CN116626053B - Cell blue film defect detection method and device - Google Patents
Cell blue film defect detection method and device Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G01N21/8806—Specially adapted optical and illumination features
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
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Abstract
The application relates to a defect detection method and device for a cell blue film, and relates to the field of battery production. The application can improve the precision and efficiency of the cell blue film detection, can obviously distinguish the defects of bubbles and foreign matters, and avoids misjudgment and missed detection. Through optimizing the cooperation mode of light source and camera, realized the comprehensive detection to each face of electric core, can also effectively save equipment installation space and human cost simultaneously, can effectively distinguish bubble and foreign matter, and then improve the detection effect of electric core blue membrane.
Description
Technical Field
The application relates to the field of battery production, in particular to a defect detection method and device for a blue film of a battery cell.
Background
The battery cell is one of the main forms of energy storage elements and is widely applied to the fields of mobile phones, notebook computers, electric tools, electric automobiles and the like. The performance and the service life of the battery cell are closely related to the quality of the internal structure of the battery cell, and the blue film serves as a protective layer to isolate, fix and protect electrolyte and electrodes in the battery cell, so that the battery cell is an important part of the internal structure of the battery cell. Since bubbles, foreign matters or other defects may occur in the blue film during the packaging and manufacturing process of the battery cell, which negatively affects the performance and lifetime of the battery cell, it is very important to ensure the quality and defect detection of the blue film.
At present, the defect detection of the blue film of the battery cell generally adopts a 2.5D or 3D camera method, and various defects are detected by analyzing and processing images of the blue film. The bubble and the foreign matter can cause the bulge of the blue film, the imaging characteristics of the blue film are consistent in 2.5D, and two defects cannot be distinguished in a 2.5D image, but because the detection specification difference of the two defects is large, the two defects cannot be distinguished, and larger overlooking is caused.
Therefore, a novel cell blue film defect detection method and device are researched and developed, the detection accuracy, speed and efficiency are improved, the detection problem of bubbles and foreign matters is solved, and the method and device have important engineering application values.
Disclosure of Invention
Accordingly, the present application is directed to a method and apparatus for detecting defects of a cell blue film, by which bubbles and foreign matters can be effectively distinguished, and thus the detection effect of the cell blue film can be improved.
In order to achieve the above purpose, the present application provides the following technical solutions:
in a first aspect, the present application provides a method for detecting defects of a blue cell film, including the steps of:
detecting a cell blue film by adopting a mode that two groups of cameras are matched with a light source to obtain a cell detection image, wherein the cell detection image comprises a blue film surface bulge defect image obtained by imaging blue film bulges caused by bubbles in the cell blue film and foreign matters in the film by a first group of cameras, and an infrared light image obtained by detecting the foreign matters of each blue film bulge by a second group of cameras;
determining the central coordinate position and the contour area of each convex defect relative to the surface of the battery cell based on the blue film surface convex defect image;
traversing the central coordinate position and the outline area of each convex defect in the blue film surface convex defect image in an infrared light image, and confirming the infrared light image position of each blue film convex and the convex range of each blue film in the infrared light image;
and (3) taking the protruding range of the blue film as a detection range, detecting whether abnormal spots exist in each range, if so, determining that the abnormal spots exist in the film, otherwise, determining that the abnormal spots exist in the film, and determining that the abnormal spots exist in the film.
As a further scheme of the application, when the blue film of the battery cell is detected, the battery cell comprises a polar surface, a large surface, a narrow surface and a bottom surface, and the blue film is attached to the periphery of the battery cell, and when the polar surface is detected, the detection is carried out by adopting a mode that a color camera is matched with a coaxial light source, wherein the color camera and the coaxial light source are arranged on the same axis and the same axis direction of the polar column of the battery cell, and the axis direction of the color camera and the coaxial light source is perpendicular to the polar column surface of the battery cell.
As a further scheme of the application, when the blue film of the battery cell is detected, the blue film wrapping areas of the large face, the narrow face and the bottom face of the battery cell are detected in a mode that two groups of cameras are matched with a light source; the first group of cameras are 2.5D line scanning cameras, and the second group of cameras are common line scanning cameras.
As a further scheme of the application, the blue film surface bulge defect image obtained by imaging blue film bulge caused by bubbles in a blue film of a battery cell and foreign matters in the film by a first group of cameras comprises the following steps:
the 2.5D line scanning cameras of the first group of cameras and the strip image luminous LED light sources are arranged in a V shape, and plane defect detection is carried out on the basic surfaces including the large surface, the narrow surface and the bottom surface of the battery cell to obtain a blue film surface bulge defect image of the basic surface of the battery cell;
the defect image of the bulge on the surface of the blue film comprises bubbles and foreign matters in the film, wherein the bubbles and the foreign matters cause the bulge of the blue film.
As a further scheme of the application, the 2.5D line scanning camera and the stripe image luminous LED light source are arranged in a V shape, when the plane defect detection is carried out on the basic surface including the large surface, the narrow surface and the bottom surface of the battery cell, the detection line of sight of the 2.5D line scanning camera forms an included angle of 30+/-15 degrees with the vertical surface of the basic surface of the battery cell, and the light source incident direction of the stripe image luminous LED light source forms an included angle of 30+/-15 degrees with the vertical surface of the basic surface of the battery cell; the angle of the detection line of sight of the 2.5D line scanning camera is consistent with the angle of the incidence direction of the light source of the stripe image luminous LED light source relative to the basic surface of the battery cell.
As a further aspect of the present application, when the second group of cameras detects a foreign object on each blue film bump, the method includes the steps of:
the common line scanning camera of the second group of cameras is matched with the infrared array light source, and under the action of infrared light, the common line scanning camera penetrates through the blue film to detect, so that an infrared light image containing protrusions of each blue film is obtained.
As a further scheme of the application, the detection sight line of the second group of cameras is perpendicular to the detected basic surface and is in the same position with the incident light ray of the infrared array light source at the basic surface, and an included angle of 45+/-15 degrees is formed between the incident light ray of the infrared array light source and the basic surface.
As a further scheme of the application, the height of the infrared array light source relative to the basic surface is lower than that of the stripe image luminous LED light source; and the first group of cameras and the second group of cameras are separated by a preset interference prevention distance.
As a further scheme of the application, the raised defects in the blue film surface raised defect image detected by the 2.5D line scanning camera and the stripe image luminous LED light source are represented by white spots, and the foreign matters in the film in the infrared light image detected by the common line scanning camera and the infrared array light source are represented by black spots.
The application also provides a defect detection device of the cell blue film, which comprises a color camera, a coaxial light source, a line scanning camera, a stripe image luminous LED light source and an infrared array light source, wherein the color camera and the coaxial light source are coaxially arranged and used for detecting the polar surface of the cell; the line scanning camera comprises a 2.5D line scanning camera and a common line scanning camera, the 2.5D line scanning camera and the stripe image luminous LED light source are arranged in a V shape, plane defect detection is carried out on a basic surface including a large surface, a narrow surface and a bottom surface of the battery cell, a blue film surface protrusion defect image is obtained, and the common line scanning camera is matched with the infrared array light source to obtain an infrared light image containing each blue film protrusion.
As a further scheme of the application, the defect detection device of the cell blue film further comprises a controller and a motion platform, wherein the motion platform is used for realizing rotation and movement of the cell, so that all-dimensional detection can be carried out on each surface of the cell, and the motion platform can realize 360-degree rotation and vertical overturning, so that the detection is more accurate and has better adaptability.
As a further scheme of the application, the motion platform consists of a motor, a group of parts and a controller, and the motor and the controller cooperate to realize clockwise and anticlockwise rotation of the platform, so that the detection is more comprehensive and accurate.
As a further scheme of the application, a mechanical arm or a robot is additionally arranged on the motion platform, so that automatic feeding and discharging and battery cell transmission can be realized, and continuous and rapid detection of the battery cell blue film can be realized.
As a further scheme of the application, the motion platform is connected with the camera, the light source and other components by adopting wireless communication or wired communication, so that the application is convenient, flexible and easy to maintain.
The application also provides a cell blue film defect detection system, which comprises the cell blue film defect detection method or device, realizes the rapid and comprehensive detection of the cell blue film, and improves the production efficiency and quality level of a cell production line.
Compared with the prior art, the defect detection method and device for the cell blue film provided by the application have the following beneficial technical effects:
1. the defect detection precision is improved: according to the application, the two cameras are matched with the light source, so that bubbles and foreign matters can be effectively distinguished, and the light source can penetrate through the blue film for detection, so that the defect detection is more accurate and more refined.
2. Comprehensively detecting each surface of the battery cell: the method and the device can detect all the surfaces such as the pole post, the large surface, the narrow surface, the bottom surface and the like of the battery cell, fully cover all important parts of the battery cell including the blue film, and can effectively avoid missing detection and misjudgment.
3. The detection efficiency is improved: the method and the device adopt two groups of different cameras and light sources for detection, can detect a plurality of surfaces simultaneously, and have better penetrability of the light sources, so that the detection speed is higher and the working efficiency is higher.
4. Simplifying the structure of the detection device: the method and the device can realize the comprehensive detection of the cell blue film by adopting less equipment, the arrangement mode of the camera and the light source is simpler, and the installation space and the labor cost of the device can be effectively saved.
5. Has wide application prospect and market potential: the method and the device are a general cell blue film defect detection scheme, can be suitable for the production and manufacturing processes of various cells and batteries, and have very wide application prospects and market potential.
In summary, the method and the device for detecting the defects of the cell blue film can improve the precision and the efficiency of cell blue film detection, can obviously distinguish the defects of bubbles and foreign matters, and avoid misjudgment and missed detection. Through optimizing the cooperation mode of light source and camera, realized the comprehensive detection to each face of electric core, can also effectively save equipment installation space and human cost simultaneously. The technical scheme of the application has the advantages of simple structure, good detection effect, simple and convenient operation, low cost and the like, and has wide application prospect and market potential.
These and other aspects of the application will be more readily apparent from the following description of the embodiments. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application. In the drawings:
FIG. 1 is a flowchart of a method for detecting defects of a blue cell film according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a color camera and a coaxial light source for detecting defects in a blue cell film according to the present application;
FIG. 3 is a schematic diagram of a structure of two sets of cameras and a light source for detection in the method for detecting defects of a blue cell film according to the present application;
FIG. 4 is a schematic diagram of a cell movement in a method for detecting defects of a blue cell film according to the present application;
the achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The present application will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
In order to make the objects, technical solutions and advantages of the present application more apparent, the following embodiments of the present application will be described in further detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It should be noted that, in the embodiments of the present application, all the expressions "first" and "second" are used to distinguish two non-identical entities with the same name or non-identical parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present application. Furthermore, the terms "comprise" and "have," and any variations thereof, are intended to cover a non-exclusive inclusion, such as a process, method, system, article, or other step or unit that comprises a list of steps or units.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Because the current detection of the cell blue film generally adopts a pure 2.5D+3D camera detection scheme, the detection of bubbles and foreign matters is problematic, and the detection of the bubbles and the foreign matters is difficult to distinguish between the bubbles and the foreign matters. Moreover, the detection specifications of the two are very different, which can lead to a large over-kill. Therefore, the application provides the defect detection method and the defect detection device for the cell blue film, which adopt the cooperation of the two cameras and the light source, simplify the structure, effectively distinguish bubbles from foreign matters, have better detection effect, can improve the quality and the stability of the cell blue film, and bring great economic benefit and social benefit to the field of battery production.
Referring to fig. 1, an embodiment of the present application provides a method for detecting a defect of a blue film of a cell, wherein the method includes the following steps:
step 1, detecting a cell blue film by adopting a mode that two groups of cameras are matched with a light source to obtain a cell detection image, wherein the cell detection image comprises a blue film surface bulge defect image obtained by imaging blue film bulges caused by bubbles in the cell blue film and foreign matters in the film by a first group of cameras, and an infrared light image obtained by detecting the foreign matters of each blue film bulge by a second group of cameras;
since the convex defects on the surface of the blue film are all picked up (white spots in the image), and the bubbles and the foreign matters are contained, the appearance is white spots, and at this time, whether the bubbles or the foreign matters are the bubbles or the foreign matters cannot be distinguished.
Step 2, determining the central coordinate position and the contour area of each convex defect relative to the surface of the battery cell based on the blue film surface convex defect image;
step 3, traversing the central coordinate position and the outline area of each convex defect in the blue film surface convex defect image in an infrared light image, and confirming the infrared light image position of each blue film convex and the convex range of each blue film in the infrared light image;
and 4, taking the protruding range of the blue film as a detection range, detecting whether abnormal spots exist in each range, if so, determining that the abnormal spots exist in the film, otherwise, determining that the abnormal spots exist in the film, and determining that the abnormal spots exist in the film.
In the embodiment of the application, the application provides a defect detection method and device for a blue film of a battery cell. The method and the device can improve the precision and the efficiency of the cell blue film detection, can obviously distinguish the defects of bubbles and foreign matters, and avoid misjudgment and missed detection. Through optimizing the cooperation mode of light source and camera, realized the comprehensive detection to each face of electric core, can also effectively save equipment installation space and human cost simultaneously. The technical scheme of the application has the advantages of simple structure, good detection effect, simple and convenient operation, low cost and the like, and has wide application prospect and market potential.
In this embodiment, when detecting the blue film of the battery cell, the battery cell includes a polar surface, a large surface, a narrow surface and a bottom surface, and the blue film is attached to the periphery. Referring to fig. 2, when the polar cylinder is detected, a mode of matching the color camera 1 with the coaxial light source 2 is adopted, wherein the color camera 1 and the coaxial light source 2 are arranged on the same axis and have the same axial direction with the polar cylinder of the battery core, and the axial directions of the color camera 1 and the coaxial light source 2 are perpendicular to the polar cylinder of the battery core.
When the blue film of the battery cell is detected, the blue film wrapping areas of the large face, the narrow face and the bottom face of the battery cell are detected in a mode that two groups of cameras are matched with a light source; the first group of cameras is a 2.5D line scanning camera 3, and the second group of cameras is a common line scanning camera 5.
Referring to fig. 3, a first group of cameras images blue film surface protrusion defect images obtained by imaging blue film protrusions caused by bubbles in a blue film of a battery cell and foreign matters in the film, and the method comprises the following steps:
the 2.5D line scanning cameras 3 of the first group of cameras and the stripe image luminous LED light sources 4 are arranged in a V shape, and plane defect detection is carried out on a basic surface including a large surface, a narrow surface and a bottom surface of the battery cell to obtain a blue film surface bulge defect image of the basic surface of the battery cell;
the defect image of the bulge on the surface of the blue film comprises bubbles and foreign matters in the film, wherein the bubbles and the foreign matters cause the bulge of the blue film.
In this embodiment, the 2.5D line scan camera 3 and the stripe image light emitting LED light source 4 are arranged in a V shape, and when detecting a plane defect on a basic surface including a large surface, a narrow surface and a bottom surface of the electric core, an included angle of 30±15 ° is formed between a detection line of sight of the 2.5D line scan camera 3 and a vertical surface of the basic surface of the electric core, and an included angle of 30±15 ° is formed between a light source incident direction of the stripe image light emitting LED light source 4 and a vertical surface of the basic surface of the electric core, wherein the vertical surface of the basic surface of the electric core is located between the 2.5D line scan camera 3 and the stripe image light emitting LED light source 4; the angle of the detection line of sight of the 2.5D line scanning camera 3 and the incidence direction of the light source of the stripe image luminous LED light source 4 are kept consistent relative to the basic surface of the battery cell.
Referring to fig. 3 and 4, when the second group of cameras detects the foreign matter on each blue film bump, the method includes the following steps:
the common line scanning camera 5 of the second group of cameras is matched with the infrared array light source 6, and under the effect of infrared light, the common line scanning camera 5 penetrates through blue films to detect, so that an infrared light image containing protrusions of each blue film is obtained.
The detection line of sight of the second group of cameras is perpendicular to the detected basic surface and is intersected with the incident light of the infrared array light source 6 at the same position of the basic surface, and an included angle of 45+/-15 degrees is formed between the incident light of the infrared array light source 6 and the basic surface.
Referring to fig. 3 and 4, the height of the infrared array light source 6 with respect to the base surface is lower than the height of the stripe image light emitting LED light source 4 with respect to the base surface; and the first group of cameras and the second group of cameras are separated by a preset interference prevention distance.
The 2.5D line scanning camera 3 and the stripe image luminous LED light source 4 detect that the convex defects in the blue film surface convex defect image are represented by white spots, and the common line scanning camera 5 and the infrared array light source 6 detect that the foreign matters in the film are represented by black spots.
It is noted that the above-described figures are only schematic illustrations of processes involved in a method according to an exemplary embodiment of the application, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, in a plurality of membrane blocks.
It should be understood that although described in a certain order, the steps are not necessarily performed sequentially in the order described. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, some steps of the present embodiment may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily sequential, but may be performed alternately or alternately with at least a part of the steps or stages in other steps or other steps.
In a second aspect of the present application, referring to fig. 2 to 4, there is further provided a device for detecting a defect of a blue film of a battery cell, where the device for detecting a defect of a blue film of a battery cell includes a color camera 1, a coaxial light source 2, a line scanning camera, a stripe image light emitting LED light source 4, and an infrared array light source 6, where the color camera 1 is coaxially arranged with the coaxial light source 2 and is used for detecting a polar surface of the battery cell; the line scanning camera comprises a 2.5D line scanning camera 3 and a common line scanning camera 5, the 2.5D line scanning camera 3 and the stripe image luminous LED light source 4 are arranged in a V shape, plane defect detection is carried out on a basic surface including a large surface, a narrow surface and a bottom surface of the battery core, a blue film surface bulge defect image is obtained, and the common line scanning camera 5 is matched with the infrared array light source 6, so that an infrared light image containing each blue film bulge is obtained.
The defect detection device of the battery cell blue film further comprises a controller and a motion platform, wherein the motion platform is used for realizing rotation and movement of the battery cell, so that all-dimensional detection can be carried out on all surfaces of the battery cell, and the motion platform can realize 360-degree rotation and vertical overturning, so that detection is more accurate and has better adaptability.
In some embodiments, the motion platform is composed of a motor, a set of parts and a controller, and the motor cooperates with the controller to enable the platform to rotate clockwise and counterclockwise, thereby enabling more comprehensive and accurate detection.
And a mechanical arm or a robot is further added on the motion platform, so that automatic feeding and discharging and battery cell transmission can be realized, and continuous and rapid detection of the battery cell blue film can be realized.
The motion platform is connected with the camera, the light source and other components by adopting wireless communication or wired communication, and the camera is convenient, flexible and easy to maintain.
It should be noted that although in the above detailed description several membrane blocks or units of the device for action execution are mentioned, this division is not mandatory. Indeed, the features and functions of two or more membrane blocks or units described above may be embodied in one membrane block or unit, according to embodiments of the application. Conversely, the features and functions of one membrane block or unit described above may be further divided into a plurality of membrane blocks or units to be embodied.
In a third aspect, the application further provides a system for detecting defects of the cell blue film, which comprises the method or the device for detecting defects of the cell blue film, so that the cell blue film is rapidly and comprehensively detected, and the production efficiency and the quality level of a cell production line are improved.
According to the method and the device for detecting the defects of the cell blue film, provided by the application, the two cameras are matched with the light source, so that bubbles and foreign matters can be effectively distinguished, and the light source can penetrate the blue film for detection, so that the defect detection is more accurate and more refined.
The method and the device can detect all the surfaces such as the pole post, the large surface, the narrow surface, the bottom surface and the like of the battery cell, fully cover all important parts of the battery cell including the blue film, and can effectively avoid missing detection and misjudgment.
The method and the device adopt two groups of different cameras and light sources for detection, can detect a plurality of surfaces simultaneously, and have better penetrability of the light sources, so that the detection speed is higher and the working efficiency is higher.
The method and the device can realize the comprehensive detection of the cell blue film by adopting less equipment, the arrangement mode of the camera and the light source is simpler, and the installation space and the labor cost of the device can be effectively saved.
The method and the device are a general cell blue film defect detection scheme, can be suitable for the production and manufacturing processes of various cells and batteries, and have very wide application prospects and market potential.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items. The foregoing embodiment of the present application has been disclosed with reference to the number of embodiments for the purpose of description only, and does not represent the advantages or disadvantages of the embodiments.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the application, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the application, and many other variations of the different aspects of the embodiments of the application as described above exist, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the embodiments should be included in the protection scope of the embodiments of the present application.
Claims (2)
1. The defect detection method of the cell blue film is characterized by comprising the following steps of:
detecting a cell blue film by adopting a mode that two groups of cameras are matched with a light source to obtain a cell detection image, wherein the cell detection image comprises a blue film surface bulge defect image obtained by imaging blue film bulges caused by bubbles in the cell blue film and foreign matters in the film by a first group of cameras, and an infrared light image obtained by detecting the foreign matters of each blue film bulge by a second group of cameras;
determining the central coordinate position and the contour area of each convex defect relative to the surface of the battery cell based on the blue film surface convex defect image;
traversing the central coordinate position and the outline area of each convex defect in the blue film surface convex defect image in an infrared light image, and confirming the infrared light image position of each blue film convex and the convex range of each blue film in the infrared light image;
taking the protruding range of the blue film as a detection range, detecting whether abnormal spots exist in each range, if so, determining that the abnormal spots exist in the film, otherwise, determining that the abnormal spots exist in the film, and determining that the abnormal spots exist in the film;
when the blue film of the battery cell is detected, the battery cell comprises a polar surface, a large surface, a narrow surface and a bottom surface, and the blue film is attached to the periphery of the battery cell, and when the polar surface is detected, the detection is performed by adopting a mode that a color camera is matched with a coaxial light source, wherein the color camera and the coaxial light source are arranged on the same axis and have the same axis direction with the polar post of the battery cell, and the axis direction of the color camera and the coaxial light source is perpendicular to the polar surface of the battery cell;
the first group of cameras are 2.5D line scanning cameras, and the second group of cameras are common line scanning cameras;
the 2.5D line scanning cameras of the first group of cameras and the stripe image luminous LED light sources are arranged in a V shape;
the common line scanning camera of the second group of cameras is matched with the infrared array light source;
the detection sight line of the second group of cameras is perpendicular to the detected basic surface and is intersected with the incident light rays of the infrared array light source at the same position of the basic surface; the height of the infrared array light source relative to the basic surface is lower than the height of the fringe image luminous LED light source relative to the basic surface; the first group of cameras and the second group of cameras are separated by a preset interference prevention distance;
the method comprises the following steps of:
the 2.5D line scanning cameras of the first group of cameras and the strip image luminous LED light sources are arranged in a V shape, and plane defect detection is carried out on the basic surfaces including the large surface, the narrow surface and the bottom surface of the battery cell to obtain a blue film surface bulge defect image of the basic surface of the battery cell;
wherein, the blue film surface bulge defect image comprises bubbles and in-film foreign matters which cause the blue film bulge;
when the 2.5D line scanning camera and the strip image luminous LED light source are arranged in a V shape and detect plane defects of a basic surface including a large surface, a narrow surface and a bottom surface of the battery cell, an included angle of 30+/-15 degrees is formed between a detection sight line of the 2.5D line scanning camera and a vertical surface of the basic surface of the battery cell, and an included angle of 30+/-15 degrees is formed between the light source incident direction of the strip image luminous LED light source and the vertical surface of the basic surface of the battery cell; the angle of the detection line of sight of the 2.5D line scanning camera is consistent with the angle of the incidence direction of the light source of the stripe image luminous LED light source relative to the basic surface of the battery cell;
when the second group of cameras detect foreign matters on each blue film bulge, the method comprises the following steps:
the common line scanning camera of the second group of cameras is matched with the infrared array light source, and under the action of infrared light, the common line scanning camera penetrates through the blue film to detect, so that an infrared light image containing each blue film bulge is obtained;
an included angle of 45+/-15 degrees is formed between the incident light of the infrared array light source and the basic surface.
2. The method for detecting defects of a cell blue film according to claim 1, wherein the protruding defects in the blue film surface protruding defect image detected by the 2.5D line scan camera and the stripe image light emitting LED light source are represented by white spots, and the foreign matters in the film in the infrared light image detected by the normal line scan camera and the infrared array light source are represented by black spots.
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| CN116773438B (en) * | 2023-08-23 | 2023-12-12 | 深圳市什方智造科技有限公司 | Foreign matter detection method and system for battery blue film and controller |
| CN117782995A (en) * | 2024-02-23 | 2024-03-29 | 宁德时代新能源科技股份有限公司 | Defect detection method, defect detection system, defect detection apparatus, defect detection device, and storage medium |
| CN117870564A (en) * | 2024-03-11 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Detection method and system for cell Mylar film |
| CN117911420A (en) * | 2024-03-20 | 2024-04-19 | 宁德时代新能源科技股份有限公司 | Blue film detection method, device and system |
| CN117929280A (en) * | 2024-03-21 | 2024-04-26 | 宁德时代新能源科技股份有限公司 | Battery blue film coating system and battery blue film coating detection method |
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