyor track 21, it can drive the conveyor 22 and the battery carrier module 3 to reciprocate along the conveyor track 21. For batteries of different specifications, the battery carrier module 3 can be replaced to realize the testing and welding of batteries of different specifications, which is conducive to improving the versatility of the laser welding device.

[0065] like Figure 3 , Figure 4 , Figure 5 As shown, in this embodiment of the invention, the battery carrier module 3 includes a carrier base 31, a protective plate 33, and a clamping assembly 34. The carrier base 31 is fixed on the conveying carrier 22, and a mounting groove 32 is provided on the carrier base 31. The welding contact block 7 is embedded in the bottom of the mounting groove 32. The protective plate 33 is provided on one side of the mounting groove 32, and the protective plate 33 is an insulating plate. The clamping assembly 34 is provided on the carrier base 31 and is used to position and fix the battery.

[0066] Specifically, the carrier 31 is detachably mounted on the conveyor 22. The mounting groove 32 is located on the upper surface of the carrier 31 and is used to embed the battery. The protection plate 33 is disposed in the mounting groove 32 on the side near the servo drive module 5. When the battery is placed in the mounting groove 32, the battery cell tabs 91 can abut against the insulating protection plate 33 to protect the cell tabs 91. At the same time, the clamp assembly 34 is used to position and fix the battery in the mounting groove 32 to prevent the battery from shifting during testing and causing inaccurate test results.

[0067] Furthermore, the clamping assembly 34 includes a first positioning block 341, a second positioning block 343, a sliding block 345, a driven block 346, and a cylinder 347. The first positioning block 341 is slidably connected to the bearing seat 31 via the first guide rod 342; the second positioning block 343 is slidably connected to the bearing seat 31 via the second guide rod 344. The first positioning block 341 and the second positioning block 343 are perpendicular to each other and are located on adjacent sides of the mounting groove 32 respectively; the sliding block 345 is fixedly connected to the first positioning block 341, and an inclined block 3451 is provided on one side of the sliding block 345; the driven block 346 is fixedly connected to the second positioning block 343, and an inclined surface is provided at the end of the driven block 346, and the inclined surface is parallel to the inclined side of the inclined block 3451. A roller 3461 is rotatably connected to the side of the driven block 346 with the inclined surface, and the roller 3461 abuts against the inclined side of the inclined block 3451; the cylinder 347 is fixed on the conveying carrier 22, and the telescopic end of the cylinder 347 is connected to the sliding block 345.

[0068] Specifically, two grooves are formed on the side of the mounting groove 32 on the support 31. The two grooves are located on adjacent sides of the mounting groove 32. The first positioning block 341 and the second positioning block 343 are located in the two grooves respectively. Two first guide rods 342 are provided and fixed to the side wall of one of the grooves. Two second guide rods 344 are also provided and fixed to the side wall of the other groove. Both the first guide rods 342 and the second guide rods 344 extend toward the mounting groove 32. The first positioning block 341 is movably inserted through the two first guide rods 342, and the second positioning block 343 is movably inserted through the two second guide rods 344. When the first positioning block 341 and the second positioning block 343 slide, the length and width of the mounting groove 32 can be changed.

[0069] Meanwhile, the sliding block 345 can be located below the mounting groove 32 and penetrate the bearing seat 31. One end of the sliding block 345 is fixedly connected to the first positioning block 341, and the other end is located outside the bearing seat 31. The telescopic end of the cylinder 347 is fixedly connected to the sliding block 345. Therefore, when the cylinder 347 telescopically extends or retracts, it can drive the first positioning block 341 to slide along the first guide rod 342. The driven block 346 is fixed on the second positioning block 343. The driven block 346 is perpendicular to the length direction of the sliding block 345. A protruding inclined block 3451 is provided on the side of the sliding block 345 near the driven block 346. The inclined side of the inclined block 3451 faces the driven block 346. The end of the driven block 346 is also processed into a sharp angle, and the side of the driven block 346 facing the sliding block 345 is parallel to the inclined side of the inclined block 3451. Therefore, if the tip of the inclined block 3451 is in contact with the sharp corner of the driven block 346, when the cylinder 347 drives the sliding block 345 to move laterally, the sliding block 345 will push the driven block 346 to move longitudinally, thereby enabling the first positioning block 341 and the second positioning block 343 to slide simultaneously. Furthermore, a roller 3461 is rotatably provided on the sharp corner of the driven block 346. The roller 3461 abuts against the inclined side of the inclined block 3451. Therefore, when the inclined block 3451 moves laterally, it will drive the roller 3461 to rotate, thereby driving the driven block 346 and the second positioning block 343 to move longitudinally. By providing the roller 3461, the friction between the inclined block 3451 and the driven block 346 can be reduced, making the sliding of the first positioning block 341 and the second positioning block 343 smoother.

[0070] In addition, a spring can be fitted on the second guide rod 344. The spring is located between the second positioning block 343 and the side wall of the groove. Thus, when the cylinder 347 extends or retracts, the first positioning block 341 and the second positioning block 343 can slide simultaneously away from or towards the mounting groove 32, which facilitates the automatic positioning and fixing of the battery.

[0071] like Figure 4 , Figure 5 As shown, in this embodiment of the invention, the servo drive module 5 includes a fixed frame, a fixed base 51, a mounting base 52, a ball screw 53, and a servo motor 54. The fixed frame is fixed to the worktable 1, and a vertically arranged guide rail is fixedly connected to the side of the fixed frame facing the conveying module 2; the fixed base 51 is slidably connected to the guide rail, and a horizontal mounting groove 32 is provided on the fixed base 51; the mounting base 52 is movably connected to the fixed base 51 through the mounting groove 32, and the pressure claw 6 is connected to the mounting base 52; the ball screw 53 is rotatably connected to the fixed frame, and the fixed base 51 is threadedly connected to the ball screw 53; the servo motor 54 is fixedly connected to the fixed frame, and the output shaft of the servo motor 54 is drively connected to the ball screw 53.

[0072] Specifically, the mounting bracket is fixedly installed on the workbench 1, serving as a support platform for the servo drive module 5. Two sets of guide rails are symmetrically arranged, and the mounting base 51 is slidably connected to the guide rails, allowing it to slide vertically along the guide rails. The mounting base 51 may have a horizontally arranged mounting groove 32 and a strip-shaped hole. The mounting base 52 has a protruding strip that engages with the mounting groove 32. The mounting base 52 can be fixedly connected to the mounting base 51 with bolts. The installation position of the mounting base 52 can be adjusted horizontally along the mounting groove 32. Depending on the type and specifications of the battery or welded component 9, the mounting base 52 can be fixed in an appropriate position for easy inspection.

[0073] Meanwhile, the servo motor 54 is fixed to the top of the mounting bracket, and the ball screw 53 is rotatably connected to the mounting bracket. The output shaft of the servo motor 54 can be driven to rotate the ball screw 53 via gears or a belt. The ball screw 53 passes through the mounting base 51 and is threadedly connected to it. When the servo motor 54 drives the ball screw 53 to rotate, it can drive the mounting base 51 to move vertically. This allows the pressure claw 6 to apply positive pressure to the welded part 9. By controlling the rotation state of the servo motor 54, the magnitude of the positive pressure of the pressure claw 6 can be adjusted.

[0074] Furthermore, the mounting base 52 has multiple mounting positions, each equipped with a sliding seat 55, to which the pressure claw 6 is movably connected. Before welding begins, a corresponding number of sliding seats 55 are installed on the mounting base 52 according to the number of parts 9 to be welded. Each sliding seat 55 can be slidably connected to the mounting base 52 via a slide rail or guide post, allowing for fine-tuning of the height of the pressure claw 6 and precise control of its positive pressure. Simultaneously, multiple screw holes are provided on the sliding seat 55, through which the pressure claw 6 is bolted to the sliding seat 55. These screw holes can be spaced laterally, allowing adjustment of the fixed position of the pressure claw 6 on the sliding seat 55, facilitating control of the distance between adjacent pressure claws 6 and further improving versatility.

[0075] In one embodiment of the present invention, the laser welding device for detecting the laser welding contact surface further includes: a pressure sensor disposed on the lower end face of the pressure claw 6; and a control module, wherein the pressure sensor, the servo motor 54, and the resistance tester 8 are all electrically connected to the control module.

[0076] For example, the pressure sensor can detect the positive pressure of the pressure claw 6 in real time, which facilitates real-time control of the rotation state of the servo motor 54 and helps to improve the accuracy of contact resistance detection. During detection, the pressure sensor transmits the detection data to the control module, which controls the rotation state of the servo motor 54. The resistance tester 8 transmits the detection results to the control module, which can determine the quality of the contact of the welded part 9 based on the detection results and trigger an alarm or welding operation based on the determination results.

[0077] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such 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. A laser welding device for detecting a laser welding contact surface, comprising a conveying module (2), a battery carrying module (3) slidingly connected to the conveying module (2), and a laser welding module (4) arranged above the conveying module (2), characterized in that, The laser welding device for detecting the laser welding contact surface further comprises: A servo drive module (5) is arranged on one side of the conveying end of the conveying module (2); A pressing jaw (6) is connected to the servo drive module (5), and at least two of the pressing jaws (6) are transversely spaced apart, and a wire (61) is connected to each of the two pressing jaws (6); A welding contact block (7) is arranged below the welding member (9); An electric resistance tester (8) is electrically connected to the welding contact block (7); The battery carrying module (3) is provided with a clamp assembly (34), one end of the conveying module (2) is an operating station, and the laser welding module (4) and the pressing jaw (6) are both located directly above the operating station; In the operating station, the welding member (9) is conveyed from the battery carrying module (3) to the operating station, and positioning, detection, and welding procedures are sequentially performed in the operating station; In the detection procedure, the servo drive module (5) drives the pressing jaw (6) to move vertically and press the welding member (9) to form a closed loop, and the electric resistance tester (8) is used to measure the contact resistance of the welding member (9) and determine the contact quality accordingly; in the welding procedure, the pressing jaw (6) continues to press and position the welding member (9), and the laser welding module (4) welds the welding member (9).

2. The laser welding apparatus for detecting a laser welding contact surface according to claim 1, wherein The welding member (9) comprises two cell tabs (91) of a battery and PCM plate contacts (92) arranged on the two cell tabs (91), respectively.

3. The laser welding apparatus for detecting a laser welding contact surface according to claim 2, characterized by The end of the pressing jaw (6) and the welding contact block (7) are both gold-plated copper blocks.

4. The laser welding apparatus for detecting a laser welding contact surface according to claim 1, wherein Further comprising a workbench (1), the conveying module (2) is fixed to the workbench (1), and the conveying module (2) comprises: A conveying track (21) is fixed to the workbench (1), and a sliding block is slidably connected to the conveying track (21); A conveying carrier (22) is fixedly connected to the sliding block, and the battery carrying module (3) is arranged on the conveying carrier (22); A driving member (23) is connected to the conveying carrier (22) and used to drive the conveying carrier (22) to slide on the conveying track (21).

5. The laser welding apparatus for detecting a laser welding contact surface according to claim 4, wherein The battery carrying module (3) comprises: A carrying seat (31) is fixed to the conveying carrier (22), and an installation groove (32) is formed in the carrying seat (31), and the welding contact block (7) is embedded in the bottom of the installation groove (32); A protection plate (33) is arranged on one side of the installation groove (32), and the protection plate (33) is an insulating plate; The clamp assembly (34) is arranged on the carrying seat (31) and used to clamp and position the welding member (9).

6. The laser welding apparatus for detecting a laser welding contact surface according to claim 5, wherein The clamp assembly (34) comprises: A first positioning block (341) is slidably connected to the carrying seat (31) through a first guide rod (342); A second positioning block (343) is slidably connected to the carrying seat (31) through a second guide rod (344), and the first positioning block (341) and the second positioning block (343) are perpendicular to each other and located on the two adjacent sides of the installation groove (32), respectively. A sliding block (345) is fixedly connected to the first positioning block (341), and one side of the sliding block (345) is provided with an inclined block (3451); A driven block (346) is fixedly connected to the second positioning block (343), an end of the driven block (346) is provided with a slope, the slope is parallel to the slope edge of the inclined block (3451), and the side of the driven block (346) provided with the slope is rotatably connected with a roller (3461), and the roller (3461) abuts against the slope edge of the inclined block (3451); A gas cylinder (347) is fixed to the conveying carrier (22), and the telescopic end of the gas cylinder (347) is connected to the sliding block (345).

7. The laser welding apparatus for detecting a laser welding contact surface according to claim 4, wherein The servo drive module (5) comprises: A fixed frame is fixed to the workbench (1), and one side of the fixed frame towards the conveying module (2) is fixedly connected with a vertically arranged guide rail; A fixed seat (51) is slidingly connected to the guide rail, and the fixed seat (51) is provided with a transversely arranged mounting groove (32); An installation seat (52) is movably connected to the fixed seat (51) through the mounting groove (32), and the pressing jaw (6) is connected to the installation seat (52); A ball screw (53) is rotatably connected to the fixed frame, and the fixed seat (51) is threadedly connected with the ball screw (53); A servo motor (54) is fixedly connected to the fixed frame, and the output shaft of the servo motor (54) is drivingly connected with the ball screw (53).

8. The laser welding apparatus for detecting a laser welding contact surface according to claim 7, wherein A plurality of installation stations are reserved on the installation seat (52), and a sliding seat (55) is arranged on each installation station, and the pressing jaw (6) is movably connected to the sliding seat (55).

9. The laser welding apparatus for detecting a laser welding contact surface according to claim 7, wherein Further comprising: A pressure sensor is arranged on the lower end surface of the pressing jaw (6); A control module, the pressure sensor, the servo motor (54) and the resistance tester (8) are electrically connected with the control module.

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