3D scanning and visual inspection equipment for cylindrical secondary batteries

Abstract

To provide a 3D scanning for a cylindrical secondary battery and an appearance inspection device which can rotate a cylindrical secondary battery and can conduct coordinate extraction and surface imaging for an appearance inspection to generate a 3D model at the same time.SOLUTION: The present disclosure makes it possible to simplify the configuration for 3D scanning and an appearance inspection of a cylindrical secondary battery, acquire accurate 3D data, and accurately inspect the appearance.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a 3D scanning and appearance inspection device for cylindrical secondary batteries, and more particularly to a device that can generate 3D data using a 2D image and inspect the appearance. [Background technology]

[0002] The technology to scan 3D data of objects is used in a variety of industrial fields. In the case of secondary batteries, 3D scan data may be required to detect physical deformations that occur during the manufacturing process.

[0003] Previously, 3D scan data was obtained using methods such as time-of-flight cameras, stereo vision, laser scanning, and photogrammetry, but these methods had the problem of taking a long time to 3D scan the curved surface of a cylindrical secondary battery, and reducing accuracy. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide an apparatus that can quickly and accurately 3D scan a cylindrical secondary battery and simultaneously inspect its appearance. [Means for solving the problem]

[0005] To solve the above problem, a 3D scanning device for cylindrical secondary batteries is provided, which includes a mounting unit configured to rotate the mounted secondary battery around its longitudinal axis, a rear lighting unit configured to irradiate light toward the side of the secondary battery, a camera installed on the opposite side of the rear lighting unit with the secondary battery in between, a control unit configured to control the mounting unit and the camera so as to acquire an image of the secondary battery each time the secondary battery is rotated by a predetermined angle, and a calculation unit configured to extract coordinates of the outline of the secondary battery from the image of the secondary battery and reconstruct a 3D model.

[0006] Here, the rear lighting unit may be a backlight for the secondary battery, and the camera may be configured to capture a projection image of the secondary battery.

[0007] Meanwhile, the calculation unit receives information on the predetermined angle at which the secondary battery rotates from the control unit, and can reconstruct a three-dimensional model based on the diameter of the secondary battery and the coordinates of the contour of the secondary battery at each angle.

[0008] Meanwhile, the battery pack may further include a driving unit configured to rotate the secondary battery mounted in the mounting part around the length direction, and the control unit may control the driving unit to repeatedly adjust the angle of the mounting part by a predetermined angle up to a target angle of 360 degrees or less.

[0009] Meanwhile, the calculation unit may be configured to extract boundary information for each of the contours of both sides of the secondary battery from the image.

[0010] The rear lighting unit may also be configured to emit light from a surface.

[0011] On the other hand, the predetermined angle may be within 3 degrees.

[0012] Meanwhile, the camera may further include a coaxial illumination unit configured to irradiate light coaxially with the camera.

[0013] Meanwhile, the calculation unit can extract information on a first edge closest to the camera and information on a second edge farthest from the camera from the image to generate length information of the secondary battery.

[0014] Furthermore, the calculation unit can extract length information of the secondary battery and interval information between the first edge information and the second edge information, and correct the 3D model of the secondary battery using the interval information.

[0015] Furthermore, the present disclosure provides a 3D scanning method for a cylindrical secondary battery, including the steps of acquiring a projection image while irradiating light from behind the cylindrical secondary battery, extracting length information, outer diameter information, and side boundary information from the projection image by a calculation unit, and generating a 3D model of the secondary battery based on the extracted length information, outer diameter information, and boundary information by the calculation unit.

[0016] Meanwhile, the step of acquiring the projection image may be performed by taking an image every time the secondary battery is adjusted to a predetermined angle.

[0017] Meanwhile, the projected image may be acquired by rotating the cylindrical secondary battery around the longitudinal axis to a target angle of 360 degrees or less.

[0018] Meanwhile, in the step of extracting information, two pieces of boundary information according to the sides of the secondary battery can be extracted from the projection image.

[0019] In addition, in the step of generating the 3D model, a part of the cylindrical secondary battery may be 3D modeled based on boundary information extracted for each predetermined angle.

[0020] Also, the step of acquiring the projection image may be performed together with light irradiation by surface emission behind the secondary battery.

[0021] On the other hand, the predetermined angle may be within 3 degrees.

[0022] Meanwhile, the step of acquiring the projected image may be performed in a state where light coaxial with the camera is further irradiated.

[0023] Meanwhile, the step of extracting information may further include extracting, from the projection image, information on a distance between a first edge recognized by the coaxial light and a second edge recognized by the rear light on the upper and lower surfaces of the secondary battery.

[0024] Meanwhile, the method may further include calculating the angle of deviation of the secondary battery based on the length information and the interval information before the step of generating the 3D model.

[0025] Further, a 3D scanning and appearance inspection device for a cylindrical secondary battery may be provided, which includes: a mounting unit configured to be rotatable about a longitudinal axis; a rear lighting unit configured to irradiate light toward a side of the secondary battery; a camera provided on the opposite side of the rear lighting unit with the secondary battery interposed therebetween; a front lighting unit configured to irradiate light toward the side of the secondary battery; a controller configured to control the mounting unit and the camera to acquire an image of the secondary battery each time the secondary battery is rotated by a predetermined angle; and a computing unit configured to process images acquired from the camera, wherein the computing unit is configured to extract coordinates of an outline of the secondary battery from the angled images of the secondary battery to reconstruct a 3D model, and to extract a surface area of ​​the secondary battery from the angled images of the secondary battery to generate an inspection image.

[0026] On the other hand, the front lighting unit may be configured to be able to irradiate light at at least one different position along the length of the secondary battery.

[0027] The control unit may also be configured to control the mounting unit and the camera to capture a projection image each time the secondary battery rotates a first angle, and to control the front lighting unit and the camera to capture a side image each time the secondary battery rotates a second angle.

[0028] On the other hand, the first angle is characterized by being smaller than the second angle.

[0029] The calculation unit may also be configured to generate a partial inspection image by cropping and merging a partial area of ​​the side surface of the secondary battery from the multiple images acquired each time the secondary battery is rotated through the second angle.

[0030] The calculation unit may also be configured to combine the partial inspection images for each second angle to generate a complete side inspection image.

[0031] The battery may further include a defect detector configured to analyze an inspection image of a side surface of the secondary battery to detect an appearance defect.

[0032] Meanwhile, the calculation unit may be configured to extract coordinates of the boundaries of the side surfaces from the image and generate a three-dimensional model based on the angle of the secondary battery and the coordinates of the boundaries.

[0033] The calculation unit may also be configured to extract coordinates of pixels where the boundary appears in order to extract boundary coordinates of the side surface of the secondary battery from the image.

[0034] On the other hand, the control unit may set the first angle to be smaller than the second angle. [Effects of the Invention]

[0035] The cylindrical secondary battery 3D scanning and appearance inspection device according to the present invention has the effect of maximizing inspection efficiency by rotating the secondary battery and simultaneously performing 3D scanning and appearance inspection. [Brief explanation of the drawings]

[0036] [Figure 1] FIG. 1 is a perspective view of a 3D scanning device for a cylindrical secondary battery according to a first embodiment of the present disclosure. [Figure 2a] FIG. 2 is a diagram illustrating an operation state of the first embodiment. [Figure 2b] FIG. 2 is a diagram illustrating an operation state of the first embodiment. [Figure 3] FIG. 2 is a diagram showing an example of an image acquired in the first embodiment. [Figure 4] FIG. 4 is an enlarged view showing an area I in FIG. 3. [Figure 5a] FIG. 1 is a diagram illustrating the concept of modeling using three-dimensional coordinates. [Figure 5b]FIG. 1 is a diagram illustrating the concept of modeling using three-dimensional coordinates. [Figure 5c] FIG. 1 is a diagram illustrating the concept of modeling using three-dimensional coordinates. [Figure 5d] FIG. 1 is a diagram illustrating the concept of modeling using three-dimensional coordinates. [Figure 6] FIG. 10 is a perspective view of a 3D scanning device for a cylindrical secondary battery according to a second embodiment of the present disclosure. [Figure 7] FIG. 10 is a diagram showing an example of an image acquired in the second embodiment. [Figure 8] FIG. 8 is a diagram showing the concept of extracting coordinates from the I′ region in FIG. 7 to compensate for deviation in the second embodiment. [Figure 9] 10 is a flowchart of a 3D scanning method for a cylindrical secondary battery according to a third embodiment of the present disclosure. [Figure 10] 10 is a flowchart of a 3D scanning method for a cylindrical secondary battery according to a fourth embodiment of the present disclosure. [Figure 11] FIG. 10 is a perspective view of a 3D scanning and appearance inspection device for a cylindrical secondary battery according to a fifth embodiment of the present disclosure. [Figure 12] FIG. 10 is a diagram showing a front illumination unit in a fifth embodiment of the present disclosure. [Figure 13a] 13A and 13B are diagrams illustrating an operating state of a forward lighting unit in a fifth embodiment of the present disclosure. [Figure 13b] 13A and 13B are diagrams illustrating an operating state of a forward lighting unit in a fifth embodiment of the present disclosure. [Figure 13c] 13A and 13B are diagrams illustrating an operating state of a forward lighting unit in a fifth embodiment of the present disclosure. [Figure 14a] 13A and 13B are diagrams illustrating other operating states of the forward lighting unit in the fifth embodiment of the present disclosure. [Figure 14b] 13A and 13B are diagrams illustrating other operating states of the forward lighting unit in the fifth embodiment of the present disclosure. [Figure 14c] 13A and 13B are diagrams illustrating other operating states of the forward lighting unit in the fifth embodiment of the present disclosure. [Figure 15]FIG. 13 is a conceptual diagram illustrating the concept of generating a partial inspection image in a fifth embodiment of the present disclosure. [Figure 16] FIG. 13 is a conceptual diagram showing the concept of generating an inspection image in the fifth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, a 3D scanning device and a 3D scanning method for a cylindrical secondary battery according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments, the names of the components may be different in the art. However, if there is functional similarity or identity between the components, modified embodiments may be considered equivalent. Furthermore, reference numerals are used for convenience of explanation. However, the illustrations in the drawings in which these reference numerals are used do not limit the scope of the components within the drawings. Similarly, even if an embodiment is adopted in which some of the components in the drawings are modified, if there is functional similarity or identity between the components, they may be considered equivalent. Furthermore, if a component is recognized as something that should be included in the present embodiment by a person of ordinary skill in the art, a description of such a component will be omitted.

[0038] FIG. 1 is a perspective view of a 3D scanning device 1 for a cylindrical secondary battery 1000 according to a first embodiment of the present disclosure.

[0039] As shown in FIG. 1, the 3D scanning device 1 for a cylindrical secondary battery 1000 according to the first embodiment of the present disclosure may include a mounting unit 100, a driving unit (not shown), a rear lighting unit 200, a camera 300, a control unit (not shown), and a calculation unit (not shown).

[0040] The 3D scanning device 1 for a cylindrical secondary battery 1000 according to the first embodiment of the present disclosure is configured to acquire an image of the projected outline of the secondary battery 1000 while irradiating the secondary battery 1000 with light from behind.

[0041] The mounting unit 100 is configured to mount the cylindrical secondary battery 1000 in a horizontal position. The mounting unit 100 may be configured to be positioned within a projection area of ​​the secondary battery 1000 when the camera 300 takes an image. In other words, the mounting unit 100 may be configured not to appear in the image when the camera 300 takes an image.

[0042] The driving unit is configured to rotate the cylindrical secondary battery 1000 mounted on the mounting unit 100 around its longitudinal axis. Here, the driving unit is configured to repeatedly adjust the angle of the secondary battery 1000 to a predetermined angle. The driving unit may be configured to rotate the secondary battery 1000 by 0.1 to 3 degrees per drive.

[0043] The rear lighting unit 200 and the camera 300 may be installed in opposite directions around the mounting unit 100. The rear lighting unit 200 is configured to irradiate light toward the secondary battery 1000 mounted on the mounting unit 100. The rear lighting unit 200 is configured to emit light from a surface. That is, the rear lighting unit 200 can function as a backlight for the secondary battery 1000.

[0044] The camera 300 is configured to capture a projected image while light irradiated by the backlight unit 200 is blocked by the secondary battery 1000. The camera 300 is configured as an area camera and can capture a planar image.

[0045] Meanwhile, although not shown, the 3D scanning device 1 for the cylindrical secondary battery 1000 according to the first embodiment of the present disclosure may be configured to further include a control unit and a calculation unit.

[0046] The control unit is configured to control the overall operation of the device. Specifically, it is configured to synchronize the operation of the backlight unit 200 and the operation of the camera 300. It is also configured to control the driving unit to adjust the angle of the secondary battery 1000. Therefore, the camera 300 is configured to capture an image with the backlight activated every time the angle of the secondary battery 1000 changes.

[0047] The calculation unit is configured to extract boundary coordinates from a plurality of images acquired by the camera 300 and perform 3D modeling. The dimensions of the secondary battery 1000 to be 3D scanned may be input to the calculation unit in advance. That is, information regarding the values ​​of the outer diameter and length of the secondary battery 1000 may be determined in advance during the manufacturing stage and input to an embodiment according to the present disclosure.

[0048] The calculation unit can perform modeling by modifying the scale of the coordinates identified from the image based on information of the secondary battery 1000 input in advance.

[0049] 2a and 2b are diagrams showing the operation of the first embodiment, in which only the position of the secondary battery 1000 and the rear lighting unit 200 are shown for the sake of convenience.

[0050] As shown in FIG. 2a, in the first embodiment of the present disclosure, the backlight unit 200 is activated while the secondary battery 1000 is stopped, and an image is acquired. At this time, a projection image of the secondary battery 1000 is acquired. The coordinates (P1, P2) of the furthest points on the curved side can be confirmed from the projection image. The boundary coordinates of the top and bottom surfaces can also be confirmed.

[0051] As shown in Figure 2b, the control unit rotates the secondary battery 1000 by a predetermined angle and then activates the backlight unit 200 to capture an image. At this time, when the secondary battery 1000 is projected, the coordinates projected and acquired at the side boundaries are coordinates spaced at 180-degree intervals (P3, P4). The scanning device 1 according to the present disclosure rotates the secondary battery 1000 by 180 degrees by repeating the process shown in Figures 2a and 2b several times to several hundred times. As the secondary battery 1000 rotates 180 degrees, coordinates are extracted from the parallel boundaries on both sides, making it possible to extract coordinates for the entire side of the secondary battery 1000, which corresponds to 360 degrees.

[0052] FIG. 3 is a diagram showing an example of an image acquired in the first embodiment.

[0053] As shown in Figure 3, in the first embodiment, when a projection image of the secondary battery 1000 is captured with the backlight turned on, a simple image can be captured. At this time, a coordinate (PθR) can be extracted at the right boundary according to the rotation angle (θ) extracted from the side boundary shown at the top of Figure 3. Also, a coordinate (PθL) can be extracted at the left boundary.

[0054] FIG. 4 is an enlarged view of region I in FIG.

[0055] As shown in Figure 4, the calculation unit determines the coordinates of the boundary portion for each pixel in the image acquired at a first angle (θ1). When viewing the area (I) enlarged at the first angle, the right boundary line can be identified for each pixel. The x and y coordinates can be identified for each pixel. The calculation unit extracts boundary coordinates in pixel units from the right and left boundary lines for each acquired image. This boundary coordinate extraction process by the calculation unit can be performed for multiple images.

[0056] For example, when the control unit rotates the secondary battery 1000 by one degree at a time, 180 images can be acquired by the camera 300. The calculation unit extracts the coordinates of the left and right boundaries from each of the 180 images.

[0057] 5a, 5b, 5c and 5d are diagrams showing the concept of modeling using three-dimensional coordinates.

[0058] As shown in Figure 5a, the calculation unit extracts boundary coordinates at the first angle. The extracted coordinates can be displayed three-dimensionally as shown in Figure 5a. At the first angle, the coordinates extracted from the right boundary (P 1R In addition, the coordinates extracted from the left boundary can also appear in the 3D space. At this time, the scale of the 3D space can be adjusted and displayed according to the diameter of the secondary battery 1000 that was previously input. The scale adjustment is performed by matching the extracted coordinates with a rotating coordinate system according to the radius (D / 2) and rotation angle from the rotation center of the secondary battery 1000.

[0059] As shown in FIG. 5b, when the secondary battery 1000 is placed at the second angle, the coordinates (P 1R (x,y),P 2R (x,y) appears in 3D space, as do the coordinates extracted from the left boundary at 180 degree intervals.

[0060] As shown in FIG. 5c, the process described in FIG. 5a and FIG. 5b is repeated to generate three-dimensional coordinates along the rotation angle. The extracted coordinates (P 1R (x,y), P 2R (x,y), P 3R (x,y), P 4R (x, y) can be displayed at positions spaced apart from the central axis by a predetermined angle (the rotation angle of the secondary battery 1000).

[0061] As shown in FIG. 5d, the calculation unit can complete the coordinate extraction process even if the secondary battery 1000 is rotated by 180 degrees, and generate 3D data for 360 degrees.

[0062] As described above, in the present disclosure, 3D scanning of the secondary battery 1000 can be performed by generating a 3D model using coordinates extracted from a projected image. In this case, coordinates can be extracted from an image acquired using one camera 300, and 3D data merging can be performed on the extracted coordinates, thereby simplifying the equipment.

[0063] However, in this embodiment, an example of generating three-dimensional data by rotating 180 degrees has been described, but it may also be possible to modify this to a method of generating three-dimensional data by rotating the secondary battery 1000 by more than 360 degrees.

[0064] In addition, although this embodiment has been described using the example of photographing one cylindrical battery, this is merely an example, and the scanning device 1 according to the present disclosure can also be modified and implemented to rotate and photograph various numbers of secondary batteries 1000 simultaneously.

[0065] The calculation unit can use the generated three-dimensional information of the secondary battery 1000 to detect defects in appearance, etc.

[0066] A 3D scanning device 1 for a cylindrical secondary battery 1000 according to a second embodiment of the present disclosure will be described below with reference to Figures 6 to 8. This embodiment may be configured to include the same components as those in the first embodiment described above, and descriptions of the same components will be omitted to avoid duplication, and different components will be described in detail.

[0067] Due to the cylindrical geometry, if there is no coaxial illumination, the image is acquired symmetrically, making it impossible to determine in which direction the secondary battery 1000 is tilted. Furthermore, the coordinates of the side surfaces may appear the same on the projected image despite the tilt. Therefore, the second embodiment is configured to determine the tilt of the secondary battery 1000 and generate a 3D model based on the tilt to correct it.

[0068] FIG. 6 is a perspective view of a 3D scanning device 1 for a cylindrical secondary battery 1000 according to a second embodiment of the present disclosure.

[0069] 6, the 3D scanning device 1 for a cylindrical secondary battery 1000 according to the second embodiment of the present disclosure may further include a mirror unit 500 and a coaxial illumination unit 400. The coaxial illumination unit 400 may include a beam splitter and an illumination module.

[0070] The mirror unit 500 is provided in an area photographed by the camera 300 , and the camera 300 can obtain a projected image of the secondary battery 1000 that is reflected by the mirror unit 500 .

[0071] The coaxial lighting unit 400 is configured to be able to irradiate light onto the side surface of the secondary battery 1000 that is to be photographed by the camera 300 .

[0072] The control unit is configured to control the coaxial lighting unit 400, the rear lighting unit 200, the camera 300, and the driving unit. The control unit can control the camera 300 to capture an image in a state where the coaxial lighting unit 400 and the rear lighting unit 200 simultaneously irradiate light toward the secondary battery 1000.

[0073] In this embodiment, information on the boundary obtained by irradiating light from behind the secondary battery 1000 and the boundary of the half side surface facing the camera 300 can be extracted. If the boundary coordinates of the front and rear surfaces are different from each other, the calculation unit can calculate information on the deviation and correct the 3D model information based on the calculated deviation information.

[0074] However, although this embodiment shows a configuration in which the mirror unit 500 is added, it may be possible to omit the mirror unit.

[0075] FIG. 7 is a diagram showing an example of an image acquired in the second embodiment.

[0076] As shown in FIG. 7, in the second embodiment, the boundary with respect to the front surface (surface from which the camera 300 is viewed) of the secondary battery 1000 can be confirmed by using coaxial lighting.

[0077] Therefore, in this embodiment, light is irradiated using coaxial lighting and an image is acquired. The calculation unit can extract edge coordinates from the top or bottom surface of the acquired image, from which the camera 300 views the image.

[0078] FIG. 8 is a diagram showing the concept of extracting coordinates from the I' region in FIG. 7 to compensate for the deviation in the second embodiment.

[0079] 8, the calculation unit extracts the coordinate (Pe1) of the first edge that is closest to the camera 300 from among the coordinates confirmed by the coaxial lighting unit 200. Also, the calculation unit extracts the coordinate (Pe2) of the second edge that is farthest from the camera 300 from among the coordinates confirmed by the rear lighting unit 200. At this time, the coordinate that is closest or farthest from the camera 300 can be selected as the coordinate of the boundary that intersects the left and right central axes.

[0080] The calculation unit calculates the degree of tilt of the secondary battery 1000 toward the camera 300 using the diameters of the upper and lower surfaces of the secondary battery 1000 and the distance between the first and second edges, which are input in advance. Based on this, the 3D data of the secondary battery 1000 described in the first embodiment is corrected based on the angle of the secondary battery 1000.

[0081] Hereinafter, the 3D scanning method for a cylindrical secondary battery according to the third embodiment of the present disclosure will be described in detail with reference to FIG.

[0082] FIG. 9 is a flowchart of a 3D scanning method for a cylindrical secondary battery according to a third embodiment of the present disclosure.

[0083] As shown in FIG. 9, the 3D scanning method for a cylindrical secondary battery according to the third embodiment of the present disclosure may include a step of acquiring a projection image while irradiating light from behind the cylindrical secondary battery (S110), a step of extracting length information, outer diameter information, and side boundary information from the projection image (S120), and a step of generating a 3D model of the secondary battery (S130).

[0084] The step of capturing a projection image while irradiating light from behind the cylindrical secondary battery (S110) is performed by irradiating light from behind the secondary battery and capturing an image using a camera on the opposite side. This step is repeatedly performed while rotating the secondary battery by a predetermined angle. That is, tens to hundreds of images of the secondary battery can be captured through this step.

[0085] The step of extracting length information, outer diameter information, and side boundary information from the projection image (S120) corresponds to a step of extracting boundary coordinates from the projection image and extracting length information, outer diameter information, and side boundary information of the secondary battery. The projection image can be acquired with the secondary battery fixed in the same position. Therefore, the pixel size confirmed from the image can be matched with the actual size based on a pre-input reference value. Based on this, information on the length and outer diameter of the secondary battery can be extracted, and boundary information (two lines) for the side can be extracted.

[0086] The step of generating a 3D model of the secondary battery (S130) corresponds to a step of performing 3D modeling based on the extracted length information, outer diameter information, and side boundary information. This step extracts coordinates while rotating the cylindrical battery, and reconstructs the extracted side boundary coordinates for each predetermined angle in 3D.

[0087] Hereinafter, a 3D scanning method for a cylindrical secondary battery according to a fourth embodiment of the present disclosure will be described with reference to FIG.

[0088] FIG. 10 is a flowchart of a 3D scanning method for a cylindrical secondary battery according to a fourth embodiment of the present disclosure.

[0089] In this embodiment, the projected image refers to an image captured under the condition that light is irradiated from behind and from the front at the same time.

[0090] 10, a 3D scanning method for a cylindrical secondary battery according to a fourth embodiment of the present disclosure may include acquiring a projection image while irradiating a cylindrical secondary battery with light coaxially with the rear of the cylindrical secondary battery and a camera (S210), extracting length information, outer diameter information, spacing information, and side boundary information from the projection image (S220), calculating a deviation angle of the secondary battery (S230), and generating a 3D model (S240). Here, the steps of extracting information and generating a 3D model may be performed by a calculation unit including a processor.

[0091] The step of acquiring a projection image in a state where light is irradiated from behind the cylindrical secondary battery and coaxially with the camera (S210) corresponds to a step of acquiring an image by irradiating light from the front and rear of the secondary battery.

[0092] The step of extracting length information, outer diameter information, spacing information, and side boundary information from the projection image (S220) corresponds to a step of processing the image and extracting pixel coordinates corresponding to the boundary. In this step, the edge of the upper or lower surface can be confirmed by irradiating light from the front of the secondary battery.

[0093] In particular, if the secondary battery is tilted relative to the camera, the coordinates of the top or bottom edge, which are seen when light is irradiated from the front, and the coordinates of the top or bottom edge, which are seen when light is irradiated from the back, can be simultaneously confirmed. In this case, the calculation unit analyzes the image to extract the coordinates of the edge farthest from the camera and the coordinates of the edge closest to the camera, and extracts the interval information between these two coordinates. However, if the secondary battery is positioned squarely toward the camera and not misaligned, these interval coordinates may not be extracted, and the interval information may be 0.

[0094] The step of calculating the angle of deviation of the secondary battery (S230) is a step of calculating how much the secondary battery is relatively deviated from the camera using the outer diameter information and the interval information of the secondary battery.

[0095] The step of generating a 3D model (S240) corresponds to a step of correcting the 3D modeling of the side of the secondary battery based on the angle deviation of the secondary battery. This step makes it possible to easily grasp the angle deviation even when the secondary battery is not positioned in a fixed position facing the camera. In addition, it is possible to generate an accurate 3D model based on the angle deviation of the secondary battery.

[0096] As described above, the 3D scanning device and 3D scanning method for a cylindrical secondary battery according to the present disclosure can reconstruct an accurate 3D model of a cylindrical secondary battery with a simple configuration equipped with one camera.

[0097] A 3D scanning and visual inspection device for a secondary battery according to a fifth embodiment of the present disclosure will be described in detail below with reference to Figures 11 to 16. The following embodiment also includes the same components as the previous embodiment, and the description of the same components will be omitted to avoid duplication, and different configurations will be described.

[0098] FIG. 11 is a perspective view of a 3D scanning and appearance inspection device for a cylindrical secondary battery according to a fifth embodiment of the present disclosure, and FIG. 12 is a diagram showing a front lighting unit in the fifth embodiment of the present disclosure.

[0099] 11 and 12, the 3D scanning and appearance inspection apparatus for a cylindrical secondary battery according to the fifth embodiment of the present disclosure includes a front illumination unit 600. The front illumination unit 600 may be configured to be coaxial with the camera and to irradiate light toward the secondary battery. The front illumination unit 600 may include a beam splitter 620 and a front illumination module 610. The beam splitter may be provided at a point where the optical axes of the camera and the front illumination module 610 intersect.

[0100] The front lighting module 610 may include a plurality of lighting units 611, 612, ..., 618. The plurality of lighting units may be provided sequentially along the length direction of the secondary battery. Each lighting unit may be configured with a predetermined width. Furthermore, each lighting unit 611, 612, ..., 618 may be configured to be independently controlled by a control unit. Although an example in which the front lighting module 610 is configured with eight lighting units is shown, this is merely an example, and the front lighting module 610 may be configured with various numbers of lighting units.

[0101] In a fifth embodiment of the present disclosure, the control unit may control the secondary battery to rotate at predetermined angular intervals. The control unit may control the camera to acquire a projected image for 3D scanning each time the secondary battery is rotated by a first angle. The control unit may also control the camera to acquire a surface image each time the secondary battery 1000 is rotated by a second angle. The control unit may determine the first angle to be smaller than the second angle. That is, the images captured for 3D scanning may be controlled so that coordinates can be extracted more frequently to generate a precise 3D model.

[0102] The calculation unit can extract boundary coordinates of the side surface of the secondary battery from the acquired projection image and generate a 3D model based on the boundary coordinates. However, in connection with the generation of the 3D model by the calculation unit, the functions or methods described in the first to fourth embodiments may be used.

[0103] Although this embodiment shows a configuration in which the mirror unit 500 is added, the mirror unit may be omitted.

[0104] In this embodiment, the computing unit can capture images of the side of the secondary battery from different angles and combine them to generate an inspection image. The appearance inspection unit can analyze the generated inspection image to detect defects on the side of the secondary battery. Examples of defects include scratches, dents, dirt, foreign matter, and electrolyte leakage.

[0105] 13a, 13b, and 13c are diagrams showing the operating state of the forward lighting unit in the fifth embodiment of the present disclosure, and FIGS. 14a, 14b, and 14c are diagrams showing other operating states of the forward lighting unit in the fifth embodiment of the present disclosure.

[0106] As shown in Figures 13a, 13b, and 13c, the front lighting module 610 includes multiple lighting units, each of which is arranged consecutively along the length of the secondary battery. In this case, two adjacent lighting units in a given area may be controlled to operate simultaneously. Two adjacent lighting units may be controlled in the order of Figures 13a, 13b, and 13c. That is, the first lighting unit 611 and the second lighting unit 612 may be activated first, followed by the third lighting unit 613 and the fourth lighting unit 614. Finally, the fifth lighting unit 615 and the sixth lighting unit 616 may be activated. The camera captures an image each time the lighting operation positions are phase-shifted.

[0107] As shown in Figures 14a, 14b, and 14c, the front lighting module can operate in various patterns and with a phase shift. As shown in Figure 14a, the first lighting unit 611 and the fifth lighting unit 615 can operate simultaneously. Then, as shown in Figure 14b, the second lighting unit 612 and the sixth lighting unit 616 can operate simultaneously so that the operating lighting units are phase-shifted. Then, as shown in Figure 14c, the third lighting unit 613 and the seventh lighting unit 617 can operate simultaneously. In this way, the camera operates to capture an image of the rechargeable battery each time the phase of the front lighting module is shifted.

[0108] However, the configuration of the front lighting module described in Figures 13a to 14c is merely an example, and various numbers and patterns may be configured. That is, they may be arranged in a 1xN or NxM configuration. Furthermore, the pattern in which the lighting units operate may be modified and operated in various patterns that allow phase shifting.

[0109] FIG. 15 is a conceptual diagram showing the concept of generating a partial inspection image in the fifth embodiment of the present disclosure.

[0110] As shown in Figure 15, the front lighting module can be cycled once when the secondary battery is stopped. During one cycle, the camera can capture images by shifting the operating position of the lighting unit.

[0111] Therefore, it is possible to acquire images of the secondary battery at a specific angle for the number of phase shifts. For example, in Figure 15, when the secondary battery is at a first angle, it is possible to acquire a first phase image (I1-1), a second phase image (I1-2), and a third phase image (I1-3).

[0112] The calculation unit crops and extracts the flattest area from the three images, where the flattest area may be the central area on the image.

[0113] The calculation unit can combine the extracted regions to generate a partial inspection image (i1). This partial inspection image is generated based on the image acquired by the front lighting module after phase shifting, so information about the partial heights of the surface is accurately displayed. In other words, when the calculation unit generates the partial inspection image (i1), an image with depth information displayed on a plane like 2.5D can be obtained.

[0114] Meanwhile, the process of generating the partial inspection image described above is exemplified as being generated based on three images acquired according to three illumination phases, but this is merely an example, and the camera may be controlled to acquire multiple images according to several or even several tens of phases.

[0115] The control unit can activate the front lighting unit and the camera each time the secondary battery is rotated to the second angle, and the calculation unit can generate a partial inspection image each time the secondary battery is rotated to the second angle.

[0116] FIG. 16 is a conceptual diagram showing the concept of generating an inspection image in the fifth embodiment of the present disclosure.

[0117] As shown in Figure 16, in this embodiment, the calculation unit can generate partial inspection images (I1, I2, ..., In) for each second angle. This process is repeated until the secondary battery rotates 360 degrees. A partial inspection image acquired at one angle can be merged with a partial inspection image at the next angle at an adjacent position. Finally, the calculation unit can generate an inspection image (I side) in which the side of the secondary battery is completely visible.

[0118] Meanwhile, although not shown, a defect detector can detect appearance defects on the side of the secondary battery based on the inspection image.

[0119] However, in the fifth embodiment, the control unit rotates the secondary battery, acquires a projection image for each first angle, extracts the outline, and acquires a surface image for each second angle. At this time, at least one of the projection image and the surface image can be acquired depending on the size of the first angle and the second angle. That is, in some cases, only a projection image is acquired when the secondary battery is at a certain angle, and only a surface image is acquired at another angle. In other words, in some cases, a projection image and a surface image of the secondary battery can be acquired simultaneously.

[0120] As described above, the cylindrical secondary battery 3D scanning and appearance inspection device according to the present disclosure has the effect of maximizing inspection efficiency by rotating the secondary battery and simultaneously performing 3D scanning and appearance inspection. [Explanation of symbols]

[0121] 1: 3D scanning device for cylindrical secondary batteries 100: Landing section 200: Rear lighting section 300: Camera 400: Coaxial lighting section 500: Mirror section 600: Front lighting section 1000: Secondary battery

Claims

1. a seating portion configured to allow the seated secondary battery to rotate about a longitudinal axis; a rear lighting unit configured to irradiate light toward a side surface of the secondary battery; a camera provided on the opposite side of the rear lighting unit with the secondary battery interposed therebetween; a control unit configured to control the seating unit and the camera so as to capture an image of the secondary battery each time the secondary battery is rotated by a predetermined angle; and a calculation unit configured to extract coordinates of an outline of the secondary battery from the image of the secondary battery and reconstruct a three-dimensional model; the rear lighting unit is a backlight for the secondary battery, the camera is configured to acquire a projection image of the secondary battery; The calculation unit receiving information about the predetermined angle of rotation of the secondary battery from the control unit; adjusting a scale of the three-dimensional space based on a diameter of the secondary battery; A 3D scanning device for a cylindrical secondary battery that reconstructs the three-dimensional model based on coordinates of the contour of the secondary battery for each angle.

2. a driving unit configured to rotate the secondary battery mounted on the mounting unit around a length direction, The control unit The 3D scanning device for cylindrical secondary batteries according to claim 1 , wherein the driving unit is controlled to repeatedly adjust the angle of the seating unit by the predetermined angle up to a target angle of 360 degrees or less.

3. The calculation unit The 3D scanning device for cylindrical secondary batteries according to claim 2 , configured to extract boundary information for each of the contours of both side surfaces of the secondary battery from the image.

4. The 3D scanning device for cylindrical secondary batteries according to claim 3 , wherein the rear lighting unit is configured to emit light from a surface.

5. The 3D scanning device for cylindrical secondary batteries according to claim 4 , wherein the predetermined angle is within 3 degrees.

6. The 3D scanning device for cylindrical secondary batteries according to claim 1 , further comprising a coaxial lighting unit configured to irradiate light coaxially with the camera.

7. The calculation unit The 3D scanning device for cylindrical secondary batteries according to claim 6 , wherein the tilt angle of the secondary battery is determined by extracting first edge information closest to the camera and second edge information furthest from the camera from the image.

8. The calculation unit extracting information about the inclination angle using information about a distance between the first edge information and the second edge information; The 3D scanning device for cylindrical secondary batteries according to claim 7 , wherein 3D model information of the secondary battery is corrected based on the information on the tilt angle.

9. a seating portion configured to allow the seated secondary battery to be rotated around a longitudinal axis; a rear lighting unit configured to irradiate light toward a side surface of the secondary battery; a camera provided on the opposite side of the rear lighting unit with the secondary battery interposed therebetween; a front lighting unit configured to irradiate light toward a side surface of the secondary battery; a control unit configured to control the seating unit and the camera to capture an image of the secondary battery each time the secondary battery is rotated by a predetermined angle; and a computing unit configured to process images acquired from the camera; The forward lighting unit The secondary battery is configured so that light can be irradiated from at least one different position along the length direction of the secondary battery, The control unit The mounting unit, the rear lighting unit, and the camera are controlled to capture a projection image each time the secondary battery rotates through a first angle; The mounting unit, the front lighting unit, and the camera are controlled to capture a side image each time the secondary battery rotates at a second angle; The calculation unit a configuration in which coordinates of an outline of the secondary battery are extracted from the images of the secondary battery at different angles, and a three-dimensional model is reconstructed; The cylindrical secondary battery 3D scanning and appearance inspection device is configured to extract a surface area of ​​the secondary battery from angle-specific images of the secondary battery to generate an inspection image.

10. The cylindrical secondary battery 3D scanning and visual inspection device according to claim 9 , wherein the first angle is smaller than the second angle.

11. The calculation unit 11. The 3D scanning and appearance inspection device for cylindrical secondary batteries according to claim 10, configured to generate a partial inspection image by cropping and merging a partial area of ​​the side of the secondary battery in multiple images acquired each time the secondary battery rotates at a second angle.

12. The calculation unit The cylindrical secondary battery 3D scanning and appearance inspection device of claim 11 , configured to generate a complete side inspection image by combining the partial inspection images for each of the second angles.

13. The cylindrical secondary battery 3D scanning and visual inspection device of claim 12 , further comprising a defect detection unit configured to analyze an inspection image of a side surface of the secondary battery to detect visual defects.

14. The calculation unit extracting the coordinates of the side boundaries from said image; The cylindrical secondary battery 3D scanning and appearance inspection device according to claim 9 , configured to generate a three-dimensional model based on the angle of the secondary battery and the coordinates of the boundary.

15. The calculation unit The cylindrical secondary battery 3D scanning and appearance inspection device according to claim 14 , configured to extract coordinates of pixels where the boundary appears in order to extract boundary coordinates of the side surface of the secondary battery from the image.

16. The cylindrical secondary battery 3D scanning and visual inspection device according to claim 9 , wherein the control unit sets the first angle to be smaller than the second angle.

Images