Tab detection mechanism and cylindrical battery cell winding detection system

Abstract

The application discloses a tab detection mechanism and a cylindrical battery cell winding detection system. The tab detection mechanism comprises a visual detection assembly and a light source assembly. The detection path of the visual detection assembly and the irradiation path of the light source assembly are both inclined to the axis of the winding needle and pass through the stacking area of the tab. The obtuse angle between the irradiation path of the light source assembly and the axis of the winding needle is larger than the obtuse angle between the detection path of the visual detection assembly and the axis of the winding needle. The tab is detected by the visual detection assembly, and the light source assembly is arranged at the same time. The visual detection assembly and the light source assembly are both inclined to the tab, and the irradiation angle of the light source is larger than the detection path angle. When the tab is normally stacked, no high light reflection area appears in the visual field of the visual detection assembly, and the imaged tab is black. When the tab is folded during the stacking process, the light source is reflected and acquired by the visual detection assembly, and a high-light image appears in the imaged part of the tab area, so that the abnormal stacking can be accurately detected.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a tab detection mechanism and a cylindrical cell winding detection system. Background Technology

[0002] During the production of cylindrical battery cells, as the electrode sheets are wound by a winding needle, the tabs are stacked sequentially along the radial direction of the cell to form a fan-shaped structure. Due to the tight stacking between adjacent tab layers, some tab layers are at risk of warping and wrinkling, which affects the product quality of the cylindrical battery cell. Currently, visual inspection devices can be used to vertically inspect the tabs during the stacking process. However, due to the uneven brightness of the tab surface, the visual inspection device cannot accurately distinguish the difference between the state of the tab after it has been folded and the state of the normal tab after it has been folded. Therefore, it is impossible to accurately detect the folding problem of the tab, which in turn affects the stability and yield of the battery cell product. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a tab detection mechanism and a cylindrical cell winding detection system to accurately detect the tab state during the stacking process and optimize the product quality of cylindrical cells.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A tab detection mechanism for detecting tabs stacked on a needle winding device, comprising:

[0006] The visual inspection component and the light source component, the detection path of the visual inspection component and the illumination path of the light source component are both set at an angle to the axis of the winding needle, and both pass through the stacking area of ​​the tabs.

[0007] The obtuse angle between the illumination path of the light source component and the axis of the needle winding is greater than the obtuse angle between the detection path of the vision inspection component and the axis of the needle winding.

[0008] As can be seen from the above technical solution, one aspect of this disclosure provides an electrode detection mechanism, which mainly includes a vision detection component and a light source component to detect the stacking shape of electrodes stacked on a winding needle. Specifically, the detection path of the vision detection component is inclined to the axis of the winding needle and passes through the stacking area of ​​the electrodes to detect the electrodes during the winding and stacking process; while the illumination path of the light source component is also inclined to the axis of the winding needle and passes through the stacking area of ​​the electrodes to illuminate the stacking area of ​​the electrodes. Specifically, the obtuse angle formed by the illumination path of the light source component and the axis of the winding needle is greater than the obtuse angle formed by the detection path of the vision inspection component and the axis of the winding needle. Based on this, the illumination path of the light source component can illuminate the stacked area of ​​the tabs and one end of the stacked tabs on the winding needle. In the imaging area of ​​the vision inspection component, the end of the winding needle with stacked tabs exhibits a relatively bright image due to illumination. However, because the illumination angle of the light source component is greater than the imaging angle of the vision inspection component, the tabs that are normally stacked and protruded at one end of the winding needle will reflect the illumination from the light source component, thus avoiding the illumination of the vision inspection component. The imaging range of the visual detection component causes the tabs stacked in a normal shape to appear black in the image detected by the visual detection component. Based on the relatively bright background, there are distinct black and white areas in the image of the visual detection component, and the black areas represent the normal stacking shape of the tabs. Correspondingly, when the tabs fold or collapse, their shape will change. The light from the light source component will be reflected by the folded tabs and captured by the visual detection component, so that some areas of the tabs in the image have a brightness state similar to or the same as the background, which is different from the preset black tab shape and can be clearly distinguished. It should be noted that, unlike existing technologies, this disclosure does not consider directly improving the image clarity of the tabs at the stacking position. Instead, it uses the end of the winding needle for tab stacking as the imaging background and presents it in a relatively bright state. By adjusting the illumination angle, the tabs are transformed into black imaging areas. By observing the imaging shape of the black areas, the stacking state of the tabs can be detected. At the same time, the clear black and white of the tabs and background allows the image acquired by the visual detection component to be clearly recognized by the algorithm, thereby improving the accuracy of the tab detection mechanism in detecting the shape of the tab stacking process. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the electrode detection mechanism provided in an embodiment of the present invention;

[0011] Figure 2 This is a schematic diagram of the structure of the coiled needle and the electrode tab;

[0012] Figure 3 A schematic diagram showing the angle between the visual inspection component and the light source component and the axis of the winding needle according to an embodiment of the present invention;

[0013] Figure 4 for Figure 3 A front view;

[0014] Figure 5 A schematic diagram showing the vertical distance between the line scan camera and the electrode tab, provided in an embodiment of this utility model;

[0015] Figure 6 This is a schematic diagram showing the distance between the detection end of the vision inspection component and the electrode being inspected.

[0016] Figure 7 This is the back view of the visual inspection component;

[0017] Figure 8 A schematic diagram of a cylindrical battery cell winding detection system provided in an embodiment of this utility model.

[0018] Figure 9 This is a schematic diagram of the tab folding state provided in an embodiment of the present invention;

[0019] Figure 10 This is a schematic diagram of the tab folding state provided for another embodiment of the present invention.

[0020] in:

[0021] 10-Vision inspection component; 110-Line scan camera; 120-Slide table; 130-Support base; 140-Detection unit; 150-Servo motor; 160-Carrier plate; 170-First rotating column; 180-Second rotating column; 190-Support clamp;

[0022] 20 - Light source assembly; 210 - Line scan light source;

[0023] 30-Curled needle; 310-Edge loop;

[0024] 40 - Electrode testing institution; 50 - Front-end testing institution. Detailed Implementation

[0025] The core of this application is to disclose a tab detection mechanism and a cylindrical cell winding detection system to accurately detect the state of the tabs 310 during the stacking process and optimize the product quality of cylindrical cells.

[0026] To enable those skilled in the art to better understand the present application, embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model described in the claims. Additionally, the complete content of the structures represented in the following embodiments is not limited to those necessary for the solution of the utility model described in the claims.

[0027] like Figure 1 As shown, one aspect of this disclosure provides a tab detection mechanism to detect the stacking morphology of tabs 310 on the electrode sheet during the winding process in the cell production process.

[0028] It should be noted that a battery cell is formed by winding or stacking a positive electrode sheet, a negative electrode sheet, and a separator between them. The positive electrode sheet includes a positive current collector and a positive active material. The positive current collector can be made of metals such as aluminum foil, nickel foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The positive active material includes the main positive active material, conductive agent, binder, etc. The main positive active material includes one or more lithium-containing positive active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate.

[0029] Similarly, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material. The negative electrode current collector can be made of metal materials such as copper foil, aluminum foil, and stainless steel, or it can be a composite foil material formed by combining metals and insulating materials. The negative electrode active material includes the negative electrode active material, conductive agent, binder, etc. The negative electrode active material includes one or more of the following: artificial graphite, natural graphite, silicon carbide, silicon oxide, lithium titanate, etc.

[0030] The separator is an insulating membrane placed between the positive and negative electrode plates to prevent electrons from passing through while allowing ions to pass through. The separator is made of at least one of the following materials: glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, etc.

[0031] The tabs are metal conductors that lead the positive and negative electrodes out of the battery cell. They are the contact points during charging and discharging. Before being wound, the tabs are protruding structures on one side of the electrode width direction. Multiple sets of tabs are set at intervals along the length direction of the electrode as needed and are wound together with the electrode.

[0032] In some embodiments of this disclosure, such as Figure 1 and Figure 2As shown, the electrode detection mechanism mainly includes a vision detection component 10 and a light source component 20. The vision detection component 10 is used to acquire and generate image information to determine the structural shape of the electrode 310; while the light source component 20 is used to provide local lighting to enhance the brightness of the illuminated area. Specifically, the detection path of the vision detection component 10, i.e. the imaging process path, is inclined to the axis of the winding needle 30 and passes through the stacked area of ​​the electrode 310, so as to detect the electrode 310 and generate an image during the winding and stacking process of the electrode 310. The inclined detection path enables the vision detection component 10 to use the stacked electrode 310 as the target image and the back end face of the winding needle 30 as the background to form a complete image during the imaging process.

[0033] It should be noted that the detection path of the visual detection component 10 is the effective image detection range of the visual detection component 10, such as... Figure 3 and Figure 4 As shown, the range of the dashed line extending from the lens of the visual detection component 10 is the effective image detection range, while its detection path is shown by the dashed line at the center position.

[0034] Similarly, the illumination path of the light source component 20 is the path of the light emitted from the light source component 20, such as... Figure 3 and Figure 4 As shown, the illumination path of the light source assembly 20 is represented by a dashed line extending from the position of the light source assembly 20.

[0035] Based on this, the illumination path of the light source assembly 20 is also inclined to the axis of the winding needle 30 and passes through the stacked area of ​​the tabs 310 to illuminate the stacked area of ​​the tabs 310 and one end of the winding needle 30.

[0036] Specifically, the obtuse angle formed by the illumination path of the light source assembly 20 and the axis of the winding needle 30 is greater than the obtuse angle formed by the detection path of the vision detection assembly 10 and the axis of the winding needle 30. This angular relationship allows the illumination path of the light source assembly 20 to illuminate the stacked area of ​​the tabs 310 and one end of the stacked tabs 310 on the winding needle 30 without interfering with the detection path of the vision detection assembly 10. Meanwhile, in the imaging area of ​​the vision inspection component 10, one end of the stacked tabs 310 on the winding needle 30 presents a relatively bright image due to illumination. Since the illumination angle of the light source component 20 is greater than the imaging angle of the vision inspection component 10, the tabs 310 stacked in a normal shape at one end of the winding needle 30 will reflect the light from the light source component 20 and avoid the imaging range of the vision inspection component 10. As a result, the tabs 310 stacked in a normal shape appear black in the image detected by the vision inspection component 10, while in the imaging with one end of the winding needle 30 as the background, the background will appear relatively bright due to the illumination of the light source component 20.

[0037] Based on the above structure, the image captured by the visual detection component 10 will contain distinct black and white areas. The relatively bright white areas represent the background under the influence of illumination, while the black areas represent the stacked tabs 310. Due to the contrast between light and dark, the image captured by the visual detection component 10 enables the algorithm to clearly distinguish the black and white areas in the image. When the black areas in the image captured by the visual detection component 10 have a regular structure, usually rectangular protrusions, it indicates that the tabs 310 are in a normal stacked state. However, when the tabs 310 fold or collapse, the light from the source component is reflected by the folded tabs 310 and captured by the visual detection component 10. The shape of the black areas in the image will change, and the original black areas will have a brightness state similar to or the same as the background, which is different from the preset black tab 310 shape and can be clearly distinguished.

[0038] It should be noted that, unlike the prior art, the electrode detection mechanism provided in this embodiment does not conduct further research on the imaging clarity of the electrode 310. Instead, it uses the end of the winding needle 30 for stacking the electrode 310 as the imaging background and uses the light source component 20 to make it appear relatively bright in the image. By adjusting the illumination angle, the electrode 310 is transformed into a black imaging area. By observing the imaging shape of the black area, the stacking state of the electrode 310 is indirectly detected. In the process of the algorithm recognizing the image, the clear black and white of the electrode 310 and the background allows the image acquired by the visual detection component 10 to be clearly recognized by the algorithm, thereby accurately judging the stacking shape of the electrode 310 and improving the accuracy of the electrode detection mechanism in detecting the shape of the electrode 310 stacking process.

[0039] Furthermore, in some embodiments of this disclosure, such as Figure 3 and Figure 4As shown, the obtuse angle α between the illumination path of the light source component 20 and the axis of the winding needle 30, and the obtuse angle β between the detection path of the vision detection component 10 and the axis of the winding needle 30, have a range of 30-60 degrees, specifically 30, 40, 50, or 60 degrees. It should be noted that α and β represent the tilt state of the light source component 20 and the vision detection component 10 relative to the axis of the winding needle 30, respectively. The value of α is greater than β to satisfy the purpose of making the tab 310 appear black in the image of the vision detection component 10 through the illumination effect of the light source component 20. However, in this embodiment, if the value of α-β is less than 30 degrees, the two angles are close, meaning the tilt states of the light source component 20 and the vision detection component 10 relative to the axis of the winding needle 30 are similar. In this case, there is a risk that the illumination path of the light source component 20 and the detection path of the vision detection component may overlap. This overlap would result in similar relative relationships between the illumination path, the detection path, and the tab 310. This results in the tab 310 having high brightness after imaging, making it difficult to distinguish from the background. If the value of α-β is greater than 60 degrees, the tilt difference between the light source component 20 and the vision detection component 10 based on the axis of the winding needle 30 is large. Although the tab 310 and the background can be kept in a clear black-and-white distinction after imaging, when a small fold occurs on the tab 310, the light from the light source component 20 will be reflected into the acquisition range of the vision detection component 10. This will cause the area of ​​the tab 310 to appear obviously bright in the image of the vision detection component 10, which will be judged by the algorithm as a serious deformation of the tab 310. This is different from the actual state of the tab 310 and has a large risk of false alarm. Therefore, the range of α-β is limited to 30 degrees to 60 degrees so that the light source component 20 can make the image of the visual detection component 10 present a black and white area. At the same time, according to the difference in the flipping state of the tab 310, the area of ​​the tab 310 in the image presents a relatively bright area of ​​different degrees, thus ensuring that the detection gradient of the tab detection mechanism matches the actual state of the tab 310.

[0040] Furthermore, based on the above embodiments, such as Figure 4As shown, the obtuse angle α between the illumination path of the light source assembly 20 and the axis of the winding needle 30 ranges from 120 degrees to 175 degrees, specifically 120 degrees, 135 degrees, 150 degrees, 165 degrees, or 175 degrees, to meet its illumination requirements for the stacked area of ​​the tabs 310 and one end of the winding needle 30. Specifically, if the angle between the illumination path of the light source assembly 20 and the axis of the winding needle 30 is too large, it will tend to be parallel to the tabs 310, causing the tabs 310 to fail to reflect light and be captured by the vision detection component 10 when they fold. This results in the tabs 310 with folding defects failing to produce abnormally bright areas on the image of the vision detection component 10, leading to inaccurate detection of the tabs 310's state. Conversely, if the angle between the illumination path of the light source assembly 20 and the axis of the winding needle 30 is too small, the tabs 310, which are normally convex and stacked, will still be able to reflect some light for the vision detection component 10 to capture. This would result in the tab 310 having a certain brightness in the imaging of the visual inspection component 10, making it impossible to clearly distinguish from the relatively bright areas of the background. This would make it difficult for the algorithm to accurately distinguish the black and white partitions in the image, thus causing detection errors. Therefore, the range of the obtuse angle α between the illumination path of the light source component 20 and the axis of the winding needle 30 is limited to 120 degrees-175 degrees to meet the black state requirement of the tab 310 in the imaging of the visual inspection component 10, and to enable precise image state changes of the folded tab 310, thereby improving the detection accuracy of the tab detection mechanism.

[0041] In other embodiments of this disclosure, such as Figure 4As shown, the obtuse angle β between the detection path of the vision inspection component 10 and the axis of the winding needle 30 ranges from 100 degrees to 145 degrees, specifically 100 degrees, 110 degrees, 120 degrees, 130 degrees, 140 degrees, or 145 degrees, to achieve effective detection of the stacked area of ​​the tabs 310 by the vision inspection component 10. It should also be noted that if the obtuse angle β between the detection path of the vision inspection component 10 and the axis of the winding needle 30 is less than 100 degrees, the tilt angle of the detection path relative to the axis of the winding needle 30 is too small. When the tab 310 is placed in the center of the detection path, it will result in the presence of other areas in the background besides the section of the winding needle 30, such as electrode sheets or other production equipment on the other side, causing the vision inspection component 10 to... The imaging background is cluttered, making it difficult to ensure that the entire background is in a relatively bright state, which affects the algorithm's ability to clearly identify the tab 310 and the background in the image. If the obtuse angle β between the detection path of the visual detection component 10 and the axis of the winding needle 30 is greater than 145 degrees, then its tilt angle relative to the axis of the winding needle 30 is too large. At this time, the tab 310, which is parallel to the axis of the winding needle 30, will be tilted in the imaging of the visual detection component 10 and occupy a small black area, that is, form a small black pattern area. If the tab 310 has a small folding problem, its manifestation in the image is not obvious enough. The black area in the image will only produce a small change in area and cannot be clearly captured, and there is a risk of detection error. Therefore, the obtuse angle β between the detection path and the axis of the winding needle 30 is set to a range of 100-145 degrees to meet the imaging background requirements of the visual inspection component 10. At the same time, this ensures that the tab 310 has a sufficient black coverage area after imaging, so that when the tab 310 folds and collapses, it can produce obvious changes in the black area of ​​the imaging and be clearly detected and identified.

[0042] Furthermore, it should be noted that in some preferred embodiments of this disclosure, the obtuse angle between the detection path of the visual detection component 10 and the axis of the winding needle 30 is greater than the maximum collapse angle of the tab 310. It should be explained that the collapse of the tab 310 refers to the folding of the edge or corner of the tab 310 away from the winding needle 30 after winding, i.e., as... Figure 9 M area in the middle, and Figure 10 The N-region structure in the winding cell folds outwards, and the angle between its collapsed area and the axial direction of the winding needle 30 is an obtuse angle. Figure 9 The angle γ formed by the M zone and the axis of the coil needle 30, or Figure 10When the angle γ formed by the N region and the axis of the winding needle 30 is greater than the obtuse angle between the detection path of the vision detection component 10 and the axis of the winding needle 30, the light reflected from the collapsed and folded area on the tab 310 will exceed the detection range of the vision detection component 10 and cannot be acquired by the vision detection component 10. The collapsed area in the imaged tab 310 will still show a black image, or produce an image with insufficient brightness due to insufficient reflection. There is still a risk that it cannot be clearly identified by the algorithm. Therefore, the obtuse angle between the detection path of the vision detection component 10 and the axis of the winding needle 30 is limited to be greater than the maximum collapse angle of the tab 310, so that when the tab 310 folds, a clear brightness change appears in the image to ensure detection accuracy.

[0043] Furthermore, in some embodiments of this disclosure, the visual inspection component 10 includes a line scan camera 110 for direct imaging. It should be noted that the line scan camera 110 is an industrial camera designed for high-speed, continuous imaging. It is widely used in surface defect detection and quality control in industries such as printing, textiles, semiconductors, lithium batteries, and photovoltaics. It can flexibly select the sensor length, lens magnification, and light source type according to the requirements of the detection width, accuracy, and speed. It is suitable for the detection of the moving tab 310 in the embodiments of this application and can generate a straight imaging path as needed to cooperate with the tab 310 and the diaphragm.

[0044] The light source assembly 20 includes a line scan light source 210, which is a light source device capable of emitting a bright beam of light. It typically consists of multiple high-brightness LED chips arranged in a straight line, and the light is focused and shaped by an optical lens system. It can achieve bright-field illumination, dark-field illumination, and backlight illumination. Working perfectly with the line scan camera 110, it enables real-time, rapid detection of moving objects. The line scan camera 110 and the line scan light source 210 work together to illuminate and acquire images of specific areas, namely the stacked area of ​​the tabs 310 and one end of the winding needle 30, ensuring focused imaging and improving detection accuracy.

[0045] Based on the above embodiments, such as Figure 5As shown, the vertical distance L1mm between the lens of the line scan camera 110 and the stacked area of ​​the tabs 310 being inspected ranges from 150mm to 300mm, specifically 150mm, 180mm, 210mm, 240mm, 270mm, or 300mm. It should be noted that if L1mm is less than 150mm, the distance between the line scan camera 110 and the tabs 310 will be too close, which may cause interference and insufficient background in the imaging area. In addition, the line scan camera 110 needs to use a large tilt angle to acquire images of multiple tabs 310 during the stacking process. If L1 is too small, it will affect the freedom of structural layout. On the other hand, if L1mm is greater than 300mm, the distance between the line scan camera 110 and the tabs 310 will be too far. The vision inspection component 10 will need to occupy more setup space in the production environment. Furthermore, a greater setup distance will cause more clutter to appear in the lens of the line scan camera 110, which will affect the clear resolution of the tabs 310 in the image. Therefore, the vertical distance L1mm between the lens of the line scan camera 110 and the electrode 310 being detected is limited to 150mm-300mm to balance the spatial setup requirements of the visual inspection component 10 and the positional relationship between the electrode 310 and the background in the imaging process.

[0046] Furthermore, such as Figure 5 As shown, the vertical distance L2mm between the emitting end of the line scan light source 210 and the tab 310 ranges from 20mm to 100mm, specifically 20mm, 40mm, 60mm, 80mm, or 100mm. The line scan light source 210 is used to emit light to illuminate a specific stacked area of ​​the tabs 310. If the vertical distance L2mm between the emitting end of the line scan light source 210 and the tab 310 is less than 20mm, the stacked area of ​​the tabs 310 will be too bright. When the reflected light after the tabs 310 are folded is insufficient, the area will remain in a contrasting black state in the image due to the strong background light, and thus cannot be accurately captured by the algorithm. If L2mm is greater than 100mm, the line scan light source 210 will suffer significant loss or even scattering during propagation, failing to maintain the background brightness in the image and resulting in insufficient reflected light after the tabs 310 are folded, thus affecting the imaging effect. Therefore, the vertical distance L2mm between the emitting end of the line scan light source 210 and the tab 310 is limited to 20mm-100mm. Specifically, the emitting end of the line scan light source 210 is referred to by the central axis of the illumination emitting area of ​​the line scan light source 210, so that the tab 310 after being folded has a significant brightness change in the imaging of the visual inspection component 10, thus meeting the inspection requirements.

[0047] Furthermore, in the production process of cylindrical battery cells, the tabs 310 are stacked in layers. The tab detection mechanism provided in this embodiment detects the stacking state of the outermost tab 310. Therefore, in order to improve the detection accuracy of the tab detection mechanism for the current layer of tabs 310 during the stacking process, such as... Figure 6 As shown, in some embodiments of this disclosure, the distance L3 between the detection end of the visual detection component 10 and the detected layer, i.e., the outermost tab 310 relative to the coil needle 30, is kept fixed. The fixed distance enables the tab 310 of the detected layer to be in a similar positional state to the visual detection component 10 during each image generation process, thereby generating a more consistent image, reducing the difficulty of the algorithm in collecting image information, and improving the accuracy of the algorithm in collecting information.

[0048] Considering the imaging area size and imaging accuracy of the visual inspection component 10, such as Figure 6 As shown, in the electrode detection mechanism provided in this embodiment, the range of L3mm is 180mm-350mm, specifically 180mm, 220mm, 260mm, 300mm or 350mm, to avoid the problem that if L3mm is too small, the electrode 310 will occupy too much space in the imaging area, resulting in insufficient background brightness and contrast, and if L3mm is too large, the reflective area of ​​the electrode 310 will be too large, which will be abnormally captured by the visual detection component 10 and produce abnormally bright areas in the image.

[0049] To fix the distance L3 between the detection end of the vision inspection component 10 and the tab 310 of the layer being inspected, such as Figure 6 and Figure 7 As shown, in some embodiments of this disclosure, the visual inspection component 10 includes a slide table 120 and a support base 130 slidably disposed along the slide table 120. The sliding direction of the support base 130 is preferably parallel to the stacking direction of the tabs 310, that is, perpendicular to the axis of the winding needle 30. A detection unit 140 for image generation is disposed on the support base 130. The support base 130 is driven by a servo motor 150. The servo motor 150 has the advantages of high control precision, fast response, and stable low-speed operation. The support base 130 is driven by the servo motor 150 to drive the detection unit 140 away from the winding needle 30 in real time during the stacking process of the tabs 310. As the tabs 310 are gradually stacked to the outermost layer, the support base 130 drives the detection unit 140 to move away from the winding needle 30 in sync, thereby fixing the relative position with the outermost tab 310, thereby satisfying the fixation of L3 and improving the imaging effect of each layer of stacked tabs 310.

[0050] Furthermore, a support plate 160 is slidably disposed on the support base 130. Unlike the sliding direction of the support base 130 based on the slide table 120, the support plate 160 is parallel to the axis of the winding needle 30 along the sliding direction of the support base 130, and the detection unit 140 is disposed on the support plate 160. The sliding process of the support plate 160 based on the support base 130 can be manually adjusted by the operator or driven by a motor. With the help of the support plate 160, the detection unit 140 can achieve position adjustment along the axial direction of the needle winding 30 by sliding the support plate 160 based on the support base 130. With the help of the support base 130, the detection unit 140 can achieve position adjustment along the radial direction of the needle winding 30 by sliding the support base 130 based on the slide table 120. This gives the detection unit 140 a larger adjustment range. It can not only achieve the ideal relative position setting of the current tab 310, but also generate an image of the tab 310 located in the central area by adjusting the position of the detection unit 140 on the tabs 310 on the needle winding 30 with different axial dimensions, thus improving the versatility of the tab detection mechanism.

[0051] Furthermore, to further enhance the adjustment freedom of the detection unit 140, in some embodiments of this disclosure, the detection unit 140 is rotatably mounted on the support plate 160 via a rotating assembly to achieve angle adjustment. Specifically, the rotating assembly includes a first rotating column 170 and a second rotating column 180, wherein the first rotating column 170 and the second rotating column 180 are vertically arranged and connected by a support clamp 190, which is a clamping and locking component with an opening. While the first rotating column 170 and the second rotating column 180 are locked together via the support clamp 190, they can be unlocked to achieve position adjustment along their respective axial directions and rotation angle adjustment along the radial direction. Based on this, the first rotating column 170 is rotatably mounted on the support plate 160. By rotating based on the support plate 160, it drives the support clamp 190 and the second rotating column 180 to rotate. The detection unit 140 is fixedly mounted on the second rotating column 180. The second rotating column 180 can directly drive the detection unit 140 to rotate based on the axis of the second rotating column 180 at the position of the support clamp 190. In the above structure, the first rotating column 170 can drive the detection unit 140 to rotate in the first plane, and the second rotating column 180 can drive the detection unit 140 to rotate in the second plane. The first plane and the second plane are perpendicular to each other to ensure that the detection unit 140 can achieve omnidirectional angle adjustment to meet the detection requirements of different angles.

[0052] It should be noted that the electrode detection mechanism provided in the above embodiments is only an example of stacking state detection for a single electrode 310 on the winding needle 30, such as the positive electrode 310. For the negative electrode 310 located on the other side of the winding needle 30, another set of electrode detection mechanisms provided in this embodiment can also be set. The two sets of electrode detection mechanisms can be symmetrically set on both sides of the winding needle 30, which will not be described in detail here.

[0053] Furthermore, such as Figure 4 As shown, in some embodiments of this disclosure, along a first direction, the light source component 20 is disposed between the vision detection component 10 and the winding needle 30, such that the light source component 20 faces away from the vision detection component 10. This allows the light from the light source component 20 to better illuminate the position of the winding needle 30, improving the brightness of the area of ​​the winding needle 30. Furthermore, the light source component 20 facing away from the vision detection component 10 reduces the risk of stray light illuminating the vision detection component 10, thus avoiding the problem of poor imaging caused by direct illumination of the vision detection component 10 by the light source component 20. It should be noted that the first direction is parallel to the sliding direction of the vision detection component 10.

[0054] Furthermore, based on the above embodiments, the light source assembly 20 is positioned closer to the winding needle 30 in the first direction relative to the vision detection assembly 10, so as to further enhance the effect of the light source assembly 20 on the winding needle 30 and optimize the imaging effect of the vision detection assembly 10.

[0055] Furthermore, such as Figure 8 As shown, another aspect of this disclosure provides a cylindrical battery cell winding inspection system. This system includes a tab detection mechanism 40 as described in any of the above embodiments. The tab detection mechanism 40 is disposed on one side of the winding needle 30 to perform morphological detection on the stacking process of the tabs 310 on the winding needle 30. It can detect the stacking state of each layer of tabs 310 during the stacking process, and provide feedback on whether the tabs 310 have folded or collapsed during the stacking process. It identifies the location and number of layers where the tab 310 problem occurs and provides feedback to the operator to take corrective action or stop the machine and scrap it. It should be noted that since the tab detection mechanism 40 has the technical effects provided in any of the above embodiments, the cylindrical battery cell winding inspection system also has the technical effects provided in any of the above embodiments, which will not be repeated here.

[0056] Based on the above embodiments, in some embodiments of this disclosure, the cylindrical cell winding inspection system further includes a front-end inspection mechanism 50. The front-end inspection mechanism 50 is located at the last roller before the tab 310 is wound, in order to inspect the shape of the tab 310 that is about to be wound. Combined with the tab inspection mechanism 40 provided in the aforementioned embodiments, it can perform all-round inspection of the shape of the tab 310 before and during the winding process, so that the cylindrical cell winding inspection system has richer process inspection functions and can provide timely feedback on the state of the tab 310 at different stages and take corresponding measures to ensure the smooth production of cylindrical cells.

[0057] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may not be defined in the listed steps or units, but may include steps or units not listed.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tab detection mechanism for detecting tabs (310) stacked on a winding needle (30), characterized in that, include: The visual inspection component (10) and the light source component (20) are both inclined to the axis of the winding needle (30) and both pass through the stacking area of ​​the tab (310). The obtuse angle between the illumination path of the light source assembly (20) and the axis of the winding needle (30) is greater than the obtuse angle between the detection path of the visual detection assembly (10) and the axis of the winding needle (30).

2. The tab detecting mechanism according to claim 1, wherein The obtuse angle α between the illumination path of the light source assembly (20) and the axis of the winding needle (30) is 30 degrees, and the difference α-β between the obtuse angle β between the detection path of the visual detection assembly (10) and the axis of the winding needle (30) is 30 degrees to 60 degrees.

3. The tab detecting mechanism according to claim 2, wherein The obtuse angle α between the illumination path of the light source assembly (20) and the axis of the winding needle (30) is in the range of 120 degrees to 175 degrees.

4. The tab detecting mechanism according to claim 2, wherein The obtuse angle β between the detection path of the visual detection component (10) and the axis of the coil needle (30) is in the range of 100-145 degrees.

5. The tab detecting mechanism according to claim 1, wherein The obtuse angle between the detection path of the visual detection component (10) and the axis of the winding needle (30) is greater than the maximum collapse angle of the tab (310).

6. The tab detecting mechanism according to claim 1, wherein The visual inspection component (10) includes a line scan camera (110), and the light source component (20) includes a line scan light source (210).

7. The tab detecting mechanism according to claim 6, wherein The vertical distance L1mm between the lens of the line scan camera (110) and the electrode (310) being detected ranges from 150mm to 300mm.

8. The tab detecting mechanism according to claim 6, wherein The vertical distance L2mm between the emitting end of the line scan light source (210) and the electrode (310) being detected ranges from 20mm to 100mm.

9. The tab detecting mechanism according to claim 1, wherein The distance L3mm between the detection end of the visual inspection component (10) and the tab (310) of the layer being inspected remains fixed.

10. The tab detecting mechanism according to claim 9, wherein The L3mm range is 180mm-350mm.

11. The electrode detection mechanism as described in claim 9, characterized in that, The visual inspection component (10) includes a slide (120), a support (130) slidably disposed along the slide (120), and a detection unit (140) disposed on the support (130). The support (130) is perpendicular to the axis of the winding needle (30) along the sliding direction of the slide (120). The support base (130) is driven by a servo motor (150) to move the detection unit (140) away from the winding needle (30) in real time during the stacking of the tabs (310).

12. The electrode detection mechanism as described in claim 11, characterized in that, A bearing plate (160) is slidably disposed on the support base (130). The bearing plate (160) is parallel to the axis of the winding needle (30) along the sliding direction of the support base (130). The detection unit (140) is disposed on the bearing plate (160).

13. The tab detecting mechanism according to claim 12, wherein The detection unit (140) is rotatably mounted on the support plate (160) via a rotating assembly. The rotating assembly includes a first rotating column (170) and a second rotating column (180). The first rotating column (170) and the second rotating column (180) are vertically arranged and connected by a support clamp (190). Both the first rotating column (170) and the second rotating column (180) are capable of rotating along their respective axes. The first rotating column (170) is rotatably mounted on the support plate (160), and the detection unit (140) is fixedly mounted on the second rotating column (180).

14. The tab detection mechanism of claim 1, wherein Along the first direction, the light source assembly (20) is disposed between the vision detection assembly (10) and the winding needle (30).

15. The tab detection mechanism of claim 14, wherein The light source assembly (20) is positioned closer to the winding needle (30) in the first direction relative to the visual detection assembly (10).

16. A cylindrical cell winding detection system, comprising: Includes a tab detection mechanism (40) as described in any one of claims 1-15, wherein the tab detection mechanism (40) is disposed on one side of the winding needle (30) and detects the stacking pattern of the tabs (310) at the position of the winding needle (30).

17. The cylindrical cell winding detection system of claim 16, wherein, It also includes a front inspection mechanism (50) located at the last roller before the tab (310) is wound, the front inspection mechanism (50) being used to detect the shape of the tab (310) before it is wound.

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