Misalignment detection method, misalignment detection device, transportation device, and storage medium

Abstract

The present application provides a method for detecting misalignment of a negative electrode composite tape 1, the negative electrode composite tape 1 including a negative electrode plate 11 including a positioning hole 13, and a separator 12 attached to the surface of the negative electrode plate 11, and the misalignment detection method includes a step S1000 of acquiring an image 4 of a portion of the negative electrode composite tape 1 including the positioning hole 13, and a step S2000 of calculating a misalignment feature amount based on the image 4, where the misalignment feature amount includes any one or any combination of a misalignment amount D1 in the width direction, a misalignment amount D2 in the tape transport direction, and a misalignment angle D3.

Description

[Technical Field]

[0001] The present application relates to the field of battery technology, in particular to a method for detecting displacement of a negative electrode composite tape; Misalignment detection Devices, transport devices, and storage media. [Background technology]

[0002] The fabrication of battery cores is an important step in the battery production process. During the fabrication process, the negative electrode plate, separator, and positive electrode tape must be aligned with each other. Plate alignment is an important indicator for evaluating the quality of battery cores. Poor plate alignment significantly reduces the yield rate of batteries and increases battery production costs. In some cases, the alignment of the negative electrode plate and positive electrode tape is ensured primarily by manually inspecting the misalignment of the plates. This significantly increases labor costs, and manual inspection often fails to detect minor misalignments, failing to meet high-precision requirements. Summary of the Invention [Problem to be solved by the invention]

[0003] The present application aims to solve at least one of the technical problems in the prior art. Therefore, one object of the present application is to provide a deviation detection method for solving the problem of low manual detection accuracy. [Means for solving the problem]

[0004] An embodiment of a first aspect of the present application provides a method for detecting misalignment of a negative electrode composite tape, the negative electrode composite tape including a negative electrode plate including a positioning hole and a separator attached to the surface of the negative electrode plate, and the method for detecting misalignment includes step S1000 of acquiring an image of a portion of the negative electrode composite tape including the positioning hole, and step S2000 of calculating, based on the image, a misalignment feature amount that indicates a misalignment distance and / or angle of the negative electrode composite tape in a specific direction.

[0005] This misalignment detection method can still effectively detect the positioning holes after the separator is combined with the negative electrode plate, improving the accuracy and precision of misalignment detection. Furthermore, by calculating the misalignment feature amount based on the image, it also has the advantage of high detection efficiency, allowing the distance and / or angle of misalignment in any direction of the negative electrode composite tape to be detected simultaneously, improving detection speed, reducing the incidence of accidents, and reducing detection costs.

[0006] In some embodiments, the misalignment feature includes any one or any combination of a widthwise misalignment, a tape feed direction misalignment, and a misalignment angle. Using one or more of the three misalignment feature values, the widthwise misalignment, the tape feed direction misalignment, and the misalignment angle, the misalignment status of the negative electrode composite tape can be quickly determined and the misalignment can be easily corrected. In some embodiments, the misalignment feature value includes a widthwise misalignment, and step S2000 includes a step S2100 of calculating the widthwise misalignment. Step S2100 includes a step S2110 of locating an edge of the negative electrode plate coating region parallel to the tape feed direction based on the image, a step S2120 of calculating a center point and a widthwise midline parallel to the width direction of the image, a step S2130 of calculating an intersection point between the widthwise midline of the image and an edge of the negative electrode plate coating region parallel to the tape feed direction, and a step S2140 of calculating the distance between the center point and the intersection point as the widthwise misalignment.

[0007] By adopting this detection method, the amount of widthwise deviation of the negative electrode composite tape can be detected quickly and efficiently, and it has the characteristics of high detection efficiency, high accuracy, and high precision, which can improve the response speed of the control system and reduce the accident occurrence rate.

[0008] In some embodiments, step S2110 includes step S2111 of extracting the negative plate coating area using a thresholding algorithm based on the grayscale difference between the negative plate coating area and other areas of the negative composite tape, step S2112 of fitting a circumscribing rectangle of the extracted negative plate coating area, and step S2113 of determining an edge of the negative plate coating area that is parallel to the tape transport direction based on the circumscribing rectangle.

[0009] By adopting this detection method, the edge of the negative electrode plate coating area that is parallel to the tape feed direction can be quickly positioned, making it easier to calculate the amount of widthwise deviation, improving detection efficiency, and shortening detection time.

[0010] In some embodiments, step S2113 includes step S2113a of setting the outer edge of the circumscribing rectangle parallel to the tape transport direction as the initial positioning edge, step S2113b of shifting the edge detection ROI box to the initial positioning edge, step S2113c of acquiring edge points using an edge detection algorithm, and step S2113d of fitting the acquired edge points as a straight line and determining the straight line as the edge of the negative electrode plate coating area parallel to the tape transport direction.

[0011] By adopting the above detection method, negative The edge of the electrode plate coating area parallel to the tape feed direction can be extracted accurately and quickly, resulting in fast edge detection and high fitting accuracy.

[0012] In some embodiments, step S2113b includes step S2113b1 of calculating a center point coordinate of the initially positioned edge, and step S2113b2 of shifting the edge-detection ROI box to the initially positioned edge based on the center point coordinate.

[0013] When the above detection method is adopted, Edge detectionThe ROI box can be quickly positioned at the initial positioning edge, shortening the time required for edge detection, reducing control risks, and further improving detection efficiency and accuracy.

[0014] In some embodiments, the deviation feature includes a deviation in the tape transport direction, and step S2000 includes step S2200 of calculating the deviation in the tape transport direction, which includes step S2210 of positioning a side edge of the positioning hole parallel to the width direction based on the image, step S2220 of calculating a center point of the image and a tape transport direction midline parallel to the tape transport direction, step S2230 of calculating an intersection between the tape transport direction midline of the image and a side edge of the positioning hole parallel to the width direction, and step S2240 of calculating the distance between the center point and the intersection as the deviation in the tape transport direction.

[0015] By adopting the above detection method, it is possible to simultaneously detect the amount of misalignment of the negative electrode composite tape in the width direction and the tape feed direction in a single image, which has the characteristics of high detection efficiency, high accuracy, and high precision, thereby improving the detection speed and reducing the accident occurrence rate.

[0016] In some embodiments, step S2210 includes step S2211 of detecting the area of ​​the positioning hole based on the grayscale difference between the positioning hole and the negative electrode plate coating area, and step S2212 of obtaining the side edges of the positioning hole parallel to the width direction using an edge detection algorithm.

[0017] By adopting the above detection method, the side edges of the positioning holes parallel to the width direction can be quickly positioned, making it easier to calculate the amount of deviation in the tape feed direction, improving detection efficiency, and shortening detection time.

[0018] In some embodiments, step S2212 includes step S2212a of shifting an edge detection ROI box to the area of ​​the positioning hole, step S2212b of using an edge detection algorithm to obtain edge points of the side edges of the positioning hole that are parallel to the width direction, and step S2212c of fitting the obtained edge points as a straight line and determining the straight line as the side edge of the positioning hole that is parallel to the width direction.

[0019] By employing the above detection method, the side edges of the positioning holes parallel to the width direction can be accurately extracted from the image, and edge detection is fast and fitting accuracy is high.

[0020] In some embodiments, step S2212a includes step S2212a1 of calculating the center point coordinate of the detected positioning hole region, and step S2212a2 of shifting the edge detection ROI box to the positioning hole region based on the center point coordinate.

[0021] By adopting the above detection method, the ROI box can be quickly positioned in the positioning hole, which shortens the time required for edge detection and further improves the detection efficiency and accuracy.

[0022] In some embodiments, the negative electrode plate includes a first positioning hole and a second positioning hole, the first positioning hole and the second positioning hole being spaced apart along the width direction and having a first side edge and a second side edge parallel to the width direction, respectively, the first side edge and the second side edge being collinear, wherein step S1000 includes acquiring a first image of a portion of the negative electrode composite tape including the first positioning hole and a second image of a portion of the negative electrode composite tape including the second positioning hole, wherein the misalignment feature amount includes a misalignment angle, and step S2000 includes acquiring a second image of the portion of the negative electrode composite tape including the second positioning hole. Step S2300 includes step S2310 of positioning a first side edge of the first positioning hole based on the first image and positioning a second side edge of the second positioning hole based on the second image, step S2320 of fitting the first side edge and the second side edge to obtain a connecting line between the first side edge and the second side edge, and step S2330 of calculating, as a deviation angle, an angle between the connecting line and a reference line, where the reference line is a contour line that is parallel to the first image or the second image and parallel to the tape feed direction.

[0023] The above detection method allows for quick, efficient, and low-cost detection of minute angular misalignments in the negative electrode composite tape, and is characterized by high detection efficiency, high accuracy, and high precision, thereby improving the response speed of the control system and reducing the incidence of accidents. The misalignment angle is calculated using both a first image of the portion of the negative electrode composite tape that includes the first positioning hole and a second image of the portion of the negative electrode composite tape that includes the second positioning hole. Compared to detection using a single image, this method can expand the detection range, is suitable for larger negative electrode composite tapes, and allows for more accurate positioning of the positioning holes, resulting in higher detection accuracy.

[0024] In some embodiments, step S2310 includes step S2311 of detecting the areas of the first positioning hole and the second positioning hole based on the grayscale difference between the first positioning hole and the second positioning hole and the negative electrode plate coating area, and step S2312 of obtaining a first side edge of the first positioning hole and a second side edge of the second positioning hole using an edge detection algorithm.

[0025] By adopting the above detection method, the first side edge of the first positioning hole and the second side edge of the second positioning hole can be quickly positioned, the deviation angle can be easily calculated, and the detection efficiency, accuracy and precision can be improved.

[0026] In some embodiments, step S2312 includes step S2312a of shifting an edge detection ROI box to the area of ​​the first positioning hole and the area of ​​the second positioning hole; step S2312b of using an edge detection algorithm to obtain a first edge point on a first side edge of the first positioning hole and a second edge point on a second side edge of the second positioning hole; and step S2312c of fitting the obtained first edge points as a first straight line and determining the first straight line as the first side edge of the first positioning hole, and fitting the obtained second edge points as a second straight line and determining the second straight line as the second side edge of the second positioning hole.

[0027] By adopting the above detection method, the first side edge of the first positioning hole and the second side edge of the second positioning hole can be accurately extracted from the first image and the second image, respectively, resulting in fast edge detection, high fitting accuracy, and improved detection speed.

[0028] In some embodiments, step S2312a includes step S2312a1 of calculating a first center point coordinate of the detected first positioning hole region and a second center point coordinate of the detected second positioning hole region, and step S2312a2 of shifting the edge detection ROI box to the first positioning hole region and the second positioning hole region based on the first center point coordinate and the second center point coordinate, respectively.

[0029] By adopting the above detection method, the ROI box can be quickly positioned in the first positioning hole and the second positioning hole, which shortens the time required for edge detection, further improves the detection efficiency and accuracy, and increases the detection speed.

[0030] An embodiment of a second aspect of the present application provides a device for detecting misalignment of a negative electrode composite tape, the negative electrode composite tape including a negative electrode plate including a positioning hole and a separator attached to the surface of the negative electrode plate, the device for detecting misalignment including an image capturing device for capturing an image of a portion of the negative electrode composite tape including the positioning hole, and a controller, the controller receives the image captured by the image capturing device and includes a memory and a processor, the processor executes instructions stored in the memory to perform the method in the above embodiment.

[0031] The above-mentioned misalignment detection device can still effectively detect the positioning holes after the separator is combined with the negative electrode plate, improving the accuracy and precision of positioning hole identification and misalignment detection. Furthermore, by calculating the misalignment feature amount based on the image captured by the image capture device, the device also has the advantage of high detection efficiency, and can simultaneously detect any one or any combination of the misalignment amount in the width direction, the misalignment amount in the tape feed direction, and the misalignment angle, thereby reducing detection costs.

[0032] In some embodiments, the image capture device includes a camera positioned on a first side of the negative electrode composite tape and a light source positioned on a second side of the negative electrode composite tape opposite the first side.

[0033] The camera has a wide field of view and can capture a large area of ​​image around the positioning hole, so even if the positioning hole is partially blocked, it does not affect the detection of the deviation feature amount. This is characterized by high detection accuracy and precision.

[0034] In some embodiments, the light source is a red light source.

[0035] The red light source has a strong light transmission power and is particularly suitable for the negative electrode composite tape after it has been combined with the separator. This improves the resolution of the positioning holes in the image, enables accurate positioning of the positioning holes, and improves the accuracy of detecting deviation features.

[0036] An embodiment of a third aspect of the present application provides a transport device for a negative electrode composite tape, the negative electrode composite tape including a negative electrode plate including a positioning hole and a separator attached to the surface of the negative electrode plate, the transport device including the deviation detection device of the above embodiment and a control device communicatively connected to the deviation detection device, and the control device controls the operation of the transport device based on the deviation feature output by the deviation detection device.

[0037] By adopting the above-described negative electrode composite tape transport device, it is possible to quickly and accurately detect the characteristic deviation of the negative electrode composite tape transport, and the control equipment can respond in a timely manner to the deviation of the negative electrode composite tape, thereby reducing the occurrence of accidents.

[0038] An embodiment of a fourth aspect of the present application provides a computer-readable storage medium having executable instructions stored thereon, the instructions, when executed by a processor, causing the processor to perform the method in the above embodiment.

[0039] The above description is merely a summary of the technical solution of the present application, which may be implemented according to the contents of the specification in order to more clearly understand the technical means of the present application. In order to make the above and other objectives, features and advantages of the present application more clearly understandable, the following particularly cites specific embodiments of the present application to describe them. [Brief explanation of the drawings]

[0040] In the drawings, unless otherwise specified, the same reference numerals in several drawings represent the same or similar parts or elements. The drawings are not necessarily drawn to scale. It should be understood that the drawings illustrate only some embodiments according to the disclosure of the present application and should not be considered as limitations on the scope of the present application. [Figure 1] FIG. 2 is a schematic diagram of a negative electrode composite tape according to some embodiments of the present application. [Figure 2] FIG. 2 is a schematic diagram of a negative electrode plate according to some embodiments of the present application. [Figure 3] FIG. 1 is a schematic diagram of a positive electrode insertion according to some embodiments of the present application. [Figure 4] 1 is a flowchart of a method for detecting deviation of a negative electrode composite tape according to some embodiments of the present application. [Figure 5] 10 is a flowchart illustrating calculation of widthwise displacement based on an image according to some embodiments of the present application. [Figure 6] FIG. 10 is a schematic diagram of calculating the widthwise displacement amount based on an image according to some embodiments of the present application. [Figure 7] 10 is a flowchart illustrating a process for locating an edge of a negative plate coating area parallel to the tape transport direction based on an image according to some embodiments of the present application. [Figure 8] 10A and 10B are schematic diagrams illustrating image-based positioning of the edge of the negative plate coating area parallel to the tape transport direction in some embodiments of the present application. [Figure 9] 10 is a flowchart for determining the edge of a negative plate coating area parallel to the tape transport direction based on a circumscribing rectangle according to some embodiments of the present application. [Figure 10] FIG. 10 is a schematic diagram of determining the edge of the negative electrode plate coating area parallel to the tape transport direction based on a circumscribing rectangle in some embodiments of the present application. [Figure 11] 10 is a flowchart illustrating shifting an edge detection ROI box to an initial positioning edge according to some embodiments of the present application. [Figure 12] 10 is a flowchart illustrating calculation of the amount of deviation in the tape transport direction based on an image according to some embodiments of the present application. [Figure 13] 10A and 10B are schematic diagrams illustrating calculation of the amount of deviation in the tape transport direction based on an image according to some embodiments of the present application. [Figure 14] 10 is a flowchart illustrating locating side edges of tooling holes parallel to the width direction based on an image according to some embodiments of the present application. [Figure 15] 10 is a flowchart illustrating an edge detection algorithm for obtaining side edges of a tooling hole parallel to the width direction according to some embodiments of the present application. [Figure 16] 10 is a flowchart for shifting an edge detection ROI box to an area of ​​a tooling hole according to some embodiments of the present application. [Figure 17] 10 is a flowchart illustrating calculation of a misalignment angle based on an image according to some embodiments of the present application. [Figure 18] FIG. 2 is a schematic diagram of acquiring a first image and a second image according to some embodiments of the present application. [Figure 19] FIG. 2 is a schematic diagram of a negative electrode plate according to some embodiments of the present application. [Figure 20] FIG. 1 is a schematic diagram of calculating a misalignment angle based on an image according to some embodiments of the present application; [Figure 21] 10 is a flowchart illustrating locating a first side edge of a first positioning hole based on a first image and locating a second side edge of a second positioning hole based on a second image in some embodiments of the present application. [Figure 22] 10 is a flowchart illustrating an edge detection algorithm for obtaining a first side edge of a first tooling hole and a second side edge of a second tooling hole according to some embodiments of the present application. [Figure 23] 10 is a flowchart illustrating shifting an edge detection ROI box to a region of a first tooling hole and a region of a second tooling hole according to some embodiments of the present application. [Figure 24]10 is a flowchart of a method for detecting deviation of a negative electrode composite tape according to some other embodiments of the present application. [Figure 25] FIG. 2 is a schematic diagram of a negative electrode composite tape displacement detection device according to some embodiments of the present application. [Figure 26] 1 is a schematic diagram of an image acquisition device according to some embodiments of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0041] The following describes in detail the embodiments of the technical solution of the present application in conjunction with the drawings. The following embodiments are only used to more clearly explain the technical solution of the present application, and are merely examples, which do not limit the protection scope of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of this application, and the terms used herein are only for describing specific embodiments and are not intended to limit this application. The terms "comprises" and "having" and any variations thereof in the specification and claims of this application and the description of the drawings above are intended to cover a non-exclusive "comprise."

[0043] In the description of the embodiments of the present application, the technical terms "first," "second," etc. are only intended to distinguish between different objects, and cannot be understood to indicate or imply relative importance, or to imply the number, specific order, or hierarchical relationship of the technical features shown. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise clearly and specifically limited.

[0044] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. Appearances of this phrase in various locations throughout the specification do not necessarily all refer to the same embodiment, nor are they mutually exclusive, independent, or alternative embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of this application, the term "and / or" is merely a relation describing related objects and indicates that three relations may exist. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. In addition, the character " / " in this specification generally indicates that the related objects before and after are in an "or" relationship.

[0046] In describing the embodiments of the present application, the term "plurality" refers to two or more (including two); similarly, "sets" refers to two or more (including two sets); and "plurality" refers to two or more (including two).

[0047] In describing the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of the embodiments of the present application. They do not indicate or imply that the devices or elements referred to have a specific orientation or must be configured and operated in a specific orientation, and therefore should not be understood as limitations on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly defined or limited, the technical terms "attached," "connected," "connected," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to the specific circumstances.

[0049] In the battery core forming process, lamination molding has the advantages of higher rate and higher energy density compared to winding molding.Compared to conventional lamination machines, the negative electrode continuous lamination machine can form the negative electrode tape for the entire battery core by simply cutting the end sheet, thereby reducing the potential risk of edge cutting in the laminated battery core.

[0050] Referring to Figures 1 to 3, in a continuous negative electrode lamination machine, a separator 12 is attached to the surface of a negative electrode plate 11, followed by the formation of a negative electrode composite tape 1. To ensure accurate insertion of a positive electrode tape 2 at a positive electrode insertion position 3 and ensure the overall molding quality of the laminated battery core, the negative electrode composite tape 1 must be fed in a predetermined direction. To improve the accuracy of the insertion position of the positive electrode tape 2, a positioning hole 13 is always provided on the negative electrode plate 11, and the position of the positioning hole 13 is detected to detect whether the negative electrode composite tape 1 is misaligned during feeding. However, because the separator 12 is already attached to the negative electrode plate 11 during this process, contamination on the separator 12, burrs caused by die-cutting the positioning hole 13, and deformation of the positioning hole 13 after rolling the negative electrode plate 11 can all lead to sensor detection errors. As a result, it is very difficult to accurately detect the position of the positioning hole 13 using conventional sensor detection methods, resulting in a high risk of missed detection or false detection.

[0051] In light of the above technical problems, the inventors conducted extensive research and have now provided a method for detecting misalignment of a negative electrode composite tape 1. Referring to Figures 1 to 4, the negative electrode composite tape 1 includes a negative electrode plate 11 including a positioning hole 13 and a separator 12 attached to the surface of the negative electrode plate 11. The method for detecting misalignment of the negative electrode composite tape 1 includes step S1000 of acquiring an image 4 of a portion of the negative electrode composite tape 1 including the positioning hole 13, and step S2000 of calculating, based on image 4, a misalignment feature amount that indicates the distance and / or angle of misalignment of the negative electrode composite tape 1 in a specific direction.

[0052] The negative electrode plate 11 is an electrode plate on which a negative electrode active material is placed, and the area coated with the negative electrode active material forms a negative electrode plate coating area 14. The positioning hole 13 is a feature on the negative electrode plate 11 that can serve as a positioning and identification function. As can be understood, the positioning hole 13 may be any shape, such as a circle, a rectangle, or a square. In some embodiments, the positioning hole 13 is an elongated rectangle, with the long side of the positioning hole perpendicular to the tape feed direction of the negative electrode composite tape 1, thereby better serving as an identification function. In some embodiments, the positioning hole 13 is located in the negative electrode plate coating area 14. In some embodiments, the positioning hole 13 is located near the coating edge in the negative electrode plate coating area 14, thereby facilitating the collection and positioning of the image 4. In some embodiments, the positioning holes 13 are arranged equidistantly along a direction parallel to the tape feed direction on the negative electrode plate 11, thereby facilitating continuous detection of the positioning holes 13 and realizing real-time online monitoring of misalignment detection. The separator 12 is a film that separates the negative electrode plate 11 and the positive electrode tape 2 of the battery core and prevents short-circuiting between the positive and negative electrodes inside the battery. The deviation feature may be a vector indicating the deviation distance and / or angle in a specific direction of the negative electrode composite tape 1. The deviation feature may also be the deviation of an arbitrary feature of the negative electrode composite tape 1 relative to a reference point in the image 4. The feature may be an easily identifiable component of the negative electrode composite tape 1, such as a positioning hole 13 or the edge of the negative electrode plate coating region 14, while the reference point may be an arbitrary position in the image, such as the midpoint or contour line of the image 4. In some embodiments, when the difference between the deviation feature and a predetermined amount is greater than a threshold, a timely notification is provided by transmitting alarm information. The predetermined amount is the deviation of the position where the feature should arrive according to a predetermined transport setting relative to the reference point. In some embodiments, in response to the difference value between the deviation feature and the predetermined amount being greater than a threshold, the control system performs deviation correction based on the difference value between the deviation feature and the predetermined amount to achieve closed-loop control, thereby achieving automated detection and deviation correction.

[0053] The above-described misalignment detection method can still effectively detect the positioning holes 13 after the separator 12 is combined with the negative electrode plate 11, improving the accuracy and precision of misalignment detection. Furthermore, calculating the misalignment feature amount based on the image 4 also has the advantage of high detection efficiency, allowing the distance and / or angle of misalignment in a specific direction of the negative electrode composite tape 1 to be detected simultaneously, improving the detection speed, reducing the incidence of accidents, and cutting the detection cost.

[0054] According to some embodiments of the present application, the deviation characteristic amount includes any one or any combination of a deviation amount D1 in the width direction, a deviation amount D2 in the tape transport direction, and a deviation angle D3.

[0055] The widthwise deviation D1 is the amount of deviation feature in the widthwise direction, where the widthwise direction is the direction perpendicular to the tape feed direction of the negative electrode composite tape 1. The tape feed direction deviation D2 is the amount of deviation feature in the tape feed direction, where the tape feed direction is the feed direction of the negative electrode composite tape 1. The deviation angle D3 may be the angle deviation of any feature in the negative electrode composite tape 1 or a line connecting the any feature features with respect to a reference part in the image 4.

[0056] The misalignment state of the negative electrode composite tape 1 can be quickly determined by one or more of the three misalignment characteristics: the misalignment amount D1 in the width direction, the misalignment amount D2 in the tape conveying direction, and the misalignment angle D3, making it easy to correct the misalignment.

[0057] According to some embodiments of the present application, referring to FIGS. 5 and 6, the deviation feature amount includes a widthwise deviation amount D1, and step S2000 includes step S2100 of calculating the widthwise deviation amount D1, in which step S2100 calculates an edge L of the negative electrode plate coating region 14 parallel to the tape feeding direction based on image 4. a and a step S2110 of positioning the center point O of the image 4 and the width direction midline L parallel to the width direction. b and step S2120 of calculating the width direction midline L of image 4. band the edge L of the negative electrode plate coating area 14 parallel to the tape transport direction. a and step S2140 of calculating the distance between the center point O and the intersection point A as the amount of deviation D1 in the width direction.

[0058] Continuing to refer to FIG. 6, in some embodiments, the x direction in FIG. 6 is defined as the tape transport direction, and the y direction perpendicular to the x direction is defined as the width direction. In the acquired image 4, the edge L of the negative electrode plate coating region 14 parallel to the x direction, which is the tape transport direction, is a In some embodiments, the acquired image 4 further includes an edge of the negative electrode composite tape 1 parallel to the x-direction, which is the tape transport direction. The center point O of the image 4 is the intersection point of the diagonal lines of the image 4. A width direction midline L parallel to the y-direction, which is the width direction, is also included. b is the midline of image 4 that passes through center point O of image 4 and is parallel to the y direction, which is the width direction. In some embodiments, in response to the absolute value of the difference between width direction misalignment D1 and a predetermined width direction misalignment being greater than a threshold, warning information is transmitted to issue a warning. In some embodiments, in response to the difference between width direction misalignment D1 and the predetermined width direction misalignment being greater than the threshold, a control system performs width direction misalignment correction based on the difference between width direction misalignment D1 and the predetermined width direction misalignment, thereby achieving automated detection and misalignment correction.

[0059] By adopting the above detection method, the widthwise deviation D1 of the negative electrode composite tape 1 can be detected quickly and efficiently, and has the characteristics of high detection efficiency, high accuracy, and high precision, which can improve the response speed of the control system and reduce the accident occurrence rate.

[0060] According to some embodiments of the present application, referring to FIGS. 7 and 8, step S2110 includes steps S2111 to extract the negative plate coating region 14 using a thresholding algorithm based on the grayscale difference between the negative plate coating region 14 and other regions of the negative composite tape 1, S2112 to fit a circumscribing rectangle R of the extracted negative plate coating region 14, and S2113 to fit an edge L of the negative plate coating region 14 parallel to the tape feed direction based on the circumscribing rectangle R. a and a step S2113 of determining

[0061] The negative plate coating region 14, coated with the negative active material, exhibits a different grayscale in the image 4 from the transparent separator 12. Therefore, the negative plate coating region 14 can be quickly extracted based on the grayscale difference between the negative plate coating region 14 and other regions of the negative electrode composite tape 1. The threshold processing algorithm uses the threshold operator of the HALCON platform to extract regions whose grayscale values ​​fall within a predetermined numerical range as the negative plate coating region 14. In some embodiments, the predetermined numerical range for grayscale value extraction is 0-20. In some embodiments, step S2111 includes step S2111a of determining whether the grayscale difference between regions in image 4 is greater than a threshold value; step S2111b of extracting regions whose grayscale values ​​are in a predetermined numerical range in response to the grayscale difference between regions in image 4 being greater than the threshold value; and step S2111c of sending alarm information to a control system to indicate that the negative electrode plate coating region 14 has not been found in response to the grayscale difference between regions in image 4 being less than the threshold value or there being no regions whose grayscale values ​​are in the predetermined numerical range.

[0062] When the above detection method is adopted, the edge L of the negative electrode plate coating area 14 parallel to the tape feeding direction is a This allows for quick positioning, facilitating calculation of the widthwise deviation D1, improving detection efficiency, and shortening detection time.

[0063] According to some embodiments of the present application, referring to FIGS. 9 and 10, step S2113 includes step S2113a of setting the outer edge of the circumscribing rectangle R parallel to the tape feeding direction as the initial positioning edge, step S2113b of shifting the edge detection ROI box T to the initial positioning edge, step S2113c of acquiring edge points by an edge detection algorithm, and step S2113d of fitting the acquired edge points as a straight line and locating the straight line as an edge L of the negative electrode plate coating region 14 parallel to the tape feeding direction. a and step S2113d of determining:

[0064] In some embodiments, there is a determination between step S2113c and step S2113d, where if the number of edge points obtained by the edge detection algorithm exceeds a threshold number of edge points, the obtained edge points are fitted as a straight line, and if the number of edge points obtained by the edge detection algorithm is less than the threshold number of edge points, an alert information is sent to indicate an edge detection failure. In some embodiments, the threshold is set to 30. In some embodiments, abnormal edge points are filtered out, and the obtained edge points are fitted as a straight line using a least squares method.

[0065] By using the above detection method, from Image 4 negative Edge L of the electrode plate coating area 14 parallel to the tape transport direction a can be extracted accurately and quickly, resulting in fast edge detection and high fitting accuracy.

[0066] According to some embodiments of the present application, referring to Figures 10 and 11, step S2113b includes step S2113b1 of calculating the coordinates of the center point M of the initially positioned edge, and step S2113b2 of shifting the edge detection ROI box T to the initially positioned edge based on the coordinates of the center point M.

[0067] 10 , step S2113b2 includes shifting a center point N of the edge-detection ROI box T to a center point M of the initial positioning edge, where the center point N of the edge-detection ROI box T is the intersection point of the lines connecting the diagonals of the edge-detection ROI box T. In some embodiments, the coordinates of the center point M of the initial positioning edge are defined as (X0, Y0), where X0 is the abscissa of the center point M and Y0 is the ordinate of the center point M, and the length of the edge-detection ROI box T is defined as D. p , width is D q It can be understood that after shifting the center point N of the edge detection ROI box T to the center point M of the initial positioning edge, the coordinates of the center point N of the edge detection ROI box T are the same as the coordinates of the center point M of the initial positioning edge, which are both (X0, Y0), and the U, V, W, and Z coordinates of the four vertices of the edge detection ROI box T are respectively (X0-D p / 2,Y0-D q / 2), (X0-D p / 2,Y0+D q / 2), (X0+D p / 2,Y0+D q / 2), (X0+D p / 2,Y0-D q / 2). As can be seen, the length and width of the edge detection ROI box T may be set as needed.

[0068] When the above detection method is adopted, Edge detection The ROI box T can be quickly positioned at the initial positioning edge, shortening the time required for edge detection, reducing control risks, and further improving detection efficiency and accuracy.

[0069] According to some embodiments of the present application, referring to FIGS. 12 and 13, the deviation feature amount includes a deviation amount D2 in the tape feed direction, and step S2000 includes step S2200 of calculating the deviation amount D2 in the tape feed direction, and step S2200 includes calculating a side edge L of the positioning hole 13 parallel to the width direction based on image 4. cand a step S2210 of positioning the center point O of the image and the tape feed direction midline L parallel to the tape feed direction. d and step S2220 for calculating the tape feed direction midline L of image 4. d and the side edge L of the positioning hole 13 parallel to the width direction c and step S2240 of calculating the distance between the center point O and the intersection point C as the deviation amount D2 in the tape feed direction.

[0070] Continuing to refer to FIG. 13, in some embodiments, the x direction in FIG. 13 is defined as the tape transport direction, and the y direction perpendicular to the x direction is defined as the width direction. d is a line that passes through the center point O of the image 4 and is parallel to the y direction, which is the tape feeding direction. When the positioning hole 13 is circular, the side edge L of the positioning hole 13 that is positioned based on the image 4 and is parallel to the width direction is c is an edge line that is in contact with the positioning hole 13 and is parallel to the width direction. When the positioning hole 13 is rectangular or square, the side edge L that is parallel to the width direction of the positioning hole 13 that is positioned based on the image 4 is c The side edge L is a side edge line of the positioning hole 13 that is parallel to the width direction. c may be the inner or outer edge of the positioning hole 13 parallel to the width direction. c is an outer edge of the positioning hole 13 parallel to the width direction. In some embodiments, in response to the absolute value of the difference between the deviation amount D2 in the tape feed direction and the deviation amount in the predetermined tape feed direction being greater than a threshold value, alarm information is transmitted to issue an alarm. In some embodiments, in response to the absolute value of the difference between the deviation amount D2 in the tape feed direction and the deviation amount in the predetermined tape feed direction being greater than a threshold value, the control system corrects the deviation in the tape feed direction based on the difference between the deviation amount D2 in the tape feed direction and the deviation amount in the predetermined tape feed direction, thereby realizing automated detection and correction of the deviation.

[0071] By adopting the above detection method, it is possible to simultaneously detect the widthwise deviation D1 of the negative electrode composite tape 1 and the deviation D2 in the tape feed direction in one image, which has the characteristics of high detection efficiency, high accuracy, and high precision, thereby improving the detection speed and reducing the incidence of accidents.

[0072] According to some embodiments of the present application, referring to FIG. 14, step S2210 includes step S2211 of detecting the area of ​​the positioning hole 13 based on the grayscale difference between the positioning hole 13 and the negative electrode plate coating area 14, and step S2212 of detecting the side edge L of the positioning hole 13 parallel to the width direction using an edge detection algorithm. c and a step S2212 of acquiring the value.

[0073] The positioning holes 13 have been processed, and therefore exhibit a different grayscale from the negative electrode plate coating region 14 where the negative electrode active material is coated. Therefore, based on the grayscale difference between the positioning holes 13 and the negative electrode plate coating region 14, the positioning holes 13 can be quickly detected in the image 4. Regions where the grayscale value falls within a predetermined range are extracted as the regions of the positioning holes 13. In some embodiments, the predetermined range for grayscale value extraction is greater than 50. In some embodiments, step S2211 includes step S2211a of determining whether the extracted negative plate coating region 14 includes a region whose grayscale value is greater than a predetermined numerical range; step S2211b of extracting this region in response to the presence of a region whose grayscale value is greater than the predetermined numerical range in the negative plate coating region 14; step S2211c of determining whether the extracted region matches the size of the positioning hole; step S2211d of proceeding to step S2212 in response to the region matching the size of the positioning hole; and step S2211e of sending alarm information to the control system to indicate that the positioning hole 13 has not been found in response to the absence of a region in the negative plate coating region 14 whose grayscale value is greater than the predetermined numerical range or the extracted region does not match the size of the positioning hole 13.

[0074] When the above detection method is adopted, the side edge L of the positioning hole 13 parallel to the width direction c This allows for quick positioning, facilitating calculation of the amount of deviation D2 in the tape feed direction, improving detection efficiency, and shortening detection time.

[0075] According to some embodiments of the present application, referring to FIG. 15, step S2212 includes steps S2212a to shift the edge detection ROI box T to the area of ​​the positioning hole 13, and step S2212b to detect the side edges L of the positioning hole 13 parallel to the width direction using an edge detection algorithm. c Step S2212b: acquiring edge points of the side edge L of the positioning hole 13, which is parallel to the width direction, and fitting the acquired edge points as a straight line. c and step S2212c of determining:

[0076] In some embodiments, there is a determination between step S2212b and step S2212c, where if the number of edge points obtained by the edge detection algorithm is greater than or equal to the edge point threshold, the obtained edge points are fitted as a straight line, and if the number of edge points obtained by the edge detection algorithm is less than the edge point threshold, an alert information is sent to indicate edge detection failure. In some embodiments, abnormal edge points are filtered out, and the obtained edge points are fitted as a straight line using the least squares method.

[0077] When the above detection method is adopted, the side edge L of the positioning hole 13 parallel to the width direction can be seen from the image 4. c This allows accurate extraction, enabling fast edge detection and improved fitting accuracy.

[0078] According to some embodiments of the present application, referring to FIG. 16, step S2212a includes step S2212a1 of calculating the center point coordinates of the area of ​​the detected positioning hole 13, and step S2212a2 of shifting the edge detection ROI box T to the area of ​​the positioning hole 13 based on the center point coordinates.

[0079] In some embodiments, the center point coordinates of the region of the positioning hole 13 are defined as (X1, Y1), and step S2212a2 includes shifting the center point N of the edge-detection ROI box T to the center point coordinates (X1, Y1) of the region of the positioning hole 13, where the center point N of the edge-detection ROI box T is the intersection of the lines connecting the diagonals of the edge-detection ROI box T. The length of the edge-detection ROI box T is D p , width is D q It can be understood that after the center point N of the edge detection ROI box T is shifted to the center point of the area of ​​the positioning hole 13, the coordinates of the center point N of the edge detection ROI box T are the same as the coordinates of the center point of the area of ​​the positioning hole 13, which are both (X1, Y1), and the U, V, W, and Z coordinates of the four vertices of the edge detection ROI box T are respectively (X1-D p / 2,Y1-D q / 2), (X1-D p / 2,Y1+D q / 2), (X1+D p / 2,Y1+D q / 2), (X1+D p / 2,Y1-D q / 2). As can be seen, the length and width of the edge detection ROI box T may be set as needed.

[0080] When the above detection method is adopted, Edge detection The ROI box T can be quickly positioned in the positioning hole, shortening the time required for edge detection and further improving the detection efficiency and accuracy.

[0081] According to some embodiments of the present application, referring to FIGS. 17 to 20, the negative electrode plate 11 includes a first positioning hole 13-1 and a second positioning hole 13-2, and the first positioning hole 13-1 and the second positioning hole 13-2 are spaced apart along the width direction and are respectively aligned with a first side edge L parallel to the width direction. c -1 and the second side edge L c -2 and a first side edge L c -1 and the second side edge L c -2 are collinearly positioned, where step S1000 includes acquiring a first image of a portion of negative electrode composite tape 1 that includes first positioning hole 13-1 and a second image of a portion of negative electrode composite tape 1 that includes second positioning hole 13-2, where the deviation feature amount includes deviation angle D3, and step S2000 includes step S2300 of calculating deviation angle D3, where step S2300 includes step S2400 of calculating a first side edge L of first positioning hole 13-1 based on the first image. c -1 is positioned, and the second side edge L of the second positioning hole 13-2 is determined based on the second image. c Step S2310 of positioning first side edge L c -1 and the second side edge L c -2, fitting the first side edge L c -1 and the second side edge L c Line L connecting to -2 e Step S2320 to obtain the line L e and the reference line as a deviation angle D3, where the reference line is a contour line L that is parallel to the tape transport direction and is parallel to the first image or the second image. f is.

[0082] As can be seen, the first side edge L c -1 and the second side edge L c -2 are arranged parallel and collinear in the width direction, c -1 and the second side edge L cThis means that the first and second positioning holes 13-1 and 13-2 are both located on one side of the positioning hole 13, both on the side of the positioning hole 13 that points in the tape feed direction of the negative composite tape 1, or both on the side of the positioning hole 13 that faces away from the tape feed direction of the negative composite tape 1. In some embodiments, the portion of the negative composite tape 1 that includes the first positioning hole 13-1 and the portion of the negative composite tape 1 that includes the second positioning hole 13-2 are symmetrical about the longitudinal center axis of the negative plate coating region 14 in the tape feed direction. In some embodiments, the first positioning hole 13-1 and the second positioning hole 13-2 are symmetrical about the longitudinal center axis of the negative plate coating region 14 in the tape feed direction. In some embodiments, a first image of the portion of the negative composite tape 1 that includes the first positioning hole 13-1 and a second image of the portion of the negative composite tape 1 that includes the second positioning hole 13-2 are acquired simultaneously. In some embodiments, in response to the inability to acquire the first image and the second image simultaneously, alarm information is transmitted to issue an alarm. In some embodiments, step S2320 includes: c -1 and the second side edge L c The edge points of -2 are mapped to the same spatial coordinate system using the joint calibration model, and the mapped edge points are fitted using the least squares method to form the connecting line L. e In some embodiments, in response to the absolute value of the difference between the deviation angle D3 and the predetermined angle being greater than a threshold, alarm information is transmitted to issue an alarm. In some embodiments, in response to the absolute value of the difference between the deviation angle D3 and the predetermined angle being greater than a threshold, the control system performs deviation correction based on the difference between the deviation angle D3 and the predetermined angle to achieve closed-loop control, thereby achieving automated detection and deviation correction.

[0083] The above detection method allows for quick, efficient, and low-cost detection of minute angular misalignments in the negative electrode composite tape 1, and is characterized by high detection efficiency, high accuracy, and high precision, thereby improving the response speed of the control system and reducing the incidence of accidents. The misalignment angle D3 is calculated using both a first image of the portion of the negative electrode composite tape 1 that includes the first positioning hole 13-1 and a second image of the portion of the negative electrode composite tape 1 that includes the second positioning hole 13-2. Compared to detection using a single image, this method has a wider detection range, is suitable for larger dimensions of the negative electrode composite tape 1, and allows for more accurate positioning of the positioning hole 13, resulting in higher detection accuracy.

[0084] According to some embodiments of the present application, referring to FIG. 21 , step S2310 includes step S2311 of detecting the area of ​​the first positioning hole 13-1 and the area of ​​the second positioning hole 13-2 based on the grayscale difference between the first positioning hole 13-1 and the second positioning hole 13-2 and the negative electrode plate coating area 14; and step S2312 of detecting the first side edge L of the first positioning hole 13-1 using an edge detection algorithm. c -1 and the second side edge L of the second positioning hole 13-2 c and a step S2312 of acquiring -2.

[0085] For the method of extracting the first positioning hole 13-1 and the second positioning hole 13-2, see step S2211.

[0086] When the above detection method is adopted, the first side edge L of the first positioning hole 13-1 c -1 and the second side edge L of the second positioning hole 13-2 c -2 can be positioned quickly, the calculation of the deviation angle D3 can be facilitated, and the detection efficiency, accuracy and precision can be improved.

[0087] According to some embodiments of the present application, referring to FIG. 22, step S2312 includes steps S2312a and S2312b of shifting an edge detection ROI box T to the area of ​​the first positioning hole 13-1 and the area of ​​the second positioning hole 13-2, and using an edge detection algorithm to detect a first side edge L of the first positioning hole 13-1. c -1 and the second side edge L of the second positioning hole 13-2 c Step S2312b: acquiring a second edge point of the first positioning hole 13-1; fitting the acquired first edge point as a first straight line; and connecting the first straight line to the first side edge L of the first positioning hole 13-1. c -1, and the acquired second edge point is fitted as a second straight line, and the second straight line is connected to the second side edge L of the second positioning hole 13-2. c and step S2312c of determining the value as -2.

[0088] First side edge L c -1 and the second side edge L c For the fitting method of -2, see step S2212.

[0089] When the above detection method is adopted, the first side edge L of the first positioning hole 13-1 can be detected from the first image and the second image. c -1 and the second side edge L of the second positioning hole 13-2 c -2 can be accurately extracted, and edge detection is fast, fitting accuracy is high, and detection speed can be improved.

[0090] According to some embodiments of the present application, referring to FIG. 23, step S2312a includes step S2312a1 of calculating a first center point coordinate of the detected area of ​​the first positioning hole 13-1 and a second center point coordinate of the area of ​​the second positioning hole 13-2, and step S2312a2 of shifting the edge detection ROI box T to the area of ​​the first positioning hole 13-1 and the area of ​​the second positioning hole 13-2 based on the first center point coordinate and the second center point coordinate, respectively.

[0091] For the method of shifting the edge detection ROI box T, see step S2212a.

[0092] When the above detection method is adopted, Edge detection The ROI box T can be quickly positioned in the first positioning hole 13-1 and the second positioning hole 13-2, shortening the time required for edge detection, further improving the detection efficiency and accuracy, and increasing the detection speed.

[0093] According to some embodiments of the present application, referring to FIG. 24 , a method for detecting a deviation of a negative electrode composite tape 1 includes acquiring an image 4 of a portion of the negative electrode composite tape 1 including a positioning hole 13, extracting an outer edge of the negative electrode plate coating region 14 parallel to the tape feeding direction as an initial positioning edge, shifting an edge detection ROI box T to the initial positioning edge in response to successful extraction of the initial positioning edge, and transmitting alarm data to a control device in response to failure to extract the initial positioning edge, and detecting an edge L of the negative electrode plate coating region 14 parallel to the tape feeding direction by an edge detection algorithm. a and the edge L of the negative electrode plate coating area 14 parallel to the tape conveying direction. a In response to the successful fitting of b and the edge L of the negative electrode plate coating area 14 parallel to the tape transport direction. a The distance between the intersection of the negative electrode plate coating area 14 and the edge L parallel to the tape feed direction is calculated, and this distance is set as the width direction deviation amount D1. a detecting the region of the positioning hole 13 in the image 4; shifting the edge detection ROI box T to the region of the positioning hole 13 in response to successful extraction of the region of the positioning hole 13 in the image 4; sending alarm data to the control device in response to failure of extraction of the region of the positioning hole 13 in the image 4; cand the side edge L of the positioning hole 13 parallel to the width direction. c In response to the successful fitting of d and the side edge L of the positioning hole 13 parallel to the width direction c and a distance D2 between the first image and the intersection point of the first image and the second image, and the distance D2 is set as the amount of deviation in the tape transport direction. In response to a failure in fitting of the side edge of the positioning hole parallel to the width direction, alarm data is transmitted to the control device. In response to successful acquisition of both the first image and the second image, alarm data is transmitted to the control device. c -1 and the second side edge of the second image L c -2 edge point data are collected and mapped to the same world coordinate system; in response to unsuccessful acquisition of the first image or the second image, alarm data is transmitted to a control device; and the first side edge L is calculated using a least squares method. c -1 and the second side edge L c Fitting the edge point data of -2, the first side edge L c -1 and the second side edge L c Line L connecting to -2 e and connect the lines L e and a contour line L parallel to the first image or the second image and parallel to the tape transport direction. f and calculating an angle D3 between the reference line and the distance D3, setting this angle as the deviation angle, calculating a difference value between the distance and angle and a predetermined amount, and transmitting the difference value to the control device.

[0094] According to some embodiments of the present application, referring to Figures 1, 2 and 25, there is provided a displacement detection device for a negative electrode composite tape 1, wherein the negative electrode composite tape 1 includes a negative electrode plate 11 including a positioning hole 13 and a separator 12 attached to the surface of the negative electrode plate 11, and the displacement detection device includes an image capture device 5 for capturing an image 4 of a portion of the negative electrode composite tape 1 including the positioning hole 13, and a controller (not shown), wherein the controller receives the image 4 captured by the image capture device 5 and includes a memory and a processor, and the processor executes instructions stored in the memory to perform the method in any one of the embodiments.

[0095] The above-described misalignment detection device can still effectively detect the positioning holes 13 after the separator 12 is combined with the negative electrode plate 11, improving the accuracy and precision of misalignment detection. Furthermore, by calculating the misalignment feature amount based on the image 4 acquired by the image acquisition device 5, the device also has the advantage of high detection efficiency, and can simultaneously detect any one or any combination of the misalignment amount D1 in the width direction, the misalignment amount D2 in the tape feed direction, and the misalignment angle D3, thereby reducing detection costs.

[0096] According to some embodiments of the present application, referring to FIG. 26, the image capture device 5 includes a camera 51 installed on a first side of the negative electrode composite tape 1 and a light source 52 installed on a second side of the negative electrode composite tape 1 opposite the first side.

[0097] The camera 51 may be any device capable of collecting images, such as an industrial camera, an area camera, etc. The light source 52 may be any light source capable of illuminating the negative electrode composite tape 1, such as a laser light. In some embodiments, the light beam emitted from the light source 52 is focused onto the positioning hole 13 and used to illuminate the cut hole. In some embodiments, the image acquisition device 5 further includes a prism 53 to change the angle of incidence of the light beam.

[0098] The camera has a wide field of view and can capture a large area of ​​image around the positioning hole, so even if the positioning hole is partially blocked, it does not affect the detection of the deviation feature amount. This is characterized by high detection accuracy and precision.

[0099] In some embodiments, light source 52 is a red light source.

[0100] The wavelength of red light is between 625 and 740 nanometers (nm), which is the longest wavelength color light among visible light, and is particularly suitable for negative electrode composite tape 1 after being combined with separator 12.

[0101] In some embodiments, the light source 52 has a high illuminance, for example, 100,000 liters. x This can further improve the detection effect of the detected image.

[0102] The red light source has a strong light transmission power, which improves the resolution of the positioning holes 13 in the image 4, realizes accurate positioning of the positioning holes 13, and improves the accuracy of detecting deviation feature amounts.

[0103] According to some embodiments of the present application, there is provided a transport device for a negative electrode composite tape 1, the negative electrode composite tape 1 including a negative electrode plate 11 including a positioning hole 13 and a separator 12 attached to the surface of the negative electrode plate 11, the transport device including a deviation detection device according to any one of the embodiments and a control device communicatively connected to the deviation detection device, and the control device controls the operation of the transport device based on the deviation feature output by the deviation detection device.

[0104] By adopting the above-described negative electrode composite tape transport device, it is possible to quickly and accurately detect the characteristic deviation of the negative electrode composite tape transport, and the control equipment can respond in a timely manner to the deviation of the negative electrode composite tape, thereby reducing the occurrence of accidents.

[0105] According to some embodiments of the present application, a computer-readable storage medium is provided, and executable instructions are stored on the computer-readable storage medium, which, when executed by a processor, cause the processor to perform the method in any one of the embodiments.

[0106] Finally, it should be noted that the above examples are merely illustrative of the technical solutions of the present application and are not intended to be limiting. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the technical solutions described in the above examples may still be modified or some or all of the technical features may be replaced with equivalents. Such modifications or replacements do not deviate from the essence of the relevant technical solutions from the scope of the technical solutions of the examples of the present application, and should be included in the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in the examples may be combined in any manner. The present application is not limited to the specific examples disclosed in the description, but includes all technical solutions included within the scope of the claims. [Explanation of symbols]

[0107] 1 negative electrode composite tape, 11 negative electrode plate, 12 separator, 121 separator edge, 13 positioning hole, 13-1 first positioning hole, 13-2 second positioning hole, 14 negative electrode plate coating area, 2 positive electrode tape, 3 positive electrode insertion position, D1 width direction deviation amount, D2 tape feed direction deviation amount, D3 deviation angle, 4 image, 41 image edge, O center point, L a Edge, L b Width direction median line, R Circumscribed rectangle, L c Side edge, L d Tape feed direction center line, L e A line connecting the first side edge and the second side edge, L f Contour line, L c -1 first side edge, L c -2 second side edge, 5 image acquisition device, 51 camera, 52 light source, 53 prism

Claims

1. A method for detecting misalignment of a negative electrode composite tape, the negative electrode composite tape including a negative electrode plate and a separator attached to a surface of the negative electrode plate, the method for detecting misalignment comprising: Step S1000: acquiring an image of the negative electrode composite tape; and a step S2000 of calculating a displacement feature amount based on the image; The displacement feature amount includes a displacement amount in the width direction, and step S2000 includes step S2100 of calculating the displacement amount in the width direction, and step S2100 includes: Step S2110: locating an edge of the negative electrode plate coating area parallel to the tape transport direction based on the image; A step S2120 of calculating a center point and a width direction midline parallel to the width direction of the image; A step S2130 of calculating an intersection between a width direction midline of the image and an edge of the negative electrode plate coating area parallel to the tape feed direction; and calculating a distance between the center point and the intersection point as the amount of misalignment in the width direction.

2. The step S2110 is Step S2111: extracting the negative plate coating area using a thresholding algorithm based on the grayscale difference between the negative plate coating area and other areas of the negative composite tape; Step S2112: fitting a circumscribing rectangle of the extracted negative electrode plate coating area; 2. The method for detecting misalignment according to claim 1, further comprising: a step S2113 of determining an edge of the negative electrode plate coating area that is parallel to the tape feed direction based on the circumscribing rectangle.

3. The step S2113 is Step S2113a: setting the outer edge of the circumscribing rectangle parallel to the tape transport direction as the initial positioning edge; a step S2113b of shifting an edge detection ROI box to the initial positioning edge; Step S2113c of obtaining edge points using an edge detection algorithm; The deviation detection method according to claim 2, further comprising a step S2113d of fitting the acquired edge points as a straight line and determining the straight line as an edge of the negative electrode plate coating region that is parallel to the tape transport direction.

4. Step S2113b Step S2113b1 of calculating the center point coordinates of the initial positioning edge; The displacement detection method according to claim 3 , further comprising a step S2113 b 2 of shifting an edge detection ROI box to the initial positioning edge based on the center point coordinates.

5. A method for detecting a misalignment of a negative electrode composite tape, the negative electrode composite tape including a negative electrode plate and a separator attached to a surface of the negative electrode plate, the method for detecting a misalignment comprising: Step S1000: acquiring an image of the negative electrode composite tape; and a step S2000 of calculating a displacement feature amount based on the image; The negative electrode plate includes a positioning hole, the deviation feature amount includes a deviation amount in a tape feed direction, and step S1000 includes acquiring an image of a portion of the negative electrode composite tape including the positioning hole, and step S2000 includes step S2200 of calculating the deviation amount in the tape feed direction, and step S2200 Step S2210: positioning a side edge of the positioning hole parallel to the width direction based on the image; A step S2220 of calculating a center point of the image and a tape feed direction midline parallel to the tape feed direction; a step S2230 of calculating an intersection between a median line in the tape feed direction of the image and a side edge of the positioning hole parallel to the width direction; a step S2240 of calculating the distance between the center point and the intersection point as the amount of deviation in the tape transport direction.

6. The step S2210 is Step S2211: detecting the area of ​​the positioning hole based on the gray scale difference between the positioning hole and the negative electrode plate coating area; The method of claim 5, further comprising: a step S2212 of acquiring side edges of the positioning holes parallel to the width direction using an edge detection algorithm.

7. The step S2212 is a step S2212a of shifting an edge detection ROI box to the area of ​​the positioning hole; Step S2212b: obtaining edge points of side edges of the positioning holes parallel to the width direction using an edge detection algorithm; The deviation detection method according to claim 6, further comprising a step S2212c of fitting the acquired edge points as a straight line and determining the straight line as a side edge of the positioning hole parallel to the width direction.

8. Step S2212a Step S2212a1 of calculating the center point coordinates of the detected positioning hole area; The method for detecting a deviation according to claim 7, further comprising: a step S2212a2 of shifting an edge detection ROI box to the region of the positioning hole based on the center point coordinates.

9. A method for detecting a misalignment of a negative electrode composite tape, wherein the negative electrode composite tape includes a negative electrode plate and a separator attached to a surface of the negative electrode plate, and the method for detecting a misalignment comprises: Step S1000: acquiring an image of the negative electrode composite tape; and a step S2000 of calculating a displacement feature amount based on the image; The negative electrode plate includes a first positioning hole and a second positioning hole, the first positioning hole and the second positioning hole are spaced apart along the width direction and have a first side edge and a second side edge parallel to the width direction, respectively, the first side edge and the second side edge are arranged collinearly; Here, step S1000 includes a step of acquiring a first image of a portion of the negative electrode composite tape that includes the first positioning hole and a second image of a portion of the negative electrode composite tape that includes the second positioning hole, Here, the displacement feature amount includes a displacement angle, and step S2000 includes step S2300 of calculating the displacement angle, and step S2300 includes: a step S2310 of locating a first side edge of the first positioning hole based on the first image and locating a second side edge of the second positioning hole based on the second image; a step S2320 of fitting the first side edge and the second side edge to obtain a line connecting the first side edge and the second side edge; a step S2330 of calculating an angle between the connecting line and a reference line as the deviation angle; Here, the reference line is a contour line that is parallel to the first image or the second image and parallel to the tape feed direction.

10. The step S2310 is Step S2311: detecting the area of ​​the first positioning hole and the area of ​​the second positioning hole based on the gray scale difference between the first positioning hole and the second positioning hole and the negative electrode plate coating area; 10. The method of claim 9, further comprising: utilizing an edge detection algorithm to obtain a first side edge of the first tooling hole and a second side edge of the second tooling hole.

11. The step S2312 is a step S2312a of shifting an edge detection ROI box to the area of ​​the first positioning hole and the area of ​​the second positioning hole; In step S2312b, an edge detection algorithm is used to obtain a first edge point of a first side edge of the first tooling hole and a second edge point of a second side edge of the second tooling hole; A deviation detection method as described in claim 10, including step S2312c of fitting the acquired first edge points as a first straight line and determining the first straight line as a first side edge of the first positioning hole, and fitting the acquired second edge points as a second straight line and determining the second straight line as a second side edge of the second positioning hole.

12. Step S2312a A step S2312a1 of calculating a first center point coordinate of the detected first positioning hole area and a second center point coordinate of the detected second positioning hole area; The deviation detection method of claim 11, further comprising a step S2312a2 of shifting an edge detection ROI box to the area of ​​the first positioning hole and the area of ​​the second positioning hole based on the first center point coordinates and the second center point coordinates, respectively.

13. A displacement detection device for a negative electrode composite tape, the negative electrode composite tape including a negative electrode plate and a separator attached to a surface of the negative electrode plate, the displacement detection device comprising: an image capture device for capturing an image of the negative electrode composite tape; a controller configured to receive images captured by the image capture device, and a memory and a processor configured to execute instructions stored in the memory to perform the method of any one of claims 1 to 12.

14. The image acquisition device includes: a camera installed on a first side of the negative electrode composite tape; The misalignment detection device according to claim 13 , further comprising: a light source disposed on a second side of the negative electrode composite tape opposite to the first side.

15. The displacement detection device according to claim 14 , wherein the light source is a red light source.

16. A transport device for a negative electrode composite tape, the negative electrode composite tape including a negative electrode plate and a separator attached to a surface of the negative electrode plate, the transport device comprising: a deviation detection device according to claim 13; a control device communicatively connected to the deviation detection device, the control device controlling the operation of the transport device based on the deviation feature output by the deviation detection device.

17. 13. A computer-readable storage medium having executable instructions stored thereon, the instructions, when executed by a processor, causing the processor to perform the method of any one of claims 1 to 12.

Images