Tab detection system and method
Through the ultra-ear detection system combined with liquid lens and prism, the problems of unclear image fusion and space limitations in ultra-ear detection are solved, and efficient and accurate ultra-ear appearance defect detection is achieved.
Patent Information
- Application Number
- CN202410146116.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-01
- Publication Date
- 2025-08-01
AI Technical Summary
The prior art has problems such as unclear image fusion, mechanical vibration and space limitations in polar ear detection, resulting in low detection efficiency.
The extreme ear detection system is used to coordinate a liquid lens and a prism. The focal length is adjusted based on the voltage signal through the liquid lens, combined with prism imaging and light source module lighting, to achieve the acquisition and fusion of multiple images, avoiding mechanical vibration and space limitations.
It realizes efficient detection of extreme ear appearance defects, improves detection accuracy and efficiency, simplifies the equipment structure, and reduces maintenance difficulty.
Smart Images
Figure CN120404769A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of visual inspection, and particularly to an ear tab detection system and method. Background Art
[0002] During the production of batteries, the winding process is required to wind the cathode, anode, and separator together to form a bare battery cell. However, the bare battery cells produced in this process may have appearance defects such as ear tab folding, ear tab misalignment, ear tab missing, and ear tab cracking, which have a certain impact on the safety of the battery.
[0003] Therefore, a solution for detecting the appearance defects of ear tabs is needed. Summary of the Invention
[0004] This application provides an ear tab detection system and method, which can realize the detection of the appearance defects of ear tabs.
[0005] In a first aspect, this application provides an ear tab detection system, including: a host computer electrically connected to a camera provided with a liquid lens, the host computer being configured to output a plurality of voltage signals to the liquid lens and send an image acquisition signal to the camera when the battery cell assembly reaches the ear tab detection station; the liquid lens being configured to adjust its own focal length based on each voltage signal; the camera being configured to, based on the image acquisition signal, after each adjustment of the focal length of the liquid lens, collect a first image of the ear tab of the battery cell assembly through the liquid lens, obtain a plurality of first images, and send the plurality of first images to the host computer; the host computer is further configured to fuse the plurality of first images into a second image, and perform appearance defect detection on the ear tab based on the second image to obtain a detection result.
[0006] Thus, when the battery cell assembly reaches the ear tab detection station, the host computer can output a plurality of voltage signals to the liquid lens and send an image acquisition signal to the camera. The liquid lens can adjust its own focal length based on each voltage signal. The camera can, based on the image acquisition signal, after each adjustment of the focal length of the liquid lens, collect a first image of the ear tab of the battery cell assembly through the liquid lens, obtain a plurality of first images, and send the plurality of first images to the host computer. Then the host computer can fuse the plurality of first images into a second image and perform appearance defect detection on the ear tab based on the second image to obtain a detection result. In this way, the detection of the appearance defects of ear tabs can be realized.
[0007] In some embodiments, the focal length of the liquid lens has a linear relationship with the voltage signal, and the liquid lens is configured to determine the focal length based on each voltage signal and the linear relationship to obtain a plurality of target focal lengths, and adjust its own focal length based on each target focal length.
[0008] In this way, by using a liquid lens with a linear relationship between the focal length and the voltage signal, the zoom of the liquid lens can be controlled more conveniently and accurately.
[0009] In some embodiments, the system also includes: a prism electrically connected to a host computer for imaging the tab; the host computer is also used to control the prism to move to the tab area of the battery cell assembly when the battery cell assembly arrives at the inspection station; the camera is used to capture the image of the tab in the prism through the liquid lens after each focal length adjustment of the liquid lens to obtain multiple first images.
[0010] In this way, the image of the tab can be obtained by collecting the image of the tab in the prism without directly photographing the tab, which can save space and solve the problem that the camera cannot enter a narrow space to collect images.
[0011] In some embodiments, the system further includes: a light source module electrically connected to a host computer; the host computer is further configured to control the light source module to light up when the battery cell assembly arrives at the inspection station; and a camera configured to capture the image of the tab in the prism through a liquid lens when the tab is illuminated by the light source module.
[0012] In this way, by illuminating the tab with the light source module, a clearer image of the tab can be captured.
[0013] In some embodiments, the prism includes a reflective area, and the reflective area is used to reflect the first light reflected by the tab to the camera.
[0014] In this way, the prism can form an image of the tab, and the camera can capture the image of the tab in the prism to obtain the tab image.
[0015] In some embodiments, the second light emitted by the light source module is projected onto the tab; the camera is used to capture the position of the tab illuminated by the second light to obtain a first image.
[0016] In this way, the second light emitted by the light source module is projected onto the tab, and the tab can be illuminated by the second light. The camera can capture the position of the tab illuminated by the second light to obtain a clear image of the tab.
[0017] In a second aspect, the present application provides a tab detection method, comprising: when a battery cell assembly arrives at a detection station, outputting multiple voltage signals to a liquid lens through a host computer, so that the liquid lens adjusts its own focal length based on each voltage signal; sending an image acquisition signal to a camera through the host computer, so that the camera collects a first image of the tab of the battery cell assembly through the liquid lens after each adjustment of the focal length of the liquid lens based on the image acquisition signal, thereby obtaining multiple first images; fusing the multiple first images into a second image through the host computer, and performing appearance defect detection on the tab based on the second image to obtain a detection result.
[0018] Thus, when the upper computer determines that the battery cell assembly has reached the ear detection station, it can output multiple voltage signals to the liquid lens and send an image acquisition signal to the camera. The liquid lens can adjust its focal length based on each voltage signal. After each adjustment of the focal length by the liquid lens, the camera can collect a first image of the ears of the battery cell assembly through the liquid lens, obtaining multiple first images, and send the multiple first images to the upper computer. Then, the upper computer can fuse the multiple first images into a second image and perform appearance defect detection on the ears based on the second image to obtain a detection result. In this way, the detection of appearance defects of the ears can be achieved.
[0019] In some embodiments, before sending the image acquisition signal to the camera through the upper computer, the method further includes: when the battery cell assembly reaches the detection station, the upper computer controls the prism to move to the ear area of the battery cell assembly; the prism is used to image the ears; after each adjustment of the focal length by the liquid lens, the camera collects the image of the ears in the prism through the liquid lens to obtain a first image.
[0020] In this way, an ear image can be obtained by collecting the image of the ears in the prism without directly photographing the ears, which can save space and solve the problem that the camera cannot enter a narrow space to collect images.
[0021] In some embodiments, before sending the image acquisition signal to the camera through the upper computer, the method further includes: when the battery cell assembly reaches the detection station, the upper computer controls the light source module to light up; the light source module is used to illuminate the ears; when the ears are illuminated by the light source module, the camera collects the image of the ears in the prism through the liquid lens.
[0022] In this way, by illuminating the ears with the light source module, a clearer ear image can be collected.
[0023] In some embodiments, fusing the multiple first images into a second image by the upper computer includes: the upper computer divides the multiple first images into multiple regions according to a preset method to obtain multiple regions corresponding to each first image; for each region among the multiple regions, the upper computer respectively performs: determining the clarity of the region in each first image; determining the target region corresponding to the highest clarity from the regions corresponding to the multiple first images; the upper computer fuses the target regions corresponding to each region among the multiple regions into a second image.
[0024] In this way, multiple images with unclear regions can be fused into a clear image, and more accurate ear detection can be performed based on the clear image.
[0025] The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Description of the Drawings
[0026] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:
[0027] Figure 1 It is a schematic diagram of a battery cell provided in some embodiments of the present application;
[0028] Figure 2 It is one of the schematic diagrams of an existing image acquisition device provided in some embodiments of the present application;
[0029] Figure 3 It is another schematic diagram of an existing image acquisition device provided in some embodiments of the present application;
[0030] Figure 4 It is a schematic diagram of pixel point offset provided in some embodiments of the present application;
[0031] Figure 5 It is a schematic diagram of an ear image provided in some embodiments of the present application;
[0032] Figure 6 It is one of the schematic diagrams of an ear detection system provided in some embodiments of the present application;
[0033] Figure 7 It is a schematic diagram of the zoom principle of a liquid lens provided in some embodiments of the present application;
[0034] Figure 8 It is another schematic diagram of an ear detection system provided in some embodiments of the present application;
[0035] Figure 9 It is one of the flowcharts of an ear detection method provided in some embodiments of the present application;
[0036] Figure 10 It is another flowchart of an ear detection method provided in some embodiments of the present application.
[0037] In the drawings, the drawings are not necessarily drawn to actual scale. Detailed Embodiments
[0038] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.
[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.
[0040] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.
[0041] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.
[0042] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.
[0043] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).
[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0045] As described in the background art, in the post-process production of square shell batteries, first, a winding process is required to wind the cathode, anode, and separator together to form a bare battery cell. However, the bare battery cells produced in this process may have defects such as ear folding, ear misalignment, ear missing, and ear cracking, which have a certain impact on the safety of square shell batteries. Therefore, it is necessary to detect the appearance defects of the ears.
[0046] For ear defect detection, it is first necessary to ensure that a clear image of the ear edge is obtained. After winding, the edges of different ears of the bare battery cell are often not on the same focal plane, which brings difficulties to judging whether there are defects in the ears. Currently, a widely used method is to collect images by motor module motion zooming. The camera is driven by a motor to move, and multiple images are collected at different object distances, and then the images are fused to obtain an image that can clearly image even if the ears are misaligned. Then, the algorithm analyzes and processes the image for defects and outputs the detection results to the device for classification. This method is applicable to the detection of most products.
[0047] Exemplarily, the device for collecting images by motor module motion zooming may include: a linear motion module, a high-brightness stroboscopic light source, a prism, a prism moving cylinder, an oil buffer, a 12-megapixel charge-coupled device (CCD), a camera pad, a motor, a lens fixing ring, and a module backing plate.
[0048] Under the demand for high-speed production of square shell batteries, the most widely used solution in the current market is module moving zooming. The state of the electrode sheet at different object distances is dynamically photographed by moving the module, and then a clear ear image is generated through algorithm fusion. The battery cell can be as Figure 1 shown. As Figure 2 shown, each battery cell 210 requires multiple moving modules 220 to photograph different positions of the ears.
[0049] In the actual process of collecting images by motor module motion zooming, the phenomenon that the fused image is not clear often occurs, and the algorithm will determine it as defective, resulting in an increase in the overkill rate of production and a reduction in production efficiency.
[0050] There are two reasons for the above problems: First, the movement of the motor causes jitter, resulting in image offset during image fusion; second, in mechanical installation, it is very difficult to ensure that the central axis of the camera lens is exactly the same as the movement direction. If there is an angle, position offset will also occur at different photographing positions of the moving module. Image fusion requires that the deviation does not exceed the image resolution of the edge of a tab.
[0051] As Figure 3 shown, during the actual process of photographing tab images, the angle α between the prism 310 and the battery cell should be greater than 45°. There will be an angle between the optical axis e of the camera lens and the movement axis f. During the process of the camera moving along the movement axis f, the tabs in the camera's field of view will shift, which may cause problems such as double images during final image fusion.
[0052] As Figure 4 shown, the third image 410 is the image collected by the camera before a certain movement, and the fourth image 420 is the image collected after the camera moves. "A" represents the central feature pixel point of the image. Due to the angle between the optical axis of the camera lens and the movement axis, the position of A shifts before and after the camera moves.
[0053] Pixel point offset will cause the fused image to be unclear. The fused image can be as Figure 5 shown, where one tab forms two or more double images in the fused image.
[0054] In summary, the method of collecting images through the movement and zoom of the motor module for tab defect detection has the following technical problems:
[0055] 1. During the movement of the motor module, there will be an angle between the optical axis of the camera lens and the movement axis, resulting in frequent pixel point offset, causing the fused image to be unclear. Therefore, high requirements are placed on the consistency of mechanical installation and debugging.
[0056] 2. It is inevitable that there will be mechanical vibration problems during the movement of the motor, such as screw lubrication, mechanical wear, servo parameters, assembly level, etc., which will cause image jitter and also result in the fused image being unclear.
[0057] 3. The tab detection station generally has a small space, there are many motors and sensors in the module, and it is very difficult to separate the strong and weak electricity of the cable routing, making maintenance very inconvenient.
[0058] In view of the above technical problems, the present application provides an ear tab detection system and method. When the cell assembly reaches the ear tab detection station, the host computer can output a plurality of voltage signals to the liquid lens and send an image acquisition signal to the camera. The liquid lens can adjust its own focal length based on each voltage signal. After each adjustment of the focal length by the liquid lens, the camera can collect a first image of the ear tab of the cell assembly through the liquid lens, obtain a plurality of first images, and send the plurality of first images to the host computer. Then, the host computer can fuse the plurality of first images into a second image and perform an appearance defect detection on the ear tab based on the second image to obtain a detection result. In this way, the detection of the appearance defects of the ear tab can be realized.
[0059] In the embodiments of the present application, a liquid lens is adopted. The liquid lens can adjust its own focal length based on the voltage signal. After each adjustment of the focal length by the liquid lens, the camera can collect an image of the ear tab through the liquid lens, without using a motor and without moving the camera. Therefore, there will be no pixel offset, nor will the image be jittered due to mechanical vibration during the movement of the motor. Moreover, there are not many motors, sensors and cables, which is convenient for maintenance.
[0060] The ear tab detection system and method provided by the embodiments of the present application will be introduced in detail below.
[0061] Figure 6 It is a top view of the ear tab detection system provided by some embodiments of the present application.
[0062] As Figure 6 shown, the ear tab detection system may include: a host computer 610 and a camera 620.
[0063] Among them, the host computer 610 may be electrically connected to the camera 620 provided with a liquid lens 621. When the cell assembly reaches the ear tab detection station, the host computer 610 can output a plurality of voltage signals to the liquid lens 621 and send an image acquisition signal to the camera 620;
[0064] The liquid lens 621 can be used to adjust its own focal length based on each voltage signal;
[0065] The camera 620 can be used to collect a first image of the ear tab of the cell assembly through the liquid lens 621 after each adjustment of the focal length by the liquid lens 621 based on the image acquisition signal, obtain a plurality of first images, and send the plurality of first images to the host computer 610;
[0066] The host computer 610 can also be used to fuse the plurality of first images into a second image and perform an appearance defect detection on the ear tab based on the second image to obtain a detection result.
[0067] Here, the tab can include an aluminum inner tab, an aluminum outer tab, a copper inner tab, and a copper outer tab. The camera 620 can be a camera.
[0068] The host computer 610 can include a liquid pressure variable focusing module, an image acquisition control module, an image fusion module, an algorithm processing module, and a result output module. Among them, the liquid pressure variable focusing module can be used to output multiple voltage signals to the liquid lens 621; the image acquisition control module can be used to send an image acquisition signal to the camera 620; the image fusion module can be used to fuse multiple first images into a second image; the algorithm processing module can be used to perform appearance defect detection on the tab based on the second image to obtain a detection result; the result output module can be used to output the detection result.
[0069] Specifically, when the battery cell assembly reaches the tab detection station, the host computer 610 can receive a product in-place signal, and then the host computer 610 can output multiple voltage signals to the liquid lens 621 and send an image acquisition signal to the camera 620. The liquid lens 621 can adjust its own focal length based on each voltage signal. The camera 620 can, based on the image acquisition signal, after each adjustment of the focal length of the liquid lens 621, collect a first image of the tab of the battery cell assembly through the liquid lens 621 to obtain multiple first images, and send the multiple first images to the host computer 610. Then the host computer 610 can fuse the multiple first images into a second image and perform appearance defect detection on the tab based on the second image to obtain a detection result.
[0070] The zoom principle of the liquid lens is to change the curvature of the liquid inside the liquid lens based on a voltage signal, thereby achieving zoom. The curvature of the liquid inside the liquid lens is negatively correlated with the focal length of the liquid lens. As Figure 7 shown, the greater the curvature of the liquid inside the liquid lens, the shorter the focal length of the liquid lens, curvature 1 < curvature 2 < curvature 3, f1 > f2 > f3.
[0071] The liquid lens zooms along the optical axis direction of the liquid lens, so there will be no problem of pixel point offset. The liquid lens adjusts its own focal length based on a voltage signal, effectively avoiding the generation of mechanical vibration. The solution using a liquid lens does not require structural components related to motors and modules, so the installation is relatively simple, on-site maintenance and adjustment are more convenient, and multiple servo motors and sensors are saved, facilitating cable routing in a narrow space.
[0072] Thus, when the upper computer determines that the battery cell assembly has reached the tab detection station, it can output multiple voltage signals to the liquid lens and send an image acquisition signal to the camera. The liquid lens can adjust its focal length based on each voltage signal, and the camera can, based on the image acquisition signal, after the liquid lens adjusts its focal length each time, capture a first image of the tab of the battery cell assembly through the liquid lens, obtaining multiple first images, and send the multiple first images to the upper computer. Then, the upper computer can fuse the multiple first images into a second image and perform an appearance defect detection on the tab based on the second image to obtain a detection result. In this way, the detection of tab appearance defects can be realized.
[0073] In some embodiments of the present application, there may be a linear relationship between the focal length of the liquid lens and the voltage signal. The liquid lens can be used to determine the focal length based on each voltage signal and the linear relationship, obtaining multiple target focal lengths, and adjust its own focal length based on each target focal length.
[0074] In this way, by using a liquid lens with a linear relationship between the focal length and the voltage signal, the zoom of the liquid lens can be controlled more conveniently and accurately.
[0075] Currently, there is no liquid lens suitable for high-speed wire drawing. In order to customize a liquid lens suitable for high-speed wire drawing of square shell batteries, various parameters can be determined according to requirements, and a liquid lens can be selected or customized according to the parameters.
[0076] Specifically, the parameters of the liquid lens may include: zoom range, depth of field, and optical magnification.
[0077] Among them, the zoom range can be determined based on the maximum misalignment amount of the tab. The misalignment of the tab will cause the width of the tab to increase. The larger the misalignment amount of the tab, the larger the width of the tab. If the zoom range is not large enough, it may not be possible to capture a complete image of the tab with a larger width. Therefore, it is necessary to ensure that the zoom range of the liquid lens can meet the requirement of capturing a complete image of the tab even when the misalignment amount of the tab is the largest. Therefore, the zoom range can be greater than the maximum misalignment amount of the tab, and the maximum misalignment amount of the tab can be set according to the actual situation. For example, if the maximum misalignment amount of the tab is usually 40 mm, then the zoom range of the liquid lens can be greater than 40 mm.
[0078] Depth of field is an important parameter that determines whether a liquid lens is suitable for high-speed wire drawing production. In the object space, centered on the working distance when the lens is optimally focused, there is a range before and after within which the lens can form a clear image, and this range is the depth of field. The depth of field can be the quotient of the zoom range and the number of image acquisitions. The larger the depth of field, the fewer the number of image acquisitions. For example, if the production speed requirement of the production line is 24 PPM and the cycle is approximately 2.5 s, among which, the time required for the battery cell assembly to move to the detection station is 1 s, the time required for the prism to move to the tab area is 0.35 s, the time required for the camera to acquire an image is 0.8 s, and the time required for the prism to retract is 0.35 s. If the camera used is a U-port black-and-white camera with a resolution of 1200w and a frame rate of about 28 frames, since the time for image acquisition is 0.8 s, considering the stability of acquisition, the number of effectively acquirable images is about 20 times. If the zoom range is 40 mm, then the depth of field is 2 mm. Since the zoom range needs to be greater than 40 mm, the depth of field needs to be greater than 2 mm. Considering the stability of voltage zoom of the liquid lens, a liquid lens with a depth of field of 3 mm can be selected.
[0079] The optical magnification can be calculated by the following formula:
[0080] Depth of field = 2 x Permissible COC x Effective F value / Square of optical magnification
[0081] Among them, Permissible COC is the diameter of the permissible circle of confusion, usually 0.04 mm.
[0082] By calculating with the above formula and considering the detection range of the tab and the camera resolution, it can be determined that the optical magnification is between 0.3 and 0.35.
[0083] In summary, a liquid lens with an optical magnification between 0.3 and 0.35, a depth of field of 3 mm, and a zoom range greater than 40 mm can be selected.
[0084] In some embodiments of the present application, the tab detection system may further include: a prism.
[0085] The prism can be electrically connected to the host computer and can be used to image the tab;
[0086] The host computer can also be used to control the prism to move to the tab area of the battery cell assembly when the battery cell assembly reaches the detection station;
[0087] The camera can be used to acquire images of the tab in the prism through the liquid lens after each focal length adjustment of the liquid lens, and obtain multiple first images.
[0088] Specifically, the prism may include a driving member and a reflective area. The driving member is mechanically connected to the reflective area, and the driving member is electrically connected to the upper computer. When the battery cell assembly reaches the detection station, the upper computer can control the driving member of the prism to move the reflective area to the tab area of the battery cell assembly. The reflective area can image the tab, and then the camera can collect the image of the tab in the reflective area through the liquid lens each time the liquid lens adjusts its focal length, obtaining multiple first images.
[0089] Exemplarily, as Figure 8 shown, when the battery cell assembly reaches the detection station, the upper computer can control the prism 630 to move to the tab area of the battery cell assembly. The prism 630 can then image the tab. The liquid lens 621 can zoom in the direction of arrow h, and the camera 620 can collect the image of the tab in the prism 630 through the liquid lens 621 each time the liquid lens 621 adjusts its focal length, obtaining multiple first images.
[0090] In this way, the tab image can be obtained by collecting the image of the tab in the prism, without directly photographing the tab, which can save space and solve the problem that the camera cannot enter a narrow space to collect images.
[0091] In some embodiments of the present application, the prism may include a reflective area, which can be used to reflect the first light reflected by the tab to the camera.
[0092] In this way, the prism can image the tab, and the camera can collect the image of the tab in the prism to obtain the tab image.
[0093] In some embodiments of the present application, the tab detection system may further include: a light source module.
[0094] Wherein, the light source module is electrically connected to the upper computer;
[0095] The upper computer is further configured to control the light source module to light up when the battery cell assembly reaches the detection station;
[0096] The camera is configured to collect the image of the tab in the prism through the liquid lens when the tab is illuminated by the light source module.
[0097] Here, the upper computer may further include a light source control module, which can be used to control the light source module to light up.
[0098] Specifically, the upper computer can control the light source module to light up when the battery cell assembly reaches the detection station. After the light source module lights up, it can illuminate the tab, and the camera can collect the image of the tab in the prism through the liquid lens when the tab is illuminated by the light source module.
[0099] In this way, by illuminating the tab with the light source module, a clearer tab image can be collected.
[0100] In some embodiments of the present application, the second light ray emitted by the light source module can be projected onto the tab;
[0101] The camera can be used to collect the position where the tab is irradiated by the second light ray to obtain a first image.
[0102] In this way, the second light ray emitted by the light source module is projected onto the tab, the tab can be illuminated by the second light ray, and the camera can collect the position where the tab is irradiated by the second light ray to obtain a clear image of the tab.
[0103] The embodiments of the present application also provide a tab detection method. The execution subject of this tab detection method can be a tab detection system. The tab detection method provided by the embodiments of the present application will be introduced below.
[0104] Figure 9 It is a schematic flowchart of the tab detection method provided for some embodiments of the present application.
[0105] As Figure 9 shown, the tab detection method may include the following steps:
[0106] S910, when the battery cell assembly reaches the detection station, output a plurality of voltage signals to the liquid lens through the host computer, so that the liquid lens adjusts its own focal length based on each voltage signal;
[0107] S920, send an image acquisition signal to the camera through the host computer, so that the camera, based on the image acquisition signal, after each adjustment of the focal length of the liquid lens, acquires a first image of the tab of the battery cell assembly through the liquid lens to obtain a plurality of first images;
[0108] S930, fuse the plurality of first images into a second image through the host computer, and perform appearance defect detection on the tab based on the second image to obtain a detection result.
[0109] For the specific processes of S910 - S930, reference can be made to the above - mentioned embodiments, and details will not be repeated here.
[0110] Thus, when the battery cell assembly reaches the tab detection station, the host computer can output a plurality of voltage signals to the liquid lens and send an image acquisition signal to the camera. The liquid lens can adjust its own focal length based on each voltage signal. The camera can, based on the image acquisition signal, after each adjustment of the focal length of the liquid lens, acquire a first image of the tab of the battery cell assembly through the liquid lens to obtain a plurality of first images, and send the plurality of first images to the host computer. Then the host computer can fuse the plurality of first images into a second image and perform appearance defect detection on the tab based on the second image to obtain a detection result. In this way, the detection of tab appearance defects can be realized.
[0111] In some embodiments of the present application, before S920, the method may further include:
[0112] When the battery cell assembly reaches the detection station, the host computer controls the prism to move to the tab area of the battery cell assembly;
[0113] The prism is used to image the tab;
[0114] After each time the liquid lens adjusts its focal length, the camera uses the liquid lens to collect the image of the tab in the prism, obtaining multiple first images.
[0115] For the specific process, reference may be made to the above embodiments, which will not be elaborated herein.
[0116] In this way, the tab image can be obtained by collecting the image of the tab in the prism, without directly photographing the tab, which can save space and solve the problem that the camera cannot enter a narrow space to collect images.
[0117] In some embodiments of the present application, before S920, the method may further include:
[0118] When the battery cell assembly reaches the detection station, the host computer controls the light source module to light up;
[0119] The light source module is used to illuminate the tab;
[0120] When the tab is illuminated by the light source module, the camera uses the liquid lens to collect the image of the tab in the prism.
[0121] For the specific process, reference may be made to the above embodiments, which will not be elaborated herein.
[0122] In this way, by illuminating the tab with the light source module, a clearer tab image can be collected.
[0123] In some embodiments of the present application, the above process of the host computer fusing multiple first images into a second image may include:
[0124] The host computer divides multiple first images into regions according to a preset method, obtaining multiple regions corresponding to each first image;
[0125] For each region among the multiple regions, the host computer respectively performs: determining the clarity of the region in each first image; determining the target region corresponding to the highest clarity from the regions corresponding to multiple first images;
[0126] The host computer fuses the target regions corresponding to each region among the multiple regions into a second image.
[0127] Here, the clarity of the same region in multiple first images can be different. For each region, the image with the highest clarity among the multiple images can be selected as the target region. After determining the target region for each region, multiple target regions can be fused into a second image.
[0128] In this way, multiple images with unclear regions can be fused into a clear image, and based on the clear image, the tab detection can be performed more accurately.
[0129] To better describe the entire solution, based on the above embodiments, a specific example is given, as Figure 10 shown. The tab detection method may include S1001 - S1010, which will be explained in detail below.
[0130] S1001, when the upper computer determines that the battery cell assembly has reached the detection station, it controls the prism to extend into the tab area.
[0131] S1002, the upper computer controls the light source module to light up.
[0132] S1003, the upper computer controls the liquid lens to zoom in and out multiple times and controls the camera to collect multiple first images.
[0133] S1004, the upper computer fuses the multiple first images into a second image.
[0134] S1005, the upper computer performs appearance defect detection on the tabs based on the second image to obtain a detection result.
[0135] S1006, the upper computer outputs the detection result.
[0136] S1007, the upper computer controls the liquid lens to reset.
[0137] S1008, the upper computer controls the light source module to turn off.
[0138] S1009, the upper computer controls the prism to retract.
[0139] S1010, the battery cell assembly leaves the detection station.
[0140] The specific processes of S1001 - S1010 can be referred to the above embodiments and will not be elaborated here.
[0141] Thus, when the upper computer determines that the battery cell assembly has reached the tab detection station, it can output multiple voltage signals to the liquid lens and send an image acquisition signal to the camera. The liquid lens can adjust its focal length based on each voltage signal. After each adjustment of the focal length by the liquid lens, the camera can acquire a first image of the tabs of the battery cell assembly through the liquid lens, obtaining multiple first images, and then send the multiple first images to the upper computer. Subsequently, the upper computer can fuse the multiple first images into a second image and perform appearance defect detection on the tabs based on the second image to obtain a detection result. In this way, the detection of tab appearance defects can be achieved.
[0142] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and components therein can be replaced with equivalents. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. An ear tab detection system, characterized in that, Including: A host computer, electrically connected to a camera equipped with a liquid lens. The host computer is configured to output a plurality of voltage signals to the liquid lens and send an image acquisition signal to the camera when the battery cell assembly reaches the ear detection station; The liquid lens is used to adjust its own focal length based on each of the voltage signals; The camera is used to collect a first image of the ears of the battery cell assembly through the liquid lens after each focal length adjustment of the liquid lens based on the image acquisition signal, obtaining a plurality of first images, and sending the plurality of first images to the host computer; The host computer is further used to fuse the plurality of first images into a second image, and perform appearance defect detection on the ears based on the second image to obtain a detection result.
2. The system according to claim 1, wherein The focal length of the liquid lens has a linear relationship with the voltage signal. The liquid lens is used to determine the focal length based on each of the voltage signals and the linear relationship to obtain a plurality of target focal lengths, and adjust its own focal length based on each of the target focal lengths.
3. The system according to claim 1 or 2, characterized in that, The system further includes: A prism, electrically connected to the host computer, for imaging the ears; The host computer is further used to control the prism to move to the ear area of the battery cell assembly when the battery cell assembly reaches the detection station; The camera is used to collect the image of the ears in the prism through the liquid lens after each focal length adjustment of the liquid lens to obtain the plurality of first images.
4. The system according to claim 3, wherein The system further includes: A light source module, electrically connected to the host computer; The host computer is further used to control the light source module to light up when the battery cell assembly reaches the detection station; The camera is used to collect the image of the ears in the prism through the liquid lens when the ears are illuminated by the light source module.
5. The system according to claim 3, wherein The prism includes a reflective area for reflecting the first light reflected by the ears to the camera.
6. The system according to claim 4, wherein The second light emitted by the light source module is projected onto the ears; The camera is used to collect the position of the ears irradiated by the second light to obtain the first image.
7. A tab detection method, characterized in that, Including: When the battery cell assembly reaches the detection station, the host computer outputs a plurality of voltage signals to the liquid lens, so that the liquid lens adjusts its own focal length based on each of the voltage signals; The host computer sends an image acquisition signal to the camera, so that the camera collects a first image of the ears of the battery cell assembly through the liquid lens after each focal length adjustment of the liquid lens based on the image acquisition signal, obtaining a plurality of first images; The host computer fuses the plurality of first images into a second image, and performs appearance defect detection on the ears based on the second image to obtain a detection result.
8. The method according to claim 7, wherein Before the host computer sends the image acquisition signal to the camera, the method further includes: The host computer controls the prism to move to the ear area of the battery cell assembly when the battery cell assembly reaches the detection station; Using the prism to image the ears; After each focal length adjustment of the liquid lens using the camera, the imaging of the tab in the prism is collected through the liquid lens to obtain the multiple first images.
9. The method according to claim 8, wherein Before sending an image acquisition signal to the camera through the host computer, the method further includes: When the battery cell assembly reaches the detection station, the host computer controls the light source module to light up; The light source module is used to illuminate the tab; When the tab is illuminated by the light source module, the camera collects the imaging of the tab in the prism through the liquid lens.
10. The method according to any one of claims 7-9, characterized in that, The host computer fusing the multiple first images into a second image includes: The host computer divides the multiple first images into regions according to a preset method to obtain multiple regions corresponding to each first image; For each of the multiple regions, the host computer respectively performs: determining the clarity of the region in each of the first images; determining the target region corresponding to the highest clarity from the regions corresponding to the multiple first images; The host computer fuses the target regions corresponding to each of the multiple regions into the second image.