Strip feeding detection method, apparatus, laminating machine, equipment, and medium for laminating machine

Abstract

A strip feed detection method for a laminator, a strip feed detection device, a laminator, an electronic device, and a non-transitory computer readable storage medium. The strip 800, 1310, 1410, 1510, 1610, 1710, 1810 includes a plurality of first electrode sheets continuously distributed in a feed direction 104, 801, 1311, 1511, and the strip feed detection method includes: acquiring at least one strip image 500, 810, 820 by photographing with at least one set of photographing devices 1340, 1421, 1422, 1541, 1542, 1621, 1622, 1721, 1722, 1821, 1822; determining whether the strip image 500, 810, 820 includes a first mark and a second mark; and, in response to determining that the strip image 500, 810, 820 includes the first mark, acquiring a target deviation amount of the first mark relative to a predetermined position based on the strip image 500, 810, 820; controlling a strip feed detection device based on the deviation to calibrate the feed deviation for the strip 800, 1310, 1410, 1510, 1610, 1710, 1810 conveyed by the conveying mechanism, and controlling a cutting mechanism 1370, 1570 after calibrating the feed deviation to cut the strip 800, 1310, 1410, 1510, 1610, 1710, 1810 at the conveying mechanism; determining a complete first electrode sheet based on the first mark to ensure acquisition of a complete strip image 500, 810, 820; determining the feed deviation based on the first mark, and the second mark is used to indicate a composite position in the strip 800, 1310, 1410, 1510, 1610, 1710, 1810 of the second electrode sheet having a polarity opposite to that of the first electrode sheet.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a strip feeding detection method, device, laminator, equipment and medium for a laminator.

Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important part of the sustainable development of the automotive industry. For electric vehicles, battery technology is also an important factor for their development.

[0003] In the manufacturing process of power batteries, lamination is an important process. Lamination means stacking continuous belt-shaped electrode sheets into a multi-layer rectangular parallelepiped shape, and mainly includes the free lamination method and the continuous lamination method. In the strip feeding process of the continuous lamination method, it is necessary to efficiently determine the deviation amount of the notch hole of the strip and the composite position of the composite electrode sheet.

Summary of the Invention

Problems to be Solved by the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this application is to provide a strip feeding detection method, device, laminator, device, and medium for a laminator to improve the efficiency of determining the deviation amount of the notch hole of the strip and the composite position of the composite electrode sheet.

Means for Solving the Problems

[0005] An embodiment of the first aspect of the present application provides a strip feeding detection method for a laminating machine, wherein the strip includes a plurality of first electrode sheets continuously distributed in the feeding direction, and the strip feeding detection method includes taking a photograph with at least one imaging device to obtain at least one strip image, determining whether the strip image includes a first mark, and, in response to the determination that the strip image includes a first mark, obtaining a target displacement amount of the first mark relative to a predetermined position based on the strip image.

[0006] In the present embodiment of the invention, a strip image is captured by an imaging device, a first mark is identified based on the strip image, and the target displacement amount of the first mark is obtained. Compared to detection by sensors, computer vision can improve the accuracy of notch hole detection, and furthermore, it can determine the complete first electrode sheet based on the first mark, ensure the acquisition of a complete strip image, and determine the feed displacement amount based on the first mark.

[0007] In some embodiments, the strip image includes a detection region between at least two adjacent first electrode sheets. Thus, detection efficiency can be further improved by first determining the detection region in the strip image and then confirming whether the detection region contains both a first and a second mark.

[0008] In some embodiments, the first mark is a through-hole provided within the detection area, and the strip feeding method for the stacking machine further includes illuminating a positive light source, from which emitted light is projected onto the front of the detection area, and / or illuminating a back light source, from which emitted light is projected onto the back of the detection area, before capturing with at least one imaging device, and determining whether the strip image includes a second mark, which is a predetermined figure formed on the front of the detection area. By arranging the positive and negative light sources simultaneously in this way, the imaging device can collect a strip image that simultaneously includes the first and second marks, thereby achieving simultaneous detection of the second and first marks. At the same time, the detection accuracy of the first mark is improved by further improving the clarity of the image of the first mark in the strip image.

[0009] In some embodiments, the first mark includes a first notch and a second notch located on opposite sides of the strip in a direction perpendicular to the feeding direction, the detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, the first notch is located within the first detection region, and the second notch is located within the second detection region, at least one imaging device includes a first imaging device and a second imaging device, the strip image includes a first detection image obtained by imaging the front of the first detection region with the first imaging device and a second detection image obtained by imaging the front of the second detection region with the second imaging device, wherein obtaining a target displacement amount of the first mark relative to a predetermined position based on the strip image includes obtaining a target displacement amount based on the first detection image and / or the second detection image in response to a determination that the first mark is included in the first detection region and the second detection region.

[0010] In this way, by installing the first and second imaging devices on opposite sides of the strip feeding direction, the first and second detection images can be collected at opposing positions on both sides of the strip feeding direction, and the target displacement amount can be obtained by simultaneously analyzing the two detection images, thereby improving the accuracy of the displacement amount calculation.

[0011] In some embodiments, obtaining a target displacement based on a first detection image and / or a second detection image includes obtaining a first displacement of a first notch hole relative to a predetermined position based on the first detection image, obtaining a first displacement of a second notch hole relative to a predetermined position based on the second detection image, and obtaining a target displacement based on the first and second displacement amounts.

[0012] In this way, by installing the first and second imaging devices on both sides of the strip feeding direction, the first and second detection images can be collected at opposing positions on both sides of the strip feeding direction. Based on the two detection images, the amount of displacement of the two notches at opposing positions on the strip can be obtained, the calculation result of the displacement can be calibrated, the target displacement can be obtained, and the accuracy of calculating the target displacement can be improved.

[0013] In some embodiments, obtaining a target displacement based on a first displacement and a second displacement includes obtaining a target displacement based on a first displacement and a second displacement in response to the absolute value of the difference between the first displacement and the second displacement being less than or equal to a predetermined threshold. During the calibration process, if the error between the first displacement and the second displacement obtained from two detection images, respectively, is within a predetermined range, a target displacement (for example, by taking the average of the first displacement and the second displacement) can be obtained based on the first displacement and the second displacement, thereby improving the accuracy of displacement calculation.

[0014] In some embodiments, the strip feeding detection method for a stacking machine further includes outputting reminder information in response to the absolute value of the difference between a first displacement and a second displacement being greater than a predetermined threshold. During the calibration process, if the error between the first displacement and the second displacement obtained from two detection images exceeds a predetermined range, alarm information is immediately transmitted. This allows for timely alarm information to be issued for adjustment when there is a clear error in the displacement results obtained from two imaging devices, improving the speed of problem detection and the efficiency of information feedback.

[0015] In some embodiments, the strip feeding detection method for a laminating machine further includes outputting reminder information in response to a determination that a first mark is not included in at least one of a first detection area and a second detection area. If notches are not detected simultaneously in both images from the two detection images, an alarm is sent to enable timely processing of problematic electrode sheet strips, improving the speed of problematic strip detection and the efficiency of information feedback.

[0016] In some embodiments, the detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, and the second mark includes a first marking portion located within the first detection region and a second marking portion located within the second detection region, wherein determining whether a strip image includes the second mark includes detecting whether the first marking portion is included in the first detection image, detecting whether the second marking portion is included in the second detection image, and determining whether the second mark is included on the front of the detection region based on the detection result for the first marking portion in the first detection image and the detection result for the second marking portion in the second detection image.

[0017] In this way, by installing the first and second imaging devices on both sides of the strip feeding direction, the first and second detection images can be collected at opposing positions on both sides of the strip feeding direction, respectively. Based on the two detection images, the detection results of the marking portions at opposing positions on both sides of the strip can be obtained, thereby obtaining the final detection result of the second mark and improving the accuracy of the detection result of the second mark.

[0018] In some embodiments, determining whether a second mark is included on the front of the detection area includes determining that the first detection image includes a first marking and the second detection image includes a second marking, and confirming that a second mark is included on the front of the detection area. This allows obtaining detection results for markings at opposing positions on both sides of the strip based on the two detection images, and by comparing the two detection results to perform cross-verification, obtaining the final detection result for the second mark, and determining the composite position of the composite electrode sheet, the accuracy of the detection results and the determination of the composite position can be improved.

[0019] In some embodiments, the strip feeding detection method for a laminating machine further includes outputting reminder information in response to a determination that a second mark is not included in either the first or second detection area. This allows for obtaining detection results for the markings at opposing positions on both sides of the strip based on the two detection images, and cross-verification of the detection results by comparing the two results. If the two detection results do not match, an alarm can be triggered in a timely manner to make adjustments, improving the speed of problem detection and the efficiency of information feedback.

[0020] In some embodiments, the strip feeding detection method for a laminating machine further includes, in response to a determination that neither the first detection image nor the second detection image contains the second mark, confirming that the second mark is present on the back of the detection area. This makes it possible to simultaneously detect the second mark on both the front and back of the electrode sheet strip by providing an imaging device only on the front, without providing an imaging device on the back of the electrode sheet strip, thereby simplifying the equipment structure and reducing equipment costs.

[0021] In some embodiments, at least one imaging device includes two sets of imaging devices installed at a predetermined distance apart, and imaging the detection area between two adjacent first electrode sheets with at least one imaging device includes imaging the front of the detection area between the two adjacent first electrode sheets with one set of imaging devices and imaging the back of the detection area between the two adjacent first electrode sheets with another set of imaging devices. By providing two sets of imaging devices separated on the front and back of the strip, it is possible to simultaneously detect the second marks on both the front and back surfaces of the strip, and to further improve the detection results of the second marks and the accuracy of determining the composite position.

[0022] In some embodiments, the target displacement includes the displacement of the first mark relative to a predetermined position in the feeding direction. By determining a predetermined position whose relative position to the cutting mechanism is fixed in this way, the displacement of the strip relative to the cutting mechanism can be accurately and easily calculated based on the distance between the predetermined position and the first mark.

[0023] In some embodiments, the position of at least one imaging device is fixed, and the predetermined position is the optical center of the corresponding imaging device. By fixing the position of the imaging device, i.e., fixing the relative distance between the imaging device and the cutting mechanism, the amount of strip displacement can be calculated simply by obtaining the relative distance of the first mark to the optical center of the imaging device, saving resources for calculating the amount of strip displacement and improving the efficiency of calculating the amount of strip displacement.

[0024] An embodiment of the second aspect of the present application provides a strip feeding detection device for a laminator. The strip includes a plurality of first electrode sheets continuously distributed in the feeding direction. The strip feeding detection device includes at least one imaging device arranged to capture the strip to obtain at least one strip image, and an image processing device arranged to determine whether the strip image includes a first mark and, in response to a determination that the strip image includes the first mark, determine a target deviation amount of the first mark with respect to a predetermined position based on the strip image.

[0025] In the technical solution of the embodiment of the present application, the imaging device captures a strip image, identifies a first mark based on the strip image, and obtains a target deviation amount of the first mark. Compared with the detection by a sensor, computer vision can improve the detection accuracy of notch holes, further determine a complete first electrode sheet based on the first mark, ensure the acquisition of a complete strip image, and determine a feeding deviation amount based on the first mark.

[0026] In some embodiments, the image processing device includes a first determination unit arranged to determine whether the strip image includes a first mark, and an acquisition unit arranged to obtain a target deviation amount of the first mark with respect to a predetermined position based on the strip image in response to a determination that the strip image includes the first mark.

[0027] In some embodiments, the target deviation amount includes a deviation amount of the first mark with respect to a predetermined position in the feeding direction. In this way, by determining a predetermined position where the relative position with the cutting mechanism is fixed, the deviation amount of the strip with respect to the cutting mechanism can be accurately and easily calculated based on the distance between the predetermined position and the first mark.

[0028] In some embodiments, the strip image includes a detection region between at least two adjacent first electrode sheets.

[0029] In some embodiments, the first mark is a through hole provided in the detection area, and the strip feeding device for the laminator further includes a front light source and a back light source, and a first controller arranged to turn on the front light source whose emitted light is projected onto the front of the detection area and / or turn on the back light source whose emitted light is projected onto the back of the detection area before being photographed by at least one photographing device. The first determination unit is further arranged to determine whether the strip image includes a second mark which is a predetermined figure formed on the front of the detection area. In this way, by arranging the front light source and the back light source simultaneously, the photographing device can collect a strip image including the first mark and the second mark simultaneously, and realize the simultaneous detection of the second mark and the first mark. At the same time, by further improving the sharpness of the image of the first mark in the strip image, the accuracy of the first mark detection is improved.

[0030] In some embodiments, the first mark includes a first notch hole and a second notch hole located on opposite sides of the strip in a direction perpendicular to the feeding direction. The detection area includes a first detection area and a second detection area located between two adjacent first electrode sheets. The first notch hole is located within the first detection area, and the second notch hole is located within the second detection area. The at least one photographing device includes a first photographing device and a second photographing device. The strip image includes a first detection image obtained by photographing the front of the first detection area with the first photographing device and a second detection image obtained by photographing the front of the second detection area with the second photographing device. Here, the acquisition unit is arranged to acquire a target deviation amount based on the first detection image and / or the second detection image in response to the determination that the first mark is included in the first detection area and the second detection area.

[0031] In this way, by installing the first and second imaging devices on opposite sides of the strip feeding direction, the first and second detection images can be collected at opposing positions on both sides of the strip feeding direction, and the target displacement amount can be obtained by simultaneously analyzing the two detection images, thereby improving the accuracy of the displacement amount calculation.

[0032] In some embodiments, the acquisition unit is configured to acquire a first displacement of a first notch hole relative to a predetermined position based on a first detection image, a first displacement of the second notch hole relative to a predetermined position based on a second detection image, and a target displacement based on the first and second displacement amounts.

[0033] In this way, by installing the first and second imaging devices on both sides of the strip feeding direction, the first and second detection images can be collected at opposing positions on both sides of the strip feeding direction, the amount of displacement of the two notches at opposing positions on the strip can be obtained based on the two detection images, the calculation result of the displacement amount can be calibrated, the target displacement amount can be obtained, and the accuracy of calculating the target displacement amount can be improved.

[0034] In some embodiments, the acquisition unit is further configured to acquire a target displacement amount based on the first and second displacement amounts in response to a determination that the absolute value of the difference between the first and second displacement amounts is less than or equal to a predetermined threshold. During the calibration process, if the error between the first and second displacement amounts acquired from the two detection images is within a predetermined range, a target displacement amount (e.g., the average of the first and second displacement amounts) can be acquired based on the first and second displacement amounts, thereby improving the accuracy of the displacement amount calculation.

[0035] In some embodiments, the strip feeding detection device for a stacking machine further comprises a first output unit, and a first controller is further configured to control the first output unit to output reminder information in response to the absolute value of the difference between a first displacement and a second displacement being greater than a predetermined threshold. During the calibration process, if the error between the first displacement and the second displacement obtained from two detection images exceeds a predetermined range, alarm information is immediately transmitted. This allows for timely alarm information to be sent for adjustment when there is a clear error in the displacement results obtained from the two imaging devices, improving the speed of problem detection and the efficiency of information feedback.

[0036] In some embodiments, the first controller is further configured to control a first output unit to output reminder information in response to a determination that the first mark is not included in at least one of the first detection area and the second detection area. If notches are not detected simultaneously in both images from the two detection images, an alarm is sent to allow for timely processing of problematic electrode sheet strips, improving the speed of problem strip detection and the efficiency of information feedback.

[0037] In some embodiments, the detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, and the second mark includes a first marking portion located within the first detection region and a second marking portion located within the second detection region, wherein the first confirmation unit is configured to detect whether the first detection image includes the first marking portion, whether the second detection image includes the second marking portion, and to determine whether the second mark is included on the front of the detection region based on the detection result for the first marking portion in the first detection image and the detection result for the second marking portion in the second detection image.

[0038] In this way, by installing the first and second imaging devices on both sides of the strip feeding direction, the first and second detection images are collected at opposing positions on both sides of the strip feeding direction, respectively. Based on the two detection images, the detection results of the marking portions at opposing positions on both sides of the strip are obtained, thereby obtaining the final detection result of the second mark and improving the accuracy of the detection result of the second mark.

[0039] In some embodiments, the first confirmation unit is positioned to respond to a determination that the first detection image includes a first marking and the second detection image includes a second marking, thereby confirming that a second mark is present on the front of the detection area. This allows for the acquisition of detection results for markings at opposing positions on both sides of the strip based on the two detection images, mutual verification of the two detection results by comparing them, obtaining the final detection result for the second mark, and determining the composite position of the composite electrode sheet, thereby improving the accuracy of the detection results and the determination of the composite position.

[0040] In some embodiments, the strip feeding detection device for a laminating machine further comprises a second output unit, and the first controller is further configured to control the second output unit to output reminder information in response to a determination that the second mark is not included in either the first or second detection image. This allows for the acquisition of detection results for the markings at opposing positions on both sides of the strip based on the two detection images, and the two detection results to be compared and cross-verified. If the two detection results do not match, an alarm can be triggered in a timely manner to make adjustments, improving the speed of problem detection and the efficiency of information feedback.

[0041] In some embodiments, the strip feeding detection device for a laminating machine further comprises a second confirmation unit positioned to confirm that the second mark is present on the back of the detection area, in response to a determination that the second mark is not present in both the first and second detection images. This improves the accuracy of detection results and composite position determination by obtaining detection results for markings at opposing positions on both sides of the strip based on the two detection images, comparing the two detection results to perform cross-verification of the detection results, obtaining the final detection result for the second mark, and determining the composite position of the composite electrode sheet.

[0042] In some embodiments, at least one imaging device includes two sets of imaging devices installed at a predetermined distance apart, one set of imaging devices positioned to photograph the front of the detection area between two adjacent first electrode sheets, and the other set of imaging devices positioned to photograph the back of the detection area between two adjacent first electrode sheets. By providing two sets of imaging devices separated on the front and back of the strip, it is possible to simultaneously detect second marks on both the front and back surfaces of the strip, further improving the accuracy of the detection results of the second marks and the determination of their combined positions.

[0043] In some embodiments, the position of at least one imaging device is fixed, and the predetermined position is the optical center of the imaging device. By fixing the position of the imaging device, i.e., fixing the relative distance between the imaging device and the cutting mechanism, it becomes unnecessary to perform complex operations such as camera calibration, and the amount of strip displacement can be calculated solely by the relative distance of the first mark in the image to the optical center of the imaging device. This saves resources for calculating the strip and improves the efficiency of calculating the amount of strip displacement.

[0044] In some embodiments, the positive light source includes a first positive light source and a second positive light source, which are positioned on opposite sides of the strip in a direction perpendicular to the feed direction, with the light emitted from the first positive light source projected onto the front of a first detection area and the light emitted from the second positive light source projected onto the front of a second detection area. By installing a pair of positive light sources to illuminate opposite positions on both sides of the strip, the second marks captured by the two imaging devices become clearer, improving the identification effect. At the same time, compared to installing a single positive light source to illuminate the entire strip, installing a pair of positive light sources allows for adaptation to strips of different widths and saves more energy.

[0045] In some embodiments, the positive light source is positioned such that the angle between the light emitted by the positive light source and the plane on which the strip is located is 45° to 75°. Setting the positive light source to an appropriate illumination angle further improves the imaging effect of the second mark.

[0046] In some embodiments, the positive light source is positioned such that the angle between the light from the positive light source and the plane on which the strip is located is 45°. Setting the positive light source to form a 45° angle with the strip further optimizes the imaging effect of the second mark.

[0047] In some embodiments, the backlighting system includes a first backlighting system and a second backlighting system, which are positioned on opposite sides of the strip in a direction perpendicular to the feed direction, with light emitted from the first backlighting system projected onto the back of a first detection area and light emitted from the second backlighting system projected onto the back of a second detection area. By installing a pair of backlighting systems to illuminate the relative positions on both sides of the strip, two imaging devices can capture a first mark on the edge of the strip. At the same time, installing a pair of backlighting systems allows for adaptation to strips of different widths and saves more energy compared to installing a single backlighting system to illuminate the entire strip.

[0048] In some embodiments, the background light source is a red light source. Because red light has the longest wavelength among visible light, it has high penetrating power and can obtain a better image effect for defective notches where foreign matter blocks the notch or the notch is not completely punched through.

[0049] In some embodiments, the strip feeding detection device for a stacking machine further comprises a prism cooperating with each imaging device, the optical axis of each imaging device being positioned parallel to the plane on which the strip is located, and each imaging device being able to image the detection area between the two first electrode sheets of the strip by means of the cooperating prism. The cooperation between the prism and the imaging device ensures that the imaging device captures a clear image while also saving installation space.

[0050] An embodiment of a third aspect of the present application provides a laminating machine comprising: a transport mechanism arranged for transporting strips; a strip feeding detection device as described in the second aspect; a cutting mechanism; and a second controller arranged to control the strip feeding detection device to calibrate the feeding deviation with respect to the strips transported by the transport mechanism, and to control the cutting mechanism to cut the strips in the transport mechanism after the feeding deviation has been calibrated.

[0051] Embodiments of a fourth aspect of the present application include at least one processor and a memory communicably connected to the at least one processor, the memory storing instructions executable by the at least one processor, the instructions providing an electrical installation to be executed by the at least one processor such that the at least one processor can perform the strip feed detection method described in the first aspect.

[0052] An embodiment of a fifth aspect of the present application provides a non-temporary computer-readable storage medium storing computer instructions, which a computer uses to perform the strip feeding detection method described in the first aspect.

[0053] A sixth embodiment of the present application provides a computer program product including a computer program, which, when executed by a processor, implements the strip feeding detection method described in the first embodiment.

[0054] The above description is merely an overview of the technical proposal of this application. In order to further clarify the technical means of this application that can be implemented in accordance with the specification, and to make the above-mentioned and other objectives, features and advantages of this application clearer and easier to understand, specific embodiments of this application are given below. [Brief explanation of the drawing]

[0055] In the drawings, unless otherwise specified, the same reference numeral in multiple drawings indicates the same or similar part or element. These drawings are not necessarily drawn to scale. These drawings depict only some of the embodiments disclosed herein and should not be considered to limit the scope of the application.

[0056] [Figure 1] This is a schematic diagram of the structure of the negative electrode strip before the positive electrode sheet is combined with the positive electrode sheet of some embodiments of the present application. [Figure 2] This is a schematic diagram of the structure of a negative electrode strip after combining positive electrode sheets of several embodiments of the present application. [Figure 3] This is a cross-sectional view of the strip in Figure 2, along the feeding direction. [Figure 4] This is a block diagram of a flowchart of a strip feeding detection method for a laminating machine according to several embodiments of the present invention. [Figure 5] This is a schematic diagram of strip images collected by the imaging apparatus of several embodiments of the present application. [Figure 6] This is a flowchart block diagram of a method for detecting a first mark and a second mark in a strip image using an image processing algorithm of some embodiments of the present application. [Figure 7]This is a block diagram of a flowchart illustrating a method for calculating the target displacement amount based on the position of a first mark in several embodiments of the present application. [Figure 8] This is a schematic diagram of the detection region between two adjacent electrode sheets in some embodiments of the present application. [Figure 9] This is a block diagram of a flowchart illustrating a method for obtaining a target displacement amount based on a first detection image and / or a second detection image in some embodiments of the present application. [Figure 10] This is a flowchart block diagram of a method for determining whether or not a strip image of several embodiments of the present application contains a second mark. [Figure 11] This is a block diagram of a flowchart of a strip feeding detection method for a laminating machine according to several embodiments of the present invention. [Figure 12] This is a structural block diagram of a strip feeding detection device for a laminating machine according to several embodiments of the present invention. [Figure 13] This is a schematic diagram of the local structure of a strip feeding detection device along the feeding direction in some embodiments of the present application. [Figure 14] This is a schematic diagram of the local structure of a strip feeding detection device along a direction perpendicular to the feeding direction in some embodiments of the present application. [Figure 15] This is a schematic diagram of the structure of a strip feeding detection device according to several embodiments of the present application. [Figure 16] This is a schematic diagram of the local structure of a strip feeding detection device along the feeding direction in some embodiments of the present application. [Figure 17] This is a schematic diagram of the local structure of a strip feeding detection device along a direction perpendicular to the feeding direction in some embodiments of the present application. [Figure 18] This is a schematic diagram of the structure of a strip feeding detection device for a laminating machine according to several embodiments of the present invention. [Modes for carrying out the invention]

[0057] The embodiments of the present invention will be described in detail below with reference to the drawings. The following embodiments are merely illustrative and intended to provide a clearer explanation of the present invention; they should not limit the scope of protection of the present invention.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art. Terms used herein are solely 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 description, claims, and brief description of the drawings herein, are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of this application, the technical terms "first," "second," etc., are used merely to distinguish different subjects and should not be understood as indicating relative importance or implying the number, specific order, or hierarchical relationship of technical features. In the description of the embodiments of this application, "plural" means two or more unless otherwise specified.

[0060] As used herein, “Examples” means that a combination of specific features, structures, or properties described in the Examples may be included in at least one Example of the Application. The term as it appears throughout this Specification does not necessarily refer to the same Example, nor does it mean that each Example is mutually exclusive, independent, or substitutable for another Example. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described herein may be combined with other Examples.

[0061] In the description of the embodiments of this application, the term "and / or" merely describes the relationship between the related objects, meaning that there can be three possible relationships. For example, "A and / or B" could refer to just A, both A and B, or just B. In addition, the " / " in the text generally indicates that the preceding and following related objects have an "or" relationship.

[0062] In the description of the embodiments of this application, the term "multiple" means two or more (including two), similarly, "multiple sets" means two or more sets (including two sets), and "multiple sheets" means two or more sheets (including two sheets).

[0063] In the description of the embodiments of this application, the orientations and positional relationships indicated by technical terms such as "center," "vertical direction," "horizontal direction," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial direction," "radial direction," "circumferential direction," "front," and "back" are based on the orientations and positional relationships in the drawings and are merely for the purpose of facilitating and simplifying the description of the embodiments of this application. They do not indicate or imply that the devices or elements shown must have a specific orientation or must be configured and operate in a specific orientation, and therefore should not be interpreted as limiting the embodiments of this application.

[0064] In the description of the embodiments of this application, unless otherwise specified or limited, technical terms such as "attached," "connected," "connected," and "fixed" should be understood in a broad sense. For example, this could be a fixed connection, a removable connection, or integration; it could be a mechanical connection or an electrical connection; it could be a direct connection or an indirect connection via an intermediate medium; or it could be an internal communication between two elements or an interaction relationship between two elements. A person skilled in the art will be able to understand the specific meaning of these terms described in the embodiments of this application depending on the specific situation.

[0065] Currently, given the development of the market, the applications of power batteries are expanding more and more. Power batteries are widely used not only in energy storage and power generation systems such as hydroelectric power plants, thermal power plants, wind power plants, and solar power plants, but also in electric mobility tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application fields of power batteries continue to expand, their market demand is also growing.

[0066] Currently, lamination is a crucial step in the manufacturing process of power batteries. Lamination involves stacking continuous belt-shaped electrode sheets into a multi-layered rectangular parallelepiped, primarily using the free lamination method and the continuous lamination method. In the continuous lamination method, a strip (e.g., a negative electrode strip) is drawn from a roll by an unwinding device, and then transported by a conveying mechanism to a cutting mechanism to cut it into an electrode sheet strip having multiple continuous electrode sheets. Next, a separator is compounded onto each electrode sheet strip, and electrode sheets (e.g., positive electrode sheets) are compounded onto the corresponding positions on the front and back of the electrode sheet strip with the separators, and then folded in a "Z" shape to form a cell. In the strip feeding process, to align the cutting position on the strip with the cutting mechanism and complete the cutting of the strip, a sensor first identifies the notch between two electrode sheets in the strip, and then calibrates the deviation in the feeding direction relative to the strip based on the notch identification result. Furthermore, before assembling the electrode sheet onto the electrode sheet strip having a separator, it is necessary to detect the markings on the electrode sheet strip (for example, the folds on the electrode sheet side of the strip) to determine the assembling position.

[0067] The inventors of this invention have found that in related technologies, the detection accuracy of notched holes is low, and problems such as false detection and detection omissions are likely to occur.

[0068] In view of the above problems, the inventor provides a strip feeding detection method for a laminating machine. In the technical solution of the present invention, a strip image is captured by an imaging device, a first mark is identified based on the strip image, and the target displacement amount of the first mark is obtained. Compared to detection by sensors, computer vision can improve the accuracy of notch hole detection, and furthermore, a complete first electrode sheet can be determined based on the first mark, ensuring the acquisition of a complete strip image, and the feeding displacement amount can be determined based on the first mark. The accuracy of strip cutting can be improved by using the technical solution of the present invention.

[0069] The first mark may, for example, be a notch, but is not limited to that.

[0070] The strip feeding detection method and apparatus for a laminating machine according to this embodiment can be applied to the manufacturing stage of laminated cells in the manufacture of power batteries. Specifically, it can be applied to the manufacturing process of laminated cells using the continuous lamination method.

[0071] In the manufacturing of laminated cells, strips are first obtained wound on rolls after processes such as dosing, coating, rolling, and slitting. These strips are then unwound from the rolls through an unwinding device and transported to the next process. The strips may be either negative electrode strips or positive electrode strips; the subsequent processes will be explained below using negative electrode strips as an example.

[0072] Figures 1 and 2 show schematic diagrams of the strip structure of the negative electrode strip before and after the addition of the positive electrode sheet, respectively, while Figure 3 shows a schematic diagram of the distribution of the negative electrode continuous laminated strip and electrode sheet. Note that the separator between the negative electrode strip and the positive electrode sheet is not shown in Figure 2.

[0073] As shown in Figure 1, the negative electrode strip 100 is transported by an unwinding device along the feeding direction 104. The negative electrode strip 100 includes a plurality of continuous negative electrode sheets 101, with notches 102 distributed at opposing positions on both sides of the negative electrode strip 100 edge between each pair of negative electrode sheets 101, and the line of notches 102 is perpendicular to the feeding direction 104. Marking portions 103 are present along the line of notches 102 between two adjacent negative electrode sheets 101, and both the front and back surfaces of the negative electrode strip 100 have marking portions 103.

[0074] The notch 102 is used to indicate the complete negative electrode sheet 101 on the negative electrode strip 100. Typically, the notch 102 is an elongated rectangular notch. To understand this, the notch 102 may be any other shape, and is not limited here. The position of the negative electrode sheet 101 on the negative electrode strip 100 is obtained by identifying the notch 102 with a detection device such as a sensor (e.g., a photosensitive sensor) or an imaging device.

[0075] The marking portion 103 is used to indicate the combined position of the positive electrode sheet 201 on the negative electrode strip 100. Referring to Figures 1 and 2, the marking portion 103 may be a fold, and the fold may be identified by identifying the color difference between the marking portion and the surrounding area using visual inspection techniques. The marking portions 103 are spaced apart on the front or back of the negative electrode strip 100, and adjacent marking portions 103 are located on the front and back of the negative electrode strip 100, respectively. Specifically, as shown in Figures 1 and 2, in response to the identification of a marking portion 103 on the front of the negative electrode strip 100, the positive electrode sheet 201 is compounded into the negative electrode sheet region behind the marking portion 103 on the front of the negative electrode strip 100 (in the direction opposite to the feeding direction 104). In response to the absence of a marking portion at the detection position 105 on the front of the negative electrode strip 100 (i.e., the marking portion in the detection area is on the back of the negative electrode strip 100), the positive electrode sheet 201 is compounded into the negative electrode sheet region behind the detection position 105 on the opposite side of the negative electrode strip 100 (in the direction opposite to the feeding direction 104).

[0076] Here, the application of spatially relative terms such as "front" and "back" in this specification is intended to describe the relative positional relationship between the negative electrode strip and the detection area shown in the drawings. To make it clear, these spatially relative terms are intended to encompass different orientations of the image during use or operation, in addition to the orientation shown in the drawings. For example, if the strip in the drawings is turned over, what is labeled "front" becomes "back." Similarly, the strip may be oriented in other orientations (e.g., by inverting the strip so that the strip plane is perpendicular to the ground, or by rotating it in another orientation), and the spatially relative terms used herein shall be interpreted accordingly.

[0077] In practice, as shown in Figure 3, a separator 202 made of an insulating material is also required between the negative electrode strip and the positive electrode sheet 201. The separator 202 is added before the positive electrode sheet 201 is added and cut. Because the separator 202 has poor light transmittance, the detection effect of the notch 102 and the marking portion 103 is significantly reduced after the separator 202 is added. Therefore, it is necessary to detect both before the separator is added, store the relevant information in a controller (e.g., a programmable controller), and control the addition of the positive electrode sheet and the cutting of the strip based on this relevant information.

[0078] The negative electrode strip 100 is transported by an unwinding device to a cutting mechanism, where it is cut into an electrode sheet strip having a plurality of continuous negative electrode sheets 101. Each electrode sheet strip is then transported to a coating device where a separator 202 is compounded. The transport mechanism then transports it further to a positive electrode sheet compounding device, where the positive electrode sheets 201 are compounded on the front and back of the negative electrode strip at intervals. Finally, the strip is transported to another cutting mechanism, where it is cut into a plurality of complete cell strips. One complete cell strip is obtained when, as shown in the cell strip 300 in Figure 3, the tail sheet of the cell strip preceding the cell strip 300 is identified, and a cut is made at the cutting position 301. The controller then uses the relevant information of the stored notches to advance the strip a predetermined distance along the feeding direction 104, aligning the cutting position 302 (i.e., the end position of the tail sheet 303 of the cell strip 300) with the cutter of the cutting mechanism, and cutting the strip to obtain the complete cell strip 300. Next, the cell strip 300 is folded in a "Z" shape to obtain the stacked cells.

[0079] To accurately align the cutting position of the electrode sheet strip with the cutter, the deviation in the feeding direction must be calibrated by a notch corresponding to that position. By applying the strip feeding detection method and apparatus for laminating machines of the present invention, it is possible to detect the amount of notch hole misalignment, reduce problems of false detection and detection omissions, and improve detection accuracy.

[0080] To achieve accurate detection of notch hole misalignment, this invention provides a strip feeding detection method for a laminating machine.

[0081] Referring to Figure 4, some embodiments of the present application provide a strip feeding detection method 400 for a laminating machine, wherein the strip comprises a plurality of first electrode sheets continuously distributed in the feeding direction, and the method 400 comprises the following steps:

[0082] Step S401: Take a picture with at least one imaging device and obtain at least one strip image.

[0083] Step S402: Determine whether the strip image contains the first mark.

[0084] Step S403: In response to the determination that the strip image contains the first mark, the target displacement amount of the first mark relative to a predetermined position is obtained based on the strip image.

[0085] In some embodiments, conventional sensors (e.g., photosensitive sensors) are unable to detect the markings. Therefore, in the method 400 of the present invention, the strip is photographed with an imaging device to obtain a strip image, and the first mark is detected based on the strip image.

[0086] In some embodiments, the imaging device may be an industrial camera or a machine vision camera, and preferably, a high-frame-rate area array CCD industrial camera may be used to obtain a clear strip image.

[0087] In some embodiments, the strip may be a negative electrode strip or a positive electrode strip and includes a plurality of first electrode sheets that are continuous in the feeding direction. Taking a negative electrode strip as an example, each first electrode sheet is a negative electrode sheet.

[0088] In some embodiments, two adjacent first electrode sheets are distinguished by a first mark (e.g., a notch).

[0089] In some embodiments, a conventional sensor (e.g., a photosensitive sensor) may be used to detect the notch, and in response to the detection of the notch, the imaging device may be activated to capture a strip image. In some cases, abnormal situations may exist, such as the absence of a notch, an incomplete notch, or a notch being blocked by foreign matter, and the sensor may not be able to detect the notch. In response to the fact that the next image has not been triggered even after the strip has traveled a distance exceeding the width of one electrode sheet, the imaging device may be configured to activate directly to take an image.

[0090] Figure 5 is a schematic diagram of a strip image collected by the imaging device. The strip image 500 shown in Figure 5 includes an electrode sheet region 510 and a non-electrode sheet region 520. The electrode sheet region 510 includes an electrode sheet edge 511 and a notch 512 (i.e., a first mark). In some embodiments, an image processing algorithm may be used to detect the notch 512 in the strip image 500.

[0091] In some embodiments, as shown in Figure 6, a method 600 for detecting a first mark in a strip image by an image processing algorithm includes the following steps:

[0092] Step S601: Determine the electrode sheet area.

[0093] Referring to Figure 5, the non-electrode sheet region 520 is the region of the image captured by the imaging device that does not belong to the electrode sheet region 510, excluding the electrode sheet edge 511. In some cases, the non-electrode sheet region 520 may be the captured white backlight region. In this case, the non-electrode sheet region 520 has a stable grayscale value of 255, while the grayscale value of the electrode sheet region 510 is usually in the range of 40 to 50. Therefore, by comparing the difference in grayscale between the two regions, the electrode sheet edge 511 can be determined, and further, the electrode sheet region 510 can be determined.

[0094] In some cases, if the electrode sheet area cannot be successfully determined by the above method, alarm information may be sent to the control system (e.g., a programmable controller for controlling the production line) so that technicians can handle abnormal situations in a timely manner.

[0095] Step S602: In response to determining the electrode sheet area, the area of ​​the notch (i.e., the first mark) is determined.

[0096] Referring to Figure 5, after determining the electrode sheet region 510, the region range of the notch 512 may be extracted by the grayscale difference between the notch 512 and the electrode sheet region 510. In some cases, the grayscale value of the notch 512 may be 250 to 255, and the grayscale value of the electrode sheet region 510 is usually 40 to 50, so the region range of the notch 512 can be extracted by comparing the grayscale difference between the two regions.

[0097] In some embodiments, after extracting the region of the notch 512, it is necessary to determine whether the size of the region of the notch 512 satisfies a preset condition. If the preset condition is met, it is determined that a notch exists. If the condition is not met, it is determined that a notch does not exist. The preset condition may include, for example, at least one of the following: the pixel area of ​​the region of the notch 512 is greater than or equal to a predetermined area threshold, or the grayscale value of the region of the notch 512 is greater than or equal to a predetermined grayscale threshold. Here, since different types of strips have different notch hole sizes, the predetermined area threshold may be determined based on the type of strip being detected. Typically, the grayscale value of the notch 512 is between 250 and 255. Therefore, to determine whether the grayscale value of the notch satisfies the condition, the predetermined grayscale threshold may be set to, for example, 240.

[0098] If the grayscale value of a notch is smaller than a predetermined grayscale threshold, or if the region pixel area of ​​a notch is smaller than a predetermined area threshold, it can be determined that there is an abnormal situation, such as the notch not existing, being incomplete, or being blocked by foreign matter. In such cases, alarm information may be sent to the control system (e.g., a programmable controller for controlling the production line) so that technicians can deal with the abnormal situation in a timely manner.

[0099] In some embodiments, after determining that the detection area includes a notch, the target deviation may be further calculated based on the notch position to calibrate the deviation in strip feeding.

[0100] In some embodiments, as shown in Figure 7, a method for calculating the target displacement based on the position of a first mark (e.g., a notch) is presented, which includes the following steps.

[0101] Step S701: In response to determining the area of ​​the notch (i.e., the first mark), the first edge of the notch is determined.

[0102] Referring to Figure 5, in some embodiments, after determining the region of the notch 512, the first edge 514 of the notch 512 may be determined by searching for the pixel point with the largest grayscale value inversion in the neighborhood region of the first edge of the notch 512 based on an edge detection algorithm, and fitting these pixel points to a straight line using the least squares method. As can be seen, the first edge 514 may be, but is not limited to, the one of the two long edges of the notch 512 that is closer to the cutter or the one that is further away.

[0103] In some embodiments, after determining the region range of the notch 512, the notch detection region 515 may be determined first based on the region range, for example, by outlining the notch detection ROI (Region of Interest) so that it lies within the notch detection region 515, and then the first edge 514 of the notch 512 may be determined by an edge detection algorithm. This makes it possible to determine the first edge of the notch more efficiently and easily.

[0104] In some embodiments, if the first edge of the notch cannot be successfully determined by the method described above, an alarm message may be sent to a control system (e.g., a programmable controller for controlling the production line) so that an engineer can deal with the abnormal situation in a timely manner.

[0105] Step S702: Determine the target displacement amount based on the first edge and the predetermined position.

[0106] In some embodiments, since the relative positions of the imaging device and the cutter in the cutting mechanism are fixed, the target displacement of the notch can be obtained by calculating the displacement distance of the notch relative to the imaging device from the strip image. In some examples, the distance between the first edge of the notch and the predetermined position in the strip feeding direction, i.e., the target displacement, can be obtained by determining a predetermined position in the strip image and obtaining the image coordinates of the predetermined position and the first edge position. As can be seen, the predetermined position may be any position in the strip image determined by a person skilled in the art, and is not limited thereto.

[0107] In some examples, as shown in Figure 5, the predetermined position may be the image center point 530 of the strip image, and the target displacement amount 540 is the distance between the image center point 530 and the first edge 514 of the notch hole 512.

[0108] In some embodiments, the method may be implemented using vision detection software incorporated into a CCD vision detection system.

[0109] The target misalignment amount obtained by the above method can be stored in a control system (e.g., a programmable controller) that controls the production line of the stacked cells, thereby controlling the precise alignment of the cutting position of the strip with the cutter based on the target misalignment amount to complete the cutting of the strip.

[0110] A strip image is captured by an imaging device, a first mark is identified based on the strip image, and the target displacement amount of the first mark is obtained. Compared to detection by sensors, computer vision can improve the accuracy of notch hole detection, and furthermore, it can determine the complete first electrode sheet based on the first mark, ensure the acquisition of a complete strip image, and determine the feed displacement amount based on the first mark. By adopting the present invention, the accuracy of strip cutting can be improved.

[0111] In some embodiments, the strip image includes a detection region between at least two adjacent first electrode sheets. Referring to Figure 5, the detection region may be, for example, an electrode sheet region 510. In this way, detection efficiency can be further improved by first determining the detection region in the strip image and then determining whether the detection region contains the first and second marks.

[0112] According to some embodiments of the present application, the first mark is a through hole provided in the detection area, and the strip feeding detection method for a stacking machine further includes illuminating a positive light source from which emitted light is projected onto the front of the detection area and / or illuminating a back light source from which emitted light is projected onto the back of the detection area, and determining whether the strip image includes a second mark which is a predetermined figure formed on the front of the detection area.

[0113] Under natural light, the imaging effect may be poor for the first mark (e.g., a notch) and the second mark (e.g., a fold). For example, in the captured strip image, the grayscale difference between the electrode sheet area, the non-electrode sheet area, and between the first and second marks is small, making the boundaries unclear. To avoid this situation, the detection area of ​​the strip needs to be illuminated by a pair of positive and negative light sources.

[0114] In some cases, the notch may be a through hole, and in other cases, the notch may be a blind hole.

[0115] In some embodiments, a positive light source is used to illuminate the front area of ​​the detection region, thereby improving the imaging effect of the second mark.

[0116] In some embodiments, a backlight source is provided on the back of the detection area, and by projecting light onto the back of the detection area to illuminate the notched hole area and the non-electrode sheet area, the boundaries between the electrode sheet area, the non-electrode sheet area and the notched hole area can be made clearer.

[0117] In some embodiments, the strip image may simultaneously have a clear first mark and a second mark image, where the second mark may be a marking portion (e.g., a fold) having a predetermined shape formed on the first mark to indicate the composite position on the strip of a second electrode sheet (i.e., a composite electrode sheet with the opposite polarity to the first electrode sheet).

[0118] In some embodiments, in addition to determining the notch (i.e., the first mark) by the method described above, it is further determined whether or not the strip image includes a second mark. Specifically, the method involves determining the detection area of ​​the marking portion (i.e., the second mark) based on the area of ​​the notch, and determining whether or not the marking portion (i.e., the second mark) is included in the detection area.

[0119] Typically, the relative positions of the marking portion and the notch are fixed. For example, referring to Figure 5, since the marking portion 513 is on the same line as the notch 512, if the area range of the notch 512 is determined, the detection area of ​​the marking portion can be determined.

[0120] In some embodiments, the marking detection region 516 may be determined based on the area range of the notch 512. For example, the marking detection ROI (Region of Interest) may be bordered so that it is located within the marking detection region 516. The area of ​​the marking region 512 is extracted based on the difference in grayscale between the marking region 512 and the electrode sheet region 510 (for example, the grayscale of the marking region 512 is generally 20-25, and the grayscale of the electrode sheet region 510 is generally 40-50). The pixel area of ​​the marking region is calculated, and it is determined whether or not the marking region exists by determining whether or not this pixel area is larger than a predetermined pixel area.

[0121] In some cases, the predetermined pixel area may be 2000 pixels. If the pixel area of ​​the marking area is greater than 2000, it is determined that the marking area is included in the detection area, and therefore the composite electrode sheet should be composited on the surface where the detection area is located. Otherwise, it is determined that the marking area is not included in the detection area, and therefore the composite electrode sheet should be composited on the back surface where the detection area is located.

[0122] In this way, by simultaneously arranging a positive light source and an anti-light source, the imaging device can capture a strip image containing both the first and second marks, thereby achieving simultaneous detection of both the second and first marks. At the same time, the detection accuracy of the first mark is improved by further enhancing the clarity of the image of the first mark in the strip image.

[0123] According to some embodiments of the present application, a first mark includes a first notch and a second notch located on opposite sides of the strip in a direction perpendicular to the feeding direction, a detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, the first notch is located within the first detection region and the second notch is located within the second detection region, at least one imaging device includes a first imaging device and a second imaging device, and the strip image includes a first detection image obtained by imaging the front of the first detection region with the first imaging device and a second detection image obtained by imaging the front of the second detection region with the second imaging device, wherein obtaining a target displacement amount of the first mark relative to a predetermined position based on the strip image includes obtaining a target displacement amount based on the first detection image and / or the second detection image in response to a determination that the first mark is included in the first detection region and the second detection region.

[0124] In some embodiments, one imaging device is installed on each of the opposing sides of the strip in a direction perpendicular to the feeding direction, allowing for the detection of notches and markings in opposing detection areas on both sides of the strip, respectively.

[0125] Figure 8 shows a schematic diagram of opposing detection regions on both sides of the strip. Referring to Figure 8, the strip 800 is transported along the feeding direction 801. The first and second imaging devices can capture a first detection image 810 and a second detection image 820 for the first and second detection regions, respectively. Here, the first detection region includes a first notch 811 and a first marking portion 812 near one edge of the strip 800, and the second detection region includes a second notch 821 and a second marking portion 822 near the other edge of the strip 800.

[0126] In some embodiments, the corresponding detection results may be obtained by detecting the first notch 811 and the second notch 821 in the first detection image 810 and the second detection image 820, respectively, based on the notch detection method.

[0127] In some embodiments, if it is determined that both the first and second notches exist, the target displacement amount can be calculated using the displacement amount calculation method based on the first notch in the first detection image or the second notch in the second detection image.

[0128] In some embodiments, if it is determined that both the first and second notches exist, the target displacement can be calculated using the displacement calculation method based on the first notch in the first detection image and the second notch in the second detection image. In one example, the corresponding first and second displacements can be calculated, and the target displacement can be determined by calculating the average value of the two displacements.

[0129] In this way, by installing a first imaging device and a second imaging device on both sides of the strip feeding direction, the first detection image and the second detection image can be collected at opposing positions on both sides of the strip feeding direction, and the target displacement amount can be obtained by simultaneously analyzing the two detection images, thereby improving the accuracy of the displacement amount calculation.

[0130] According to some embodiments of the present application, as shown in Figure 9, obtaining the target displacement amount based on a first detection image and / or a second detection image may include the following steps:

[0131] Step S901: Based on the first detection image, obtain the first displacement amount of the first notch hole relative to a predetermined position.

[0132] Step S902: Based on the second detection image, the second displacement amount of the second notch hole relative to the predetermined position is obtained.

[0133] Then, in step S903, the target displacement is obtained based on the first displacement and the second displacement.

[0134] Referring to Figure 8, the first notch hole edge 815 of the first notch hole 811 can be obtained based on the method for calculating the displacement, and the first displacement can be determined based on the distance between the first notch hole edge 815 and the predetermined position in the feeding direction. Similarly, the second notch hole edge 825 can be obtained based on the second notch hole 821, and the second displacement can be determined based on the distance between the second notch hole edge 825 and the predetermined position in the feeding direction. As can be seen, the predetermined position may be any position in the detection image determined by a person skilled in the art, and is not limited thereto.

[0135] In some embodiments, the first predetermined position 813 corresponding to the first notch edge 815 may be the image center of the first detected image 810, and the first displacement amount 814 is the distance between the first predetermined position 813 and the first notch edge 815.

[0136] In some embodiments, the second predetermined position 823 corresponding to the second notch edge 825 may be the image center of the second detected image 820, and the second displacement amount 824 is the distance between the second predetermined position 823 and the second notch edge 825.

[0137] In some embodiments, the predetermined position may be the same, for example, it may correspond to a line between the optical center of the first imaging device and the optical center of the second imaging device.

[0138] In some embodiments, a first or second deviation amount may be selected as the target deviation amount to calibrate the deviation in strip feeding.

[0139] In some embodiments, the average of a first and a second deviation may be calculated to determine the target deviation in order to calibrate the deviation in strip feeding.

[0140] In this way, by installing the first and second imaging devices on both sides of the strip feeding direction, the first and second detection images can be collected at opposing positions on both sides of the strip feeding direction. Based on the two detection images, the amount of displacement of the two notches at opposing positions on the strip can be obtained, the calculation result of the displacement can be calibrated, the target displacement can be obtained, and the accuracy of calculating the target displacement can be improved.

[0141] According to some embodiments of the present application, obtaining a target displacement based on a first displacement and a second displacement includes obtaining a target displacement based on a first displacement and a second displacement in response to the absolute value of the difference between the first displacement and the second displacement being less than or equal to a predetermined threshold.

[0142] In some embodiments, the detection results may be cross-verified based on the first and second detection images. Specifically, after obtaining the first and second displacement amounts based on the method described above, the difference between them can be calculated. If the absolute value of the difference is less than or equal to a predetermined threshold (for example, the displacement amount present when the two imaging devices are mounted), it can be determined that the detection results of the two displacement amounts are in close agreement, and further, a target displacement amount can be calculated based on the first and second displacement amounts using the method described above.

[0143] During the calibration process, if the error between the first and second displacement amounts obtained from the two detection images is within a predetermined range, a target displacement amount (for example, the average value of the first and second displacement amounts) can be obtained based on the first and second displacement amounts, thereby improving the accuracy of displacement calculation.

[0144] According to some embodiments of the present invention, the strip feeding detection method for a laminating machine further includes outputting reminder information in response to the absolute value of the difference between a first deviation and a second deviation being greater than a predetermined threshold.

[0145] In some embodiments, if the absolute value of the difference between the first and second displacement amounts is greater than a predetermined threshold (which may be, for example, the displacement amount present when the two imaging devices are mounted), it may be determined that the detection results of the two displacement amounts do not match. In this case, there may be a problem with the equipment or strip, and therefore, an alarm information may be sent to the control system (for example, a programmable controller for controlling the production line) so that a technician can deal with the abnormal situation in a timely manner.

[0146] During the calibration process, if the error between the first and second displacement values ​​obtained from the two detection images exceeds a predetermined range, an alarm is immediately transmitted. This allows for timely alarms to be issued for adjustment when there is a clear error in the displacement values ​​obtained from the two imaging devices, improving the speed of problem detection and the efficiency of information feedback.

[0147] According to some embodiments of the present invention, the strip feeding detection method for a laminating machine further includes outputting reminder information in response to a determination that a first mark (e.g., a notch) is not included in at least one of a first detection area and a second detection area.

[0148] In some embodiments, if it is determined that at least one of the first and second notches is absent (for example, by determining that the pixel area of ​​the notch is smaller than a predetermined area threshold and / or that the grayscale value of the notch is smaller than a predetermined grayscale threshold), it can be determined that an abnormal condition exists in at least one of the first and second notches, such as the notch being absent, the notch being incomplete, or the notch being blocked by foreign matter. Alarm information may be sent to the control system (e.g., a programmable controller for controlling the production line) so that technicians can deal with the abnormal situation in a timely manner.

[0149] If notches are detected simultaneously in two detection images, an alarm is sent, allowing for timely processing of problematic electrode sheet strips and improving the speed of problem strip detection and the efficiency of information feedback.

[0150] According to some embodiments of the present application, the detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, and the second mark includes a first marking portion located within the first detection region and a second marking portion located within the second detection region. Here, determining whether or not the strip image includes the second mark, as shown in Figure 10, may include the following steps.

[0151] Step S1001: Detect whether or not the first detection image contains the first marking area.

[0152] Step S1002: Detect whether the second detection image contains the second marking area.

[0153] Then, in step S1003, based on the detection result for the first marking area in the first detection image and the detection result for the second marking area in the second detection image, it is determined whether or not the second mark is included on the front of the detection area.

[0154] In some embodiments, as shown in Figure 8, the detection results for the corresponding marking portions may be obtained by detecting the first marking portion 812 and the second marking portion 822 in the first detection region 810 and the second detection region 820, respectively, based on the marking portion detection method.

[0155] In some embodiments, the final detection result of the marking portion may be obtained by comparing the detection results of the first marking portion 812 and the second marking portion 822 and performing cross-verification of the detection results.

[0156] In this way, by arranging the first and second imaging devices on both sides of the strip feeding direction, the first and second detection images can be collected at opposing positions on both sides of the strip feeding direction, respectively. Based on the two detection images, the detection results of the marking areas at opposing positions on both sides of the strip can be obtained, and the final detection result of the marking areas can be obtained, thereby improving the accuracy of the detection results of the marking areas.

[0157] According to some embodiments of the present application, determining whether or not a second mark is included on the front of the detection area includes determining that a second mark is included on the front of the detection area in response to a determination that a first marking portion is included in the first detection image and a second marking portion is included in the second detection image.

[0158] In this way, by obtaining detection results for the marking areas at opposing positions on both sides of the strip based on two detection images, comparing the two detection results to perform cross-verification, obtaining the final detection result for the marking area, and determining the combined position of the composite electrode sheet, the accuracy of the detection results and the determination of the combined position can be improved.

[0159] According to some embodiments of the present invention, the strip feeding detection method for a laminating machine further includes outputting reminder information in response to a determination that one of the first detection image and the second detection image does not contain the second mark.

[0160] In some embodiments, if the detection results of the first marking section and the second marking section do not match, it can be determined that there may be a problem with the equipment or strip, and an alarm information can be sent to the control system (e.g., a programmable controller for controlling the production line) so that a technician can deal with the abnormal situation in a timely manner.

[0161] In this way, based on two detection images, detection results for the marking areas at opposing positions on both sides of the strip can be obtained, and the two detection results can be compared to perform cross-verification of the detection results. If the two detection results do not match, an alarm can be triggered in a timely manner to make adjustments, improving the speed of problem detection and the efficiency of information feedback.

[0162] According to some embodiments of the present invention, the strip feeding detection method for a laminating machine further includes, in response to a determination that neither the first detection image nor the second detection image contains the second mark, confirming that the second mark is present on the back of the detection area.

[0163] In some embodiments, if the detection results for the first marking area and the second marking area are the same (i.e., both detection areas either include the marking area or do not include the marking area), the detection result is deemed to have passed verification and can be used to indicate the combined position of the composite electrode sheet.

[0164] In some embodiments, since the composite electrode sheet needs to be composited at a corresponding position on the strip after the separator has been composited, the position of the marking portion and the composite position information of the electrode sheet may first be stored in the control system to indicate the position for subsequent electrode sheet composite.

[0165] This allows for simultaneous detection of markings on both the front and back of the electrode sheet strip by installing a camera only on the front, without needing to install one on the back. This simplifies the equipment structure and reduces equipment costs.

[0166] According to some embodiments of the present application, at least one imaging device includes two sets of imaging devices installed at a predetermined distance apart, and imaging the detection area between two adjacent first electrode sheets with at least one imaging device includes imaging the front of the detection area between the two adjacent first electrode sheets with one set of imaging devices and imaging the back of the detection area between the two adjacent first electrode sheets with the other set of imaging devices.

[0167] In some embodiments, an additional pair of imaging devices may be added for imaging the back surface of the electrode sheet strip. The pair of imaging devices for imaging the back surface of the strip may be positioned on opposite sides of the strip in a direction perpendicular to the feeding direction, thereby enabling the detection of markings in opposing detection areas on both sides of the back surface of the strip.

[0168] In some embodiments, the imaging device for photographing the front of the strip and the imaging device for photographing the back of the strip may be positioned at a predetermined distance apart. This ensures that the two sets of forward and backward light sources for illuminating the front and back of the strip do not interfere with each other, thereby ensuring the imaging quality of the detected image.

[0169] By placing two sets of imaging devices spaced apart on the front and back of the strip, simultaneous detection of markings on both the front and back surfaces of the strip can be achieved, further improving the accuracy of the detection results and the determination of the combined position of the markings.

[0170] According to some embodiments of the present application, the target displacement includes the displacement of a first mark relative to a predetermined position in the feeding direction.

[0171] In this way, by determining a predetermined position that is fixed relative to the cutting mechanism, the amount of displacement of the strip relative to the cutting mechanism can be accurately and easily calculated based on the distance between the predetermined position and the strip notch hole.

[0172] According to some embodiments of the present application, the position of at least one imaging device is fixed, and the predetermined position is the optical center of the corresponding imaging device.

[0173] The optical center of the imaging device is the center point of the camera in the imaging device, which corresponds to the center point of the image in the strip image.

[0174] In some embodiments, as shown in Figure 5, the distance between the image center point 530 of the strip image and the first edge 514 of the notch 512 may be calculated, and the distance between the notch 512 in the real world and the optical center of the imaging device may be obtained as the target displacement amount based on the proportional relationship between the image coordinate system and the real-world coordinate system.

[0175] By fixing the position of the imaging device, that is, by fixing the relative distance between the imaging device and the cutting mechanism, the strip displacement can be calculated simply by obtaining the relative distance of the notch hole to the optical center of the imaging device. This saves resources used to calculate the strip displacement and improves the efficiency of calculating the strip displacement.

[0176] According to some embodiments of the present invention, referring to Figure 11, the strip feeding detection method for a laminating machine may include the following steps.

[0177] Step S1101: Two CCD industrial cameras capture detection images for the detection areas on opposite sides of the strip in a direction perpendicular to the feeding direction, and each detection image includes the notches and markings on opposite sides of the strip.

[0178] Step S1102: Position the electrode sheet area based on the grayscale difference between the electrode sheet area and the non-electrode sheet area.

[0179] Step S1103: Determine whether the electrode sheet area has been successfully positioned. If the positioning is successful, execute step S1104. If the positioning is unsuccessful, execute step S1115.

[0180] Step S1104: Identify the notched hole region in each detected image based on the grayscale difference in the image.

[0181] Step S1105: Based on the pixel area of ​​the notched hole region, it is determined whether or not a notched hole exists. If a notched hole exists, step S1106 is executed; if a notched hole does not exist, step S1115 is executed.

[0182] Step S1106: Position the notch detection area based on the position of the notch area.

[0183] Step S1107: The edge detection algorithm obtains the first edge of each notch, and the first edge is the longer edge of the notch closest to the cutter.

[0184] Step S1108: Determine whether edge detection is complete or not. If edge detection is complete, execute step S1109. If edge detection is not complete, execute step S1115.

[0185] Step S1109: Calculate the distance in the feed direction between the first edge in each detected image and the image center point.

[0186] Step S1110: Based on the position of the notch hole, the detection area of ​​the marking portion in each detection image is determined.

[0187] Step S1111: Determine whether or not each detected image contains a marking area based on the difference in grayscale within the detection region.

[0188] Step S1112: Compare and verify the distance and marking detection results obtained from the two detection images.

[0189] Step S1113: Determine whether the absolute value of the difference between the two distances is less than or equal to a predetermined difference and whether the detection results of the two marking parts match. If the absolute value of the difference between the two distances is less than or equal to a predetermined difference and the detection results of the two marking parts match, execute step S1114. If the absolute value of the difference between the two distances exceeds the predetermined difference or the detection results of the two marking parts do not match, execute step S1115.

[0190] Step S1114: The average value of the two distances is obtained to determine the target deviation, and the target deviation and the detection result of the marking unit are transmitted to the programmable controller.

[0191] Step S1115: Send reminder information to the programmable controller.

[0192] According to some embodiments of the present application, as shown in Figure 12, a strip feeding detection device 1200 for a stacking machine is provided, wherein the strip comprises a plurality of first electrode sheets continuously distributed in the feeding direction, and the device 1200 comprises at least one imaging device 1210 arranged to photograph the strip to obtain at least one strip image, and an image processing device 1220 arranged to determine whether the strip image contains a first mark and, in response to the determination that the strip image contains a first mark, to determine the target displacement amount of the first mark relative to a predetermined position based on the strip image.

[0193] The operation of devices 1210 to 1220 in the strip feeding detection device 1200 for the laminating machine is similar to the operation of steps S401 to S403 in the method 400 described above, and therefore will be omitted here.

[0194] According to some embodiments of the present invention, the image processing apparatus comprises a first determination unit arranged to determine whether or not a strip image contains a first mark, and an acquisition unit arranged to respond to the determination that the strip image contains a first mark and to acquire a target displacement amount of the first mark relative to a predetermined position based on the strip image.

[0195] According to some embodiments of the present application, the target displacement includes the displacement of a first mark relative to a predetermined position in the feeding direction.

[0196] According to some embodiments of the present application, the strip image includes a detection region between at least two adjacent first electrode sheets.

[0197] According to some embodiments of the present application, the first mark is a through-hole provided in a detection area, and the strip feeding device for a stacking machine further comprises a front light source and a back light source, and a first controller arranged to illuminate the front light source, which emits light projected onto the front of the detection area, and / or illuminate the back light source, which emits light projected onto the back of the detection area, before being photographed by at least one imaging device, and a first confirmation unit further arranged to determine whether the strip image includes a second mark, which is a predetermined figure formed on the front of the detection area.

[0198] Figure 13 shows a schematic diagram of the structure of a strip feeding detection device in several embodiments of the present application.

[0199] In some embodiments, referring to Figure 13, the strip 1310 is transported to the cutting mechanism 1370 along the feeding direction 1311 by an unwinding device 1320 and a transport device 1330. During the transport process, at least one imaging device 1340 can photograph the detection area of ​​the strip 1310 to acquire a strip image. Based on the strip image, the deviation of the strip 1310 is calibrated, and the composite position of the composite electrode sheet is determined by determining whether the marking portion is included within the detection area in the strip image. A positive light source 1350 and a negative light source 1360 are positioned on the front and back of the detection area of ​​the strip 1310, respectively. The positive light source 1350 is used to illuminate the front area of ​​the detection area, improving the imaging effect of the marking portion. The negative light source 1360 is positioned on the back of the detection area and projects light onto the back of the detection area to illuminate the notched hole area and the non-electrode sheet area, making the boundaries between the electrode sheet area, the non-electrode sheet area and the notched hole area clearer.

[0200] In some embodiments, the imaging device 1340 may be an industrial camera or a machine vision camera, and preferably a high-frame-rate area array CCD industrial camera may be used to acquire sharp strip images.

[0201] In some embodiments, the unwinding device 1320, the conveying device 1330, and the cutting mechanism 1370 may be controlled, for example, by a control system of a programmable controller.

[0202] In some embodiments, at least one imaging device 1340, a positive light source 1350, and a negative light source 1360 may be controlled by a first controller distinct from the control system for operations such as imaging and turning the light sources on / off. The first controller may be, for example, a control unit in a CCD vision detection system.

[0203] In some embodiments, the edges of the strip 1310 may be further provided with at least one sensor (e.g., a photosensitive sensor) to detect notches in the strip 1310. When a sensor detects a notch, it sends a signal to a first controller, which, after receiving the signal, can control the imaging device to take an image of the strip at the notch.

[0204] In some embodiments, the first controller may be the control system. This allows the strip feeding detection device to be controlled by the same control system, saving communication time and resources between systems and improving control efficiency.

[0205] In this way, by simultaneously arranging a positive light source and an anti-light source, the imaging device can collect a strip image containing both the first and second marks, thereby achieving simultaneous detection of both the second and first marks. At the same time, the detection accuracy of the first mark is improved by further enhancing the clarity of the image of the first mark in the strip image.

[0206] According to some embodiments of the present application, a first mark includes a first notch and a second notch located on opposite sides of the strip in a direction perpendicular to the feeding direction, a detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, the first notch is located within the first detection region and the second notch is located within the second detection region, at least one imaging device includes a first imaging device and a second imaging device, and the strip image includes a first detection image obtained by imaging the front of the first detection region with the first imaging device and a second detection image obtained by imaging the front of the second detection region with the second imaging device, wherein the acquisition unit is arranged to respond to a determination that the first mark is contained in the first detection region and the second detection region and to acquire a target displacement amount based on the first detection image and / or the second detection image.

[0207] Figure 14 shows a schematic diagram of the structure of a strip feeding detection device along the strip feeding direction. Here, the strip 1410 has a cross-section perpendicular to the feeding direction. In some embodiments, referring to Figure 14, one imaging device, namely a first imaging device 1421 and a second imaging device 1422, may be placed on each of the opposing sides of the strip 1410 in a direction perpendicular to the feeding direction, and notches and markings may be detected for opposing detection areas on both sides of the strip 1410, respectively.

[0208] In some embodiments, opposing detection regions on either side of the strip 1410 may be positioned above and below the strip 1410, using one positive light source and one back light source, respectively.

[0209] In this way, by installing the first and second imaging devices on opposite sides of the strip feeding direction, the first and second detection images can be collected at opposing positions on both sides of the strip feeding direction, and the target displacement amount can be obtained by simultaneously analyzing the two detection images, thereby improving the accuracy of the displacement amount calculation.

[0210] According to some embodiments of the present application, the acquisition unit is configured to acquire a first displacement of a first notch hole relative to a predetermined position based on a first detection image, a first displacement of a second notch hole relative to a predetermined position based on a second detection image, and a target displacement based on the first and second displacement amounts.

[0211] According to some embodiments of the present application, the acquisition unit is further configured to acquire a target displacement amount based on the first and second displacement amounts in response to a determination that the absolute value of the difference between a first displacement amount and a second displacement amount is less than or equal to a predetermined threshold.

[0212] According to some embodiments of the present invention, the strip feeding detection device for a laminating machine further comprises a first output unit, and a first controller is further configured to control the first output unit to output reminder information in response to the absolute value of the difference between a first deviation and a second deviation being greater than a predetermined threshold.

[0213] According to some embodiments of the present application, the first controller is further configured to control a first output unit to output reminder information in response to a determination that the first mark is not included in at least one of the first detection area and the second detection area.

[0214] According to some embodiments of the present application, the detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, and the second mark includes a first marking portion located within the first detection region and a second marking portion located within the second detection region, wherein the first confirmation unit is arranged to detect whether the first marking portion is included in the first detection image, whether the second marking portion is included in the second detection image, and to determine whether the second mark is included on the front of the detection region based on the detection result for the first marking portion in the first detection image and the detection result for the second marking portion in the second detection image.

[0215] According to some embodiments of the present application, the first confirmation unit is positioned to confirm that a second mark is present on the front of the detection area in response to a determination that a first detection image includes a first marking and a second detection image includes a second marking.

[0216] According to some embodiments of the present invention, the strip feeding detection device for a stacking machine further comprises a second output unit, the first controller is further configured to control the second output unit to output reminder information in response to a determination that a second mark is not included in either the first detection image or the second detection image.

[0217] According to some embodiments of the present invention, the strip feeding detection device for a laminating machine further comprises a second confirmation unit which, in response to a determination that neither the first detection image nor the second detection image contains the second mark, confirms that the second mark is contained on the back of the detection area.

[0218] According to some embodiments of the present application, at least one imaging device includes two sets of imaging devices installed at a predetermined distance apart, wherein one set of imaging devices is arranged to photograph the front of the detection area between two adjacent first electrode sheets, and the other set of imaging devices is arranged to photograph the back of the detection area between two adjacent first electrode sheets.

[0219] Figure 15 shows a schematic diagram of the structure of a strip feeding detection device in several embodiments of the present application.

[0220] In some embodiments, referring to Figure 15, the strip 1510 is transported by an unwinding device 1520 and a transport device 1530 to a cutting mechanism 1570 along the feed direction 1511. During the transport process, a pair of imaging devices 1541 and a pair of imaging devices 1542 may be arranged to photograph the detection areas on the front and back of the strip 1510, respectively. Each pair of imaging devices may include a first imaging device and a second imaging device, respectively, to photograph opposing sides of the strip 1510 perpendicular to the feed direction.

[0221] In some embodiments, two corresponding sets of forward and backward light sources may be provided. As shown in Figure 15, the forward light source 1551 and the backward light source 1561 are used to illuminate the detection area on the front of the strip 1510, and the forward light source 1552 and the backward light source 1562 are used to illuminate the detection area on the back of the strip 1510.

[0222] In some embodiments, the two imaging devices may be positioned at a predetermined distance apart. For example, they may be positioned at a distance apart from one or more first electrode sheets. This ensures that the two sets of forward and reverse light sources for illuminating the front and back of the strip do not interfere with each other, thereby ensuring the imaging quality of the detected image.

[0223] By placing two sets of imaging devices spaced apart on the front and back of the strip, simultaneous detection of markings on both the front and back surfaces of the strip can be achieved, further improving the accuracy of the detection results and the determination of the combined position of the markings.

[0224] According to some embodiments of the present application, the position of at least one imaging device is fixed, and the predetermined position is the optical center of the imaging device.

[0225] In some embodiments, as shown in Figure 13, the distance between the imaging device 1340 and the cutting mechanism 1370 is fixed. The distance between the image center point of the strip image and the first edge of the notch is calculated, and based on the ratio relationship between the image coordinate system and the real-world coordinate system, the distance between the notch in the strip in the real world and the optical center of the imaging device 1340 is calculated as the target displacement. Based on this target displacement and the distance between the imaging device 1340 and the cutting mechanism 1370, the distance from the notch to the cutting mechanism 1370 is calculated, and the movement of the strip 1310 to the cutting mechanism is controlled based on this distance to achieve deviation calibration of the feed.

[0226] By fixing the position of the imaging device, that is, fixing the relative distance between the imaging device and the cutting mechanism, it becomes unnecessary to perform complex operations such as camera calibration. The amount of strip displacement can be calculated solely from the relative distance of the notch in the image to the optical center of the imaging device, saving resources for calculating the strip displacement and improving the efficiency of calculating the strip displacement.

[0227] According to some embodiments of the present application, the positive light source includes a first positive light source and a second positive light source, the first and second positive light sources respectively, arranged on opposite sides of the strip in a direction perpendicular to the feed direction, the light emitted by the first positive light source is projected onto the front of a first detection area, and the light emitted by the second positive light source is projected onto the front of a second detection area.

[0228] Figure 16 shows a schematic diagram of the structure of a strip feeding detection device along the strip feeding direction. Here, the strip 1610 has a cross-section perpendicular to the feeding direction. In some embodiments, referring to Figure 16, one imaging device, namely a first imaging device 1621 and a second imaging device 1622, may be placed on each of the opposing sides of the strip 1610 in a direction perpendicular to the feeding direction, and notches and markings may be detected for opposing detection areas on both sides of the strip 1610, respectively.

[0229] In some embodiments, referring to Figure 16, the positive light source may include a first positive light source 1631 and a second positive light source 1632, and the first positive light source 1631 and the second positive light source 1632 may be positioned on opposite sides of the strip 1610 in a direction perpendicular to the feed direction, with the light emitted by the first positive light source 1631 projected onto the front of a first detection area, and the light emitted by the second positive light source 1632 projected onto the front of a second detection area.

[0230] In some embodiments, the first positive light source 1631 and the second positive light source 1632 may be belt-shaped light sources. This allows the belt-shaped light source to be better applied to the strip shape, thus ensuring better lighting effects while further saving energy.

[0231] In some embodiments, the first positive light source 1631 and the second positive light source 1632 may be white light sources, and illumination with white light sources can further improve the imaging effect and stability of the marking area.

[0232] By installing a pair of positive light sources to illuminate the relative positions on both sides of the strip, the markings captured by the two imaging devices become clearer, improving the identification effect. At the same time, compared to using a single positive light source to illuminate the entire strip, installing a pair of positive light sources allows for adaptation to strips of different widths and saves even more energy.

[0233] According to some embodiments of the present application, referring to Figure 16, positive light sources (which may include, for example, a first positive light source 1631 and a second positive light source 1632) are arranged such that the angle between the light emitted by the positive light sources and the plane on which the strip is located is between 45° and 75°.

[0234] By positioning the positive light source to have an appropriate illumination angle, the imaging effect of the marking area is further improved.

[0235] According to some embodiments of the present application, referring to Figure 16, preferably, the positive light sources (which may include, for example, a first positive light source 1631 and a second positive light source 1632) are arranged such that the angle between the light from the positive light sources and the plane in which the strip is located is 45°.

[0236] Preferably, the imaging effect of the marking area is further optimized by positioning the positive light source so that it forms a 45° angle with the strip.

[0237] According to some embodiments of the present application, referring to Figure 16, the backlight may include a first backlight 1641 and a second backlight 1642, the first backlight 1641 and the second backlight 1642 respectively, positioned on opposite sides of the strip 1610 in a direction perpendicular to the feed direction, the light emitted by the first backlight 1641 projected onto the back of a first detection area, and the light emitted by the second backlight 1642 projected onto the back of a second detection area.

[0238] In some embodiments, the first back light source 1641 and the second back light source 1642 may be belt-shaped light sources. This allows the shape of the belt-shaped light source to be better applied to the shape of the strip, thus ensuring better lighting effects while saving energy.

[0239] By installing a pair of backlights to illuminate the relative positions on both sides of the strip, two imaging devices can capture the notches on the strip edges. At the same time, compared to illuminating the entire strip with a single backlight, installing a pair of backlights allows for adaptation to strips of different widths and saves even more energy.

[0240] According to some embodiments of the present invention, the background light source is a red light source.

[0241] Red light has a wavelength between 625 and 740 nm, making it the longest wavelength in the visible light spectrum. Its penetrating power is higher, allowing for better image results for defective notches where foreign objects block the notch or the notch is not completely punched through.

[0242] In some embodiments, the background light source may be a high-luminance red light source, and its luminance may exceed, for example, 100,000 Lx or more. This can further improve the image effect of the notch in the detected image.

[0243] According to some embodiments of the present invention, the strip feeding detection device for a stacking machine further comprises a prism cooperating with each imaging device, wherein the optical axis of each imaging device is arranged parallel to the plane on which the strip is located, and each imaging device can image a detection area between two first electrode sheets of the strip by means of the cooperating prism.

[0244] Figure 17 shows a schematic diagram of the strip feeding detection device along the strip feeding direction. Here, the strip 1710 is in a cross-section perpendicular to the feeding direction. In some embodiments, the first imaging device 1721 may be positioned with a cooperating first prism 1731 such that its optical axis is parallel to the plane in which the strip 1710 is located. Similarly, the second imaging device 1722 may be positioned with a cooperating second prism 1732 such that its optical axis is parallel to the plane in which the strip 1710 is located.

[0245] Since the focal length of each imaging device is fixed, and the prism and imaging device work together to refract the image of the detection area to the lens of the imaging device, the strip image captured by the imaging device is clear, and at the same time, the installation space of the imaging device can be further reduced, for example, the mounting height of the imaging device can be reduced to one-third of its original height.

[0246] According to several embodiments of the present application, a strip feeding detection device for a stacking machine is provided. Referring to Figure 18, the first imaging device 1821 may be positioned such that its optical axis is parallel to the plane on which the strip 1810 is located, with the help of a cooperating first prism 1831. Similarly, the second imaging device 1822 may be positioned such that its optical axis is parallel to the plane on which the strip 1810 is located, with the help of a cooperating second prism 1832.

[0247] The positive light source includes a first positive light source 1841 and a second positive light source 1842, which are positioned on opposite sides of the strip 1810 in a direction perpendicular to the feed direction. The light emitted by the first positive light source 1841 is projected onto the front of the first detection area, and the light emitted by the second positive light source 1842 is projected onto the front of the second detection area. The first positive light source 1841 and the second positive light source 1842 are positioned at an angle of 45° with respect to the strip 1810. Both the first positive light source 1841 and the second positive light source 1842 are white belt-shaped light sources.

[0248] The backlighting system may include a first backlighting system 1851 and a second backlighting system 1852, the first and second backlighting systems 1851 and 1852 respectively, positioned on opposite sides of the strip 1810 in a direction perpendicular to the feed direction, with light emitted by the first backlighting system 1851 projected onto the back of the first detection area and light emitted by the second backlighting system 1852 projected onto the back of the second detection area. The backlighting system is a high-luminance red light source with a luminance of 100,000 Lx.

[0249] In some embodiments, the first imaging device 1821, the first prism 1831, the first positive light source 1841, and the first back light source 1851 may be arranged in a single mounting mechanism to relatively fix the positions of each part. Similarly, the second imaging device 1822, the second prism 1832, the second positive light source 1842, and the second back light source 1852 may be arranged in a separate mounting mechanism to relatively fix the positions of each part. Different types of strips have different widths (the width range is typically 180-650 mm), and the field of view of the industrial camera is 25 * Because the distance between the two sets of equipment is only 30mm, if the width of the strip changes, the mounting mechanism allows for easy adjustment of the distance between them, thereby enabling detection of different types of strips.

[0250] In some embodiments, the first imaging device 1821, the first positive light source 1841 and the first back light source 1851, as well as the second imaging device 1822, the second positive light source 1842 and the second back light source 1852, can be controlled by a first controller. Here, the first controller may be a control unit in a CCD vision detection system, or it may be a programmable controller for controlling a stacked cell production line.

[0251] In some embodiments, a second controller (i.e., a programmable controller) controls the transport of the strip, and a photosensitive sensor located on the strip edge detects the notch. After detecting the notch, the sensor transmits a signal to the first controller, which then activates the first and second imaging devices to immediately take images of the strip. The notch and markings are identified in the two strip images, and the detection results of the two strip images are compared and verified to obtain the notch displacement and marking detection results for the detected area. These results are then uploaded and stored in the second controller.

[0252] The second controller counts the first electrode sheets in the strip and indicates the combined position of the composite electrode sheets by combining the detection results of the markings corresponding to each first electrode sheet.

[0253] The second controller accurately cuts the strip as a cell strip by counting the first electrode sheets in the strip to determine the tail sheet position of each cell strip, and by aligning the cutting position and cutting mechanism based on the amount of notch hole misalignment corresponding to the tail sheet.

[0254] An embodiment of a third aspect of the present application provides a laminating machine comprising: a transport mechanism arranged for transporting strips; a strip feeding detection device as described in the second aspect; a cutting mechanism; and a second controller arranged to control the strip feeding detection device to calibrate the feeding deviation with respect to the strips transported by the transport mechanism, and to control the cutting mechanism to cut the strips in the transport mechanism after the feeding deviation has been calibrated.

[0255] A fourth embodiment of the present application comprises at least one processor and a memory communicably connected to the at least one processor, the memory storing instructions executable by the at least one processor, the instructions providing an electrical installation to be executed by the at least one processor, enabling the at least one processor to perform the strip feed detection method described in the first embodiment.

[0256] An embodiment of a fifth aspect of the present application provides a non-temporary computer-readable storage medium storing computer instructions, which a computer uses to perform the strip feeding detection method described in the first aspect.

[0257] A sixth embodiment of the present application provides a computer program product including a computer program, which, when executed by a processor, implements the strip feeding detection method described in the first embodiment.

[0258] Finally, it should be understood that the embodiments described above are used solely to illustrate the technical concepts of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the embodiments described above, those skilled in the art will understand that modifications can still be made to the technical concepts described in the embodiments described above, or that some or all of the technical features therein can be replaced with equivalent substitutions, and that such modifications or substitutions will be included within the scope of the claims and specification of the present application without departing from the essence of the corresponding technical concepts. In particular, each technical feature referred to in each embodiment can be combined in any way, as long as no structural inconsistencies arise. The present application is not limited to the specific embodiments disclosed herein, but includes all technical concepts included within the claims. [Explanation of symbols]

[0259] 100 negative electrode strips 101 Negative electrode sheet 102 Notch hole 103 Marking section 104 Feed direction 201 Positive electrode sheet 202 Separator 300 cell strip 301 Cutting position 302 Cutting position 303 Tail Seat 500 strip images 510 Electrode Sheet Area 520 Non-electrode sheet area 511 Electrode Sheet Edge 512 Notch hole 513 Marking section 514 First Edge 515 Notch hole detection area 516 Marking area detection region 530 Image center point 540 Target deviation amount 800 strips 801 Feed direction 810 First detection image 811 First notch hole 812 First marking section 813 First predetermined position 814 First displacement 815 First notch hole edge 820 Second detection image 821 Second notch hole 822 Second marking section 823 Second designated position 824 Second displacement 825 Second notch hole edge 1310 Strip 1311 Feed direction 1320 Unwinding device 1330 Conveying device 1340 Imaging device 1350 Positive light source 1360 Back light source 1370 Cutting mechanism 1410 Strip 1421 First imaging device 1422 Second imaging device 1510 Strip 1511 Feeding direction 1520 Unwinding device 1530 Conveying device 1541 One set of imaging devices 1542 One set of imaging devices 1551 Front light source 1552 Front light source 1561 Backlight source 1562 Backlight source 1570 Cutting mechanism 1610 Strip 1621 First imaging device 1622 Second imaging device 1631 First front light source 1632 Second front light source 1641 First backlight source 1642 Second backlight source 1710 Strip 1721 First imaging device 1722 Second imaging device 1731 First prism 1732 Second prism 1810 Strip 1821 First imaging device 1822 Second imaging device 1831 First prism 1832 Second prism )1841 First front light source 1842 Second front light source 1851 First backlight source 1852 Second backlight source

Claims

1. A strip feeding detection method for a laminating machine, wherein the strip includes a plurality of first electrode sheets continuously distributed in the feeding direction, and the method is Acquire at least one strip image using at least one imaging device, To determine whether the aforementioned strip image includes the first mark and the second mark, The process includes, in response to a determination that the strip image contains the first mark and the second mark, obtaining a target displacement amount of the first mark relative to a predetermined position based on the strip image, The strip image includes a detection region between at least two adjacent first electrode sheets. The first mark is a notch hole provided within the detection area, A strip feeding detection method for a laminating machine, wherein the second mark is a fold formed on the front of the detection area and indicates a composite position on the strip of an electrode sheet with polarity opposite to that of the first electrode sheet.

2. The aforementioned method, Before taking a picture with the at least one imaging device, the emitted light illuminates a positive light source projected onto the front of the detection area, and / or The method according to claim 1, further comprising illuminating a back light source on which the emitted light is projected onto the back of the detection area.

3. The first mark includes a first notch and a second notch located on opposite sides of the strip in a direction perpendicular to the feeding direction, the detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, the first notch is located within the first detection region, and the second notch is located within the second detection region. The method wherein the at least one imaging device includes a first imaging device and a second imaging device, and the strip image includes a first detection image obtained by imaging the front of the first detection area with the first imaging device and a second detection image obtained by imaging the front of the second detection area with the second imaging device. Obtaining the target displacement amount of the first mark relative to a predetermined position based on the aforementioned strip image is: The method according to claim 1, comprising obtaining the target displacement amount based on the first detection image and / or the second detection image in response to a determination that the first detection region and the second detection region contain the first mark and the second mark.

4. Obtaining the target displacement amount based on the first detection image and / or the second detection image is: Based on the first detection image, the first displacement amount of the first notch hole relative to a predetermined position is obtained, Based on the second detection image, the second displacement amount of the second notch hole relative to the predetermined position is obtained, The method according to claim 3, comprising obtaining the target displacement amount based on the first displacement amount and the second displacement amount.

5. Obtaining the target displacement amount based on the first displacement amount and the second displacement amount is, The method according to claim 4, comprising obtaining the target displacement amount based on the first displacement amount and the second displacement amount in response to the absolute value of the difference between the first displacement amount and the second displacement amount being less than or equal to a predetermined threshold.

6. The method according to claim 4, further comprising outputting reminder information in response to the absolute value of the difference between the first amount of deviation and the second amount of deviation being greater than a predetermined threshold.

7. The method according to claim 3, further comprising outputting reminder information in response to a determination that the first mark is not included in at least one of the first detection area and the second detection area.

8. The detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, and the second mark includes a first marking portion located within the first detection region and a second marking portion located within the second detection region, Determining whether the strip image includes the second mark is: To detect whether the first detection image includes the first marking portion, To detect whether the second detection image includes the second marking portion, The method according to claim 3, further comprising determining whether or not the second mark is included on the front of the detection area based on the detection result for the first marking portion in the first detection image and the detection result for the second marking portion in the second detection image.

9. Determining whether or not the second mark is included on the front of the detection area is: The method according to claim 8, comprising determining that the first detection image includes the first marking portion and the second detection image includes the second marking portion, and confirming that the second mark is included on the front of the detection region.

10. The aforementioned method, The method according to claim 8, further comprising outputting reminder information in response to a determination that the second mark is not included in either the first detection image or the second detection image.

11. The aforementioned method, The method according to claim 8, further comprising determining, in response to the determination that neither the first detection image nor the second detection image contains the second mark, that the back surface of the detection area contains the second mark.

12. The aforementioned at least one imaging device includes two sets of imaging devices installed at a predetermined distance apart, and imaging is performed by the aforementioned at least one imaging device. The front of the detection area between two adjacent first electrode sheets is photographed with one of the imaging devices, The method according to claim 1, comprising photographing the back surface of the detection area between two adjacent first electrode sheets with another set of imaging devices.

13. The method according to any one of claims 1 to 12, wherein the target displacement amount includes the displacement amount of the first mark relative to a predetermined position in the feeding direction.

14. The method according to any one of claims 1 to 12, wherein the position of at least one imaging device is fixed and the predetermined position is the optical center of the corresponding imaging device.

15. A strip feeding detection device for a laminating machine, wherein the strip includes a plurality of first electrode sheets continuously distributed in the feeding direction, and the device is At least one imaging device arranged to photograph the strip and obtain at least one strip image, The system includes an image processing apparatus configured to determine whether the strip image includes a first mark and a second mark, and in response to the determination that the strip image includes the first mark and the second mark, to determine the target displacement amount of the first mark relative to a predetermined position based on the strip image, wherein the strip image includes a detection region between at least two adjacent first electrode sheets. The first mark is a notch hole provided within the detection area, The strip feeding detection device for a laminating machine is a strip feeding detection device in which the second mark is formed on the front of the detection area and indicates a composite position on the strip of an electrode sheet with polarity opposite to that of the first electrode sheet.

16. The aforementioned image processing device is A first determining unit is positioned to determine whether the strip image includes the first mark and the second mark, The apparatus according to claim 15, further comprising: an acquisition unit arranged to acquire a target displacement amount of the first mark relative to a predetermined position based on the strip image, in response to a determination that the strip image contains the first mark and the second mark.

17. The apparatus according to claim 15, wherein the target displacement amount includes the displacement amount of the first mark with respect to a predetermined position in the feeding direction.

18. The apparatus according to claim 16, wherein the strip image includes a detection region between at least two adjacent first electrode sheets.

19. The aforementioned device is Front light source and back light source, Before taking a picture with the at least one imaging device, the emitted light illuminates a positive light source projected onto the front of the detection area, and / or The apparatus according to claim 18, further comprising: a first controller positioned to illuminate a back light source onto which the emitted light is projected onto the back of the detection area.

20. The first mark includes a first notch and a second notch located on opposite sides of the strip in a direction perpendicular to the feeding direction, the detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, the first notch is located within the first detection region, and the second notch is located within the second detection region. The at least one imaging device includes a first imaging device and a second imaging device, and the strip image is an apparatus that includes a first detection image obtained by imaging the front of the first detection area with the first imaging device and a second detection image obtained by imaging the front of the second detection area with the second imaging device. The apparatus according to claim 19, wherein the acquisition unit is arranged to acquire the target displacement amount based on the first detection image and / or the second detection image in response to a determination that the first mark is included in the first detection area and the second detection area.

21. The aforementioned acquisition unit is Based on the first detection image, the first displacement amount of the first notch hole relative to a predetermined position is obtained. Based on the second detection image, the second displacement amount of the second notch hole relative to the predetermined position is obtained, and The apparatus according to claim 20, which is configured to obtain the target displacement amount based on the first displacement amount and the second displacement amount.

22. The aforementioned acquisition unit is The apparatus according to claim 21, further configured to acquire the target displacement amount based on the first displacement amount and the second displacement amount, in response to a determination that the absolute value of the difference between the first displacement amount and the second displacement amount is less than or equal to a predetermined threshold.

23. Further comprising a first output unit, The apparatus according to claim 21, wherein the first controller is further arranged to control the first output unit to output reminder information in response to the absolute value of the difference between the first deviation and the second deviation being greater than a predetermined threshold.

24. The first controller is, The apparatus according to claim 23, further configured to control the first output unit to output reminder information in response to a determination that the first mark is not included in at least one of the first detection area and the second detection area.

25. The detection region includes a first detection region and a second detection region located between two adjacent first electrode sheets, and the second mark includes a first marking portion located within the first detection region and a second marking portion located within the second detection region, in an apparatus. The first confirmed unit is, The system detects whether the first detection image includes the first marking portion. The second detection image is used to detect whether or not the second marking portion is included, and The apparatus according to claim 20, which is configured to determine whether or not the second mark is included in the front of the detection area based on the detection result for the first marking portion in the first detection image and the detection result for the second marking portion in the second detection image.

26. The first confirmed unit is, The apparatus according to claim 25, which, in response to a determination that the first detection image includes the first marking portion and the second detection image includes the second marking portion, is configured to determine that the second mark is included on the front of the detection region.

27. Further equipped with a second output unit, The apparatus according to claim 25, wherein the first controller is further arranged to control the second output unit to output reminder information in response to a determination that the second mark is not included in either the first detection image or the second detection image.

28. The apparatus according to claim 25, further comprising a second confirmation unit, which, in response to a determination that neither the first detection image nor the second detection image contains the second mark, is positioned to confirm that the back surface of the detection area contains the second mark.

29. The aforementioned at least one imaging device includes two sets of imaging devices installed at a predetermined distance apart, One of the imaging devices is positioned to photograph the front of the detection area between two adjacent first electrode sheets, and The apparatus according to claim 18, wherein another set of imaging devices is positioned to image the back of the detection area between two adjacent first electrode sheets.

30. The apparatus according to any one of claims 15 to 29, wherein the position of at least one imaging device is fixed, and the predetermined position is the optical center of the imaging device.

31. The apparatus according to any one of claims 20 to 28, wherein the positive light source includes a first positive light source and a second positive light source, and the first positive light source and the second positive light source are respectively arranged on opposite sides of the strip in a direction perpendicular to the feeding direction, the light emitted by the first positive light source is projected onto the front of the first detection area, and the light emitted by the second positive light source is projected onto the front of the second detection area.

32. The apparatus according to any one of claims 19 to 28, wherein the positive light source is arranged such that the angle between the light emitted by the positive light source and the plane on which the strip is located is 45° to 75°.

33. The apparatus according to any one of claims 19 to 28, wherein the positive light source is arranged such that the angle between the light from the positive light source and the plane on which the strip is located is 45°.

34. The apparatus according to any one of claims 20 to 28, wherein the back light source includes a first back light source and a second back light source, and the first back light source and the second back light source are respectively arranged on opposite sides of the strip in a direction perpendicular to the feeding direction, the light emitted by the first back light source is projected onto the back of the first detection area, and the light emitted by the second back light source is projected onto the back of the second detection area.

35. The apparatus according to any one of claims 19 to 28, wherein the background light source is a red light source.

36. The apparatus according to any one of claims 19 to 29, further comprising a prism cooperating with each imaging device, wherein the optical axis of each imaging device is arranged parallel to the plane on which the strip is located, and each imaging device is able to image a detection region between two first electrode sheets of the strip by means of the cooperating prism.

37. A transport mechanism arranged to transport the strip, A strip feeding detection device according to any one of claims 15 to 29, Cutting mechanism, A laminating machine comprising a second controller which controls the strip feeding detection device to calibrate the feeding deviation of the strip being transported by the transport mechanism, and which controls the cutting mechanism to cut the strip in the transport mechanism after the feeding deviation has been calibrated.

38. At least one processor, An electrical device comprising a memory that is communicably connected to at least one processor, The memory stores instructions that can be executed by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 12.

39. A non-temporary computer-readable storage medium storing computer instructions, wherein the computer instructions are used by a computer to perform the method according to any one of claims 1 to 12.

40. A computer program product comprising a computer program, wherein the computer program, when executed by a processor, implements the method described in any one of claims 1 to 12.

Images