Foil extension device and pole piece production line
By combining a vision inspection system with a tension drive mechanism, the tension of the foil is automatically controlled, which solves the problem of wrinkles in the uncoated areas of the foil and improves the efficiency and quality of electrode production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-04-07
AI Technical Summary
In existing technologies, wrinkles are easily generated in the uncoated areas of the foil during the rolling process. It is difficult to accurately control the tension manually, resulting in unstable electrode production quality and problems such as tape breakage or wrinkles that cannot be completely eliminated.
A visual inspection system is used to identify wrinkled areas in the foil. The tension drive mechanism is controlled by grayscale value detection and processing equipment to achieve automated real-time control of the foil tension, ensuring that the grayscale value is within the preset range and eliminating wrinkles.
It improves the accuracy of the foil stretching process, reduces human error, enhances the efficiency and quality of electrode production, and ensures the flatness of the foil and product consistency.
Smart Images
Figure CN224087744U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of electrode production technology, specifically relating to foil stretching equipment and electrode production lines. Background Technology
[0002] Battery electrodes are typically made by coating active materials onto foil. In electrode manufacturing, the rolling process is a crucial step, requiring the coating material on the foil to be pressed to the designed compaction density. During this process, the coated area of the foil is compressed and stretched, while the uncoated area (i.e., the bare foil area) is thinner than the coated area and is not compressed, resulting in severe wrinkles. To effectively stretch the uncoated area, current technology generally involves manually adjusting the tension of a tension roller on the uncoated area of the foil to ensure sufficient stretching and eliminate wrinkles. However, manual tension adjustment is prone to significant errors. Excessive tension can easily cause electrode breakage, while insufficient tension fails to effectively eliminate wrinkles, thus failing to meet the high-quality production requirements of electrodes. Utility Model Content
[0003] In view of at least one of the above-mentioned defects or deficiencies in the prior art, this application provides a foil stretching device and an electrode production line, which can precisely adjust the tension according to the degree of wrinkling of the foil, realize the automated real-time control of tension adjustment, and improve the efficiency and product quality of electrode production.
[0004] To achieve the above objectives, this application provides a foil stretching apparatus, comprising:
[0005] Tension rolls are used to be arranged parallel to and spaced apart from calender rolls;
[0006] A vision inspection system is used to detect the grayscale value of the foil located between the calendering roll and the tension roll;
[0007] A tension drive mechanism for driving the tension roller to tension the foil located between the calendering roller and the tension roller; and
[0008] The processing device communicates with the vision inspection system and the tension drive mechanism respectively, and is configured to control the tension drive mechanism to drive the tension roller to tension the foil when the gray value is greater than or less than a preset gray value range, until the gray value is within the preset gray value range.
[0009] In some embodiments, the foil stretching device further includes a flattening roller disposed between the tension roller and the calendering roller, and the vision inspection system is used to detect the grayscale value of the foil on the flattening roller.
[0010] In some embodiments, the foil stretching device further includes a positioning rod extending along the length of the flattening roller, and the vision inspection system includes an industrial camera and a camera mount, the industrial camera being mounted on the camera mount and the camera mount being movably mounted on the positioning rod.
[0011] In some embodiments, multiple industrial cameras and camera supports are provided, with multiple camera supports being sequentially and spaced apart on the positioning rod along the length direction of the flattening roller, and multiple industrial cameras being respectively mounted on the camera supports.
[0012] In some embodiments, the visual inspection system further includes an adjustable illumination lamp, which is mounted on the camera mount via a connecting arm.
[0013] In some embodiments, at least two fill lights are provided, with the two fill lights respectively located on both sides of the industrial camera.
[0014] In some embodiments, the tension drive mechanism includes a linear telescopic assembly and a swing rod connected to the tension roller. The linear telescopic assembly drives the swing rod to swing, thereby causing the tension roller to press the foil.
[0015] In some embodiments, the linear telescopic component is a hydraulic cylinder, a pneumatic cylinder, or an electric actuator.
[0016] In some embodiments, the tension roller is configured as a conveyor roller, and the tension drive mechanism is configured as a rotary drive mechanism for driving the tension roller to rotate at a variable speed.
[0017] A second aspect of this application provides an electrode production line, which includes the foil stretching device described above.
[0018] The foil stretching device of this application uses visual inspection technology to visually inspect the foil, which can accurately identify the wrinkled areas of the foil. By acquiring the grayscale value of the wrinkled area, the degree of wrinkling of the foil can be quantified. Then, the grayscale value information measured by the visual inspection system is acquired by the processing equipment, and the tension drive mechanism is controlled to apply appropriate tension to the foil based on the grayscale value information, so that the wrinkled areas of the foil are effectively stretched and extended. This realizes the automated real-time control of tension regulation, which makes the tension adjustment more accurate and the wrinkle removal effect of the foil better. It avoids the error problems caused by manual tension adjustment. When applied to the electrode production line, it can significantly improve the efficiency of electrode production and product quality.
[0019] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description
[0020] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:
[0021] Figure 1 This is a schematic diagram of a foil stretching device according to a specific embodiment of this application;
[0022] Figure 2 for Figure 1 A partial schematic diagram of a foil stretching device;
[0023] Figure 3 This is a schematic diagram of a foil material in the prior art.
[0024] Explanation of reference numerals in the attached figures
[0025] 1. Tension roll 2. Calendering roll
[0026] 3 Flattening rollers 4 Positioning rods
[0027] 5 Industrial camera 6 Camera mount
[0028] 7. Fill light 8. Connecting arm
[0029] 9 Adjusting block 10 Linear telescopic assembly
[0030] 11. Swing rod 12. Conveyor roller
[0031] 13 Pinch Rollers Detailed Implementation
[0032] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.
[0033] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.
[0034] like Figure 1As shown, a first exemplary embodiment of this application provides a foil stretching device, which includes a tension roller 1, a vision inspection system, a tension driving mechanism, and a processing device. The tension roller 1 is arranged parallel to and spaced apart from the calendering roller 2, and can serve as a conveyor roller for feeding the rolled foil. The vision inspection system detects the grayscale value of the foil located between the calendering roller 2 and the tension roller 1, for example, by acquiring an image of the foil, analyzing the image, obtaining wrinkled areas, and calculating the grayscale value of the wrinkled areas. The tension driving mechanism drives the tension roller 1 to tension the foil located between the calendering roller 2 and the tension roller 1. The processing device communicates with both the vision inspection system and the tension driving mechanism, and is configured to control the tension driving mechanism to drive the tension roller 1 to tension the foil when the grayscale value is greater than or less than a preset grayscale range, until the grayscale value falls within the preset grayscale range.
[0035] Therefore, the foil stretching device of this exemplary embodiment employs visual inspection technology to visually inspect the foil, thereby accurately identifying wrinkled areas and quantifying the degree of wrinkling by acquiring the grayscale values of the wrinkled areas. Compared to manually identifying the degree of wrinkling, using a visual inspection system for identification and analysis improves the accuracy of wrinkle detection. Crucially, the visual inspection system communicates with the tension drive mechanism through processing equipment. When it detects a deviation between the real-time detected grayscale value and a preset grayscale range, it controls the tension drive mechanism to output a corresponding driving force, thereby driving the tension roller 1 to tension the foil with a corresponding force. This ensures the foil is subjected to appropriate tension, effectively stretching and extending it to eliminate wrinkles. The foil stretching device of this exemplary embodiment has a high degree of automation throughout the tension control process, enabling real-time detection and tension adjustment of the rolled foil. Furthermore, the tension adjustment is highly accurate, resulting in better wrinkle removal and avoiding errors caused by manual tension control. When applied to electrode production lines, it can significantly improve the efficiency and product quality of electrode production.
[0036] It should be noted that the steps or algorithms required for real-time detection of foil materials by the visual inspection system of this embodiment are well known to those skilled in the art and are not part of the core improvement of this application, therefore they will not be described in detail here. The aforementioned grayscale value can be the average grayscale value of the wrinkled area. When the average grayscale value deviates from the preset grayscale range, it means that the degree of wrinkling is high and does not meet production requirements. The processing equipment can preset the correspondence between the grayscale deviation value and the tension to be applied, and the tension can be precisely controlled according to this correspondence.
[0037] In addition, after tension adjustment, when the gray value of the foil measured by the vision inspection system returns to the preset gray value range, the tension drive mechanism can be controlled to drive the tension roller 1 to return to the initial state, reduce the tension on the foil, and avoid excessive stretching and damage to the part of the foil that has not wrinkled.
[0038] In an optional or preferred embodiment, the processing device may be a programmable logic controller.
[0039] In an optional or preferred embodiment, the foil stretching device further includes a flattening roller 3 disposed between the tension roller 1 and the calendering roller 2. The flattening roller 3 serves to flatten the foil and also provides directional transport of the foil. Flattened foil better reflects its actual state, effectively eliminating wrinkles caused by uneven flattening. Therefore, using a vision inspection system to perform grayscale detection on the flattened foil further improves the accuracy of the grayscale detection results, thereby improving the accuracy of tension adjustment.
[0040] Understandably, the vision inspection system includes an industrial camera 5 for acquiring images of the foil. To achieve the installation of the industrial camera 5, such as... Figure 2 As shown, in one embodiment, the vision inspection system further includes a camera mount 6 for mounting the industrial camera 5. To enable the industrial camera 5 to be movable and adjustable, allowing it to acquire images of the foil at different positions in the width direction according to actual inspection needs, the foil stretching device also includes a positioning rod 4 extending along the length of the flattening roller 3. The camera mount 6 is movably mounted on the positioning rod 4. For example, the camera mount 6 and the positioning rod 4 form a sliding fit connection; alternatively, the positioning rod 4 is formed as a lead screw, and the camera mount 6 forms a lead screw-nut fit with the positioning rod 4 via a nut. This application does not limit the movable connection method between the camera mount 6 and the positioning rod 4.
[0041] Therefore, when the position of the industrial camera 5 needs to be adjusted, simply drive the camera support 6 to move on the positioning rod 4 to determine the position of the industrial camera 5 in the length direction of the flattening roller 3, thereby acquiring images of different positions of the foil on the flattening roller 3, which also helps to improve the flexibility of the device.
[0042] To achieve multi-faceted synchronous detection, such as Figure 2 As shown, multiple industrial cameras 5 and camera supports 6 are provided. Multiple camera supports 6 are sequentially and spaced apart on the positioning rod 4 along the length of the flattening roller 3, and multiple industrial cameras 5 are respectively mounted on the camera supports 6. Therefore, multiple industrial cameras 5 can simultaneously acquire images of different positions on the foil material on the flattening roller 3, and according to actual testing requirements, each industrial camera 5 can be moved on the positioning rod 4 via its respective camera support 6 to adjust its relative position. For example, for... Figure 3The foil material used for electrode production shown has a coated area in the middle and empty foil areas on both sides. At this time, two industrial cameras 5 can be set accordingly. The two industrial cameras 5 are distributed at the two ends of the positioning rod 4 to acquire images of the two empty foil areas of the foil material, so as to facilitate wrinkle detection and wrinkle removal operations in the two empty foil areas.
[0043] In an optional or preferred embodiment, such as Figure 2 As shown, the visual inspection system also includes an adjustable illumination lamp 7, which is mounted on the camera mount 6 via a connecting arm 8. The illumination lamp 7 includes a lamp body and an adjustment block 9. The adjustment block 9 can swing relative to the connecting arm 8. The lamp body is connected to the connecting arm 8 via the adjustment block 9, allowing the illumination angle to be adjusted by swinging the adjustment block 9. Under the illumination of the illumination lamp 7, the highlights and shadows of the foil wrinkled areas can be enhanced, making it easier for the visual inspection system to measure the grayscale value of the wrinkled areas.
[0044] Furthermore, at least two supplementary lights 7 are provided, with the two supplementary lights 7 respectively positioned on both sides of the industrial camera 5. Under the illumination of two or more supplementary lights 7, the industrial camera 5 can obtain clearer images with higher contrast, further improving the accuracy of foil wrinkle detection.
[0045] In an optional or preferred embodiment, such as Figure 1 As shown, the tension drive mechanism includes a linear telescopic assembly 10 and a swing rod 11. The swing rod 11 is connected to the tension roller 1. The linear telescopic assembly 10 drives the swing rod 11 to swing, thereby causing the tension roller 1 to press the foil. Specifically, both the linear telescopic assembly 10 and the swing rod 11 can be mounted on a bracket. The swing rod 11 is hinged to the bracket. The linear telescopic assembly 10 can provide bidirectional pushing or pulling power to the swing rod 11, while the swing rod 11 can convert the linear telescopic assembly 10's linear motion into the swing of the tension roller 1. When the tension roller 1 swings to further increase the curvature of the foil, the length of the foil's conveying path increases accordingly, thereby further tensioning the foil and achieving the effect of stretching and wrinkle removal.
[0046] In this embodiment, the linear telescopic component 10 can be a hydraulic cylinder, a pneumatic cylinder, or an electric push rod, etc., and this application does not limit it. Taking a pneumatic cylinder as an example, the pneumatic circuit of a pneumatic cylinder is usually equipped with a solenoid valve, a pressure reducing valve, and a speed regulating valve, etc., wherein, by controlling the magnitude of the energizing current of the solenoid valve, the extension length of the cylinder can be controlled, thereby controlling the swing amplitude of the tension roller 1, and ultimately achieving the purpose of controlling the tension of the foil. The specific working principle of the linear telescopic component 10 is well known to those skilled in the art and is not part of the core improvement of this application, so it will not be described in detail here.
[0047] In another embodiment, the tension roller 1 is formed as a conveyor roller 12, and the tension drive mechanism is formed as a rotary drive mechanism (not shown in the figures) for driving the tension roller 1 to rotate at a variable speed. Thus, when it is necessary to increase the tension of the foil between the calendering roller 2 and the tension roller 1, the rotational speed of the rotary drive mechanism can be increased, thereby increasing the rotational speed of the tension roller 1 and thus increasing the tension of the foil; when it is necessary to decrease the tension of the foil between the calendering roller 2 and the tension roller 1, the rotational speed of the rotary drive mechanism can be decreased, thereby decreasing the rotational speed of the tension roller 1 and thus increasing the reduction of the foil tension. Figure 1 In the embodiment shown, the clamping roller 13 can be configured to work in conjunction with the conveying roller 12 to clamp the foil. As the conveying roller 12 rotates, the clamping roller 13 can rotate synchronously with it, thereby stably feeding out the foil.
[0048] A second exemplary embodiment of this application provides an electrode production line that includes the foil stretching device described above. Clearly, the electrode production line of this exemplary embodiment possesses all the technical effects brought about by the foil stretching device described above, and therefore will not be repeated here.
[0049] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between components; 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0052] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A foil stretching device, characterized in that, include: Tension roll (1) is arranged parallel to and spaced apart from calender roll (2); A visual inspection system is used to detect the grayscale value of the foil located between the calendering roll (2) and the tension roll (1); A tension drive mechanism is used to drive the tension roller (1) to tension the foil located between the calendering roller (2) and the tension roller (1); as well as The processing device communicates with the vision inspection system and the tension drive mechanism respectively, and is configured to control the tension drive mechanism to drive the tension roller (1) to tension the foil when the gray value is greater than or less than a preset gray value range, until the gray value is within the preset gray value range.
2. The foil stretching device according to claim 1, characterized in that, The foil stretching device also includes a flattening roller (3) disposed between the tension roller (1) and the calendering roller (2), and the vision inspection system is used to detect the gray value of the foil on the flattening roller (3).
3. The foil stretching device according to claim 2, characterized in that, The foil stretching device also includes a positioning rod (4) extending along the length of the flattening roller (3). The vision inspection system includes an industrial camera (5) and a camera support (6). The industrial camera (5) is mounted on the camera support (6), and the camera support (6) is movably mounted on the positioning rod (4).
4. The foil stretching device according to claim 3, characterized in that, Multiple industrial cameras (5) and multiple camera supports (6) are provided. Multiple camera supports (6) are arranged sequentially and spaced apart on the positioning rod (4) along the length direction of the flattening roller (3). Multiple industrial cameras (5) are respectively arranged on the camera supports (6).
5. The foil stretching device according to claim 3, characterized in that, The visual inspection system also includes an adjustable illumination lamp (7), which is mounted on the camera mount (6) via a connecting arm (8).
6. The foil stretching apparatus according to claim 5, characterized in that, At least two fill lights (7) are provided, and the two fill lights (7) are respectively arranged on both sides of the industrial camera (5).
7. The foil stretching apparatus according to claim 1, characterized in that, The tension drive mechanism includes a linear telescopic component (10) and a swing rod (11). The swing rod (11) is connected to the tension roller (1). The linear telescopic component (10) drives the swing rod (11) to swing so as to drive the tension roller (1) to press the foil.
8. The foil stretching apparatus according to claim 7, characterized in that, The linear telescopic component (10) is a hydraulic cylinder, a pneumatic cylinder, or an electric push rod.
9. The foil stretching device according to claim 1, characterized in that, The tension roller (1) is formed as a conveyor roller (12), and the tension drive mechanism is formed as a rotary drive mechanism for driving the tension roller (1) to rotate at a variable speed.
10. An electrode production line, characterized in that, The electrode production line includes a foil stretching device according to any one of claims 1 to 9.