Battery appearance defect detection system and point inspection method

Abstract

The invention provides a battery appearance defect detection system and a point inspection method, and belongs to the technical field of batteries. According to the system, a first film is attached to the first surface of a battery profiling body, and a second film is attached to the second surface of the battery profiling body; the first camera is located right above the first film and is configured to be used for collecting a detection image of the first film, and the second camera is opposite to the second film and is configured to be used for collecting a detection image of the second film. The first strip-shaped light source, the second strip-shaped light source, the third strip-shaped light source, the fourth strip-shaped light source, the fifth strip-shaped light source and the sixth strip-shaped light source are configured to irradiate the calibration block at the same time. The upper computer is configured to determine hardware point inspection results of the first camera and the first strip-shaped light source, the second strip-shaped light source, the third strip-shaped light source and the fourth strip-shaped light source according to a detection image of the first film; and determining hardware point inspection results of the second camera, the fifth strip-shaped light source and the sixth strip-shaped light source according to the detection image of the second film.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery appearance defect detection system and a point inspection method. BACKGROUND

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

[0003] During the production process of the battery, various defects may occur on the appearance of the battery, which may affect the quality and safety of the battery. Therefore, it is of great significance to detect the defects of the battery appearance. However, the current battery appearance defect detection system has the problem of low reliability. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present application is to provide a battery appearance defect detection system and a point inspection method to effectively monitor the stability of the battery appearance defect detection system.

[0005] The embodiment of the first aspect of the application provides a battery appearance defect detection system, which comprises a calibration block, an image acquisition assembly, a light source and an upper computer. The calibration block comprises a battery profile body, a first film and a second film. The first film is attached to a first surface of the battery profile body, and the second film is attached to a second surface of the battery profile body. The first surface and the second surface are adjacent, the first surface extends along a first direction and a second direction, and the second surface extends along the first direction and a third direction. The second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction and the second direction. The first film and the second film each comprise a plurality of rectangular regions. Each rectangular region comprises a circular color block, a rectangular color block and a special-shaped color block surrounding the circular color block and the rectangular color block. The radii of the plurality of circular color blocks are different from each other, the widths of the plurality of rectangular color blocks are different from each other, and the gray values of the plurality of special-shaped color blocks are different from each other. The image acquisition assembly comprises a first camera and a second camera. The first camera is located directly above the first film and is configured to acquire a detection image of the first film. The second camera is opposite to the second film and is configured to acquire a detection image of the second film. The light source comprises a first linear light source, a second linear light source, a third linear light source, a fourth linear light source, a fifth linear light source and a sixth linear light source. The first linear light source, the second linear light source, the third linear light source and the fourth linear light source are arranged below the first camera and above the first surface. The first linear light source and the second linear light source extend along the first direction and are respectively located on the two sides of the first camera. The third linear light source and the fourth linear light source extend along the second direction and are respectively located on the two sides of the first camera. The fifth linear light source and the sixth linear light source are arranged between the second surface and the second camera. The fifth linear light source and the sixth linear light source extend along the third direction and are respectively located on the two sides of the second camera. The first linear light source, the second linear light source, the third linear light source, the fourth linear light source, the fifth linear light source and the sixth linear light source are configured to irradiate the calibration block at the same time. The upper computer is configured to determine a hardware point inspection result of the first camera and the first linear light source, the second linear light source, the third linear light source and the fourth linear light source according to the detection image of the first film acquired by the first camera, and determine a hardware point inspection result of the second camera, the fifth linear light source and the sixth linear light source according to the detection image of the second film acquired by the second camera. The point inspection result indicates whether the camera and the light source are normal.

[0006] In the technical scheme of the embodiment of the application, the circular color blocks, the rectangular color blocks and the special-shaped color blocks surrounding the circular color blocks and the rectangular color blocks are arranged on the film sheet, the radii of the plurality of circular color blocks are different from each other, the widths of the plurality of rectangular color blocks are different from each other, and the gray values of the plurality of special-shaped color blocks are different from each other, so that the accuracy and reliability of size identification and the accuracy and reliability of gray identification of the battery appearance defect detection system can be detected, thereby improving the reliability of the battery appearance defect detection system. Meanwhile, the first film sheet and the second film sheet are arranged on different surfaces, so that the hardware at a plurality of positions can be detected at the same time, thereby improving the point inspection efficiency of the battery appearance defect detection system.

[0007] In some embodiments, the first surface and the second surface of the battery profiling body are respectively provided with grooves for accommodating the first film sheet and the second film sheet, so that the upper surface of the first film sheet is flush with the first surface, and the upper surface of the second film sheet is flush with the second surface. By arranging grooves on the first surface and the second surface of the battery profiling body on which the film sheets are attached, the depth of the grooves is the same as the thickness of the first film sheet and the second film sheet, so that the upper surface of the first film sheet can be flush with the first surface of the battery profiling body, and the upper surface of the second film sheet can be flush with the second surface of the battery profiling body. This can simulate the real imaging of the actual flat battery surface, and can also reduce the imaging error caused by the height difference to a certain extent, thereby improving the detection accuracy of the battery appearance defect detection system point inspection and the consistency of actual detection to a certain extent.

[0008] In some embodiments, along a first preset path sequentially passing through a plurality of rectangular regions, the gray values of the special-shaped color blocks gradually increase or gradually decrease; the smallest circular color block in the plurality of rectangular regions has a radius greater than or equal to a minimum detection size of the camera, and along a second preset path sequentially passing through the plurality of rectangular regions, the radii of the circular color blocks increase or decrease by an integer multiple of the minimum detection size; the smallest rectangular color block in the plurality of rectangular color blocks has a width greater than or equal to the minimum detection size of the camera, and along a third preset path sequentially passing through the plurality of rectangular color blocks, the widths of the rectangular color blocks increase or decrease by an integer multiple of the minimum detection size. By setting the gray values in the film sheet to gradually increase or gradually decrease along the first preset path sequentially passing through the plurality of rectangular regions, and setting the sizes to increase or decrease by an integer multiple of the minimum detection size along the second preset path sequentially passing through the plurality of rectangular regions, and along the third preset path sequentially passing through the plurality of rectangular color blocks, the widths of the rectangular color blocks increase or decrease by an integer multiple of the minimum detection size. This can make the gray values and sizes better present in the detection image and be conducive to identification, thereby improving the accuracy of the battery appearance defect detection system point inspection to a certain extent.

[0009] In some embodiments, the host computer is configured to determine point inspection determination parameters according to the detection image, and determine the hardware point inspection result according to the point inspection determination parameters; wherein the point inspection determination parameters include the detection value of the gray value of the special-shaped color block, the detection value of the radius of the circular color block, and the detection value of the width of the rectangular color block; and the hardware point inspection result is determined according to the detection value of the gray value of the special-shaped color block, the detection value of the radius of the circular color block, and the detection value of the width of the rectangular color block. The hardware point inspection result of the battery appearance defect detection system can be determined intuitively and accurately, so as to effectively detect the stability of the battery appearance defect detection system.

[0010] In some embodiments, the calibration block further comprises a third film sheet attached to the first surface of the battery profiling body, and the image acquisition assembly further comprises a third camera configured to acquire a detection image of the third film sheet. By attaching the third film sheet to the first surface of the battery profiling body, i.e., by simultaneously arranging the first film sheet and the second film sheet on the first surface of the battery profiling body, the host computer can simultaneously acquire the detection image of the first film sheet and the detection image of the third film sheet, so that the host computer can determine the hardware point inspection result of the first camera, the third camera, the first linear light source, the second linear light source, the third linear light source, and the fourth linear light source according to the detection image of the first film sheet and the detection image of the third film sheet, thereby further improving the accuracy of the hardware point inspection result of the first camera, the third camera, the first linear light source, the second linear light source, the third linear light source, and the fourth linear light source.

[0011] In some embodiments, the calibration block further comprises a fourth film sheet attached to a third surface of the battery profiling body, the third surface being opposite to the second surface, and the second camera is further configured to acquire a detection image of the fourth film sheet. By attaching the fourth film sheet to the third surface of the battery profiling body, the second camera acquires the detection image of the fourth film sheet, so that the host computer can determine the hardware point inspection result of the second camera, the fifth linear light source, and the sixth linear light source according to the detection image of the second film sheet and the detection image of the fourth film sheet, thereby further improving the accuracy of the hardware point inspection result of the second camera, the fifth linear light source, and the sixth linear light source.

[0012] Embodiments of the second aspect of the application provide a point inspection method of a battery appearance defect detection system, applied to the battery appearance defect detection system according to the above-mentioned embodiments. The point inspection method comprises: an image acquisition assembly acquiring a detection image; a host computer determining point inspection determination parameters according to the detection image, the point inspection determination parameters including a detection value of a gray value of a special-shaped color block, a detection value of a radius of a circular color block, and a detection value of a width of a rectangular color block; and the host computer determining a hardware point inspection result according to the point inspection determination parameters.

[0013] In the technical scheme of the embodiment of the application, the point inspection determination parameter comprises a detection value of a gray value of a special-shaped color block in the detection image, a detection value of a radius of a circular color block, and a detection value of a width of a rectangular color block; the accuracy and reliability of size identification and the accuracy and reliability of gray identification of the battery appearance defect detection system can be detected, so that the reliability of the battery appearance defect detection system is improved.

[0014] In some embodiments, the host computer determines the hardware point inspection result according to the point inspection determination parameter, comprising: comparing the point inspection determination parameter with the corresponding known characteristic parameter, wherein the known characteristic parameter comprises a known gray value of the special-shaped color block, a known radius of the circular color block, and a known width of the rectangular color block; and determining the hardware point inspection result as point inspection failure in response to at least one of the following: a deviation of a difference between the detection values of the gray values of any two special-shaped color blocks and a difference between the known gray values in the corresponding known characteristic parameter exceeds a gray threshold range; a deviation of the detection value of the radius of any circular color block and the known radius in the corresponding known characteristic parameter exceeds a first size threshold range; and a deviation of the detection value of the width of any rectangular color block and the known width in the corresponding known characteristic parameter exceeds a second size threshold range. Comparing at least one of the deviation of the difference between the detection values of the gray values of any two special-shaped color blocks and the difference between the known gray values in the corresponding known characteristic parameter exceeds the gray threshold range; the deviation of the detection value of the radius of any circular color block and the known radius in the corresponding known characteristic parameter exceeds the first size threshold range; and the deviation of the detection value of the width of any rectangular color block and the known width in the corresponding known characteristic parameter exceeds the second size threshold range, can intuitively and accurately determine the hardware point inspection result of the battery appearance defect detection system, so that the obtained hardware point inspection result is more accurate, and the point inspection accuracy of the battery appearance defect detection system is improved.

[0015] In some embodiments, the detection image comprises a detection image of a first film and a detection image of a second film, the point inspection determination parameter comprises a first point inspection determination parameter associated with the first film and a second point inspection determination parameter associated with the second film, and the host computer determines the point inspection determination parameter according to the detection image, comprising: the host computer determines the first point inspection determination parameter according to the detection image of the first film, and determines the second point inspection determination parameter according to the detection image of the second film. The host computer determines the first point inspection determination parameter according to the detection image of the first film, and determines the second point inspection determination parameter according to the detection image of the second film, so that the determined point inspection determination parameter is more accurate.

[0016] In some embodiments, the host computer determines the hardware point inspection result of the first camera and the first linear light source, the second linear light source, the third linear light source and the fourth linear light source according to the first point inspection determination parameter, and determines the hardware point inspection result of the second camera and the fifth linear light source and the sixth linear light source according to the second point inspection determination parameter. The host computer determines the hardware point inspection result of the first camera and the first linear light source, the second linear light source, the third linear light source and the fourth linear light source according to the first point inspection determination parameter, and determines the hardware point inspection result of the second camera and the fifth linear light source and the sixth linear light source according to the second point inspection determination parameter, which can make the point inspection determination parameter more targeted, thereby improving the point inspection accuracy of the battery appearance defect detection system.

[0017] In some embodiments, the calibration block further comprises a third film sheet attached to the first surface of the battery profiling body, and the image acquisition assembly further comprises a third camera configured to acquire a detection image of the third film sheet; the method further comprises: the third camera acquiring the detection image of the third film sheet; the host computer determining a third point inspection determination parameter associated with the third film sheet according to the detection image of the third film sheet; and the host computer determining the hardware point inspection result of the first camera, the third camera, the first linear light source, the second linear light source, the third linear light source and the fourth linear light source according to the first point inspection determination parameter and the third point inspection determination parameter. The host computer determines the hardware point inspection result of the first camera, the third camera, the first linear light source, the second linear light source, the third linear light source and the fourth linear light source according to the detection image of the first film sheet and the detection image of the third film sheet, which further improves the accuracy of the hardware point inspection result of the first camera, the third camera, the first linear light source, the second linear light source, the third linear light source and the fourth linear light source.

[0018] In some embodiments, the calibration block further comprises a fourth film sheet attached to a third surface of the battery profiling body, the third surface being opposite to the second surface, and the second camera is further configured to acquire a detection image of the fourth film sheet; the method further comprises: the second camera acquiring the detection image of the fourth film sheet; the host computer determining a fourth point inspection determination parameter associated with the fourth film sheet according to the detection image of the fourth film sheet; and the host computer determining the hardware point inspection result of the second camera, the fifth linear light source and the sixth linear light source according to the fourth point inspection determination parameter and the second point inspection determination parameter. The host computer determines the hardware point inspection result of the second camera, the fifth linear light source and the sixth linear light source according to the detection image of the second film sheet and the detection image of the fourth film sheet, thereby further improving the accuracy of the hardware point inspection result of the second camera, the fifth linear light source and the sixth linear light source.

[0019] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the present application can be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0020] In the drawings, like reference numerals refer to same or similar components throughout the several views, unless otherwise indicated. These drawings are not necessarily to scale, and the emphasis is instead placed upon the principles of the application. It is to be expressly understood that these drawings are only meant to depict some embodiments of the present disclosure and should not be viewed as limiting the scope of the present application.

[0021] Figure 1 A schematic diagram of a battery appearance defect detection system according to some embodiments of the present application;

[0022] Figure 2 A schematic diagram of a calibration block according to some embodiments of the present application;

[0023] Figure 3 A schematic diagram of a film according to some embodiments of the present application;

[0024] Figure 4 A schematic diagram of a film according to some other embodiments of the present application;

[0025] Figure 5 A point inspection method flowchart of a battery appearance defect detection system according to some embodiments of the present application.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 1000, a battery appearance defect detection system;

[0028] 100, a calibration block; 110, a battery profile; 121, a first film; 122, a second film; 123, a third film; 10, a rectangular area; 11, a first rectangular area; 12, a second rectangular area; 20, a circular color block; 30, a special-shaped color block; 40, a rectangular color block; X, a first direction; Y, a second direction; Z, a third direction; 111, a first surface; 112, a second surface; 113, a groove; P1, a first preset path; P2, a second preset path; P3, a third preset path;

[0029] 200, an image acquisition assembly; 210, a first camera; 220, a second camera; 230, a third camera;

[0030] 310, a first linear light source; 320, a second linear light source; 330, a third linear light source; 340, a fourth linear light source; 350, a fifth linear light source; 360, a sixth linear light source;

[0031] 400, host computer. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical scheme of the present application, thus only serve as examples, and cannot be used to limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0035] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0037] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0041] Various appearance defects may occur in the production process of the battery, which will affect the quality and safety of the battery. In the related art, a battery appearance defect detection system can be used to detect the battery, and the battery appearance defect detection system needs to be calibrated when the battery appearance defect detection system is initially installed. In some cases, after the production situation changes or the equipment changes, the camera and the light source in the battery appearance defect detection system may not be able to accurately detect the battery, and the detection stability of the battery appearance defect detection system may change. In order to prevent the battery appearance defect detection system from failing and causing defective products to flow out, the reliability of the battery appearance defect detection system needs to be checked. In some embodiments, in the process of winding the microporous film, the battery appearance defect detection system is used to detect the appearance defects of the battery after winding the microporous film, but there is a lack of point inspection of the reliability of the battery appearance defect detection system itself.

[0042] To this end, embodiments of the present application provide a battery appearance defect detection system capable of self-reliability point inspection. The system comprises a battery profile body, a first film sheet, a second film sheet, a first camera, a second camera, a first linear light source, a second linear light source, a third linear light source, a fourth linear light source, a fifth linear light source, a sixth linear light source, and a host computer. The first film sheet is attached to a first surface of the battery profile body, and the second film sheet is attached to a second surface of the battery profile body; the first camera is located directly above the first film sheet and is configured to capture a detection image of the first film sheet, and the second camera is opposite the second film sheet and is configured to capture a detection image of the second film sheet. The first linear light source, the second linear light source, the third linear light source, and the fourth linear light source are arranged below the first camera and above the first surface, and the fifth linear light source and the sixth linear light source are arranged between the second surface and the second camera. The host computer determines the hardware point inspection result of the battery appearance defect detection system according to the detection image of the first film sheet captured by the first camera.

[0043] When the battery appearance defect detection system is subjected to hardware point inspection, by arranging circular color blocks, rectangular color blocks, and special-shaped color blocks surrounding the circular color blocks and the rectangular color blocks on the film sheets, the radii of the plurality of circular color blocks are different from each other, the widths of the plurality of rectangular color blocks are different from each other, and the gray values of the plurality of special-shaped color blocks are different from each other, the accuracy and reliability of size recognition and the accuracy and reliability of gray scale recognition of the battery appearance defect detection system can be detected, thereby improving the reliability of the battery appearance defect detection system. At the same time, the first film sheet and the second film sheet are arranged on different surfaces, respectively, so that the hardware at multiple positions can be detected at the same time, thereby improving the point inspection efficiency of the battery appearance defect detection system.

[0044] The battery appearance defect detection system and the point inspection method disclosed in the embodiments of the present application can be used for detecting batteries on a production line, but are not limited thereto, and can also be used for detecting battery monomers on a production line or batteries that are already in service. The batteries can be used in electric devices such as vehicles, ships, or aircraft, but are not limited thereto. The battery appearance defect detection system disclosed in the present application can be used, which is beneficial to effectively monitoring the stability of the battery appearance defect detection system.

[0045] Embodiments of the present application provide a battery appearance defect detection system 1000. Figure 1 A schematic diagram of the battery appearance defect detection system of some embodiments of the present application; Figure 2 A schematic diagram of a calibration block of some embodiments of the present application; Figure 3 A schematic diagram of a film sheet of some embodiments of the present application; Figure 4 A schematic diagram of a film sheet of some other embodiments of the present application. As shown in Figures 1 to 4 The battery appearance defect detection system 1000 comprises a calibration block 100, an image acquisition assembly 200, light sources, and a host computer 400.

[0046] The calibration block 100 comprises a battery profile 110, a first film 121 and a second film 122. The first film 121 is attached to a first surface 111 of the battery profile 110, and the second film 122 is attached to a second surface 112 of the battery profile 110. The first surface 111 is adjacent to the second surface 112, and extends along a first direction X and a second direction Y. The second surface 112 extends along the first direction X and a third direction Z. The second direction Y is perpendicular to the first direction X, and the third direction Z is perpendicular to the first direction X and the second direction Y. The first film 121 and the second film 122 each comprise a plurality of rectangular regions 10. Each rectangular region 10 comprises a circular color block 20, a rectangular color block 40, and a special-shaped color block 30 surrounding the circular color block 20 and the rectangular color block 40. The radii of the plurality of circular color blocks 20 are different from each other. The widths of the plurality of rectangular color blocks 40 are different from each other. The gray values of the plurality of special-shaped color blocks 30 are different from each other.

[0047] The image acquisition assembly 200 comprises a first camera 210 and a second camera 220. The first camera 210 is located directly above the first film 121 and is configured to acquire a detection image of the first film 121. The second camera 220 is opposite to the second film 122 and is configured to acquire a detection image of the second film 122.

[0048] The light source comprises a first linear light source 310, a second linear light source 320, a third linear light source 330, a fourth linear light source 340, a fifth linear light source 350, and a sixth linear light source 360. The first linear light source 310, the second linear light source 320, the third linear light source 330, and the fourth linear light source 340 are arranged below the first camera 210 and above the first surface 111. The first linear light source 310 and the second linear light source 320 extend along the first direction X and are respectively located on the two sides of the first camera 210. The third linear light source 330 and the fourth linear light source 340 extend along the second direction Y and are respectively located on the two sides of the first camera 210. The fifth linear light source 350 and the sixth linear light source 360 are arranged between the second surface 112 and the second camera 220. The fifth linear light source 350 and the sixth linear light source 360 extend along the third direction Z and are respectively located on the two sides of the second camera 220. The first linear light source 310, the second linear light source 320, the third linear light source 330, the fourth linear light source 340, the fifth linear light source 350, and the sixth linear light source 360 are all configured to irradiate the calibration block 100 at the same time.

[0049] The host computer 400 is configured to determine, according to the detection image of the first film 121 collected by the first camera 210, the hardware point inspection result of the first camera 210 and the first, second, third and fourth linear light sources 310, 320, 330 and 340; and determine, according to the detection image of the second film 122 collected by the second camera 220, the hardware point inspection result of the second camera 220, the fifth and sixth linear light sources 350 and 360, the point inspection result indicating whether the camera and the light source are normal.

[0050] In an example, the calibration block 100 can be used to perform hardware point inspection on the battery appearance defect detection system 1000. The calibration block 100 can include a battery profiling body 110, the shape and size of which can be the same as that of the battery to be detected by the battery appearance defect detection system 1000. The calibration block 100 can further include a first film 121 and a second film 122. The first film 121 can be attached to a first surface 111 of the battery profiling body 110, and the second film 122 can be attached to a second surface 112 of the battery profiling body 110. The first surface 111 can be a surface of the battery profiling body 110 facing the first camera 210, and the second surface 112 can be a surface of the battery profiling body 110 facing the second camera 220. The first surface 111 can extend along a first direction X and a second direction Y, and the second surface 112 can extend along the first direction X and a third direction Z. The second direction Y is perpendicular to the first direction X, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0051] In an example, the film can include a plurality of rectangular regions 10. Each rectangular region 10 can include a circular color block 20, a rectangular color block 40, and a special-shaped color block 30 surrounding the circular color block 20 and the rectangular color block 40. In each rectangular region 10, the circular color block 20 and the rectangular color block 40 are located inside the special-shaped color block 30, and the gray value of the circular color block 20 and the gray value of the rectangular color block 40 are different from the gray value of the special-shaped color block 30, so as to facilitate identification and differentiation. In an example, the gray value of the special-shaped color block 30 can range from 0 to 255, with white being 255 and black being 0. The gray values of the plurality of special-shaped color blocks 30 are different from each other, so as to verify whether the battery appearance defect detection system 1000 is normal in identifying different gray values in an image. The radii of the plurality of circular color blocks 20 are different from each other, and the widths of the plurality of rectangular color blocks 40 are different from each other, so as to verify whether the battery appearance defect detection system 1000 is normal in identifying different sizes in an image. The radius of the circular color block 20 and the width of the rectangular color block 40 are easy to be identified and measured by the battery appearance defect detection system 1000.

[0052] In some embodiments, as Figure 3As shown, the film sheet can include two rectangular regions 10, which are a first rectangular region 11 and a second rectangular region 12 respectively. Each rectangular region 10 can include two circular color blocks 20, four rectangular color blocks 40 and one irregular color block 30 surrounding the circular color blocks 20 and the rectangular color blocks 40. The gray scale values of the two irregular color blocks 30 are different from each other, for example, the gray scale value of the first irregular color block 30 in the first rectangular color block 40 is 60, and the gray scale value of the second irregular color block 30 in the second rectangular color block 40 is 200. The radii of the two circular color blocks 20 included in one rectangular region 10 are different from each other, for example, the radius of the first circular color block 20 in the first rectangular region 11 is 1 millimeter (mm), and the radius of the second circular color block 20 in the first rectangular region 11 is 2 mm. The widths of the four rectangular color blocks 40 included in one rectangular region 10 are different from each other, for example, the width of the first rectangular color block 40 in the first rectangular region 11 is 0.5 mm, the width of the second rectangular color block 40 in the first rectangular region 10 is 1.5 mm, the width of the third rectangular color block 40 in the first rectangular region 11 is 2.5 mm, and the width of the fourth rectangular color block 40 in the first rectangular region 11 is 3.5 mm.

[0053] The number of rectangular regions 10 is not specifically limited in the present application. However, it can be understood that the more the number of rectangular regions 10, the more the surface of the film sheet is divided into a larger number of detection regions, and the more detection regions the battery appearance defect detection system 1000 can compare, so that the point inspection result of the battery appearance defect detection system 1000 has a higher accuracy. In some embodiments, when determining the number of rectangular regions 10 of the film sheet, a specific setting can be made according to the accuracy requirement of the detection, so as to further improve the accuracy of the point inspection of the battery appearance defect detection system 1000.

[0054] In an example, the camera can be a charge coupled device (CCD) camera. When applied to the detection process of the battery, the image acquisition assembly 200 can be used to acquire images of the battery. The image acquisition assembly 200 can include a first camera 210 and a second camera 220, the first camera 210 can be located directly above the first film sheet 121, and the first camera 210 can acquire an acquisition image of the first film sheet 121; the second camera 220 is opposite to the second film sheet 122, and the second camera 220 can acquire a detection image of the second film sheet 122.

[0055] In an example, in order to make the detection image captured by the camera clearer, the calibration block 100 can be illuminated by light sources when the camera captures the image. Since the first surface 111 of the battery profile 110 facing the first camera 210 can extend along the first direction X and the second direction Y, bar light sources extending along the first direction X and the second direction Y can be selected to illuminate the calibration block 100. The first bar light source 310, the second bar light source 320, the third bar light source 330 and the fourth bar light source 340 can be used to illuminate the calibration block 100 simultaneously. The first bar light source 310, the second bar light source 320, the third bar light source 330 and the fourth bar light source 340 can be disposed below the first camera 210 and above the first surface 111. The first bar light source 310 and the second bar light source 320 extend along the first direction X and are respectively located on the two sides of the first camera 210, and the third bar light source 330 and the fourth bar light source 340 extend along the second direction Y and are respectively located on the two sides of the first camera 210. Similarly, since the second surface 112 of the battery profile 110 facing the second camera 220 can extend along the first direction X and the third direction Z, bar light sources extending along the third direction Z can be selected to illuminate the second surface 112. The fifth bar light source 350 and the sixth bar light source 360 can be used to illuminate the second surface 112 simultaneously. The fifth bar light source 350 and the sixth bar light source 360 can be disposed between the second camera 220 and the second surface 112. The fifth bar light source 350 and the sixth bar light source 360 extend along the third direction Z and are respectively located on the two sides of the second camera 220. The first bar light source 310, the second bar light source 320, the third bar light source 330, the fourth bar light source 340, the fifth bar light source 350 and the sixth bar light source 360 illuminate the calibration block 100 simultaneously, which can make the illumination more uniform, so that a clearer detection image can be captured.

[0056] In an example, the host computer 400 can be a Manufacturing Execution System (MES). The host computer 400 can determine the point inspection judgment parameters according to the detection image, and determine the hardware point inspection result according to the judgment parameters. The hardware point inspection result can include that the first camera 210, the second camera 220, the first linear light source 310, the second linear light source 320, the third linear light source 330, the fourth linear light source 340, the fifth linear light source, and the sixth linear light source 360 of the battery appearance defect detection system 1000 are normal or abnormal. Hardware normal of the battery appearance defect detection system 1000 indicates that the accuracy of the battery appearance defect detection system 1000 for detecting appearance defects of the battery is high, and the battery appearance defect detection system 1000 can be used normally. Hardware abnormal of the battery appearance defect detection system 1000 indicates that the accuracy of the battery appearance defect detection system 1000 for detecting appearance defects of the battery is low, and the battery appearance defect detection system 1000 is used abnormally.

[0057] In the embodiments of the present application, by setting the circular color blocks 20, the rectangular color blocks 40, and the special-shaped color blocks 30 surrounding the circular color blocks 20 and the rectangular color blocks 40 on the film, the radii of the plurality of circular color blocks 20 are different from each other, the widths of the plurality of rectangular color blocks 40 are different from each other, and the gray values of the plurality of special-shaped color blocks 30 are different from each other. The accuracy and reliability of size recognition and the accuracy and reliability of gray recognition of the battery appearance defect detection system 1000 can be detected, thereby improving the reliability of the battery appearance defect detection system 1000. At the same time, the first film 121 and the second film 122 are respectively arranged on different surfaces, so that the hardware at multiple positions can be detected at the same time, thereby improving the point inspection efficiency of the battery appearance defect detection system 1000.

[0058] According to some embodiments of the present application, the first surface 111 and the second surface 112 of the battery profiling body 110 are respectively provided with grooves 113 for accommodating the first film 121 and the second film 122, so that the upper surface of the first film 121 is flush with the first surface 111, and the upper surface of the second film 122 is flush with the second surface 112.

[0059] In an example, the first surface 111 of the battery profiling body 110 on which the first film 121 is attached and the second surface 112 of the battery profiling body 110 on which the second film 122 is attached can respectively include a groove 113 recessed inwardly, and the first film 121 and the second film 122 are attached in the groove 113.

[0060] In the example, the groove 113 is a groove formed by recessing the first surface 111 and the second surface 112 of the battery profiling body 110, in order to make the first film 121 and the second film 122 more stable when being attached in the groove 113, the size of the groove 113 can be greater than or equal to the size of the first film 121 and the second film 122, and the depth of the groove 113 can be the same as the thickness of the first film 121 and the second film 122, so that the upper surface of the first film 121 can be flush with the first surface 111 of the battery profiling body 110, and the upper surface of the second film 122 can be flush with the second surface 112 of the battery profiling body 110.

[0061] In the example, the groove 113 is a groove formed by recessing the first surface 111 and the second surface 112 of the battery profiling body 110, in order to make the first film 121 and the second film 122 more stable when being attached in the groove 113, the size of the groove 113 can be greater than or equal to the size of the first film 121 and the second film 122, and the depth of the groove 113 can be the same as the thickness of the first film 121 and the second film 122, so that the upper surface of the first film 121 can be flush with the first surface 111 of the battery profiling body 110, and the upper surface of the second film 122 can be flush with the second surface 112 of the battery profiling body 110.

[0062] According to some embodiments of the present application, along the first preset path P1 passing through the plurality of rectangular regions 10 in sequence, the gray value of the irregular-shaped color block 30 gradually increases or gradually decreases; the smallest circular color block 20 in the plurality of circular color blocks 20 of the plurality of rectangular regions 10 has a radius greater than or equal to the minimum detection size of the camera, and along the second preset path P2 passing through the plurality of rectangular regions 10 in sequence, the radius of the circular color block 20 increases or decreases by an integer multiple of the minimum detection size; the smallest rectangular color block 40 in the plurality of rectangular color blocks 40 has a width greater than or equal to the minimum detection size of the camera, and along the third preset path P3 passing through the plurality of rectangular color blocks 40 in sequence, the width of the rectangular color block 40 increases or decreases by an integer multiple of the minimum detection size.

[0063] In the example, the first preset path P1 can be preset, and any path passing through each rectangular region 10 in sequence, along the first preset path P1, the gray value of the plurality of irregular-shaped color blocks 30 corresponding to the plurality of rectangular regions 10 changes regularly, for example, gradually increases or gradually decreases.

[0064] Reference Figure 3In some embodiments, a first preset path P1 can be defined on the film sheet, and the gray scale values of the plurality of irregular color blocks 30 gradually increase or gradually decrease along the path. In this way, the battery appearance defect detection system 1000 can sequentially obtain the gray scale values of the irregular color blocks 30 in each rectangular region 10 along the first path, and when the gray scale values of the two irregular color blocks 30 obtained by the battery appearance defect detection system 1000 along the first preset path P1 do not conform to the preset change rule, it can be considered that the reliability of the battery appearance defect detection system 1000 is insufficient, and it is not necessary to continue to detect or compare the gray scale values of the subsequent irregular color blocks 30 on the first preset path P1. In this way, the calculation amount of the battery appearance defect detection system 1000 can be reduced to a certain extent, thereby improving the efficiency of the point inspection to a certain extent.

[0065] In some embodiments, the gray scale values of the plurality of irregular color blocks 30 can vary in an arithmetic manner along the first preset path P1. In the arithmetic variation manner, the gray scale values of the irregular color blocks 30 are evenly distributed in a given gray scale value interval, the detection is more comprehensive, and the problem that the reliability of the battery appearance defect detection system 1000 in some possible gray scale value intervals cannot be identified is avoided to a certain extent, thereby improving the accuracy of the point inspection to a certain extent.

[0066] In an example, the minimum detection size of the camera refers to the actual size corresponding to one pixel point in the collected image. The smaller the minimum detection size, the higher the resolution of the image collected by the camera, and the higher the detection accuracy. If the radius of the circular color block 20 is smaller than the minimum detection size of the camera, the radius of the circular color block 20 cannot be accurately presented in the image collected by the camera, which is not conducive to subsequent image recognition.

[0067] In an example, the second preset path P2 can be a preset path passing through any of the rectangular regions 10 in sequence, and the radii of the plurality of circular color blocks 20 corresponding to the plurality of rectangular regions 10 vary regularly along the second preset path P2, for example, increase or decrease by an integer multiple of the minimum detection size. The variation manner that the radii of the plurality of circular color blocks 20 increase or decrease by an integer multiple of the minimum detection size makes the radii of the circular color blocks 20 on the film sheet uniformly cover the size interval that needs to be tested for length recognition ability, and more comprehensive testing is achieved. In addition, the radius of the circular color block 20 is an integer multiple of the minimum detection size of the image acquisition unit, which is also conducive to display and recognition in the image, thereby improving the accuracy of the reliability test to a certain extent.

[0068] In an example, the third preset path P3 can be a preset path that sequentially passes through each rectangular region 10, and along the third preset path P3, the widths of the plurality of rectangular color blocks 40 corresponding to the plurality of rectangular regions 10 change regularly, for example, increase or decrease by an integer multiple of the minimum detection size. The change of the widths of the plurality of rectangular color blocks 40 by an integer multiple of the minimum detection size makes the widths of the rectangular color blocks 40 on the film uniformly cover the size interval that needs to be identified for length identification capability testing, and achieves more comprehensive testing. In addition, the width of the rectangular color block 40 being an integer multiple of the minimum detection size of the image acquisition unit is also conducive to display and identification in the image, thereby further improving the accuracy of the reliability test to a certain extent.

[0069] In the embodiments of the present application, the gray value in the film is set to gradually increase or gradually decrease along the first preset path P1 that sequentially passes through the plurality of rectangular regions 10; the size is set to increase or decrease by an integer multiple of the minimum detection size along the second preset path P2 that sequentially passes through the plurality of rectangular regions 10; and the width of the rectangular color block 40 increases or decreases by an integer multiple of the minimum detection size along the third preset path P3 that sequentially passes through the plurality of rectangular color blocks 40. This can make the gray value and the size better present in the detection image and be conducive to identification, thereby improving the accuracy of the 1000-point test of the battery appearance defect detection system to a certain extent.

[0070] According to some embodiments of the present application, the host computer 400 is configured to determine a point inspection judgment parameter according to the detection image, and determine a hardware point inspection result according to the point inspection judgment parameter. The point inspection judgment parameter includes a detection value of the gray value of the irregular color block 30, a detection value of the radius of the circular color block 20, and a detection value of the width of the rectangular color block 40.

[0071] In an example, the host computer 400 can determine a point inspection judgment parameter according to the detection image before performing hardware point inspection on the battery appearance defect detection system 1000. The detection image includes a plurality of irregular color blocks 30 with different gray values, a plurality of circular color blocks 20 with different radii, and a plurality of rectangular color blocks 40 with different widths. Therefore, the point inspection judgment parameter can include a detection value of the gray value of the irregular color block 30, a detection value of the radius of the circular color block 20, and a detection value of the width of the rectangular color block 40, for hardware point inspection on the battery appearance defect detection system 1000.

[0072] In the embodiments of the present application, the hardware point inspection result is determined according to the detection value of the gray value of the special-shaped color block 30, the detection value of the radius of the circular color block 20, and the detection value of the width of the rectangular color block 40. The hardware point inspection result of the battery appearance defect detection system 1000 can be determined intuitively and accurately, so that the stability of the battery appearance defect detection system 1000 can be effectively detected.

[0073] According to some embodiments of the present application, the calibration block 100 further comprises a third film 123, which is attached to the first surface 111 of the battery profiling body 110. The image acquisition assembly 200 further comprises a third camera 230, which is configured to acquire a detection image of the third film 123.

[0074] In an example, a groove 113 for accommodating the third film 123 can be arranged on the first surface 111 of the battery profiling body 110. The recess depth of the groove 113 can be the same as the thickness of the third film 123, so that the upper surface of the third film 123 can be flush with the first surface 111 of the battery profiling body 110.

[0075] In an example, the third film 123 and the first film 121 can be arranged along the second direction Y. Meanwhile, the third camera 230 and the first camera 210 can be arranged along the second direction Y. The third camera 230 can be a CCD camera.

[0076] In the embodiments of the present application, by attaching the third film 123 to the first surface 111 of the battery profiling body 110, that is, arranging the first film 121 and the second film 122 on the first surface 111 of the battery profiling body 110 at the same time, the host computer 400 can acquire the detection image of the first film 121 and the detection image of the third film 123 at the same time. The host computer 400 can determine the hardware point inspection result of the first camera 210, the third camera 230, the first linear light source 310, the second linear light source 320, the third linear light source 330, and the fourth linear light source 340 according to the detection image of the first film 121 and the detection image of the third film 123. Therefore, the accuracy of the hardware point inspection result of the first camera 210, the third camera 230, the first linear light source 310, the second linear light source 320, the third linear light source 330, and the fourth linear light source 340 is further improved.

[0077] According to some embodiments of the present application, the calibration block 100 further comprises a fourth film (not shown). The fourth film is attached to a third surface of the battery profiling body 110, and the third surface is opposite to the second surface 112. The second camera 220 is further configured to acquire a detection image of the fourth film.

[0078] In the example, the third surface of the battery profiling body 110 can be provided with a groove 113 for accommodating the third film 123, and the recess depth of the groove 113 can be the same as the thickness of the third film 123, so that the upper surface of the third film 123 can be flush with the third surface of the battery profiling body 110.

[0079] In the example, the calibration block 100 can be flipped by the gripper so that the second camera 220 is opposite to the fourth film, and the fifth linear light source 350 and the sixth linear light source 360 are arranged between the third surface and the second camera 220, and the fifth linear light source 350 and the sixth linear light source 360 extend along the third direction Z and are respectively located on both sides of the second camera 220, and the second camera 220 collects the detection image of the fourth film.

[0080] In the embodiment of the application, the fourth film is attached to the third surface of the battery profiling body 110, and the second camera 220 collects the detection image of the fourth film, so that the host computer 400 can determine the hardware point inspection result of the second camera 220, the fifth linear light source 350 and the sixth linear light source 360 according to the detection image of the second film 122 and the detection image of the fourth film, thereby further improving the accuracy of the hardware point inspection result of the second camera 220, the fifth linear light source 350 and the sixth linear light source 360.

[0081] According to another aspect of the application, a point inspection method of a battery appearance defect detection system 1000 is provided, which is applied to the battery appearance defect detection system 1000 in the foregoing embodiments.

[0082] Figure 5 The point inspection method of the battery appearance defect detection system 1000 in the embodiment of the application is shown in a flowchart. As shown in Figure 5 The point inspection method of the battery appearance defect detection system 1000 includes: step S510, the image acquisition assembly 200 acquires a detection image; step S520, the host computer 400 determines point inspection judgment parameters according to the detection image, the point inspection judgment parameters including a detection value of the gray value of the irregular color block 30, a detection value of the radius of the circular color block 20 and a detection value of the width of the rectangular color block 40; and step S530, the host computer 400 determines a hardware point inspection result according to the point inspection judgment parameters.

[0083] Step S510, the image acquisition assembly 200 acquires a detection image.

[0084] In an example, the image acquisition component 200 can acquire the calibration image in the following manner. After the image acquisition component 200 receives the hardware inspection instruction of the battery appearance defect detection system 1000 sent by the host computer 400, the image acquisition component 200 performs one or more shootings on the calibration block 100 in response to the inspection instruction of the host computer 400, and acquires multiple detection images. The detection images include images of the film.

[0085] In step S520, the host computer 400 determines the inspection judgment parameters according to the detection images. The inspection judgment parameters include a detection value of the gray value of the irregular color block 30, a detection value of the radius of the circular color block 20, and a detection value of the width of the rectangular color block 40.

[0086] In an example, the film can include multiple rectangular regions 10. Each rectangular region 10 can include a circular color block 20, a rectangular color block 40, and an irregular color block 30 surrounding the circular color block 20 and the rectangular color block 40. In each rectangular region 10, the circular color block 20 and the rectangular color block 40 are located inside the irregular color block 30, and the gray value of the circular color block 20 and the gray value of the rectangular color block 40 are different from the gray value of the irregular color block 30, so as to facilitate identification and differentiation. In an example, the gray value of the irregular color block 30 can range from 0 to 255, where white is 255 and black is 0. The gray values of the multiple irregular color blocks 30 are different from each other, so as to verify whether the identification ability of the battery appearance defect detection system 1000 for different gray values in an image is normal. The radii of the multiple circular color blocks 20 are different from each other, and the widths of the multiple rectangular color blocks 40 are different from each other, so as to verify whether the identification ability of the battery appearance defect detection system 1000 for different sizes in an image is normal. The radius of the circular color block 20 and the width of the rectangular color block 40 are easy to be identified and measured by the battery appearance defect detection system 1000.

[0087] In some embodiments, as Figure 3As shown, the film sheet can include two rectangular regions 10, respectively a first rectangular region 11 and a second rectangular region 12. Each rectangular region 10 can include two circular color blocks 20, four rectangular color blocks 40 and one irregular color block 30 surrounding the circular color blocks 20 and the rectangular color blocks 40. The gray scale values of the two irregular color blocks 30 are different from each other, for example, the gray scale value of the first irregular color block 30 in the first rectangular color block 40 is 60, and the gray scale value of the second irregular color block 30 in the second rectangular color block 40 is 200. The radii of the two circular color blocks 20 included in one rectangular region 10 are different from each other, for example, the radius of the first circular color block 20 in the first rectangular region 11 is 1 millimeter (mm), and the radius of the second circular color block 20 in the first rectangular region 11 is 2 mm. The widths of the four rectangular color blocks 40 included in one rectangular region 10 are different from each other, for example, the width of the first rectangular color block 40 in the first rectangular region 11 is 0.5 mm, the width of the second rectangular color block 40 in the first rectangular region 11 is 1.5 mm, the width of the third rectangular color block 40 in the first rectangular region 11 is 2.5 mm, and the width of the fourth rectangular color block 40 in the first rectangular region 11 is 3.5 mm.

[0088] In step S530, the host computer 400 determines the hardware point inspection result according to the point inspection determination parameter.

[0089] In an example, the hardware point inspection result can include that the hardware of the battery appearance defect detection system 1000 is normal or the hardware of the battery appearance defect detection system 1000 is abnormal. The hardware of the battery appearance defect detection system 1000 being normal indicates that the accuracy of the battery appearance defect detection system 1000 in detecting the appearance defects of the battery is high, and the battery appearance defect detection system 1000 can be used normally. The hardware of the battery appearance defect detection system 1000 being abnormal indicates that the accuracy of the battery appearance defect detection system 1000 in detecting the appearance defects of the battery is low, and the battery appearance defect detection system 1000 is used abnormally.

[0090] In the embodiments of the present application, the point inspection determination parameter includes a detection value of the gray scale value of the irregular color block 30, a detection value of the radius of the circular color block 20 and a detection value of the width of the rectangular color block 40 in the detection image; the accuracy and reliability of the size recognition and the accuracy and reliability of the gray scale recognition of the battery appearance defect detection system 1000 can be detected, so as to improve the reliability of the battery appearance defect detection system 1000.

[0091] According to some embodiments of the present application, the host computer 400 determines the hardware point inspection result according to the point inspection determination parameter includes:

[0092] The point inspection determination parameter is compared with the corresponding known characteristic parameter, wherein the known characteristic parameter includes a known gray scale value of the irregular color block 30, a known radius of the circular color block 20 and a known width of the rectangular color block 40.

[0093] The hardware point inspection result is determined as point inspection failure in response to at least one of the following:

[0094] The difference between the detected value of the gray value of any two irregular-shaped color blocks 30 and the difference between the known gray values in the corresponding known characteristic parameters exceeds the gray threshold range;

[0095] The difference between the detected value of the radius of any circular color block 20 and the known radius in the corresponding known characteristic parameters exceeds the first size threshold range;

[0096] The difference between the detected value of the width of any rectangular color block 40 and the known width in the corresponding known characteristic parameters exceeds the second size threshold range.

[0097] In an example, the known characteristic parameters can be directly noted on the calibration block 100, can be stored in the upper computer 400, and can be noted on the calibration block 100 and stored in the upper computer 400 at the same time. It can be understood that the various storage modes of the known characteristic parameters in the calibration block 100 are all for the convenience of point inspection of the battery appearance defect detection system 1000 and to improve the point inspection speed of the battery appearance defect detection system 1000.

[0098] In an example, the gray threshold value can be the allowable fluctuation range of the gray value under the normal condition of the battery appearance defect detection system 1000. The corresponding gray threshold values of different battery appearance defect detection systems 1000 can be the same or different. The first size threshold and the second size threshold can be the allowable fluctuation range of the size under the normal condition of the battery appearance defect detection system 1000. The corresponding first size threshold of different battery appearance defect detection systems 1000 can be the same or different.

[0099] In one embodiment, the difference between the detected value of the gray value of any two irregular-shaped color blocks 30 and the difference between the known gray values in the corresponding known characteristic parameters exceeds the gray threshold range, and the hardware point inspection result is determined as point inspection failure.

[0100] In another embodiment, the difference between the detected value of the radius of any circular color block 20 and the known radius in the corresponding known characteristic parameters exceeds the first size threshold range, and the hardware point inspection result is determined as point inspection failure.

[0101] In yet another embodiment, the difference between the detected value of the width of any rectangular color block 40 and the known width in the corresponding known characteristic parameters exceeds the second size threshold range, and the hardware point inspection result is determined as point inspection failure.

[0102] In the embodiments of the present application, at least one of the following conditions is met: a difference between a detected value of the gray value of any two irregular color blocks 30 and a difference between the known gray values in the corresponding known characteristic parameters exceeds a gray threshold range; a difference between a detected value of the radius of any circular color block 20 and a known radius in the corresponding known characteristic parameters exceeds a first size threshold range; and a difference between a detected value of the width of any rectangular color block 40 and a known width in the corresponding known characteristic parameters exceeds a second size threshold range. In this way, the hardware point inspection result of the battery appearance defect detection system 1000 can be determined intuitively and accurately, the obtained hardware point inspection result is more accurate, and the point inspection accuracy of the battery appearance defect detection system 1000 is improved.

[0103] According to some embodiments of the present application, the detection images include a detection image of the first film 121 and a detection image of the second film 122. The point inspection judgment parameters include first point inspection judgment parameters associated with the first film 121 and second point inspection judgment parameters associated with the second film 122. The host computer 400 determines the point inspection judgment parameters according to the detection images, including: the host computer 400 determines the first point inspection judgment parameters according to the detection image of the first film 121, and determines the second point inspection judgment parameters according to the detection image of the second film 122.

[0104] In an example, the first point inspection judgment parameters can include a detected value of the gray value of the irregular color block 30, a detected value of the radius of the circular color block 20, and a detected value of the width of the rectangular color block 40 on the first film 121. The second point inspection judgment parameters can include a detected value of the gray value of the irregular color block 30, a detected value of the radius of the circular color block 20, and a detected value of the width of the rectangular color block 40 on the second film 122.

[0105] In the embodiments of the present application, the host computer 400 determines the first point inspection judgment parameters according to the detection image of the first film 121, and determines the second point inspection judgment parameters according to the detection image of the second film 122, which can make the determined point inspection judgment parameters more accurate.

[0106] According to some embodiments of the present application, the host computer 400 determines the hardware point inspection result according to the point inspection judgment parameters, including: the host computer 400 determines the hardware point inspection result of the first camera 210 and the first, second, third, and fourth bar light sources 310, 320, 330, and 340 according to the first point inspection judgment parameters; and determines the hardware point inspection result of the second camera 220 and the fifth and sixth bar light sources 350 and 360 according to the second point inspection judgment parameters.

[0107] In an example, the first point inspection determination parameter can include a detection value of the gray value of the irregular color block 30, a detection value of the radius of the circular color block 20, and a detection value of the width of the rectangular color block 40 on the first film sheet 121. Since the detection image of the first film sheet 121 is captured by the first camera 210 under the irradiation of the first bar light source 310, the second bar light source 320, the third bar light source 330, and the fourth bar light source 340, the first determination parameter is related to the first camera 210, the first bar light source 310, the second bar light source 320, the third bar light source 330, and the fourth bar light source 340.

[0108] In an example, the second point inspection determination parameter can include a detection value of the gray value of the irregular color block 30, a detection value of the radius of the circular color block 20, and a detection value of the width of the rectangular color block 40 on the second film sheet 122. Since the detection image of the second film sheet 122 is captured by the second camera 220 under the irradiation of the fifth bar light source 350 and the sixth bar light source 360, the second determination parameter is related to the second camera 220, the fifth bar light source 350, and the sixth bar light source 360.

[0109] In the embodiments of the present application, the host computer 400 determines the hardware point inspection results of the first camera 210 and the first bar light source 310, the second bar light source 320, the third bar light source 330, and the fourth bar light source 340 according to the first point inspection determination parameter, and determines the hardware point inspection results of the second camera 220 and the fifth bar light source 350 and the sixth bar light source 360 according to the second point inspection determination parameter, so that the point inspection determination parameter is more targeted, thereby improving the point inspection accuracy of the battery appearance defect detection system 1000.

[0110] According to some embodiments of the present application, the calibration block 100 further includes a third film sheet 123 attached to the first surface 111 of the battery profiling body 110, and the image acquisition assembly 200 further includes a third camera 230 configured to capture a detection image of the third film sheet 123. The point inspection method further includes: the third camera 230 acquires the detection image of the third film sheet 123; the host computer 400 determines a third point inspection determination parameter associated with the third film sheet 123 according to the detection image of the third film sheet 123; and the host computer 400 determines the hardware point inspection results of the first camera 210, the third camera 230, the first bar light source 310, the second bar light source 320, the third bar light source 330, and the fourth bar light source 340 according to the first point inspection determination parameter and the third point inspection determination parameter.

[0111] In an example, the third point inspection determination parameter can include a detection value of the gray value of the irregular color block 30, a detection value of the radius of the circular color block 20, and a detection value of the width of the rectangular color block 40 on the third film sheet 123. In an example, the third point inspection determination parameter can include a detection value of the gray value of the irregular color block 30, a detection value of the radius of the circular color block 20, and a detection value of the width of the rectangular color block 40 on the third film sheet 123.

[0112] In the embodiments of the present application, the host computer 400 determines the hardware point inspection result of the first camera 210, the third camera 230, the first linear light source 310, the second linear light source 320, the third linear light source 330 and the fourth linear light source 340 according to the detection image of the first film 121 and the detection image of the third film 123, thereby further improving the accuracy of the hardware point inspection result of the first camera 210, the third camera 230, the first linear light source 310, the second linear light source 320, the third linear light source 330 and the fourth linear light source 340.

[0113] According to some embodiments of the present application, the calibration block 100 further comprises a fourth film, the fourth film being attached to a third surface of the battery profiling body 110, the third surface being opposite to the second surface 112, and the second camera 220 is further configured to acquire a detection image of the fourth film. The point inspection method further comprises: the second camera 220 acquires the detection image of the fourth film; the host computer 400 determines a fourth point inspection judgment parameter associated with the fourth film according to the detection image of the fourth film; and the host computer 400 determines the hardware point inspection result of the second camera 220, the fifth linear light source 350 and the sixth linear light source 360 according to the fourth point inspection judgment parameter and the second point inspection judgment parameter.

[0114] In an example, the fourth point inspection judgment parameter can include a detection value of the gray value of the special-shaped color block 30 on the fourth film, a detection value of the radius of the circular color block 20 and a detection value of the width of the rectangular color block 40.

[0115] In the embodiments of the present application, the host computer 400 determines the hardware point inspection result of the second camera 220, the fifth linear light source 350 and the sixth linear light source 360 according to the detection image of the second film 122 and the detection image of the fourth film, thereby further improving the accuracy of the hardware point inspection result of the second camera 220, the fifth linear light source 350 and the sixth linear light source 360.

[0116] The technical solutions of the present application are further described below through some specific embodiments.

[0117] As Figures 1 to 5As shown, the film sheet includes a plurality of rectangular regions 10, each of the rectangular regions 10 includes a circular color block 20, a rectangular color block 40 and a special-shaped color block 30 surrounding the circular color block 20 and the rectangular color block 40, the radii of the plurality of circular color blocks 20 are different from each other, the widths of the plurality of rectangular color blocks 40 are different from each other, and the gray values of the plurality of special-shaped color blocks 30 are different from each other. Along a first preset path P1 sequentially passing through the plurality of rectangular regions 10, the gray value of the special-shaped color block 30 gradually increases or gradually decreases; the radius of the smallest circular color block 20 among the circular color blocks 20 of the plurality of rectangular regions 10 is greater than or equal to the minimum detection size of the camera, and along a second preset path P2 sequentially passing through the plurality of rectangular regions 10, the radius of the circular color block 20 increases or decreases by an integer multiple of the minimum detection size; the width of the smallest rectangular color block 40 among the plurality of rectangular color blocks 40 is greater than or equal to the minimum detection size of the camera, and along a third preset path P3 sequentially passing through the plurality of rectangular color blocks 40, the width of the rectangular color block 40 increases or decreases by an integer multiple of the minimum detection size.

[0118] The battery appearance defect detection system 1000 includes a calibration block 100, an image acquisition assembly 200, a light source and an upper computer 400.

[0119] The calibration block 100 includes a battery profiling body 110, a first film sheet 121, a second film sheet 122, a third film sheet 123 and a fourth film sheet. The first film sheet 121 and the third film sheet 123 are attached to a first surface 111 of the battery profiling body 110, the second film sheet 122 is attached to a second surface 112 of the battery profiling body 110, and the fourth film sheet is attached to a third surface of the battery profiling body 110. The first surface 111 is adjacent to the second surface 112, and extends along a first direction X and a second direction Y. The second surface 112 extends along the first direction X and a third direction Z. The second direction Y is perpendicular to the first direction X, and the third direction Z is perpendicular to the first direction X and the second direction Y. The third surface is opposite to the second surface 112.

[0120] The first surface 111, the second surface 112 and the third surface of the battery profiling body 110 are respectively provided with grooves 113 for accommodating the first film sheet 121, the second film sheet 122, the third film sheet 123 and the fourth film sheet, so that the upper surfaces of the first film sheet 121 and the third film sheet 123 are flush with the first surface 111, the upper surface of the second film sheet 122 is flush with the second surface 112, and the upper surface of the fourth film sheet is flush with the third surface.

[0121] The image acquisition component 200 includes a first camera 210 and a second camera 220. The first camera 210 is located directly above the first film 121 and is configured to acquire the detection image of the first film 121. The second camera 220 is opposite to the second film 122 and is configured to acquire the detection image of the second film 122.

[0122] The light source includes a first strip light source 310, a second strip light source 320, a third strip light source 330, a fourth strip light source 340, a fifth strip light source 350, and a sixth strip light source 360. The first strip light source 310, the second strip light source 320, the third strip light source 330, and the fourth strip light source 340 are disposed below the first camera 210 and above the first surface 111. The first strip light source 310 and the second strip light source 320 extend along the first direction X and are respectively located on both sides of the first camera 210. The third strip light source 330 and the fourth strip light source 340 extend along the second direction Y and are respectively located on both sides of the first camera 210. The fifth bar light source 350 and the sixth bar light source 360 ​​are disposed between the second surface 112 and the second camera 220. The fifth bar light source 350 and the sixth bar light source 360 ​​extend along the third direction Z and are located on both sides of the second camera 220 respectively. The first bar light source 310, the second bar light source 320, the third bar light source 330, the fourth bar light source 340, the fifth bar light source 350 and the sixth bar light source 360 ​​are all configured to simultaneously illuminate the calibration block 100.

[0123] The host computer 400 is configured to determine the detection values ​​of the grayscale value of the irregular color block 30, the detection value of the radius of the circular color block 20, and the detection value of the width of the rectangular color block 40 based on the detection image of the first film 121 acquired by the first camera 210, and to determine the detection values ​​of the first camera 210 and the first bar light source 310, the second bar light source 320, the third bar light source 330, and the fourth bar light source 340 based on the detection values ​​of the grayscale value of the irregular color block 30, the detection value of the radius of the circular color block 20, and the detection value of the width of the rectangular color block 40. Hardware inspection results: Based on the detection image of the second film 122 acquired by the second camera 220, the detection values ​​of the grayscale value of the irregular color block 30, the radius of the circular color block 20, and the width of the rectangular color block 40 are determined. Based on the detection values ​​of the grayscale value of the irregular color block 30, the radius of the circular color block 20, and the width of the rectangular color block 40, the hardware inspection results of the second camera 220, the fifth strip light source 350, and the sixth strip light source 360 ​​are determined. The inspection results indicate whether the camera and light source are normal.

[0124] like Figure 5 As shown, the inspection method of the battery appearance defect detection system applied to the battery appearance defect detection system 1000 in the foregoing embodiments includes:

[0125] In step S510, the image acquisition component 200 acquires the detection image.

[0126] In step S520, the host computer 400 determines the point inspection determination parameter according to the detection image. The point inspection determination parameter includes the detection value of the gray value of the special-shaped color block 30, the detection value of the radius of the circular color block 20, and the detection value of the width of the rectangular color block 40.

[0127] In step S530, the host computer 400 determines the hardware point inspection result according to the point inspection determination parameter.

[0128] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery appearance defect detection system, characterized in that, include: The calibration block includes a battery profilotype, a first film, and a second film. The first film is attached to a first surface of the battery profilotype, and the second film is attached to a second surface of the battery profilotype. The first surface and the second surface are adjacent. The first surface extends along a first direction and a second direction, and the second surface extends along the first direction and a third direction. The second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction and the second direction. Both the first film and the second film include multiple rectangular regions. Each rectangular region includes a circular color block, a rectangular color block, and irregularly shaped color blocks surrounding the circular and rectangular color blocks. The radii of the multiple circular color blocks are different, the widths of the multiple rectangular color blocks are different, and the grayscale values ​​of the multiple irregularly shaped color blocks are different. An image acquisition component includes a first camera and a second camera. The first camera is located directly above the first film and is configured to acquire a detection image of the first film. The second camera is opposite to the second film and is configured to acquire a detection image of the second film. The light source includes a first strip light source, a second strip light source, a third strip light source, a fourth strip light source, a fifth strip light source, and a sixth strip light source. The first, second, third, and fourth strip light sources are disposed below the first camera and above the first surface. The first and second strip light sources extend along a first direction and are respectively located on both sides of the first camera. The third and fourth strip light sources extend along a second direction and are respectively located on both sides of the first camera. The fifth and sixth strip light sources are disposed between the second surface and the second camera. The fifth and sixth strip light sources extend along a third direction and are respectively located on both sides of the second camera. All six strip light sources are configured to simultaneously illuminate the calibration block. The host computer is configured to determine the hardware inspection results of the first camera and the first, second, third, and fourth bar light sources based on the detection image of the first film captured by the first camera, and to determine the hardware inspection results of the second camera, the fifth, and the sixth bar light sources based on the detection image of the second film captured by the second camera. The inspection results indicate whether the camera and the light source are functioning properly.

2. The battery appearance defect detection system according to claim 1, characterized in that, The first and second surfaces of the battery-shaped body are respectively provided with grooves, which are used to accommodate the first film and the second film, such that the upper surface of the first film is flush with the first surface, and the upper surface of the second film is flush with the second surface.

3. The battery appearance defect detection system according to claim 1, characterized in that, Along a first preset path that sequentially passes through the plurality of rectangular regions, the grayscale value of the irregularly shaped color block gradually increases or decreases; the radius of the smallest circular color block among the plurality of rectangular regions is greater than or equal to the minimum detection size of the camera, and along a second preset path that sequentially passes through the plurality of rectangular regions, the radius of the circular color block increases or decreases at integer multiples of the minimum detection size; the width of the smallest rectangular color block among the plurality of rectangular color blocks is greater than or equal to the minimum detection size of the camera, and along a third preset path that sequentially passes through the plurality of rectangular color blocks, the width of the rectangular color block increases or decreases at integer multiples of the minimum detection size.

4. The battery appearance defect detection system according to claim 1, characterized in that, The host computer is configured to determine inspection judgment parameters based on the detected image, and to determine the hardware inspection result based on the inspection judgment parameters; wherein, the inspection judgment parameters include the detected grayscale value of the irregular color block, the detected radius of the circular color block, and the detected width of the rectangular color block.

5. The battery appearance defect detection system according to any one of claims 1 to 4, characterized in that, The calibration block further includes a third film, which is attached to the first surface of the battery profilotype. The image acquisition component further includes a third camera, which is configured to acquire the detection image of the third film.

6. The battery appearance defect detection system according to any one of claims 1 to 5, characterized in that, The calibration block also includes a fourth film, which is attached to the third surface of the battery profilotype, the third surface being opposite to the second surface, and the second camera is further configured to acquire the detection image of the fourth film.

7. A method for inspecting a battery appearance defect detection system, characterized in that, The inspection method, applied to the battery appearance defect detection system according to any one of claims 1 to 6, comprises: The image acquisition component acquires the detection image; The host computer determines the inspection judgment parameters based on the detection image. The inspection judgment parameters include the detection value of the grayscale value of the irregular color block, the detection value of the radius of the circular color block, and the detection value of the width of the rectangular color block in the detection image. The host computer determines the hardware inspection result based on the inspection judgment parameters.

8. The inspection method of the battery appearance defect detection system according to claim 7, characterized in that, The host computer determines the hardware inspection result based on the inspection judgment parameters, including: The inspection judgment parameters are compared with the corresponding known feature parameters, wherein the known feature parameters include the known gray value of the irregular color block, the known radius of the circular color block, and the known width of the rectangular color block; The hardware inspection result is determined to be an inspection failure in response to at least one of the following: The difference between the detected gray values ​​of any two irregularly shaped color blocks and the difference between the known gray values ​​in the corresponding known feature parameters exceeds the gray value threshold range; The deviation between the detected value of the radius of any of the circular color blocks and the known radius in the corresponding known feature parameters exceeds the range of the first size threshold. The deviation between the detected value of the width of any of the rectangular color blocks and the known width in the corresponding known feature parameters exceeds the range of the second size threshold.

9. The inspection method of the battery appearance defect detection system according to claim 7 or 8, characterized in that, The detection image includes the detection image of the first film and the detection image of the second film. The inspection judgment parameters include a first inspection judgment parameter associated with the first film and a second inspection judgment parameter associated with the second film. The host computer determines the inspection judgment parameters based on the detection image, including: The host computer determines the first inspection judgment parameter based on the detection image of the first film, and determines the second inspection judgment parameter based on the detection image of the second film.

10. The inspection method of the battery appearance defect detection system according to claim 9, characterized in that, The host computer determines the hardware inspection result based on the inspection judgment parameters, including: The host computer determines the hardware inspection results of the first camera, the first bar light source, the second bar light source, the third bar light source, and the fourth bar light source based on the first inspection judgment parameters. The hardware inspection results of the second camera, the fifth strip light source, and the sixth strip light source are determined based on the second inspection judgment parameters.

11. The inspection method of the battery appearance defect detection system according to claim 10, characterized in that, The calibration block further includes a third film, which is attached to the first surface of the battery profilotype; the image acquisition component further includes a third camera configured to acquire the detection image of the third film; the method further includes: The third camera acquires the detection image of the third film; The host computer determines the third inspection judgment parameters associated with the third film based on the detected image of the third film; The host computer determines the hardware inspection results of the first camera, the third camera, the first bar light source, the second bar light source, the third bar light source, and the fourth bar light source based on the first inspection judgment parameter and the third inspection judgment parameter.

12. The inspection method of the battery appearance defect detection system according to claim 10 or 11, characterized in that, The calibration block further includes a fourth film, which is attached to the third surface of the battery profilotype, the third surface being opposite to the second surface. The second camera is also configured to acquire a detection image of the fourth film. The method further includes: The second camera acquires the detection image of the fourth film; The host computer determines the fourth inspection judgment parameter associated with the fourth film based on the detected image of the fourth film; The host computer determines the hardware inspection results of the second camera, the fifth strip light source, and the sixth strip light source based on the fourth inspection judgment parameter and the second inspection judgment parameter.

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