A battery blue film appearance defect detection device

Abstract

The utility model relates to a kind of battery blue film appearance defect detection device, including external pull belt and AOI detection machine;External pull belt includes feeding butt joint pull belt, OK belt line, NG belt line, re-investment belt line and discharging butt joint pull belt;AOI detection machine is set to the side of OK belt line;AOI detection machine includes feeding handling module, bottom surface detection vision module, narrow surface detection vision module, large surface and top surface detection vision module, double-motor handling module, ring line detection module, rotating variable pitch module, OK discharging handling module and NG discharging handling module.The utility model uses deep learning, 2.5D line scanning imaging technology, annular detection module and automatic conveying system, solves the difficulty of bubble foreign matter detection and distinction that square battery package blue film process faces, can be connected to the good product flow channel of front package blue film equipment, and after sorting machine and Pack line process, realize the automation of square lithium battery package film post production line.

Description

Technical Field

[0001] This utility model relates to the field of visual inspection technology, and in particular to a device for detecting appearance defects in the blue film of a battery. Background Technology

[0002] Currently, square batteries are coated with a blue film during production to provide insulation, waterproofing, and aesthetics. However, after coating, some batteries develop defects in the blue film, such as bubbles, electrolyte residue, foreign matter, wrinkles, dents, scratches, and damage, which affect the normal use of the battery. Therefore, it is necessary to inspect for these defects before and after coating the battery with the blue film.

[0003] Current methods for inspecting the appearance of the blue film on batteries typically involve manual inspection or automated machine inspection.

[0004] Manual inspection typically relies on high-precision cameras to magnify the surface features of the battery's blue film on a display screen, with manual judgment of the quality of the feature points. Therefore, the existing manual inspection method requires a lot of manpower and time, with an average inspection time of about 18 seconds per battery. It requires manual flipping of the square battery one side at a time for appearance inspection, resulting in low inspection efficiency and the possibility of false detections or missed detections due to subjective factors such as visual fatigue.

[0005] Existing automated inspection systems typically consist of a frame, outer casing, loading and handling module, linear motor inspection module, dual-movement handling module, vision module, loop inspection, conveyor line, rack and pinion traverse module, electrical box, and controller. 1) Loading and connecting conveyor line: Connects to the belt conveyor after coating or manually loads the battery; 2) Loading and handling module: Grabs the battery and performs bottom inspection, placing it onto the large-area inspection fixture; 3) Linear motor inspection module: Positions the product and performs large-area appearance inspection; 4) Dual-movement handling module: Mover one grabs the product and places it onto the variable-pitch rotation module; after variable-pitch rotation, mover two grabs the product and places it onto the loop fixture; 5) Vision component: Takes pictures of the battery to obtain its features and transmits them to the controller for analysis; 7) Unloading mechanism: Grabs the battery and, based on the inspection results, places it into the OK or NG unloading conveyor line. Therefore, existing automated machine detection methods, from a technical perspective, cannot distinguish between air bubbles on the membrane surface and foreign objects inside the membrane, leading to frequent false detections. This is because they typically use a single camera for detection, and single-sided imaging makes accurate judgments difficult. Furthermore, existing automated machine detection methods suffer from poor product compatibility. Domestic development of camera algorithms and logic is lacking; they rely solely on the camera's internal algorithms. This inherent approach is only applicable to a single battery product, requiring the camera to be replaced when the battery model is changed. Utility Model Content

[0006] The technical problem this utility model aims to solve is to provide a battery blue film appearance defect detection device. This device employs deep learning, 2.5D line scan imaging technology, a ring detection module, and an automatic conveying system. It addresses the difficulties in detecting and distinguishing air bubbles and foreign objects in the blue film process of square battery packs. It can be integrated with the good product flow channel of the front-end blue film packing equipment, as well as the rear-end sorting machine and pack line processes, achieving automated connection of the square lithium battery pack production line. Furthermore, it addresses the technical problem of detecting the appearance of different models of square batteries using a 2.5D line scan camera, an area scan camera, and a 3D camera, and utilizes automation technology to detect products of different specifications, thus improving detection efficiency.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a battery blue film appearance defect detection device, including an external pull belt and an AOI inspection machine; the external pull belt includes a feeding docking pull belt, an OK belt line, an NG belt line, a refill belt line and a discharging docking pull belt; the feeding docking pull belt and the discharging docking pull belt are respectively set at both ends of the OK belt line, and the NG belt line and the refill belt line are set parallel between the feeding docking pull belt and the discharging docking pull belt and perpendicular to the OK belt line;

[0008] The AOI inspection machine is located to the side of the OK conveyor belt. The AOI inspection machine includes a loading and handling module, a bottom surface inspection vision module, a narrow surface inspection vision module, a large surface and top surface inspection vision module, a dual-movement handling module, a loop inspection module, a rotary pitch module, an OK unloading and handling module, and an NG unloading and handling module. The loading and handling module loads and handles the products, which are then inspected sequentially by the bottom surface inspection vision module and the narrow surface inspection vision module. After the bottom and narrow surface inspections, the products are transported by the dual-movement handling module to the rotary pitch module, rotated 90°, and then transported again to the loop inspection module for large surface and top surface inspection by the large surface and top surface inspection vision module. Finally, the products are unloaded by either the OK unloading and handling module or the NG unloading and handling module.

[0009] Furthermore, the top surface inspection of this utility model includes three areas: the electrode post, the explosion-proof valve, and the top patch. The explosion-proof valve area is illuminated by an area scan camera with coaxial light and four-zone ring light, and a synthetic image is generated using an algorithm to detect electrolyte, scratches, and missing explosion-proof valve defects on the PP film surface. The front area of ​​the electrode post is illuminated by coaxial + zone ring light to generate multiple images sequentially, detecting scratches and electrolyte defects on the electrode post surface. The sidewall area of ​​the electrode post is photographed by an area scan camera with strip light to detect scratches, damage, and electrolyte crystallization defects in the sidewall. The top patch area is photographed by a line scan camera with a coaxial light source and a 3D camera to detect patch damage, missing patch, and patch warping defects.

[0010] The large-area inspection uses the same inspection method as the bottom surface to inspect defects in two large-area areas respectively, and the large-area flatness defects are inspected separately by adding a 3D camera to the large-area.

[0011] Furthermore, the material handling module of this utility model includes a Y-axis linear motor, and a Z-axis lead screw module is provided on the Y-axis linear motor; the Z-axis lead screw module is connected to a self-locking gripper, and the self-locking gripper is provided with photoelectric sensors.

[0012] Furthermore, the bottom surface detection vision module of this utility model includes a first and a second bottom surface line scan camera and a first and a second bottom surface line scan light source; the first and the second bottom surface line scan light sources are respectively arranged above the first and the second bottom surface line scan cameras, and the first and the second bottom surface line scan cameras are symmetrically arranged.

[0013] Furthermore, the AOI inspection machine of this utility model also includes a linear motor module; the linear motor module includes a linear motor, the linear motor is provided with a rubber-coated gripper, and the end face and side face of the rubber-coated gripper are respectively provided with a large-face positioning cylinder assembly and a narrow-face positioning cylinder assembly.

[0014] Furthermore, the narrow-face detection vision module of this utility model includes two first narrow-face 2.5D light sources, two second narrow-face 2.5D light sources, and first and second narrow-face 2.5D line scan cameras; the two first narrow-face 2.5D light sources and the two second narrow-face 2.5D light sources are arranged in a ring matrix, and the first and second narrow-face 2.5D line scan cameras are disposed on the sides of the two first narrow-face 2.5D light sources and the two second narrow-face 2.5D light sources.

[0015] Furthermore, the dual-moving-element transport module of this utility model includes a first moving element and a second moving element; the first moving element is connected to a Z-axis lead screw module, and the Z-axis lead screw module is connected to a gripper cylinder; the second moving element is connected to a Z-axis cylinder.

[0016] Furthermore, the top surface and large surface inspection vision module of this utility model includes two symmetrically arranged first line scan cameras and two symmetrically arranged second line scan cameras; the top surface and large surface inspection vision module inspects the poles, explosion-proof valves and top patch areas of the product.

[0017] Furthermore, the NG unloading and handling module of this utility model includes a conveyor belt, and the side of the conveyor belt is provided with a guide wheel that is in close contact with the product.

[0018] Furthermore, the present invention features: the OK belt conveyor has an anti-static belt; and the OK belt conveyor, NG belt conveyor, and re-injection belt conveyor are all equipped with rubber-coated bearings.

[0019] The beneficial effect of this utility model is that it solves the defects existing in the background technology.

[0020] To address the issues of low efficiency, missed detections, and false detections associated with manual inspection, this utility model employs: 1) Automatic feeding, consisting of a feeding belt conveyor and a gripping mechanism, which can be integrated with upstream processes; when used as a standalone machine, it has a separate start button, allowing manual feeding onto the feeding belt conveyor, making it multi-functional; then, a gripping robot retrieves the material from the conveyor and places it on the intermediate feeding line; 2) Automatic inspection station, where a transport mechanism clamps the product and moves it, inspecting the product during the movement; 3) Photo-taking station, which judges the incoming material based on signals, automatically takes photos to acquire and analyze the inspection surface features, and uploads OK / NG data; 4) Automatic unloading, consisting of an OK unloading belt conveyor, an NG unloading belt conveyor, and an unloading mechanism, which can be integrated with downstream processes or manually collected. The introduction of this fully automatic inspection machine has promoted the development of the entire new energy and battery blue film inspection industry, solving the problems of low inspection efficiency, high labor costs, and false and missed detections.

[0021] To address the issue of false detection in existing automated machine detection methods, this invention combines a 2.5D imaging line array camera, an area array camera, and a 3D camera system. By using two different cameras to photograph the product surface, two visual images are generated for comparative analysis, thereby enabling rapid differentiation between bubbles on the membrane surface and foreign matter inside the membrane, reducing false detections, and effectively improving the yield rate.

[0022] To address the issue of poor compatibility in existing automated machine testing methods, this invention combines AI with traditional algorithms and utilizes independently developed modules. Based on different customer samples, it can quickly expand compatibility through learning and training, enabling production to commence within 3 days and significantly improving equipment utilization. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a top view of the external pull strap of this utility model;

[0025] Figure 3 This is a top view of the AOI inspection machine of this utility model;

[0026] Figure 4 Automated Inspection Flow Diagram of the AOI Inspection Machine of This Utility Model;

[0027] Figure 5 Axonometric drawing of the AOI inspection machine of this utility model;

[0028] Figure 6 Another perspective isometric view of the AOI inspection machine of this utility model;

[0029] Figure 7Schematic diagram of the material handling module structure of this utility model;

[0030] Figure 8 Schematic diagram of the bottom surface detection vision module of this utility model;

[0031] Figure 9 Schematic diagram of the linear motor module structure of this utility model;

[0032] Figure 10 A schematic diagram of the narrow-face visual inspection module of this utility model;

[0033] Figure 11 Schematic diagram of the structure of the dual-moving transport module of this utility model;

[0034] Figure 12 Schematic diagram of the top and large surface detection vision module structure of this utility model;

[0035] Figure 13 Schematic diagram of the OK unloading and handling module of this utility model;

[0036] Figure 14 Schematic diagram of the NG unloading and handling module of this utility model;

[0037] Figure 15 Schematic diagram of the feeding docking belt structure of this utility model;

[0038] Figure 16 Schematic diagram of the OK belt conveyor structure of this utility model;

[0039] Figure 17 Schematic diagram of the NG belt conveyor and re-injection belt conveyor of this utility model;

[0040] In the image: 1. External pull strap; 2. AOI inspection machine; 3. Product;

[0041] 11. Feeding conveyor belt; 12. OK conveyor belt; 13. NG conveyor belt; 14. Re-feeding conveyor belt; 15. Unloading conveyor belt; 16. Anti-static conveyor belt; 17. Rubber-coated bearing;

[0042] 21. Material handling module; 22. Bottom surface inspection vision module; 23. Narrow surface inspection vision module; 24. Large surface and top surface inspection vision module; 25. Dual-actuator handling module; 26. Circular inspection module; 27. Rotary variable pitch module; 28. OK unloading and handling module; 29. ​​NG unloading and handling module; 210. Linear motor module;

[0043] 211. Y-axis linear motor; 212. Z-axis lead screw module; 213. Self-locking gripper; 214. Photoelectric sensor;

[0044] 221. First bottom surface line scan camera; 222. Second bottom surface line scan camera; 223. First bottom surface line scan light source; 224. Second bottom surface line scan light source;

[0045] 231. First narrow-plane 2.5D light source; 232. Second narrow-plane 2.5D light source; 233. First narrow-plane 2.5D line scan camera; 234. Second narrow-plane 2.5D line scan camera;

[0046] 241. First line scan camera; 242. Second line scan camera; 243. Terminal inspection station; 244. Terminal sidewall inspection station; 245. Explosion-proof valve inspection station; 246. Top patch inspection station;

[0047] 251. First moving part; 252. Second moving part; 253. Z-axis lead screw module; 254. Gripper cylinder; 255. Z-axis cylinder;

[0048] 291. Conveyor belt; 292. Guide wheel;

[0049] 2101. Linear motor; 2102. Rubber-coated gripper; 2103. Large-face positioning cylinder assembly; 2104. Narrow-face positioning cylinder assembly. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0051] like Figures 1-17 The device shown is a battery blue film appearance defect detection device, which is an automated inspection equipment production line for loading, positioning, blue film detection and unloading of multiple models of square blue film batteries.

[0052] like Figure 1 As shown, the device includes an external pull strap 1 and an AOI inspection machine 2; Figure 2 As shown, the external conveyor belt 1 includes a feeding docking conveyor belt 11, an OK conveyor belt 12, an NG conveyor belt 13, a refill conveyor belt 14, and a discharging docking conveyor belt 15; the feeding docking conveyor belt 11 and the discharging docking conveyor belt 15 are respectively disposed at both ends of the OK conveyor belt 12, and the NG conveyor belt 13 and the refill conveyor belt 14 are disposed parallel to the feeding docking conveyor belt 11 and the discharging docking conveyor belt 12 and are perpendicular to the OK conveyor belt 12;

[0053] AOI inspection machine 2 is positioned to the side of the OK conveyor belt; such as Figures 3-6As shown, the AOI inspection machine 2 includes a loading and handling module 21, a bottom surface inspection vision module 22, a narrow surface inspection vision module 23, a large surface and top surface inspection vision module 24, a dual-movement handling module 25, a loop inspection module 26, a rotary variable pitch module 27, an OK unloading and handling module 28, and an NG unloading and handling module 29. The loading and handling module 21 loads and handles the product 3, which is then inspected sequentially by the bottom surface inspection vision module 22 and the narrow surface inspection vision module 23. After the bottom and narrow surface inspections, the product is transported by the dual-movement handling module 25 to the rotary variable pitch module 27, where it is rotated 90° and then transported again to the loop inspection module 26 for inspection of the large surface and top surface by the large surface and top surface inspection vision module 24. Finally, the product is unloaded by either the OK unloading and handling module or the NG unloading and handling module.

[0054] The top surface inspection includes three areas: the electrode post, the explosion-proof valve, and the top patch. The explosion-proof valve area is illuminated by a planar array camera with coaxial light and four-zone ring light, and a composite image is generated using an algorithm to detect electrolyte, scratches, and missing explosion-proof valve defects on the PP film surface. The front area of ​​the electrode post is illuminated by coaxial and zoned ring light at different times to generate multiple images, detecting scratches and electrolyte defects on the electrode post surface. The sidewall area of ​​the electrode post is photographed by a planar array camera with strip light to detect scratches, damage, and electrolyte crystallization defects in the sidewall. The top patch area is photographed by a line scan camera with a coaxial light source and a 3D camera to detect patch damage, missing patch, and patch warping defects.

[0055] The large-area inspection uses the same inspection method as the bottom surface to inspect defects in the two large-area areas separately, and the large-area flatness defects are inspected separately by adding a 3D camera to the large-area.

[0056] like Figure 7 As shown, the material handling module 21 includes a Y-axis linear motor 211, on which a Z-axis lead screw module 212 is mounted; the Z-axis lead screw module 212 is connected to a self-locking gripper 213, and the self-locking gripper 213 is equipped with a photoelectric sensor 214. The structure of the self-locking gripper 213 is existing technology and will not be described in detail here.

[0057] like Figure 8 As shown, the bottom surface detection vision module 22 includes first and second bottom surface line scan cameras 221 and 222, and first and second bottom surface line scan light sources 223 and 224; the first and second bottom surface line scan light sources are respectively arranged above the first and second bottom surface line scan cameras, and the first and second bottom surface line scan cameras are symmetrically arranged.

[0058] like Figure 9As shown, the AOI inspection machine 2 also includes a linear motor module 210; the linear motor module includes a linear motor 2101, and a rubber-coated gripper 2102 is provided on the sliding end of the linear motor 2101. The end face and side face of the rubber-coated gripper 2102 are respectively provided with a large-face positioning cylinder assembly 2103 and a narrow-face positioning cylinder assembly 2104.

[0059] like Figure 10 As shown, the narrow face detection vision module 23 includes two first narrow face 2.5D light sources 231, two second narrow face 2.5D light sources 232, and first and second narrow face 2.5D line scan cameras 233 and 234; the two first narrow face 2.5D light sources and the two second narrow face 2.5D light sources are arranged in a ring matrix, and the first and second narrow face 2.5D line scan cameras are disposed on the sides of the two first narrow face 2.5D light sources and the two second narrow face 2.5D light sources.

[0060] like Figure 11 As shown, the dual-moving-electrode handling module 25 includes a first moving part 251 and a second moving part 252; the first moving part is connected to a Z-axis lead screw module 253, which is connected to a gripper cylinder 254; the second moving part is connected to a Z-axis cylinder 255. The structure of the rotary pitch module 27 has been disclosed in a prior patent application by the same applicant and will not be described in detail here.

[0061] like Figure 12 As shown, the top surface and large surface inspection vision module 24 includes two symmetrically arranged first line scan cameras 241 and two symmetrically arranged second line scan cameras 242; the top surface and large surface inspection vision module performs inspections on the corresponding pole, explosion-proof valve and top patch areas of the product at the pole inspection station 243, pole sidewall inspection station 244, explosion-proof valve inspection station 245 and top patch inspection station 246 respectively.

[0062] like Figure 14 As shown, the NG unloading and handling 29 includes a conveyor belt 291, and a guide wheel 292 that is in close contact with the product is provided on the side of the conveyor belt 291. The product 3 is conveyed on the conveyor belt 291, and the guide wheel 292 provides stable support for the product 3 from the side.

[0063] like Figure 16 As shown, the OK belt conveyor 12 has an anti-static belt 16; the OK belt conveyor, NG belt conveyor and re-injection belt conveyor are all equipped with rubber-coated bearings 17.

[0064] Explanation of the principle:

[0065] 1) Vision Principle: Vision guidance generally consists of an industrial camera, lens, light source, and controller. The industrial camera and light source are perpendicular to the surface of the product to be inspected at 90° to take pictures of the material to be inspected. Then, the pictures are compared with the calibration images. The differences produced by the comparison are the abnormal features detected. The calibration images are used to determine which type of NG product this feature belongs to, and the detection data is uploaded to the system.

[0066] 2) 3-axis linkage principle: 4-axis linkage refers to a device having at least four coordinate axes (three linear coordinate systems and one rotary coordinate system) that can move simultaneously and coordinately under the control of a computer PLC system. In this invention, when gripping a product, the X, Y, and Z axes are linked. Based on the calibrated points, the PLC controls the handling robot to move to the product position and grip the product, placing it into the lowering station.

[0067] The process flow for each work section is described below:

[0068] The feeding machine includes a merging feeding station and a feeding and conveying mechanism;

[0069] Convergence feeding station: The transfer components are received from the conveyor belt and transferred to the AOI conveyor belt;

[0070] Material handling mechanism: 1. The gripper simultaneously removes 4 PCS products from the conveyor line; 2. The material handling module descends to pick up the material, moves laterally to perform bottom surface inspection, and places the product on the narrow surface inspection fixture.

[0071] AOI inspection machine includes bottom surface inspection, narrow surface inspection linear motor, narrow surface inspection vision module, double-acting linear motor for handling, rotary torque conversion mechanism, loop module, large surface & top surface inspection vision module, OK unloading and handling module, NG unloading and handling module;

[0072] Bottom surface inspection: Perform visual inspection on the bottom surface of the battery;

[0073] Narrow surface detection linear motor: Narrow surface detection transverse linear motor, the linear motor moves to perform narrow surface detection;

[0074] Narrow-face inspection vision module: performs appearance inspection on the narrow face of the battery;

[0075] Dual-motor linear motor conveying system: Linear motor motor one picks up material from the narrow-faced inspection fixture and places it at the rotary pitch-changing station. Linear motor motor two picks up material from the rotary station and places it at the loading position on the circular line.

[0076] Rotary pitch mechanism: Two products are grouped together, with a gap between the two groups, and the products rotate 90°.

[0077] Ring module: The battery is placed in the ring fixture, two products are grouped together, and the two products move in a ring once, and vision is used for inspection;

[0078] Large and Top Surface Inspection Vision Module: Performs visual inspection on the large and top surfaces of the battery;

[0079] OK unloading and handling module: The handling module picks up OK products from the loop line and places them on the OK flow channel;

[0080] NG unloading and handling module: The handling module picks up NG products from the loop and places them on the NG flow channel.

[0081] External conveyor belts include NG unloading conveyor belts, straight conveyor belts, refill conveyor belts, refill handling modules, and merging discharge stations;

[0082] NG unloading conveyor belt: After NG products are placed on the unloading conveyor belt, they are manually removed from the end of the NG belt.

[0083] Straight-through conveyor belt: When the equipment stops, the product is directly conveyed from the conveyor belt to the downstream equipment;

[0084] Reprocessing conveyor belt: NG products are manually removed from the end of the NG conveyor belt and placed onto the reprocessing conveyor belt;

[0085] Re-feeding and handling module: The re-feeding and handling module picks up materials from the re-feeding conveyor belt using gripper cylinders and places them onto the OK conveyor belt;

[0086] Convergence discharge station: The transfer assembly receives material from the OK conveyor belt and transfers it to the sorting machine.

[0087] Action / Step Description:

[0088] Feeding and connecting pull belt module

[0089] Step 1, Material Incoming: The employee / upstream process places 4 products onto the gear and rack transverse module. The conveyor belt runs, the photoelectric sensor detects the products, and the conveyor belt stops when it reaches the correct position. The gear and rack move to the loading port, the blocking cylinder descends, and the products flow out. After the photoelectric sensor detects the products, the barcode scanner scans them. The conveyor belt starts, and the belt stops rotating when the products reach the loading position.

[0090] Step 2, Loading: The loading and handling module moves downwards to pick up 4 products. During the handling process, bottom surface inspection is performed. The bottom surface station uses a line scan camera, equipped with a 2.5D light source and an infrared light source, to capture bottom surface images. From the 2.5D image, a composite image is generated using stripe image processing. Defects such as bubbles, scratches, and wrinkles are detected in the composite image. The bubble defect areas detected in the composite image are mapped onto the infrared image. Edge defects are detected in the infrared image, and the bubble areas in the composite image are obtained. An AI model is used to identify bubbles, soft foreign objects, and hard foreign objects. After inspection, the products are placed on the large-area inspection fixture of the AOI inspection machine.

[0091] AOI inspection machine

[0092] Step 1, incoming materials: The previous process handling module puts 4 products into the narrow surface inspection fixture, the cylinder clamps them, and the linear motor moves to perform narrow surface appearance inspection. Two sets of cameras are set up on both sides of the linear motor and use the same inspection method as the bottom surface to inspect the defects of the two narrow surfaces respectively.

[0093] Step 2, Dual-Motion Sub-Module Material Picking: The narrow-face detection linear motor moves to the unloading position, the dual-motion sub-transfer module descends to pick up the material, and places the product on the variable pitch rotary station;

[0094] Step 3, Variable Pitch Rotation: After the four products are placed in the variable pitch rotation station, the cylinder extends and rotates each group of products 90 degrees.

[0095] Step 4, Loading onto the loop line: The dual-actuator linear motor picks up the material from the pitch module and places it onto the loop line fixture;

[0096] Step 5, Large and Top Surface Inspection: After the product is placed on the circular jig, the side-push cylinder extends to position the two products. The product moves in a circular motion, and visual inspection is performed on the large and top surfaces. The top surface includes three areas: the electrode post, the explosion-proof valve, and the top patch. In the explosion-proof valve area, a planar array camera, combined with coaxial light and four-zone ring light, illuminates the explosion-proof valve. An algorithm generates a synthetic image to detect defects such as electrolyte, scratches, and missing explosion-proof valves on the PP film surface. In the front area of ​​the electrode post, coaxial + zoned ring light illuminates the electrode post surface in a time-division manner, generating multiple images sequentially. The system uses images to detect defects such as scratches and electrolyte on the electrode surface; it also uses an area scan camera with a strip light to photograph the object in the sidewall area of ​​the electrode to detect defects such as scratches, breakage, and electrolyte crystallization in the sidewall; it uses a line scan camera with a coaxial light source and a 3D camera to photograph the top patch area to detect defects such as patch breakage, missing patch, and patch warping; it uses the same detection method as the bottom surface to detect defects in the two large surface areas, and adds a 3D camera to the large surface area to detect flatness defects separately.

[0097] Step 6, OK unloading mechanism: The OK unloading and conveying module picks up the material from the loop line and places it on the OK conveyor belt;

[0098] Step 7, NG unloading mechanism: The NG unloading and conveying module picks up the material from the loop line and places it on the NG belt line.

[0099] This invention ① combines a 2.5D imaging line scan camera, an area scan camera, and a 3D camera system to distinguish between bubbles on the membrane surface and foreign matter inside the membrane, reducing false detections and effectively improving the yield rate. ② Employing deep learning software and algorithms, and independently developed modular combinations, it can quickly expand its compatibility learning and training based on different customer samples, enabling production deployment within 2 days. ③ It can achieve automatic product detection through an automated conveyor system. ④ The visual inspection section uses a loop detection module to complete product operation, working in conjunction with a vision module for product appearance inspection. ⑤ It can be customized to interface with different coating machines; partial customization allows for integration with equipment from different coating machine manufacturers, improving the automation of post-coating processes. ⑥ It saves labor: one machine can replace 4-8 traditional workers. ⑦ It performs defective product re-inspection and verification: using a barcode scanner for re-inspection and verification, it quickly re-judges and processes defective products. ⑧ Products that pass manual re-inspection can be re-entered into the conveyor line via the production line.

[0100] The above description is only a specific embodiment of the present utility model. Various examples and illustrations do not constitute a limitation on the substantive content of the present utility model. Those skilled in the art can make modifications or variations to the above-described specific embodiments after reading the description without departing from the essence and scope of the utility model.

Claims

1. A device for detecting appearance defects in battery blue film, characterized in that: It includes an external conveyor belt and an AOI inspection machine; the external conveyor belt includes a feeding docking conveyor belt, an OK conveyor belt, an NG conveyor belt, a refill conveyor belt, and a discharging docking conveyor belt; the feeding docking conveyor belt and the discharging docking conveyor belt are respectively set at both ends of the OK conveyor belt, and the NG conveyor belt and the refill conveyor belt are set parallel between the feeding docking conveyor belt and the discharging docking conveyor belt and perpendicular to the OK conveyor belt. The AOI inspection machine is located to the side of the OK conveyor belt. The AOI inspection machine includes a loading and handling module, a bottom surface inspection vision module, a narrow surface inspection vision module, a large surface and top surface inspection vision module, a dual-movement handling module, a loop inspection module, a rotary pitch module, an OK unloading and handling module, and an NG unloading and handling module. The loading and handling module loads and handles the products, which are then inspected sequentially by the bottom surface inspection vision module and the narrow surface inspection vision module. After the bottom and narrow surface inspections, the products are transported by the dual-movement handling module to the rotary pitch module, rotated 90°, and then transported again to the loop inspection module for large surface and top surface inspection by the large surface and top surface inspection vision module. Finally, the products are unloaded by either the OK unloading and handling module or the NG unloading and handling module.

2. The battery blue film appearance defect detection device as described in claim 1, characterized in that: The top surface inspection includes three areas: the electrode region, the explosion-proof valve region, and the top patch region. The explosion-proof valve region is illuminated by an area scan camera with coaxial light and four-segment ring light, and a synthetic image is generated using an algorithm to detect electrolyte, scratches, and missing explosion-proof valve defects on the PP film surface. The front area of ​​the electrode region is illuminated sequentially by coaxial and four-segment ring light to generate multiple images, detecting scratches and electrolyte defects on the electrode surface. The sidewall area of ​​the electrode region is photographed by an area scan camera with strip light to detect scratches, damage, and electrolyte crystallization defects in the sidewall. The top patch region is photographed by a line scan camera with a coaxial light source and a 3D camera to detect patch damage, missing patches, and patch warping defects. The large-area inspection uses the same inspection method as the bottom surface to inspect defects in two large-area areas respectively, and the large-area flatness defects are inspected separately by adding a 3D camera to the large-area.

3. The battery blue film appearance defect detection device as described in claim 1, characterized in that: The material handling module includes a Y-axis linear motor, on which a Z-axis lead screw module is mounted; the Z-axis lead screw module is connected to a self-locking gripper, which is equipped with photoelectric sensors.

4. The battery blue film appearance defect detection device as described in claim 1, characterized in that: The bottom surface detection vision module includes a first and a second bottom surface line scan camera and a first and a second bottom surface line scan light source; the first and the second bottom surface line scan light sources are respectively arranged above the first and the second bottom surface line scan cameras, and the first and the second bottom surface line scan cameras are symmetrically arranged.

5. The battery blue film appearance defect detection device as described in claim 1, characterized in that: The AOI inspection machine also includes a linear motor module; the linear motor module includes a linear motor, and the linear motor is equipped with a rubber-coated gripper. The end face and side face of the rubber-coated gripper are respectively equipped with a large-face positioning cylinder assembly and a narrow-face positioning cylinder assembly.

6. The battery blue film appearance defect detection device as described in claim 1, characterized in that: The narrow-face detection vision module includes two first narrow-face 2.5D light sources, two second narrow-face 2.5D light sources, and first and second narrow-face 2.5D line scan cameras; the two first narrow-face 2.5D light sources and the two second narrow-face 2.5D light sources are arranged in a ring matrix, and the first and second narrow-face 2.5D line scan cameras are disposed on the sides of the two first narrow-face 2.5D light sources and the two second narrow-face 2.5D light sources.

7. The battery blue film appearance defect detection device as described in claim 1, characterized in that: The dual-moving-element transport module includes a first moving element and a second moving element; the first moving element is connected to a Z-axis lead screw module, and the Z-axis lead screw module is connected to a gripper cylinder; the second moving element is connected to a Z-axis cylinder.

8. The battery blue film appearance defect detection device as described in claim 1, characterized in that: The top and large surface inspection vision module includes two symmetrically arranged first line scan cameras and two symmetrically arranged second line scan cameras; the top and large surface inspection vision module inspects the poles, explosion-proof valves and top patch areas of the product.

9. The battery blue film appearance defect detection device as described in claim 1, characterized in that: The NG unloading and handling module includes a conveyor belt, and the side of the conveyor belt is provided with guide wheels that are in close contact with the product.

10. The battery blue film appearance defect detection device as described in claim 1, characterized in that: The OK conveyor belt has an anti-static belt; the OK conveyor belt, NG conveyor belt, and re-injection conveyor belt are all equipped with rubber-coated bearings.

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