Method, apparatus, and device for detecting tape attached to the surface of an electrode sheet, and electrode sheet tape attachment machine

Abstract

A method, apparatus (300), device (400) and electrode sheet surface application tape detection machine, comprising: acquiring a first surface image and a second surface image; setting a color distance between the color of the first tape and the background color on the side away from the tab in the first surface image to a first preset value or more; and setting a color distance between the color of the first tape and the background color on the side away from the tab in the second surface image to a second preset value or more, so that the first tape and the second tape have a clear difference from their corresponding background colors, thereby enabling the shape and position of the first tape relative to the electrode sheet to be detected and identified based on the first surface image, and the shape and position of the second tape relative to the electrode sheet to be detected and identified based on the second surface image, thereby enabling an accurate determination of whether the application of the first tape and the second tape is acceptable, and further improving the safety of the battery.

Description

[Technical Field]

[0001] The present application relates to the technical field of batteries, and more particularly to a method, apparatus, device, and machine for detecting tape applied to the surface of an electrode sheet. [Background technology]

[0002] Currently, electric vehicles mainly use batteries as their power source, which have the characteristics of high capacity, high output voltage, and excellent charge / discharge cycle performance. In the battery manufacturing process, it is generally necessary to wind an anode sheet, a cathode sheet, and a separator onto a core.

[0003] However, with the use of cyclic charging and discharging of the battery, serious lithium deposition phenomenon is likely to occur at the corners of the inner ring of the winding core, and in severe cases, it may even cause deflagration, which has a significant impact on the safety of the battery. Summary of the Invention

[0004] In view of the above problems, the present application provides a method, apparatus, device and electrode sheet tape application machine for detecting tape applied to the surface of an electrode sheet, which can accurately detect whether the tape applied to the surface of an electrode sheet is acceptable, thereby improving the safety of the battery.

[0005] In a first aspect, the present application provides a method for detecting tape attached to the surface of an electrode sheet, the electrode sheet having a first surface and a second surface, with a first tape and a second tape attached to the first surface and the second surface, respectively. The detection method acquires a first surface image and a second surface image, wherein the first surface image includes an image of the first tape and the second surface image includes an image of the second tape, and determines whether the attachment of the first tape and the second tape is acceptable based on the first surface image and the second surface image, where the first surface image includes an image of the first tape and the second surface image includes an image of the second tape, and the color distance between the background color on the side away from the tab in the first surface image and the color of the first tape is equal to or greater than a first preset value and the color distance between the background color on the side away from the tab in the second surface image and the color of the second tape is equal to or greater than a second preset value.

[0006] In the technical solution of the embodiment of the present application, the color distance between the background color of the side away from the tab in the first surface image and the color of the first tape is set to a first preset value or more, and the color distance between the background color of the side away from the tab in the second surface image and the color of the second tape is set to a second preset value or more, so that the first tape and the second tape are clearly different from their corresponding background colors, and therefore the shape and position of the first tape relative to the electrode sheet can be detected and identified based on the first surface image, and the shape and position of the second tape relative to the electrode sheet can be detected and identified based on the second surface image, so that it can be accurately determined whether the attachment of the first tape and the second tape is acceptable, further improving the safety of the battery.

[0007] In one possible embodiment of the first aspect, the color distance between the color of the first tape and the color of the second tape is equal to or greater than a third preset value.

[0008] In the technical proposal of the embodiment of the present application, the color distance between the color of the first tape and the color of the second tape is set to be equal to or greater than a third preset value, thereby limiting the degree of distinction between the color of the first tape and the color of the second tape, thereby enabling the edge of the first tape to be clearly determined from the first surface image and the edge of the second tape to be clearly determined from the second surface image, which helps to improve the accuracy of attachment detection.

[0009] In one possible embodiment of the first aspect, the first preset value is greater than the third preset value and the second preset value is greater than the third preset value.

[0010] In the technical solution of the embodiment of the present application, by setting the magnitude relationship of the three gradation thresholds of the first preset value, the second preset value, and the third preset value, the first tape can be easily distinguished and detected from the background of the first surface image, and the second tape can be easily distinguished and detected from the background of the second surface image, which helps to improve the accuracy of tape detection.

[0011] In one possible embodiment of the first aspect, the background color of the first surface image on the side away from the tab is white, and / or the background color of the second surface image on the side away from the tab is white.

[0012] In the technical solution of the embodiment of the present application, the background color of the side away from the tab in the first surface image is set to white, and the background color of the side away from the tab in the second surface image is set to white, so that the first tape and the second tape can be clearly highlighted and clearly distinguished from the background, thereby allowing the first tape and the second tape to be clearly identified and detected, which helps to improve the accuracy of detecting whether the tape has been applied properly.

[0013] In one possible embodiment of the first aspect, the aforementioned "determining whether the attachment of the first tape and the second tape is acceptable based on the first surface image and the second surface image" includes obtaining a first distance vector from a first end of the first tape away from the tab to a coating boundary away from the tab of the electrode sheet based on the first surface image, obtaining a second distance vector from a first end of the second tape away from the tab to a coating boundary away from the tab of the electrode sheet based on the second surface image, and determining whether the attachment of the first tape and the second tape is acceptable based on the first distance vector and the second distance vector.

[0014] In the technical solution of the embodiments of the present application, a first distance vector and a second distance vector are obtained by performing discrimination detection on the first surface image and the second surface image, and then it is possible to accurately determine whether the application of the first tape and the second tape is acceptable based on the magnitude and direction of the first distance vector and the second distance vector.

[0015] In one possible embodiment of the first aspect, the aforementioned "determining whether the attachment of the first tape and the second tape is acceptable based on the first distance vector and the second distance vector" includes determining that the attachment of the first tape and the second tape is acceptable if the direction toward the tab is the positive direction and the first distance vector is greater than 0 and the second distance vector is greater than 0.

[0016] In the technical solution of the embodiment of the present application, the directions of the first distance vector and the second distance vector can be used to accurately determine whether the attachment of the first tape and the second tape is acceptable.

[0017] In one possible embodiment of the first aspect, the aforementioned "determining whether the attachment of the first tape and the second tape is acceptable based on the first distance vector and the second distance vector" includes determining that the attachment of the first tape and the second tape is acceptable if the absolute value of the difference between the first distance vector and the second distance vector is within a predetermined range.

[0018] In the technical solution of the embodiment of the present application, by comparing the absolute value of the difference between the first distance vector and the second distance vector with a preset range, it is possible to accurately determine whether the attachment of the first tape and the second tape is acceptable.

[0019] In one possible embodiment of the first aspect, an insulating coating is installed between the coating boundary close to the tab of the electrode sheet and the tab, the color distance between the color of the insulating coating and the color of the first film is equal to or greater than a fourth preset value, the distance between the color of the insulating coating and the color of the second film is equal to or greater than a fifth preset value, the color distance between the background color of the side close to the tab in the first surface image and the color of the insulating coating is equal to or greater than a sixth preset value, and the color distance between the background color of the side close to the tab in the second surface image and the color of the insulating coating is equal to or greater than the sixth preset value.

[0020] The aforementioned "determining whether the attachment of the first tape and the second tape is acceptable based on the first surface image and the second surface image" further includes determining whether the second end of the first tape close to the tab is between the boundary of the insulating coating close to the tab and the boundary of the insulating coating away from the tab based on the first surface image, determining whether the second end of the second tape close to the tab is between the boundary of the insulating coating close to the tab and the boundary of the insulating coating away from the tab based on the second surface image, and determining that the attachment of the first tape and the second tape is acceptable if the second end of the first tape close to the tab is between the boundary of the insulating coating close to the tab and the boundary of the insulating coating away from the tab and the second end of the second tape is between the boundary of the insulating coating close to the tab and the boundary of the insulating coating away from the tab.

[0021] In the technical solution of the embodiment of the present application, the color distance between the color of the insulating coating and the color of the first tape is equal to or greater than a fourth preset value, so that the difference between the color of the first tape and the color of the insulating coating is obvious, making it easy to distinguish between the first tape and the insulating coating during image detection. The color distance between the color of the insulating coating and the color of the second tape is equal to or greater than a fifth preset value, so that the difference between the color of the second tape and the color of the insulating coating is obvious, making it easy to distinguish between the second tape and the insulating coating during image detection. On the other hand, by setting the color distance between the color of the insulating coating and the background color of the side adjacent to the tab in the first surface image to a sixth preset value or greater, and setting the color distance between the color of the insulating coating and the background color of the side adjacent to the tab in the second surface image to a sixth preset value or greater, the colors of the insulating coatings on the first and second surfaces are clearly visible in the first and second surface images, respectively, so that the two boundaries of the insulating coating can be more accurately detected when identifying and detecting the first surface image, and the two boundaries of the insulating coating can be more accurately detected when identifying and detecting the second surface image. These two aspects effectively improve the accuracy of applied tape detection.

[0022] In one possible embodiment of the first aspect, the sixth preset value is greater than the fourth preset value and / or the sixth preset value is greater than the fifth preset value.

[0023] In the technical solution of the embodiment of the present application, by setting the magnitude relationship of the three gray scale thresholds of the fourth preset value, the fifth preset value, and the sixth preset value, the insulating coating can be easily distinguished and detected from the background of the first surface image and from the background of the second surface image, which helps to improve the accuracy of tape detection.

[0024] In one possible embodiment of the first aspect, the background color of the side of the first surface image adjacent to the tab is black, and / or the background color of the side of the second surface image adjacent to the tab is black.

[0025] In the technical solution of the embodiment of the present application, the background color of the side closest to the tab in the first surface image is set to black, and the background color of the side closest to the tab in the second surface image is set to black, thereby clearly distinguishing between the insulating coating of the electrode sheet and the background, allowing the two boundaries of the insulating coating to be clearly identified, which helps to improve the accuracy of detecting whether the tape has been applied properly.

[0026] In a second aspect, the present application provides an apparatus for detecting tape attached to the surface of an electrode sheet, comprising an image acquisition module and an attachment pass / fail determination module, wherein the image acquisition module is used to acquire a first surface image and a second surface image, wherein the first surface image includes an image of the first tape, the second surface image includes an image of the second tape, and a color distance between a background color on a side away from the tab in the first surface image and the color of the first tape is equal to or greater than a first preset value, and a color distance between a background color on a side away from the tab in the second surface image and the color of the second tape is equal to or greater than a second preset value, and the attachment pass / fail determination module is used to determine whether the attachment of the first tape and the second tape is pass / fail based on the first surface image and the second surface image.

[0027] In the technical solution of the embodiment of the present application, the color distance between the background color of the side away from the tab in the first surface image and the color of the first tape is set to a first preset value or more, and the color distance between the background color of the side away from the tab in the second surface image and the color of the second tape is set to a second preset value or more, so that the first tape and the second tape are clearly different from their corresponding background colors, and therefore the shape and position of the first tape relative to the electrode sheet can be detected and identified based on the first surface image, and the shape and position of the second tape relative to the electrode sheet can be detected and identified based on the second surface image, so that it can be accurately determined whether the attachment of the first tape and the second tape is acceptable, further improving the safety of the battery.

[0028] In a third aspect, the present application provides an electrode sheet-attached tape detection device, the electrode sheet having a first surface and a second surface, a first tape and a second tape attached to the first surface and the second surface, respectively, at predetermined positions of the electrode sheet, the electrode sheet-attached tape detection device including a first image capture device, a second image capture device, a processor, and a memory.

[0029] wherein a first image capture device is used to capture a first surface image, the first surface image including an image of the first tape, wherein a color distance between a background color on a side away from the tab in the first surface image and the color of the first tape is equal to or greater than a first preset value; a second image capture device is used to capture a second surface image, the second surface image including an image of the second tape, wherein a color distance between a background color on a side away from the tab in the second surface image and the color of the second tape is equal to or greater than a second preset value; a processor is communicatively coupled to the first image capture device and the second image capture device, respectively, to capture the first surface image and the second surface image; a memory is communicatively coupled to the processor, the memory storing instructions executable by the processor, the instructions being executable by the processor to cause the processor to perform the method of the first aspect;

[0030] In the technical solution of the embodiment of the present application, the electrode sheet attachment tape detection device can accurately detect whether the attachment of the tape placed on the surface of the electrode sheet is acceptable.

[0031] In a fourth aspect, the present application provides an electrode sheet application tape machine, which includes the electrode sheet application tape detection device according to the third aspect.

[0032] In the technical solution of the embodiment of the present application, the electrode sheet application tape machine has an accurate tape detection function, which helps to ensure that the electrode sheet application tape is of acceptable quality.

[0033] The above description is only a summary of the technical solution of the present application, and in order to more clearly understand the technical solution of the present application, which can be implemented based on the contents of the specification, and to make the above and other objects, features and advantages of the present application more comprehensible, specific embodiments of the present application are specifically cited below. [Brief explanation of the drawings]

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustrating the preferred embodiments only and are not intended to limit the scope of the present application. In addition, like parts are designated by like reference numerals in all drawings.

[0035] FIG. 1 is a schematic diagram of a winding core in some embodiments of the present application.

[0036] FIG. 2 is a schematic diagram of an electrode sheet attachment tape according to some embodiments of the present application.

[0037] FIG. 3 is a flowchart of a method for detecting tape attached to the surface of an electrode sheet according to some embodiments of the present application.

[0038] FIG. 4(a) is a schematic diagram of capturing a first surface image in some embodiments of the present application.

[0039] FIG. 4(b) is a schematic diagram of capturing a second surface image in some embodiments of the present application.

[0040] FIG. 5 is a schematic diagram of a color space in some embodiments of the present application.

[0041] FIG. 6 is a sub-flowchart of step S20 in the method shown in FIG.

[0042] FIG. 7 is a schematic diagram of a first distance vector X and a second distance vector Y in some embodiments of the present application.

[0043] FIG. 8 is another sub-flowchart of step S20 in the method shown in FIG.

[0044] FIG. 9 is a structural schematic diagram of an electrode sheet surface-attached tape detection device 300 according to some embodiments of the present application.

[0045] FIG. 10 is a structural schematic diagram of an electrode sheet-attached tape detection device 400 according to some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0046] The following detailed description will be given of the embodiments of the technical solution of the present application with reference to the drawings. The following embodiments are used to more clearly explain the technical solution of the present application, and are therefore only used as examples, and do not limit the scope of protection of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used herein are only used to describe specific embodiments and are not intended to limit the present application. The terms "comprises" and "having" and any variations thereof in the specification and claims of this application and the description of the drawings above are intended to cover the non-exclusive "comprises."

[0048] In the description of the embodiments of the present application, technical terms such as "first," "second," etc. are used only to distinguish between different objects, and should not be understood to indicate or imply relative importance, or to imply the quantity, specific order, or hierarchical relationship of the indicated technical features. Unless otherwise clearly limited, in the description of the embodiments of the present application, "plurality" means two or more.

[0049] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a relational relationship describing related objects, and indicates that three types of relationships may exist, for example, A and / or B indicates three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this specification generally indicates that the related objects before and after are in an "or" relationship.

[0051] In describing the embodiments of the present application, the term "plurality" refers to two or more (including two); similarly, "multiple sets" refers to two or more (including two sets); and "plurality" refers to two or more (including two).

[0052] In describing the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience and simplification of the description of the embodiments of the present application. They do not indicate or imply that a specified device or element must have a specific orientation or be configured and operated in a specific orientation, and therefore should not be understood as limitations on the embodiments of the present application.

[0053] In describing the embodiments of the present application, unless otherwise clearly specified or limited, terms such as "attached," "coupled," "connected," and "fixed" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0054] With the development of green energy, the application of batteries is becoming more and more widespread, especially in the fields of new energy automobiles, information appliances, and solar power generation, which have become popular in recent years, batteries are important energy storage and power supply devices, such as supplying power to new energy automobiles or terminal devices, and storing energy in solar panels. As the application fields of batteries expand, the market demand for batteries is also expanding.

[0055] However, with the use of cyclic charging and discharging of the battery, serious lithium deposition phenomenon is likely to occur at the corner of the innermost ring of the winding core, and in severe cases, it may even cause deflagration, which has a significant impact on the safety of the battery.

[0056] Currently, as shown in Figure 1, a tape application process is typically implemented between the die-strip dividing process and the winding process to apply tape to the two corners of the innermost electrode sheet on the winding core, effectively preventing lithium deposition. Specifically, as shown in Figure 2, after die-strip dividing of the electrode sheet is completed, the first tab of the electrode sheet is referenced (the first tab is wound onto the winding core first when the electrode sheet is wound), and the center line position L1 of the first pair of tapes is positioned a predetermined distance (e.g., 51 ± 2 mm) from the first tab. The tape application machine then applies the first and second tapes to the A and B sides of the electrode sheet at L1. The center line position L2 of the second pair of tapes is positioned another predetermined distance (e.g., 250 ± 2 mm) from the first tab. The tape application machine then applies the first and second tapes to the A and B sides of the electrode sheet at L2. It should be understood that the A and B sides in this context refer to the two surfaces of the electrode sheet.

[0057] After the tape is applied to the innermost corner of the winding core, e.g., L1, the ends of the first and second tapes on the side closest to the tab are between the two boundaries of the insulating coating, and the ends of the first and second tapes on the side away from the tab extend beyond the boundary of the electrode sheet by a certain distance, e.g., 2 to 3 mm, although it will be appreciated that the specific length of the extension can be set according to actual conditions. This ensures that the ends of the first and second tapes on the side away from the tab of the electrode sheet are "laminated," i.e., hung together and overlap, so that the first and second tapes are less likely to fall off during the subsequent winding of the electrode sheet and can effectively prevent lithium deposition at the inner corner of the electrode sheet (i.e., the locations L1 and L2).

[0058] After the tape is applied, it must first be detected to determine whether the tape applied to the surface of the electrode sheet is properly applied. Typically, a camera is used to photograph the electrode sheet, and the captured image is then processed to complete the tape application pass / fail detection and mark any detected failed tapes. However, because the tape is difficult to distinguish during detection, the detection results are inaccurate, meaning that foolproof monitoring of tape detachment is not possible.

[0059] Based on the above considerations, the inventors of the present application have conducted research and discovered that by setting the color of the tape and the color of the background, the difference between the colors of the tape and the background becomes greater, making it easier to identify and distinguish the tape when detecting and identifying the image. Therefore, it is possible to accurately detect whether the tape attached to the surface of the electrode sheet is acceptable, thereby improving the safety of the battery.

[0060] Specifically, the electrode sheet has a first surface and a second surface, and a first tape and a second tape are attached to the first surface and the second surface, respectively. First, a first surface image and a second surface image are acquired, where the first surface image includes an image of the first tape and the second surface image includes an image of the second tape. Here, a color distance between a background color on a side away from the tab in the first surface image and the color of the first tape is equal to or greater than a first preset value, and a color distance between a background color on a side away from the tab in the second surface image and the color of the second tape is equal to or greater than a second preset value.

[0061] Next, it is determined whether the application of the first tape and the second tape is acceptable based on the first surface image and the second surface image.

[0062] Based on the color distance between the background color on the side away from the tab in the first surface image and the color of the first tape being equal to or greater than a first preset value, the difference between the color of the first tape and the background color thereunder is obvious, making it easy to identify and distinguish the first tape during image detection.

[0063] Based on the color distance between the background color on the side away from the tab in the second surface image and the color of the second tape being equal to or greater than a second preset value, the difference between the color of the second tape and the background color therebelow is obvious, making it easy to identify and distinguish the second tape during image detection.

[0064] In the above solution, the color distance between the background color on the side away from the tab in the first surface image and the color of the first tape is set to a first preset value or more, and the color distance between the background color on the side away from the tab in the second surface image and the color of the second tape is set to a second preset value or more, so that the first tape and the second tape are clearly different from their corresponding background colors.This makes it possible to detect and identify the shape and position of the first tape relative to the electrode sheet based on the first surface detection, and to detect and identify the shape and position of the second tape relative to the electrode sheet based on the second surface image, so that it can be accurately determined whether the attachment of the first tape and the second tape is acceptable, further improving the safety of the battery.

[0065] The method provided by the embodiments of the present application relates to a method for detecting tape attached to the surface of an electrode sheet, and the method can be applied to a device for detecting tape attached to an electrode sheet.

[0066] As can be understood, when application tape detection is performed, i.e., when a tape application process introduced between the mold strip dividing process and the winding process is performed, application tape detection is performed and an electrode sheet application tape detection apparatus is installed in the electrode sheet application tape machine, thereby making it possible to apply the electrode sheet application tape detection apparatus to the electrode sheet application tape machine and providing the electrode sheet application tape machine with an application tape detection function, and thereby the electrode sheet application tape machine includes an electrode sheet application tape detection device.

[0067] According to some embodiments of the present application, as shown in FIG. 3, FIG. 3 is a flowchart of a method for detecting tape attached to the surface of an electrode sheet provided by an embodiment of the present application, and the method S200 specifically includes the following steps:

[0068] S10: A first surface image and a second surface image are acquired.

[0069] As can be understood, the electrode sheet has a first surface and a second surface, and the electrode sheet here can be a cathode sheet or an anode sheet, for example, when tape is attached to the cathode sheet and tape detection is required, the electrode sheet here is a cathode sheet, and when tape is attached to the anode sheet and tape detection is required, the electrode sheet here is an anode sheet, so the electrode sheet can be a cathode sheet or an anode sheet according to the actual situation, and there is no limitation here.

[0070] The electrode sheet has a sheet-like structure, and the first and second surfaces are the front and back surfaces of the electrode sheet, also called the A and B surfaces. If the surface facing the central axis of the winding core is the front surface (or A surface) and the surface away from the central axis is the back surface (or B surface), then when the first surface is the front surface (or A surface), the second surface is the back surface (or B surface), and when the first surface is the back surface (or B surface), the second surface is the front surface (or A surface).

[0071] A first tape and a second tape are attached to the first surface and the second surface, respectively. Referring again to FIG. 2, as shown in FIG. 2, the first tape is attached to L1 and L2 on the first surface of the electrode sheet, and the second tape is attached to L1 and L2 on the second surface of the electrode sheet. The center lines of the first tape and the second tape both substantially overlap with L1 or L2, so that the projections of the first tape and the second tape in a direction perpendicular to the electrode sheet also substantially overlap. Furthermore, both the first tape and the second tape extend beyond the boundary of the electrode sheet on the side away from the tab, i.e., both the first tape and the second tape have protrusions, and the protrusions are attached together by electrostatic force.

[0072] Here, the first surface image includes an image of the first tape, and the second surface image includes an image of the second tape. For example, as shown in Figure 4, during the process of transporting the electrode sheet, camera 1# can photograph the first surface to obtain the first surface image, whereby the first surface image includes the first tape, and camera 2# can photograph the second surface to obtain the second surface image, whereby the second surface image includes the second tape.

[0073] The color distance between the background color on the side away from the tab in the first surface image and the color of the first tape is equal to or greater than a first preset value. As can be understood, when capturing the first surface image, a background can be placed below the electrode sheet, such as a transmission table, a roller, or a background board. The background color on the side away from the tab (i.e., the background color below the leading edge of the first tape) and the color of the first tape are set to two colors that are significantly different from each other. Specifically, as shown in FIG. 5 , in color space, the color distance between the background color on the side away from the tab in the first surface image and the color of the first tape is equal to or greater than a first preset value, making it easy to identify and distinguish the color of the first tape from the background color below it.

[0074] The color distance between the background color on the side away from the tab in the second surface image and the color of the second tape is equal to or greater than a second preset value. As can be understood, when capturing the second surface image, a background can be placed below the electrode sheet, such as a transmission table, a roller, or a background board. The background color on the side away from the tab (i.e., the background color below the leading edge of the second tape) and the color of the second tape are set to two colors that are significantly different from each other. Specifically, referring again to FIG. 5 , in color space, the color distance between the background color on the side away from the tab in the second surface image and the color of the second tape is equal to or greater than the second preset value, making it easier to identify and distinguish the color of the second tape from the background color below it.

[0075] It can be understood that the first and second preset values ​​are empirical values ​​and can be specifically set by those skilled in the art according to the needs of image detection, and are not limited herein. Here, the color space can be the RGB color space or the CMY color space, etc., and are not limited herein. The color distance is the distance between two colors in the color space.

[0076] In some embodiments, when the first surface image and the second surface image are three-channel color images, the color distance can be calculated using the three-channel grayscale values. Specifically, the color distance between color C1 and color C2 can be calculated using the following formula:

number

number

[0077] In some embodiments, the color distance may be calculated using the gradation value of a single channel, for example, the color distance between color C1 and color C2 is calculated using the gradation value of the R channel, and the specific formula is as follows:

number

number

[0078] As can be seen, the larger the color distance, the larger the color difference between the two colors, making them easier to distinguish, while the smaller the color distance, the smaller the color difference between the two colors, making them harder to distinguish.

[0079] S20: Based on the first surface image and the second surface image, it is determined whether the attachment of the first tape and the second tape is acceptable.

[0080] After obtaining a first surface image that makes it easy to distinguish the first tape and a second surface image that makes it easy to distinguish the second tape, a conventional image identification algorithm or pixel comparison algorithm can be applied to the first surface image and the second surface image to obtain the shape and position of the first tape and the shape and position of the second tape, and by comparing the shapes and positions of the first tape and the second tape, it can be determined whether the application of the first tape and the second tape is acceptable.

[0081] In this embodiment, the color distance between the background color on the side away from the tab in the first surface image and the color of the first tape is set to a first preset value or more, and the color distance between the background color on the side away from the tab in the second surface image and the color of the second tape is set to a second preset value or more, so that the first tape and the second tape are clearly different from their corresponding background colors. This makes it possible to detect and identify the shape and position of the first tape relative to the electrode sheet based on the first surface image, and to detect and identify the shape and position of the second tape relative to the electrode sheet based on the second surface image. This makes it possible to accurately determine whether the application of the first tape and the second tape is acceptable, further improving the safety of the battery.

[0082] According to some embodiments of the present application, preferably, the color distance between the color of the first tape and the color of the second tape is equal to or greater than a third preset value.

[0083] If the pasting is successful, the start of the first tape and the start of the second tape will overlap, and in order to better distinguish between the first tape and the second tape, the color distance between the color of the first tape and the color of the second tape is set to be equal to or greater than a third preset value. As can be understood, the third preset value is a set gradation value threshold, which is used to limit the degree of distinction between the color of the first tape and the color of the second tape, and can be specifically set by those skilled in the art according to actual circumstances.

[0084] In some embodiments, the first tape may be brown (the gradation value of the brown R channel is 80-90), the second tape may be blue (the gradation value of the blue R channel is 40-50), and the third preset value may be 20 or 30, etc. The degree of distinction based on the brown and blue colors is high, so that even if the first tape and the second tape overlap, the cue boundary of the first tape can be clearly determined from the first surface image, and the cue boundary of the second tape can be clearly determined from the second surface image.

[0085] As can be seen, in some embodiments, the first tape and the second tape are very thin and have a certain degree of translucency, so even if the start of the first tape and the start of the second tape overlap, the overlapping portion has a deep color, making the start boundary of the first tape and the start boundary of the second tape clear and easy to distinguish. Therefore, in this embodiment, even if the colors of the first tape and the second tape are similar or the same, the start boundary of the first tape can be clearly determined from the first surface image, and the start boundary of the second tape can be clearly determined from the second surface image.

[0086] In the above embodiment, by setting the color distance between the color of the first tape and the color of the second tape to be equal to or greater than a third preset value, the degree of distinction between the color of the first tape and the color of the second tape is limited, thereby making it possible to clearly determine the leading edge boundary of the first tape from the first surface image and the leading edge boundary of the second tape from the second surface image, which helps to improve the accuracy of attachment detection.

[0087] According to some embodiments of the present application, preferably, the first preset value is greater than the third preset value, and the second preset value is greater than the third preset value.

[0088] As can be seen, the first preset value is used to limit the degree of distinction between the color of the first tape and the background color on the side away from the tab in the first surface image, the second preset value is used to limit the degree of distinction between the color of the second tape and the background color on the side away from the tab in the second surface image, and the third preset value is used to limit the degree of distinction between the color of the first tape and the color of the second tape.

[0089] Based on the fact that the larger the gradation threshold value, the higher the degree of distinction, by setting the first preset value larger than the third preset value, the degree of distinction between the color of the first tape and the background color on the side away from the tab in the first surface image is higher than the degree of distinction between the color of the first tape and the color of the second tape, thereby making it easier to distinguish and detect the first tape from the background of the first surface image; similarly, by setting the second preset value larger than the third preset value, the degree of distinction between the color of the second tape and the background color on the side away from the tab in the second surface image is higher than the degree of distinction between the color of the first tape and the color of the second tape, thereby making it easier to distinguish and detect the second tape from the background of the second surface image.

[0090] In this embodiment, by setting the magnitude relationship of the three gradation thresholds, the first preset value, the second preset value, and the third preset value, it becomes easier to distinguish and detect the first tape from the background of the first surface image, and easier to distinguish and detect the second tape from the background of the second surface image, which helps to improve the accuracy of tape detection.

[0091] According to some embodiments of the present application, preferably, the background color of the first surface image on the side away from the tab is white, and / or the background color of the second surface image on the side away from the tab is white.

[0092] For example, as shown in Figure 4 again, when capturing the first surface image, a roller can be placed under the second surface of the electrode sheet based on the viewing angle of camera 1# to transport the electrode sheet, while the roller can be used as the background for capturing the first surface image. The area where the edge of the electrode sheet away from the tab is projected onto the roller is the background color of the side away from the tab in the first surface image, and the area where the edge of the electrode sheet away from the tab is projected onto the roller is set to white.

[0093] As can be seen, when capturing the first surface image, a background plate is placed below the second surface of the electrode sheet based on the viewing angle of camera 1#, and the area where the electrode sheet edge away from the tab is projected onto the background plate is the background color of the side away from the tab in the first surface image, and the area where the electrode sheet edge away from the tab is projected onto the background plate is set to white.

[0094] Since the gradation value of white is around 255, it is clearly distinguishable from the color of the electrode sheet (electrode sheets are generally black), which allows the electrode sheet edge to be clearly detected. Furthermore, white is also clearly distinguishable from the color of the first tape, which allows the cue boundary of the first tape to be clearly identified and detected.

[0095] Similarly, in some embodiments, when capturing the second surface image, a roller can be placed under the first surface of the electrode sheet based on the viewing angle of camera 2# to transport the electrode sheet, while the roller can serve as a background for capturing the second surface image. The area where the edge of the electrode sheet away from the tab is projected onto the roller is the background color of the area away from the tab in the second surface image, and the area where the edge of the electrode sheet away from the tab is projected onto the roller is set to white.

[0096] As can be seen, when capturing the second surface image, a background plate is placed below the first surface of the electrode sheet based on the viewing angle of camera 2#, and the area where the electrode sheet edge away from the tab is projected onto the background plate is the background color of the side away from the tab in the second surface image, and the area where the electrode sheet edge away from the tab is projected onto the background plate is set to white.

[0097] Since the gradation value of white is around 255, it is clearly distinguishable from the color of the electrode sheet (electrode sheets are generally black), which allows the electrode sheet edge to be clearly detected.In addition, white is also clearly distinguishable from the color of the second tape, which allows the start boundary of the second tape to be clearly identified and detected.

[0098] In this embodiment, the background color of the side away from the tab in the first surface image is set to white, and the background color of the side away from the tab in the second surface image is set to white, so that the first tape and the second tape can be clearly highlighted and clearly distinguished from the background, thereby allowing the first tape and the second tape to be clearly identified and detected, which helps to improve the accuracy of detecting whether the tape has been applied successfully.

[0099] According to some embodiments of the present application, preferably, as shown in FIG. 6, the above step S20 specifically includes:

[0100] S21: Based on the first surface image, a first distance vector is obtained from a first end of the first tape away from the tab to a coating boundary of the electrode sheet away from the tab.

[0101] S22: Based on the second surface image, a second distance vector is obtained from the first end of the second tape away from the tab to the coating boundary of the electrode sheet away from the tab.

[0102] S23: Based on the first distance vector and the second distance vector, it is determined whether the attachment of the first tape and the second tape is acceptable.

[0103] As shown in FIG. 7(a), in the first surface image, a conventional edge detection algorithm can be used to obtain the edge of the first tape, thereby obtaining the first end of the first tape away from the tab, i.e., the edge boundary of the first tape away from the tab. As can be seen, an electrode sheet coating is applied to both the first and second surfaces of the electrode sheet, and a conventional edge detection algorithm can be used to obtain the edge of the electrode sheet coating, i.e., to capture the coating boundary on the electrode sheet away from the tab. The pixel distance from the edge boundary of the first tape away from the tab to the coating boundary on the electrode sheet away from the tab can be converted to obtain a first distance vector X from the first end of the first tape away from the tab to the coating boundary on the electrode sheet away from the tab.

[0104] As shown in FIG. 7(b), in the second surface image, a conventional edge detection algorithm can be used to obtain the edge of the second tape, thereby obtaining the first end of the second tape away from the tab, i.e., the edge boundary of the second tape away from the tab. As can be seen, an electrode sheet coating is applied to both the first and second surfaces of the electrode sheet, and a conventional edge detection algorithm can be used to obtain the edge of the electrode sheet coating, i.e., to capture the coating boundary on the electrode sheet away from the tab. The pixel distance from the edge boundary of the second tape away from the tab to the coating boundary on the electrode sheet away from the tab can be converted to obtain a second distance vector Y from the first end of the second tape away from the tab to the coating boundary on the electrode sheet away from the tab.

[0105] As can be understood, in FIGS. 7(a) and 7(b), the actual proportions are adjusted to clearly show the first distance vector X and the second distance vector Y, i.e., the proportions in FIGS. 7(a) and 7(b) are not intended to be limiting of the present application.

[0106] After obtaining the first distance vector X and the second distance vector Y, it can be determined whether the attachment of the first tape and the second tape is acceptable based on the magnitude and direction of the first distance vector X and the magnitude and direction of the second distance vector Y. For example, if the first distance vector X and the second distance vector Y are both oriented toward the tab, it indicates that the first end of the first tape away from the tab and the first end of the second tape away from the tab both exceed the coating boundary away from the tab of the electrode sheet, i.e., there is a protrusion in both the first tape and the second tape, and the protrusions can further be electrostatically bonded together, making them less likely to fall off during the subsequent roller winding process.

[0107] In this embodiment, by performing discrimination detection on the first surface image and the second surface image, a first distance vector and a second distance vector are obtained, and then based on the magnitude and direction of the first distance vector and the second distance vector, it can be accurately determined whether the application of the first tape and the second tape is acceptable.

[0108] According to some embodiments of the present application, preferably, the above step S23 specifically includes:

[0109] The direction toward the tab is defined as the positive direction. If the first distance vector is greater than 0 and the second distance vector is greater than 0, it is determined that the attachment of the first tape and the second tape is acceptable.

[0110] 7(a) and 7(b), the direction toward the tab is defined as the positive direction, i.e., the direction of arrow e is defined as the positive direction. When the first distance vector is greater than 0, the first distance vector faces in the positive direction, indicating that the first end of the first tape away from the tab exceeds the coating boundary of the electrode sheet away from the tab. When the second distance vector is greater than 0, the second distance vector faces in the positive direction, indicating that the first end of the second tape away from the tab exceeds the coating boundary of the electrode sheet away from the tab. In other words, both the first tape and the second tape have protruding edges, and these protruding edges can be electrostatically bonded together, making them less likely to fall off during the subsequent winding process.

[0111] In this embodiment, the directions of the first distance vector and the second distance vector can accurately determine whether the application of the first tape and the second tape is acceptable.

[0112] According to some embodiments of the present application, preferably, the above step S23 specifically includes:

[0113] If the absolute value of the difference between the first distance vector and the second distance vector is within a preset range, it is determined that the attachment of the first tape and the second tape is acceptable.

[0114] Here, the absolute value of the difference between the first distance vector X and the second distance vector Y is |XY|. The preset range [0, N] is an empirical value set by a person skilled in the art based on the tape cueing situation, and N may be 3 mm, for example.

[0115] If 0≦|XY|≦N, it indicates that the first end of the first tape away from the tab exceeds the coating boundary of the electrode sheet away from the tab, and the first end of the second tape away from the tab exceeds the coating boundary of the electrode sheet away from the tab, i.e., both the first tape and the second tape have overhang and the application is approved. As can be seen, if |XY|>3, it indicates an "irrational situation" has occurred. For example, if the overhang of the first tape is 3 mm, the second tape may have no overhang or the overhang of the second tape may be greater than 6 mm, which is inconsistent with the installation and indicates that the application of the tape is unacceptable.

[0116] In this embodiment, by comparing the absolute value of the difference between the first distance vector and the second distance vector with a preset range, it can be accurately determined whether the application of the first tape and the second tape is acceptable.

[0117] According to some embodiments of the present application, an insulating coating is preferably provided between the tab and the coating boundary of the electrode sheet adjacent to the tab, as shown in Figure 7. As can be seen, the insulating coating is made of an insulating material. The insulating coating can prevent internal short circuits due to contact between the adjacent electrode sheet coating and the electrode sheet foil material.

[0118] The color distance between the color of the insulating coating and the color of the first tape is equal to or greater than a fourth preset value, and the color distance between the color of the insulating coating and the color of the second tape is equal to or greater than a fifth preset value.

[0119] Here, the fourth preset value is a set gradation threshold value used to limit the degree of distinction between the color of the first tape and the color of the insulating coating. The fifth preset value is a set gradation threshold value used to limit the degree of distinction between the color of the second tape and the color of the insulating coating. It can be understood that the fourth preset value and the fifth preset value can be specifically set by those skilled in the art according to actual circumstances, and in some embodiments, the fourth preset value may be the same or different.

[0120] As can be seen, the larger the color distance, the larger the color difference between the two colors, making them easier to distinguish; the smaller the color distance, the smaller the color difference between the two colors, making them harder to distinguish.

[0121] In the color space, the color distance between the color of the insulating coating and the color of the first tape is equal to or greater than the fourth preset value, so that the difference between the color of the first tape and the color of the insulating coating is obvious, and it is easy to identify and distinguish the first tape from the insulating coating during image detection.

[0122] When the distance between the color of the insulating coating and the color of the second tape in the color space is equal to or greater than the fifth preset value, the difference between the color of the second tape and the color of the insulating coating is obvious, and it is easy to identify and distinguish the second tape from the insulating coating during image detection.

[0123] In some embodiments, the color of the insulating coating may be white (grayscale value is around 255), the first tape may be brown (brown R channel grayscale value is 80-90), the second tape may be blue (blue R channel grayscale value is 40-50), and the fourth and fifth preset values ​​may be 100 or 150, etc. Brown and blue are highly distinct from white, so the first tape and second tape on the insulating coating can be clearly detected.

[0124] In order to better distinguish the insulating coating from the background, the color distance between the background color on the side adjacent to the tab in the first surface image and the color of the insulating coating is equal to or greater than a sixth preset value, and the color distance between the background color on the side adjacent to the tab in the second surface image and the color of the insulating coating is equal to or greater than a sixth preset value.

[0125] Referring again to Figure 4, during the electrode sheet transmission process, camera 1# can photograph the first surface to obtain a first surface image, whereby the first surface image includes the first tape, and camera 2# can photograph the second surface to obtain a second surface image, whereby the second surface image includes the second tape.

[0126] A specific implementation of "the color distance between the background color on the side adjacent to the tab in the first surface image and the color of the insulating coating is equal to or greater than a sixth preset value" may be to place a background below the electrode sheet when capturing the first surface image, such as a transmission table, a roller, or an installed background plate. The background color on the side adjacent to the tab (i.e., the background color below the insulating coating) and the color of the first tape are set to two colors whose color distance is equal to or greater than a sixth preset value.

[0127] A specific way to achieve "the color distance between the background color on the side adjacent to the tab in the second surface image and the color of the insulating coating is equal to or greater than a sixth preset value" may be to place a background below the electrode sheet when capturing the second surface image, such as a transmission table, a roller, or an installed background plate. The background color on the side adjacent to the tab (i.e., the background color below the insulating coating) and the color of the second tape are set to two colors whose color distance is equal to or greater than a sixth preset value.

[0128] As a result, when the first surface image is identified and detected, the two boundaries of the insulating coating can be more accurately captured, and when the second surface image is identified and detected, the two boundaries of the insulating coating can be more accurately captured.

[0129] As shown in FIG. 8, the above step S20 specifically further includes:

[0130] S24: Based on the first surface image, it is determined whether the tab-proximal second end of the first tape is between the tab-proximal boundary of the insulating coating and the tab-away boundary of the insulating coating.

[0131] After obtaining a first surface image that can easily distinguish the first tape from the insulating coating, a conventional image identification algorithm or pixel comparison algorithm can be applied to the first surface image to obtain the tab-proximal boundary of the insulating coating, the tab-away boundary of the insulating coating, and the tab-proximal second end of the first tape. Therefore, based on the positional relationship between the two boundaries of the insulating coating and the second end of the first tape, it can be determined whether the tab-proximal second end of the first tape is between the tab-proximal boundary of the insulating coating and the tab-away boundary of the insulating coating.

[0132] S25: Based on the second surface image, determine whether the tab-proximal second end of the second tape is between the tab-proximal boundary of the insulating coating and the tab-away boundary of the insulating coating.

[0133] After obtaining a second surface image that can easily distinguish the second tape from the insulating coating, a conventional image identification algorithm or pixel comparison algorithm can be applied to the second surface image to obtain the tab-proximal boundary of the insulating coating, the tab-distant boundary of the insulating coating, and the tab-proximal second end of the second tape. Therefore, based on the positional relationship between the two boundaries of the insulating coating and the second end of the second tape, it can be determined whether the tab-proximal second end of the second tape is between the tab-proximal boundary of the insulating coating and the tab-distant boundary of the insulating coating.

[0134] S26: If the second end of the first tape close to the tab is between the boundary of the insulating coating close to the tab and the boundary of the insulating coating away from the tab, and the second end of the second tape close to the tab is between the boundary of the insulating coating close to the tab and the boundary of the insulating coating away from the tab, determine that the attachment of the first tape and the second tape is acceptable.

[0135] Again, as shown in Figure 7, the second end of the first tape and the second end of the second tape extend in the direction of the tab, exceeding boundary 1# of the insulating coating away from the tab, but not exceeding boundary 2# of the insulating coating close to the tab, indicating that the attachment of the first tape and the second tape is acceptable.

[0136] In this embodiment, the color distance between the color of the insulating coating and the color of the first tape is equal to or greater than a fourth preset value, thereby clearly distinguishing the color of the first tape from the color of the insulating coating, and thus making it easier to distinguish between the first tape and the insulating coating during image detection. The color distance between the color of the insulating coating and the color of the second tape is equal to or greater than a fifth preset value, thereby clearly distinguishing the color of the second tape from the color of the insulating coating, and thus making it easier to distinguish between the second tape and the insulating coating during image detection. On the other hand, by setting the color distance between the color of the insulating coating and the background color of the side adjacent to the tab in the first surface image to a sixth preset value or greater, and setting the color distance between the color of the insulating coating and the background color of the side adjacent to the tab in the second surface image to a sixth preset value or greater, the colors of the insulating coatings on the first and second surfaces are clearly distinguishable in the first and second surface images, respectively, thereby enabling more accurate detection of the two boundaries of the insulating coating when identifying and detecting the first surface image, and more accurate detection of the two boundaries of the insulating coating when identifying and detecting the second surface image. These two aspects effectively improve the accuracy of applied tape detection.

[0137] According to some embodiments of the present application, preferably, the sixth preset value is greater than the fourth preset value and / or the sixth preset value is greater than the fifth preset value.

[0138] As can be seen, the sixth preset value is used to limit the degree of distinction between the background color of the side adjacent to the tab in the first surface image and the color of the insulating coating, and between the background color of the side adjacent to the tab in the second surface image and the color of the insulating coating, the fourth preset value is used to limit the degree of distinction between the color of the first tape and the color of the insulating coating, and the fifth preset value is used to limit the degree of distinction between the color of the second tape and the color of the insulating coating.

[0139] Based on the fact that the higher the gradation threshold value, the higher the degree of distinction, the sixth preset value is set higher than the fourth preset value, so that the degree of distinction between the background color of the side adjacent to the tab in the first surface image and the color of the insulating coating is higher than the degree of distinction between the color of the first tape and the color of the insulating coating, thereby making it easier to accurately detect the two boundaries of the insulating coating when performing image detection on the first surface image and determining the second end of the first tape based on the two boundaries of the insulating coating, which is beneficial for improving tape detection accuracy.The sixth preset value is set higher than the fifth preset value, so that the degree of distinction between the background color of the side adjacent to the tab in the second surface image and the color of the insulating coating is higher than the degree of distinction between the color of the second tape and the color of the insulating coating, thereby making it easier to accurately detect the two boundaries of the insulating coating when performing image detection on the second surface image and determining the second end of the first tape based on the two boundaries of the insulating coating, which is beneficial for improving tape detection accuracy.

[0140] In this embodiment, by setting the magnitude relationship of the three gradation thresholds, the fourth preset value, the fifth preset value, and the sixth preset value, the insulating coating can be easily distinguished and detected from the background of the first surface image and from the background of the second surface image, which helps to improve the accuracy of tape detection.

[0141] According to some embodiments of the present application, preferably, the background color of the side of the first surface image adjacent to the tab is black, and / or the background color of the side of the second surface image adjacent to the tab is black.

[0142] For example, as shown in Figure 4 again, when capturing the first surface image, a roller can be placed under the second surface of the electrode sheet to carry the electrode sheet, while the roller can serve as the background for capturing the first surface image. The area where the edge of the electrode sheet on the side closest to the tab is projected onto the roller is the background color of the side closest to the tab in the first surface image, and the area where the edge of the electrode sheet on the side closest to the tab is projected onto the roller is set to black.

[0143] As can be seen, when capturing the first surface image, a background plate is placed below the second surface of the electrode sheet, and the area where the electrode sheet edge on the side closest to the tab is projected onto the background plate is the background color of the side closest to the tab in the first surface image, and the area where the electrode sheet edge on the side closest to the tab is projected onto the background plate is set to black.

[0144] Since the gradation value of black is near 0, it is clearly distinguishable from the color of the insulating coating on the electrode sheet (insulating coating is generally white), and therefore the two boundaries of the insulating coating can be clearly identified.

[0145] In this embodiment, the background color of the side closest to the tab in the first surface image is set to black, and the background color of the side closest to the tab in the second surface image is set to black, thereby clearly distinguishing the insulating coating on the electrode sheet from the background, allowing the two boundaries of the insulating coating to be clearly identified, which helps to improve the accuracy of detecting whether the tape has been applied properly.

[0146] According to some embodiments of the present application, there is provided a method for detecting tape attached to a surface of an electrode sheet, the detected electrode sheet having a first surface and a second surface, a first tape and a second tape attached to the first surface and the second surface, respectively, the first tape being brown and the second tape being blue, and a color distance between the brown and blue colors being greater than 40 (a third preset value).

[0147] The method for detecting tape attached to the surface of an electrode sheet is applied between the die strip dividing step and the winding step.

[0148] (1) As shown in FIG. 4, a first surface image is acquired using camera 1#, and a second surface image is acquired using camera 2#, where the first surface image includes an image of the first tape and the second surface image includes an image of the second tape, and the first tape and second tape are not shown in FIG. 4.

[0149] A black electrochemical coating material is applied to both the first and second surfaces of the electrode sheet, and a white insulating coating is provided between the coating border near the tab and the tab. For successful application, the first end of the first tape and the first end of the second tape should extend beyond the coating border on the electrode sheet away from the tab, and the second end of the first tape and the second end of the second tape should extend beyond the border of the insulating coating away from the tab and not beyond the border of the insulating coating near the tab.

[0150] Here, when camera 1# captures the first surface image, the background is a black-and-white roller, one end of which is black and the other end is white. The electrode sheet is transported along the black-and-white roller, and camera 1# captures an image of the electrode sheet segment on the black-and-white roller. The edge of the electrode sheet away from the tab falls in the white area on the black-and-white roller, and the edge of the electrode sheet closer to the tab falls in the black area on the black-and-white roller. Therefore, the first end of the first tape and the first end of the second tape are in the white area on the black-and-white roller. The color distance between white and brown is approximately 170 (greater than a first preset value), and the color distance between white and blue is approximately 200 (greater than a second preset value). Based on this, the first end of the brown first tape and the first end of the blue second tape are easily distinguishable against the white background. The second end of the first tape and the second end of the second tape fall on the white insulating coating, and the white insulating coating falls on the black area on the black and white roller, and the color distance between white and black is approximately 255 (greater than the sixth preset value), the color distance between white and brown is approximately 170 (greater than the fourth preset value), and the color distance between white and blue is approximately 200 (greater than the fifth preset value).Based on this, the white insulating coating is easy to distinguish and identify against the black background, and the second end of the first tape and the second end of the second tape are easy to distinguish and identify against the white background.

[0151] (2) Pixel values ​​are compared based on the first surface image to obtain the attachment status (shape and position) of the first tape, and similarly, pixel values ​​are compared based on the second surface image to obtain the attachment status (shape and position) of the second tape, and it can be determined whether the attachment of the first tape and the second tape is acceptable.

[0152] In this embodiment, the color distance between the background color on the side away from the tab in the first surface image and the color of the first tape is set to a first preset value or more, and the color distance between the background color on the side away from the tab in the second surface image and the color of the second tape is set to a second preset value or more, so that the first tape and the second tape are clearly different from their corresponding background colors. This makes it possible to detect and identify the shape and position of the first tape relative to the electrode sheet based on the first surface image, and to detect and identify the shape and position of the second tape relative to the electrode sheet based on the second surface image. This makes it possible to accurately determine whether the application of the first tape and the second tape is acceptable, further improving the safety of the battery.

[0153] Next, when the color distance between the color of the insulating coating and the color of the first tape is equal to or greater than a fourth preset value, the difference between the color of the first tape and the color of the insulating coating is obvious, making it easy to identify and distinguish between the first tape and the insulating coating during image detection; and when the distance between the color of the insulating coating and the color of the second tape is equal to or greater than a fifth preset value, the difference between the color of the second tape and the color of the insulating coating is obvious, making it easy to identify and distinguish between the second tape and the insulating coating during image detection.

[0154] Finally, by setting the color distance between the background color of the side closest to the tab in the first surface image and the color of the insulating coating to a sixth preset value or more, and by setting the color distance between the background color of the side closest to the tab in the second surface image and the color of the insulating coating to a sixth preset value or more, the colors of the insulating coatings on the first surface and the second surface are clearly visible in the first surface image and the second surface image, respectively, so that the two boundaries of the insulating coating can be more accurately identified when identifying and detecting the first surface image, and the two boundaries of the insulating coating can be more accurately identified when identifying and detecting the second surface image. The above three aspects can effectively improve the accuracy of adhesive tape detection.

[0155] According to some embodiments of the present application, as shown in FIG. 9, the present application further provides an electrode sheet surface-attached tape detection device 300, which includes an image acquisition module 301 and an attachment pass / fail determination module 302.

[0156] The image acquisition module 301 is used to acquire a first surface image and a second surface image, where the first surface image includes an image of the first tape, the second surface image includes an image of the second tape, and the color distance between the background color on the side away from the tab in the first surface image and the color of the first tape is equal to or greater than a first preset value, and the color distance between the background color on the side away from the tab in the second surface image and the color of the second tape is equal to or greater than a second preset value.

[0157] The attachment pass / fail determination module is used to determine whether the attachment of the first tape and the second tape is pass / fail based on the first surface image and the second surface image.

[0158] For details not mentioned in the embodiment corresponding to FIG. 9, the description of the embodiment of the electrode sheet-attached tape detection method can be referred to, and the description will be omitted here.

[0159] In this embodiment, the color distance between the background color on the side away from the tab in the first surface image and the color of the first tape is set to a first preset value or more, and the color distance between the background color on the side away from the tab in the second surface image and the color of the second tape is set to a second preset value or more, so that the first tape and the second tape are clearly different from their corresponding background colors. This makes it possible to detect and identify the shape and position of the first tape relative to the electrode sheet based on the first surface image, and to detect and identify the shape and position of the second tape relative to the electrode sheet based on the second surface image. This makes it possible to accurately determine whether the application of the first tape and the second tape is acceptable, further improving the safety of the battery.

[0160] According to some embodiments of the present application, as shown in FIG. 10 , the present application further provides an electrode sheet-attached tape detection device 400, in which the electrode sheet has a first surface and a second surface, and a first tape and a second tape are attached to the first surface and the second surface, respectively, at predetermined positions of the electrode sheet.

[0161] The electrode sheet-attached tape detection device 400 includes a first image acquisition device 401, a second image acquisition device 402, a processor 403, and a memory 404. Here, the first image acquisition device 401 is used to acquire a first surface image, the first surface image includes an image of the first tape, and a color distance between a background color on a side away from the tab in the first surface image and the color of the first tape is equal to or greater than a first preset value. The second image acquisition device 402 is used to acquire a second surface image, the second surface image includes an image of the second tape, and a color distance between a background color on a side away from the tab in the second surface image and the color of the second tape is equal to or greater than a second preset value.

[0162] The processor 403 is communicatively connected to the first image acquisition device 401 and the second image acquisition device 402, respectively, to acquire a first surface image and a second surface image. The memory 404 is communicatively connected to the processor 403, and the memory 404 stores instructions executable by the processor 403, which are executed by the processor 403, thereby enabling the processor 403 to perform the method for detecting tape attached to the surface of an electrode sheet according to an embodiment of the present application.

[0163] Here, memory 404 may include read-only memory and random access memory and provides instructions and data to the processor. A portion of memory 404 may further include non-volatile random access memory (NVRAM). Memory 404 stores operating instructions, executable modules, or data structures, or a subset or extension thereof.

[0164] The processor 403 may be an integrated circuit chip and has signal processing capabilities. In the implementation process, each step of the method for detecting tape attached to the surface of an electrode sheet in the embodiment of the present application can be completed by an integrated logic circuit in hardware or instructions in software form in the processor 403. The processor 403 may be a general-purpose processor, a digital signal processing (DSP), a microprocessor, or a microcontroller, and may further include an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The processor can realize or execute the method for detecting tape attached to the surface of an electrode sheet in the embodiment of the present application.

[0165] In addition, the implementation of each operation can further refer to the corresponding description of the embodiment of the electrode sheet application tape detection method, and the processor 403 can further be combined with other functional hardware to perform other operations in the embodiment of the electrode sheet application tape detection method.

[0166] According to some embodiments of the present application, the present application further provides an electrode sheet application tape machine, which includes the above-mentioned electrode sheet application tape detection device.

[0167] In the above embodiment, the electrode sheet-attached tape detection device can accurately detect whether the tape attached to the surface of the electrode sheet is acceptable.

[0168] As can be understood, when detecting the electrode sheet application tape, the electrode sheet application tape detection device is installed around the electrode sheet application tape machine or on the electrode sheet application tape machine itself, and is used in combination with the electrode sheet application tape machine, so that the electrode sheet application tape detection device can be applied to the electrode sheet application tape machine and provides the electrode sheet application tape machine with an application tape detection function, and so the electrode sheet application tape machine includes the function of the electrode sheet application tape detection device.

[0169] Finally, it should be noted that the above embodiments are merely for illustrating the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the above embodiments or equivalently replace some or all of the technical features therein. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and all of them should be included in the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, any of the technical features mentioned in the embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, and includes all technical solutions falling within the scope of the claims.

Claims

1. A method for detecting tape attached to the surface of an electrode sheet, comprising: the electrode sheet has a first surface and a second surface, and a first tape and a second tape are attached to the first surface and the second surface, respectively; The detection method includes: acquiring a first surface image and a second surface image, wherein the first surface image includes an image of the first tape, the second surface image includes an image of the second tape, a color distance between a background color on a side away from the tab in the first surface image and a color of the first tape is equal to or greater than a first preset value, and a color distance between a background color on a side away from the tab in the second surface image and a color of the second tape is equal to or greater than a second preset value; acquiring a shape and position of the first tape and a shape and position of the second tape based on the first surface image and the second surface image, and comparing the shapes and positions of the first tape and the second tape to determine whether the attachment of the first tape and the second tape is acceptable; A method for detecting tape attached to the surface of an electrode sheet, comprising:

2. 2. The detection method of claim 1, wherein the color distance between the color of the first tape and the color of the second tape is equal to or greater than a third preset value.

3. 3. The detection method according to claim 2, wherein the first preset value is greater than the third preset value, and the second preset value is greater than the third preset value.

4. The detection method according to any one of claims 1 to 3, characterized in that the background color of the side of the first surface image away from the tab is white, and / or the background color of the side of the second surface image away from the tab is white.

5. determining whether the attachment of the first tape and the second tape is acceptable based on the first surface image and the second surface image; obtaining a first distance vector from a first end of the first tape away from the tab to a coating boundary of the electrode sheet away from the tab based on the first surface image; obtaining a second distance vector from a first end of the second tape away from the tab to a coating boundary of the electrode sheet away from the tab based on the second surface image; and determining whether application of the first tape and the second tape is acceptable based on the magnitude and direction of the first distance vector and the second distance vector; The detection method according to any one of claims 1 to 4, comprising:

6. determining whether the attachment of the first tape and the second tape is acceptable based on the first distance vector and the second distance vector; 6. The detection method of claim 5, further comprising determining that the attachment of the first tape and the second tape is acceptable if the first distance vector is greater than 0 and the second distance vector is greater than 0, with a direction toward the tab being a positive direction.

7. determining whether the attachment of the first tape and the second tape is acceptable based on the first distance vector and the second distance vector; 6. The detection method of claim 5, further comprising determining that the attachment of the first tape and the second tape is acceptable if the absolute value of the difference between the first distance vector and the second distance vector is within a predetermined range.

8. an insulating coating is provided between a coating boundary close to the tab of the electrode sheet and the tab, a color distance between the color of the insulating coating and the color of the first tape is equal to or greater than a fourth preset value, a color distance between the color of the insulating coating and the color of the second tape is equal to or greater than a fifth preset value, a color distance between a background color on the side close to the tab in the first surface image and the color of the insulating coating is equal to or greater than a sixth preset value, and a color distance between a background color on the side close to the tab in the second surface image and the color of the insulating coating is equal to or greater than the sixth preset value; determining whether the attachment of the first tape and the second tape is acceptable based on the first surface image and the second surface image; determining, based on the first surface image, whether a tab-proximal second end of the first tape is between a tab-proximal boundary of the insulating coating and a tab-away boundary of the insulating coating; determining whether a tab-proximal second end of the second tape is between a tab-proximal boundary of the insulating coating and a tab-away boundary of the insulating coating based on the second surface image; and determining that the attachment of the first tape and the second tape is acceptable if the second end of the first tape that is close to the tab is between the boundary of the insulating coating that is close to the tab and the boundary of the insulating coating that is away from the tab, and if the second end of the second tape that is close to the tab is between the boundary of the insulating coating that is close to the tab and the boundary of the insulating coating that is away from the tab; The detection method of claim 1 further comprising:

9. the sixth preset value is greater than the fourth preset value; and / or The sixth preset value is greater than the fifth preset value. The detection method according to claim 8 .

10. The background color of the first surface image on the side closest to the tab is black, and / or The background color of the second surface image on the side adjacent to the tab is black. The detection method according to claim 8 or 9,

11. An electrode sheet surface attachment tape detection device, an image acquisition module for acquiring a first surface image and a second surface image, wherein the first surface image includes an image of a first tape, the second surface image includes an image of a second tape, a color distance between a background color on a side away from a tab in the first surface image and a color of the first tape is equal to or greater than a first preset value, and a color distance between a background color on a side away from a tab in the second surface image and a color of the second tape is equal to or greater than a second preset value; and an attachment pass / fail determination module for acquiring the shape and position of the first tape and the shape and position of the second tape based on the first surface image and the second surface image, and determining whether the attachment of the first tape and the second tape is pass / fail by comparing the shapes and positions of the first tape and the second tape.

12. An electrode sheet application tape detection device, the electrode sheet has a first surface and a second surface, and a first tape and a second tape are attached to the first surface and the second surface at predetermined positions of the electrode sheet, respectively; The electrode sheet-applied tape detection device is a first image capture device for capturing a first surface image, the first surface image including an image of the first tape, wherein a color distance between a background color on a side of the first surface image away from the tab and a color of the first tape is equal to or greater than a first preset value; a second image capture device for capturing a second surface image, the second surface image including an image of the second tape, wherein a color distance between a background color on a side of the second surface image away from the tab and a color of the second tape is equal to or greater than a second preset value; a processor communicatively coupled to the first image capture device and the second image capture device to capture the first surface image and the second surface image, respectively; a memory connected in communication with the processor, the memory storing instructions executable by the processor, the instructions being executable by the processor to cause the processor to perform the method of any one of claims 1 to 10; and An electrode sheet-attached tape detection device comprising:

13. A device for detecting tape attached to the surface of an electrode sheet according to claim 11, Electrode sheet tape application machine.

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