Lithium battery tab welding quality detection equipment and nondestructive detection method

Abstract

The invention relates to the technical field of lithium battery tab welding quality detection equipment, in particular to lithium battery tab welding quality detection equipment and a nondestructive detection method. According to the technical scheme, the lithium battery detection device comprises a rack and further comprises a conveying device mounted on the rack, a plurality of mounting plates used for mounting lithium batteries are mounted on the conveying device, the conveying device drives the mounting plates to synchronously move in a reciprocating and circulating mode, the first supporting frame and the second supporting frame are mounted on the rack, and a 3D line laser camera is fixedly mounted on the first supporting frame; a 2D camera is installed on the second supporting frame, a sliding assembly is installed on the second supporting frame, and the sliding assembly controls the 2D camera and the installation plate to move synchronously. According to the invention, the fundamental contradiction that 2D detection requires static motion and 3D detection requires uniform motion on a single assembly line is solved, efficient seamless integration of two detection technologies is realized, respective advantages of 2D vision and 3D vision are fully exerted, and omnibearing nondestructive detection of the appearance and internal three-dimensional quality of the welding spot is realized.

Description

Technical Field

[0001] This invention relates to the technical field of lithium battery tab welding quality inspection equipment, and in particular to a lithium battery tab welding quality inspection equipment and non-destructive testing method. Background Technology

[0002] In the intelligent manufacturing process of lithium batteries, the welding quality of the tabs and busbars is a critical factor determining the battery's internal resistance, power characteristics, and safety performance. Traditional inspection methods, such as manual visual inspection or single 2D vision inspection, are insufficient to comprehensively assess the quality of the welding points. While 2D vision technology can efficiently detect macroscopic surface defects in welding points, its fundamental nature is based on planar imaging and cannot acquire three-dimensional information such as the height and flatness of the welding points. Therefore, it is powerless to detect highly hazardous internal and three-dimensional defects such as cold solder joints and over-soldering. To overcome this limitation, 3D line laser contour scanning technology has been introduced. Through the principle of laser triangulation, it can accurately reconstruct the three-dimensional morphology of the welding points during the uniform movement of the battery, thereby achieving non-destructive quantitative inspection of welding depth and volume. Therefore, combining 2D and 3D vision systems constitutes the most comprehensive and reliable non-destructive inspection solution for tab welding quality currently available.

[0003] To achieve comprehensive inspection and improve overall efficiency on high-speed production lines, a natural solution is to integrate 2D and 3D cameras on the same production line, allowing battery-loaded fixtures to pass sequentially through two inspection stations along a linear track. However, this integration faces an engineering contradiction stemming from the fundamental difference in their working principles: 2D visual inspection requires the camera to remain absolutely stationary with the battery under test at the moment of exposure to capture a clear image without motion blur; while 3D line laser inspection requires the battery to move continuously and at a constant speed relative to the laser camera during scanning to complete the stitching of 3D contour data. This contradiction is particularly prominent in layouts that use a single horizontal moving mechanism to simultaneously carry and synchronously drive multiple battery fixtures. Because in this architecture, all fixtures move synchronously as a rigid whole, the system cannot simultaneously allow a battery on one fixture to stop for 2D imaging while another battery positioned under the 3D camera maintains a constant speed. If the entire production line is paused for 2D imaging, the continuous motion required for 3D scanning is disrupted, leading to point cloud data distortion or acquisition interruption. Conversely, if the entire production line is kept running at a constant speed to ensure 3D scanning, the 2D image will inevitably become blurred due to motion, severely affecting detection accuracy. When efficiently and accurately integrating 2D and 3D vision inspection technologies on a single production line, the core technological bottlenecks must be directly addressed and resolved. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a lithium battery tab welding quality inspection equipment and non-destructive testing method that integrates 2D and 3D vision inspection technologies on a single production line with high efficiency and high precision.

[0005] On one hand, this invention proposes a lithium battery tab welding quality inspection device, including a frame, and further comprising: A conveyor device mounted on a frame is provided, on which multiple mounting plates for mounting lithium batteries are installed. The conveyor device drives the multiple mounting plates to move synchronously back and forth in a cyclical manner. A first support frame and a second support frame are mounted on a rack. A 3D line laser camera is fixedly mounted on the first support frame, and a 2D camera is mounted on the second support frame. A sliding assembly is mounted on the second support frame, which controls the 2D camera to move synchronously with the mounting plate. A push rod assembly is mounted on the mounting plate, which drives the sliding assembly to move synchronously with the mounting plate after contacting the sliding assembly.

[0006] Optionally, the conveying device includes two first guide seats and a second guide seat fixedly installed on both sides of the frame. Multiple first slide rods are slidably installed on the two first guide seats. Connecting blocks are fixedly installed on the first slide rods. The connecting blocks correspond one-to-one with the mounting plate and are fixedly connected. Guide blocks are fixedly installed on both sides of the mounting plate. The guide blocks are slidably connected to the second guide seats.

[0007] Optionally, a power assembly is installed on the frame, which drives multiple first slide rods to move along the first guide seat. The power assembly includes a motor fixedly installed on the frame and two sets of pulleys rotatably installed on the frame. A transmission belt is installed on the same set of pulleys, and the pulleys on both sides are fixedly connected by a transmission shaft. The output shaft of the motor is coaxially fixedly connected to the transmission shaft.

[0008] Optionally, the first support frame includes a first horizontal plate fixedly mounted on the frame, a first guide shaft slidably mounted on the first horizontal plate, a first connecting plate fixedly mounted on the first guide shaft, a first lead screw threadedly connected to the first horizontal plate, the other end of the first lead screw being rotatably connected to the first connecting plate, and the 3D line laser camera being fixedly connected to the first connecting plate.

[0009] Optionally, the second support frame includes two second horizontal plates fixedly installed on the frame, the sliding assembly includes slide rails fixedly installed on the second horizontal plates, a sliding plate slidably installed in the two slide rails, a first spring fixedly installed between both ends of the sliding plate and the end face of the slide rail, and a lifting assembly installed on the sliding plate.

[0010] Optionally, the lifting assembly includes a second guide shaft slidably mounted on a sliding plate and a second connecting plate fixedly mounted on the second guide shaft. A second lead screw is threadedly connected to the sliding plate, and the other end of the second lead screw is rotatably connected to the second connecting plate. The 2D camera is fixedly connected to the second connecting plate.

[0011] Optionally, the push rod assembly includes a drive rod rotatably mounted on a mounting plate, a second spring being fixedly mounted between one end of the drive rod and the mounting plate, and a roller being rotatably mounted on the drive rod.

[0012] Optionally, a reset buffer assembly is installed on the second horizontal plate. The reset buffer assembly includes two rotating rods rotatably mounted on the second horizontal plate. A third spring is fixedly installed at one end of each of the two rotating rods. A connecting seat is fixedly mounted on the sliding plate, and a resistance wheel is rotatably mounted on the connecting seat.

[0013] Optionally, the mounting plate is provided with multiple sliding grooves, and a positioning block is slidably installed in the sliding groove. The positioning block is threadedly connected with a top bolt.

[0014] On the other hand, this valve proposes a non-destructive testing method for the welding quality of lithium battery tabs, applied to the aforementioned lithium battery tab welding quality testing equipment, including the following steps: Step 1: The power unit drives all the mounting plates to start circulating on the conveyor. The operator loads the lithium batteries to be tested onto the mounting plates that have moved to the loading and unloading station in sequence. Step 2: Under the drive of the conveying device, the mounting plate carrying the battery passes through the 3D inspection station under the first support frame at a constant speed. The fixed 3D line laser camera continuously scans the battery tab solder joints that pass through at a constant speed, obtains the complete three-dimensional contour point cloud data of the solder joints, and calculates the height, flatness, and coplanarity of the solder joints to identify three-dimensional defects such as cold solder joints and over-soldering. Step 3: After the 3D scan is completed, the battery continues to move with the mounting plate to the 2D inspection station under the second support frame. The push rod assembly pushes the entire sliding plate to slide on the slide rail. At this time, the 2D camera moves synchronously with the mounting plate and the battery below. The 2D camera triggers exposure and captures a high-definition two-dimensional image of the tab solder joint without motion blur. This image is used to analyze the number, location, size of the solder joint, as well as macroscopic defects such as surface spatter and contamination. Step 4: After the 2D camera finishes taking pictures, the mounting plate continues to move forward. The push rod assembly rotates under the structural guidance of the sliding assembly, causing the roller to disengage from the sliding plate. Subsequently, the first spring, which has been stretched or compressed, releases its elasticity, driving the sliding plate to move in the opposite direction to reset. Step 5: The processing system synchronously receives data from the 3D and 2D cameras. The system software fuses and analyzes the three-dimensional morphology data and two-dimensional appearance information of the weld points, and makes a comprehensive judgment based on the preset qualified threshold. Finally, the system gives a "qualified" or "unqualified" judgment result for the electrode welding quality of each battery, and stores and records the results.

[0015] In summary, this application includes at least one of the following beneficial technical effects: This invention solves the fundamental contradiction between the requirement of static 2D inspection and the requirement of uniform motion for 3D inspection on a single production line. It achieves efficient and seamless integration of the two inspection technologies, giving full play to the respective advantages of 2D and 3D vision, and realizing all-round non-destructive inspection of the appearance and internal three-dimensional quality of weld points, which greatly improves the production cycle and overall inspection efficiency. Attached Figure Description

[0016] Figure 1 Schematic diagram of a lithium battery tab welding quality inspection device Figure 1 ; Figure 2 Schematic diagram of a lithium battery tab welding quality inspection device Figure 2 ; Figure 3 Schematic diagram of a lithium battery tab welding quality inspection device Figure 3 ; Figure 4 Schematic diagram of the conveying device Figure 1 ; Figure 5 Schematic diagram of the conveying device Figure 2 ; Figure 6 for Figure 5 A magnified view of a section at point A in the middle; Figure 7 Schematic diagram of the conveying device Figure 3 ; Figure 8 This is a schematic diagram of the push rod assembly. Figure 9 This is a schematic diagram of the second support frame; Figure 10 This is a schematic diagram of the first support frame.

[0017] Reference numerals: 1. Conveying device; 11. First guide seat; 12. Second guide seat; 13. Connecting block; 14. First slide rod; 15. Guide block; 16. Power assembly; 161. Motor; 162. Pulley; 163. Transmission belt; 164. Transmission shaft; 2. Mounting plate; 21. Slide groove; 22. Positioning block; 23. Alignment bolt; 3. First support frame; 31. First cross plate; 32. First guide shaft; 33. First connecting plate; 34. First lead screw; 4. Second support Frame; 41. Second horizontal plate; 42. Sliding assembly; 421. Slide rail; 422. Sliding plate; 423. First spring; 43. Lifting assembly; 431. Second guide shaft; 432. Second connecting plate; 433. Second lead screw; 5. 3D line laser camera; 6. 2D camera; 7. Push rod assembly; 71. Drive rod; 72. Second spring; 73. Roller; 8. Reset buffer assembly; 81. Rotating rod; 82. Third spring; 83. Connecting seat; 84. Resistance wheel; 9. Frame. Detailed Implementation

[0018] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0020] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," 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 present 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 present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] like Figures 1 to 8 As shown, this invention proposes a lithium battery tab welding quality inspection device, including a frame 9 and a conveying device 1 mounted on the frame 9. The conveying device 1 has multiple mounting plates 2 for mounting lithium batteries installed on it. The conveying device 1 drives the multiple mounting plates 2 to move synchronously back and forth in a cyclical manner. It also includes a first support frame 3 and a second support frame 4 mounted on the frame 9. A 3D line laser camera 5 is fixedly mounted on the first support frame 3, and a 2D camera 6 is mounted on the second support frame 4. The 2D camera 6 efficiently detects macroscopic surface defects of the weld joints, such as positional deviation, quantity, size, and obvious spatter or contamination. The 3D line laser camera 5 accurately reconstructs the three-dimensional morphology of the weld joints during the uniform movement of the battery, thereby achieving non-destructive quantitative inspection of the welding depth and volume. By mounting the lithium battery to be inspected on the mounting plate 2 and driving the multiple mounting plates 2 carrying the lithium batteries to move synchronously via the conveying device 1, multiple lithium batteries can pass sequentially through the 3D line laser camera 5 and the 2D camera 6 in an assembly line manner, allowing for rapid inspection of the welding quality of the lithium battery tabs.

[0024] The mounting plate 2 is provided with multiple sliding grooves 21, and positioning blocks 22 are slidably installed in the sliding grooves 21. The positioning blocks 22 are threadedly connected with top bolts 23. By loosening the top bolts 23, the pressure between the positioning blocks 22 and the sliding grooves 21 can be reduced, so that the positioning blocks 22 can move easily inside the sliding grooves 21. The position of the positioning blocks 22 can be adjusted according to the shape of different lithium batteries, so that the multiple positioning blocks 22 form a groove to accommodate the lithium battery, thus positioning and installing the lithium battery.

[0025] Furthermore, the conveying device 1 includes two first guide seats 11 and a second guide seat 12 fixedly installed on both sides of the frame 9. Multiple first slide rods 14 are slidably installed on the two first guide seats 11. Connecting blocks 13 are fixedly installed on the first slide rods 14. The connecting blocks 13 correspond one-to-one with the mounting plates 2 and are fixedly connected, so that the moving path of the connecting blocks 13 will move along the first guide seats 11, thereby limiting the moving path of the mounting plates 2, so that multiple mounting plates 2 can move in a circular motion. Guide blocks 15 are fixedly installed on both sides of the mounting plates 2. The guide blocks 15 are slidably connected to the second guide seats 12. Through the cooperation of the guide blocks 15 and the second guide seats 12, the mounting plates 2 can be prevented from rotating around the first slide rods 14 as the axis during the movement, thus ensuring the stability of the mounting plates 2 during movement.

[0026] Furthermore, a power assembly 16 is installed on the frame 9. The power assembly 16 drives multiple first slide rods 14 to move along the first guide seat 11. The power assembly 16 includes a motor 161 fixedly installed on the frame 9 and two sets of pulleys 162 rotatably installed on the frame 9. A transmission belt 163 is installed on the same set of pulleys 162. The pulleys 162 on both sides are fixedly connected by a transmission shaft 164. The output shaft of the motor 161 is coaxially fixedly connected to the transmission shaft 164. The motor 161 can drive the transmission shaft 164 to rotate. The rotating transmission shaft 164 can drive the pulleys 162 on both sides of the frame 9 to move synchronously, which can make the transmission belt 163 rotate. The rotating transmission belt 163 can drive the first slide rods 14 connected to it to move along the first guide seat 11, thereby driving multiple mounting plates 2 to move synchronously.

[0027] like Figure 10 As shown, in this embodiment, the first support frame 3 includes a first horizontal plate 31 fixedly installed on the frame 9. A first guide shaft 32 is slidably installed on the first horizontal plate 31. A first connecting plate 33 is fixedly installed on the first guide shaft 32. A first lead screw 34 is threadedly connected to the first horizontal plate 31. The other end of the first lead screw 34 is rotatably connected to the first connecting plate 33. The 3D line laser camera 5 is fixedly connected to the first connecting plate 33. By rotating the first lead screw 34 and under the action of the first guide shaft 32, the first connecting plate 33 can be raised and lowered. Thus, the height of the 3D line laser camera 5 can be adjusted by rotating the first lead screw 34. The height of the 3D line laser camera 5 can be appropriately adjusted according to the height of the lithium battery.

[0028] like Figure 8 and Figure 9As shown, in this embodiment, a sliding assembly 42 is installed on the second support frame 4. The sliding assembly 42 controls the 2D camera 6 to move synchronously with the mounting plate 2. A push rod assembly 7 is installed on the mounting plate 2. After the push rod assembly 7 contacts the sliding assembly 42, it drives the sliding assembly 42 to move synchronously with the mounting plate 2. When the mounting plate 2 moves to below the sliding assembly 42, the 2D camera 6 is driven to move on the sliding assembly 42 using the mounting plate 2 as a power source, so that the mounting plate 2 and the 2D camera 6 remain relatively stationary. This can prevent the 2D camera 6 from producing blurry images, and ensure that the 3D line laser camera 5 and the 2D camera 6 can coexist on the same detection production line without causing imaging contradictions due to differences in the requirements for the movement state of the lithium battery.

[0029] Furthermore, the second support frame 4 includes two second horizontal plates 41 fixedly installed on the frame 9. The sliding assembly 42 includes slide rails 421 fixedly installed on the second horizontal plates 41. Sliding plates 422 are slidably installed in the two slide rails 421. First springs 423 are fixedly installed between the two ends of the sliding plates 422 and the end faces of the slide rails 421. When the sliding plates 422 are pushed by the push rod assembly 7, the sliding plates 422 will slide on the slide rails 421. The sliding slide rails 421 will stretch or compress the first springs 423. When the sliding plates 422 are not pushed, they can be reset under the elastic force of the first springs 423. A lifting assembly 43 is installed on the sliding plates 422. The height of the 2D camera 6 can be adjusted by the lifting assembly 43.

[0030] The lifting assembly 43 includes a second guide shaft 431 slidably mounted on a sliding plate 422 and a second connecting plate 432 fixedly mounted on the second guide shaft 431. A second lead screw 433 is threaded onto the sliding plate 422, and the other end of the second lead screw 433 is rotatably connected to the second connecting plate 432. The 2D camera 6 is fixedly connected to the second connecting plate 432. By rotating the second lead screw 433 and under the guidance of the second guide shaft 431, the second connecting plate 432 can be driven to move up and down, thereby allowing the height of the 2D camera 6 to be adjusted appropriately to accommodate lithium batteries of different heights.

[0031] Furthermore, the push rod assembly 7 includes a drive rod 71 rotatably mounted on the mounting plate 2. A second spring 72 is fixedly installed between one end of the drive rod 71 and the mounting plate 2. A roller 73 is rotatably mounted on the drive rod 71. Under the action of the second spring 72, the drive rod 71 will remain vertical when not affected by external force. At this time, the height of the drive rod 71 is higher than that of the sliding plate 422, so it can contact the sliding plate 422. When the drive rod 71 contacts the sliding plate 422, it will push the sliding plate 422 to move. At this time, the sliding plate 422 and the mounting plate 2 can move synchronously. When the sliding plate 422 moves a certain distance, the 2D camera 6 takes a picture. Then, after the sliding plate 422 moves to the limit distance, the drive rod 71 will gradually flip under the action of resistance, so that the height of the drive rod 71 gradually decreases. Finally, the drive rod 71 is attached to the bottom surface of the sliding plate 422 and passes through the sliding plate 422. Under the action of the roller 73, the friction between the drive rod 71 and the sliding plate 422 can be reduced.

[0032] like Figure 9 As shown, in this embodiment, a reset buffer assembly 8 is installed on the second horizontal plate 41. The reset buffer assembly 8 includes two rotating rods 81 rotatably mounted on the second horizontal plate 41. A third spring 82 is fixedly installed at one end of each of the two rotating rods 81. A connecting seat 83 is fixedly mounted on the sliding plate 422. A resistance wheel 84 is rotatably mounted on the connecting seat 83. When the sliding plate 422 is reset under the action of the first spring 423, the machining will drive the resistance wheel 84 to move. The resistance wheel 84 will push the two rotating rods 81 to rotate. At this time, it is necessary to overcome the tension of the third spring 82. The rotating rods 81 form a lever. As the resistance wheel 84 moves, it will gradually approach the rotation center of the rotating rods 81. At this time, the resistance of the resistance wheel 84 will gradually increase, thereby gradually increasing the resistance of the sliding plate 422 during reset. This can prevent the sliding plate 422 from swinging back and forth during the reset process.

[0033] On the other hand, the invention proposes a non-destructive testing method for the welding quality of lithium battery tabs, applied to the above-mentioned lithium battery tab welding quality testing equipment, including the following steps: Step 1: Drive all mounting plates 2 to move cyclically on the conveyor 1 via the power component 16. The operator will then load the lithium batteries to be tested onto the mounting plates 2 that have been moved to the loading and unloading station. Step 2: Under the drive of the conveying device 1, the mounting plate 2 carrying the battery passes through the 3D detection station under the first support frame 3 at a constant speed. The fixedly installed 3D line laser camera 5 continuously scans the battery tab solder joints that pass through at a constant speed, obtains the complete three-dimensional contour point cloud data of the solder joints, and calculates the height, flatness, and coplanarity of the solder joints to identify three-dimensional defects such as cold solder joints and over-soldering. Step 3: After the 3D scan is completed, the battery continues to move with the mounting plate 2 to the 2D inspection station below the second support frame 4. The push rod assembly 7 pushes the entire sliding plate 422 to slide on the slide rail 421. At this time, the 2D camera 6 moves synchronously with the mounting plate 2 and the battery below. The 2D camera 6 triggers exposure and captures a high-definition two-dimensional image of the tab solder joint without motion blur, which is used to analyze the number, position, size of the solder joint, as well as macroscopic defects such as surface spatter and contamination. Step 4: After the 2D camera finishes shooting, the mounting plate 2 continues to move forward. The push rod assembly 7 rotates under the structural guidance of the sliding assembly 42, causing the roller 73 to disengage from the sliding plate 422. Subsequently, the first spring 423, which has been stretched or compressed, releases its elastic force, driving the sliding plate 422 to move in the opposite direction to reset. Step 5: The processing system synchronously receives data from the 3D and 2D cameras. The system software fuses and analyzes the three-dimensional morphology data and two-dimensional appearance information of the weld points, and makes a comprehensive judgment based on the preset qualified threshold. Finally, the system gives a "qualified" or "unqualified" judgment result for the electrode welding quality of each battery, and stores and records the results.

[0034] In this embodiment, 2D and 3D visual inspection, which have conflicting requirements for motion state, are integrated on a continuously operating production line. The conveying device 1 drives multiple mounting plates 2 to move synchronously and at a constant speed. The fixedly installed 3D line laser camera 5 scans the battery tab solder joints that pass by at a constant speed to obtain three-dimensional shape data. When the mounting plate moves to the 2D inspection station, the push rod assembly 7 on it contacts and pushes the sliding plate 422 of the sliding assembly 42, so that the 2D camera 6 installed on it moves synchronously with the mounting plate 2 and the battery. At this moment of relative stillness, the 2D camera 6 completes high-definition image acquisition. Then, the push rod assembly 7 disengages under mechanical action, and the sliding plate 422 is smoothly reset under the damping action of the first spring 423 and the reset buffer assembly 8, waiting for the next cycle.

[0035] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A lithium battery tab welding quality inspection device, comprising a frame (9), characterized in that, Also includes: The conveying device (1) is mounted on the frame (9), and the conveying device (1) is equipped with a plurality of mounting plates (2) for mounting lithium batteries. The conveying device (1) drives the plurality of mounting plates (2) to move synchronously back and forth in a cyclic manner. The first support frame (3) and the second support frame (4) are mounted on the frame (9). A 3D line laser camera (5) is fixedly mounted on the first support frame (3). A 2D camera (6) is mounted on the second support frame (4). A sliding assembly (42) is mounted on the second support frame (4). The sliding assembly (42) controls the 2D camera (6) to move synchronously with the mounting plate (2). A push rod assembly (7) is mounted on the mounting plate (2). After the push rod assembly (7) contacts the sliding assembly (42), it drives the sliding assembly (42) to move synchronously with the mounting plate (2).

2. The lithium battery tab welding quality inspection equipment according to claim 1, characterized in that, The conveying device (1) includes two first guide seats (11) and a second guide seat (12) fixedly installed on both sides of the frame (9). Multiple first slide rods (14) are slidably installed on the two first guide seats (11). A connecting block (13) is fixedly installed on the first slide rod (14). The connecting block (13) corresponds to and is fixedly connected to the mounting plate (2). Guide blocks (15) are fixedly installed on both sides of the mounting plate (2). The guide blocks (15) are slidably connected to the second guide seat (12).

3. The lithium battery tab welding quality inspection equipment according to claim 2, characterized in that, A power assembly (16) is installed on the frame (9). The power assembly (16) drives multiple first slide rods (14) to move along the first guide seat (11). The power assembly (16) includes a motor (161) fixedly installed on the frame (9) and two sets of pulleys (162) rotatably installed on the frame (9). A transmission belt (163) is installed on the same set of pulleys (162). The pulleys (162) on both sides are fixedly connected by a transmission shaft (164). The output shaft of the motor (161) is coaxially fixedly connected to the transmission shaft (164).

4. The lithium battery tab welding quality inspection equipment according to claim 3, characterized in that, The first support frame (3) includes a first horizontal plate (31) fixedly installed on the frame (9), a first guide shaft (32) is slidably installed on the first horizontal plate (31), a first connecting plate (33) is fixedly installed on the first guide shaft (32), a first lead screw (34) is threadedly connected to the first horizontal plate (31), the other end of the first lead screw (34) is rotatably connected to the first connecting plate (33), and the 3D line laser camera (5) is fixedly connected to the first connecting plate (33).

5. The lithium battery tab welding quality inspection equipment according to claim 4, characterized in that, The second support frame (4) includes two second horizontal plates (41) fixedly installed on the frame (9). The sliding assembly (42) includes a slide rail (421) fixedly installed on the second horizontal plate (41). A sliding plate (422) is slidably installed in the two slide rails (421). A first spring (423) is fixedly installed between the two ends of the sliding plate (422) and the end face of the slide rail (421). A lifting assembly (43) is installed on the sliding plate (422).

6. The lithium battery tab welding quality inspection equipment according to claim 5, characterized in that, The lifting assembly (43) includes a second guide shaft (431) slidably mounted on a sliding plate (422) and a second connecting plate (432) fixedly mounted on the second guide shaft (431). A second lead screw (433) is threadedly connected to the sliding plate (422). The other end of the second lead screw (433) is rotatably connected to the second connecting plate (432). The 2D camera (6) is fixedly connected to the second connecting plate (432).

7. The lithium battery tab welding quality inspection equipment according to claim 6, characterized in that, The push rod assembly (7) includes a drive rod (71) rotatably mounted on the mounting plate (2), a second spring (72) is fixedly mounted between one end of the drive rod (71) and the mounting plate (2), and a roller (73) is rotatably mounted on the drive rod (71).

8. The lithium battery tab welding quality inspection equipment according to claim 7, characterized in that, A reset buffer assembly (8) is installed on the second horizontal plate (41). The reset buffer assembly (8) includes two rotating rods (81) rotatably mounted on the second horizontal plate (41). A third spring (82) is fixedly mounted on one end of the two rotating rods (81). A connecting seat (83) is fixedly mounted on the sliding plate (422). A resistance wheel (84) is rotatably mounted on the connecting seat (83).

9. The lithium battery tab welding quality inspection equipment according to claim 8, characterized in that, The mounting plate (2) is provided with multiple sliding grooves (21), and a positioning block (22) is slidably installed in the sliding groove (21). A top bolt (23) is threadedly connected to the positioning block (22).

10. A non-destructive testing method for the welding quality of lithium battery tabs, characterized in that, The lithium battery tab welding quality inspection equipment according to claim 9 includes the following steps: Step 1: Drive all mounting plates (2) to start circulating on the conveyor (1) via the power component (16). The operator will load the lithium batteries to be tested onto the mounting plates (2) that have been moved to the loading and unloading station in sequence. Step 2: The mounting plate (2) carrying the battery passes through the 3D detection station below the first support frame (3) at a constant speed under the drive of the conveying device (1). The fixed 3D line laser camera (5) continuously scans the battery tab solder joints that pass through at a constant speed, obtains the complete three-dimensional contour point cloud data of the solder joints, and calculates the height, flatness, and coplanarity of the solder joints to identify three-dimensional defects such as poor soldering and over-soldering. Step 3: The battery that has completed the 3D scan continues to move with the mounting plate (2) to the 2D inspection station below the second support frame (4). The push rod assembly (7) pushes the entire sliding plate (422) to start sliding on the slide rail (421). At this time, the 2D camera (6) moves synchronously with the mounting plate (2) and the battery below. The 2D camera (6) triggers exposure and captures a high-definition two-dimensional image of the tab solder joint without motion blur, which is used to analyze the number, position, size of the solder joint and macroscopic defects such as surface spatter and contamination. Step 4: After the 2D camera finishes shooting, the mounting plate (2) continues to move forward, and the push rod assembly (7) rotates under the structural guidance of the sliding assembly (42), causing the roller (73) to disengage from the sliding plate (422). Subsequently, the first spring (423), which has been stretched or compressed, releases its elastic force, driving the sliding plate (422) to move in the opposite direction to reset. Step 5: The processing system synchronously receives data from the 3D and 2D cameras. The system software fuses and analyzes the three-dimensional morphology data and two-dimensional appearance information of the weld points, and makes a comprehensive judgment based on the preset qualified threshold. Finally, the system gives a "qualified" or "unqualified" judgment result for the electrode welding quality of each battery, and stores and records the results.

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