Cathode sheet detection system and method

Abstract

The present application relates to the technical field of visual detection, and discloses a cathode sheet detection system and method. The cathode sheet detection system comprises a photographing device, light sources, and a superordinate computer. The light sources are used for lighting a cathode sheet, wherein the cathode sheet comprises a processed detection area, and included angles between light beam directions of the light sources and the cathode sheet is less than a preset angle. The photographing device is used for capturing a scan image containing the cathode sheet. The superordinate computer is used for performing edge detection on the scan image, wherein edge detection is performed on the scan image to identify the edge of the processed detection area in the scan image. The processed detection area is obtained by processing an unprocessed detection area, and low-angle lighting is used to light the processed detection area and the unprocessed detection area, so that images of the processed detection area and the unprocessed detection area are different, thereby effectively distinguishing the image edge of an unprocessed material and the image edge of a processed material, and implementing the detection of the image edge of the processed material.

Description

Cathode sheet detection system and method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 8, 2023, with application number 202311157576.4 and invention name “Cathode Sheet Detection System and Method”, the entire contents of which are incorporated by reference into the application. Technical Field

[0002] The present application relates to the technical field of visual inspection. Background Art

[0003] At present, visual inspection is generally used to inspect cathode sheets. However, in this case, only rough inspection can be performed, and further inspection of the edges of the cathode sheets is required. However, after the material is processed, the image obtained by visual inspection includes the image of the material and the image of the material after processing. Since the unprocessed material and the processed material are made of the same material, when the images of the unprocessed material and the processed material exist at the same time, due to the characteristics of the material itself in reflecting light, the image colors of the unprocessed material and the processed material are very similar, and they cannot be effectively distinguished, which is prone to misjudgment. Technical issues

[0004] The invention aims to solve the existing problem that the image edges of unprocessed materials and processed materials cannot be effectively distinguished. Technical Solutions

[0005] In a first aspect, the present application provides a cathode film detection system, the cathode film detection system comprising: a shooting device, a light source, and a host computer;

[0006] The light source is used to illuminate the cathode sheet, wherein the cathode sheet includes a processed detection area, and the angle between the light beam direction of the light source and the cathode sheet is lower than a preset angle;

[0007] The photographing device is used to obtain a scanned image containing the cathode film,

[0008] The host computer is used to perform edge detection on the scanned image, wherein the scanned image is used to perform edge detection and identify the edge of the processed detection area in the scanned image.

[0009] In the technical solution of the embodiment of the present application, since the processed detection area is obtained by processing the unprocessed detection area, the processed detection area and the unprocessed detection area are illuminated by low-angle lighting, so that the images of the processed detection area and the unprocessed detection area are different, thereby effectively distinguishing the image edges of the unprocessed material and the processed material, and realizing the detection of the image edges of the processed material.

[0010] In some embodiments, the angle between the light beam direction of the light source and the cathode plate is 15° to 35°, so that the light source can fully cover the cathode plate, thereby realizing detection of the cathode plate and improving detection accuracy.

[0011] In some embodiments, the angle between the light beam direction of the light source and the cathode plate is 20° to 30°. Since the angle between the light beam direction of the light source and the cathode plate is 15° to 35°, the image taken when the angle between the light beam direction of the light source and the cathode plate is 15° is still unclear at the edge position. Therefore, the angle between the light beam direction of the light source and the cathode plate is adjusted to 20° to 30° to improve the accuracy of detection.

[0012] In some embodiments, the camera includes a line scan camera, which is parallel to the cathode sheet. Because the seam welding equipment operates at high speed and continuously, an area array camera, while maintaining the same accuracy, cannot achieve a fast acquisition speed due to limitations on the bandwidth of the data transmission line. Furthermore, the brightness of the light source used with area array cameras is generally low, which prevents them from reducing exposure time to a very low value. Consequently, captured images may exhibit a certain amount of smear, affecting the algorithm's ability to capture and detect weld mark boundaries. A line scan camera can perform high-speed, line-by-line scanning at a frequency consistent with the operating speed of the seam welding equipment, thereby improving the accuracy of captured images.

[0013] In some embodiments, the system further includes a mounting bracket, wherein the camera and the light source are both mounted on the mounting bracket. The light source is positioned on the side of the cathode sheet, and the camera is positioned directly opposite the cathode sheet. The camera is configured to receive reflected light from the cathode sheet when the light source illuminates the cathode sheet, and to generate an image based on the reflected light to obtain a scanned image of the cathode sheet. The camera and the light source are both mounted on the same mounting bracket. When the position of the camera is adjusted, the light source can be adjusted synchronously, thereby improving detection efficiency.

[0014] In some embodiments, the mounting bracket is movably mounted along a first direction, which is different from the shooting direction of the camera. Since the camera and the light source are fixed to the same bracket, the mounting bracket is movably mounted along the first direction, and a sliding member can be provided to adjust the position of the camera and the light source. Since the field of view of the line scan camera is fixed, initial adjustments do not require subsequent changes. To accommodate materials with different weld print spacings, the camera only needs to be translated across the width of the material via a sliding member, improving shooting flexibility. Furthermore, fixing the line scan camera and light source to the same bracket ensures that the image quality remains unchanged, improving the accuracy of the captured image.

[0015] In some embodiments, the cathode sheet includes an unprocessed inspection area, a processed inspection area, a first material, and a second material, wherein the diffuse reflectivity of the first material is greater than that of the second material, and the diffuse reflectivity of the processed inspection area is greater than that of the unprocessed inspection area. The camera is configured to receive diffuse light from the processed inspection area, the first material, and the second material, and to generate an image based on the diffuse light to obtain a scanned image of the cathode sheet. This results in a black and white effect based on the light-sensing properties of the materials, facilitating differentiation.

[0016] In some embodiments, the unprocessed detection area includes aluminum foil, the processed detection area includes aluminum foil printed with a weld mark, the first material includes a material coated with a gray coating, and the second material includes a material coated with a black coating, thereby determining different diffuse reflectances through the characteristics of the material itself to achieve effective distinction between different detection areas.

[0017] In some embodiments, the cathode sheet detection system further comprises: a conveying device, a processing device, and a control device;

[0018] The conveying device is used to transport the target material;

[0019] The processing device is arranged on the transport path of the target material transported by the conveying device;

[0020] The processing device is configured to process the target material to obtain a processed cathode sheet upon receiving a processing instruction from the control device. The material is directly processed by the processing device along a material transport path to obtain the processed cathode sheet, thereby improving material processing efficiency.

[0021] In some embodiments, the processing device includes a seam welding device;

[0022] The roll welding device is configured to roll weld the target material upon receiving a roll welding instruction from the control device, thereby obtaining a roll-welded cathode sheet. Since the cathode substrate of this embodiment is not aluminum foil but AP material, it cannot be normally cut into tabs for welding using a laser during the die-cutting process. Therefore, after the AP material of the initial cathode substrate is aluminized, two layers of aluminum foil, one wide and one narrow, are used to sandwich the AP material. The aluminum foils on both sides of the AP are then penetrated and welded together. The wide aluminum foil can be used for die-cutting to produce normal tabs, thereby realizing a new process in which the AP material is welded together by roll welding and then produced by die-cutting to produce normal tabs. AP material replaces aluminum foil, thereby achieving the purpose of reducing costs.

[0023] In some embodiments, the cathode film detection system further includes: an encoding device, the encoding device being electrically connected to the photographing device;

[0024] The encoding device is arranged on the rotating shaft of the transmission device and rotates along with the rotating shaft;

[0025] The encoding device is used to output a pulse signal according to the rotation angle, and send the pulse signal to the shooting device, driving the shooting device to shoot the cathode film at the shooting frequency corresponding to the pulse signal, so that the shooting device can obtain a scanned image of the cathode film. The angle acquisition device is installed on the rotating shaft of the material, and the cathode film drives the rotating shaft and the angle acquisition device to rotate together during the movement. The angle acquisition device can output a pulse signal every time it rotates a certain angle, thereby driving the shooting frequency of the shooting device and the movement speed of the cathode film to be unified, ensuring that the image can be output stably at different speeds and one-to-one corresponding to the cathode film. In some embodiments, a spot check object is provided on the rotating shaft, and the spot check object and the cathode film are both located within the shooting field of view of the shooting device;

[0026] The light source is used to illuminate the inspection object;

[0027] The photographing device is further configured to generate a scanned image containing an image of the object to be inspected upon receiving reflected light from the object to be inspected and the cathode film, and to send the scanned image containing the image of the object to be inspected to the host computer;

[0028] The host computer is also used to match the inspection object image in the scanned image and output an alarm signal if the detection result is abnormal. The inspection object automates the inspection process and automatically completes the inspection during normal inspection. There is no need to worry about employees missing inspections due to subjective reasons, and there is no need to perform regular inspection operations and increase employee workload.

[0029] In some embodiments, the inspection object includes film, which has excellent contrast clarity, minimal error due to external interference, and high precision, thereby improving the accuracy of inspection.

[0030] In some embodiments, the cathode film detection system further includes an interactive device, the interactive device being communicatively connected to the host computer; the host computer being further configured to send the alarm signal to the interactive device; and the interactive device being configured to issue an alarm alert based on the alarm signal. By providing the interactive device and providing an abnormality alert through the interactive device, the real-time nature of abnormality handling is improved.

[0031] In some embodiments, the host computer is further configured to display the edge detection results of the scanned image and issue an alarm if the edge detection result is abnormal. The interactive device is further configured to obtain parameter information input by the user and adjust the edge detection result based on the parameter information. The interactive device allows for real-time adjustment of the edge detection results, thereby improving the flexibility and visualization of data processing.

[0032] In some embodiments, the cathode film detection system further includes: a correction device, the correction device is communicatively connected to the control device, and the control device is communicatively connected to the host computer; the host computer is further configured to analyze the edge detection result to obtain adjustment information of the correction device, and send the adjustment information to the correction device.

[0033] The correction device is used to adjust the position according to the adjustment information to adjust the processing size of the processing device. The processing size of the processing device on the production line can be adjusted in real time by the correction device of the lower computer, thereby realizing the automation and refined control of the production line.

[0034] In some embodiments, the host computer is further configured to send the adjustment information to the control device;

[0035] The control device is configured to generate an adjustment signal based on the adjustment information and transmit the adjustment signal to the correction device; the correction device is configured to adjust the position of the correction device based on the adjustment signal to adjust the processing size of the processing device. In this embodiment, the control device enables signal transmission between the host computer and the correction device, thereby improving the effective control of various devices on the production line.

[0036] In some embodiments, the cathode film inspection system further includes a lens positioned between the cathode film and the camera; the lens is configured to refract and focus light reflected from the cathode film and then project it onto a photosensitive element of the camera to obtain a scanned image of the cathode film. Positioning the lens between the cathode film and the camera allows for more efficient projection of light reflected from the cathode film onto the photosensitive element of the camera, thereby improving image acquisition accuracy.

[0037] In some embodiments, the cathode sheet further includes an unprocessed detection area and a first material; the host computer is further configured to obtain an image grayscale value of each pixel in the scanned image; determine a grayscale difference between each pixel and an adjacent pixel based on the image grayscale value of each pixel; and fit pixels corresponding to grayscale differences greater than a preset pixel threshold to obtain boundary lines of the unprocessed detection area, the processed detection area, and the first material in the scanned image. Edge detection results are obtained based on the boundary lines of the unprocessed detection area, the processed detection area, and the first material in the scanned image. The grayscale difference between pixels is used as a reference factor for determining the boundary line, thereby improving the accuracy of boundary line recognition.

[0038] In some embodiments, the host computer is further used to determine the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material in the scanned image based on the pixel points corresponding to the grayscale difference greater than the preset pixel threshold and the arrangement positions of the unprocessed detection area, the processed detection area, and the first material in the cathode film, and obtain the edge detection result based on the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material in the scanned image.

[0039] The boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material are determined based on the arrangement positions of the unprocessed detection area, the processed detection area, and the first material in the cathode sheet. Because the arrangement positions of the unprocessed detection area, the processed detection area, and the first material are fixed, the boundary line of the unprocessed detection area, the first boundary line of the processed detection area, and the boundary line of the first material are preliminarily determined based on the arrangement positions of the materials without the need for complex algorithmic calculations, thereby improving the efficiency of material edge recognition.

[0040] In some embodiments, the boundary line of the first material in the scanned image includes a first boundary line of the first material; the host computer is further configured to determine an auxiliary area of ​​the first material based on the width of the material corresponding to the unprocessed detection area and the boundary line of the unprocessed detection area, adjust the first boundary line of the first material based on the auxiliary area of ​​the first material to obtain a target first boundary line of the first material, and obtain an edge detection result based on the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the target boundary line of the first material in the scanned image. The auxiliary first boundary line is determined based on parameters of the material itself, and the boundary line of the first material is obtained using the auxiliary first boundary line, thereby improving the accuracy of boundary line recognition.

[0041] In some embodiments, the boundary line of the processed detection zone includes a first boundary line and a second boundary line of the processed detection zone; the host computer is further configured to determine an auxiliary area of ​​the processed detection zone based on the width of the processed detection zone and the first boundary line of the processed detection zone, adjust the second boundary line of the processed detection zone based on the auxiliary area of ​​the processed detection zone to obtain a target second boundary line of the processed detection zone, and obtain an edge detection result based on the boundary line of the unprocessed detection zone, the first boundary line of the processed detection zone, and the target second boundary line of the first material in the scanned image. The auxiliary area is determined based on the parameters of the processed detection zone itself, and the boundary line of the processed detection zone is obtained through the auxiliary area, thereby improving the accuracy of boundary line recognition.

[0042] In a second aspect, the present application provides a cathode sheet detection method, the cathode sheet detection method comprising:

[0043] Driving a light source to illuminate a cathode sheet, wherein the cathode sheet includes a processed detection area, and an angle between a light beam direction of the light source and the cathode sheet is less than a preset angle;

[0044] The shooting device is controlled to obtain a scanned image containing the cathode film image, and the scanned image is transmitted to a host computer so that the host computer performs edge detection on the scanned image and identifies the edge of the processed detection area in the scanned image.

[0045] In the technical solution of the embodiment of the present application, since the processed detection area is obtained by processing the unprocessed detection area, the processed detection area and the unprocessed detection area are illuminated by low-angle lighting, so that the images of the processed detection area and the unprocessed detection area are different, thereby effectively distinguishing the image edges of the unprocessed material and the processed material, and realizing the detection of the image edges of the processed material.

[0046] In some embodiments, the cathode sheet detection method further includes:

[0047] When the edge detection result is abnormal, obtaining the adjustment information sent by the host computer;

[0048] The adjustment information is sent to the correction device, which adjusts the position of the correction device according to the adjustment information to adjust the processing size of the processing device. The correction device of the lower computer adjusts the processing size of the processing device on the production line in real time, realizing the automation and refined control of the production line.

[0049] In a third aspect, the present application provides a cathode sheet detection method, the cathode sheet detection method comprising:

[0050] Illuminating the cathode sheet with a light source, wherein the cathode sheet includes a processed detection area, and an angle between a light beam direction of the light source and the cathode sheet is less than a preset angle;

[0051] Acquiring a scanned image containing the cathode film by a photographing device;

[0052] Edge detection is performed on the scanned image to identify edges of processed detection areas in the scanned image.

[0053] In the technical solution of the embodiment of the present application, since the processed detection area is obtained by processing the unprocessed detection area, the processed detection area and the unprocessed detection area are illuminated by low-angle lighting, so that the images of the processed detection area and the unprocessed detection area are different, thereby effectively distinguishing the image edges of the unprocessed material and the processed material, and realizing the detection of the image edges of the processed material.

[0054] In some embodiments, the cathode sheet detection method includes:

[0055] If the edge detection result is abnormal, the system analyzes the edge detection result to obtain adjustment information for the correction device. This information is then sent to the correction device, which adjusts its position based on the adjustment information to adjust the processing size of the processing device. The correction device on the lower computer adjusts the processing size of the processing device on the production line in real time, achieving automated and refined control of the production line.

[0056] In some embodiments, the cathode sheet further includes an unprocessed detection area and a first material;

[0057] The performing edge detection on the scanned image to identify edges of an unprocessed detection area and a processed detection area in the scanned image includes:

[0058] Obtaining the image grayscale value of each pixel in the scanned image;

[0059] Determine the grayscale difference between each pixel and an adjacent pixel according to the image grayscale value of each pixel;

[0060] The pixel points corresponding to grayscale differences greater than a preset pixel threshold are fitted to obtain the boundary lines of the unprocessed inspection area, the processed inspection area, and the first material in the scanned image. The grayscale differences between the pixel points are used as a reference factor for determining the boundary lines, thereby improving the accuracy of boundary line recognition.

[0061] In some embodiments, the cathode sheet detection method further includes:

[0062] The boundary lines of the unprocessed detection area, the boundary lines of the processed detection area, and the boundary lines of the first material in the scanned image are determined based on the pixel points corresponding to grayscale differences greater than a preset pixel threshold and the arrangement positions of the unprocessed detection area, the processed detection area, and the first material on the cathode sheet. Because the arrangement positions of the unprocessed detection area, the processed detection area, and the first material are fixed, the boundary lines of the unprocessed detection area, the first boundary lines of the processed detection area, and the boundary lines of the first material are preliminarily determined based on the arrangement positions of the materials, without the need for complex calculation algorithms, thereby improving the efficiency of material edge recognition.

[0063] In some embodiments, the boundary line of the first material in the scanned image includes a first boundary line of the first material, and the cathode film detection method further includes: determining an auxiliary area of ​​the first material based on the width of the material corresponding to the unprocessed detection area and the boundary line of the unprocessed detection area; adjusting the first boundary line of the first material based on the auxiliary area of ​​the first material to obtain a target first boundary line of the first material. Determining the auxiliary first boundary line based on parameters of the material itself and obtaining the boundary line of the first material using the auxiliary first boundary line improves the accuracy of boundary line recognition.

[0064] In some embodiments, the boundary line of the processed inspection area includes a first boundary line and a second boundary line of the processed inspection area, and the cathode sheet inspection method further includes:

[0065] An auxiliary region of the processed detection zone is determined based on the width of the processed detection zone and the first boundary line of the processed detection zone. The second boundary line of the processed detection zone is adjusted based on the auxiliary region to obtain a target second boundary line of the processed detection zone. The auxiliary region is determined based on the parameters of the processed detection zone itself, and the boundary line of the processed detection zone is obtained from the auxiliary region, thereby improving the accuracy of boundary line recognition.

[0066] In some embodiments, the cathode sheet detection method further includes:

[0067] A boundary distance between the target second boundary line of the processed inspection area and the target first boundary line of the first material is obtained; if the boundary distance exceeds a distance threshold, a first alarm signal is output. Material inspection is performed based on the boundary distance, and if the distance threshold is exceeded, the result is output in the form of various alarm signals to remind the operator to perform inspection and maintenance, thereby effectively notifying the operator of abnormalities.

[0068] In some embodiments, the cathode sheet detection method further includes:

[0069] The width of the processed inspection area is determined based on the first boundary line of the processed inspection area and the target second boundary line of the processed inspection area. If the width of the processed inspection area is inconsistent with the standard processing width, a second alarm signal is output. If the width of the processed inspection area is abnormal, the result is output in the form of various alarm signals to remind the operator to perform inspection and maintenance, thereby effectively notifying the operator of the abnormality.

[0070] In some embodiments, the cathode sheet detection method further includes:

[0071] The number of abnormal images of the cathode sheet whose width of the processed inspection area is inconsistent with the standard processing width is counted; if the number of abnormal images exceeds a threshold, a third alarm signal is output. If the width of the processed inspection area exceeds a preset number, the result is output, which can be various forms of alarm signals, to remind the operator to inspect and maintain, thereby effectively notifying the operator of the abnormality.

[0072] In some embodiments, the boundary line of the first material in the scanned image includes a second boundary line of the first material, and the cathode film detection method further includes:

[0073] The width of the first material is determined based on the target first boundary line and the second boundary line of the first material. If the width of the first material is inconsistent with the standard material width, a fourth alarm signal is output. If the width of the first material is abnormal, the result is output in the form of various alarm signals to remind the operator to perform inspection and maintenance, thereby effectively notifying the operator of the abnormality.

[0074] In some embodiments, the cathode sheet detection method further includes:

[0075] Dividing the scanned image into regions to obtain images of each region;

[0076] Screening the images of each region according to the characteristics of the film;

[0077] When there is a region with film features, comparing the width of the film image in the region with film features with a standard film width;

[0078] When the difference between the width of the film image and the standard film width exceeds a width threshold, a fifth alarm signal is output.

[0079] In the technical solution of the embodiment of the present application, when the film image is abnormal, the result is output, which can be various forms of alarm signals to remind the operator to check and maintain, thereby realizing effective reminder of the abnormality.

[0080] In some embodiments, the cathode sheet detection method further includes:

[0081] If no film feature area exists, a sixth alarm signal is output. If no film is detected, the result is output, which may be an alarm signal in various forms, to remind the operator to perform inspection and maintenance, thereby effectively reminding the operator of abnormalities. Beneficial effects

[0082] Since the processed inspection area is obtained by processing the unprocessed inspection area, the processed inspection area and the unprocessed inspection area are illuminated by low-angle lighting, so that the images of the processed inspection area and the unprocessed inspection area are different, thereby effectively distinguishing the image edges of the unprocessed material and the processed material, and realizing the detection of the image edges of the processed material. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] FIG1 is a schematic front view of a roll welding material according to some embodiments of the present application;

[0084] FIG2 is a schematic structural diagram of a cathode sheet detection system according to some embodiments of the present application;

[0085] FIG3 is a schematic diagram of the angle between the light beam direction of the light source and the cathode plate in some embodiments of the present application;

[0086] FIG4 is a schematic diagram of the overall structure of a detection system according to some embodiments of the present application;

[0087] FIG5 a is a schematic diagram of solder before soldering in some embodiments of the present application;

[0088] FIG5 b is a schematic diagram of solder roll welding in some embodiments of the present application;

[0089] FIG6 is a cross-sectional view of materials according to some embodiments of the present application;

[0090] FIG7 is a schematic diagram of boundary line detection in some embodiments of the present application;

[0091] FIG8 is a schematic flow chart of a cathode sheet detection method according to some embodiments of the present application;

[0092] FIG9 is a front view of a camera for detecting a roll welding process according to some embodiments of the present application;

[0093] FIG10 is a side view of a camera for inspecting a roll welding process according to some embodiments of the present application;

[0094] FIG11 is an overall logic diagram of a cathode sheet detection method according to some embodiments of the present application;

[0095] FIG12 is a dimensional diagram of a film sheet according to some embodiments of the present application;

[0096] FIG13 is a schematic diagram of the inspection process of some embodiments of the present application.

[0097] The accompanying drawings in the specific implementation manner are as follows:

[0098] Camera 10, light source 20, host computer 30, cathode plate 40;

[0099] AP seam welding material 50, first material 60, second material 70, narrow aluminum foil 80, wide aluminum foil 90;

[0100] Processed inspection area 100, unprocessed inspection area 110, beam direction 120, aluminum foil 130, weld mark 140;

[0101] Target object 200, line scan camera 210, encoder 220, industrial computer 230, seam welding equipment 240,

[0102] Central control display 250 and deviation corrector 260. Modes for Carrying Out the Invention

[0103] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0104] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0105] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0106] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0107] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0108] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0109] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0110] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0111] At present, visual inspection is generally used to inspect cathode sheets. However, in this case, only rough inspection can be performed, and further inspection of the edges of the cathode sheets is required. However, after the material is processed, the image obtained by visual inspection includes the image of the material and the image of the material after processing. Since the unprocessed material and the processed material are made of the same material, when the images of the unprocessed material and the processed material exist at the same time, due to the characteristics of the material itself in reflecting light, the image colors of the unprocessed material and the processed material are very similar, and they cannot be effectively distinguished, which is prone to misjudgment.

[0112] In order to solve the existing problem that the image edges of unprocessed materials and processed materials cannot be effectively distinguished, since the processed detection area is obtained by processing the unprocessed detection area, the processed detection area and the unprocessed detection area are illuminated by low-angle lighting, so that the images of the processed detection area and the unprocessed detection area are different, thereby effectively distinguishing the image edges of unprocessed materials and processed materials, and realizing the detection of the image edges of processed materials. The battery cell disclosed in the embodiment of the present application can be used for electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0113] According to some embodiments of the present application, applied to the battery production process, in the traditional lithium battery production process, aluminum foil as the cathode substrate needs to be coated and die-cut to produce the tabs. After being wound into a core, the tab welding operation can be performed. However, in new lithium batteries, a new cathode substrate is used: not aluminum foil but AP material. AP material is a polymer material that can be transparent plastic. After the AP surface is aluminum-plated, it can replace aluminum foil as the cathode substrate. After gravure, it can be coated. However, the AP substrate is still plastic in nature, and the die-cutting process cannot normally use a laser to cut it into tabs for welding. In addition, the aluminum-plated layers on both sides of the AP are not connected to each other. In order to ensure that the aluminum-plated layers on both sides are conductive and can produce tabs, a new process has emerged: roll welding. This is to use two layers of aluminum foil, one wide and one narrow, to sandwich the AP material in the middle. The aluminum foil on both sides of the AP is penetrated and welded together. The wide aluminum foil can be used for die-cutting to produce normal tabs.

[0114] Since AP material is a new type of material, there is currently no cathode sheet detection method based on AP material. However, similar ultrasonic welding equipment exists in the post-process, and an area array camera is used with a flat shadowless light to take static vertical photos to detect the area and number of cathode weld marks.

[0115] Ultrasonic vision inspection uses an area scan camera with a flat shadowless light for static vertical photography. Area scan cameras are well suited for static photography, but the roll welding equipment operates at high speed and continuously. While maintaining the same accuracy, area scan cameras are limited by the bandwidth of the data transmission line and cannot achieve fast acquisition speeds. Furthermore, the brightness of the light sources used with area scan cameras is generally low, which means they cannot minimize exposure time. As a result, images exhibit a certain amount of smearing, which affects the algorithm's ability to capture and detect weld mark boundaries. Because the weld mark and the aluminum foil boundary are very similar in color and cannot be effectively distinguished, misjudgment is prone to occur. For example, in the front view of the roll weld material shown in Figure 1, the weld mark 140 and the aluminum foil boundary 130 have very similar colors.

[0116] At present, visual inspection is generally used to inspect cathode sheets. However, in this case, only rough inspection can be performed, and further inspection of the edges of the cathode sheets is required. However, after the material is processed, the image obtained by visual inspection includes the image of the material and the image of the material after processing. Since the unprocessed material and the processed material are made of the same material, when the images of the unprocessed material and the processed material exist at the same time, due to the characteristics of the material itself in reflecting light, the image colors of the unprocessed material and the processed material are very similar, and they cannot be effectively distinguished, which is prone to misjudgment.

[0117] This application addresses the problem that existing image edges of unprocessed materials and processed materials cannot be effectively distinguished. A cathode film detection system is proposed. As shown in FIG2 , the cathode film detection system includes: a camera 10 , a light source 20 , and a host computer 30 ;

[0118] The light source 20 is used to illuminate the cathode plate 40 , wherein the cathode plate 40 includes a processed detection area, and the angle between the light beam direction 120 of the light source 20 and the cathode plate 40 is lower than a preset angle.

[0119] In this embodiment, the processed inspection area is obtained by processing the material, and the area where the material is processed is the processed inspection area. The unprocessed inspection area can be the aluminum foil area, and the processed inspection area can be the weld mark. The aluminum foil is processed to obtain the weld mark. The processing method can be the roll welding method, and other methods can also be used. This embodiment does not limit this.

[0120] The preset angle may be 45°, and an angle lower than 45° is a low angle. The incident direction of the light source 20 is adjusted to the low angle to illuminate the cathode plate 40, and a scanned image is obtained based on the reflected light.

[0121] When roll welding aluminum foil, weld marks are created. Since roll welding is a rolling process based on ultrasonic vibration and frictional heating, the welder's welding head uses square, raised welding teeth and a flat base. This frictional vibration melts the metals on the upper and lower sides of the narrow aluminum foil, AP substrate, and wide aluminum foil, welding the multiple layers together. This process creates a square, concave weld mark on the narrow side of the foil, and an oval, raised weld mark on the wide side. The weld marks on the rolled foil are essentially the same color as the unrolled foil, making them indistinguishable under standard lighting and angles.

[0122] This example focuses on the shape of the weld mark. Since the weld mark is produced by ultrasonic welding with square welding teeth, the weld mark has concave and convex shapes on both the front and back sides of the material. For objects with concave and convex shapes, low-angle lighting can effectively highlight the material outline, forming an image with a completely opposite position to the non-weld mark position. The strong black and white contrast can facilitate algorithm recognition and edge detection.

[0123] The photographing device 10 is used to obtain a scanned image including an image of the cathode film 40 .

[0124] The photographing device 10 includes a line scan camera, and can also be other forms of photographing cameras. This embodiment does not impose any restrictions on this. The photographing device 10 captures images, and the captured images are transmitted to the host computer 30 for detection and analysis to obtain detection results. When the photographing device includes a line scan camera, the line scan camera is parallel to the direction of the cathode sheet. Since the roll welding equipment moves at high speed and continuously, the area array camera cannot achieve a fast acquisition speed under the same accuracy due to the bandwidth of the data transmission line. In addition, the brightness of the light source supporting the area array camera is generally low, which determines that the area array camera cannot reduce the exposure time to a very small value. Therefore, there will be a certain amount of ghosting in the captured image, which affects the algorithm's capture and detection of the weld mark boundary. The line scan camera can be used to perform high-speed line-by-line scanning at a certain frequency according to the operating speed of the roll welding equipment, thereby improving the accuracy of the captured image.

[0125] The host computer 30 is used to perform edge detection on the scanned image and identify the edge of the processed detection area in the scanned image.

[0126] The host computer 30 may be a terminal device, such as a computer, or other forms of business processing terminals, which are not limited in this embodiment. The host computer 30 performs edge detection on the scanned image to achieve detection of the cathode film 40 .

[0127] This embodiment uses low-angle lighting to illuminate the processed inspection area, thereby creating a difference in the image of the processed inspection area and other inspection areas, thereby effectively distinguishing the image edges of other inspection areas and the processed material, and realizing image edge detection of the processed material.

[0128] In some embodiments, optionally, the angle between the light beam direction of the light source 20 and the cathode plate 40 is 15° to 35°.

[0129] By irradiating the cathode sheet 40 at a low angle with the light source 20 , the light source 20 can fully cover the cathode sheet 40 , thereby realizing detection of the cathode sheet 40 and improving the accuracy of detection.

[0130] In some embodiments, optionally, the angle between the light beam direction of the light source 20 and the cathode plate 40 is 20° to 30°.

[0131] Since the angle between the light beam direction of the light source 20 and the cathode plate 40 is 15° to 35°, the image taken when the angle between the light beam direction of the light source 20 and the cathode plate 40 is 15° is still unclear at the edge position. Therefore, the angle between the light beam direction of the light source 20 and the cathode plate 40 is adjusted to 20° to 30° to improve the accuracy of detection.

[0132] In some embodiments, optionally, the angle between the beam direction of the light source 20 and the cathode plate 40 is adjusted to 25°. As shown in FIG3 , which is a schematic diagram of the angle between the beam direction 120 of the light source 20 and the cathode plate 40, the edge of the processed detection area in the image scanned by the light source 20 provided at a low angle of 25° is obviously clearer, which is more conducive to edge detection and improves the accuracy of detection.

[0133] This embodiment can be applied to a detection system, wherein the cathode sheet detection system further includes: a conveying device, a processing device, and a control device; the conveying device is configured to transport target materials; the processing device is located on a transport path of the target materials transported by the conveying device; and the processing device is configured to process the target materials upon receiving a processing instruction from the control device to obtain processed cathode sheets. By directly processing the target materials along the material transport path through the processing device, the processed cathode sheets are obtained, thereby improving material processing efficiency.

[0134] In some embodiments, the processing device includes a roll welding device; the roll welding device is configured to roll weld the target material upon receiving a roll welding instruction from the control device to produce a roll-welded cathode sheet. Because the cathode substrate in this embodiment is not aluminum foil but rather AP material, it cannot be laser-cut into tabs for welding during the die-cutting process. Therefore, the AP material of the initial cathode substrate is aluminized, and then two layers of aluminum foil, one wide and one narrow, are used to sandwich the AP material. The aluminum foil on both sides of the AP is then welded through the AP. The wide aluminum foil can be used for die-cutting to produce normal tabs, thereby realizing a new process in which the AP material is welded together by roll welding, and then normal tabs are produced by die-cutting. AP material replaces aluminum foil, thereby achieving the purpose of reducing costs.

[0135] In some embodiments, the cathode film detection system further includes: an encoding device electrically connected to the photographing device;

[0136] The encoding device is mounted on the rotating shaft of the conveyor and rotates with it. The encoding device is used to output a pulse signal based on the rotation angle and transmit the pulse signal to the camera, which drives the camera to capture the cathode film at a frequency corresponding to the pulse signal, thereby enabling the camera to obtain a scanned image of the cathode film. The angle acquisition device is mounted on the rotating shaft of the material, driving the rotating shaft and the angle acquisition device to rotate together as the cathode film moves. The angle acquisition device can output a pulse signal at each rotation angle, thereby aligning the camera's capture frequency with the cathode film's movement speed, ensuring stable image output at different speeds and a one-to-one correspondence with the cathode film.

[0137] As shown in Figure 4, the detection system includes a target object 200, a line scan camera 210, and an industrial computer 230. The industrial computer 230 includes a core computing model, a central control display 250, a roll welding device 240, a deflection corrector 260, and an encoder 220. Among them, the roll welding device 240 is a roll welding device, the encoder 220 is an encoding device, and the deflection corrector 260 is a deflection correcting device.

[0138] Target object 200 is the cathode material produced by a seam welder. As shown in Figure 5a, before welding, side A consists of narrow aluminum foil 80, side B consists of wide aluminum foil 90, and AP 50 is sandwiched between the two surfaces. The material also includes first material 60 and second material 70. As shown in Figure 5b, after seam welding, side A consists of narrow aluminum foil 80 with a concave weld mark, side B consists of wide aluminum foil 90 with a concave weld mark, and AP is sandwiched between the two surfaces, which is generally invisible. The material also includes an unprocessed inspection area 110 and a processed inspection area 100. The seam welding camera uses a linear light source 20 parallel to the weld mark, with a low-angle lighting of approximately 25° between the light source 20 and the seam-welded material. This creates a clear outline for areas with height differences, such as the concave and convex weld marks and the edges of the aluminum foil.

[0139] The line scan camera 210 is a device that can convert optical signals into ordered electrical signals. Its characteristic is that it can scan line by line at a high speed according to a certain frequency according to the operating speed of the device, and finally form a complete image.

[0140] The industrial computer 230 is a reinforced and enhanced personal computer, which is usually specially designed to be reinforced, dustproof, moisture-proof, corrosion-proof, and radiation-proof. It can operate reliably in an industrial environment as an industrial controller. As an image processing terminal in the system, it has strong input and output functions, can be equipped with various peripheral intelligent devices, and play a role of mutual connection. It has a high degree of freedom and can adapt to various operating systems to meet the needs of various development languages ​​​​for the operation of host computer 30 software.

[0141] The central control display 250 organizes and summarizes the device processing results, arranges and displays them after graphical operations, and interacts with user operations on the front-end interface.

[0142] The roll welding device 240 is the main component of the roll welding machine and is primarily responsible for the roll welding operation. It welds the AP50 with the narrow aluminum foil 80 and the wide aluminum foil 90, performing the roll welding process on the solder and producing the weld mark. The roll welding device 240 is equipped with an adjustment mechanism for adjusting the roll welding position and size of the roll welding device 240 according to the adjustment instructions from the host computer 30. This adjustment can improve the flexibility of the roll welding process. The deflection corrector 260 is the left-right adjustment mechanism of the roll welding device 240. Based on the processing results fed back by the CCD system, it calculates the current position of the roll welding device 240 in real time and makes timely left-right adjustments to ensure that the welding position and size are within a reasonable range.

[0143] The encoder 220 is installed on the rotating shaft of the material and is provided by the roll welding equipment 240. After roll welding, the material drives the rotating shaft and the encoder 220 to rotate together during the movement. The encoder 220 can output a pulse signal every time it rotates a certain angle, thereby driving the line scan camera 210 to unify the shooting frequency and material movement speed, ensuring that the image can be output stably at different speeds and corresponds one-to-one with the material after roll welding.

[0144] According to some embodiments of the present application, optionally, as shown in the material cross-section diagram of Figure 6, the cathode sheet 40 includes an unprocessed detection area 110, a processed detection area 100, a first material 60 and a second material 70 arranged along a first direction, wherein the image grayscale value corresponding to the unprocessed detection area 110 is smaller than the image grayscale value corresponding to the processed detection area 100, the image grayscale value corresponding to the processed detection area 100 in the scanned image is smaller than the image grayscale value corresponding to the first material 60, and the image grayscale value corresponding to the first material 60 is greater than the image grayscale value corresponding to the second material 70.

[0145] In this embodiment, the first direction can be from left to right, from right to left, from top to bottom, or from bottom to top. This embodiment is not limited to this. The left to right direction is used as an example for description. The cathode sheet 40 is an AP roll weld material 50. The unprocessed detection area 110 can be aluminum foil. The processed detection area 100 can be a weld mark. The first material 60 can be AT11, and the second material 70 can be a film area. When viewed from the front, the AP roll weld material 50 consists of a film area, AT11 (segments ab), aluminum foil, and a weld mark (segments cd).

[0146] The film area is a compacted powdery black coating. Most of the light shining on its surface is absorbed, and a small amount of diffuse reflection is produced.

[0147] AT11 is a compacted powdered off-white coating, a carbon material that produces diffuse reflections when light hits its surface.

[0148] Aluminum foil is a highly reflective object. When light shines on its surface, it mostly produces specular reflection and almost no diffuse reflection.

[0149] The weld mark is created by ultrasonic extrusion and friction between narrow aluminum foil 80 and wide aluminum foil 90. Its surface properties are similar to those of aluminum foil, but with a concave and convex shape. This embodiment of the present application effectively distinguishes between the unprocessed inspection area 110, the processed inspection area 100, the first material 60, and the second material 70, taking into account the inherent properties of the materials.

[0150] According to some embodiments of the present application, the diffuse reflectivity of the first material 60 is optionally greater than that of the second material 70, the diffuse reflectivity of the second material 70 is greater than that of the unprocessed detection area 110, the unprocessed detection area 110 comprises aluminum foil, the processed detection area 100 is a weld mark obtained by processing the aluminum foil, and the surface of the processed detection area 100 is provided with a concave-convex structure. This allows for a black-and-white effect based on the light-reflecting properties of the materials, making it easier to distinguish.

[0151] According to some embodiments of the present application, optionally, the first material 60 includes a gray coating, the second material 70 includes a black coating, the unprocessed detection area 110 includes aluminum foil, the processed detection area 100 is obtained by processing the unprocessed detection area 110, and the surface of the processed detection area 100 is configured with a concave-convex structure. In this embodiment, because the first material 60 includes a gray coating, the second material 70 includes a black coating, the unprocessed detection area 110 includes aluminum foil, and the processed detection area 100 is obtained by processing the unprocessed detection area 110, and the surface of the processed detection area 100 is configured with a concave-convex structure, a black and white effect is presented based on the light properties of the materials, which is more conducive to differentiation.

[0152] According to some embodiments of the present application, optionally, the photographing device 10 includes a line scan camera, and the line scan camera is parallel to the direction of the unprocessed inspection area 110 .

[0153] A line scan camera is a device that converts optical signals into ordered electrical signals. It can scan line by line at a high speed and at a certain frequency, ultimately forming a complete image. This implementation uses a line scan camera with a resolution of 4K (4096*2) and a single pixel size of 7um*7um.

[0154] A linear light source 20 is also provided: To cope with the high-speed operation of the equipment, the line scan camera needs to capture images at a very fast speed. Therefore, the exposure time of each line in the corresponding image needs to be controlled very short. This requires that the brightness of the line scan light source 20 be very high to achieve the overall grayscale value of the image. To ensure the consistency of the image, a linear light source 20 with a light-emitting surface length of 70mm is selected in this embodiment;

[0155] It is also equipped with a line scan lens: it needs to be reasonably adapted to the camera's chip size, resolution, interface, field of view and working distance and adjusted to the best visual effect. In this embodiment, a 60mm focal length lens is selected.

[0156] This embodiment is based on visual inspection at specific angles using a black and white line scan camera and a linear light source 20, which expands the difference between the target object and the background and solves the problem of similarities between weld marks and aluminum foil. The use of a black and white line scan camera is more sensitive to the concave and convex features of the weld mark, the brightness differences of the film area and the tab area, and can more effectively distinguish the boundaries.

[0157] According to the field of view of the target object currently required for detection, in one case, the weld mark is 40mm away from the edge of the tab, 20mm of the film area outside the weld mark is reserved, and 20mm is reserved outside the tab, so a total field of view of 80mm is required. Using a 4K camera with a horizontal resolution of 4096, the accuracy can be achieved to 0.0195mm / pixel, which helps to reduce errors. In another case, the weld mark is 30mm away from the edge of the tab, 10mm of the film area outside the weld mark is reserved, and 10mm is reserved outside the tab, so a total field of view of 50mm is required. Using a 4K camera with a horizontal resolution of 4096, the accuracy can be achieved to 0.012mm / pixel, which greatly reduces errors.

[0158] The high-speed bandwidth of the Camlink line scan camera data cable can achieve real-time detection of the weld mark size and various spacing distances of the roll weld material, balance the relationship between detection accuracy and movement speed, and maximize the speed limit compatible with the CCD system while meeting the detection requirements to meet the production requirements of the equipment.

[0159] Since the roll welding equipment moves continuously at high speed, the area array camera cannot achieve a fast acquisition speed while maintaining the same accuracy due to the bandwidth of the data transmission line. In addition, the brightness of the light source 20 supporting the area array camera is generally low, which determines that the area array camera cannot reduce the exposure time to a very small value. Therefore, there will be a certain amount of ghosting in the captured image, which affects the algorithm's capture and detection of the weld mark boundary. The line scan camera can perform high-speed line-by-line scanning at a certain frequency according to the operating speed of the roll welding equipment, thereby improving the accuracy of the captured image.

[0160] According to some embodiments of the present application, a mounting bracket is optionally further included, wherein the camera and the light source are both mounted on the mounting bracket, the light source is configured to be mounted on the side of the cathode sheet, and the camera is configured to be positioned directly opposite the cathode sheet; the camera is configured to receive reflected light from the cathode sheet when the light source illuminates the cathode sheet, and to perform imaging based on the reflected light to obtain a scanned image of the cathode sheet. The camera and the light source are both mounted on the same mounting bracket, and when the position of the camera is adjusted, the light source can be adjusted synchronously, thereby improving detection efficiency.

[0161] Since the sizes of the cathode sheets 40 vary, if the shooting device 10 is fixed, it will not be conducive to image acquisition of cathode sheets 40 of different sizes. In this embodiment, the field of view of the line scan camera is fixed, and no changes are required after the initial adjustment. If it is necessary to be compatible with materials with different welding and printing spacings, the camera only needs to be translated in the width direction of the material. Fixing the camera and light source 20 on the same bracket can ensure that the effect of the picture does not change.

[0162] According to some embodiments of the present application, the mounting bracket is optionally movably mounted along a first direction, the first direction being different from the shooting direction of the shooting device. Since the shooting device and the light source are fixed to the same bracket, the mounting bracket is movably mounted along the first direction, and a sliding member can be provided to adjust the positions of the shooting device and the light source. Since the field of view of the line scan camera is fixed, no subsequent changes are required after initial adjustments. In order to be compatible with materials with different weld print spacings, the shooting device only needs to be translated in the material width direction via a sliding member, thereby improving shooting flexibility. Furthermore, fixing the line scan camera and the light source on the same bracket can ensure that the effect of the image does not change, thereby improving the accuracy of the captured image.

[0163] In this embodiment, the shooting device 10 and the light source 20 can be flexibly adjusted through a sliding part. For materials of different widths, there is no need for repeated disassembly and debugging. The camera is fixed on the bracket slide and can be quickly switched to different materials by sliding left and right, thereby improving compatibility. Fixing the line scan camera and the light source 20 on the same bracket can ensure that the effect of the picture does not change, thereby improving the accuracy of the captured image.

[0164] According to some embodiments of the present application, the cathode film detection system may optionally further include a rotating shaft for transporting the cathode film 40, the rotating shaft being provided with an angle acquisition device. The angle acquisition device is configured to generate a pulse signal based on the acquired angle, and to control the frequency of the photographing device 10 through the pulse signal.

[0165] In this embodiment, the angle acquisition device can be an encoder or other forms of angle acquisition devices. The angle acquisition device is installed on the rotating shaft of the material and is provided by the rolling welding equipment. During the movement of the material, the rotating shaft and the angle acquisition device are driven to rotate together. The angle acquisition device can output a pulse signal every time it rotates a certain angle, thereby driving the shooting frequency of the shooting device 10 and the material movement speed to be unified, ensuring that the image can be output stably at different speeds and corresponds one-to-one with the material.

[0166] According to some embodiments of the present application, optionally, an inspection object is provided on the rotating shaft, and the inspection object and the cathode film are both provided within the shooting field of view of the photographing device 10. The photographing device 10 is further used to generate a scanned image containing an image of the inspection object when receiving reflected light from the inspection object and the cathode film, and send the scanned image containing the image of the inspection object to the host computer; the host computer is also used to perform matching detection on the image of the inspection object in the scanned image, and output an alarm signal to issue an alarm reminder when the detection result is abnormal. The inspection process is automated through the inspection object, and the inspection is automatically completed during the normal inspection process. There is no need to worry about employees missing the inspection due to subjective reasons, and there is no need to perform regular inspection operations to increase the workload of employees.

[0167] The inspection object may be an inspection object with high imaging clarity and contrast clarity. The accuracy of the image can be determined by collecting an image of the inspection object and performing comparative analysis with the original inspection object.

[0168] In this embodiment, the inspection object can be set on the rotating shaft and set within the shooting field of view of the shooting device 10. The image detection can be achieved by shooting the inspection object. Since the rotating shaft is constantly rotating, when the shooting device 10 triggers the shooting, the inspection object can follow the rotating shaft back to the shooting field of view of the shooting device 10 without the need to re-set the inspection object. By integrating the automatic inspection function, automatic inspection can be achieved without human participation.

[0169] This embodiment automates the spot inspection process by inspecting objects, and automatically completes spot inspections during normal testing. There is no need to worry about employees missing spot inspections due to subjective reasons, nor is there a need to perform regular spot inspections to increase employee workload.

[0170] According to some embodiments of the present application, optionally, the inspection object includes a film.

[0171] Film improves the accuracy of inspection because of its excellent contrast clarity, minimal error due to external interference and high precision.

[0172] According to some embodiments of the present application, the cathode film detection system optionally further includes: an interactive device, the interactive device being communicatively connected to the host computer 300; the host computer 300 being further configured to send an alarm signal to the interactive device; and the interactive device being configured to issue an alarm reminder based on the alarm signal. By providing the interactive device and providing an abnormality reminder through the interactive device, the real-time nature of abnormality handling is improved.

[0173] In this embodiment, the interactive device may be a terminal device, which is provided with an input device and a display device, and an alarm reminder is made through the display device. The alarm reminder may be made through sound or other means, and this embodiment does not impose any restrictions on this.

[0174] According to some embodiments of the present application, the host computer 300 is optionally further configured to display edge detection results of the scanned image and issue an alarm if the edge detection result is abnormal. The interactive device is further configured to obtain parameter information input by the user and adjust the edge detection result based on the parameter information. The interactive device allows for real-time adjustment of the edge detection result, thereby improving the flexibility and visualization of data processing.

[0175] In this embodiment, the abnormal detection result may be that the weld mark does not meet the preset requirements, is too wide or too narrow, or that the number of abnormal weld mark widths reaches a preset number, and also includes other abnormal conditions, which are not limited in this embodiment.

[0176] According to some embodiments of the present application, the cathode sheet detection system optionally further includes: a deflection correction device, the deflection correction device being communicatively connected to the control device, which in turn is communicatively connected to the host computer 300; the host computer 300 is further configured to analyze the edge detection results to obtain adjustment information for the deflection correction device, and transmit the adjustment information to the deflection correction device, the deflection correction device being configured to adjust the position of the processing device based on the adjustment information to adjust the processing size of the processing device. The processing size of the processing device on the production line can be adjusted in real time by the deflection correction device of the lower computer, thereby achieving automation and refined control of the production line.

[0177] In this embodiment, the host computer 300 can directly exchange information with the correction device to improve the efficiency of data transmission.

[0178] In some embodiments, host computer 300 is further configured to transmit adjustment information to a control device. The control device is configured to generate an adjustment signal based on the adjustment information and transmit the adjustment signal to a correction device. The correction device is configured to adjust the position of the processing device based on the adjustment signal to adjust the processing size. In this embodiment, signal transmission between host computer 300 and the correction device is achieved through the control device, thereby improving the effective control of various devices on the production line.

[0179] In this embodiment, since there are too many devices interacting with the host computer, signal transmission errors are likely to occur when the host computer 300 directly interacts with the correction device. Therefore, the signal transmission between the host computer 300 and the correction device is realized through the control device, thereby improving the accuracy of signal transmission.

[0180] In some embodiments, the cathode film inspection system further includes a lens (not shown) positioned between the cathode film and a camera; the lens is configured to refract and focus light reflected from the cathode film, projecting it onto a photosensitive element of the camera to obtain a scanned image of the cathode film. Positioning the lens between the cathode film and the camera allows for more efficient projection of light reflected from the cathode film onto the photosensitive element of the camera, thereby improving image acquisition accuracy.

[0181] According to some embodiments of the present application, optionally, the cathode film also includes an unprocessed detection area and a first material, and the upper computer 30 is further used to obtain the image grayscale value of each pixel point in the scanned image; determine the grayscale difference between the adjacent pixel points based on the image grayscale value of each pixel point; fit the pixel points corresponding to the grayscale difference greater than the preset pixel threshold to obtain the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material in the scanned image, and obtain the edge detection result based on the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material in the scanned image.

[0182] In this embodiment, the preset pixel threshold may be 80 or other values, and this embodiment does not limit this. In this embodiment, the preset pixel threshold of 80 is used as an example for illustration, and the preset pixel threshold may also be flexibly adjusted according to actual needs.

[0183] In this embodiment, the pixel points corresponding to the grayscale difference greater than the preset pixel threshold are fitted to obtain the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material in the scanned image. The grayscale difference between the pixel points is used as a reference factor for judging the boundary line, thereby improving the accuracy of boundary line recognition. According to some embodiments of the present application, optionally, the host computer 30 is also used to determine the boundary line of the unprocessed detection area 110, the boundary line of the processed detection area 100, and the boundary line of the first material 60 in the scanned image based on the pixel points corresponding to the grayscale difference greater than the preset pixel threshold and the arrangement position of the unprocessed detection area 110, the processed detection area 100, and the first material 60 in the cathode sheet 40, and obtain the edge detection result based on the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material in the scanned image.

[0184] Since the arrangement positions of the unprocessed detection area 110, the processed detection area 100 and the first material 60 are fixed, the boundary lines of the unprocessed detection area 110, the boundary lines of the processed detection area 100 and the first material 60 are preliminarily determined according to the arrangement positions of the materials without the need for calculation through complex algorithms, thereby improving the efficiency of material edge recognition.

[0185] According to some embodiments of the present application, optionally, the boundary line of the first material in the scanned image includes the first boundary line of the first material; the upper computer 30 is further used to determine the auxiliary area of ​​the first material 60 based on the width of the material corresponding to the unprocessed detection area 110 and the boundary line of the unprocessed detection area 110, adjust the first boundary line of the first material 60 according to the auxiliary area of ​​the first material 60 to obtain the target first boundary line of the first material 60, and obtain the edge detection result according to the boundary line of the unprocessed detection area, the boundary line of the processed detection area and the target boundary line of the first material in the scanned image.

[0186] The first boundary line of the first material 60 refers to the initial boundary line identified based on the grayscale difference, that is, the boundary line on the left of AT11. The target first boundary line of the first material 60 is the accurate boundary line finally identified. The auxiliary area is the predicted area where the target first boundary line of the first material 60 in the scanned image appears, which is obtained by dividing the area by the width of the material corresponding to the unprocessed detection area 110 and the boundary line of the unprocessed detection area 110. Since the edge of the aluminum foil is prone to warping, misjudgment is prone to occur. Therefore, the initial boundary line is further verified with the help of the more accurate boundary line of the aluminum foil to obtain a more accurate boundary line on the left of AT11. According to some embodiments of the present application, optionally, the boundary line of the processed detection area 100 includes a first boundary line and a second boundary line of the processed detection area 100; the upper computer 30 is further used to determine the auxiliary area of ​​the processed detection area 100 based on the width of the processed detection area 100 and the first boundary line of the processed detection area 100, adjust the second boundary line of the processed detection area 100 according to the auxiliary area of ​​the processed detection area 100, and obtain the target second boundary line of the processed detection area 100, and obtain the edge detection result according to the boundary line of the unprocessed detection area, the first boundary line and the target second boundary line of the processed detection area and the target boundary line of the first material in the scanned image.

[0187] In this embodiment, as shown in the boundary line detection schematic diagram of Figure 7, the target second boundary line of the processed detection area 100 is the third boundary line 3 in Figure 7, that is, the right side of the weld mark, and the first boundary line of the processed detection area 100 is the left side of the weld mark, such as the second boundary line 2 in Figure 7. Since the right side of the weld mark is close to the aluminum foil, interference may be caused by wrinkles, warping, etc. on the right edge of the aluminum foil. In order to avoid interference, the width of the weld mark is used to reversely assist in accurately judging the boundary. Since the second boundary line 2 has been obtained, the width of the weld mark is fixed, about 5 mm. About 5 mm to the right of the second boundary line 2, the auxiliary area of ​​the weld mark is obtained. According to the auxiliary area, part of the noise can be removed, and then the auxiliary area is corrected according to the grayscale value between the right side of the weld mark and the left side of AT11 to obtain the target second boundary line of the weld mark.

[0188] In this embodiment, the auxiliary area is determined according to the parameters of the processed detection area 100 itself, and the boundary line of the processed detection area is obtained through the auxiliary area, thereby improving the accuracy of boundary line recognition.

[0189] Continuing with FIG7 , the second boundary line 2 arranged from left to right is the first boundary line of the processed detection area 100 , the third boundary line 3 arranged from left to right is the target second boundary line of the processed detection area 100 , and the auxiliary area is a reference boundary line obtained based on the width of the processed detection area 100 and the first boundary line of the processed detection area 100 , and the target second boundary line of the processed detection area 100 is obtained by fitting the reference boundary line.

[0190] In a specific implementation, the processed detection area 100 can be a weld mark. Since the weld mark is obtained by rolling welding equipment, the width of the weld mark can be obtained according to the set weld mark width before processing. Therefore, when the first boundary line of the weld mark is obtained according to the grayscale value of the image, the auxiliary area can be obtained according to the weld mark width and the first boundary line of the weld mark. The grayscale value of the pixel on the auxiliary area is compared with the preset threshold, and iterative processing is performed. Finally, the target second boundary line of the weld mark is finally identified by fitting, thereby realizing effective identification of the boundary line of the weld mark and improving the accuracy of boundary line identification.

[0191] According to some embodiments of the present application, a cathode sheet detection method is provided, the cathode sheet detection method comprising:

[0192] Driving a light source to illuminate a cathode sheet, wherein the cathode sheet includes a processed detection area, and an angle between a light beam direction of the light source and the cathode sheet is less than a preset angle;

[0193] The shooting device is controlled to obtain a scanned image containing the cathode film image, and the scanned image is transmitted to a host computer so that the host computer performs edge detection on the scanned image and identifies the edge of the processed detection area in the scanned image.

[0194] It should be noted that the execution subject of this embodiment is the PLC controller on the production line, which controls the actuators and lower computers, etc.

[0195] Since the processed inspection area is obtained by processing the unprocessed inspection area, the processed inspection area and the unprocessed inspection area are illuminated by low-angle lighting, so that the images of the processed inspection area and the unprocessed inspection area are different, thereby effectively distinguishing the image edges of the unprocessed material and the processed material, and realizing the detection of the image edges of the processed material.

[0196] According to some embodiments of the present application, optionally, the cathode sheet detection method further includes:

[0197] If the edge detection result is abnormal, the system obtains adjustment information sent by the host computer and sends this information to the correction device, which adjusts the position of the correction device based on the adjustment information to adjust the processing size of the processing device. The correction device of the lower computer adjusts the processing size of the processing device on the production line in real time, realizing automation and refined control of the production line.

[0198] According to some embodiments of the present application, referring to FIG. 8 , FIG. 8 is a flow chart of a cathode sheet detection method proposed according to some embodiments of the present application.

[0199] In this embodiment, the cathode sheet detection method includes:

[0200] Step S10: lighting the cathode sheet by a light source, wherein the cathode sheet includes a processed detection area, and an angle between the light beam direction of the light source and the cathode sheet is lower than a preset angle.

[0201] Step S20: obtaining a scanned image including a cathode film image through a photographing device.

[0202] Step S30: performing edge detection on the scanned image to identify the edge of the processed detection area in the scanned image.

[0203] The processed inspection area is illuminated by low-angle lighting, so that the image of the processed inspection area and other inspection areas are different, thereby effectively distinguishing the image edges of other inspection areas and the processed material, and realizing image edge detection of the processed material.

[0204] According to some embodiments of the present application, optionally, when the edge detection result is abnormal, the edge detection result is analyzed to obtain adjustment information of the correction device, and the adjustment information is sent to the correction device, so that the correction device adjusts its position according to the adjustment information to adjust the processing size of the processing device. The processing size of the processing device on the production line is adjusted in real time by the correction device of the lower computer, thereby realizing automation and refined control of the production line. According to some embodiments of the present application, optionally, the cathode sheet also includes an unprocessed detection area and a first material;

[0205] Step S30 also includes: obtaining the image grayscale value of each pixel point in the scanned image; determining the grayscale difference between each pixel point and the adjacent pixel point based on the image grayscale value of each pixel point; fitting the pixel points corresponding to the grayscale difference greater than the preset pixel threshold to obtain the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material in the scanned image.

[0206] In this embodiment, the preset pixel threshold may be 80 or other values, and this embodiment does not limit this. In this embodiment, the preset pixel threshold of 80 is used as an example for illustration, and the preset pixel threshold may also be flexibly adjusted according to actual needs.

[0207] In this embodiment, pixel points corresponding to grayscale differences greater than a preset pixel threshold are fitted to obtain the boundary lines of the unprocessed detection area, the boundary lines of the processed detection area, and the boundary lines of the first material in the scanned image. The grayscale difference between pixel points is used as a reference factor for judging the boundary line, thereby improving the accuracy of boundary line recognition. Step S30 also includes: determining the boundary lines of the unprocessed detection area, the boundary lines of the processed detection area, and the boundary lines of the first material in the scanned image based on the pixel points corresponding to the grayscale difference greater than the preset pixel threshold and the arrangement positions of the unprocessed detection area, the processed detection area, and the first material in the cathode sheet. Since the arrangement positions of the unprocessed detection area, the processed detection area, and the first material are fixed, the boundary lines of the unprocessed detection area, the boundary lines of the processed detection area, and the boundary lines of the first material are preliminarily determined based on the arrangement positions of the materials without having to be calculated through complex algorithms, thereby improving the efficiency of material edge recognition. Continuing with the boundary line detection schematic diagram shown in Figure 7, the second boundary line 2 arranged from left to right is the first boundary line of the processed detection area, and the third boundary line 3 arranged from left to right is the target second boundary line of the processed detection area. The auxiliary area is a reference area obtained based on the width of the processed detection area and the first boundary line of the processed detection area, and then the target second boundary line of the processed detection area is obtained by area fitting.

[0208] In a specific implementation, the processed detection area can be a weld mark. Since the weld mark is obtained by rolling welding equipment, the width of the weld mark can be obtained according to the set weld mark width before processing. Therefore, when the first boundary line of the weld mark is obtained according to the grayscale value of the image, the auxiliary area can be obtained according to the weld mark width and the first boundary line of the weld mark. The grayscale value of the pixel on the auxiliary area is compared with the preset threshold, and iterative processing is performed. Finally, the target second boundary line of the weld mark is finally identified by fitting, thereby realizing effective identification of the boundary line of the weld mark and improving the accuracy of boundary line identification.

[0209] In this embodiment, an example is provided in which the unprocessed detection area is aluminum foil, the processed detection area is a weld mark, and the first material is AT11. Since the material of the cathode sheet is already set, the positions of the aluminum foil, the weld mark, AT11, and the film area are fixed. That is, as shown in FIG7 , from left to right are the scanned images corresponding to the aluminum foil, the weld mark, AT11, and the film area. First, each boundary line is determined based on the span of the pixel grayscale value in the scanned image, such as the first boundary line 1, the second boundary line 2, and the fifth boundary line 5 in FIG7 . For example, it can be seen from FIG7 that the first boundary line 1, the second boundary line 2, and the fifth boundary line 5 are boundary lines with relatively obvious black and white boundaries. The difference between the grayscale value of the pixel to the left of the first boundary line 1 and the grayscale value of the pixel to the right of the first boundary line 1 exceeds 80, so that the boundary lines of each material can be preliminarily obtained, namely, the boundary line corresponding to the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material, thereby achieving preliminary identification of the boundary lines.

[0210] Because the arrangement positions of the unprocessed detection area, the processed detection area, and the first material are fixed, the boundary lines of the unprocessed detection area, the boundary lines of the processed detection area, and the boundary lines of the first material are preliminarily determined based on the arrangement positions of the materials, without the need for complex algorithmic calculations, thereby improving the efficiency of material edge recognition. According to some embodiments of the present application, optionally, the boundary line of the first material in the scanned image includes a first boundary line of the first material, and the cathode film detection method further includes: determining an auxiliary area of ​​the first material based on the width of the material corresponding to the unprocessed detection area and the boundary line of the unprocessed detection area; and adjusting the first boundary line of the first material based on the auxiliary area of ​​the first material to obtain a target first boundary line of the first material.

[0211] The first boundary line of the first material refers to the initial boundary line identified based on the grayscale difference, that is, the boundary line on the left of AT11. The target first boundary line of the first material is the accurate boundary line finally identified. The auxiliary area is the predicted area where the target first boundary line of the first material in the scanned image appears, which is obtained by dividing the area by the width of the material corresponding to the unprocessed detection area and the boundary line of the unprocessed detection area. Since the edge of the aluminum foil is prone to warping, it is easy to cause misjudgment. Therefore, the initial boundary line is further verified with the help of the more accurate boundary line of the aluminum foil to obtain a more accurate boundary line on the left of AT11.

[0212] Continuing with FIG7 , in the traditional lithium battery production process, aluminum foil as the cathode substrate needs to be coated and die-cut to produce tabs. In this embodiment, a new cathode substrate is used, which is not aluminum foil but AP material. In order to facilitate the use of laser to cut it into tabs for welding and to make the aluminum-plated layers on both sides of the AP connected to each other, two layers of aluminum foil, one wide and one narrow, are used to sandwich the AP material in the middle, and the aluminum foils on both sides of the AP are penetrated and welded together. The wide aluminum foil can be used for die-cutting to produce normal tabs. The weld mark is obtained by processing the aluminum foil, so the width of the aluminum foil is fixed.

[0213] Because the edge of the aluminum foil is close to AT11, it is prone to warping, which can easily lead to misjudgment. Therefore, the fourth boundary line 4, i.e., the boundary of the aluminum foil material, is obtained by combining the first boundary line 1 with the width of the aluminum foil. Since the aluminum foil material is adjacent to AT11, the fourth boundary line 4 is a relatively accurate boundary line to the left of AT11. Furthermore, since the boundary line of AT11 is initially screened out using grayscale values, the fourth boundary line 4 obtained using the width of the aluminum foil is further corrected with the boundary line of AT11 initially screened out using grayscale values ​​to obtain an accurate boundary line to the left of AT11, i.e., the target first boundary line of the first material. This embodiment determines an auxiliary region based on the parameters of the material itself and uses this auxiliary region to determine the boundary line of the first material, thereby improving the accuracy of boundary line recognition.

[0214] According to some embodiments of the present application, the boundary line of the processed inspection area includes a first boundary line and a second boundary line of the processed inspection area. Optionally, the cathode sheet inspection method further includes:

[0215] The auxiliary area of ​​the processed detection area is determined according to the width of the processed detection area and the first boundary line of the processed detection area; and the target second boundary line of the processed detection area is obtained by adjusting the auxiliary area of ​​the processed detection area and the second boundary line of the processed detection area.

[0216] In this embodiment, the target second boundary line of the processed inspection area is the third boundary line 3 in Figure 7, that is, the right side of the weld mark, and the first boundary line of the processed inspection area is the left side of the weld mark, such as the second boundary line 2 in Figure 7. Since the right side of the weld mark is close to the aluminum foil, interference may be caused by wrinkles, warping, etc. on the right edge of the aluminum foil. In order to avoid interference, the width of the weld mark is used to reversely assist in accurately judging the boundary. Since the second boundary line 2 has been obtained, the width of the weld mark is fixed, about 5 mm. About 5 mm to the right of the second boundary line 2, the auxiliary area of ​​the weld mark is obtained. According to the auxiliary area, part of the noise can be removed, and then the auxiliary area is corrected according to the grayscale value between the right side of the weld mark and the left side of AT11 to obtain the target second boundary line of the weld mark.

[0217] In this embodiment, the auxiliary area is determined according to the parameters of the processed detection area itself, and the boundary line of the processed detection area is obtained through the auxiliary area, thereby improving the accuracy of boundary line recognition.

[0218] In this embodiment, as shown in Figures 9 and 10, the main inspection contents of the roll welding process inspection camera are: the film area, AT11, aluminum foil, weld mark, and the boundaries between them. Therefore, the lighting method focuses on how to clearly show the boundary lines in black and white. By utilizing the characteristics of each object, the aluminum foil and weld mark are both brightly reflective, but their forms differ. The film area and AT11 have different grayscales, with the AT11 being off-white and the film area being off-black. By selecting the side-lighting method of linear light, the concave and convex characteristics of the weld mark are clearly highlighted under low-angle linear light. However, due to the flat surface and high reflectivity of the aluminum foil, most of the light is specularly reflected and does not enter the pupil. Under the low-angle linear light, the AT11 reflects white diffusely, while the film area reflects black diffusely, creating a clear black and white distinction between the two objects.

[0219] As shown in Figure 7, from left to right in the image are: black background (with film attached), aluminum foil, weld mark, AT11, and film area. The black and white boundaries are obvious, and the respective boundary edges can be captured to determine the distance between them, meeting the detection requirements.

[0220] As shown in the overall logic diagram of Figure 11, S301: encoder trigger: controlled by the roll welding equipment, when the system detects that the object is ready during operation, it sends a pulse signal to control the camera to take a photo; S302: image acquisition: the image sensor collects the picture information P after receiving the trigger signal; S303: core calculation: through the core calculation module, S304: solve the positions of aluminum foil, welding mark, AT11, film area, etc. according to the collected picture information P; S305: calculate the spacing of the intersection; S306: alarm threshold: the calculated acceptable size range, such as 0~1mm. When the actual offset reaches this threshold, it means that the material has a dimensional quality problem and the position needs to be corrected in time and an alarm is issued; S307: alarm signal output: when the difference value exceeds the acceptable range, the result needs to be output, which can be various forms of alarm signals to remind the operator to check and maintain.

[0221] The specific steps of the core calculation are:

[0222] After the image acquisition is completed, the image shown in Figure 7 can be obtained. The main detection contents include the left and right boundaries of the weld mark and the left and right boundaries of AT11;

[0223] First, use mean filtering to remove minor interference in the image. Then use threshold segmentation to distinguish black and white grayscale. Then, fit several boundaries that meet the requirements and have the most obvious grayscale changes from left to right:

[0224] The first boundary line 1, from black to white, is the edge of the aluminum foil. The width of the aluminum foil is fixed and can help to locate and confirm the left side of the fourth AT11. It is an auxiliary line.

[0225] The second boundary line 2 is the edge line from black to white: on the left side of the weld mark, this edge has a clear black and white boundary, almost no interference, and no mistakes;

[0226] The third boundary line 3, from white to black, is on the right side of the weld mark. This edge is close to the aluminum foil and may be interfered with by wrinkles or warping on the right edge of the aluminum foil. The weld mark reference width of about 5mm can be used to reversely determine the boundary. If the width of multiple weld marks is abnormal, an alarm signal will be output. The fourth boundary line 4, from black to white, is on the left side of AT11. Since the aluminum foil edge is prone to warping, it is easy to misjudge. Therefore, the first boundary line 1 is used as an auxiliary to confirm and check.

[0227] The fifth boundary line 5 is the edge line from white to black: on the right side of AT11, this edge has a clear black and white boundary, with almost no interference and no room for error.

[0228] According to some embodiments of the present application, optionally, the cathode sheet detection method further includes:

[0229] A boundary distance between a target second boundary line of the processed detection area and a target second boundary line of the first material is obtained; and a first alarm signal is output when the boundary distance exceeds a distance threshold.

[0230] In this embodiment, the spacing threshold may be 1 mm, or other parameters, which are not limited in this embodiment. 1 mm is used as an example for illustration. When the left and right boundaries of the weld mark and the left and right boundaries of AT11 are obtained, the margin between the right boundary of the weld mark and the left boundary of AT11 is obtained, as shown in segment bc in FIG6 . Material detection is performed based on the margin. For example, when the margin between the right boundary of the weld mark and the left boundary of AT11 is 1.5 mm, the spacing threshold of 1 mm is exceeded, and an alarm signal is output. The alarm signal may be a voice reminder, a light reminder, or a text reminder, or other forms of reminders, which are not limited in this embodiment.

[0231] It is understandable that, in order to facilitate the distinction between various abnormal situations, different alarm methods may be used for each abnormal situation, so that different abnormal situations can be clearly distinguished.

[0232] In the technical solution of the embodiment of the present application, material detection is performed through boundary spacing. When the spacing threshold is exceeded, the result is output, which can be various forms of alarm signals to remind the operator to perform inspection and maintenance, thereby realizing effective reminder of abnormalities.

[0233] According to some embodiments of the present application, optionally, the cathode sheet detection method further includes:

[0234] The width of the processed detection area is determined according to the first boundary line of the processed detection area and the target second boundary line of the processed detection area; when the width of the processed detection area is inconsistent with the standard processing width, a second alarm signal is output.

[0235] In this embodiment, the width of the weld mark is obtained based on the left and right boundaries of the weld mark, and the width of the weld mark is compared with the weld mark reference width to achieve material detection. The standard processing width is the weld mark reference width. Taking the weld mark reference width of 5 mm as an example, when the weld mark width obtained by detecting the left and right boundaries of the weld mark is 6 mm, it is inconsistent with the weld mark reference width, and a second alarm signal is output.

[0236] In a specific implementation, the difference between the width of the processed inspection area and the standard processing width can also be set. When the difference is within a preset range, it is determined that the width of the processed inspection area is consistent with the standard processing width. When the difference exceeds the preset range, it is determined that the width of the processed inspection area is inconsistent with the standard processing width. The preset range can be 0 to 1 mm, or other parameters, and this embodiment does not limit this.

[0237] In the technical solution of the embodiment of the present application, when the width of the processed detection area is abnormal, the result is output, which can be an alarm signal in various forms to remind the operator to perform inspection and maintenance, thereby realizing effective reminder of the abnormality.

[0238] According to some embodiments of the present application, optionally, the cathode sheet detection method further includes:

[0239] The number of abnormal images of the cathode sheet whose width of the processed detection area is inconsistent with the standard processing width is counted; when the number of abnormal images exceeds a quantity threshold, a third alarm signal is output.

[0240] The quantity threshold may be 3 sheets or other parameters, which are not limited in this embodiment. 3 sheets are used as an example for illustration. If the width of the weld mark in the scanned image is abnormally greater than 3 sheets, the weld mark is determined to be abnormal and an alarm signal is output. The alarm signal may take various forms, which are not limited in this embodiment.

[0241] In a specific implementation, the third alarm signal can be used in a form different from other alarm modes to alarm, thereby accurately locating abnormal conditions, facilitating on-site inspection and maintenance, and improving maintenance efficiency.

[0242] In this embodiment, when the width of the processed detection area exceeds a preset number and is abnormal, the result is output, which can be various forms of alarm signals to remind the operator to perform inspection and maintenance, thereby realizing effective reminder of abnormalities.

[0243] According to some embodiments of the present application, optionally, the boundary line of the first material in the scanned image includes the second boundary line of the first material, and the cathode film detection method further includes: determining the width of the first material based on the target first boundary line of the first material and the second boundary line of the first material; and outputting a fourth alarm signal when the width of the first material is inconsistent with the standard material width.

[0244] In this embodiment, the target first boundary line of the first material is the left boundary line of the first material, which is obtained through multiple iterative fitting. The second boundary line of the first material is obtained according to the grayscale difference of the image, that is, the right boundary line of the first material.

[0245] In a specific implementation, the grayscale value is first compared with the grayscale threshold to obtain the right boundary of the first material, that is, the right side of the AT11 image. Then, the left side of the AT11 image is obtained with the assistance of the width of the aluminum foil, thereby obtaining the left and right boundary lines of the AT11 image. The width of the AT11 is obtained based on the left and right boundary lines of the AT11 image. Since the width of the AT11 material is set, the actual detected width of the AT11 is compared with the set width of the AT11, thereby realizing the detection of the width of the AT11.

[0246] In a specific implementation, the standard material width is the set width of AT11. The width of AT11 actually detected is compared with the set width of AT11. When the width of AT11 actually detected is consistent with the set width of AT11, it indicates that the scanned image is normal. When the width of AT11 actually detected is inconsistent with the set width of AT11, it indicates that the scanned image is abnormal. In this case, an alarm signal is output and an alarm prompt is issued to remind the operator to perform inspection and maintenance.

[0247] In a specific implementation, the fourth alarm signal may be used in a form different from other alarm modes to provide an alarm, thereby accurately locating abnormal conditions, facilitating on-site inspection and maintenance, and improving maintenance efficiency.

[0248] In the technical solution of the embodiment of the present application, when the width of the first material is abnormal, the result is output, which can be various forms of alarm signals to remind the operator to perform inspection and maintenance, thereby realizing effective reminder of the abnormality.

[0249] According to some embodiments of the present application, optionally, the cathode sheet detection method further includes:

[0250] The scanned image is divided into regions to obtain images of each region; the images of each region are screened according to the characteristics of the film; when there is a region with film characteristics, the width of the film image in the region with film characteristics is compared with the standard film width; when the difference between the width of the film image and the standard film width exceeds a width threshold, a fifth alarm signal is output.

[0251] In this embodiment, the standard film width is the width of the actual film, and the width threshold can be 1mm or other parameters. This embodiment does not impose any restrictions on this. The width threshold is taken as 1mm for explanation. As shown in the film size diagram in Figure 12, L1 represents the width of the film, and L2 represents the distance between the film and the reference position. For example, if the width of the film image is 3mm and the standard film width is 5mm, the difference between the width of the film image and the standard film width is 2mm, which exceeds the width threshold of 1mm, indicating that the scanned image is abnormal. In this case, an alarm signal is output to issue an alarm prompt to remind the operator to perform inspection and maintenance. The fifth alarm signal can be used in a form different from other alarm methods to alarm, thereby accurately locating the abnormal situation, facilitating on-site inspection and maintenance, and improving maintenance efficiency.

[0252] It should be noted that, as shown in the schematic diagram of the imaging effect of the roll welding process in FIG7 , the scanned image includes an image of the inspection object. Film can be used as the inspection object. Film has excellent contrast clarity, minimal error due to external interference, extremely high precision, and is freely customizable. It is equivalent to the negative of a photograph. To improve monitoring accuracy, the film must be firmly and stably fixed within the field of view of the image sensor for automatic inspection. Specifically, the cathode film material is transported by rollers. The conveyor belt on the rollers only occupies a portion of the rollers, and the film is attached to the remaining portion. The film is directly opposite the camera device at the position of the roller's rotating shaft. When the camera device takes a picture, the scanned image includes both the cathode film image and the film image. An angle acquisition device is provided on the rotating shaft. A pulse signal is generated based on the acquired angle. This pulse signal controls the camera's photography frequency. Specifically, when the rotating shaft rotates one circle, the camera device is simultaneously controlled to start taking pictures. This synchronizes the material's delivery to the photography position with the start of the photography by the camera device, and the film also returns to the original photography position along the rotating shaft, achieving automatic inspection.

[0253] In a specific implementation, as shown in the inspection process diagram of FIG13 , S401: After acquiring the image information, preprocessing S402 is first performed: including multiple methods such as mean filtering, Gaussian filtering, and median filtering, the purpose of which is to make the image purer and the transition smoother, and to prevent noise from interfering with the image. In addition, through algorithm processing: fine burrs on the surface of the object in the image are removed. Then S403: threshold processing is performed: based on the processed image, all areas with grayscale values ​​within a certain range are screened out, and then S404: connected domain segmentation is performed: all areas that meet the conditions are separated into independent areas; S405: these areas in the image are screened according to the characteristics of the film, S406: whether there is a connected domain that meets the characteristics of the film; if there is a matching area, it means that the location of the film has been found in the image, and then S407: whether the width of the film is consistent with the actual object is detected. If the difference exceeds the threshold or the film is not screened out, it means that there is a problem with the measurement, and S408: an alarm signal is output.

[0254] In the present embodiment, when the film image is abnormal, the result is output, which may be various forms of alarm signals, to remind the operator to perform inspection and maintenance, thereby realizing effective reminder of the abnormality.

[0255] According to some embodiments of the present application, optionally, the cathode film detection method further includes: outputting a sixth alarm signal when there is no region with film characteristics.

[0256] It is understandable that when there is no area with film characteristics, it means that there is a problem with the measurement. In this case, an alarm signal is output and an alarm prompt is issued to remind the operator to perform inspection and maintenance. Among them, the sixth alarm signal can be used in a form different from other alarm methods to alarm, so as to accurately locate the abnormal situation, facilitate on-site inspection and maintenance, and improve maintenance efficiency.

[0257] In the present embodiment, when no film is detected, the result is output, which may be an alarm signal in various forms, to remind the operator to perform inspection and maintenance, thereby realizing effective reminder of abnormalities.

Claims

1. A cathode film detection system, wherein: The cathode film detection system comprises: a shooting device, a light source and a host computer; The light source is used to illuminate the cathode sheet, wherein the cathode sheet includes a processed detection area, an unprocessed detection area, a first material and a second material, wherein the diffuse reflectivity of the first material is greater than the diffuse reflectivity of the second material, the diffuse reflectivity of the processed detection area is greater than the diffuse reflectivity of the unprocessed detection area, and the angle between the beam direction of the light source and the cathode sheet is lower than a preset angle; The photographing device is used to receive diffuse light from the processed inspection area, the first material and the second material, and to perform imaging according to the diffuse light to obtain a scanned image of the cathode film; The host computer is used to perform edge detection on the scanned image and identify the edge of the processed detection area in the scanned image.

2. The cathode film detection system according to claim 1, wherein: The angle between the light beam direction of the light source and the cathode plate is 15° to 35°.

3. The cathode film detection system according to claim 2, wherein: The angle between the light beam direction of the light source and the cathode plate is 20° to 30°.

4. The cathode film detection system according to claim 3, wherein: The angle between the light beam direction of the light source and the cathode plate is 25°.

5. The cathode film detection system according to claim 1, wherein: The cathode sheet is an AP roll welding material, the first material includes a gray coating, the second material includes a black coating, the unprocessed detection area includes an aluminum foil, and the processed detection area includes a weld mark.

6. The cathode film detection system according to claim 1, wherein: It also includes a mounting bracket, the camera and the light source are both mounted on the mounting bracket, the light source is used to be mounted on the side of the cathode sheet, and the camera is used to be mounted directly opposite to the cathode sheet; The photographing device is used to receive the reflected light of the cathode film when the light source illuminates the cathode film, and to perform imaging based on the reflected light to obtain a scanned image of the cathode film.

7. The cathode film detection system according to claim 6, wherein: The mounting bracket is movably mounted along a first direction, and the first direction is different from the shooting direction of the shooting device.

8. The cathode film detection system according to claim 7, wherein: The unprocessed detection area includes aluminum foil, the processed detection area includes aluminum foil printed with welding marks, the first material includes a material coated with a gray coating, and the second material includes a material coated with a black coating.

9. The cathode film detection system according to claim 1, wherein: The cathode sheet detection system also includes: a conveying device, a processing device and a control device; The conveying device is used to transport the target material; The processing device is arranged on a transport path of the target material transported by the conveying device; The processing device is used to process the target material to obtain a processed cathode sheet when receiving a processing instruction sent by the control device.

10. The cathode film detection system according to claim 9, wherein: The processing device includes a roll welding device; The roll welding device is used to roll weld the target material to obtain a roll-welded cathode sheet when receiving a roll welding instruction sent by the control device.

11. The cathode film detection system according to claim 9, wherein: The cathode film detection system further includes: an encoding device, the encoding device being electrically connected to the photographing device; The encoding device is arranged on the rotating shaft of the transmission device and rotates along with the rotating shaft; The encoding device is used to output a pulse signal according to the rotation angle, and send the pulse signal to the shooting device, driving the shooting device to take a picture of the cathode film at a shooting frequency corresponding to the pulse signal, so that the shooting device obtains a scanned image of the cathode film.

12. The cathode film detection system according to claim 11, wherein: The rotating shaft is provided with a spot inspection object, and the spot inspection object and the cathode sheet are both arranged within the shooting field of view of the shooting device; The light source is used to illuminate the inspection object; The photographing device is further used to generate a scanned image containing the image of the object to be inspected upon receiving the reflected light from the object to be inspected and the cathode film, and send the scanned image containing the image of the object to be inspected to the host computer; The host computer is also used to perform matching detection on the inspection object image in the scanned image, and output an alarm signal for alarm reminder when the detection result is abnormal.

13. The cathode film detection system according to claim 12, wherein: The cathode sheet detection system further includes: an interaction device, the interaction device being communicatively connected to the host computer; The host computer is further used to send the alarm signal to the interactive device; The interactive device is used to issue an alarm reminder according to the alarm signal.

14. The cathode film detection system according to claim 13, wherein: The host computer is also used to display the edge detection result of the scanned image, and to issue an alarm if the edge detection result is an abnormal detection result; The interaction device is further used to obtain parameter information input by a user and adjust the edge detection result according to the parameter information.

15. The cathode film detection system according to claim 9, wherein: The cathode sheet detection system further includes: a deviation correction device, the deviation correction device is communicatively connected to the control device, and the control device is communicatively connected to the host computer; The host computer is further used to analyze the edge detection result to obtain adjustment information of the deviation correction device, and send the adjustment information to the deviation correction device; The deviation correction device is used to perform position adjustment according to the adjustment information to adjust the processing size of the processing device.

16. The cathode film detection system according to claim 15, wherein: The host computer is further used to send the adjustment information to the control device; The control device is used to generate an adjustment signal according to the adjustment information, and send the adjustment signal to the deviation correction device; The deviation correction device is used to perform position adjustment according to the adjustment signal to adjust the processing size of the processing device.

17. The cathode film detection system according to any one of claims 1 to 16, wherein: The cathode film detection system further includes: a lens, the lens being located between the cathode film and the shooting device; The lens is used to refract and focus the light reflected from the cathode film and then project it onto the photosensitive device of the shooting device to obtain a scanned image of the cathode film.

18. The cathode film detection system according to any one of claims 1 to 17, wherein: The cathode film detection system includes: a target object, a line scan camera, an industrial computer, and the industrial computer includes a core computing model, a central control display, a roll welding device, a deviation corrector, and an encoder; The target object is the cathode material produced by the roll welding machine. The roll welding camera uses a linear light source parallel to the welding direction. The light source direction and the material after roll welding are illuminated at a low angle of 25°, which can make the concave and convex welding marks and the height difference of the aluminum foil edge produce obvious contours. The line scan camera scans line by line at a certain frequency and high speed to form an image. The central control display organizes and summarizes the equipment processing results, arranges and displays them after graphical operations, and interacts with user operations on the front-end interface. The roll welding equipment performs roll welding on the solder to obtain a welding mark. The roll welding equipment is provided with an adjustment structure, which is used to adjust the roll welding position and roll welding size of the roll welding device according to the adjustment instructions of the host computer. The corrector is the left and right adjustment mechanism of the roll welding equipment. According to the processing results fed back by the CCD system, the current position of the roll welding equipment is calculated in real time, and the left and right adjustments are made in time. The encoder is installed on the rotating shaft of the material operation, and outputs a pulse signal every time it rotates a certain angle to drive the line scan camera to take pictures.

19. The cathode film detection system according to claim 15, wherein: The cathode sheet also includes an unprocessed detection area and a first material; The host computer is also used to obtain the image grayscale value of each pixel in the scanned image, determine the grayscale difference between adjacent pixels according to the image grayscale value of each pixel, fit the pixel points corresponding to the grayscale difference greater than a preset pixel threshold to obtain the boundary line of the unprocessed detection area, the boundary line of the processed detection area and the boundary line of the first material in the scanned image, and obtain the edge detection result according to the boundary line of the unprocessed detection area, the boundary line of the processed detection area and the boundary line of the first material in the scanned image.

20. The cathode film detection system according to claim 19, wherein: The host computer is also used to determine the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material in the scanned image based on the pixel points corresponding to the grayscale difference greater than the preset pixel threshold and the arrangement positions of the unprocessed detection area, the processed detection area, and the first material in the cathode sheet, and obtain the edge detection result based on the boundary line of the unprocessed detection area, the boundary line of the processed detection area, and the boundary line of the first material in the scanned image.

21. The cathode film detection system according to claim 19, wherein: The boundary line of the first material in the scanned image includes a first boundary line of the first material; The host computer is also used to determine the auxiliary area of ​​the first material according to the width of the material corresponding to the unprocessed detection area and the boundary line of the unprocessed detection area, adjust the first boundary line of the first material according to the auxiliary area of ​​the first material to obtain the target boundary line of the first material, and obtain the edge detection result according to the boundary line of the unprocessed detection area, the boundary line of the processed detection area and the target boundary line of the first material in the scanned image.

22. The cathode film detection system according to claim 21, wherein: The boundary line of the processed detection area includes a first boundary line and a second boundary line of the processed detection area; The host computer is also used to determine the auxiliary area of ​​the processed detection area according to the width of the processed detection area and the first boundary line of the processed detection area, adjust the second boundary line of the processed detection area according to the auxiliary area of ​​the processed detection area to obtain the target second boundary line of the processed detection area, and obtain the edge detection result according to the boundary line of the unprocessed detection area in the scanned image, the first boundary line and the target second boundary line of the processed detection area, and the target boundary line of the first material.

23. A cathode sheet detection method, wherein: The cathode sheet detection method comprises: Driving a light source to illuminate a cathode sheet, wherein the cathode sheet includes a processed detection area, and an angle between a light beam direction of the light source and the cathode sheet is lower than a preset angle; The shooting device is controlled to obtain a scanned image including the cathode film image, and the scanned image is transmitted to a host computer, so that the host computer performs edge detection on the scanned image and identifies the edge of the processed detection area in the scanned image.

24. The cathode film detection method according to claim 23, wherein: The cathode sheet detection method further comprises: When the edge detection result is abnormal, obtaining adjustment information sent by the host computer; The adjustment information is sent to a deviation-correcting device, so that the deviation-correcting device performs position adjustment according to the adjustment information, so as to adjust the processing size of the processing device.

25. A cathode film detection method, wherein: The cathode sheet detection method comprises: The cathode sheet is illuminated by a light source, wherein the cathode sheet includes a processed detection area, an unprocessed detection area, a first material, and a second material, wherein the diffuse reflectivity of the first material is greater than the diffuse reflectivity of the second material, the diffuse reflectivity of the processed detection area is greater than the diffuse reflectivity of the unprocessed detection area, and the angle between the light beam direction of the light source and the cathode sheet is lower than a preset angle, wherein the angle between the light beam direction of the light source and the cathode sheet is 15° to 35°; the diffuse light of the processed detection area, the first material, and the second material is received by a shooting device, and imaging is performed according to the diffuse light to obtain a scanned image of the cathode sheet; Perform edge detection on the scanned image to identify the edge of the processed detection area in the scanned image.

26. The cathode film detection method according to claim 25, wherein: The cathode sheet detection method comprises: When the edge detection result is abnormal, analysis is performed based on the edge detection result to obtain adjustment information of the correction device, and the adjustment information is sent to the correction device so that the correction device adjusts its position based on the adjustment information to adjust the processing size of the processing device.

27. The cathode film detection method according to claim 25, wherein: The cathode sheet also includes an unprocessed detection area and a first material; The performing edge detection on the scanned image to identify the edge of the processed detection area in the scanned image also includes: Obtaining the image grayscale value of each pixel in the scanned image; Determine the grayscale difference between each pixel and an adjacent pixel according to the image grayscale value of each pixel; The pixel points corresponding to the grayscale difference greater than the preset pixel threshold are fitted to obtain the boundary line of the unprocessed detection area, the boundary line of the processed detection area and the boundary line of the first material in the scanned image.

28. The cathode film detection method according to claim 27, wherein: The cathode sheet detection method further comprises: The boundary line of the unprocessed detection area, the boundary line of the processed detection area and the boundary line of the first material in the scanned image are determined according to the pixel points corresponding to the grayscale difference greater than the preset pixel threshold and the arrangement positions of the unprocessed detection area, the processed detection area and the first material in the cathode sheet.

29. The cathode film detection method according to claim 27, wherein: The boundary line of the first material in the scanned image includes a first boundary line of the first material, and the cathode film detection method further includes: Determining the auxiliary area of ​​the first material according to the width of the material corresponding to the unprocessed detection area and the boundary line of the unprocessed detection area; The first boundary line of the first material is adjusted according to the auxiliary area of ​​the first material to obtain a target first boundary line of the first material.

30. The cathode film detection method according to claim 29, wherein: The boundary line of the processed detection area includes a first boundary line and a second boundary line of the processed detection area, and the cathode sheet detection method further includes: Determine the auxiliary area of ​​the processed detection area according to the width of the processed detection area and the first boundary line of the processed detection area; The second boundary line of the processed inspection area is adjusted according to the auxiliary area of ​​the processed inspection area to obtain a target second boundary line of the processed inspection area.

31. The cathode film detection method according to claim 30, wherein: The cathode sheet detection method further comprises: Acquire a boundary distance between a target second boundary line of the processed detection area and a target first boundary line of the first material; When the boundary distance exceeds the distance threshold, a first alarm signal is output.

32. The cathode film detection method according to claim 30, wherein: The cathode sheet detection method further comprises: Determining a width of the processed inspection area according to a first boundary line of the processed inspection area and a target second boundary line of the processed inspection area; When the width of the processed detection area is inconsistent with the standard processing width, a second alarm signal is output.

33. The cathode film detection method according to claim 32, wherein: The cathode sheet detection method further comprises: Counting the number of abnormal images in which the width of the processed detection area is inconsistent with the standard processing width; When the number of abnormal pictures exceeds the quantity threshold, a third alarm signal is output.

34. The cathode film detection method according to claim 29, wherein: The boundary line of the first material in the scanned image includes a second boundary line of the first material, and the cathode film detection method further includes: determining a width of the first material according to a target first boundary line of the first material and a second boundary line of the first material; When the width of the first material is inconsistent with the standard material width, a fourth alarm signal is output.

35. The cathode film detection method according to any one of claims 25 to 34, wherein: The cathode sheet detection method further comprises: Dividing the scanned image into regions to obtain images of each region; Screening the images of each region according to the characteristics of the film; In the case where there is a region with film features, comparing the width of the film image in the region with film features with a standard film width; When the difference between the width of the film image and the standard film width exceeds a width threshold, a fifth alarm signal is output.

36. The cathode film detection method according to claim 35, wherein: The cathode sheet detection method further comprises: When there is no region having film characteristics, a sixth alarm signal is output.

37. The cathode film detection method according to claim 25, wherein: The cathode sheet detection method further comprises: Controlled by the seam welding equipment, when the system detects that the object is ready during operation, it sends a pulse signal to control the camera to take pictures; Image information collected by the image sensor after receiving the trigger signal; The core calculation module solves the positions of aluminum foil, welding mark, AT11 and film area according to the collected image information; Calculate the spacing of the junctions; After the calculated acceptable size range, when the actual offset reaches the threshold, the position is corrected in time and an alarm is issued; When the difference value exceeds the acceptable range, the result is output to remind the operator to perform inspection and maintenance.

38. The cathode film detection method according to claim 25, wherein: The cathode sheet detection method further comprises: After the image acquisition is completed, the left and right boundaries of the weld mark and the left and right boundaries of AT11 are detected, and several boundaries that meet the requirements and have the most obvious grayscale changes are fitted from left to right: Determine the edge of the aluminum foil according to the first boundary line from black to white, and use the width of the aluminum foil to assist in locating and confirming the left side of the fourth AT11; Determine the left side of the weld mark according to the second boundary line from black to white; The right side of the weld mark is determined according to the third boundary line from white to black, and the boundary is determined by reverse calculation according to the reference width of the weld mark. If the width of the weld mark is abnormal for multiple consecutive sheets, an alarm signal is output; Determine the left side of AT11 according to the fourth boundary line from black to white, and use the first boundary line 1 side as an aid to confirm and check; The right side of AT11 is determined by the fifth boundary line from white to black.

39. The cathode film detection method according to claim 25, wherein: The cathode sheet detection method further comprises: After acquiring the image information, mean filtering, Gaussian filtering and median filtering are performed; Through algorithm processing, tiny burrs on the surface of objects in the image are removed; According to the processed images, all areas with grayscale values ​​within a certain range are screened out, and all areas that meet the conditions are separated into independent areas; According to the characteristics of the film, the area in the image is screened to determine whether there is a connected domain that meets the characteristics of the film; If there is a matching area, check whether the width of the film is the same as the actual object; If the difference exceeds the threshold or the film is not screened, an alarm signal is output.

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