Methods, apparatus, systems, media and products for testing battery cell winding.

Abstract

This application discloses a method, apparatus, system, medium, and product for detecting battery cell winding, relating to the field of lithium battery manufacturing technology. Compared to images of the cathode sheet taken before it is wound onto the winding needle, the coverage of the anode sheet on the cathode sheet determined based on the images of the anode sheet and the cathode sheet taken before winding onto the winding needle cannot accurately reflect the actual coverage of the anode sheet on the cathode sheet after winding onto the winding needle, because the position of the cathode sheet may shift during the feeding process. In this solution, since the first image is taken after both the anode and cathode sheets have been fed and wound onto the winding needle, the coverage of the anode sheet on the cathode sheet in the first image can accurately reflect the coverage of the anode sheet on the cathode sheet on the winding needle. Thus, this embodiment can improve the detection accuracy and alleviate the problem of missing defective battery cells by determining the coverage of the anode sheet on the cathode sheet based on the first image.

Description

Technical Field

[0001] This application relates to the field of lithium battery production technology, and in particular to cell winding inspection methods, apparatus, systems, media and products. Background Technology

[0002] Batteries are indispensable energy storage devices in daily life and work. In the battery manufacturing process, the cathode plate, upper separator, anode plate, and lower separator are usually wound together to form the battery cell.

[0003] During the electrode winding process, the coverage of the cathode plate by the anode plate is crucial. If the anode plate does not adequately cover the cathode plate, problems such as short circuits and fires may occur, affecting the safety of the battery cell. Specifically, the coverage of the cathode plate by the anode plate means that after the anode and cathode plates are stacked and wound, the four sides of the anode plate must extend beyond the four sides of the active area of ​​the cathode plate. In other words, the anode plate must have a portion extending beyond the active area of ​​the cathode plate in both length and width directions.

[0004] However, the current cell winding inspection method is inaccurate, and there is a problem of missing defective cells. Summary of the Invention

[0005] The main objective of this application is to provide a method, apparatus, system, medium, and product for detecting battery cell winding, which can improve detection accuracy and alleviate the problem of missed detection of defective battery cells.

[0006] To achieve the above objectives, this application proposes a cell winding detection method, which includes: acquiring a first image, the first image being acquired after an anode sheet and a cathode sheet are wound onto a winding needle; determining first feature information and second feature information based on the first image, wherein the first feature information characterizes the position of the edge of the anode sheet, and the second feature information characterizes the position of the edge of the insulating region of the cathode sheet, the edge of the insulating region being the edge away from the active region of the cathode sheet, and the edge of the anode sheet being the edge close to the insulating region; and determining the coverage of the cathode sheet by the anode sheet based on the first feature information and the second feature information.

[0007] In this embodiment, a first image is acquired. Since the first image is obtained after the cathode and anode sheets are wound onto the winding needle, it includes the edges of the anode sheet and the insulating regions of the cathode sheet. The edges of the insulating regions are those furthest from the active regions of the cathode sheet, while the edges of the anode sheets are those closest to the insulating regions. Based on this first image, first and second feature information can be determined. The first feature information characterizes the position of the edge of the anode sheet, and the second feature information characterizes the position of the edge of the insulating region of the cathode sheet. Thus, based on the first and second feature information, the coverage of the cathode sheet by the anode sheet can be determined. Furthermore, compared to images of the cathode sheet taken before it is wound onto the winding needle, the position of the cathode sheet may shift during the feeding process. Therefore, the coverage of the anode sheet on the cathode sheet determined based on the images of the anode sheet and the cathode sheet taken before it is wound onto the winding needle cannot accurately reflect the actual coverage of the anode sheet on the cathode sheet after it is wound onto the winding needle. In this solution, since the first image is taken after both the anode and cathode sheets have been fed and wound onto the winding needle, the coverage of the anode sheet on the cathode sheet in the first image can accurately reflect the coverage of the anode sheet on the cathode sheet on the winding needle. Thus, this embodiment can improve the detection accuracy and alleviate the problem of missing defective battery cells by determining the coverage of the anode sheet on the cathode sheet based on the first image.

[0008] Since the infrared camera captures the first image after the cathode and anode sheets are wound onto the winding needle, meaning that the cathode and anode sheets have already been fed and wound onto the winding needle before the infrared camera takes the first image, the relative positions of the anode and cathode sheets in the first image are the same as the relative positions of the anode and cathode sheets on the winding needle, without any deviation. Thus, the coverage of the anode sheet on the cathode sheet determined based on the first image is more accurate, improving detection accuracy and avoiding the problem of missing defective battery cells.

[0009] In one embodiment, determining the coverage of the anode sheet over the cathode sheet based on the first feature information and the second feature information includes: determining a first distance based on the first feature information and the second feature information, where the first distance characterizes the distance between the edge of the anode sheet and the edge of the insulating region; and determining the coverage of the anode sheet over the cathode sheet based on the first distance. In this scheme, the coverage distance of the anode sheet over the cathode sheet is determined by determining the first distance, which characterizes the distance between the edge of the anode sheet and the edge of the insulating region.

[0010] In one embodiment, before determining the coverage of the anode sheet on the cathode sheet based on the first distance, the method further includes: obtaining the width of the insulating region on the first side of the cathode sheet and the width of the insulating region on the second side of the cathode sheet, wherein the first side and the second side are disposed opposite to each other; determining the coverage of the anode sheet on the cathode sheet based on the first distance includes: determining the coverage of the anode sheet on the first and second sides of the cathode sheet based on the first distance, the width of the insulating region on the first side of the cathode sheet, and the width of the insulating region on the second side of the cathode sheet. This solution provides how to further determine the coverage of the anode sheet on the first and second sides of the cathode sheet based on the first distance.

[0011] In one embodiment, determining the coverage of the anode sheet on the first surface of the cathode sheet based on the first distance and the width of the insulating region on the first surface of the cathode sheet includes: calculating the coverage distance of the anode sheet on the first surface of the cathode sheet based on the first distance and the width of the insulating region on the first surface of the cathode sheet; and determining the coverage of the anode sheet on the first surface of the cathode sheet based on the coverage distance of the anode sheet on the first surface of the cathode sheet and a preset coverage threshold range. This solution provides a method for determining the coverage of the anode sheet on the first surface of the cathode sheet based on the first distance and the width of the insulating region on the first surface of the cathode sheet.

[0012] In one embodiment, determining the coverage of the anode sheet on the second surface of the cathode sheet based on the first distance and the width of the insulating region on the second surface of the cathode sheet includes: calculating the coverage distance of the anode sheet on the second surface of the cathode sheet based on the first distance and the width of the insulating region on the second surface of the cathode sheet; and determining the coverage of the anode sheet on the second surface of the cathode sheet based on the coverage distance of the anode sheet on the second surface of the cathode sheet and a preset coverage threshold range. This solution provides a method for determining the coverage of the anode sheet on the second surface of the cathode sheet based on the first distance and the width of the insulating region on the second surface of the cathode sheet.

[0013] In one embodiment, acquiring the first image includes: acquiring the first image at preset time intervals, wherein the preset time interval is greater than or equal to the time it takes for the anode plate and the cathode plate to be wound around the winding needle once.

[0014] In this embodiment, the anode and cathode plates are wound on the winding needle at least once, and at least one first image is taken. In this way, the coverage of the cathode plate by the anode plate during the winding process can be continuously monitored, and abnormal coverage can be detected in time.

[0015] Furthermore, to achieve the above objectives, this application also proposes a cell winding detection device, comprising an acquisition module for acquiring a first image, which is acquired after the anode and cathode sheets are wound onto a winding needle; a processing module for determining first feature information and second feature information based on the first image, wherein the first feature information characterizes the position of the edge of the anode sheet, and the second feature information characterizes the position of the edge of the insulating region of the cathode sheet, wherein the edge of the insulating region is the edge away from the active region of the cathode sheet, and the edge of the anode sheet is the edge close to the insulating region; and further for determining the coverage of the cathode sheet by the anode sheet based on the first feature information and the second feature information.

[0016] Furthermore, to achieve the above objectives, this application also proposes a battery cell winding detection system, characterized in that the system includes: an imaging device for capturing a first image of an anode sheet and a cathode sheet wound onto a winding needle; a processor connected to the imaging device, the processor for determining first feature information and second feature information based on the first image, wherein the first feature information characterizes the position of the edge of the anode sheet, the second feature information characterizes the position of the edge of the insulating region of the cathode sheet, the edge of the insulating region is the edge away from the active region of the cathode sheet, and the edge of the anode sheet is the edge close to the insulating region; and is further configured to determine the coverage of the anode sheet on the cathode sheet based on the first feature information and the second feature information.

[0017] In one embodiment, the system further includes an infrared light source for providing infrared light with a wavelength greater than 1000 nanometers. The infrared light having a wavelength greater than 1000 nanometers ensures clear imaging by the infrared camera, thereby improving detection accuracy.

[0018] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the cell winding detection method described above.

[0019] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the cell winding detection method described above. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a battery cell winding detection device.

[0023] Figure 2 for Figure 1 Image A and image B were captured by the battery cell winding detection device shown.

[0024] Figure 3 This is a schematic diagram of the structure of the battery cell winding detection system provided in the embodiments of this application;

[0025] Figure 4 This is a schematic diagram of the first process of the cell winding detection method provided in the embodiments of this application;

[0026] Figure 5 This is a schematic diagram illustrating the first scenario of an image captured by the imaging device according to an embodiment of this application;

[0027] Figure 6 This is a schematic diagram illustrating a second scenario of an image captured by the imaging device according to an embodiment of this application;

[0028] Figure 7 This is a schematic diagram illustrating a third scenario of images captured by the imaging device in an embodiment of this application.

[0029] Figure 8 This is a schematic diagram illustrating a fourth scenario of images captured by the imaging device in an embodiment of this application.

[0030] Figure 9 This is a schematic diagram illustrating a fifth scenario of an image captured by the imaging device in an embodiment of this application.

[0031] Figure 10 This is a schematic diagram of the second process of the cell winding detection method provided in the embodiments of this application;

[0032] Figure 11 This is a schematic diagram of the third process of the cell winding detection method provided in the embodiments of this application;

[0033] Figure 12 This is a schematic diagram of the fourth process of the cell winding detection method provided in the embodiments of this application;

[0034] Figure 13 This is a schematic diagram of the fifth process of the cell winding detection method provided in the embodiments of this application;

[0035] Figure 14 A schematic diagram of side A and side B of the cathode sheet provided in the embodiments of this application;

[0036] Figure 15 This is a schematic diagram of the battery cell winding detection device provided in an embodiment of this application.

[0037] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0039] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0040] Batteries are indispensable energy storage devices in daily life and work. In the battery manufacturing process, the cathode plate, upper separator, anode plate, and lower separator are usually wound together to form the battery cell.

[0041] During the electrode winding process, the coverage of the anode plate over the cathode plate is crucial. If the anode plate does not adequately cover the cathode plate, problems such as short circuits and fires may occur, affecting the safety of the battery cell. Specifically, the coverage of the anode plate over the cathode plate means that after the anode and cathode plates are stacked and wound, the four edges of the anode plate must extend beyond the four edges of the active area on the cathode plate. In other words, the anode plate must extend beyond the active area of ​​the cathode plate in both length and width directions.

[0042] The detection method and apparatus mentioned in this embodiment are used to detect whether there is a portion in the width direction of the anode sheet that extends beyond the active area of ​​the cathode sheet. In conventional technology, holes are usually manually drilled on the anode sheet after winding to check the coverage of the cathode sheet by the anode sheet. However, this method is relatively manual, has high labor costs, and is also relatively inefficient.

[0043] Figure 1A detection device is provided, including a winding machine, an image acquisition device, and a controller. The winding machine includes a winding needle 20, which can wind a cathode sheet 11, an upper diaphragm 12, an anode sheet 13, and a lower diaphragm 14 into a single battery cell through multiple turns. The cross-section of the winding needle 20 may include, but is not limited to, a circle, an ellipse, and a hexagon. The image acquisition device includes a first camera 31 and a second camera 32. The first camera 31 is set at a first position S1 to capture an image A before the cathode sheet 11 is fed in, and the second camera 32 is set at a second position S2 to capture an image B after the anode sheet 13 is fed in. The controller can detect the coverage of the anode sheet 13 on the cathode sheet 11 based on the images A and B acquired by the image acquisition device. The wound battery cell may be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft.

[0044] It is worth noting that, since the diaphragm (including the upper diaphragm 12 and the lower diaphragm 14) has a porous structure, natural light can pass through the diaphragm, and the second camera 32 can capture images of the anode plate 13 through the pores of the lower diaphragm 14.

[0045] It is worth noting that in this embodiment, it is assumed that the upper diaphragm 12 and the lower diaphragm 14 are aligned horizontally.

[0046] Image A obtained by the first camera 31, such as... Figure 2 As shown in (a), image A includes a cathode plate 11 and an upper diaphragm 12 located below the cathode plate 11 and not obscured by it. The cathode plate 11 is designed with an active region 111 and an insulating region 112 located on one side of the active region 111. The active region 111 is the portion of the cathode aluminum foil current collector coated with active material, and the insulating region 112 is the portion of the cathode aluminum foil current collector coated with insulating material instead of active material. The insulating region 112 is typically located at the edge of the cathode plate 11 or in a specific area (such as near the tab). During cell winding or stacking assembly, the insulating region 112 prevents the cathode aluminum foil current collector from directly contacting the anode plate 13, thus preventing internal short circuits.

[0047] Image B obtained by the second camera 32, as shown in Figure B Figure 2 As shown in (b), image B includes a lower diaphragm 14, an anode plate 13 located below the lower diaphragm 14, and an unobstructed winding needle 20.

[0048] according to Figure 2 The images A and B shown illustrate how the coverage of the anode plate 13 over the cathode plate 11 is determined as follows:

[0049] First, sub-images within the preset first detection frame T1 and second detection frame T2 on image A are determined, and edge lines within the sub-images are identified. The sub-image in the first detection frame T1 includes three edge lines, which are the first edge line, the second edge line, and the third edge line from left to right. The distance X1 between the first edge line and the second edge line (X1 is the distance between the edge of the upper diaphragm 12 near the first side and the edge of the insulating region 112) is calculated, and the distance X2 between the first edge line and the third edge line (X2 is the distance between the edge of the upper diaphragm 12 near the first side and the edge of the active region 111) is calculated. The sub-image in the second detection frame T2 includes two edge lines, and the distance X3 between these two edge lines is calculated (X3 is the distance between the edge of the upper diaphragm 12 near the second side and the edge of the active region 111).

[0050] Next, the sub-images in the preset third detection frame T3 and fourth detection frame T4 on image B are determined, and the edge lines in the sub-images are determined. The third detection frame T3 includes two edge lines, and the distance X4 between these two edge lines is calculated (X4 is the distance between the edge of the lower diaphragm 14 near the first side and the edge of the anode plate 13). The fourth detection frame T4 includes two edge lines, and the distance X5 between these two edge lines is calculated (X5 is the distance between the edge of the lower diaphragm 14 near the second side and the edge of the anode plate 13).

[0051] Thus, the covering distance OH1 of the anode plate 13 near the first side to the cathode plate 11 is distance X2 minus distance X4, that is, OH1=X2-X4; the covering distance OH2 of the anode plate 13 near the second side to the cathode plate 11 is distance X3 minus distance X5, that is, OH2=X3-X5.

[0052] A preset threshold range is set from a first preset value Q1 to a second preset value Q2, where Q2 is greater than Q1, and both Q1 and Q2 are greater than 0. When the values ​​of OH1 and OH2 are both between Q1 and Q2, or equal to Q1 or Q2, it indicates that the anode plate 13 is properly covering the cathode plate 11; otherwise, it indicates that the anode plate 13 is improperly covering the cathode plate 11.

[0053] It is worth noting that in this embodiment, the first side is the side closer to the insulating area 112 (left side of the image), and the second side is the side farther away from the insulating area 112 (right side of the image).

[0054] Research has revealed that in the aforementioned detection method, image A is captured by the first camera 31 before the cathode sheet 11 is fed into the winding needle 20. When image A is captured before the head or tail of the cathode sheet 11 enters the winding needle 20, the head and tail of the cathode sheet 11 are free ends and are prone to positional shift under external force. As a result, the coverage of the anode sheet 13 on the cathode sheet 11 determined based on image A and image B cannot accurately reflect the actual coverage of the anode sheet 13 on the cathode sheet 11 wound onto the winding needle 20, leading to inaccurate detection results and the problem of missing defective battery cells.

[0055] To address this, this application proposes a cell winding detection method, which includes: acquiring a first image, which is obtained after the anode sheet and cathode sheet are wound onto a winding needle; determining first feature information and second feature information based on the first image, wherein the first feature information characterizes the position of the edge of the anode sheet, and the second feature information characterizes the position of the edge of the insulating region of the cathode sheet, the edge of the insulating region being the edge away from the active region of the cathode sheet, and the edge of the anode sheet being the edge close to the insulating region; and determining the coverage of the cathode sheet by the anode sheet based on the first feature information and the second feature information.

[0056] In this embodiment, a first image is acquired. Since the first image is obtained after the cathode and anode sheets are wound onto the winding needle, it includes the edges of the anode sheet and the insulating regions of the cathode sheet. The edges of the insulating regions are those furthest from the active regions of the cathode sheet, while the edges of the anode sheets are those closest to the insulating regions. Based on this first image, first and second feature information can be determined. The first feature information characterizes the position of the edge of the anode sheet, and the second feature information characterizes the position of the edge of the insulating region of the cathode sheet. Thus, based on the first and second feature information, the coverage of the cathode sheet by the anode sheet can be determined. Furthermore, compared to images of the cathode sheet taken before it is wound onto the winding needle, the position of the cathode sheet may shift during the feeding process. Therefore, the coverage of the anode sheet on the cathode sheet determined based on the images of the anode sheet and the cathode sheet taken before it is wound onto the winding needle cannot accurately reflect the actual coverage of the anode sheet on the cathode sheet after it is wound onto the winding needle. In this solution, since the first image is taken after both the anode and cathode sheets have been fed and wound onto the winding needle, the coverage of the anode sheet on the cathode sheet in the first image can accurately reflect the coverage of the anode sheet on the cathode sheet on the winding needle. Thus, this embodiment can improve the detection accuracy and alleviate the problem of missing defective battery cells by determining the coverage of the anode sheet on the cathode sheet based on the first image.

[0057] The cell winding detection method in this embodiment can be applied to a cell winding detection system, or a cell winding detection device. The cell winding detection device can be a processor, computing device, industrial control computer, etc. with image processing capabilities.

[0058] Figure 3 The diagram shown is a structural schematic of a battery cell winding detection system. The following section combines... Figure 3 as well as Figure 2 The structure of the anode plate 13 and the cathode plate 11 is explained in relation to the cell winding detection system.

[0059] The battery cell winding inspection system includes an imaging device 41 and a processor 42 connected to the imaging device 41.

[0060] Imaging device 41 is used to capture a first image after the anode plate 13 and cathode plate 11 are wound onto the winding needle 20.

[0061] After acquiring the first image from the imaging device 41, the processor 42 determines first feature information and second feature information based on the first image. The first feature information represents the position of the edge of the anode sheet 13, and the second feature information represents the position of the edge of the insulating region 112 of the cathode sheet 11. The edge of the insulating region 112 is the edge of the active region 111 away from the cathode sheet 11, and the edge of the anode sheet 13 is the edge close to the insulating region 112. The processor 42 is also used to determine the coverage of the anode sheet 13 on the cathode sheet 11 based on the first feature information and the second feature information.

[0062] It should be understood that the processor 42 of the battery cell winding detection system is capable of implementing the battery cell winding detection method in the embodiments of this application.

[0063] In this embodiment, since the first image is acquired by the imaging device 41 after the cathode sheet 11 and the anode sheet 13 are wound onto the winding needle 20, the first image includes the edge of the anode sheet 13 and the edge of the insulating region 112 of the cathode sheet 11. The edge of the insulating region 112 is the edge away from the active region 111 of the cathode sheet 11, and the edge of the anode sheet 13 is the edge close to the insulating region 112. Furthermore, the processor 42 can determine first feature information and second feature information based on the first image. The first feature information represents the position of the edge of the anode sheet 13, and the second feature information represents the position of the edge of the insulating region 112 of the cathode sheet 11. Thus, the processor 42 can determine the coverage of the cathode sheet 11 by the anode sheet 13 based on the first and second feature information.

[0064] Furthermore, compared to the image of the cathode sheet 11 taken before it is wound onto the winding needle 20, the position of the cathode sheet 11 may shift during the feeding process. Therefore, the coverage of the anode sheet 13 on the cathode sheet 11 determined based on the image of the anode sheet 13 and the image of the cathode sheet 11 taken before it is wound onto the winding needle 20 cannot accurately reflect the actual coverage of the anode sheet 13 on the cathode sheet 11 after it is wound onto the winding needle 20. In this solution, since the first image is taken by the imaging device 41 after both the anode sheet 13 and the cathode sheet 11 have been fed and wound onto the winding needle 20, the coverage of the anode sheet 13 on the cathode sheet 11 in the first image can accurately reflect the coverage of the anode sheet 13 on the cathode sheet 11 on the winding needle 20. Thus, the battery cell winding detection system of this embodiment can improve detection accuracy and alleviate the problem of missed detection of defective battery cells.

[0065] It has been verified that if adopted Figure 1 The detection device shown, because the coverage of the anode plate 13 and cathode plate 11 determined based on images A and B, cannot accurately reflect the actual coverage of the anode plate 13 on the cathode plate 11 wound onto the winding needle 20, with a maximum deviation of up to 0.8 mm. However, using the device in this embodiment… Figure 3 The detection system shown has a first image that is taken by the imaging device 41 after both the anode plate 13 and the cathode plate 11 have been fed and wound onto the winding needle 20. Therefore, the coverage of the anode plate 13 on the cathode plate 11 in the first image can accurately reflect the coverage of the anode plate 13 on the cathode plate 11 on the winding needle 20 without any deviation, and the detection error can be reduced to 0.2 mm.

[0066] The winding needle 20 can wind the cathode plate 11, the upper diaphragm 12, the anode plate 13 and the lower diaphragm 14 into a single battery cell by multiple turns. The anode plate 13 is located on the side of the cathode plate 11 away from the winding needle 20. In other words, the cathode plate 11 is closer to the winding needle 20 than the anode plate 13.

[0067] Imaging device 41 is positioned at a preset position on winding needle 20 and is used to receive the light reflected by anode sheet 13 and cathode sheet 11 on winding needle 20 after cathode sheet 11 and anode sheet 13 are wound onto winding needle 20 to obtain a first image. Processor 42 is used to determine the coverage of cathode sheet 11 by anode sheet 13 based on the first image.

[0068] The preset position can be set as needed, such as... Figure 3 The preset position shown can be on the right side of the winding needle 20 (S3), below the winding needle 20 (S4), or on the left side of the winding needle 20 (S5), as long as the anode plate 13 and the cathode plate 11 are both wound onto the winding needle 20 at that position. This embodiment does not impose any restrictions.

[0069] In one feasible implementation, the imaging device 41 is an infrared camera. This is because the wavelength range of infrared light (700 nm to 1 mm) is much larger than that of visible light (400 nm to 700 nm). The longer the wavelength, the stronger the light penetration ability, and therefore, it is less likely to be scattered or absorbed by the microstructure in the material (such as membrane pores, grain boundaries). The membrane is a porous polymer film with a pore size usually between 0.1 μm and 1 μm. The long wavelength of infrared light allows it to bypass the edge of the pores (similar to diffraction), while visible light is easily scattered or blocked because its wavelength is close to the pore size (such as blue light wavelength ≈ 450 nm). The cathode plate 11 has specific reflection or emission characteristics in the infrared band, which facilitates imaging. Therefore, by using an infrared camera to capture images, both the anode plate 13 and the portion of the cathode plate 11 not blocked by the anode plate 13 can be captured simultaneously.

[0070] It is feasible that the distance between the infrared camera and the winding needle 20 must meet the specifications of the infrared camera (the standard distance is 270mm).

[0071] In one feasible implementation, when the imaging device 41 is an infrared camera, the imaging device 41 includes a camera body 411 and an infrared filter 412 disposed on the camera body 411. The infrared filter 412 is used to filter visible light and transmit infrared light. The camera body 411 is used to receive infrared light reflected by the anode plate 13 and the cathode plate 11 on the winding needle 20 to form a first image.

[0072] The infrared filter 412 can filter out ordinary visible light (wavelength ≤ 780nm) and only transmit infrared light (wavelength > 780nm). The camera body 411 receives infrared light from the natural light reflected by the anode plate 13 and cathode plate 11 on the winding needle 20 to form a first image.

[0073] Since natural light contains a relatively small amount of infrared light, the initial image formed solely by the reflection of infrared light from natural light may be unclear, affecting the accuracy of the detection results. To address this, in one feasible implementation, the battery cell winding detection system further includes an infrared light source to provide infrared light.

[0074] In this embodiment, the infrared light source 43 is aligned with the winding needle 20, thereby providing infrared light to the anode plate 13 and cathode plate 11 on the winding needle 20. This increases the infrared light component reflected by the anode plate 13 and cathode plate 11 on the winding needle 20, providing a supporting light source for the infrared camera to collect light and improving the imaging clarity of the first image.

[0075] It is achievable that by adjusting the brightness and angle of the infrared light source 43, the brightness of the infrared camera imaging can be kept between 50% and 80%, thus avoiding the first image captured by the infrared camera being too bright or too dark and affecting the accuracy of the detection results.

[0076] It is feasible that the infrared light provided by the infrared light source 43 has a wavelength greater than 1000 nanometers to ensure that the infrared light can penetrate the upper diaphragm 12 and the lower diaphragm 14 and be reflected by the cathode plate 11. Specifically, the wavelength of the infrared light provided by the infrared light source 43 can be 1100nm, 1200nm, 1300nm, etc., and can be selected as needed.

[0077] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the battery cell winding detection system of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0078] The cell winding detection method in the embodiments of this application will be described in detail below. Figure 4 This is a flowchart illustrating the first embodiment of the battery cell winding detection method of this application.

[0079] In this embodiment, the cell winding detection method includes steps S10~S30:

[0080] Step S10: Obtain the first image, which is obtained after the anode and cathode plates are wound onto the winding needle.

[0081] The first image was obtained after the anode and cathode plates were wound onto a winding needle. The obtained first image includes the edge of the anode plate and the edge of the insulating region of the cathode plate, wherein the edge of the insulating region is the edge away from the active region of the cathode plate, and the edge of the anode plate is the edge close to the insulating region.

[0082] It is feasible to have an imaging device capture a first image, which is then sent to a cell winding detection device for processing. The imaging device is aligned with the first side of the winding needle, which is the side closest to the insulating area of ​​the cathode sheet. Thus, the first image captured by the imaging device does not include a complete image of the anode sheet in the width direction, but rather includes the portions of the anode and cathode sheets closest to the first side of the winding needle.

[0083] This is achievable. The imaging device captures a raw image, which includes a complete image of the anode sheet in the width direction. Then, an image block within a first preset detection frame is acquired from the raw image to obtain a first image. The first preset detection frame can be pre-set.

[0084] It should be understood that the imaging device in this embodiment does not employ... Figure 1The camera in the device shown is not the only one capable of capturing images of the cathode portion below the upper diaphragm that is not obscured by the anode sheet; that is, the imaging device can penetrate both diaphragms. In this embodiment, the imaging device can be an infrared camera because (1) infrared light has a longer wavelength and stronger penetrating power; (2) the diaphragm material has low absorption of infrared light and the diaphragm has high transmittance in the infrared band; and (3) the cathode sheet has specific reflection or emission characteristics in the infrared band, which facilitates imaging. Therefore, an infrared camera can capture images of both the anode sheet and the cathode portion not obscured by the anode sheet in one shot.

[0085] It is worth noting that other imaging devices capable of penetrating both diaphragms and capturing images of the cathode portion below the upper diaphragm that is not obscured by the anode sheet are also within the scope of protection of this embodiment.

[0086] Step S20: Determine first feature information and second feature information based on the first image. The first feature information represents the position of the edge of the anode plate, and the second feature information represents the position of the edge of the insulating area of ​​the cathode plate.

[0087] After acquiring the first image, the first image is processed to extract the first feature information and the second feature information in the first image. The first feature information represents the position of the edge of the anode plate, and the second feature information represents the position of the edge of the insulating region of the cathode plate. The edge of the insulating region is the edge away from the active region of the cathode plate, and the edge of the anode plate is the edge close to the insulating region.

[0088] It is possible that the first feature information can be the two-dimensional coordinates (a1, b1) of a point on the edge of the anode plate, and the second feature information can be the two-dimensional coordinates (a2, b2) of a point on the edge of the insulating region of the cathode plate. Alternatively, the first feature information can be the abscissa a1 of a point on the edge of the anode plate, and the second feature information can be the abscissa a2 of a point on the edge of the insulating region of the cathode plate.

[0089] Optionally, since the width of the edge of the anode plate or insulating region is much smaller than the distance between the edge of the anode plate and the edge of the insulating region, any point on the edge of the anode plate can be selected. Alternatively, a point at a specific location can be selected, such as the midpoint of the edge of the anode plate in the lateral direction, or the point on the edge of the anode plate that is closest in the lateral direction to the edge of the insulating region of the cathode plate.

[0090] Step S30: Determine the coverage of the anode plate on the cathode plate based on the first feature information and the second feature information.

[0091] Assuming the first feature information is (a1, b1) and the second feature information is (a2, b2), the distance between the edge of the anode plate and the edge of the insulating area can be calculated as a1-a2. Based on the distance a1-a2, the coverage of the cathode plate by the anode plate can be determined.

[0092] The aforementioned coverage details may include: coverage results (coverage meets or does not meet requirements), actual coverage distance, and coverage deviation (the difference between the actual coverage distance and the expected coverage distance).

[0093] In this embodiment, first feature information and second feature information are determined based on the first image. The first feature information represents the position of the edge of the anode sheet, and the second feature information represents the position of the edge of the insulating area of ​​the cathode sheet. Thus, the coverage of the anode sheet over the cathode sheet can be determined based on the first and second feature information. Furthermore, compared to images of the cathode sheet taken before it is wound onto the winding needle, the coverage of the anode sheet over the cathode sheet determined based on the images of the anode sheet and the images of the cathode sheet taken before it is wound onto the winding needle cannot accurately reflect the actual coverage of the anode sheet over the cathode sheet on the winding needle. In this solution, since the first image is taken after both the anode and cathode sheets have been fed and wound onto the winding needle, the coverage of the anode sheet over the cathode sheet in the first image can accurately reflect the coverage of the anode sheet over the cathode sheet on the winding needle. Therefore, this embodiment, by determining the coverage of the anode sheet over the cathode sheet based on the first image, can improve detection accuracy and alleviate the problem of missed detection of defective battery cells.

[0094] In one feasible implementation, acquiring the first image includes: acquiring the first image at preset time intervals, wherein the preset time interval is greater than or equal to the time it takes for the anode and cathode plates to be wound around the winding needle once.

[0095] During the winding process from the start of feeding the anode and cathode sheets to the end of feeding, at least one first image is acquired at preset time intervals. That is, at least one first image is acquired every time the anode and cathode sheets are wound on the winding needle at least once. In this way, the coverage of the anode sheet on the cathode sheet during the winding process can be continuously monitored, and abnormal coverage can be detected in a timely manner.

[0096] In one feasible implementation, after the imaging device is fixed in position, and assuming the anode plate properly covers the cathode plate, the imaging area is as follows: Figure 5 The area within the dashed box shown in P1. That is, the imaging device did not capture the edge of the lower diaphragm 14. The leftmost edge line in the first image captured by the imaging device is the edge of the insulating area 112 of the cathode plate 11, and the rightmost edge line is the edge of the anode plate 13.

[0097] In practical applications, the raw images captured by imaging devices can include the following five situations. (1) Such as Figure 5As shown, the anode plate 13 partially obscures the insulating area 112 of the cathode plate 11. The original image includes not only the edge of the anode plate 13, but also the edge of the insulating area 112 of the cathode plate 11 that is not obscured by the anode plate 13; (2) as Figure 6 As shown, the anode plate 13 completely blocks the insulating area 112 of the cathode plate 11, and the original image only includes the edge of the anode plate 13; (3) as Figure 7 As shown, the edge of the anode plate 13 overlaps with the edge of the insulating region 112 of the cathode plate 11 near the active region 111. The original image includes not only the edge of the anode plate 13, but also the edge of the insulating region 112 of the cathode plate 11 that is not covered by the anode plate 13; (4) as Figure 8 As shown, the anode plate 13 exposes part of the active area 111 of the cathode plate 11. The original image includes not only the edge of the anode plate 13, but also the edges on both sides of the insulating area 112 of the cathode plate 11. (5) As Figure 9 As shown, the anode plate 13 is removed from the lens area of ​​the imaging device 41, and the original image includes the edges on both sides of the insulating area 112 of the cathode plate 11.

[0098] Before executing step S20, the first image is obtained by filtering the original images captured by the imaging device based on the number of edge lines. In this embodiment, original images with fewer than a first preset number of edge lines are filtered out, and original images with more than or equal to the first preset number of edge lines are determined as the first image.

[0099] In this embodiment, the first preset number is 2. Therefore, among the original images of the above 5 cases, since the number of edge lines in the original image of case (2) is 1, the original image of case (2) will be filtered out, and the remaining 4 original images will be used as the first image. In this embodiment, it is assumed that in the remaining 4 original images, the edge of the insulating area 112 in the first image is located at the leftmost position of the first image, and the edge of the anode plate 13 is located at the rightmost position of the first image.

[0100] Based on this, such as Figure 10 As shown, the first feature information and the second feature information in the first image can be determined through the following steps S2011 to S2012.

[0101] Step S2011: Determine the edge lines in the first image.

[0102] The first image can be a color image or a grayscale image. If the first image is a grayscale image, edge detection algorithms can be directly used to determine the edge lines in the grayscale image. Examples of edge detection algorithms include Canny edge detection, Sobel edge detection, and Laplacian edge detection. If the first image is a color image, it should first be converted to a grayscale image before using an edge detection algorithm to determine the edge lines in the grayscale image.

[0103] Thus, using edge detection algorithms, at least two edge lines can be identified from the first image.

[0104] Step S2012: Determine the first feature information based on the rightmost edge line in the first image, and determine the second feature information based on the leftmost edge line in the first image.

[0105] Since the position of the imaging device capturing the first image is fixed, ideally, the rightmost edge line in the image captured by the imaging device should be the edge of the anode plate 13, and the leftmost edge line should be the edge of the insulating area 112 of the cathode plate 11. Therefore, in this embodiment, it is initially assumed that the rightmost edge line in the first image represents the edge of the anode plate 13, and the leftmost edge line in the first image represents the edge of the insulating area 112 of the cathode plate 11. In this way, the first feature information can be determined based on the rightmost edge line in the first image, and the second feature information can be determined based on the leftmost edge line in the first image.

[0106] It is possible that the first feature information can be the two-dimensional coordinates (a1, b1) of a point on the edge of the anode plate 13, and the second feature information can be the two-dimensional coordinates (a2, b2) of a point on the edge of the insulating region 112 of the cathode plate 11. Alternatively, the first feature information can be the abscissa a1 of a point on the edge of the anode plate 13, and the second feature information can be the abscissa a2 of a point on the edge of the insulating region 112 of the cathode plate 11.

[0107] Optionally, since the width of the edge of the anode plate 13 or the insulating region 112 is much smaller than the distance between the edge of the anode plate 13 and the edge of the insulating region 112, any point on the edge of the anode plate 13 can be selected. Alternatively, a point at a specific location can be selected, for example, the midpoint of the edge of the anode plate 13 in the lateral direction, or the point on the edge of the anode plate 13 that is closest in the lateral direction to the edge of the insulating region 112 of the cathode plate 11.

[0108] In another feasible implementation, after the imaging device is fixed in position, and assuming the anode plate properly covers the cathode plate, the imaging area of ​​the imaging device is as follows: Figure 5 The area within the dashed box shown in P2. That is, the imaging device captures the edge of the lower diaphragm 14 within it. The leftmost edge line in the first image is the edge of the lower diaphragm 14, which is the edge near the insulating region 112; the second edge line from the left is the edge of the insulating region 112 of the cathode plate 11; and the rightmost edge line is the edge of the anode plate 13.

[0109] In practical applications, the original images captured by imaging devices include the following five situations: (1) such as Figure 5As shown, the anode plate 13 partially blocks the insulating area 112 of the cathode plate 11. The image captured by the imaging device 41 includes not only the edge of the lower diaphragm 14 and the edge of the anode plate 13, but also the edge of the insulating area 112 of the cathode plate 11 that is not blocked by the anode plate 13; (2) as Figure 6 As shown, the anode plate 13 completely blocks the insulating area 112 of the cathode plate 11, and the image captured by the imaging device 41 only includes the edge of the lower diaphragm 14 and the edge of the anode plate 13; (3) as Figure 7 As shown, the edge of the anode plate 13 overlaps with the edge of the insulating region 112 near the active region 111. The image captured by the imaging device 41 includes not only the edge of the lower diaphragm 14 and the edge of the anode plate 13, but also the edge of the insulating region 112 of the cathode plate 11 that is not covered by the anode plate 13; (4) as Figure 8 As shown, the anode plate 13 exposes part of the active area 111 of the cathode plate 11. The image captured by the imaging device 41 includes not only the edge of the lower diaphragm 14 and the edge of the anode plate 13, but also the edges on both sides of the insulating area 112 of the cathode plate 11. (5) As Figure 9 As shown, the anode plate 13 is moved out of the lens area of ​​the imaging device 41, and the image captured by the imaging device 41 includes the edge of the lower diaphragm 14 and the edges on both sides of the insulating area 112 of the cathode plate 11.

[0110] Before executing step S20, the original images captured by the imaging device are first filtered according to the number of edge lines in the original images to obtain the first image. In this embodiment, original images with the number of edge lines less than a second preset number are filtered out, and original images with the number of edge lines greater than or equal to the second preset number are determined as the first image.

[0111] In this embodiment, the second preset number is 3. Therefore, among the above 5 original images, since the number of edge lines in the (2) original image is 2, the (2) original image will be filtered out, and the remaining 4 original images will be used as the first image. In this embodiment, it is assumed that among the remaining 4 original images, the edge of the diaphragm in the first image is located at the leftmost edge of the first image, the edge of the insulating area 112 of the cathode plate 11 is located at the second line from the left, and the edge of the anode plate 13 is located at the rightmost edge of the first image.

[0112] Based on this, such as Figure 11 As shown, the first feature information and the second feature information in the first image can be determined through the following steps S2021 to S2022.

[0113] Step S20 above includes steps S2021 to S2022.

[0114] Step S2021: Determine the edge lines in the first image.

[0115] In this embodiment, step S2021 is largely the same as step S2011 above. To avoid repetition, it will not be described again in this embodiment.

[0116] Step S2022: Determine the first feature information based on the rightmost edge line in the first image, and determine the second feature information based on the second edge line on the left in the first image.

[0117] Since the position of the imaging device capturing the first image is fixed, ideally, the second edge line from the left in the image captured by the imaging device should be the edge of the insulating area 112 of the cathode plate 11, and the rightmost edge line should be the edge of the anode plate 13. Therefore, in this embodiment, it is initially assumed that the rightmost edge line in the first image represents the edge of the anode plate 13, and the second edge line from the left in the first image represents the edge of the insulating area 112 of the cathode plate 11. Thus, the first feature information is determined based on the rightmost edge line in the first image, and the second feature information is determined based on the second edge line from the left in the first image.

[0118] In another feasible implementation, after the imaging device is fixed in position, and assuming the anode sheet 13 properly covers the cathode sheet 11, the first image captured by the imaging device does not include the area of ​​the winding needle 20. Since the grayscale value of the winding needle 20 < the grayscale value of the anode sheet 13 < the grayscale value of the active area 111 of the cathode sheet 11 < the grayscale value of the insulating area 112 of the cathode sheet 11 < the grayscale value of the diaphragm, it can be determined that when the first image captured by the imaging device 41 does not include the area of ​​the winding needle 20, the area with the highest grayscale value in the first image represents the diaphragm, and the area with the lowest grayscale value represents the anode sheet 13.

[0119] Based on this, such as Figure 12 As shown, the first feature information and the second feature information in the first image can be determined through the following steps S2031 to S2032.

[0120] Step S2031: Determine the region with the highest gray value in the first image as the region where the diaphragm is located, and determine the region with the lowest gray value in the first image as the region where the anode sheet is located.

[0121] The first image can be a color image or a grayscale image. If the first image is a grayscale image, the regions are divided according to the pixel grayscale values ​​of the first image, thereby determining the region with the largest grayscale value and the region with the smallest grayscale value. The region with the largest grayscale value in the first image is determined as the region where the diaphragm is located, and the region with the smallest grayscale value in the first image is determined as the region where the anode plate 13 is located.

[0122] Step S2032: The first feature information is determined based on the edge line closest to the anode plate area between the diaphragm area and the anode plate area, and the second feature information is determined based on the edge line closest to the diaphragm area between the diaphragm area and the anode plate area.

[0123] After determining the region where the diaphragm is located and the region where the anode plate 13 is located in the first image, the edge lines between the region where the diaphragm is located and the region where the anode plate 13 is located are determined. The edge line between the two regions that is closest to the region where the anode plate 13 is located is determined as the edge line of the anode plate 13. The edge line between the two regions that is closest to the region where the diaphragm is located is determined as the edge line of the insulating region 112 of the cathode plate 11.

[0124] It is worth noting that when the number of edge lines between the two regions is 1, it can be directly determined that the anode plate 13 is abnormally covering the cathode plate 11, which is not within the scope of discussion in this embodiment.

[0125] In one feasible implementation, such as Figure 13 As shown, the above step S30 includes step S301 and step S302.

[0126] Step S301: Determine the first distance based on the first feature information and the second feature information.

[0127] In this embodiment, the first distance characterizes the spacing between the edge of the anode plate 13 and the edge of the insulating region 112. Assuming the position of the edge of the anode plate 13, i.e., the first feature information, is represented as (a1, b1); and the position of the edge of the insulating region 112, i.e., the second feature information, is represented as (a2, b2), if the first distance is represented by Y1, then the first distance Y1 = .

[0128] Step S302: Determine the coverage of the anode plate on the cathode plate based on the first distance.

[0129] Ideally, the width of the anode plate 13 is approximately the same as the width of the cathode plate 11. After the cathode plate 11 is wound around the anode plate 13, the anode plate 13 should cover the active area 111 of the cathode plate 11, and the distances between the left and right sides of the anode plate 13 and the left and right sides of the active area 111 should be approximately the same. Therefore, it can be assumed that the distance between the left edge of the anode plate 13 and the left edge of the active area 111 is the coverage distance OH3, and the distance between the right edge of the anode plate 13 and the right edge of the active area 111 is the coverage distance OH4. When both OH3 and OH4 are within the preset range, it can be determined that the coverage of the cathode plate 11 by the anode plate 13 is normal; otherwise, the coverage of the cathode plate 11 by the anode plate 13 is abnormal. Since the coverage distances OH3 and OH4 are approximately the same under ideal conditions, it can be determined whether the coverage distance OH4 is also within the preset range by determining whether the coverage distance OH3 is within the preset range. If the coating distance OH3 is within the preset range, then the coating distance OH4 is also within the preset range; if the coating distance OH3 is not within the preset range, then the coating distance OH4 is also not within the preset range.

[0130] It is feasible to set a preset range of a first preset value Q1 to a second preset value Q2, where Q2 is greater than Q1 and both Q1 and Q2 are greater than 0.

[0131] It is feasible that, since the width of the insulating region 112 of the cathode plate 11 is a fixed value, by measuring the width of the insulating region 112 of the cathode plate 11, the covering distance OH3 is determined based on the width of the insulating region 112 of the cathode plate 11 and the first distance, and then the covering condition of the anode plate 13 on the cathode plate 11 is determined based on the covering distance OH3.

[0132] In one feasible implementation, before step S302, the method further includes: obtaining the width of the insulating region 112 on the first side of the cathode sheet 11 and the width of the insulating region 112 on the second side of the cathode sheet 11, wherein the first side and the second side are arranged opposite to each other.

[0133] See Figure 14 The cathode sheet 11 includes an A side and a B side facing away from each other. The width of the insulating area 112 on the A side and the B side may be different due to coating errors. Before the cathode sheet 11 enters the winding needle 20, the width W1 of the insulating area 112 on the A side of the cathode sheet 11 and the width W2 of the insulating area 112 on the B side of the cathode sheet 11 are obtained in advance.

[0134] In this embodiment, the first surface can be surface A and the second surface can be surface B; or, the first surface can be surface B and the second surface can be surface A.

[0135] Step S302 includes: determining the coverage of the first and second surfaces of the cathode plate 11 by the anode plate 13 based on the first distance, the width of the insulating area 112 on the first surface of the cathode plate 11, and the width of the insulating area 112 on the second surface of the cathode plate 11.

[0136] In this embodiment, the coverage of the anode plate 13 on the A and B surfaces of the cathode plate 11 can be determined based on the first distance, the width W1 of the insulating area 112 on the A surface of the cathode plate 11, and the width W2 of the insulating area 112 on the B surface of the cathode plate 11.

[0137] In one feasible implementation, determining the coverage of the first and second surfaces of the cathode plate 11 by the anode plate 13 based on the first distance, the width of the insulating area 112 on the first surface of the cathode plate 11, and the width of the insulating area 112 on the second surface of the cathode plate 11 includes: determining the coverage of the first surface of the cathode plate 11 by the anode plate 13 based on the first distance and the width of the insulating area 112 on the first surface of the cathode plate 11; and determining the coverage of the second surface of the cathode plate 11 by the anode plate 13 based on the first distance and the width of the insulating area 112 on the second surface of the cathode plate 11.

[0138] In one feasible implementation, determining the coverage of the first surface of the cathode plate 11 by the anode plate 13 based on the first distance and the width of the insulating area 112 on the first surface of the cathode plate 11 includes: calculating the coverage distance of the anode plate 13 on the first surface of the cathode plate 11 based on the first distance and the width of the insulating area 112 on the first surface of the cathode plate 11; and determining the coverage of the first surface of the cathode plate 11 by the anode plate 13 based on the coverage distance of the anode plate 13 on the first surface of the cathode plate 11 and a preset coverage threshold range.

[0139] The following description uses the first surface of the cathode plate 11 as surface A and the second surface as surface B as an example to illustrate this embodiment:

[0140] By subtracting the first distance Y1 from the width W1 of the insulating area 112 of the first surface (A surface) of the cathode plate 11, the covering distance OH3 of the anode plate 13 on the first surface (A surface) of the cathode plate 11 can be obtained, where OH3 = W1 - Y1.

[0141] If the coating distance OH3 is within the preset coating threshold range, then the first coating of the anode plate 13 to the cathode plate 11 is determined to be normal; otherwise, the first coating of the anode plate 13 to the cathode plate 11 is determined to be abnormal. Assuming the preset coating threshold range is a first preset value Q1 to a second preset value Q2, then if OH3 is between Q1 and Q2, or equal to Q1 or Q2, the first coating of the anode plate 13 to the cathode plate 11 is determined to be normal.

[0142] In one feasible implementation, determining the coverage of the second surface of the cathode sheet 11 by the anode sheet 13 based on the first distance and the width of the insulating area 112 on the second surface of the cathode sheet 11 includes: calculating the coverage distance of the anode sheet 13 on the second surface of the cathode sheet 11 based on the first distance and the width of the insulating area 112 on the second surface of the cathode sheet 11; and determining the coverage of the second surface of the cathode sheet 11 by the anode sheet 13 based on the coverage distance of the anode sheet 13 on the second surface of the cathode sheet 11 and a preset coverage threshold range.

[0143] The following description uses the first surface of the cathode plate 11 as surface A and the second surface as surface B as an example to illustrate this embodiment:

[0144] By subtracting the first distance Y1 from the width W2 of the insulating area 112 of the second surface (B surface) of the cathode plate 11, the covering distance OH4 of the anode plate 13 on the second surface (B surface) of the cathode plate 11 can be obtained, where OH4 = W2 - Y1.

[0145] If the coating distance OH4 is within the preset coating threshold range, then the second coating of the anode plate 13 to the cathode plate 11 is determined to be normal; otherwise, the second coating of the anode plate 13 to the cathode plate 11 is determined to be abnormal. Assuming the preset coating threshold range is a first preset value Q1 to a second preset value Q2, then if OH4 is between Q1 and Q2, or equal to Q1 or Q2, the second coating of the anode plate 13 to the cathode plate 11 is determined to be normal.

[0146] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the cell winding detection method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0147] Based on the above, this application provides a battery cell winding detection device that can implement the battery cell winding detection method in any of the above embodiments. For example... Figure 15 As shown, the device includes:

[0148] The acquisition module 10 is used to acquire a first image, which is obtained after the anode and cathode plates are wound onto the winding needle.

[0149] The processing module 20 is used to determine first feature information and second feature information based on the first image, wherein the first feature information represents the position of the edge of the anode sheet, and the second feature information represents the position of the edge of the insulating region of the cathode sheet, wherein the edge of the insulating region is the edge away from the active region of the cathode sheet, and the edge of the anode sheet is the edge close to the insulating region.

[0150] The processing module 20 is also used to determine the coverage of the anode sheet on the cathode sheet based on the first feature information and the second feature information.

[0151] The beneficial effects of the battery cell winding detection device provided in this application are the same as those of the battery cell winding detection method provided in the above embodiments, and other technical features in the battery cell winding detection device are the same as those disclosed in the above embodiments, and will not be repeated here.

[0152] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0153] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, which are used to execute the cell winding detection method in the above embodiments.

[0154] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0155] The aforementioned computer-readable storage medium carries one or more programs, which can be written in one or more programming languages ​​or combinations thereof to perform the operations of this application. These programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—and conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0156] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0157] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0158] The readable storage medium provided in this application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-described cell winding detection method. The beneficial effects of the computer-readable storage medium provided in this application are the same as those of the cell winding detection method provided in the above embodiments, and will not be repeated here.

[0159] This application also provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the cell winding detection method described above. The beneficial effects of the computer program product provided in this application are the same as those of the cell winding detection method provided in the above embodiments, and will not be repeated here.

[0160] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for detecting battery cell winding, characterized in that, The method includes: A first image is acquired after the anode and cathode plates are wound onto a winding needle; First feature information and second feature information are determined based on the first image, wherein the first feature information characterizes the position of the edge of the anode plate, and the second feature information characterizes the position of the edge of the insulating region of the cathode plate, wherein the edge of the insulating region is the edge away from the active region of the cathode plate, and the edge of the anode plate is the edge close to the insulating region; A first distance is determined based on the first feature information and the second feature information, wherein the first distance characterizes the distance between the edge of the anode plate and the edge of the insulating region; The width of the insulating region on the first side of the cathode sheet and the width of the insulating region on the second side of the cathode sheet are obtained, wherein the first side and the second side are arranged opposite to each other; Based on the first distance, the width of the insulating area on the first side of the cathode sheet, and the width of the insulating area on the second side of the cathode sheet, the coverage of the anode sheet on the first and second sides of the cathode sheet is determined.

2. The cell winding detection method as described in claim 1, characterized in that, The step of determining the coverage of the anode sheet over the first and second surfaces of the cathode sheet based on the first distance, the width of the insulating area on the first surface of the cathode sheet, and the width of the insulating area on the second surface of the cathode sheet includes: Based on the first distance and the width of the insulating area on the first surface of the cathode sheet, the coverage of the first surface of the cathode sheet by the anode sheet is determined. The coverage of the anode plate over the second surface of the cathode plate is determined based on the first distance and the width of the insulating area on the second surface of the cathode plate.

3. The cell winding detection method as described in claim 2, characterized in that, Determining the coverage of the first surface of the cathode sheet by the anode sheet based on the first distance and the width of the insulating area on the first surface of the cathode sheet includes: Based on the first distance and the width of the insulating area on the first surface of the cathode sheet, calculate the coverage distance of the anode sheet over the first surface of the cathode sheet; The coverage of the first surface of the cathode by the anode sheet is determined based on the coverage distance of the anode sheet over the first surface of the cathode sheet and a preset coverage threshold range.

4. The cell winding detection method as described in claim 2, characterized in that, Determining the coverage of the anode plate on the second surface of the cathode plate based on the first distance and the width of the insulating area on the second surface of the cathode plate includes: Based on the first distance and the width of the insulating area on the second surface of the cathode sheet, calculate the coverage distance of the anode sheet over the second surface of the cathode sheet; The coverage of the second side of the cathode by the anode sheet is determined based on the coverage distance of the anode sheet over the second side of the cathode sheet and a preset coverage threshold range.

5. The cell winding detection method according to any one of claims 1 to 4, characterized in that, The edge of the insulating region in the first image is located at the far left of the first image, and the edge of the anode plate is located at the far right of the first image; The step of determining the first feature information and the second feature information based on the first image includes: Determine the edge lines in the first image; The first feature information is determined based on the rightmost edge line of the first image, and the second feature information is determined based on the leftmost edge line of the first image.

6. The cell winding detection method according to any one of claims 1 to 4, characterized in that, The first image also includes the edge of the diaphragm, which is the edge close to the insulating area. The edge of the diaphragm is located on the far left of the first image, and the edge of the anode plate is located on the far right of the first image. The step of determining the first feature information and the second feature information based on the first image includes: Determine the edge lines in the first image; The first feature information is determined based on the rightmost edge line in the first image, and the second feature information is determined based on the second edge line from the left in the first image.

7. The cell winding detection method as described in claim 1, characterized in that, The acquisition of the first image includes: The first image is acquired at preset time intervals, wherein the preset time interval is greater than or equal to the time it takes for the anode and cathode plates to be wound around the winding needle once.

8. A battery cell winding detection device, characterized in that, The device includes: The acquisition module is used to acquire a first image, which is obtained after the anode sheet and cathode sheet are wound onto the winding needle. It is also used to acquire the width of the insulating area of ​​the first side of the cathode sheet and the width of the insulating area of ​​the second side of the cathode sheet, wherein the first side and the second side are arranged opposite to each other. The processing module is configured to determine first feature information and second feature information based on the first image, wherein the first feature information characterizes the position of the edge of the anode sheet, and the second feature information characterizes the position of the edge of the insulating region of the cathode sheet, wherein the edge of the insulating region is the edge away from the active region of the cathode sheet, and the edge of the anode sheet is the edge close to the insulating region; The processing module is further configured to determine a first distance based on the first feature information and the second feature information, wherein the first distance characterizes the distance between the edge of the anode sheet and the edge of the insulating region; It is also used to determine the coverage of the anode sheet on the first and second surfaces of the cathode sheet based on the first distance, the width of the insulating area on the first surface of the cathode sheet, and the width of the insulating area on the second surface of the cathode sheet.

9. A battery cell winding detection system, characterized in that, The system includes: An imaging device is used to capture a first image after the anode sheet and cathode sheet are wound onto a winding needle, and is also used to obtain the width of the insulating region of the first side of the cathode sheet and the width of the insulating region of the second side of the cathode sheet before the cathode sheet is wound onto the winding needle, wherein the first side and the second side are arranged opposite to each other. A processor connected to the imaging device is configured to determine first feature information and second feature information based on the first image, wherein the first feature information characterizes the position of the edge of the anode sheet, and the second feature information characterizes the position of the edge of the insulating region of the cathode sheet, wherein the edge of the insulating region is the edge away from the active region of the cathode sheet, and the edge of the anode sheet is the edge close to the insulating region; The processor is further configured to determine a first distance based on the first feature information and the second feature information, wherein the first distance characterizes the distance between the edge of the anode sheet and the edge of the insulating region; It is also used to determine the coverage of the anode sheet on the first and second surfaces of the cathode sheet based on the first distance, the width of the insulating area on the first surface of the cathode sheet, and the width of the insulating area on the second surface of the cathode sheet.

10. The cell winding detection system as described in claim 9, characterized in that, The imaging device is an infrared camera.

11. The cell winding detection system as described in claim 10, characterized in that, The cell winding detection system further includes an infrared light source, which provides infrared light with a wavelength greater than 1000 nanometers.

12. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the cell winding detection method as described in any one of claims 1 to 7.

13. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the cell winding detection method as described in any one of claims 1 to 7.

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