Lithium battery surface defect detection device

Abstract

The utility model discloses a lithium battery surface defect detection device, and belongs to the technical field of lithium battery detection. In order to solve the problems in the prior art that the lithium battery surface defect detection device is complicated in mounting structure and low in detection efficiency due to limitation of the light position and the mounting angle of a CCD (Charge Coupled Device) when a pole piece is shot by a camera, light-emitting components are arranged on a first passing roller and a second passing roller, the first passing roller is arranged on one side surface of the pole piece, and the second passing roller is arranged on the other side surface of the pole piece; the first passing roller is arranged on one side face of the pole piece, the second passing roller is arranged on the other side face of the pole piece, the first camera is arranged on one side face of the pole piece, the second camera is arranged on the other side face of the pole piece, and the first passing roller and the second passing roller are fixedly installed between the first camera and the second camera. The problem of limitation of the position and the installation angle of the CCD light can be solved without additionally providing the CCD light, and the lithium battery surface defect detection efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery detection, and more specifically, to a lithium battery surface defect detection device. Background Art

[0002] With recent advances in battery technology, the application areas of lithium-ion batteries have continued to expand, and they are gradually replacing other large-capacity batteries. These batteries are increasingly found in small and portable electronic devices, medical and military electronics, large industrial equipment such as electric vehicles and even small electric aircraft, and even renewable energy. Lithium-ion battery pole pieces are crucial components in batteries, and their quality has a crucial impact on battery performance.

[0003] Lithium-ion batteries are primarily composed of a positive electrode, a negative electrode, a separator, and an electrolyte. During the charge and discharge process, lithium ions (Li+) are intercalated and deintercalated between the positive and negative electrodes in a rocking-chair-like manner. The coating on a lithium-ion battery electrode can be considered a composite material, consisting primarily of three components: active material particles, a carbon paste phase (a mixture of a conductive agent and a binder), and electrolyte to fill the pores. Surface defects such as bumps / agglomerates, chipping / pinholes, dark spots, bright spots, and metallic foreign matter on the positive and negative electrode surfaces can negatively impact the battery's capacity, electrical performance, and safety.

[0004] In the preparation process of positive and negative electrodes of lithium batteries, more online defect detection technologies are being adopted, which can easily identify defects that cannot be seen by the human eye, thereby effectively identifying defects in the electrode process, eliminating defective products, and reducing the defective rate. However, both existing coating equipment and roller pressing equipment have more rollers, occupying more space, and the installation structure is complex, resulting in limitations in the storage location of CCD lights. In addition, since the installation of CCD lights requires a special angle to capture the surface defects of lithium batteries, the installation of CCD lights is not arbitrary. Finally, the existing lithium battery surface defect detection device takes a long time to debug in the early stage of the changeover, resulting in low detection efficiency.

[0005] A search revealed a Chinese patent application, application number 201310614804.6, published on November 12, 2014, which discloses a device for detecting surface defects in lithium battery pole pieces. The device comprises a pole piece conveying device and a visual inspection device. The pole piece conveying device comprises a front conveying device and a rear conveying device operating in the same direction. A detection table is provided between the front conveying device and the rear conveying device, and a light-transmitting structure is provided on the detection table. The visual inspection device comprises an upper surface inspection device disposed above the detection table and a lower surface inspection device disposed below the light-transmitting slit. The upper and lower surface inspection devices can simultaneously inspect the upper and lower surfaces of the lithium battery pole piece. However, this solution employs a separate light-transmitting structure on the detection table, resulting in a complex structural arrangement and low efficiency in detecting surface defects in lithium batteries using the light-transmitting structure. Utility Model Content

[0006] 1. Technical problems to be solved by the utility model

[0007] In order to solve the problem in the prior art that the position and installation angle of the CCD light are limited when the electrode is photographed by a camera, resulting in a complex installation structure and low detection efficiency of the lithium battery surface defect detection device, the utility model provides a lithium battery surface defect detection device, in which a light-emitting component is arranged on the roller. When the electrode is conveyed on the roller, the light-emitting component on the roller provides a light source for the camera to photograph the two sides of the electrode. There is no need to provide additional CCD light, which can solve the problem of the limitation of the CCD light position and installation angle, and significantly improve the efficiency of lithium battery surface defect detection.

[0008] 2. Technical solution

[0009] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is:

[0010] A lithium battery surface defect detection device includes a photographing device and a conveying device, the photographing device includes a first camera and a second camera, the conveying device includes a first roller and a second roller, the first roller and the second roller are provided with light-emitting components, the first roller is arranged on one side of the pole piece, and the second roller is arranged on the other side of the pole piece; the first camera is arranged on one side of the pole piece, the second camera is arranged on the other side of the pole piece, and the first roller and the second roller are fixedly arranged between the first camera and the second camera.

[0011] When photographing the surface defects of the electrode piece through the first camera and the second camera, the first roller and the second roller are fixedly arranged between the first camera and the second camera. When the electrode piece is conveyed on the first roller and the second roller, the first roller and the second roller bend the electrode piece. At the same time, the light-emitting components arranged on the first roller and the second roller can also provide light sources for the first camera and the second camera to photograph the surface of the electrode piece, so that the first camera and the second camera can clearly photograph the surface image of the electrode piece, thereby judging whether there are defects on the surface of the electrode piece through the surface image of the electrode piece. Therefore, without occupying additional space, the problem of CCD light position and installation angle limitations can be solved, and the efficiency of lithium battery surface defect detection can be effectively improved.

[0012] Furthermore, the light-emitting component includes a light-emitting layer wrapped around the first and second roller surfaces. The light-emitting layer is composed of a light-emitting material and is wrapped around the first and second roller surfaces to achieve a light-emitting effect, thereby providing light source for the first and second cameras to photograph the electrode surface.

[0013] Furthermore, a cavity is defined in the middle of the first and second rollers, and the light-emitting component is disposed within the cavity. A light-transmitting structure is also provided on the first and second rollers. By arranging the light-emitting component within the cavities of the first and second rollers, the light from the light-emitting component is emitted through the light-transmitting structure on the first and second rollers, providing light for the first and second cameras to capture the electrode surface. This solves the limitations of CCD light position and mounting angle without occupying additional space, effectively improving the efficiency of lithium battery surface defect detection.

[0014] Furthermore, a protective layer is wrapped on the light-transmitting structure to protect the light-emitting component and prevent the light-emitting component from being damaged.

[0015] Furthermore, the first and second rollers are arranged in parallel, and the plane formed by the first and second rollers is inclined relative to the horizontal plane. Furthermore, when the plane formed by the first and second rollers is arranged at an inclined angle relative to the horizontal plane, after the first and second cameras have fixed shooting angles, the first and second cameras can obtain a wider shooting angle, thereby fully and clearly capturing an image of the pole piece surface.

[0016] Furthermore, the imaging device further includes a first guide rail and a second guide rail, the first camera being mounted on the first guide rail, and the second camera being mounted on the second guide rail. By mounting the first camera and the second camera on the first guide rail and the second guide rail, respectively, the first camera and the second camera can find the optimal angle to capture images of the electrode surface. This simplifies the structure, saves space, and enables effective inspection of the lithium battery surface, ensuring product quality.

[0017] Furthermore, the first guide rail includes a first support frame, a first slider, a first linear guide rail and a second linear guide rail, the first slider is movably mounted on the first support frame, one side of the first slider is connected to the first linear guide rail, the other side of the first slider is connected to the second linear guide rail, and the first camera is fixedly mounted on the first slider; the second guide rail includes a second support frame, a second slider, a third linear guide rail and a fourth linear guide rail, the second slider is movably mounted on the second support frame, one side of the second slider is connected to the third linear guide rail, the other side of the second slider is connected to the fourth linear guide rail, and the second camera is fixedly mounted on the second slider.

[0018] The first camera and the second camera are fixedly mounted on the first slider and the second slider respectively. The first camera and the second camera can respectively find the optimal shooting angle as the first slider and the second slider move, and then fix the positions of the first camera and the second camera to shoot the surface image of the pole piece; in addition, the first linear guide and the second linear guide provide support for the first support frame and the first slider to prevent the first slider from falling off, and the third linear guide and the fourth linear guide provide support for the second support frame and the second slider to prevent the second slider from falling off.

[0019] 3. Beneficial effects

[0020] Compared with the existing known technologies, the technical solution provided by the present invention has the following beneficial effects:

[0021] (1) The present invention provides a lithium battery surface defect detection device. When a first camera and a second camera are used to photograph the surface defects of a pole piece, a light-emitting component is arranged on the first roller and the second roller. The light-emitting component provides a light source for the first camera and the second camera, so that the first camera and the second camera can clearly photograph the surface image of the pole piece, thereby judging whether there are defects on the surface of the pole piece through the surface image of the pole piece, thereby achieving a lithium battery surface defect detection device with a simple structure and convenient installation, and effectively improving the efficiency of lithium battery surface defect detection.

[0022] (2) The present invention provides a lithium battery surface defect detection device, in which the surface of the first roller and the surface of the second roller are wrapped with a luminescent layer, which is composed of a luminescent material, and can provide light sources for the first camera and the second camera in a simple and efficient manner. The device has a simple structure and does not require additional space, thereby solving the problem of CCD light position and installation angle limitations.

[0023] (3) The present invention provides a lithium battery surface defect detection device, which sets a light-emitting component in the cavity of the first roller and the second roller. The light source of the light-emitting component is emitted through the light-transmitting structure to provide light source for the first camera and the second camera. It does not need to occupy additional space, and can solve the problem of CCD light position and installation angle limitations. It has a simple structure and effectively improves the efficiency of lithium battery surface defect detection.

[0024] (4) The present invention provides a lithium battery surface defect detection device, in which the first roller and the second roller are arranged in parallel, and the plane formed by the first roller and the second roller is inclined relative to the horizontal plane. After the first camera and the second camera fix the shooting angle, the first camera and the second camera can fully and clearly capture the surface image of the electrode, thereby achieving effective detection of the lithium battery surface and ensuring product quality.

[0025] (5) The present invention provides a lithium battery surface defect detection device, which sets the first roller and the second roller at a fixed position, so that the first roller and the second roller can be directly installed before the electrode enters the site, and there is no need to change the position later, which effectively reduces the debugging time of the lithium battery surface defect detection device and saves labor costs and time costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a lithium battery surface defect detection device according to an embodiment of the present utility model.

[0027] Explanation of the numbers in the schematic diagram: 1. First guide rail; 11. First linear guide rail; 12. Second linear guide rail; 13. First support frame; 14. First slider; 2. Second guide rail; 21. Third linear guide rail; 22. Fourth linear guide rail; 23. Second support frame; 24. Second slider; 3. First camera; 4. Second camera; 5. First roller; 6. Second roller; 7. Pole piece. DETAILED DESCRIPTION

[0028] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0029] Example

[0030] like Figure 1 The figure shows a lithium battery surface defect detection device provided by this embodiment. The lithium battery surface defect detection device includes a photographing device and a conveying device. The photographing device includes a first camera 3, a second camera 4, a first guide rail 1 and a second guide rail 2. The conveying device includes a first roller 5 and a second roller 6.

[0031] In this embodiment, a light-emitting component is disposed on the first and second rollers 5, 6. This component provides light for the first and second cameras 3, 4 to capture images of the surface of the electrode piece 7. Specifically, the light-emitting component includes a light-emitting layer wrapped around the surface of the first and second rollers 5, 6. The light-emitting layer is composed of a light-emitting material, which produces a luminous effect. In this embodiment, the light-emitting material used is conventional. It should be noted that in this embodiment, the first and second rollers 5, 6 can be configured to have a central cavity, with the light-emitting component disposed within the cavity. A light-transmitting structure is disposed on the first and second rollers 5, 6, and the light-transmitting structure is wrapped with a protective layer. Thus, by disposing the light-emitting component within the cavity of the first and second rollers 5, 6, the light from the light-emitting component is emitted through the light-transmitting structure, providing light for the first and second cameras 3, 4 to capture images of the surface of the electrode piece 7. This solves the limitations of CCD light position and mounting angle without occupying additional space, effectively improving the efficiency of lithium battery surface defect detection. In this embodiment, the light-emitting component used is conventional, such as a light-emitting diode. The protective layer wrapped around the light-transmitting structures of the first and second rollers 5 and 6 protects the light-emitting components from damage. In this embodiment, the protective layer can be a transparent, high-hardness glass shell, thereby allowing the light emitted by the LED tube to be emitted through the glass shell to achieve illumination.

[0032] Furthermore, the first roller 5 is set on one side of the pole piece 7, the second roller 6 is set on the other side of the pole piece 7, the first camera 3 is set on one side of the pole piece 7, and the second camera 4 is set on the other side of the pole piece 7. The first roller 5 and the second roller 6 are fixedly set between the first camera 3 and the second camera 4. By setting the first roller 5 and the second roller 6 in fixed positions, the first roller 5 and the second roller 6 can be directly installed before the pole piece 7 enters the site, and there is no need to change the position later, which effectively reduces the debugging time of the lithium battery surface defect detection device and saves labor and time costs. Therefore, the light-emitting component on the first roller 5 provides a light source for the first camera 3 to capture an image of one side of the pole piece 7, and the light-emitting component on the second roller 6 provides a light source for the second camera 4 to capture an image of the other side of the pole piece 7.

[0033] In this embodiment, the first and second rollers 5 and 6 are also arranged in parallel, and the plane formed by the first and second rollers 5 and 6 is inclined relative to the horizontal plane. Furthermore, when the first and second rollers 5 and 6 are arranged at an inclined angle relative to the horizontal plane, the shooting angles of the first and second cameras 3 and 4 can be fixed. As a result, the first and second cameras 3 and 4 can obtain a wider shooting angle, thereby fully and clearly capturing the surface image of the electrode 7. Furthermore, when a subsequent electrode 7 enters the field, it can be directly photographed by the first and second cameras 3 and 4, without the need to subsequently move the shooting positions of the first and second cameras 3 and 4. This effectively reduces the debugging time of the lithium battery surface defect detection device, saving both labor and time costs.

[0034] In this embodiment, the first camera 3 is mounted on the first guide rail 1, which includes a first linear guide 11, a second linear guide 12, a first support frame 13, and a first slider 14. The first slider 14 is movably mounted on the first support frame 13, one side of the first slider 14 is connected to the first linear guide 11, and the other side of the first slider 14 is connected to the second linear guide 12. The first camera 3 is fixedly mounted on the first slider 14. The second camera 4 is mounted on the second guide rail 2, which includes a third linear guide 21, a fourth linear guide 22, a second support frame 23, and a second slider 24. The second slider 24 is movably mounted on the second support frame 23, one side of the second slider 24 is connected to the third linear guide 21, and the other side of the second slider 24 is connected to the fourth linear guide 22. The second camera 4 is fixedly mounted on the second slider 24.

[0035] Thus, by installing the first camera 3 and the second camera 4 on the first guide rail 1 and the second guide rail 2, respectively, the first camera 3 and the second camera 4 can find the optimal angle to shoot the surface image of the pole piece 7. The structure is simple, space is saved, and effective detection of the lithium battery surface is achieved, thereby ensuring product quality. Specifically, the first camera 3 and the second camera 4 are fixedly mounted on the first slider 14 and the second slider 24, respectively. By tilting the first roller 5 and the second roller 6 relative to the horizontal plane, the first camera 3 and the second camera 4 can find the optimal angle to shoot the surface image of the pole piece 7 as the first slider 14 and the second slider 24 move, respectively. In addition, the first linear guide 11 and the second linear guide 12 provide support for the first support frame 13 and the first slider 14 to prevent the first slider 14 from falling off. The third linear guide 21 and the fourth linear guide 22 provide support for the second support frame 23 and the second slider 24 to prevent the second slider 24 from falling off.

[0036] Therefore, the present embodiment provides a lithium battery surface defect detection device. When the pole piece 7 is conveyed between the first roller 5 and the second roller 6, the first roller 5 and the second roller 6 bend the pole piece 7. At the same time, the first roller 5 and the second roller 6 also provide light sources for the first camera 3 and the second camera 4 to capture the surface image of the pole piece 7 through the light-emitting components provided thereon. The first slider 14 on the first guide rail 1 and the second slider 24 on the second guide rail 2 are slid, so that the first camera 3 and the second camera 4 can find the optimal shooting angle to capture the surface image of the pole piece 7 comprehensively and clearly. The surface image of the pole piece 7 is used to determine whether there are defects on the surface of the pole piece 7. This solves the problem of CCD light position and installation angle limitations without occupying additional space, and effectively improves the efficiency of lithium battery surface defect detection.

[0037] The above schematically describes the invention of the present invention and its implementation methods. This description is not restrictive. Without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. What is shown in the accompanying drawings is only one of the implementation methods of the invention of the present invention. The actual structure is not limited to this. Any figure mark in the claims should not limit the claims involved. Therefore, if ordinary technicians in this field are inspired by it, without departing from the purpose of the invention, they can design structural methods and embodiments similar to the technical solution without creativity, which should all fall within the scope of protection of the present invention. In addition, the word "including" does not exclude other elements or steps, and the word "one" before an element does not exclude the inclusion of "multiple" elements. The multiple elements stated in the product claim can also be implemented by one element through software or hardware. Words such as first and second are used to indicate names, and do not indicate any specific order.

Claims

1. A lithium battery surface defect detection device, comprising a photographing device and a conveying device, wherein the photographing device comprises a first camera (3) and a second camera (4), and the conveying device comprises a first roller (5) and a second roller (6), characterized in that: Light-emitting components are provided on the first roller (5) and the second roller (6); the first roller (5) is provided on one side of the pole piece (7), and the second roller (6) is provided on the other side of the pole piece (7); the first camera (3) is provided on one side of the pole piece (7), and the second camera (4) is provided on the other side of the pole piece (7); the first roller (5) and the second roller (6) are fixedly provided between the first camera (3) and the second camera (4).

2. A lithium battery surface defect detection device according to claim 1, characterized in that: The light-emitting component comprises a light-emitting layer wrapped on the surface of the first roller (5) and the surface of the second roller (6).

3. The lithium battery surface defect detection device according to claim 1, characterized in that: A cavity is provided in the middle of the first passing roller (5) and the second passing roller (6), and the light-emitting component is arranged in the cavity; and a light-transmitting structure is provided on the first passing roller (5) and the second passing roller (6).

4. A lithium battery surface defect detection device according to claim 3, wherein the light-transmitting structure is wrapped with a protective layer.

5. A lithium battery surface defect detection device according to claim 2 or 3, characterized in that: The first passing roller (5) and the second passing roller (6) are arranged in parallel, and the plane formed by the first passing roller (5) and the second passing roller (6) is inclined relative to the horizontal plane.

6. The lithium battery surface defect detection device according to claim 1, characterized in that: The shooting device further comprises a first guide rail (1) and a second guide rail (2); the first camera (3) is mounted on the first guide rail (1); and the second camera (4) is mounted on the second guide rail (2).

7. A lithium battery surface defect detection device according to claim 6, characterized in that: The first guide rail (1) comprises a first support frame (13) and a first slider (14); the first slider (14) is movably mounted on the first support frame (13); and the first camera (3) is fixedly mounted on the first slider (14).

8. The lithium battery surface defect detection device according to claim 7, characterized in that: The first guide rail (1) further comprises a first linear guide rail (11) and a second linear guide rail (12); one side of the first slider (14) is connected to the first linear guide rail (11); and the other side of the first slider (14) is connected to the second linear guide rail (12).

9. The lithium battery surface defect detection device according to claim 6, characterized in that: The second guide rail (2) comprises a second support frame (23) and a second slider (24); the second slider (24) is movably mounted on the second support frame (23); and the second camera (4) is fixedly mounted on the second slider (24).

10. The lithium battery surface defect detection device according to claim 9, characterized in that: The second guide rail (2) further comprises a third linear guide rail (21) and a fourth linear guide rail (22); one side of the second slider (24) is connected to the third linear guide rail (21); and the other side of the second slider (24) is connected to the fourth linear guide rail (22).

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