Tab detection device and winding apparatus

Abstract

The application discloses a tab detection device and a winding equipment. The tab part extends from the battery body along a first direction. The tab detection device comprises a conveying mechanism and a first vision camera. The conveying mechanism has a visual detection station. The conveying mechanism is used for carrying the electrode assembly and transporting the electrode assembly to the visual detection station. The first vision camera is arranged at the visual detection station. In the state that the conveying mechanism transports the electrode assembly to the visual detection station, the first vision camera is located at the side of the tab part away from the battery body. In the first direction, the orthographic projection of the first vision camera on the tab part at least partially overlaps the tab part. In the state that the conveying mechanism transports the electrode assembly to the visual detection station, the first vision camera is located at the side of the tab part away from the battery body, so that the first image with the independent edge profile of the multi-layer tab can be acquired, and the problem of the visual blind area caused by the overlapping of the multi-layer tab is reduced, thereby providing the image data basis for subsequent misalignment analysis.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a tab detection device. Background Technology

[0002] Electrode assemblies can be formed using processes such as winding or stacking. However, electrode assemblies formed by these processes are prone to multi-layer tab misalignment. Current automated detection methods for multi-layer tab misalignment suffer from visual blind spots due to overlapping tabs. Utility Model Content

[0003] In view of the above problems, this application provides a tab detection device to solve the problem of visual blind spots caused by the overlap of multiple tabs in the existing automated detection process of multi-layer tab misalignment.

[0004] To address the aforementioned technical problems, this application provides a tab detection device. The electrode assembly includes a battery cell body and tabs, with the tabs extending from the battery cell body along a first direction. The tab detection device includes: a conveying mechanism with a visual inspection station; the conveying mechanism carries the electrode assembly and transports it to the visual inspection station; a first visual camera is positioned at the visual inspection station; when the conveying mechanism transports the electrode assembly to the visual inspection station, the first visual camera is located on the side of the tab away from the battery cell body; the tab is located within the imaging field of view of the first visual camera, which is used to acquire a first image of the tab; along the first direction, the orthographic projection of the first visual camera onto the tab at least partially overlaps with the tab. By limiting the first visual camera to the side of the tab away from the battery cell body and ensuring that the orthographic projection of the first visual camera along the first direction at least partially overlaps with the tab, a first image with independent edge contours of multiple tabs can be acquired, thereby reducing the visual blind spot caused by overlapping multiple tabs and providing an image data basis for subsequent misalignment analysis. By limiting the orthographic projection of the first visual camera onto the tab to at least partially overlap with the tab, not only is the tab brought into the imaging field of view, reducing the risk of the tab leaving the imaging field of view, but the tab is also placed in the central imaging area, reducing the risk of distortion and improving resolution, thereby providing more reliable image data for subsequent processing.

[0005] In some embodiments, a first tab and a second tab are provided on one side of the battery cell body; along a first direction, the orthographic projection of a first vision camera onto the first tab and the second tab is located at the midpoint between the first tab and the second tab. By limiting the orthographic projection of the lens onto the first tab and the second tab to the midpoint between the first tab and the second tab, not only can the contours of the first tab and the second tab be detected simultaneously, but the detection cycle can also be reduced.

[0006] In some embodiments, a first tab is provided on one side of the battery cell body along a first direction, and a second tab is provided on the other side of the battery cell body along the first direction. The tab detection device includes two first vision cameras. One first vision camera is located on the side of the first tab away from the battery cell body. Along the first direction, the orthographic projection of the first vision camera on the first tab at least partially overlaps with the first tab. Along the first direction, the other first vision camera is located on the other side of the second tab away from the battery cell body, and the orthographic projection of the other first vision camera on the second tab at least partially overlaps with the second tab. By providing corresponding first vision cameras on different sides of the battery cell body and limiting the orthographic projection of the first vision camera on the corresponding tab to at least partially overlap with the corresponding tab, not only can the contours of the first and second tabs be captured without any acquisition obstruction, but the magnification can also be increased to improve detection accuracy. At the same time, optical path interference between the two different tabs can also be reduced.

[0007] In some embodiments, the first vision camera includes an image sensor, the imaging surface of which is parallel to one side of the battery cell body. By defining the imaging surface of the image sensor as parallel to one side of the battery cell body, the electrode object distance is equal, the magnification is uniform, the imaging clarity is consistent, and the illumination is uniform, thereby improving image quality.

[0008] In some embodiments, the conveying mechanism includes a bearing surface that intersects a vertical direction; a first vision camera is disposed on one side of the conveying mechanism along a second direction; wherein the second direction is parallel to the bearing surface and perpendicular to the operating direction of the conveying mechanism, and the second direction is parallel to the first direction. When the electrode assembly lies flat or stands on its side on the bearing surface, the first vision camera is disposed on one side of the conveying mechanism along the second direction, so that the first vision camera faces the contours of the multi-layer electrode tabs, thereby clearly distinguishing the independent edge contours of the multi-layer electrode tabs, thereby reducing the problem of visual blind spots caused by the overlap of the multi-layer electrode tabs, thus providing an image data basis for subsequent misalignment analysis. In addition, the fact that the electrode assembly on the conveying mechanism lies flat and the first vision camera is located on one side of the conveying mechanism can reduce the space occupied above the conveying mechanism.

[0009] In some embodiments, a first vision camera is used to acquire a first image during the movement of the conveyor mechanism relative to the first vision camera. By moving the conveyor mechanism relative to the first vision camera, continuous or multiple frames of the first image can be acquired, thereby obtaining clearer independent edge contours of the multi-layer tabs and providing higher quality data for subsequent misalignment analysis. While ensuring the clarity and integrity of the first image, the resolution requirement of the first vision camera can be reduced, thereby lowering production costs; simultaneously, the distance between the first vision camera and the conveyor mechanism can be shortened, thus reducing space occupation, etc.

[0010] In some embodiments, the conveying mechanism is configured to transport the electrode assembly to the visual inspection station, pause for a preset time, and then move the electrode assembly away from the visual inspection station. The electrode tab detection device includes a driving component connected to a first visual camera, which drives the first visual camera to move along the running direction of the conveying mechanism, so that the first visual camera acquires a first image during the movement. By limiting the conveying mechanism to pause at the visual inspection station for a preset time, and driving the first visual camera to move along the running direction, the first visual camera acquires the complete contour of the electrode tab, thereby reducing the imaging field of view under a fixed viewing angle. This achieves full-range and high-precision measurement of the electrode tab misalignment, solving the problem of limited imaging field of view for a stationary first visual camera. In addition, the stationary conveying mechanism and the moving first visual camera not only make the electrode assembly more stable, thereby improving the stability of image acquisition, but also expand the detection range through the scanning motion of the first visual camera, which is beneficial for providing a higher quality image data foundation for subsequent processing.

[0011] In some embodiments, the conveying mechanism includes a conveyor belt, a drive roller, and an encoder. The conveyor belt is fitted onto the drive roller, and the encoder is disposed on the drive roller. The drive roller drives the conveyor belt to move, and the encoder moves synchronously with the drive roller to detect the rotation angle of the drive roller in real time and determine the position of the electrode assembly on the conveyor belt. In response to the electrode assembly being transported to the vision inspection station by the conveyor belt, the encoder sends a trigger signal to the first vision camera to activate the first vision camera to acquire a first image of the electrode tab. By limiting the conveyor belt to be fitted onto the drive roller, and the encoder to move synchronously with the drive roller and detect the rotation angle in real time, the first vision camera is triggered to acquire a first image of the electrode tab when the electrode assembly accurately reaches the vision inspection station. This improves the accuracy of image acquisition timing and reduces the risk of missed or false detections due to inaccurate positioning.

[0012] In some embodiments, the first visual camera includes a line scan camera or an area scan camera, which acquires the first image. By defining the first visual camera as a line scan camera, the line scan camera has characteristics such as ultra-high lateral resolution, an infinite longitudinal imaging field of view, and uniform lateral pixels. Alternatively, the first visual camera includes an area scan camera, which can output a complete rectangular two-dimensional image and has characteristics such as uniform imaging and minimal distortion.

[0013] To address the aforementioned technical problems, this application provides a winding device for manufacturing electrode assemblies. The winding device includes a turret that moves to a feeding station; and the aforementioned tab detection device, wherein a conveying mechanism within the tab detection device carries the electrode assembly at the feeding station. Through the combined action of the turret and the tab detection device, the winding device can acquire a first image with independent edge contours of multiple tabs, thereby reducing the visual blind spots caused by overlapping multiple tabs and providing an image data basis for subsequent misalignment analysis.

[0014] In some embodiments, the winding apparatus further includes an industrial computer and a controller. The industrial computer is connected to a first vision camera and is used to calculate a first misalignment amount based on a first image. The industrial computer is also connected to the controller and is used to feed back the first misalignment amount to the controller. The controller is used to control the operation of the winding apparatus according to the first misalignment amount. Through the combined action of the industrial computer, the controller, and the first vision camera, the misalignment amount of the tab can be controlled in real time.

[0015] In some embodiments, the controller is configured to: issue a first warning via an alarm unit in response to a first misalignment amount being greater than a first threshold and less than or equal to a second threshold; and control a diameter adjustment assembly to adjust the diameter of the main winding needle on the turret in response to the first misalignment amount being greater than the second threshold, and issue a second warning via the alarm unit. By setting a first threshold and a second threshold to classify the first misalignment amount, the winding equipment can take corresponding measures for different degrees of misalignment, reducing frequent shutdowns for adjustments due to minor misalignments, thereby improving production efficiency and equipment utilization.

[0016] In some embodiments, the winding apparatus further includes a feeding mechanism, a pre-pressing mechanism, a transfer mechanism, and a second vision camera; the feeding mechanism is used to transfer the electrode assembly on the turret to the pre-pressing mechanism; the pre-pressing mechanism is used to pre-press the electrode assembly; the transfer mechanism is used to transfer the pre-pressed electrode assembly to the conveying mechanism; and the second vision camera is used to acquire a second image of the tab portion of the electrode assembly during the pre-pressing process. By limiting the use of the second vision camera to acquire a second image of the tab portion of the electrode assembly during the pre-pressing process, it is possible not only to acquire the influence of the pre-pressing action on the position of the tab portion and obtain misalignment data that is closer to the final shape of the electrode assembly, but also to acquire a second image with independent edge contours of multiple tabs, thereby reducing the problem of visual blind spots caused by the overlap of multiple tabs, thus providing an image data basis for subsequent misalignment analysis.

[0017] In some embodiments, the turret is equipped with a main winding needle, which rotates with the turret. The winding device also includes a third vision camera and a controller. The third vision camera is used to acquire a third image of the tab of the electrode sheet before it enters the main winding needle and / or a fourth image of the tab of the electrode sheet during the winding process on the main winding needle. The controller is connected to the third vision camera and is used to acquire the third and / or fourth images and calculate a second misalignment amount, and calculate the diameter change amount of the next main winding needle based on the second misalignment amount. The controller calculates the second misalignment amount based on the third and / or fourth images. The second misalignment amount includes the misalignment amount of the tab and the misalignment direction of the tab, etc. The controller can calculate the second misalignment amount in real time, such as updating the calculation cycle once per winding turn, to ensure the real-time performance of the data.

[0018] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a first partial top view of the first embodiment of the tab detection device of this application; Figure 2 This is a second partial top view of the first embodiment of the tab detection device of this application; Figure 3 This is a partial side view of the first embodiment of the tab detection device of this application; Figure 4 This is a partial top view of the second embodiment of the tab detection device of this application; Figure 5 This is a partial side view of the second embodiment of the tab detection device of this application; Figure 6 This is a partial top view of the third embodiment of the tab detection device of this application; Figure 7 This is a partial top view of the fourth embodiment of the tab detection device of this application; Figure 8 This is a partial top view of the fifth embodiment of the tab detection device of this application; Figure 9 This is a partial side view of the first embodiment of the winding device of this application; Figure 10 This is a schematic diagram of the first image in this application; Figure 11 This is a partial side view of the second embodiment of the winding device of this application; Figure 12 This is a partial side view of the third embodiment of the winding device of this application.

[0020] The reference numerals in the detailed embodiments are as follows: 10, tab detection device; 11, turret plate; 111, main winding needle; 12, conveying mechanism; 121, conveyor belt; 1211, bearing surface; 13, first vision camera; 131, image sensor; 14, third vision camera; 15, pre-compression mechanism; 191, unloading station; 192, vision inspection station; 20, electrode assembly; 201, cell body; 202, tab part; 2021, tab; 100, winding equipment. Detailed Implementation

[0021] The embodiments of the technical solution of this application will be described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples, and should not be used to limit the scope of protection of this application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, unless otherwise explicitly specified, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple pieces" refers to two or more pieces (including two pieces).

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0026] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0027] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0028] Electrode assemblies can be formed using processes such as winding or stacking. However, electrode assemblies formed by these processes are prone to multi-layer tab misalignment. Current automated detection methods for multi-layer tab misalignment suffer from visual blind spots due to overlapping tabs.

[0029] To address the problem of visual blind spots caused by overlapping multiple electrodes in existing automated detection processes for multi-layer electrode misalignment, this application provides an electrode detection device. The electrode assembly includes a battery cell body and electrode tabs, with the electrode tabs extending from the battery cell body along a first direction. The electrode detection device includes: a conveying mechanism with a visual inspection station; the conveying mechanism is used to carry the electrode assembly and transport it to the visual inspection station; a first visual camera is disposed at the visual inspection station; the first visual camera is located on the side of the electrode tab away from the battery cell body; along the first direction, the orthographic projection of the first visual camera at least partially overlaps with the orthographic projection of the electrode tab; the first visual camera is used to acquire a first image of the electrode tab.

[0030] By positioning the first visual camera on the side of the tab away from the cell body, and by having the orthographic projection of the first visual camera along the first direction on the tab at least partially overlap with the tab, a first image with independent edge contours of multiple tabs can be acquired, thereby reducing the problem of visual blind spots caused by the overlap of multiple tabs, thus providing an image data basis for subsequent misalignment analysis.

[0031] Please see Figure 1 , Figure 2 as well as Figure 3 , Figure 1 This is a first partial top view of the first embodiment of the tab detection device of this application; Figure 2 This is a second partial top view of the first embodiment of the tab detection device of this application; Figure 3 This is a partial side view of a first embodiment of the electrode detection device of this application. This application provides an electrode detection device. The electrode assembly 20 includes a cell body 201 and an electrode tab 202. The electrode tab 202 extends from the cell body 201 along a first direction. The electrode detection device 10 includes a conveying mechanism 12 and a first vision camera 13. The conveying mechanism 12 has a vision inspection station 192. The conveying mechanism 12 is used to carry the electrode assembly 20 and transport the electrode assembly 20 to the vision inspection station 192. The first vision camera 13 is disposed at the vision inspection station 192. When the conveying mechanism 12 transports the electrode assembly 20 to the vision inspection station 192, the first vision camera 13 is located on the side of the electrode tab 202 away from the cell body 201. The electrode tab 202 is located within the imaging field of view of the first vision camera 13, and the first vision camera 13 is used to acquire a first image of the electrode tab 202.

[0032] The electrode assembly 20 can be formed by winding or stacking processes. The tab 202 extends along a first direction and connects to the cell body 201. The first direction can be, but is not limited to, a front-to-back direction, a top-to-bottom direction, etc. The cell body 201 can be, but is not limited to, a pouch cell, a prismatic cell, a cylindrical cell, and a blade cell, etc. The tab 202 can be located on one side or the other side of the cell body 201. When there are two tabs 202, both tabs 202 can be connected to one side of the cell body 201; or, both tabs 202 can be connected to the other side of the cell body 201; or, one tab 202 is connected to one side of the cell body 201, and the other tab 202 is connected to the other side of the cell body 201. Each tab 202 includes at least two layers of tabs 2021. Each tab 202 can include, but is not limited to, two, three, or four or more layers of tabs 2021, etc.

[0033] The conveying mechanism 12 is used to carry and transport the electrode assembly 20. The conveying mechanism 12 can be, but is not limited to, a belt conveyor (not shown in the figure), a high-speed chain conveyor (not shown in the figure), a pallet transfer conveyor (not shown in the figure), or a robotic arm (not shown in the figure). The vision inspection station 192 is the defined position of the conveying mechanism 12. When the conveying mechanism 12 transports the electrode assembly 20 to the vision inspection station 192, it can trigger the first vision camera to acquire data or drive the first vision camera to move.

[0034] The first visual camera 13 is a device that uses optical imaging principles to control light and record images. The first visual camera 13 is used to acquire the first image of the electrode 202 transported by the conveyor mechanism 12 to the visual inspection station 192. The imaging field of view of the first visual camera 13 is the spatial range within which the first visual camera 13 can image and acquire effective pixels. During the acquisition process, the electrode 202 is located within the imaging field of view of the first visual camera 13.

[0035] The number of the aforementioned first visual cameras 13 can be one, two, or more. The number of first visual cameras 13 can be related to the number of tabs 202 and the spacing between adjacent tabs 202, and is not limited here. The first visual camera 13 can be an area scan camera (not shown in the figure) or a line scan camera (not shown in the figure). The first image can include the outline of the tabs 202 on one or the other side of the cell body 201, the spacing between the tabs 202, and the independent edge features of the multi-layer tabs 2021, etc.

[0036] With the electrode assembly 20 transported to the visual inspection station 192 by the conveying mechanism 12, the first visual camera 13 is located on the side of the tab 202 away from the cell body 201, and at this time, the first visual camera 13 is directly facing the outline of the multilayer tab 2021. The position of the first visual camera 13 is related to the orientation of the electrode assembly 20 on the conveying mechanism 12. For example, the electrode assembly 20 can be positioned on the conveying mechanism 12 in a lying or sideways orientation.

[0037] During the operation of the electrode detection device 10, the conveying mechanism 12 transports the electrode assembly 20 to the vision inspection station 192, and the first vision camera 13 is triggered to capture the first image of the electrode portion 202. Since the first vision camera 13 is located on the side of the electrode portion 202 away from the cell body 201, and the electrode portion 202 is located within the imaging field of view of the first vision camera 13, the first image can clearly show the independent edge contours of the multiple layers of electrodes 2021 (such as positive electrodes and negative electrodes).

[0038] By limiting the first visual camera 13 to the side of the tab 202 away from the cell body 201, and with the tab 202 located within the imaging field of view of the first visual camera 13, a first image with independent edge contours of multiple tabs 2021 can be acquired, thereby reducing the problem of visual blind spots caused by the overlap of multiple tabs 2021, thus providing an image data basis for subsequent misalignment analysis.

[0039] In some embodiments, along a first direction, the orthographic projection of the first visual camera 13 onto the tab 202 at least partially overlaps with the tab 202.

[0040] Wherein, the pattern obtained by the first visual camera 13 projecting perpendicularly onto the tab 202 along the first direction at least partially overlaps with the tab 202. For example, the orthographic projection of the first visual camera 13 onto the tab 202 along the first direction partially overlaps with the tab 202; or, the orthographic projection of the first visual camera 13 onto the tab 202 along the first direction completely overlaps with the tab 202, which is not limited here.

[0041] By ensuring that the orthographic projection of the first visual camera 13 onto the tab 202 at least partially overlaps with the tab 202, not only is the tab 202 placed within the imaging field of view, reducing the risk of the tab 202 falling out of the imaging field of view, but the tab 202 is also positioned in the central imaging region, reducing the risk of distortion and improving resolution, thereby providing more reliable image data for subsequent processing. Furthermore, by ensuring that the orthographic projection of the first visual camera 13 onto the tab 202 at least partially overlaps with the tab 202, the positioning requirements of the electrode assembly 20 and the tolerance requirements for the installation of the first visual camera 13 can be reduced.

[0042] Continue reading Figures 1 to 3 In some embodiments, a first tab (not shown in the figure) and a second tab (not shown in the figure) are provided on one side of the battery cell body 201. Along the first direction, the orthographic projection of the first visual camera 13 is located at the middle position between the first tab and the second tab.

[0043] The first electrode tab can be a positive electrode tab (not shown in the figure), and the second electrode tab can be a negative electrode tab (not shown in the figure). Alternatively, the first electrode tab can be a negative electrode tab, and the second electrode tab can be a positive electrode tab. Both the first electrode tab and the second electrode tab are located on the same side of the cell body 201. Adjacent first electrode tabs and second electrode tabs are spaced apart.

[0044] Along the first direction, the orthographic projection of the first visual camera 13 is located at the midpoint between the first and second electrodes. That is, the first visual camera 13 is centrally positioned, which not only ensures that the imaging field of view is evenly divided, allowing the first image to simultaneously display the first and second electrodes, but also enables symmetrical imaging and improves measurement accuracy.

[0045] By positioning the orthographic projection of the first visual camera 13 at the midpoint between the first and second awls, it not only simultaneously detects the contours of the first and second awls, but also reduces the detection cycle.

[0046] In other embodiments, along the first direction, the orthographic projection of the first visual camera 13 onto the first awl and the second awl is located between the first awl and the second awl and close to the first awl, so that the first visual camera 13 can simultaneously capture the contours of the first awl and the second awl.

[0047] In some other embodiments, along the first direction, the orthographic projection of the first visual camera 13 onto the first anode and the second anode is located between the first anode and the second anode and close to the second anode, so that the first visual camera 13 can simultaneously capture the contours of the first anode and the second anode.

[0048] Specifically, the first vision camera 13 includes a lens (not shown in the figure). The lens is the core optical component used for imaging. The lens is used to converge and refract light from external objects to form a clear, reduced real image on the image sensor 131. Along the first direction, the orthographic projection of the lens onto the first and second tabs is located at the midpoint between the first and second tabs. That is, the lens is centrally positioned, which not only ensures an evenly divided imaging field of view, allowing the first image to simultaneously display both the first and second tabs, but also enables symmetrical imaging and improves measurement accuracy.

[0049] The number of the aforementioned first visual cameras 13 can be one or two, etc. The electrode detection device 10 may include one first visual camera 13, with the first electrode portion and the second electrode portion both located on the same side of the cell body 201. When the first electrode portion and the second electrode portion are within the imaging field of view of the first visual camera 13, the orthographic projection of the first visual camera 13 onto the first electrode portion and the second electrode portion is located between the first electrode portion and the second electrode portion.

[0050] The tab detection device 10 may include two first vision cameras 13, with both the first tab and the second tab located on the same side of the cell body 201. When at least one of the first tab and the second tab is outside the imaging field of view of the first vision camera 13, one first vision camera 13 is located on the side of the first tab away from the cell body 201; the orthographic projection of the first vision camera 13 along a first direction at least partially overlaps with the first tab. The other first vision camera 13 is located on the side of the second tab away from the cell body 201; the orthographic projection of the other first vision camera 13 along the first direction at least partially overlaps with the second tab. Through the above limitations, not only can the magnification be increased and the detection accuracy improved, but the tab 202 is also positioned at the imaging center, reducing the risk of distortion, etc.; at the same time, optical path interference between different tabs 202 can also be reduced.

[0051] See Figure 4 and Figure 5 , Figure 4 This is a partial top view of the second embodiment of the tab detection device of this application; Figure 5 This is a partial side view of the second embodiment of the tab detection device of this application. (In conjunction with...) Figures 1 to 3 In some embodiments, a first tab is provided on one side of the battery cell body 201 along a first direction. A second tab is provided on the other side of the battery cell body 201 along the first direction. The tab detection device 10 includes two first vision cameras 13. One first vision camera 13 is located on the side of the first tab away from the battery cell body 201. Along the first direction, the orthographic projection of the first vision camera 13 onto the first tab at least partially overlaps with the first tab. The other first vision camera 13 is located on the other side of the second tab away from the battery cell body 201. Along the first direction, the orthographic projection of the other first vision camera 13 onto the second tab at least partially overlaps with the second tab.

[0052] The first tab and the second tab are located on different sides of the battery cell body 201. Two first vision cameras 13 respectively capture first images of the first tab and the second tab. The orthographic projection of one first vision camera 13 along a first direction onto the first tab partially or completely overlaps with the first tab. The orthographic projection of the other first vision camera 13 along the first direction onto the second tab partially or completely overlaps with the second tab.

[0053] By setting corresponding first vision cameras 13 on different sides of the cell body 201, and limiting the orthographic projection of the first vision camera 13 on the corresponding tab to at least partially overlap with the corresponding tab 202, it is possible not only to capture the outlines of the first tab and the second tab without any capture obstruction, but also to increase the magnification and improve the detection accuracy; and at the same time, it can reduce the optical path interference of the different tabs 202 on both sides.

[0054] Please see Figure 6 and Figure 7 , Figure 6 This is a partial top view of the third embodiment of the tab detection device of this application; Figure 7 This is a partial top view of the fourth embodiment of the tab detection device of this application. (In conjunction with...) Figures 1 to 5 In some embodiments, the first vision camera 13 includes an image sensor 131. The imaging surface of the image sensor 131 (not shown in the figure) is parallel to one side of the battery cell body 201.

[0055] The image sensor 131 converts light signals into electrical signals. The imaging surface is the effective photosensitive area of ​​the image sensor 131; all light rays projected by the lens fall on this effective photosensitive area, ultimately forming a complete image. The imaging surface of the image sensor 131 is parallel to one side of the battery cell body 201. The aforementioned tab 202 is provided on one side of the battery cell body 201. And / or, the imaging surface of the image sensor 131 is parallel to the other side of the battery cell body 201. The aforementioned tab 202 is provided on the other side of the battery cell body 201.

[0056] By ensuring that the imaging surface of the image sensor 131 is parallel to one side of the battery cell body 201, the object distance between the electrodes is equal, the magnification is uniform, the imaging clarity is consistent, and the illumination is uniform, thereby improving the image quality.

[0057] When the side of the lens facing away from the image sensor 131 is flat, the front end of the lens is parallel to one side of the battery cell body 201. The aforementioned tab 202 is provided on one side of the battery cell body 201. Alternatively, when the front end of the lens is curved, the tangent to the center line of the side of the lens facing away from the image sensor 131 is parallel to one side of the battery cell body 201. The aforementioned tab 202 is provided on one side of the battery cell body 201.

[0058] In some embodiments, the conveying mechanism 12 includes a bearing surface 1211. The bearing surface 1211 intersects the vertical direction. A first vision camera 13 is disposed on one side of the conveying mechanism 12 along a second direction Y. The second direction Y is parallel to the bearing surface 1211 and perpendicular to the operating direction X of the conveying mechanism 12. The second direction Y is parallel to the first direction.

[0059] The bearing surface 1211 is a plane used to support and transport the electrode assembly 20. The bearing surface 1211 can be perpendicular to the vertical direction Z; alternatively, it can be at an angle to the vertical direction Z, which is not limited here. That is, the bearing surface 1211 can be horizontal or inclined. The second direction Y is parallel to the bearing surface 1211 and perpendicular to the running direction X.

[0060] The second direction Y is parallel to the first direction, and the tab 202 extends along the second direction Y. At this time, the electrode assembly 20 lies flat or stands on its side on the support surface 1211. Specifically, when the electrode assembly 20 lies flat on the support surface 1211, the main surface of the cell body 201 lies on the support surface 1211 and is parallel to the second direction Y, with the tab 202 facing the support surface 1211. Alternatively, when the electrode assembly 20 stands on its side on the support surface 1211, the narrow side of the cell body 201 is located on the conveying mechanism 12 and is parallel to the second direction Y, with the tab 202 facing the support surface 1211.

[0061] The first vision camera 13 is located on one side of the conveying mechanism 12, that is, on the side of the bearing surface 1211. When the flat electrode assembly 20 arrives at the vision inspection station 192, the first vision camera 13 scans or takes a picture of the tab portion 202. Since the second direction Y is perpendicular to the running direction X and parallel to the bearing surface 1211, the first vision camera 13 is directly facing the outline of the tab portion 202 at this time.

[0062] When the electrode assembly 20 lies flat or stands on its side on the bearing surface 1211, along the second direction Y, the first visual camera 13 is positioned on one side of the conveying mechanism 12, so that the first visual camera 13 faces the outline of the multilayer tab 2021, thereby clearly distinguishing the independent edge outline of the multilayer tab 2021, thus reducing the visual blind spot caused by the overlap of the multilayer tabs, and providing an image data basis for subsequent misalignment analysis. In addition, the fact that the electrode assembly 20 on the conveying mechanism 12 lies flat and the first visual camera 13 is located on one side of the conveying mechanism 12 can reduce the space occupied above the conveying mechanism 12.

[0063] In other embodiments, the electrode detection device 10 includes a first visual camera 13. When the electrode assembly 20 lies flat or stands on its side on the support surface 1211, both the first and second electrode tabs are connected to the other side of the cell body 201. Along the second direction Y, the first visual camera 13 is disposed on the other side of the conveying mechanism 12.

[0064] Alternatively, the electrode detection device 10 includes two first vision cameras. When the electrode assembly 20 lies flat or stands on its side on the support surface 1211, the first electrode tab is connected to one side of the cell body 201, and the second electrode tab is connected to the other side of the cell body 201. Along the second direction Y, one first vision camera 13 is disposed on one side of the conveying mechanism 12, and the other first vision camera 13 is disposed on the other side of the conveying mechanism 12.

[0065] In some other embodiments, the conveying mechanism 12 includes a bearing surface 1211. The bearing surface 1211 intersects the vertical direction Z. A first vision camera 13 is disposed above the conveying mechanism 12 along a direction perpendicular to the bearing surface 1211. The first direction is perpendicular to the bearing surface 1211.

[0066] The electrode assembly 20 is vertically positioned on the bearing surface 1211, and the battery cell body 201 is also vertically positioned. The lower end face of the battery cell body 201 is on the bearing surface 1211 and parallel to the second direction Y. The tab portion 202 is located at the end of the battery cell body 201 facing away from the bearing surface 1211. Along a direction perpendicular to the bearing surface 1211, the first visual camera 13 is positioned above the conveying mechanism 12, so that the first visual camera 13 faces the outline of the tab portion 202, thereby clearly distinguishing the independent edge outlines of the multi-layer tabs 2021, providing an image data basis for subsequent misalignment analysis.

[0067] The position of the first vision camera 13 at the vision inspection station 192 is related to the orientation of the electrode assembly 20 on the conveying mechanism 12. As long as the first vision camera 13 is located on the side of the tab 202 away from the battery cell body 201 and the orthographic projection of the first vision camera 13 along the first direction on the tab 202 at least partially overlaps with the tab 202.

[0068] In some embodiments, when the dimension of the electrode assembly 20 along the first direction is smaller than the dimension of the bearing surface 1211 along the second direction Y, the electrode assembly 20 lies flat or stands on its side on the bearing surface 1211, wherein the extension direction of the tab 202 may be parallel to the second direction Y, and the tab 202 faces the first vision camera 13. The electrode assembly 20 described above may be, but is not limited to, a pouch cell, a prismatic cell, etc.

[0069] In other embodiments, when the dimension of the electrode assembly 20 along the first direction is larger than the dimension of the bearing surface 1211 along the second direction Y, the electrode assembly 20 lies flat or stands on its side on the bearing surface 1211, wherein the extension direction of the tab 202 is parallel to the running direction X. When the electrode assembly 20 approaches or reaches the vision inspection station 192, the rotation mechanism rotates the electrode assembly 20 so that the tab 202 on the electrode assembly 20 faces the corresponding first vision camera 13. The electrode assembly described above can be, but is not limited to, a blade battery cell. The blade battery cell can be an ultra-thin, long, flat aluminum-cased square battery cell.

[0070] Continue reading Figures 1 to 7 In some embodiments, the first vision camera 13 is used to acquire a first image of the tab 202 during the movement of the conveyor 12 relative to the first vision camera 13.

[0071] The first visual camera 13 can be mounted on a frame (not shown in the figure). The position of the first visual camera 13 remains stationary relative to the ground.

[0072] When the electrode assembly 20 passes through the vision inspection station 192 with the conveyor mechanism 12, the stationary first vision camera 13 is triggered. Since the first vision camera 13 is stationary relative to the ground, while the electrode assembly 20 moves to the vision inspection station 192 at a constant or variable speed driven by the conveyor mechanism 12, the first vision camera 13 acquires the complete outline of the tab 202 line by line; or, the first vision camera 13 captures a single frame or multiple frames of images instantaneously when the electrode assembly 20 passes through the vision inspection station 192.

[0073] By moving the conveyor mechanism 12 relative to the first vision camera 13, continuous or multi-frame first images can be acquired, thereby obtaining clearer independent edge contours of the multi-layer tabs 2021 and providing higher quality data for subsequent misalignment analysis. While ensuring the clarity and integrity of the first images, the resolution requirement of the first vision camera 13 can be reduced, thus lowering production costs; simultaneously, the distance between the first vision camera 13 and the conveyor mechanism 12 can be shortened, thereby reducing space occupation, etc.

[0074] Please see Figure 8 , Figure 8 This is a partial top view of the fifth embodiment of the tab detection device of this application. (In conjunction with...) Figures 1 to 7 In some embodiments, the conveying mechanism 12 is configured to transport the electrode assembly 20 to the visual inspection station 192, pause for a preset time, and then transport the electrode assembly 20 away from the visual inspection station 192. The electrode detection device 10 includes a driving component (not shown in the figure). The driving component is connected to a first visual camera 13 and is used to drive the first visual camera 13 to move along the running direction X of the conveying mechanism 12, so that the first visual camera 13 acquires a first image during the movement.

[0075] The conveying mechanism 12 can move intermittently. The preset duration refers to the time period during which the conveying mechanism 12 remains stationary after transporting the electrode assembly 20 to the vision inspection station 192. This preset duration can be determined based on the movement duration of the first vision camera 13, and is not limited here. The conveying mechanism 12 stops moving within the preset duration, keeping the electrode assembly 20 stationary and reducing the likelihood of blurring of the first image due to vibration or inertia. After the preset duration has elapsed, the conveying mechanism 12 continues to move along the running direction X.

[0076] The drive assembly is used to provide a driving force to the first vision camera 13 in the running direction X of the conveyor mechanism 12. The drive assembly may be, but is not limited to, a servo motor coupled with a lead screw (not shown in the figure), a cylinder (not shown in the figure), or a gear and rack mechanism (not shown in the figure), etc.

[0077] During movement, the first-view camera 13 acquires a complete outline image of the tab 202 of the electrode assembly 20 through continuous exposure of the line scan camera or multi-frame shooting of the area scan camera.

[0078] When the electrode assembly 20 is transported to the vision inspection station 192 by the conveyor mechanism 12 and paused, the drive component drives the first vision camera 13 to perform a scanning motion along the running direction X, in order to continuously acquire the first image of the tab 202. The above scanning motion can be, but is not limited to, unidirectional scanning, reciprocating scanning, etc., and is not limited here.

[0079] By pausing the conveyor mechanism 12 at the visual inspection station 192 for a preset time, the drive component drives the first visual camera 13 to move along the X-direction, allowing the first visual camera 13 to capture the complete contour of the tab 202. This reduces the imaging field of view under a fixed angle, thereby achieving full-range and high-precision measurement of the misalignment of the tab 202 and solving the problem of limited imaging field of view for the stationary first visual camera 13. Furthermore, the stationary conveyor mechanism 12 and the moving first visual camera 13 not only make the electrode assembly 20 more stable, thus improving the stability of image acquisition, but also expand the detection range through the scanning motion of the first visual camera 13, which is beneficial for providing a foundation for higher-quality image data later.

[0080] In some embodiments, the conveying mechanism 12 includes a conveyor belt 121, a drive roller (not shown in the figure), and an encoder (not shown in the figure). The conveyor belt 121 is fitted onto the drive roller. The encoder is disposed on the drive roller. The drive roller drives the conveyor belt 121 to move. The encoder moves synchronously with the drive roller to detect the rotation angle of the drive roller in real time and determine the position of the electrode assembly 20 on the conveyor belt 121. In response to the electrode assembly 20 being transported to the vision inspection station 192 by the conveyor belt 121, the encoder sends a trigger signal to the first vision camera 13 to start the first vision camera 13 to acquire a first image of the tab 202.

[0081] The conveying mechanism 12 smoothly transports the electrode assembly 20 unloaded at the unloading station 191 to the vision inspection station 192. The conveyor belt 121 of the conveying mechanism 12 carries and transports the electrode assembly 20. The drive roller is the power source for the conveying mechanism 12, and can be driven by a servo motor (not shown in the figure) or a stepper motor (not shown in the figure). The conveyor belt 121 is fitted onto the drive roller, and moves with the drive roller through friction or toothed engagement. The servo motor or stepper motor drives the drive roller, which in turn drives the conveyor belt 121 in a cyclical motion.

[0082] The encoder can be mounted or coupled to the shaft end of the drive roller, and the encoder and drive roller rotate coaxially and synchronously. The encoder is used to acquire the rotation angle or pulse count of the drive roller in real time and calculate the moving position of the electrode assembly 20 on the conveyor belt 121. Since there is no relative slippage or the slippage is minimal between the drive roller and the conveyor belt 121, based on the known linear velocity of the conveyor belt 121 or the circumference of the drive roller, the encoder can accurately calculate the current real-time position coordinates of the electrode assembly 20 on the conveyor belt 121 according to the acquired rotation angle or pulse count of the drive roller. The encoder described above is a conventional component and is not limited here.

[0083] When the encoder calculation results show that the electrode assembly 20 has reached the vision inspection station 192, the encoder sends a trigger signal to the first vision camera 13, so that the first vision camera 13 can capture the first image of the tab 202.

[0084] By fitting the limited conveyor belt 121 onto the drive roller, the encoder moves synchronously with the drive roller and detects the rotation angle in real time. When the electrode assembly 20 accurately reaches the vision inspection station 192, the first vision camera 13 is triggered to capture the first image of the electrode tab 202, thereby improving the accuracy of image acquisition timing and reducing the risk of missed or false detections due to inaccurate positioning.

[0085] The encoder detects the rotation angle of the drive roller in real time, analyzes and calculates the rotation angle, and determines the position of the electrode assembly 20 on the conveyor belt 121. The encoder sends a trigger signal to the first vision camera 13 to start the first vision camera 13 to acquire the first image of the tab 202.

[0086] In other embodiments, the encoder detects the rotation angle or pulse count of the drive roller in real time and transmits the rotation angle or pulse count to the controller. The controller analyzes the position of the electrode assembly 20 on the conveyor belt 121 based on the rotation angle or pulse count. When the electrode assembly 20 on the conveyor belt 121 is conveyed to the vision inspection station 192, the controller sends a trigger signal to the first vision camera 13 to start the first vision camera 13 to acquire a first image of the tab 202.

[0087] In some embodiments, the first visual camera 13 includes a line scan camera or an area scan camera. The line scan camera or the area scan camera acquires a first image of the tab 202.

[0088] The line scan camera is an image acquisition device whose image sensor (not shown in the figure) consists of multiple rows of pixels, capable of scanning and stitching images line by line. Line scan cameras are characterized by high resolution and an infinitely long imaging field of view. The line scan camera is used to acquire the first image of the tab 202. The aforementioned line scan camera is a conventional component and is not limited here.

[0089] An area scan camera can capture a complete two-dimensional planar image in a single exposure. It can also directly output a complete rectangular two-dimensional image. The area scan camera described above is a standard component and is not further specified here.

[0090] By defining the first visual camera 13 as a linear scan camera, the linear scan camera has the characteristics of ultra-high horizontal resolution, infinite vertical imaging field of view, and uniform horizontal pixel density. Alternatively, the first visual camera 13 may include an area scan camera, which can output a complete rectangular two-dimensional image and has the characteristics of uniform imaging and minimal distortion.

[0091] Please see Figure 9 , Figure 9 This is a partial side view of the first embodiment of the winding device of this application. (In conjunction with...) Figures 1 to 8 This application provides a winding apparatus. The winding apparatus 100 is used to manufacture electrode assemblies 20. The winding apparatus 100 includes a turret 11 and a tab detection device 10. The turret 11 moves to a feeding station 191. The conveying mechanism 12 in the tab detection device 10 is used to carry the electrode assembly 20 at the feeding station 191.

[0092] The tab detection device 10 can be applied to the winding equipment 100. The winding equipment 100 is an automated device used in battery production to continuously stack and wind positive electrode sheets (not shown in the figure), separators (not shown in the figure), and negative electrode sheets (not shown in the figure) in a predetermined order, tension, and process parameters. The winding equipment 100 is used to manufacture electrode assemblies 20.

[0093] The turret 11 of the winding equipment 100 is a disc-shaped component. The turret 11 can rotate. The turret 11 moves intermittently with the turret drive mechanism (not shown in the figure). When the turret 11 moves to the unloading station 191, the electrode assembly 20 on the turret 11 moves to the unloading station 191 and waits for unloading.

[0094] The battery cell body 201 is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator. During the movement of the conveying mechanism 12, it passes through the unloading station 191 and the vision inspection station 192 in sequence.

[0095] During the operation of the winding equipment 100, the electrode assembly 20 is unloaded from the unloading station 191 of the turret 11 and placed on the conveying mechanism 12. The conveying mechanism 12 transports the electrode assembly 20 to the vision inspection station 192, where the first vision camera 13 is triggered and captures the first image of the tab 202.

[0096] The winding equipment 100, through the combined action of the turret 11 and the tab detection device 10, can acquire a first image with independent edge contours of multiple tabs 2021, thereby reducing the problem of visual blind spots caused by the overlap of multiple tabs 2021, thus providing an image data basis for subsequent misalignment analysis.

[0097] In some embodiments, the winding device 100 includes an industrial computer (not shown) and a controller (not shown). The industrial computer is connected to a first vision camera 13 and is used to calculate a first misalignment amount based on a first image. The industrial computer is also connected to the controller and is used to feed back the first misalignment amount to the controller. The controller is used to control the operation of the winding device 100 according to the first misalignment amount.

[0098] The industrial control computer is used to receive the first image captured by the first vision camera 13. The industrial control computer processes the first image using an image processing algorithm and calculates the first misalignment. The first misalignment includes the misalignment of the tab 202 and the misalignment direction of the tab 202, etc.

[0099] The industrial control computer feeds back the first misalignment amount to the controller. The controller controls the operation of the winding equipment 100 based on the first misalignment amount. For example, the controller controls parameters such as the diameter change of the main winding needle 111, the winding tension, and the running speed to meet the misalignment requirements of the tab 202 and the misalignment requirements of different types of tabs 202. It should be noted that the functions implemented between the industrial control computer and the controller can be achieved through existing application programs, which will not be elaborated here.

[0100] Through the combined action of the industrial computer, controller, and first vision camera 13, the misalignment of the tab 202 can be controlled in real time.

[0101] Please see Figure 10 , Figure 10 This is the first image schematic diagram of this application. Combined with... Figures 1 to 9 The following will detail the method and steps for obtaining the first misalignment amount from the first image.

[0102] First, the first image is preprocessed. The first image acquired by the first vision camera 13 is transmitted to the controller. Based on the first image, the controller sequentially performs preprocessing such as grayscale conversion, ROI (Region of Interest) cropping, filtering and noise reduction, and contrast enhancement to eliminate reflections, dust, noise, etc.

[0103] Secondly, edge detection methods, such as the Sobel gradient algorithm or the Canny algorithm, are used to extract the complete edges of the outer contour of the electrode assembly 20.

[0104] Then, feature extraction methods, such as contour extraction, contour filtering, and line fitting, are used to extract the outermost point of one corner of electrode assembly 20 as xL and the outermost point of the other corner of electrode assembly 20 as xR. Substituting these into Xcenter=(xL+xR) / 2, the baseline centerline is obtained.

[0105] The offset pixel of the positive electrode head tab relative to the center line is X1, and the offset pixel of the positive electrode tail tab relative to the center line is Xn. The offset pixel of the negative electrode head tab relative to the center line is Y1, and the offset pixel of the negative electrode tail tab relative to the center line is Yn. That is, X1 to Xn and Y1 to Yn are the pixel offsets of different tabs relative to the center line.

[0106] Independent tab contours are selected from the complete contour image; the tab side lines are fitted using least squares / caliper fitting, and the abscissas A1, An, C1, and Cn of each tab layer are extracted. X1 = A1 - Xcenter; Xn = An - Xcenter; Y1 = C1 - Xcenter; Yn = Cn - Xcenter. The pixel misalignment of the first and last tabs is calculated: Xn′ = Xn - X1; Yn′ = Y1 - Yn. The actual positive tab misalignment is ΔX = Xn′ * K; the actual negative tab misalignment is ΔY = Yn′ * K. K is a calibration coefficient used for unit conversion. Through the above formulas, the pixel-level misalignment of the image is converted into the micrometer-level real misalignment required by the process.

[0107] Specifically, Xn′ = Xn - X1. If Xn > X1 and Xn′ > 0, the tail pole positive electrode ear is deflected to the left. If Xn < X1 and Xn′ < 0, the tail pole positive electrode ear is deflected to the right. Negative electrode ear: Yn′ = Y1 - Yn. If Yn > Y1 and Yn′ > 0, the tail pole negative electrode ear is deflected to the left. If Yn < Y1 and Yn′ < 0, the tail pole negative electrode ear is deflected to the right.

[0108] In the first image described above, both tabs 202 are located on the same cell body 201. In other embodiments, when the tabs 202 are located on different sides of the cell body 201, the tab detection device 10 includes two first vision cameras 13. The two first vision cameras 13 respectively acquire first images corresponding to different tabs 202. The tab offset method in the two first images can refer to the steps described above, and will not be repeated here.

[0109] In some embodiments, the controller is configured to: issue a first warning via an alarm unit (not shown in the figure) in response to a first misalignment amount being greater than a first threshold and less than or equal to a second threshold; and control a diameter adjustment assembly (not shown in the figure) to adjust the diameter of the main winding needle 111 on the turret 11 in response to a first misalignment amount being greater than the second threshold, and issue a second warning via the alarm unit.

[0110] The first threshold and the second threshold are preset values ​​used to classify the first misalignment amount, and the first threshold is less than the second threshold.

[0111] The alarm unit may include an audible and visual alarm (not shown in the diagram), a human-machine interface (HMI) prompt module (not shown in the diagram), or indicator lights (not shown in the diagram), etc., to issue warning signals to operators or the system. The first warning corresponds to a minor misalignment. The second warning corresponds to a severe misalignment. When the first misalignment is greater than a first threshold and less than or equal to a second threshold, it indicates that the first misalignment is within an acceptable but concerning range. At this time, the controller activates the alarm unit to issue the first warning, alerting the operator, but without interfering with the operation of the winding equipment 100 to ensure production continuity. For example, the first warning may be displayed as a yellow warning message on the HMI or illuminated as a yellow warning light.

[0112] When the first misalignment exceeds the second threshold, it indicates that the first misalignment has exceeded the allowable range and may affect the quality of the electrode assembly 20. At this time, in addition to controlling the alarm unit to issue a second warning, the controller also controls the diameter adjustment assembly to adjust the diameter of the main winding needle 111.

[0113] Specifically, the main winding needle 111 includes two half-winding needles (not shown in the figure) and a diameter adjustment assembly. The diameter adjustment assembly includes a servo drive unit (not shown in the figure), a wedge block (not shown in the figure), and a spring return assembly (not shown in the figure). The servo drive unit linearly pushes the wedge block to move axially, using the inclined surface of the wedge block to open or close the two half-winding needles, thereby changing the gap between the two half-winding needles, thus realizing the change of the outer diameter of the main winding needle 111 to adapt to different battery cell winding and tab misalignment compensation requirements.

[0114] If the servo drive unit pushes the wedge block forward, the inclined plane compresses the two halves of the coiled needle outward, increasing the gap between them and increasing the outer diameter of the main coiled needle 111. If the servo drive unit pulls the wedge block backward, the spring reset assembly pulls the two halves of the coiled needle inward, decreasing the gap between them and reducing the outer diameter of the main coiled needle 111. The main coiled needle 111 described above has a conventional structure and will not be elaborated further. Figure 10 As shown, when the diameter of the main winding needle 111 increases, the electrode plate in the tail direction of the electrode assembly 20 extends to the left, and the electrode tab also moves to the left. When the diameter of the main winding needle 111 decreases, the electrode plate in the tail direction of the electrode assembly 20 extends further to the right, and the electrode tab also moves to the right.

[0115] The second warning could be a red alarm message displayed on the human-machine interface or a red warning light illuminated, possibly accompanied by an audible alarm. It should be noted that the functions implemented between the controller, alarm unit, and diameter adjustment component can be achieved through existing applications, which will not be elaborated upon here.

[0116] By setting a first threshold and a second threshold to classify the first misalignment amount, the winding equipment 100 can take corresponding measures under different misalignment levels, reduce frequent shutdowns for adjustment due to minor misalignment, and thus improve production efficiency and equipment utilization.

[0117] The magnitudes of the first and second thresholds mentioned above are related to the specifications of different electrode components 20. The first and second thresholds can be statistically derived based on historical misalignment data of qualified products (e.g., the 3σ principle). When the tab misalignment specification is ±γ mm, the target center value μ is 0 mm, and CPK ≥ 1.67, the threshold setting should be less than or equal to σ. Specifically, when γ is 8, σ ≤ 1.60 mm. In other embodiments, γ can also be other values, which are not limited here.

[0118] The comparison between the first misalignment amount and the first threshold can be between the current negative electrode tail tab misalignment amount of the electrode assembly and the negative electrode tail tab misalignment amount of historical qualified products, or between the current positive electrode tail tab misalignment amount of the electrode assembly and the positive electrode tail tab misalignment amount of historical qualified products, or between the average positive and negative electrode tail tab values ​​of the current electrode assembly and the average positive and negative electrode tail tab values ​​of historical qualified products, etc., and is not limited here.

[0119] Continue reading Figures 1 to 9 In some embodiments, the winding apparatus 100 further includes a feeding mechanism (not shown in the figure), a pre-compression mechanism 15, a transfer mechanism (not shown in the figure), and a second vision camera (not shown in the figure). The feeding mechanism is used to transfer the electrode assembly 20 on the turret 11 to the pre-compression mechanism 15. The pre-compression mechanism 15 is used to pre-compress the electrode assembly 20. The transfer mechanism is used to transfer the pre-compressed electrode assembly 20 to the conveying mechanism 12. The second vision camera (not shown in the figure) is used to acquire a second image (not shown in the figure) of the tab portion 202 of the electrode assembly 20 during the pre-compression process.

[0120] The unloading mechanism is located downstream of the unloading station and is used to transfer the electrode assembly 20 on the turret 11 to the pre-pressing mechanism 15. The unloading mechanism can be used for unloading by grippers, robotic arms, etc.

[0121] The pre-compression mechanism 15 is located near the unloading mechanism and is used to receive the electrode assembly 20 transferred by the unloading mechanism and pre-compress the electrode assembly 20. The pre-compression mechanism 15 may include a pre-compression drive (not shown in the figure) and a pressure plate (not shown in the figure) connected to the pre-compression drive.

[0122] The transfer mechanism is located between the pre-compression mechanism 15 and the conveying mechanism 12, and is used to transfer the pre-compression shaped electrode assembly 20 from the pre-compression station to the conveyor belt 121 of the conveying mechanism 12. The transfer mechanism can be used for transfer by gripper type, robotic arm transfer, vacuum suction cup transfer, etc.

[0123] The second vision camera is a device that uses optical imaging principles to control light and record images. The second vision camera is positioned near the pre-pressing mechanism 15 and is used to acquire a second image of the tab 202 during the pre-pressing process. The second vision camera can be an area scan camera or a line scan camera. The second image may include the outline of the tab 202 on one or the other side of the cell body 201, the spacing between the tabs 202, and the independent edge features of the multiple layers of tabs 2021.

[0124] By limiting the use of a second vision camera to acquire a second image of the tab 202 of the electrode assembly 20 during the pre-pressing process, it is possible not only to acquire the influence of the pre-pressing action on the position of the tab 202 and obtain misalignment data that is closer to the final shape of the electrode assembly 20, but also to acquire a second image with independent edge contours of multiple tabs 2021, thereby reducing the problem of visual blind spots caused by the overlap of multiple tabs 2021, thus providing an image data basis for subsequent misalignment analysis.

[0125] In other embodiments, a second vision camera may be disposed on the side of the conveying mechanism 12 along the second direction Y or above the conveying mechanism 12, for acquiring a second image of the tab 202 after pre-pressing and shaping and transfer to the conveying mechanism 12. Through the above limitations, not only can misalignment data closer to the final shape of the electrode assembly 20 be obtained, but the electrode assembly 20 on the conveying mechanism 12 is also more stable, thereby improving the image quality of the second image.

[0126] In one specific embodiment, the pre-pressing mechanism 15 includes a pre-pressing table (not shown in the figure). A feeding mechanism is used to transfer the electrode assembly 20 onto the pre-pressing table. When two tabs 202 are simultaneously provided on one side of the cell body 201, and both tabs 202 face the side of the pre-pressing table, the second vision camera can be located at the side of the pre-pressing table. Alternatively, when one tab 202 is provided on one side of the cell body 201, a second vision camera is located on the side of one tab 202 away from the cell body 201 and on one side of the pre-pressing table; another tab 202 is provided on the other side of the cell body 201, and another second vision camera is located on the other side of the other tab 202 away from the cell body 201 and on the other side of the pre-pressing table.

[0127] See Figure 11 and Figure 12 , Figure 11 This is a partial side view of the second embodiment of the winding device of this application; Figure 12 This is a partial side view of a third embodiment of the winding apparatus of this application. (In conjunction with...) Figures 1 to 9In some embodiments, the turret 11 is provided with a master winding needle 111. The master winding needle 111 rotates with the turret 11. The winding apparatus 100 also includes a third vision camera 14 and a controller. The third vision camera 14 is used to acquire a third image (not shown in the figure) of the tab 202 of the electrode sheet before entering the master winding needle 111 and / or a fourth image (not shown in the figure) of the tab 202 of the electrode sheet during the winding process on the master winding needle 111. The controller is connected to the third vision camera 14 and is used to acquire the third image and / or the fourth image and calculate a second misalignment amount, and calculate the diameter change amount of the next master winding needle 111 based on the second misalignment amount.

[0128] The turret disc 11 rotates intermittently with the turret drive mechanism (not shown in the figure), and the main winding needle 111 rotates with the turret disc 11. The main winding needle 111 passes sequentially through the winding station (not shown in the figure), the adhesive application station (not shown in the figure), the unloading station 191, and the winding station. The main winding needle 111 is used to wind the electrode sheet and the diaphragm to obtain the electrode assembly 20.

[0129] Specifically, the turret 11 may include a winding station, an adhesive application station, and a unloading station 191. When the main winding needle 111 is located at the winding station, it can wind the positive electrode sheet, the negative electrode sheet, and the separator to obtain the electrode assembly 20. As the turret 11 rotates, the main winding needle 111 rotates with the turret 11 to the adhesive application station, where it can apply adhesive to the electrode assembly 20. As the turret 11 continues to rotate, the main winding needle 111 rotates with the turret 11 to the unloading station 191, awaiting unloading.

[0130] like Figure 11 As shown, the third vision camera 14 can be located before the electrode enters the main winding needle 111. The third vision camera 14 acquires a third image of the tab 202. The third image includes the position of the tab 2021 of the electrode, the spacing of the tabs 2021, etc.

[0131] And / or, such as Figure 12 As shown, the third vision camera 14 can be located at the winding station of the turret 11. The third vision camera 14 acquires a fourth image of the tab portion 202. The fourth image includes the outline of the tab portion 202 on one side of the cell body 201 and the independent edge features of the multi-layer tabs, etc. Figure 11 and Figure 12 The difference lies in the different locations of the third vision camera 14.

[0132] The number of the aforementioned third vision cameras 14 can be one or two. When there is one third vision camera 14, it can be located before the electrode enters the main winding needle 111; or, it can be located at the winding station of the turret 11. When there are two third vision cameras 14, one can be located before the electrode enters the main winding needle 111, and the other can be located at the winding station of the turret 11.

[0133] The third-vision camera 14 is a device that uses optical imaging principles to control light and record images. The third-vision camera is used to acquire a third or fourth image from the tab 202. The aforementioned third-vision camera 14 can be a line scan camera or an area scan camera, etc.

[0134] In other embodiments, the winding apparatus 100 further includes a sensor (not shown in the figure). The sensor acquires the position of the tabs 2021 and the spacing between the tabs 2021. The sensor may be, but is not limited to, a fiber optic photoelectric sensor (not shown in the figure), a laser edge sensor (not shown in the figure), etc.

[0135] The controller calculates a second misalignment based on a third and / or fourth image. The second misalignment includes the misalignment of the tab 202 and its misalignment direction. The controller can calculate the second misalignment in real time, such as updating the calculation every turn of winding, to ensure data real-time performance. The method by which the controller calculates the second misalignment based on the third and / or fourth image can be the same as or similar to the method described above for calculating the first misalignment based on the first image, and will not be elaborated further here.

[0136] The controller calculates the diameter change of the next main winding needle 111 based on the second misalignment amount, compensates the next main winding needle 111, and thus improves the stability of each winding turn.

[0137] The following are the detailed steps for calculating the diameter of the next main winding needle 111 using the second misalignment amount: (1) The third and / or fourth images are transmitted to the controller. The controller uses the compensation algorithm to calculate the diameter compensation increment, where the compensation algorithm can be a linear relationship between the electrode misalignment and the diameter ratio compensation coefficient. (2) The upper and lower limits are executed to obtain the effective adjustment amount. (3) The wedge block displacement is calculated using the wedge block inclined plane geometric formula. If the electrode of the previous roll is deflected to the right, the distance between the two half-winding needles is increased; if the electrode of the previous roll is deflected to the left, the distance between the two half-winding needles is decreased. (4) The displacement is converted into a servo pulse to complete the pre-adjustment of the winding diameter before the next electrode assembly 20 starts winding. After winding is completed, the misalignment is detected again, and the compensation amount of the next roll is calculated iteratively to form a closed-loop self-correction. For example, if the tabs of the previous roll are 50 micrometers to the right, the controller calculates that the next roll of needles needs to be spread open by 10 micrometers. This is then converted into a servo pushing the wedge block forward a certain distance, and the two half-needles are spread open simultaneously. When each layer of the next roll is wound, the rightward deviation trend is offset in advance, the tab misalignment of each turn is reduced, and the winding is more stable.

[0138] Continue reading Figures 1 to 12 In a specific application scenario, the winding device 100 includes a turret 11, a conveying mechanism 12, and a first vision camera 13. The main winding needle 111 rotates with the turret 11 and moves to the unloading station 191. The conveying mechanism 12 passes through the unloading station 191 and the vision inspection station 192. The conveying mechanism 12 includes a bearing surface 1211. The bearing surface 1211 intersects the vertical direction Z. Along the second direction Y, the first vision camera 13 is disposed on one side of the conveying mechanism 12, and the orthographic projection of the first vision camera 13 onto the tab 202 at least partially overlaps with the tab 202. The second direction Y is parallel to the bearing surface 1211 and perpendicular to the running direction X of the conveying mechanism 12. When the conveying mechanism 12 transports the electrode assembly 20 to the vision inspection station 192, the first vision camera 13 is used to acquire a first image of the tab 202.

[0139] In other embodiments, the tab detection device 10 can be applied to a stacking machine (not shown in the figure). The stacking machine first die-cuts the positive and negative electrode sheets into independent small pieces, and then folds them repeatedly using a robotic arm or a Z-shaped diaphragm, stacking them alternately in a positive-diaphragm-negative-diaphragm pattern to form a flat stacked battery cell. By applying the tab detection device 10 to the stacking machine, a first image with independent edge contours of multiple layers of tabs 2021 can be acquired, thereby reducing the visual blind spot caused by the overlap of multiple layers of tabs 2021, thus providing an image data basis for subsequent misalignment analysis.

[0140] The method steps for obtaining the first misalignment amount of the tab 202 from the first image in the stacking machine are similar to those for obtaining the first misalignment amount of the tab 202 from the first image in the winding equipment 100, and will not be repeated here.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A tab detection device, wherein the electrode assembly includes a cell body and a tab portion, the tab portion extending from the cell body along a first direction, characterized in that, The electrode detection device includes: A conveying mechanism with a visual inspection station; the conveying mechanism is used to carry the electrode assembly and transport the electrode assembly to the visual inspection station. A first vision camera is disposed at the vision inspection station. When the conveying mechanism transports the electrode assembly to the vision inspection station, the first vision camera is located on the side of the electrode tab away from the battery cell body. The electrode tab is located within the imaging field of view of the first vision camera, and the first vision camera is used to acquire a first image of the electrode tab. Along the first direction, the orthographic projection of the first visual camera onto the electrode tab overlaps at least partially with the electrode tab.

2. The electrode detection device according to claim 1, characterized in that, The battery cell body has a first tab and a second tab on one side; along the first direction, the orthographic projection of the first vision camera onto the first tab and the second tab is located at the middle position between the first tab and the second tab.

3. The electrode detection device according to claim 1, characterized in that, A first tab is provided on one side of the battery cell body along a first direction, and a second tab is provided on the other side of the battery cell body along the first direction; the tab detection device includes two first vision cameras, one of which is located on the side of the first tab away from the battery cell body; along the first direction, the orthographic projection of the first vision camera on the first tab at least partially overlaps with the first tab; the other first vision camera is located on the other side of the second tab away from the battery cell body; along the first direction, the orthographic projection of the other first vision camera on the second tab at least partially overlaps with the second tab.

4. The electrode detection device according to claim 1, characterized in that, The first vision camera includes an image sensor, the imaging surface of which is parallel to one side of the battery cell body.

5. The electrode detection device according to claim 1, characterized in that, The conveying mechanism includes a bearing surface that intersects a vertical direction; along a second direction, a first vision camera is disposed on one side of the conveying mechanism; wherein, the second direction is parallel to the bearing surface and perpendicular to the operating direction of the conveying mechanism, and the second direction is parallel to the first direction.

6. The electrode detection device according to claim 1, characterized in that, The first vision camera is used to acquire the first image during the movement of the conveying mechanism relative to the first vision camera.

7. The electrode detection device according to claim 1, characterized in that, The conveying mechanism is configured to transport the electrode assembly to the visual inspection station, pause for a preset time, and then transport the electrode assembly away from the visual inspection station. The electrode detection device includes a driving component connected to the first vision camera, which drives the first vision camera to move along the running direction of the conveying mechanism, so that the first vision camera acquires the first image during the movement.

8. The electrode detection device according to claim 1, characterized in that, The conveying mechanism includes a conveyor belt, a drive roller, and an encoder. The conveyor belt is sleeved on the drive roller, and the encoder is disposed on the drive roller. The drive roller drives the conveyor belt to move, and the encoder moves synchronously with the drive roller to detect the rotation angle of the drive roller in real time and determine the position of the electrode assembly on the conveyor belt. In response to the electrode assembly being transported to the vision inspection station by the conveyor belt, the encoder sends a trigger signal to the first vision camera to start the first vision camera to acquire a first image of the electrode tab.

9. The electrode detection device according to any one of claims 1 to 8, characterized in that, The first visual camera includes a line scan camera or an area scan camera, which acquires the first image.

10. A winding apparatus for fabricating electrode assemblies, characterized in that, The winding equipment includes: The turret moves to the unloading station; The electrode detection device according to any one of claims 1 to 9, wherein the conveying mechanism in the electrode detection device is used to carry the electrode assembly of the unloading station.

11. The winding apparatus according to claim 10, characterized in that, The winding equipment further includes an industrial computer and a controller. The industrial computer is connected to the first vision camera and is used to calculate a first misalignment amount based on the first image. The industrial computer is also connected to the controller and is used to feed back the first misalignment amount to the controller. The controller is used to control the operation of the winding equipment according to the first misalignment amount.

12. The winding apparatus according to claim 11, characterized in that, The controller is used for, In response to the first misalignment being greater than the first threshold and less than or equal to the second threshold, a first warning is issued through the alarm unit; In response to the first misalignment being greater than the second threshold, the diameter adjustment component is controlled to adjust the diameter of the main winding needle on the turret, and a second warning is issued through the alarm unit.

13. The winding apparatus according to claim 10, characterized in that, The winding equipment further includes a feeding mechanism, a pre-compression mechanism, a transfer mechanism, and a second vision camera; the feeding mechanism is used to transfer the electrode assembly on the turret to the pre-compression mechanism; the pre-compression mechanism is used to pre-compress the electrode assembly; the transfer mechanism is used to transfer the pre-compressed electrode assembly to the conveying mechanism; the second vision camera is used to acquire a second image of the tab of the electrode assembly during the pre-compression process.

14. The winding apparatus according to claim 10, characterized in that, The turret is equipped with a main winding needle, which rotates with the turret. The winding device also includes a third vision camera and a controller. The third vision camera is used to capture a third image of the tab of the electrode sheet before it enters the main winding needle and / or a fourth image of the tab of the electrode sheet during the winding process on the main winding needle. The controller is connected to the third vision camera and is used to acquire the third image and / or the fourth image and calculate the second misalignment amount, and calculate the next main needle diameter change amount based on the second misalignment amount.

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