Taping size detection method, system, device, equipment and storage medium

Abstract

Embodiments of the application disclose a method, system, device and equipment for detecting the size of a rubberized area, and a storage medium. The method comprises: obtaining a pre-rubberizing image of a pole piece collected after a die-cutting process and before a rubberizing process; obtaining a post-rubberizing image of the pole piece collected after the rubberizing process; wherein there is a preset number of interval image frames between the frame number of the pre-rubberizing image and the frame number of the post-rubberizing image, and the image data of the pre-rubberizing image and the image data of the post-rubberizing image are aligned; determining first distance information between a film area edge close to a die-cutting edge on the pole piece and the die-cutting edge based on the pre-rubberizing image; determining second distance information between a rubberizing area edge close to the film area on the pole piece and the die-cutting edge based on the post-rubberizing image; and determining rubberizing distance information of the rubberizing process in the width direction of the pole piece based on the first distance information and the second distance information. In this way, the size of the rubberized area can be detected for the pole piece exposed from the gravure by setting the positions of two cameras.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of battery technology, and in particular to a method, system, apparatus, device, and storage medium for detecting adhesive tape dimensions. Background Technology

[0002] In the manufacturing process of new energy batteries, the ceramic slurry coating of the cathode sheet of lithium iron phosphate (LFP) batteries can lead to false edges, affecting the coating speed and quality. At the same time, the die-cutting and slitting of the cathode sheet will produce burrs. Burrs can cause low voltage and fire risks, as well as problems such as electrode tab tearing, posing a great challenge to cell safety and resulting in huge losses every year.

[0003] To improve the safety of battery cells, such as Figure 1 As shown, the battery now features an automated tab processing (ATP) process, which eliminates the need for ceramic slurry and uses an adhesive bonding process at the die-cutting edges to prevent burrs and significantly improve cell safety. Figure 2 and Figure 3A As shown, the ATP process requires control of the adhesive bonding distance ab on membrane region 24, that is, the distance from adhesive bonding region 21 to membrane region 24. The value of adhesive bonding distance ab is detected by machine vision optical imaging scheme.

[0004] Currently, the adhesive bonding process for cathode electrodes includes... Figure 3A The gravure plate shown has exposed adhesive (with gravure plate) and Figure 3B The two types of gravure printing shown are those without exposed adhesive (without gravure printing). Figure 3A It can be seen that the adhesive area 21 covers the solder mark 22, the gravure plate 23, part of the film area 24, and part of the tab 25; from Figure 3B As can be seen, the adhesive application area 21 covers the solder mark 22, part of the film area 24, and part of the electrode tab 25. For the gravure printing process where the adhesive application is not exposed, conventional visual inspection methods can detect the adhesive application distance ab. However, for the gravure printing process where the adhesive application is exposed, firstly, because the color of the gravure plate and the film area may be similar, and an additional adhesive layer is added to the electrode sheet after the adhesive application process, and the adhesive application area covers part of the film area 24, the difficulty of identifying the edge of the film area 24 near the die-cut edge is greatly increased. Secondly, because the color of the adhesive in the adhesive application area may be opaque or semi-transparent, it is difficult to identify and distinguish the edge of the film area 24 near the die-cut edge in optical imaging. Summary of the Invention

[0005] In view of this, embodiments of this application provide a method, system, apparatus, device, and storage medium for detecting the size of adhesive tape.

[0006] The technical solution of this application is implemented as follows:

[0007] In a first aspect, embodiments of this application provide a method for detecting the size of adhesive tape, the method comprising:

[0008] The process involves acquiring an image of the electrode sheet before adhesive application, taken after the die-cutting process and before the adhesive application process; acquiring an image of the electrode sheet after adhesive application, taken after the adhesive application process; wherein there is a preset interval of image frame number between the frame number of the image before adhesive application and the frame number of the image after adhesive application, and the image data of the image before adhesive application and the image data of the image after adhesive application are aligned; based on the image before adhesive application, determining a first distance information between the edge of the film area near the die-cutting edge on the electrode sheet and the die-cutting edge; based on the image after adhesive application, determining a second distance information between the edge of the adhesive application area near the film area on the electrode sheet and the die-cutting edge; and based on the first and second distance information, determining the adhesive application distance information in the width direction of the electrode sheet during the adhesive application process.

[0009] Secondly, embodiments of this application provide a system for detecting the size of adhesive tape, comprising:

[0010] Two shooting stations, including a first shooting station and a second shooting station set sequentially along the electrode conveying direction;

[0011] The adhesive application station is located between the first and second shooting stations;

[0012] The two shooting stations each include a camera, which is used to take pictures of the electrode sheet before or after adhesive application to obtain images before or after adhesive application. The image before adhesive application is an image of the electrode sheet taken after the die-cutting process and before the adhesive application process, and the image after adhesive application is an image of the electrode sheet taken after the adhesive application process.

[0013] A vision-based host computer is used to acquire images before and after adhesive application. A preset interval of image frame number exists between the frame numbers of the images before and after adhesive application, and the image data of the images before and after adhesive application are aligned. Based on the image before adhesive application, a first distance is determined between the edge of the film area near the die-cut edge on the electrode and the die-cut edge. Based on the image after adhesive application, a second distance is determined between the edge of the adhesive application area near the film area on the electrode and the die-cut edge. Based on the first and second distance information, the adhesive application distance information in the electrode width direction is determined.

[0014] Thirdly, embodiments of this application provide a device for detecting the size of adhesive tape, the device comprising:

[0015] The first acquisition module is used to acquire the image of the electrode sheet before adhesive application, which is collected after the die-cutting process and before the adhesive application process.

[0016] The second acquisition module is used to acquire images of the electrode sheet after the adhesive application process; wherein there is a preset interval of image frame number between the frame number of the image before adhesive application and the frame number of the image after adhesive application, and the image data of the image before adhesive application and the image data of the image after adhesive application are aligned.

[0017] The first determining module is used to determine the first distance information between the edge of the film area near the die-cutting edge on the electrode sheet and the die-cutting edge based on the image before adhesive application;

[0018] The second determining module is used to determine the second distance information between the edge of the adhesive application area near the film area on the electrode sheet and the die-cutting edge based on the image after adhesive application;

[0019] The third determining module is used to determine the adhesive application distance information in the electrode width direction based on the first distance information and the second distance information.

[0020] Fourthly, embodiments of this application provide a computer device, including a memory, a processor, and a computer program stored in the memory. When the processor executes the computer program, it implements some or all of the steps in the above-described method for detecting the adhesive size.

[0021] Fifthly, embodiments of this application provide a computer-readable storage medium storing a computer program or instructions thereon, which, when executed by a processor, implement some or all of the steps in the above-described method for detecting adhesive size.

[0022] In this embodiment, two cameras (a first camera and a second camera) are used before and after the adhesive application station to acquire images before and after adhesive application, respectively. The first distance information between the edge of the film area and the die-cutting edge is identified in the image before adhesive application, and the second distance information between the edge of the adhesive application area (i.e., the boundary between the film area and the adhesive application) and the die-cutting edge is identified in the image after adhesive application. Finally, the adhesive application distance information on the film area is calculated using the first and second distance information, thus enabling control over the adhesive application distance. The method provided in this embodiment has the advantage of high real-time performance due to its online detection capability; furthermore, it is compatible with both gravure printing with and without exposed gravure printing plates, making it more widely applicable on production lines.

[0023] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of this application. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the technical solutions of this application.

[0025] Figure 1This is a schematic diagram of the ceramic slurry process and ATP process for batteries in related technologies;

[0026] Figure 2 This is a schematic diagram of the adhesive bonding distance ab on the membrane region in the relevant ATP process;

[0027] Figure 3A This is a schematic diagram of the gravure printing process with exposed adhesive in related technologies;

[0028] Figure 3B This is a schematic diagram of the non-exposed gravure printing adhesive application process in related technologies;

[0029] Figure 4 This is a schematic diagram of the electrode sheet before adhesive application after roll welding in related technologies;

[0030] Figure 5 A schematic diagram illustrating the principle of the adhesive distance ab on the detection membrane area that is compatible with two processes, provided in an embodiment of this application.

[0031] Figure 6A This is a schematic diagram of the camera mounting position in the case of a single pole piece, provided as an embodiment of this application.

[0032] Figure 6B This is a schematic diagram of the camera mounting position in the case of bipolar junctions, provided as an embodiment of this application.

[0033] Figure 7 A schematic diagram illustrating the implementation process of a method for detecting adhesive size provided in an embodiment of this application;

[0034] Figure 8 A schematic diagram showing the camera's position before applying adhesive, as provided in an embodiment of this application;

[0035] Figure 9 A schematic diagram of the electrode area captured by the camera before adhesive application, provided in an embodiment of this application;

[0036] Figure 10 A schematic diagram showing the placement of the camera after adhesive application, as provided in an embodiment of this application;

[0037] Figure 11 A schematic diagram illustrating frame alignment of the pre-application and post-application images provided in the embodiments of this application;

[0038] Figure 12 A schematic diagram illustrating the setting of multiple sets of distance information based on images before and after adhesive application, as provided in an embodiment of this application.

[0039] Figure 13 A schematic diagram of the composition structure of an adhesive size detection system provided in an embodiment of this application;

[0040] Figure 14A schematic diagram of the composition structure of an adhesive application size detection device provided in an embodiment of this application;

[0041] Figure 15 This is a schematic diagram of the hardware entity of a computer device provided in an embodiment of this application.

[0042] Figure label:

[0043] 1. Industrial control computer; 2. Data acquisition card; 4. Switch; 5. PLC (Programmable Logic Controller); 6. Light source controller; 7. Encoder; and 8. Marking machine.

[0044] First light source 11, second light source 12, infrared light source 12-1, white light source 12-2;

[0045] 21. Adhesive application area; 22. Welding stamp; 23. Gravure plate; 24. Film area; 25. Electrode tab;

[0046] Aluminum foil 41, intermediate coating 43;

[0047] 51 edge of the film area, 52 edge of the die-cutting area, 53 edge of the adhesive application area;

[0048] 60, 61, camera before applying adhesive; 62, camera after applying adhesive.

[0049] Normal line 81, light source 82, conveyor roller 83, electrode 84;

[0050] First acquisition module 1401, second acquisition module 1402, first determination module 1403, second determination module 1404, third determination module 1405;

[0051] Computer equipment 1500, processor 1501, communication interface 1502, memory 1503, bus 1504. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0053] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this application is for the purpose of describing embodiments of this application only and is not intended to be limiting of this application.

[0054] In the following description, references to "some embodiments," "this embodiment," "this application embodiment," and examples, etc., describe a subset of all possible embodiments. However, it is understood that "some embodiments" may be the same subset or different subset of all possible embodiments and may be combined with each other without conflict.

[0055] If the application documents contain similar descriptions such as "first / second", the following explanation shall be added: In the following description, the terms "first / second / third" are used only to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0056] Battery electrodes include cathode and anode electrodes. Cathode electrodes are typically made of aluminum foil, which is harder and more prone to burrs. Anode electrodes are typically made of copper foil, which is more flexible.

[0057] Tab tearing refers to the tearing of the tabs during battery charging, discharging, or mechanical vibration, caused by burrs becoming the initiation point of cracks.

[0058] A single tab refers to a structure where the electrode (cathode or anode) has a tab on only one side. This design is relatively simple to manufacture, has low cost, and is suitable for small batteries with low performance requirements.

[0059] Double tabs are a structure where tabs are located on both sides of the electrode. The double tab design effectively improves current distribution, reduces internal electrode resistance and polarization, and enhances the battery's high-current charge / discharge capability and cycle performance. It is commonly used in medium to large-sized power batteries or battery products with high performance requirements.

[0060] The adhesive distance ab on the membrane area refers to the size of the adhesive applied to the membrane area. The purpose of controlling the size of this area is to prevent the active material from chipping off at the edges.

[0061] Die-cutting or die-cutting slitting is the core process for processing coated cathode sheets into the target width and shape.

[0062] Gravure printing involves coating a layer of material onto the substrate surface before the actual coating.

[0063] The travel distance of the electrode sheet is the distance the electrode sheet moves during continuous conveying (such as through a coating machine, roller press, slitting machine, or testing equipment) since the electrode sheet is usually continuously conveyed in roll form.

[0064] Solder marks are traces left by roller welding on a substrate.

[0065] Die-cut edge: After coating, the electrode sheet needs to be cut in a die-cutting machine to form the tab. The edge without the tab is the edge after die-cutting.

[0066] Time-division stroboscopic: During the movement of the electrode, different image effects can be acquired at different times according to different light sources, which is more conducive to detection.

[0067] To facilitate understanding of the embodiments of this application, let's first introduce the tab. The tab is the connection point between the battery and the external circuit. The positive and negative terminals of the battery are connected to external devices or charging devices through the tab, thereby realizing the charging and discharging function of the battery.

[0068] The tabs after roll welding can be: tabs obtained by roll welding using aluminum foil roll welding equipment. The roll welding process ensures a more precise and reliable connection between the tabs and other parts of the battery, thereby improving the overall performance of the battery. For example... Figure 4 As shown, the electrode sheet before adhesive application includes aluminum foil 41, solder mark 22, intermediate coating 43, and film area 24. The intermediate coating 43 can be formed by a ceramic paste process or by a gravure process. The intermediate coating 43 formed by the ceramic paste process is white; the intermediate coating 43 formed by the gravure process is dark.

[0069] Regarding the control of adhesive application distance in the ATP process, this application provides a solution that is compatible with controlling the distance between exposed adhesive application on the gravure plate and non-exposed adhesive application on the gravure plate.

[0070] Because the edge of the gravure plate (i.e., the boundary between the gravure plate and the film area) cannot be reliably detected after adhesive application, this embodiment of the application uses two sets of vision inspection modules, one before and one after the adhesive application station, to bind the detection position of the image via an encoder. Taking the exposed gravure plate process as an example, such as... Figure 5 As shown, the adhesive application distance information ab on the film area is calculated by using the first distance information A between the edge 51 of the film area and the die-cutting edge 52 identified in the image before adhesive application and the second distance information B between the edge 53 of the adhesive application area (which can be understood as the boundary line between the film area and the adhesive application area) near the film area and the die-cutting edge 52 identified in the image after adhesive application. It should be noted that although... Figure 5 Taking the exposed gravure printing process as an example, this calculation principle also applies to the non-exposed gravure printing process. In the exposed gravure printing process, the edge of the film area near the die-cutting edge can be considered as the boundary line between the film area and the gravure plate, while in the non-exposed gravure printing process, it can be considered as the boundary line between the film area and the substrate.

[0071] Before introducing the method for detecting the adhesive size provided in the embodiments of this application, let's first introduce the distribution of the tabs and the corresponding camera settings.

[0072] In the design of battery electrodes (especially the cathode), the electrode tabs are distributed in two ways: single tab and double tab. The distinction between single and double tabs is based on whether the tabs are distributed on one side or both sides. For the case of a single tab, such as... Figure 6A As shown, after the die-cutting process and before the adhesive application process, a pre-adhesive application camera 61 is installed on one side of the electrode sheet; after the adhesive application module 60 completes the adhesive application process, a post-adhesive application camera 62 is installed on the same side of the electrode sheet; that is, one pre-adhesive application camera and one post-adhesive application camera are installed on the same side of the electrode sheet. In the case of a single electrode, the camera's field of view (at least its width) must be greater than the distance between the edge of the adhesive application area and the die-cutting edge. For line scanning cameras, the scanning width also has various specifications and can be customized according to actual needs.

[0073] In the case of bipolar electrodes, if the camera's scanning width is sufficient to simultaneously capture both electrodes, then the adhesive distance between the film areas on both sides of the electrode can also be captured simultaneously. If the camera's scanning width is less than half the electrode width (i.e., the electrode's width), then it can be done as follows: Figure 6B As shown, before the adhesive application process but after the die-cutting process, a camera 61 is installed on each side of the electrode sheet before adhesive application; after the adhesive application process, a camera 62 is installed on each side of the electrode sheet after adhesive application, for a total of four cameras. With four cameras, the field of view of the cameras is similar to that of a single electrode.

[0074] Based on the above, embodiments of this application provide a method for detecting the size of adhesive tape, such as... Figure 7 As shown, the detection method includes:

[0075] Step S701: Obtain an image of the electrode sheet before adhesive application, taken after the die-cutting process and before the adhesive application process.

[0076] In some embodiments, step S701 may be to acquire an image of the electrode sheet before adhesive application captured by the first camera after the die-cutting process and before the adhesive application process.

[0077] In this embodiment, the camera used to acquire images of the electrode (including the first camera in this step, and the second, third, and fourth cameras in subsequent steps) can be either an area scan camera or a line scan camera. Since line scan cameras are suitable for capturing large, continuous objects moving at high speeds, and electrode images fall into this category, high-resolution panoramic imaging can be achieved through line-by-line scanning. When using an area scan camera, the acquisition frequency of the area scan camera needs to be matched with the movement speed of the electrode to achieve continuous acquisition of electrode images. The following uses a line scan camera as an example. A 4K or 8K line scan camera can be used, and the light source can be a line light source. Common scanning widths include 164mm, 310mm, and 400mm. Wide-format line scan cameras can have a maximum detection width of 2300mm, and even a single camera can achieve a line scan width of 5m.

[0078] In this embodiment, the die-cutting process is the core step in processing the composite tab material into single or continuous tabs that conform to the design dimensions (length, width, shape). In the die-cutting process, such as... Figure 5 As shown, the cathode electrode is cut along the dividing line of the tab, thus forming individual tabs after the die-cutting process. The protruding part of this dividing line is the tab, and the straight line formed by connecting the non-protruding parts of the dividing line is the die-cutting edge 52 in this embodiment.

[0079] Step S702: Obtain the image of the electrode sheet after adhesive application, captured after the adhesive application process;

[0080] In some embodiments, step S702 may be to acquire an image of the electrode sheet after the adhesive bonding process captured by the second camera.

[0081] There is a preset interval of image frame number between the frame number of the image before adhesive application and the frame number of the image after adhesive application, and the image data of the image before adhesive application and the image data of the image after adhesive application are aligned.

[0082] The location of the first camera can be found in [reference needed]. Figure 6A The setup position of camera 61 before applying adhesive, and the setup position of the second camera can be found in [reference needed]. Figure 6B The setting position of camera 62 after the adhesive is applied.

[0083] In some embodiments, the first camera and the second camera acquire images at the same frequency and are triggered to take pictures using the same encoder; the first pulse number is equal to the second pulse number, wherein the first pulse number is the number of pulses emitted by the encoder corresponding to the electrode travel distance between the center lines of the first camera and the second camera, and the second pulse number is the number of pulses of the encoder corresponding to the acquisition of images at a preset interval of image frames.

[0084] In this embodiment, it is necessary to ensure that a frame captured by the first camera (the camera before applying adhesive) and a frame captured by the second camera (the camera after applying adhesive) are aligned. Image alignment means that the electrode areas captured by the two images are consistent, that is, the image data of the two frames correspond to the same electrode area without error.

[0085] In this embodiment, the alignment of the images before and after adhesive application is achieved physically. That is, it is necessary to set the electrode travel distance S between the center line of the camera before adhesive application and the center line of the camera after adhesive application. The electrode travel distance S corresponds exactly to the acquisition of m frames, where m frames is the preset interval image frame number.

[0086] Theoretically, the travel distance of the electrode ( D ) and encoder pulse count ( d The relationship formula is as follows:

[0087] D = ( d C) / ( i P);

[0088] in, D indicates Actual travel distance of the electrode sheet (unit: mm, m, etc., consistent with the unit of the conveyor roller circumference). d represents The total number of pulses output by the encoder; C The circumference of the conveyor roller (unit: e.g., mm, calculation formula is as follows) C = π × D , D (where the diameter is the conveyor roller). i This indicates the transmission ratio (the speed reduction / speed increase ratio between the drive shaft and the encoder; if the encoder is directly mounted on the drive shaft, ...). i =1); P This indicates the encoder's resolution (unit: pulses per revolution, i.e., the number of pulses output per revolution).

[0089] From the above formulas, we can see that for a specific conveying system, since the circumference C of the conveyor roller and the transmission ratio i are fixed, if the number of pulses d is known, then the number of pulses d can be converted into the corresponding electrode travel distance D. Furthermore, if the electrode travel distance S is known, then the electrode travel distance S can be converted into the number of encoder pulses s (i.e., the first pulse number), i.e., D / d = S / s, or s = dS / D. Simultaneously, assuming the number of pulses corresponding to acquiring one frame of image is r, then the total number of pulses corresponding to acquiring m frames of image is mr (i.e., the second pulse number). To make the second pulse number mr equal to the first pulse number s, i.e., mr = s, we can adjust at least one of the following: the position of the conveyor roller, the diameter of the conveyor roller, and the transmission ratio, so that the electrode travel distance S satisfies the target relationship: dS / D = mr, or S = mrD / d.

[0090] Step S703: Based on the image before adhesive application, determine the first distance information between the edge of the film area near the die-cutting edge on the electrode sheet and the die-cutting edge;

[0091] In this example, as Figure 5 As shown, edge extraction is performed on the image before adhesive application to extract the edge 51 of the film area and the die-cut edge 52; then the vertical distance information between the edge 51 of the film area and the die-cut edge 52 is calculated to obtain the first distance information.

[0092] Step S704: Based on the image after adhesive application, determine the second distance information between the edge of the adhesive application area near the film area on the electrode and the die-cutting edge;

[0093] In this example, as Figure 5 As shown, edge extraction is performed on the image after adhesive application, extracting the edge 53 of the adhesive application area (i.e. the boundary line between the adhesive application area and the film area) and the die-cutting edge 52 near the film area; then the vertical distance information between the edge 53 of the adhesive application area and the die-cutting edge 52 is calculated, which yields the second distance information.

[0094] In the embodiment, steps S701 and S702 are executed in no particular order, as are steps S703 and S704.

[0095] Step S705: Based on the first distance information and the second distance information, determine the adhesive application distance information in the electrode width direction for the adhesive application process.

[0096] In this embodiment, the adhesive application distance information refers to the distance between the adhesive application area and the electrode film area along the electrode width direction, i.e., the size information of the adhesive application area to the film area. The purpose of controlling the size of this area in the adhesive application process is to prevent edge breakage of the active material.

[0097] In this embodiment, the first distance information, the second distance information, and the adhesive application distance information can be a single value or a set of values, i.e., an array.

[0098] In this embodiment, two cameras (a first camera and a second camera) are used before and after the adhesive application station to acquire images before and after adhesive application, respectively. The first distance information between the edge of the film area and the die-cutting edge is identified in the image before adhesive application, and the second distance information between the edge of the adhesive application area (i.e., the boundary between the film area and the adhesive application) and the die-cutting edge is identified in the image after adhesive application. Finally, the adhesive application distance information on the film area is calculated using the first and second distance information, thus enabling control over the adhesive application distance. The method provided in this embodiment has the advantage of high real-time performance due to its online detection capability; furthermore, it is compatible with both gravure printing with and without exposed gravure printing plates, making it more widely applicable on production lines.

[0099] For detection purposes, multiple sampling coordinate points are usually set on the two aligned images (image before and image after adhesive application). At each coordinate point, there is a first distance information and a second distance information, and thus multiple coordinate points correspond to a set of adhesive application distance information.

[0100] like Figure 5 As shown, for a frame of image before adhesive application, the edge 51 of the film area and the die-cutting edge 52 can be approximated as straight lines. In order to ensure detection accuracy, multiple sets of pixels (the first set of pixels) can be taken correspondingly for the edge 51 of the film area and the die-cutting edge 52. The vertical coordinates of each set of pixels in the first set of pixels are the same, and the difference in the horizontal coordinates of a set of pixels is the vertical distance information between the edge 51 of the film area and the die-cutting edge 52.

[0101] For a frame of the image after adhesive application, the edge 53 of the adhesive application area and the die-cutting edge 52 can be approximated as straight lines. In order to ensure detection accuracy, multiple sets of pixels (the second set of pixels) can be taken correspondingly at the edge 53 of the adhesive application area and the die-cutting edge 52. The vertical coordinates of each set of pixels in this second set of pixels are the same, and the difference in the horizontal coordinates of a set of pixels is the vertical distance information between the edge 53 of the adhesive application area and the die-cutting edge 52.

[0102] Continue as Figure 5 As shown, since the adhesive application distance information ab is equal to the distance difference between the second distance information B and the first distance information A at the corresponding coordinate points, if only one distance value is calculated for the images before and after adhesive application, then the second distance information B and the first distance information A are the same distance value. In implementation, for the image before adhesive application, a coordinate point can be randomly or fixedly selected on the edge 51 of the film area or the die-cut edge 52, and then the vertical distance to the other edge can be calculated, which is the distance information A before adhesive application. For the image after adhesive application, a coordinate point can be randomly or fixedly selected on the edge 53 of the adhesive application area or the die-cut edge 52, and then the vertical distance to the other edge can be calculated, which is the distance information B after adhesive application. This embodiment represents the distance of the entire image through a single-point distance value, which has lower detection accuracy.

[0103] To achieve higher detection accuracy, as mentioned above, a first set of pixels can be taken from the image before adhesive application, and a second set of pixels can be taken from the image after adhesive application. These two sets of pixels also need to be aligned, meaning their vertical coordinates are the same. Based on this, in one embodiment, after identifying the die-cut edge, before step S705, the method further includes: setting multiple identical vertical or horizontal coordinate points on the die-cut edge in both the image before and after adhesive application.

[0104] Correspondingly, step S705, based on the first distance information and the second distance information, determines the adhesive application distance information in the electrode width direction, including: for each same vertical or horizontal coordinate point, determining the adhesive application distance information in the electrode width direction by using the difference information between the second distance information and the first distance information.

[0105] In this embodiment, since both the pre-adhesive image and the post-adhesive image identify the die-cut edge (i.e., based on the die-cut edge), and since the image data of the pre-adhesive image and the post-adhesive image are aligned (the error of the image coordinates is within the allowable error range), taking the same coordinate point (the same vertical coordinate point or horizontal coordinate) on the die-cut edge of the pre-adhesive image and the post-adhesive image ensures that the final adhesive distance information is accurate. That is, the first distance information and the second distance information correspond to the same position on the electrode. Thus, by subtracting the second distance information from the first distance information, the adhesive distance information is obtained.

[0106] The first and second distance information correspond to the same location on the electrode. This can be understood as follows: assuming a mark is made on the electrode, the difference between the coordinates of the mark (first coordinate point) in the image before adhesive application and the coordinates of the mark (first coordinate point) in the image after adhesive application is within the allowable error range. Ideally, the first and second coordinate points should be identical. In practice, the images before and after adhesive application are as follows: Figure 12 As shown, if multiple identical ordinate points are taken; if... Figure 12 If the images before and after applying the adhesive are rotated by 90 degrees, then multiple identical horizontal coordinate points are taken.

[0107] In this embodiment, since the first camera and the second camera are triggered by the same encoder, the image frame numbers captured by the first camera and the second camera at the same time (or under the same pulse) are consistent. That is to say, when the encoder emits the same pulse number, the first camera captures the 3003rd frame image, and the second camera also captures the 3003rd frame image.

[0108] In one implementation, the first camera first acquires the 3003rd frame of the image before adhesive application. The image acquisition card then sends this 3003rd frame to the vision-based host computer. The host computer determines first distance information based on the pre-application image and stores it in correspondence with the image frame number (3003rd frame). After an interval of m frames, the second camera acquires the 3003+mth frame of the image after adhesive application (aligned with the image data of the 3003rd frame of the pre-application image). The acquisition card sends this post-application image to the vision-based host computer, which determines second distance information based on it. Then, based on the 3003+mth frame of the post-application image, the vision-based host computer determines the frame number of the pre-application image as 3003rd frame and retrieves it from the stored data.

[0109] In the first example, the second camera captures the image after adhesive application at frame 3003+m, and then the image acquisition card sends this image to the vision host computer. The vision host computer determines that the frame number of the image before adhesive application, which is aligned with the image data of the image before adhesive application at frame 3003+m, is frame 3003. In the second example, the first camera captures the image before adhesive application at frame 3003, and then the image acquisition card sends this image to the vision host computer. The vision host computer determines that the frame number of the image after adhesive application, which is aligned with the image data of the image before adhesive application at frame 3003, is frame 3003+m. In both the first and second examples, the vision host computer can acquire the image before and after adhesive application with image data aligned by a preset interval of image frames m. Then, the vision host computer determines the first distance information based on the image before adhesive application, determines the second distance information based on the image after adhesive application, and further determines the adhesive application distance information based on the first and second distance information.

[0110] Based on this, in one embodiment, step S702, acquiring the post-adhesion image of the electrode sheet after the adhesive bonding process, includes: acquiring the post-adhesion image of the electrode sheet after the adhesive bonding process captured by the second camera according to a preset interval of image frames, based on the frame number of the pre-adhesion image. In another embodiment, step S701, acquiring the pre-adhesion image of the electrode sheet after the die-cutting process and before the adhesive bonding process, includes: acquiring the pre-adhesion image of the electrode sheet after the die-cutting and adhesive bonding process captured by the first camera according to a preset interval of image frames, based on the frame number of the post-adhesion image.

[0111] Because there is a preset interval of image frames between the images before and after applying the adhesive, adding this interval to the frame number of the image before applying the adhesive yields the frame number of the image after applying the adhesive. Similarly, subtracting this interval from the frame number of the image after applying the adhesive yields the frame number of the image before applying the adhesive. See also Figure 11The preset interval image frame number m=2. Assuming the frame number of the image before applying the adhesive is 1, adding the interval image frame number 2 to the frame number of the image before applying the adhesive is 1 gives the frame number 3 of the image after applying the adhesive. That is, the image data of the image before applying the adhesive and the image after applying the adhesive are aligned. If the frame number of the image after applying the adhesive is 10, then subtracting the interval image frame number 2 from the frame number of the image after applying the adhesive is 10 gives the frame number 8 of the image before applying the adhesive. That is, the image data of the image before applying the adhesive and the image after applying the adhesive are aligned.

[0112] In this embodiment, after acquiring the images before and after adhesive application, edge extraction needs to be performed on both frames. Regardless of whether the gravure plate is exposed or not, only the film area edge and die-cut edge need to be extracted from the image before adhesive application; for the image after adhesive application, only two edges (die-cut edge and adhesive area edge) need to be extracted. Then, for the image before adhesive application, the first distance information between the two edges is calculated; for the image after adhesive application, the first distance information between the two edges is calculated; finally, the second distance information of the image after adhesive application is subtracted from the first distance information obtained in the image before adhesive application to obtain the adhesive application distance information.

[0113] Thus, step S703, based on the image before adhesive application, determines the first distance information between the edge of the film area near the die-cut edge on the electrode sheet and the die-cut edge, including steps S7031 and S7032, wherein: step S7031, based on the image before adhesive application, determines the edge of the film area near the die-cut edge on the electrode sheet and the die-cut edge; step S7032, determines the vertical distance information between the edge of the film area and the die-cut edge as the first distance information;

[0114] Step S704: Based on the image after adhesive application, determine the second distance information between the edge of the adhesive application area near the film area and the die-cut edge on the electrode sheet, including steps S7041 and S7042, wherein: Step S7041: Based on the image after adhesive application, determine the die-cut edge of the electrode sheet and the edge of the adhesive application area near the film area; Step S7042: Determine the vertical distance information between the edge of the adhesive application area and the die-cut edge as the second distance information.

[0115] In one embodiment, step S703, based on the image before adhesive application, determines the first distance information between the edge of the film area near the die-cutting edge on the electrode sheet and the die-cutting edge, including steps S731 to S733, wherein:

[0116] Step S731: Based on the image before adhesive application, identify the edge of the film area and the die-cut edge on the electrode sheet near the die-cut edge;

[0117] Step S732: According to each pixel coordinate point in the preset pixel coordinate point set, pixel points are taken on the edge of the film area and on the die-cutting edge respectively to obtain the first set of pixel coordinate point pairs;

[0118] Here, the preset set of coordinate points consists of multiple coordinate points randomly or at intervals selected along a straight line chosen from the direction of the die-cut edge. In other words, these coordinate points are identical in terms of either the x-coordinate or the y-coordinate. Taking the interval selection as an example, if the x-coordinates are identical, then the y-coordinates are intervals. If the y-coordinates are identical, then the x-coordinates are intervals.

[0119] Step S733: Based on each pixel coordinate pair in the first pixel coordinate pair set, determine the first distance array, which includes multiple first distance information.

[0120] In this embodiment, pixels are taken on both sides using the same preset coordinate point to realize the vertical distance between the two sides (the edge of the film area and the die-cut edge) on the image before adhesive application. Since multiple coordinate points can be set according to the detection requirements, the detection accuracy is guaranteed.

[0121] In one embodiment, step S704, based on the image after adhesive application, determines the second distance information between the edge of the adhesive application area near the film area on the electrode and the die-cutting edge, including steps S741 to S743, wherein:

[0122] Step S741: Based on the image after adhesive application, identify the edge of the adhesive application area and the die-cut edge on the electrode sheet near the film area;

[0123] Step S742: According to each pixel coordinate point in the preset pixel coordinate point set, pixel points are taken on the edge of the adhesive area and on the die-cutting edge respectively to obtain the second pixel coordinate point pair set.

[0124] Here, the preset set of coordinate points consists of multiple coordinate points randomly or at intervals along the direction of the die-cut edge. That is, if the direction of the die-cut edge is vertical, the x-coordinates of these coordinate points on a single adhesive application area edge or a single die-cut edge are the same, while the y-coordinates are multiple and different. If the direction of the die-cut edge is horizontal, the y-coordinates of these coordinate points on a single adhesive application area edge or a single die-cut edge are the same, while the x-coordinates are multiple and different. For a single adhesive application area edge or a single die-cut edge, taking the interval selection as an example, if the x-coordinates are the same, then the y-coordinates are intervals. If the y-coordinates are the same, then the x-coordinates are intervals. For the adhesive application area edge and the die-cut edge in the image after adhesive application, if the direction of the die-cut edge is vertical, then the two corresponding y-coordinate points on the adhesive application area edge and the die-cut edge are the same, and the difference between the two x-coordinate points is the second distance information.

[0125] Step S743: Based on each pixel coordinate pair in the second pixel coordinate pair set, determine the second distance array, which includes multiple second distance information.

[0126] It should be noted that the preset pixel coordinate point sets in steps S742 and S732 can be the same. In this case, the first distance array and the second distance data are aligned, meaning that the number of elements in the first distance array and the second distance array are the same, and the first distance information and second distance information at the same element position in the first distance array and the second distance array correspond to the same coordinate point. Alternatively, the preset pixel coordinate point sets in steps S742 and S732 can be different. If they are different, the first distance array and the second distance array need to be filtered. The filtering should be based on the intersection of the two pixel coordinate point sets to obtain the target first distance array and the target second distance data, thus unifying the two arrays to the same coordinate point.

[0127] In this embodiment, pixels are taken on both sides using the same preset coordinate point to realize the vertical distance between the two sides of the image after adhesive application (the edge of the adhesive area near the film area and the die-cut edge). Since multiple coordinate points can be set according to the detection requirements, such as taking points at intervals of 5 pixels or 10 pixels, the detection accuracy is guaranteed.

[0128] This application describes the arrangement of two cameras (the camera before adhesive application and the camera after adhesive application) on one side of the electrode, the process of image acquisition and image processing, and the same applies to the other side.

[0129] When the gravure plate is not exposed, the camera's acquisition area before adhesive application includes at least the tab area, the solder joint, and part of the film area, which is the area close to the solder joint. When the gravure plate is exposed, the acquisition area also includes the gravure plate area located between the solder joint area and the film area. The camera's image acquisition position settings before adhesive application can be found in [reference needed]. Figure 8 The left and right images, Figure 8 The left image is the front view. Figure 8 The right figure is a side view, with the field of view of the camera 61 before adhesive application facing the contact area between the conveyor roller 83 and the electrode 84. The center line of the field of view of the camera 61 before adhesive application forms a first angle with the normal 81, and the center line of the light source 82 forms a second angle with the normal 81. The first angle is in the range of [-15°, +15°], and the second angle is in the range of [55°-20°, 55°+20°]. In the case of a line scan camera, the acquisition area of ​​the line scan camera on the electrode 84 is a straight line. The line passing through this straight line and forming a tangent plane with the curved surface where the conveyor roller 83 is located, perpendicular to both the tangent plane and this straight line, is taken as the normal 81.

[0130] For cases where the gravure plate is not exposed (without the gravure plate), the image captured by the camera before adhesive application is identified. The identified content includes the die-cut edge and the edge of the film area near the die-cut edge. For cases where the gravure plate is exposed (with the gravure plate), such as... Figure 9 As shown, the camera 61 before adhesive application is positioned before the adhesive application module 60. The camera 61 captures images of the area before adhesive application and identifies the following: the die-cut edge 52 and the edge of the film area near the die-cut edge. Regardless of whether the gravure plate is exposed or not, the edges to be identified include the die-cut edge 52 and the edge of the film area 51 near the die-cut edge. In other words, the aforementioned distance A before adhesive application is the distance between the edge of the film area 51 and the die-cut edge 52.

[0131] The camera after applying the adhesive layer captures an image with an additional adhesive layer on top of the camera's acquisition area before the adhesive layer was applied. Generally, the adhesive layer may be semi-transparent or opaque, which can obscure the intaglio plate, causing inaccurate or undetectable identification of the adhesive layer size using conventional optical recognition. The image acquisition position setting of the camera after applying the adhesive layer in this embodiment can be referred to... Figure 10 . Figure 10 The left image is a front view, showing the center line and normal of the field of view of the camera 62 after the adhesive has been applied (and). Figure 9 The first light source 11 and the normal have a first included angle, the center line of the first light source 11 and the normal have a second included angle, and the center line of the second light source 12 and the tangent plane have a third included angle. The first included angle is in the range of [-15°, +15°], the second included angle is in the range of [55-20°, 55+20°], and the third included angle is in the range of [45°-20°, 45°+20°]. The first light source 11 and the second light source 12 do not block each other. Figure 10 The right figure is a top view of one implementation method. In this implementation method, the first light source 11 is in a constant-on mode, and the second light source 12 includes an infrared light source 12-1 and a white light source 12-2 set on both sides. The two light sources 12-1 and 12-2 adopt time-division strobe technology.

[0132] It should be noted that although the color of the film area and the gravure plate may be similar, existing optical inspection solutions can still identify the edge of the film area for images before adhesive application. Furthermore, in order to more clearly identify the die-cut edge, the edge of the adhesive application area, and the edge of the film area, both images before and after adhesive application can be captured using time-division stroboscopic technology to acquire bright and dark stroboscopic images, thereby improving recognition accuracy.

[0133] Regardless of whether the gravure plate is exposed or not, the boundary lines to be identified when recognizing the image captured by the camera after the adhesive is applied include the die-cut edge and the edge of the adhesive application area near the film area (the boundary line between the film area and the adhesive). In other words, the aforementioned distance B before the adhesive is applied is the distance between the boundary line between the film area and the adhesive and the die-cut edge.

[0134] In this embodiment of the application, in order to detect the adhesive distance ab on the film area, it is necessary to ensure that a frame of the image captured by the camera before adhesive application and a frame of the image captured by the camera after adhesive application are aligned. Image alignment means that the electrode area captured by the two images is consistent, that is, the image data of the two frames correspond to the same electrode area without error.

[0135] Example 1: Before applying adhesive, the electrode area captured by the camera in frame N corresponds to an electrode length from 5000mm to 5200mm. After applying adhesive, the electrode area captured by the camera in frame N+m also corresponds to an electrode length from 5000mm to 5200mm. This is achieved through the physical alignment of the two cameras in the electrode area.

[0136] Example 2: Before applying adhesive, the electrode area captured by the camera in frame N corresponds to an electrode length of 5000mm to 5200mm. After applying adhesive, the electrode area captured by the camera in frame N+m corresponds to an electrode length of 5010mm to 5210mm. Since the two cameras are not physically aligned in the electrode areas they capture, image recognition is needed to align the two images to a single electrode area. For example, aligning them both to 5000mm to 5200mm requires stitching together the electrode lengths from frame N+m (5010mm to 5210mm) of the camera with adhesive applied, and the electrode lengths from frame N+m-1 (5000mm to 5010mm) of the camera with adhesive applied, to obtain the electrode lengths from 5000mm to 5010mm corresponding to the camera with adhesive applied.

[0137] In Example 1, the images captured by the two cameras correspond to electrode areas spaced exactly m frames apart. That is, the electrode areas captured by the camera after applying the adhesive are exactly m frames apart from the electrode areas captured by the camera before applying the adhesive. This ensures image alignment and eliminates the need for post-processing alignment. It's important to note that post-processing alignment requires continuous markings on the electrode plates (which are generally not present), and each frame must contain these markings for image alignment via image recognition. Therefore, in Example 1, if the two cameras are physically aligned in their electrode areas, no markings on the electrode plates or post-processing are necessary.

[0138] To achieve physical alignment between the images before and after adhesive application in Example 1 above, the electrode travel distance S between the camera's centerline before and after adhesive application needs to be set. This distance S should correspond exactly to the acquisition of m frames, where m is an integer. There are two methods for setting S:

[0139] 1) Theoretical method: In mechanical 3D simulation, it is theoretically known that the number of pulses d can be converted into the corresponding running distance D of the pole piece. And when the running distance S of the pole piece is known, S can be converted into the number of pulses s of the encoder, that is, the target number of pulses s corresponding to the running distance S of the pole piece = (dS / D).

[0140] Meanwhile, assuming that the number of pulses corresponding to collecting one frame of image is r, then the total number of pulses corresponding to cumulatively collecting m frames of images is mr. To make mr = s, by adjusting at least one of the position of the conveying roller, the diameter of the conveying roller, and the transmission ratio, the running distance S of the pole piece is made to satisfy the target relationship: dS / D = mr.

[0141] 2) Engineering practice method: Make a marker manually rotate from the center line position of the camera before gluing to the center line position of the camera after gluing, record the number of pulses rotated by the encoder, repeat three times, and calculate the average value k. By adjusting at least one of the position of the conveying roller, the diameter of the conveying roller, and the transmission ratio, the running distance S of the pole piece is adjusted to make k exactly equal to mr.

[0142] It should be noted that the number of image frames in the interval between the camera before gluing and the camera after gluing needs to be combined with the mechanism design. That is to say, the running distance S of the pole piece needs to be determined according to the space size and cost of the equipment (it cannot be any value as desired) and the number of scanning lines required for a single frame of image (that is, the corresponding physical length of the pole piece for the corresponding line-scanned image acquisition). And the requirements for the running distance S of the pole piece between the two cameras before and after gluing need to be evaluated in combination with the algorithm processing time of a single frame of image (processing boundary values) and the physical length of the pole piece corresponding to a single frame of image. The following is an example:

[0143] Suppose the physical length of the pole piece corresponding to a single frame of image is not less than 200 mm (considering the beat and algorithm processing time), that is, the length of a single frame of image is greater than 200 mm (S > 200 mm).

[0144] The configuration method is as follows: If 200 mm < S < 400 mm, the image length is set to S; if 400 mm < S < 600 mm, the image length is set to S / 2; if S > 600 mm, the image length can be set according to the requirements.

[0145] The following explains the frame alignment method: Since the cameras before and after gluing use the same encoder trigger source and are set to start simultaneously by the software, the two cameras collect images at the same frequency. Taking the example that there are two frames of images between the two cameras (that is, the preset number of interval image frames m = 2), see Figure 11 , first perform frame alignment:

[0146] The first frame captured by the camera before applying the adhesive is aligned with the third frame captured by the camera after applying the adhesive; the second frame captured by the camera before applying the adhesive is aligned with the fourth frame captured by the camera after applying the adhesive; and so on, until the Nth frame captured by the camera before applying the adhesive is aligned with the N+2th frame captured by the camera after applying the adhesive.

[0147] The images captured by the camera before and after adhesive application are aligned by aligning the image frame signals, thus aligning the image data. Both the pre-application and post-application images are referenced to the edge of the substrate (die-cut edge), such as... Figure 12 As shown, a set of ordinates is selected at intervals of M pixels. A first spacing array (first distance information) of the coordinate positions shown in the figure is obtained on the image before adhesive application: a[n]={a1, a2, a3, ……, an-2, an-1, an}; a second spacing array (second distance information) of the coordinate positions shown in the figure is obtained on the image after adhesive application: b[n]={b1, b2, b3, ……, bn-2, bn-1,bn}. Then, the adhesive application distance information on the film area is calculated: c[n]={b1-a1, b2-a2, b3-a3, … …, bn-2-an-2,bn-1-an-1, bn-an}.

[0148] It should be noted that: 1) Since the pre-gluing camera and post-gluing camera use an asynchronous, same-frequency method, both cameras need to start or stop simultaneously to ensure frame alignment data. The host device and the vision control computer need to be interlocked. 2) The above embodiments partially describe the detection logic for exposed gravure plates. The same retrieval logic can be used for products where the gravure plate is not exposed. The host device can be a die-cutting device in the die-cutting process and an adhesive application device in the adhesive application process.

[0149] This application provides an overall hardware layout for an adhesive application size detection system, such as... Figure 13 As shown, the overall hardware includes an industrial computer 1, a data acquisition card 2, a camera 62 or 63, a switch 4, a PLC 5, a light source controller 6, an encoder 7, and a marking machine 8, wherein:

[0150] Industrial PC 1 serves as the image processing terminal in the system, compatible with various operating systems and supporting the operation of host computer software in various programming languages. The industrial PC typically also has a monitor to graphically display the processed results output by the industrial PC, facilitating user interaction. The industrial PC is equipped with host computer software (vision-based host computer). When it detects that the adhesive distance ab on the film area does not meet the requirements, it sends a control command to PLC 5. PLC 5 then controls the marking machine 8 to mark the electrode sheet, indicating that the adhesive distance in the corresponding electrode area is insufficient.

[0151] The acquisition card 2 includes at least two, each of which is connected to a line scan camera (camera 62 before adhesive application or camera 63 after adhesive application). The line scan camera is used to perform line-by-line exposure based on the running speed and beat of the electrode film to form a complete line scan image that meets the size requirements.

[0152] As before, in the case of bipolar heads, if there are 4 line scan cameras, there are 4 corresponding acquisition cards 2. If the line scan camera is the camera before adhesive application, the acquired image before adhesive application is processed by the acquisition card to obtain the first distance information A; if the line scan camera is the camera after adhesive application, the acquired image after adhesive application is processed by the corresponding acquisition card to obtain the second distance information B. The host computer software installed on the industrial control computer 1 determines the adhesive application distance information ab based on the second distance information B and the first distance information A.

[0153] Switch 4 is mainly used for instruction interaction between the light source controller 6, PLC 5, etc., and the industrial control computer to synchronize the pulses emitted by the encoder. In this embodiment, the encoder synchronously controls multiple acquisition cards to simultaneously acquire images and controls multiple light source controllers to flash according to the strobe requirements.

[0154] PLC 5 can interact with industrial computer 1, for example, loading control commands from industrial computer 1 into memory for storage and execution at any time. PLC 5 is mainly responsible for distance calculation. After receiving an alarm signal from industrial computer 1, it controls the marking machine 8 to mark the electrode sheets within a certain distance.

[0155] The light source controller 6 is used to control the light source. The size of the light source can be selected according to the requirements. Selecting a light source with high brightness and excellent uniformity can effectively ensure the consistency of imaging.

[0156] The encoder 7 is typically pressed onto the conveyor roller. The encoder 7 outputs a pulse signal every time it rotates a certain angle. The light source controller 6 controls the strobe light source to strobe. At the same time, when the light source is stroking, the acquisition card triggers the line scan camera to capture one line of image data of the electrode, thereby driving the uniformity of the line scan camera's shooting frequency and the electrode's movement speed, ensuring that the line scan camera stably outputs line scan images at different speeds.

[0157] In one example, to more clearly extract the edges (i.e., edge detection) in the images before and after adhesive application, a stroboscopic light source can be used. At least two sets of light sources alternately illuminate the electrode at a preset stroboscopic time, ensuring that the electrode is sequentially illuminated by both light sources during its movement, exhibiting different brightness levels at different points in time. Since the camera captures bright and dark stroboscopic images of the electrode at different brightness levels (meaning both the images before and after adhesive application are stroboscopic images), these images are then split to obtain a bright field image with higher brightness and a dark field image with lower brightness. The boundary lines between the bright and dark field images are then extracted (edge ​​detection) to determine the boundary lines corresponding to the images before and after adhesive application. Therefore, this method is beneficial for detecting the boundary lines of the electrode based on the bright field image with higher brightness and the dark field image with lower brightness, thus improving detection accuracy. The bright and dark stroboscopic images are obtained by alternately illuminating the moving, roller-welded electrode (either the electrode before or after adhesive application) with at least two sets of light sources at a preset stroboscopic time.

[0158] In implementation, two light source controllers 6 respond to the trigger signal and control at least two sets of light sources on the detection station to alternately illuminate the moving electrode at a preset flash time; wherein, the trigger signal can be a pulse signal issued by the PLC or a pulse signal issued by the encoder.

[0159] This application provides a system for detecting the size of adhesive tape, referring to the above. Figure 13 , Figure 6A and Figure 8 The detection system includes:

[0160] Multiple conveying rollers 83 for conveying electrode sheets, the multiple conveying rollers including at least a first conveying roller and a second conveying roller;

[0161] Two shooting stations are provided, including a first shooting station and a second shooting station arranged sequentially along the conveying direction of the electrode sheet; wherein, the first shooting station is arranged corresponding to the first conveying roller and is used to shoot the first surface (i.e. the adhesive surface) of the electrode sheet located on the roller surface of the first conveying roller; the second shooting station is arranged corresponding to the second conveying roller and is used to shoot the first surface of the electrode sheet located on the roller surface of the second conveying roller.

[0162] The adhesive application station (adhesive application module 60) is located between the first shooting station and the second shooting station;

[0163] The two shooting stations each include a camera (61 and 62), which is used to take pictures of the electrode sheet before or after adhesive application to obtain images before or after adhesive application. The image before adhesive application is an image of the electrode sheet taken after the die-cutting process and before the adhesive application process, and the image after adhesive application is an image of the electrode sheet taken after the adhesive application process.

[0164] A vision-based host computer is used to acquire images before and after adhesive application. A preset interval of image frame number exists between the frame numbers of the images before and after adhesive application, and the image data of the images before and after adhesive application are aligned. Based on the image before adhesive application, a first distance is determined between the edge of the film area near the die-cut edge on the electrode and the die-cut edge. Based on the image after adhesive application, a second distance is determined between the edge of the adhesive application area near the film area on the electrode and the die-cut edge. Based on the first and second distance information, the adhesive application distance information in the electrode width direction is determined.

[0165] In some embodiments, the light source includes strip light sources and array light sources. In some embodiments, a strip light source may consist of multiple LEDs arranged in a straight line; an array light source may include multiple strip light sources connected end-to-end to form a square frame structure. Both strip light sources and array light sources can produce high-intensity light with uniform illumination, resulting in clear and bright lighting for the rolled-welded electrode sheets. This uniform illumination helps reduce shadows and reflections, thereby improving image quality.

[0166] The vision host computer is an important component of a machine vision system. It is usually a computer or a special device (e.g., an industrial computer) used to control and manage the entire machine vision system. It can receive image data from the image acquisition card and perform image processing and analysis on it.

[0167] In some embodiments, the detection system further includes: an encoder, used to trigger the first camera at the first shooting station and the second camera at the second shooting station to take pictures simultaneously;

[0168] Wherein, the first pulse count is equal to the second pulse count. The first pulse count is the number of encoder pulses corresponding to the electrode travel distance between the center lines of the first camera and the second camera, and the second pulse count is the number of encoder pulses corresponding to the number of image frames acquired at a preset interval. In some embodiments, the first pulse count is greater than the number of pulses accumulated when acquiring one frame of image.

[0169] In some embodiments, the plurality of conveying rollers further includes a third conveying roller and a fourth conveying roller, wherein:

[0170] The third conveying roller is symmetrically arranged with respect to the first conveying roller along the width direction of the cathode sheet;

[0171] The fourth conveyor roller is symmetrically arranged with respect to the second conveyor roller along the width direction of the cathode sheet;

[0172] At least two imaging stations also include a third imaging station and a fourth imaging station for capturing images of the first surface of the electrode sheet. The third imaging station is set up in correspondence with the third conveyor roller, and the fourth imaging station is set up in correspondence with the fourth conveyor roller.

[0173] Based on the foregoing embodiments, this application further provides a device for detecting the adhesive application size, such as... Figure 14 As shown, the detection device 1400 includes:

[0174] The first acquisition module 1401 is used to acquire an image of the electrode sheet before adhesive application, which is collected after the die-cutting process and before the adhesive application process.

[0175] The second acquisition module 1402 is used to acquire the image of the electrode sheet after the adhesive application process; wherein, there is a preset interval of image frame number between the frame number of the image before adhesive application and the frame number of the image after adhesive application, and the image data of the image before adhesive application and the image data of the image after adhesive application are aligned.

[0176] The first determining module 1403 is used to determine, based on the image before adhesive application, the first distance information between the edge of the film area near the die-cutting edge on the electrode sheet and the die-cutting edge.

[0177] The second determining module 1404 is used to determine, based on the image after adhesive application, the second distance information between the edge of the adhesive application area near the film area on the electrode sheet and the die-cutting edge.

[0178] The third determining module 1405 is used to determine the adhesive application distance information in the electrode width direction based on the first distance information and the second distance information.

[0179] In some embodiments, the image before adhesive application is captured by a first camera, and the image after adhesive application is captured by a second camera; the images captured by the first camera and the second camera are captured at the same frequency and are triggered by the same encoder; the first pulse number is equal to the second pulse number, wherein the first pulse number is the number of pulses emitted by the encoder corresponding to the electrode travel distance between the center lines of the first camera and the second camera; the second pulse number is the number of pulses emitted by the encoder corresponding to the image captured at a preset interval of image frames.

[0180] In some embodiments, the second acquisition module is further configured to acquire, based on the frame number of the image before adhesive application, an image of the electrode after adhesive application captured by the second camera at a preset interval of image frames; or, the first acquisition module is further configured to acquire, based on the frame number of the image after adhesive application, an image of the electrode before adhesive application captured by the first camera at a preset interval of image frames.

[0181] In some embodiments, the first determining module is further configured to determine the edge of the film area near the die-cutting edge on the electrode sheet and the die-cutting edge based on the image before adhesive application; and to determine the vertical distance information between the edge of the film area and the die-cutting edge as the first distance information;

[0182] The second determining module is also used to determine the die-cut edge of the electrode and the edge of the adhesive application area near the film area based on the image after adhesive application; and to determine the vertical distance information between the edge of the adhesive application area and the die-cut edge as the second distance information.

[0183] In some embodiments, the apparatus further includes: a setting module, configured to set multiple identical vertical coordinate points or horizontal coordinate points on the die-cut edge of the image before and after adhesive application, respectively;

[0184] The third determining module is also used to determine the difference between the second distance information and the first distance information for each same vertical or horizontal coordinate point as the adhesive application distance information in the electrode width direction of the adhesive application process.

[0185] In some embodiments, the first determining module is further configured to identify the edge of the film area and the die-cut edge on the electrode sheet based on the image before adhesive application; take pixel points on the edge of the film area and on the die-cut edge according to each pixel coordinate point in the preset set of pixel coordinate points to obtain a first set of pixel coordinate point pairs; and determine a first distance array based on each pixel coordinate point pair in the first set of pixel coordinate point pairs, wherein the first distance array includes multiple first distance information.

[0186] It should be noted that, in the embodiments of this application, if the above-mentioned method for detecting the adhesive size is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, or the part that contributes to the related technology, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, industrial control computer, etc.) to execute all or part of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memory (ROM), magnetic disks, or optical disks. Thus, the embodiments of this application are not limited to any specific hardware, software, or firmware, or any combination of hardware, software, and firmware.

[0187] This application also provides a computer device, including a memory, a processor, and a computer program stored in the memory. When the processor executes the computer program, it implements some or all of the steps in the above-described method for detecting the adhesive size.

[0188] This application also provides a computer-readable storage medium storing a computer program or instructions thereon. When executed by a processor, the computer program or instructions implement some or all of the steps in the above-described method for detecting the adhesive size. The computer-readable storage medium can be transient or non-transient.

[0189] This application also provides a computer program including computer-readable code, wherein when the computer-readable code is run in a computing device, the processor in the computing device executes some or all of the steps in the above-described method for detecting the adhesive size.

[0190] This application also provides a computer program product, including a computer program or instructions, which, when executed by a processor, implement some or all of the steps in the above-described method for detecting adhesive size. This computer program product can be implemented specifically through hardware, software, or a combination thereof. In some embodiments, the computer program product is specifically embodied in a computer storage medium; in other embodiments, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0191] It should be noted that the descriptions of the various embodiments above tend to emphasize the differences between them, while their similarities or commonalities can be referenced interchangeably. The descriptions of the above embodiments of the device, storage medium, computer program, and computer program product are similar to the descriptions of the above-described method embodiments for detecting adhesive size, and have similar beneficial effects to the method embodiments. For technical details not disclosed in the embodiments of the device, storage medium, computer program, and computer program product of this application, please refer to the descriptions of the method embodiments of this application for understanding.

[0192] This application provides a hardware entity for a computer device, such as... Figure 15 As shown, the hardware entities of the computer device 1500 include: a processor 1501 that typically controls the overall operation of the computer device 1500; a communication interface 1502 that enables the computer device to communicate with other terminals or servers via a network; and a memory 1503 configured to store instructions and applications executable by the processor 1501, and also to cache data to be processed or already processed (e.g., image data, audio data, voice communication data, and video communication data) to be processed by the processor 1501 and various modules in the computer device 1500, which can be implemented using flash memory or random access memory (RAM). Data transfer between the processor 1501, the communication interface 1502, and the memory 1503 can be performed via a bus 1504.

[0193] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above steps / processes do not imply a sequential order of execution; the execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above embodiments of this application are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0194] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0195] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components may be combined, or integrated into another system, or some features may be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0196] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this application may all be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the integrated unit may be implemented in hardware or in a combination of hardware and software functional units.

[0197] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A method for detecting the size of adhesive tape, characterized in that, The detection method includes: Obtain an image of the electrode sheet before adhesive application, taken after the die-cutting process and before the adhesive application process; Acquire images of the electrode sheet after the adhesive application process; wherein there is a preset interval of image frame number between the frame number of the image before adhesive application and the frame number of the image after adhesive application, and the image data of the image before adhesive application and the image data of the image after adhesive application are aligned; Based on the image before adhesive application, determine the first distance information between the edge of the film area near the die-cut edge on the electrode and the die-cut edge; Based on the image after adhesive application, determine the second distance information between the edge of the adhesive application area near the film area on the electrode sheet and the die-cut edge; Based on the first distance information and the second distance information, the adhesive application distance information in the electrode width direction of the adhesive application process is determined; Specifically, determining the adhesive application distance information in the electrode width direction based on the first distance information and the second distance information includes: The difference between the first distance information and the second distance information is used to obtain the adhesive application distance information in the electrode width direction of the adhesive application process.

2. The detection method according to claim 1, characterized in that, The image before the adhesive is applied is captured by the first camera, and the image after the adhesive is applied is captured by the second camera. The first camera and the second camera acquire images at the same frequency and are triggered to take pictures using the same encoder; the first pulse number is equal to the second pulse number, wherein the first pulse number is the number of pulses emitted by the encoder corresponding to the electrode travel distance between the center lines of the first camera and the second camera, and the second pulse number is the number of pulses emitted by the encoder corresponding to the number of image frames acquired at the preset interval.

3. The detection method according to claim 1, characterized in that, The step of acquiring the post-adhesion image of the electrode sheet after the adhesive application process includes: acquiring the post-adhesion image of the electrode sheet after the adhesive application process captured by the second camera according to the frame number of the pre-adhesion image and the preset interval image frame number. or, The acquisition of the electrode sheet before adhesive application, which is captured after the die-cutting process and before the adhesive application process, includes: acquiring the electrode sheet before adhesive application captured by the first camera according to the frame number of the image after adhesive application and the preset interval image frame number.

4. The detection method according to claim 1, characterized in that, Based on the image before adhesive application, determine the first distance information between the edge of the film area near the die-cut edge on the electrode and the die-cut edge, including: Based on the image before adhesive application, the edge of the film area near the die-cut edge on the electrode sheet and the die-cut edge are determined. The vertical distance information between the edge of the film area and the die-cut edge is determined as the first distance information; Based on the image after adhesive application, determine the second distance information between the edge of the adhesive application area near the film area on the electrode sheet and the die-cut edge, including: Based on the image after adhesive application, the die-cut edge of the electrode and the edge of the adhesive application area near the film area are determined. The vertical distance information between the edge of the adhesive application area and the die-cut edge is determined as the second distance information.

5. The detection method according to any one of claims 1 to 4, characterized in that, After identifying the die-cut edge, the method further includes: Multiple identical vertical or horizontal coordinate points are set on the die-cut edges of the images before and after applying the adhesive, respectively. Based on the first distance information and the second distance information, determining the adhesive application distance information in the electrode width direction of the adhesive application process includes: For each of the same vertical coordinate points or horizontal coordinate points, the difference between the second distance information and the first distance information is determined as the adhesive application distance information of the adhesive application process in the electrode width direction.

6. The detection method according to any one of claims 1 to 4, characterized in that, The method further includes: Based on the image before adhesive application, determine the first distance information between the edge of the film area near the die-cut edge on the electrode and the die-cut edge, including: Based on the image before adhesive application, the edge of the film area and the die-cut edge on the electrode sheet near the die-cut edge are identified; According to each pixel coordinate point in the preset set of pixel coordinate points, pixel points are taken on the edge of the film area and on the die-cutting edge respectively to obtain the first set of pixel coordinate point pairs; Based on each pixel coordinate pair in the first pixel coordinate pair set, a first distance array is determined, and the first distance array includes multiple first distances.

7. A system for detecting the size of adhesive tape, characterized in that, include: Two shooting stations, including a first shooting station and a second shooting station set sequentially along the electrode conveying direction; The adhesive application station is located between the first shooting station and the second shooting station; The two shooting stations each include a camera, which is used to take pictures of the electrode sheet before or after adhesive application to obtain an image before adhesive application or an image after adhesive application. The image before adhesive application is an image of the electrode sheet taken after the die-cutting process and before the adhesive application process, and the image after adhesive application is an image of the electrode sheet taken after the adhesive application process. A vision-based host computer is used to acquire images before and after adhesive application; wherein, there is a preset interval of image frame number between the frame number of the image before adhesive application and the frame number of the image after adhesive application, and the image data of the image before adhesive application and the image data of the image after adhesive application are aligned; based on the image before adhesive application, a first distance information between the edge of the film area near the die-cutting edge on the electrode sheet and the die-cutting edge is determined; Based on the image after adhesive application, a second distance is determined between the edge of the adhesive application area near the film area on the electrode and the die-cut edge; the difference between the first distance information and the second distance information is calculated to obtain the adhesive application distance information of the adhesive application process in the width direction of the electrode.

8. The detection system according to claim 7, characterized in that, The detection system also includes: Multiple conveying rollers for conveying the electrode sheets, the multiple conveying rollers including at least a first conveying roller and a second conveying roller; wherein, the first shooting station is arranged corresponding to the first conveying roller, and the second shooting station is arranged corresponding to the second conveying roller; The encoder is used to trigger the first camera at the first shooting station and the second camera at the second shooting station to take pictures simultaneously. Wherein, the first pulse number is equal to the second pulse number, the first pulse number is the number of encoder pulses corresponding to the electrode travel distance between the center lines of the first camera and the second camera, and the second pulse number is the number of encoder pulses corresponding to the number of image frames acquired at the preset interval.

9. The detection system according to claim 8, characterized in that, The plurality of conveying rollers further includes a third conveying roller and a fourth conveying roller, wherein: The third conveying roller is symmetrically arranged with respect to the first conveying roller along the width direction of the electrode sheet; The fourth conveying roller is symmetrically arranged with respect to the second conveying roller along the width direction of the electrode sheet; The at least two shooting stations also include a third shooting station and a fourth shooting station, wherein the third shooting station is configured corresponding to the third conveyor roller; and the fourth shooting station is configured corresponding to the fourth conveyor roller.

10. The detection system according to claim 8 or 9, characterized in that, The first pulse count is greater than the pulse count accumulated when acquiring one frame of image.

11. A device for detecting the size of adhesive tape, characterized in that, The detection device includes: The first acquisition module is used to acquire the image of the electrode sheet before adhesive application, which is collected after the die-cutting process and before the adhesive application process. The second acquisition module is used to acquire the image of the electrode sheet after adhesive application, which is collected after the adhesive application process; wherein, there is a preset interval of image frame number between the frame number of the image before adhesive application and the frame number of the image after adhesive application, and the image data of the image before adhesive application and the image data of the image after adhesive application are aligned. The first determining module is used to determine, based on the image before adhesive application, a first distance information between the edge of the film area near the die-cut edge on the electrode sheet and the die-cut edge; The second determining module is used to determine, based on the image after adhesive application, a second distance information between the edge of the adhesive application area near the film area on the electrode sheet and the die-cut edge; The third determining module is used to obtain the adhesive application distance information in the electrode width direction by subtracting the first distance information from the second distance information.

12. A computer device comprising a memory, a processor, and a computer program stored in the memory, characterized in that, When the processor executes the computer program, it implements the steps in the method for detecting the adhesive size according to any one of claims 1 to 6.

13. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, When the computer program or instructions are executed by the processor, they implement the steps in the method for detecting the adhesive size according to any one of claims 1 to 6.

Images