Tab folding detection system

Abstract

The utility model relates to the technical field of battery production, and discloses a tab folding detection system, which is characterized in that two groups of machine vision modules are arranged to respectively and correspondingly detect tabs on two sides of a pole piece, and each group of machine vision module comprises a first image acquisition module and a second image acquisition module; the first image acquisition module acquires the image of the tab on the pole piece before winding, and the second image acquisition module acquires the image of the tab on the pole piece wound on the winding needle, so that the turnover defect of the tab on the pole piece in the winding process can be accurately detected in real time; according to the invention, a scientific basis is provided for timely adjustment and optimization of a production line, so that the production efficiency is improved, the cost and time of manual detection are reduced, and more importantly, the quality control level of battery products is greatly improved, and the safety of the products is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery production technical field especially relates to a pole lug turns over detection system. BACKGROUND

[0002] In the production process of battery cell, a key step is involved, that is, the unwinding and cutting of the pole piece. After this process is completed, the two sides of the pole piece belt will naturally form a pole lug structure with a specific function. These pole lugs, as key components for current transmission inside the battery, have the characteristics of being significantly protruding from the edge of the pole piece belt, discontinuous and spaced distribution, and their thickness is precisely controlled within a very thin range. However, it is precisely due to its unique physical form and weak structural characteristics that during the subsequent transmission of the pole piece belt through the roller and the final winding process, the pole lug is extremely susceptible to mechanical stress and prone to folding.

[0003] The folding of the pole lug not only seriously damages the stability and efficiency of the electrical connection inside the battery, but also can directly lead to a decline in battery performance, and even worse, can cause short circuits, overheating and other safety risks, posing a major threat to the overall quality and safety performance of the product.

[0004] Therefore, how to efficiently and accurately identify and detect this potential problem, i.e., the folding of the pole lug, has become an indispensable part of ensuring the safety performance and excellent quality of battery products, and is also one of the technical challenges and problems faced by the current battery manufacturing industry.

[0005] The above information is given as background information only to assist in understanding the present disclosure, and does not determine or acknowledge whether any of the above content can be used as prior art with respect to the present disclosure. UTILITY MODEL CONTENT

[0006] The utility model provides a kind of pole lug folding detection system to solve the problems in prior art.

[0007] To achieve the above purpose, the utility model provides the following technical scheme:

[0008] A kind of pole lug folding detection system is used to detect the folding defects of the pole lug on the pole piece in the winding process, including two groups of machine vision modules, one group of machine vision modules corresponds to the pole lug on one side of the pole piece, and another group of machine vision modules corresponds to the pole lug on the other side of the pole piece;

[0009] Each group of machine vision modules includes a first image acquisition module and a second image acquisition module;

[0010] The first image acquisition module is used to acquire the image of the pole lug on the pole piece before winding;

[0011] The second image acquisition module is configured to acquire an image of the tab on the pole piece wound on the winding needle.

[0012] Further, in the tab folding detection system, the first image acquisition module comprises a plane array camera, a fixed-focus lens and a linear light source.

[0013] The fixed-focus lens is connected with the plane array camera.

[0014] The plane array camera and the linear light source are respectively directed to the surface of one side of the pole piece before winding.

[0015] Further, in the tab folding detection system, the fixed-focus lens is a liquid lens.

[0016] Further, in the tab folding detection system, the distance between the fixed-focus lens and the pole piece before winding is 293mm±20mm.

[0017] Further, in the tab folding detection system, the distance between the linear light source and the pole piece before winding is 140mm±20mm.

[0018] Further, in the tab folding detection system, the second image acquisition module comprises a linear array camera, a line-scan lens and an arc-shaped light source.

[0019] The line-scan lens is connected with the linear array camera.

[0020] The linear array camera and the arc-shaped light source are respectively directed to the surface of one side of the pole piece wound on the winding needle.

[0021] Further, in the tab folding detection system, the line-scan lens is a liquid lens.

[0022] Further, in the tab folding detection system, the distance between the line-scan lens and the pole piece wound on the winding needle is 286mm±20mm.

[0023] Further, in the tab folding detection system, the distance between the arc-shaped light source and the pole piece wound on the winding needle is 50mm±20mm.

[0024] Further, the tab folding detection system further comprises an image processor.

[0025] The image processor is in communication connection with the machine vision module, and is configured to identify whether there is a tab folding defect according to the image acquired by the machine vision module.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] The utility model provides a kind of tab fold detection system, two groups of machine vision module are set respectively corresponding to the tab of the pole piece of both sides, and each group of machine vision module includes first image acquisition module and second image acquisition module, the image of the tab on the pole piece before winding is collected by first image acquisition module, the image of the tab on the pole piece wound to the reel needle is collected by second image acquisition module, so that the real-time accurate detection of the folding defect of the tab on the pole piece in winding process can be realized, scientific basis is provided for the timely adjustment and optimization of production line, so as to not only improve production efficiency, reduce the cost and time of artificial detection, more importantly, it greatly improves the quality control level of battery product, ensures the safety of product.

[0028] The utility model has other characteristics and advantages, which will be obvious from the drawings incorporated herein and the subsequent specific embodiments or will be described in detail in the drawings incorporated herein and the subsequent specific embodiments, which are used together to explain the specific principles of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.

[0030] Fig. 1 It is the structure (side view) schematic diagram of a kind of tab fold detection system provided by the utility model embodiment;

[0031] Fig. 2 It is the structure (top view) schematic diagram of a kind of tab fold detection system provided by the utility model embodiment.

[0032] Reference signs:

[0033] First image acquisition module 1, second image acquisition module 2;

[0034] Area array camera 11, fixed focus lens 12, linear light source 13;

[0035] Linear array camera 21, line scanning lens 22, arcuate light source 23. DETAILED DESCRIPTION

[0036] To explain possible application scenarios, technical principles, specific implementation schemes, and the purposes and effects of the present application in detail, the following embodiments are described in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] In this paper, the term "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing at various places in the specification does not necessarily refer to the same embodiment, and does not particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, each technical feature mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0038] Unless otherwise defined, the meaning of the technical terms used herein is the same as that generally understood by those skilled in the art to which the present application belongs; the use of related terms herein is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0039] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this paper generally represents that the associated objects before and after are a "or" logical relationship.

[0040] In the present application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0041] Without more limitations, in the present application, the phrases "include", "contain", "have" or other similar expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0042] In the present application, "greater than", "less than", "exceed" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly specified.

[0043] In the description of the embodiments of the present application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawing, and are only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and do not indicate or imply that the indicated device or component must have a particular position, a particular orientation, or be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0044] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", and the like should be understood broadly. For example, the "connection" can be fixed connection, or detachable connection, or integrated setting; it can be mechanical connection, or electrical connection, or communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] Embodiment one

[0046] In view of the defects of the prior art, the present applicant, based on many years of rich practical experience and professional knowledge in designing and manufacturing in this field, and with the application of theory, actively researches and innovates, in the hope of creating a technology that can solve the defects in the prior art. After continuous research, design, and repeated trial of samples and improvement, the present utility model is finally created, which has practical value.

[0047] Please refer to Figs. 1-2 The embodiment of the present utility model provides a tab folding detection system for detecting tab folding defects on a tab in a winding process through highly automated and intelligent means, ensuring quality control of the tab in the winding process. The design integrates advanced machine vision technology, realizing omnidirectional and high-precision monitoring of tab folding defects.

[0048] The system comprises two groups of machine vision modules, one group of the machine vision modules corresponding to the detection of the tab on one side of the pole piece, and the other group of the machine vision modules corresponding to the detection of the tab on the other side of the pole piece, so as to realize independent and synchronous detection of the tabs on both sides of the pole piece. This kind of double-sided parallel detection strategy significantly enhances the comprehensiveness and accuracy of detection.

[0049] Each group of the machine vision modules comprises a first image acquisition module 1 and a second image acquisition module 2.

[0050] The first image acquisition module 1 is carefully arranged at the front end of the winding process and is used for acquiring the image of the tab on the pole piece before winding. This step is crucial, which provides a flawless reference for the subsequent detection process.

[0051] The second image acquisition module 2 is located behind the key node of the winding process and is used for acquiring the image of the tab on the pole piece wound on the winding needle. By comparing the differences in the tab shape at the two time points, the system can accurately identify any tab folding defects caused by the winding process.

[0052] It should be noted that the embodiments of the utility model not only realize real-time and accurate detection of tab folding defects, but also provide strong data support for dynamic adjustment and optimization of the production line. This not only greatly improves the operation efficiency of the production line and effectively reduces the high cost and long time caused by traditional manual detection, but more importantly, it fundamentally improves the overall quality control level of the battery product, ensures that each product leaving the factory can meet the highest safety requirements, and sets a new quality benchmark for the industry.

[0053] Please refer to Figs. 1-2 In one embodiment of the embodiment, the composition of the first image acquisition module 1 is described in detail. As a key component of the detection system, the module undertakes the important task of capturing the initial state image of the tab on one side of the pole piece before winding.

[0054] Specifically, the first image acquisition module 1 carefully integrates three core elements, namely, a planar array camera 11, a fixed-focus lens 12 and a linear light source 13. The planar array camera 11, as the core equipment of image acquisition, has high resolution and fast imaging capability, and can clearly capture the subtle features and morphological changes on the surface of the tab. The fixed-focus lens 12 is closely connected with the planar array camera 11, and through its precise focal length adjustment and optical performance, it ensures that the camera can capture clear and distortion-free images.

[0055] In addition, to further enhance the quality and stability of image acquisition, the embodiment also introduces a linear light source 13 as an auxiliary lighting device. The linear light source 13 is ingeniously arranged beside the area array camera 11, with its light direction precisely towards the side surface of the pre-winding pole piece, effectively eliminating the image shadow or reflection problems that may be caused by insufficient or uneven distribution of environmental light. Through the uniform illumination of the linear light source 13, the details of the pole ear are more clearly displayed, providing more reliable raw data for subsequent image processing and defect identification.

[0056] In one embodiment of the present embodiment, the fixed focus lens 12 is further upgraded, adopting advanced liquid lens technology. As an innovative optical element, the unique working principle of liquid lens lies in the use of the deformability of liquid to adjust the focal length.

[0057] Compared with traditional mechanical fixed focus lenses, liquid lenses have higher flexibility and response speed. They can quickly adjust the focal length according to detection needs, ensuring clear and stable images at different working distances and angles. This feature is particularly important for the pole ear folding detection system, as the position and posture of the pole piece may change due to various factors during actual production, which requires the detection system to quickly adapt to these changes to ensure the accuracy of the detection results.

[0058] In addition, liquid lenses have the advantages of small size, light weight, and low power consumption, making them more suitable for integration into compact and efficient machine vision modules. In the present embodiment, the application of liquid lenses not only improves the performance of the first image acquisition module 1, but also makes it possible to design a more compact and flexible detection system.

[0059] In one embodiment of the present embodiment, the precise distance range of the fixed focus lens 12 and the linear light source 13 relative to the pre-winding pole piece is specified in detail to ensure the accuracy and stability of image acquisition.

[0060] First, regarding the distance between the fixed focus lens 12 and the pre-winding pole piece, it is set to 293mm±20mm. This distance range is chosen based on a comprehensive consideration of multiple factors, including the focal length characteristics of the lens, the size and shape of the pole piece, and the layout of other equipment on the production line. By maintaining an appropriate distance between the lens and the pole piece, it can ensure that the lens can capture a large and clear image area, while avoiding image distortion or blur problems caused by too close or too far distance.

[0061] Secondly, the distance between the linear light source 13 and the tab before winding is set to 140mm±20mm. This distance range is also set to optimize the lighting effect, to ensure that the tab surface can be evenly and adequately illuminated, thereby further improving the quality of image acquisition. The precise arrangement of the linear light source not only helps to eliminate shadows and reflections, but also highlights the detailed features of the tab, providing more favorable conditions for subsequent image processing and defect identification.

[0062] It should be noted that the above distance range is not absolutely fixed, but is flexibly adjusted according to specific application scenarios and detection requirements. In actual application, these parameters may need to be further optimized through experiments and debugging to achieve the best detection effect.

[0063] Please refer again to Figs. 1-2 In one embodiment of the present embodiment, the composition of the second image acquisition module 2 is described in detail. This module focuses on capturing the tab image of the tab wound to one side of the winding needle, to realize the detection of the folding defects that may occur during winding.

[0064] Specifically, the second image acquisition module 2 integrates three key components: a linear array camera 21, a line scan lens 22, and an arch-shaped light source 23. The linear array camera 21, as a special image acquisition device, has a sensor composed of a linear array of multiple light-sensitive elements, and is particularly suitable for high-speed, high-precision image scanning of continuous motion or long strip-shaped objects. In the present embodiment, the linear array camera 21 is used to capture dynamic images of the tab wound on the winding needle.

[0065] The linear array camera 21 is closely matched with the line scan lens 22. The line scan lens 22 has a special optical design that can provide clear imaging in the scanning direction of the linear array camera 21. By connecting the line scan lens 22 with the linear array camera 21, it can be ensured that the camera can capture stable and clear tab images during high-speed winding of the tab.

[0066] In addition, in order to improve the quality of image acquisition, the present embodiment also introduces an arch-shaped light source 23 as an illumination device. The arch-shaped light source 23 is inspired by its shape similar to the profile of the tab wound on the winding needle, which can ensure that light can uniformly illuminate the entire surface of the tab, especially the tab area. This uniform illumination helps to eliminate shadows and reflections, making the detailed features of the tab more clearly displayed.

[0067] In terms of layout, the linear array camera 21 and the arch-shaped light source 23 are respectively directed towards the surface of the tab wound to one side of the winding needle. This layout ensures that the camera can directly capture the actual state of the tab, while the arch-shaped light source provides the necessary lighting support, making the entire image acquisition process more efficient and accurate.

[0068] In one embodiment of the present embodiment, the technical content of the second image acquisition module 2 is further improved, mainly by upgrading the line scan lens 22 to a liquid lens. As mentioned above, the liquid lens, as an advanced optical element, has the unique feature of utilizing the deformability of liquid to achieve focal length and optical path adjustment. Compared with traditional mechanical lenses, liquid lenses have higher flexibility and response speed, and can adapt to different detection environments and conditions more quickly. This feature is particularly important for the second image acquisition module 2, because the pole piece wound on the winding needle is a dynamic process, and the position and posture of the pole lug can change at any time. The application of liquid lens enables the line scan lens 22 to quickly adjust the focal length and optical path, ensuring that clear and stable pole lug images can always be captured.

[0069] In addition, the liquid lens also has the advantages of small volume, light weight and low power consumption, which makes it more suitable for integration into compact and efficient machine vision systems. In the present embodiment, the application of liquid lens not only improves the performance of the second image acquisition module 2, but also provides the possibility for the design of a more compact and flexible detection system.

[0070] In one embodiment of the present embodiment, the precise distance range of the line scan lens 22 and the arc-shaped light source 23 relative to the pole piece wound on the winding needle is specified in detail to ensure the accuracy and stability of image acquisition.

[0071] First, regarding the distance between the line scan lens 22 and the pole piece wound on the winding needle, it is set to 286mm±20mm. This distance range is chosen based on a comprehensive consideration of lens focal length, pole piece size, winding process, and the layout of other equipment on the production line, etc. Maintaining an appropriate distance between the lens and the pole piece can ensure that the lens can capture a large and clear image area, while avoiding image distortion caused by too close distance or image blur caused by too far distance.

[0072] Second, the distance between the arc-shaped light source 23 and the pole piece wound on the winding needle is set to 50mm±20mm. This relatively close distance setting is to ensure that the arc-shaped light source can closely match the profile of the pole piece, providing uniform and sufficient illumination. The design of the arc-shaped light source enables its light to be distributed along the surface of the pole piece, effectively eliminating shadows and reflections, and highlighting the detailed features of the pole lug. By precisely controlling the distance between the light source and the pole piece, the lighting effect can be further optimized, and the quality of image acquisition can be improved.

[0073] It should be noted that the above distance range is not absolutely fixed, but can be flexibly adjusted according to specific application scenarios and detection requirements. In actual application, these parameters may need to be further optimized through trial and debugging to achieve the best detection effect.

[0074] In one embodiment of the present embodiment, an image processor is introduced as the core processing unit of the tab folding detection system. This design enables the entire system not only to efficiently collect images, but also to intelligently analyze and process the collected images, thereby accurately identifying tab folding defects.

[0075] The image processor is communicatively connected with the machine vision module (including the first image collection module and the second image collection module). This means that when the machine vision module completes image collection, it will immediately transmit image data to the image processor for subsequent processing.

[0076] The image processor internally integrates advanced image processing algorithms and defect recognition technologies. These algorithms and technologies can automatically pre-process images (such as noise reduction, contrast enhancement, etc.), and then extract key features (such as tab contours, shapes, positions, etc.) from the images. By comparing and analyzing with the pre-set normal tab morphology and folding defect feature library, the image processor can accurately determine whether the current tab has a folding defect. Once a tab folding defect is detected, the image processor will immediately trigger an alarm mechanism to send a warning signal to the operator. At the same time, it can also record and store the detection results and related information (such as defect location, size, type, etc.) for subsequent analysis and traceability.

[0077] In summary, the introduction of the image processor greatly improves the intelligent level and detection efficiency of the tab folding detection system. It enables the system to automatically complete image collection, processing and analysis, achieving rapid and accurate identification of tab folding defects, and providing strong technical support for quality control in the battery production process.

[0078] Although the terms first image collection module, second image collection module, etc. are used more frequently in this application, the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present utility model; any additional limitation on their interpretation is contrary to the spirit of the present utility model.

[0079] The utility model provides a kind of tab fold detection system, by setting two groups of machine vision module respectively corresponding the tab of the detection tab piece both sides, and each group of machine vision module includes first image acquisition module and second image acquisition module, the image of the tab on the tab piece before entering roll is collected by first image acquisition module, the image of the tab on the tab piece that is wound to roll needle is collected by second image acquisition module, so that the real-time accurate detection of the fold defect of the tab on the tab piece in winding process can be realized, scientific basis is provided for the timely adjustment and optimization of production line, thereby not only improve production efficiency, reduce the cost and time of artificial detection, more importantly, it greatly improves the quality control level of battery product, ensures the safety of product.

[0080] Finally, it needs to be explained that, although the above-mentioned embodiments have been described in the specification and drawings of the present application, the patent protection scope of the present application should not be limited. Any technical solution obtained by replacing or modifying the equivalent structure or equivalent process based on the essential concept of the present application, using the content described in the specification and drawings of the present application, or directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc. are all included in the patent protection scope of the present application.

Claims

1. A tab folding detection system for detecting tab folding defects on a pole piece during winding, characterized in that: It includes two sets of machine vision modules, one set of machine vision modules corresponds to detecting the tabs on one side of the electrode piece, and the other set of machine vision modules corresponds to detecting the tabs on the other side of the electrode piece; Each group of the machine vision modules comprises a first image acquisition module (1) and a second image acquisition module (2); The first image acquisition module (1) is used to acquire an image of the pole lug on the pole piece before winding; The second image acquisition module (2) is used to acquire an image of the pole lug on the pole piece wound onto the winding needle.

2. The tab folding detection system according to claim 1, characterized in that: The first image acquisition module (1) comprises an area array camera (11), a fixed-focus lens (12) and a linear light source (13); The fixed-focus lens (12) is connected to the area array camera (11); The area array camera (11) and the linear light source (13) are respectively directed toward the surface of one side of the pole piece before winding.

3. The tab folding detection system according to claim 2, characterized in that: The fixed-focus lens (12) is a liquid lens.

4. The tab folding detection system according to claim 2, characterized in that: The distance between the fixed-focus lens (12) and the pole piece before winding is 293 mm ± 20 mm.

5. The tab folding detection system according to claim 2, characterized in that: The distance between the linear light source (13) and the pole piece before winding is 140 mm ± 20 mm.

6. The tab folding detection system according to claim 1, characterized in that: The second image acquisition module (2) comprises a line array camera (21), a line scanning lens (22) and an arch light source (23); The line scan lens (22) is connected to the line array camera (21); The linear array camera (21) and the arched light source (23) are respectively oriented toward the surface of one side of the pole piece wound onto the winding needle.

7. The tab folding detection system according to claim 6, characterized in that: The line scanning lens (22) is a liquid lens.

8. The tab folding detection system according to claim 6, characterized in that: The distance between the line scanning lens (22) and the pole piece wound onto the winding needle is 286 mm ± 20 mm.

9. The tab folding detection system according to claim 6, characterized in that: The distance between the arched light source (23) and the pole piece wound onto the winding needle is 50 mm ± 20 mm.

10. The tab folding detection system according to claim 1, characterized in that: Also includes image processor; The image processor is communicatively connected to the machine vision module and is used to identify whether there is a tab folding defect based on an image captured by the machine vision module.

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