Battery piece scanning imaging device and battery piece defect detection system

Abstract

The utility model discloses a battery piece scanning imaging device and a battery piece defect detection system. The battery piece scanning imaging device comprises a light source, a camera and a lens. The light source is used for emitting light to a preset position, and the camera is connected with the lens and used for receiving light reflected by the battery piece moving to the preset position and penetrating through the lens for imaging. Wherein the camera is a color line-scan digital camera. According to the battery piece scanning imaging device and the battery piece defect detection system, the camera adopts the color line-scan digital camera instead of the traditional black and white line-scan digital camera, so that the metal exposure defect at the edge of the battery piece can be effectively distinguished.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell defect detection, and in particular to a battery cell scanning imaging device and a battery cell defect detection system. Background Art

[0002] During the production process of crystalline silicon solar cells, metal exposure may occur at the edge of the cell. For example, during the XBC process (including texturing, diffusion, post-cleaning, anti-reflection film and screen coating, sintering, etc.), there is a certain probability that metal will be exposed at the side edge of the cell, and this defect will cause the cell to conduct and short-circuit. Therefore, how to detect the defect of metal exposure at the edge of the cell is an important issue in the production process of the cell. Utility Model Content

[0003] The embodiments of the present application provide a battery cell scanning imaging device and a battery cell defect detection system to solve at least one of the above-mentioned technical problems.

[0004] The battery sheet scanning imaging device of the embodiment of the present application comprises a light source, a camera and a lens, wherein the light source is used to emit light to a predetermined position, and the camera is connected to the lens to receive light reflected by the battery sheet moving to the predetermined position and passing through the lens to form an image;

[0005] Wherein, the camera is a color line array camera.

[0006] In some embodiments, the cell scanning imaging device further includes a reflector, which is fixedly disposed at an end of the lens opposite to the camera and is used to reflect the light reflected by the cell at the predetermined position to the lens.

[0007] In some embodiments, the cell scanning imaging device further includes a fixing frame arranged on the sides of the camera, the lens and the reflector, and a first locking member and a second locking member;

[0008] The camera is fixed to the fixing frame via the first locking member, and the reflective member is fixed to the fixing frame via the second locking member.

[0009] In some embodiments, the cell scanning imaging device further includes a carrier platform, a first carrier and a second carrier, the light source is disposed on the carrier platform via the first carrier, and the reflector is disposed on the carrier platform via the second carrier.

[0010] In some embodiments, the battery cell scanning imaging device further includes a third locking member, and the second carrier member locks the reflective member through the third locking member.

[0011] In some embodiments, the battery cell scanning imaging device further includes a fine-tuning structure, which is movably disposed on the carrier platform and is used to adjust the distance between the lens and the predetermined position.

[0012] In some embodiments, the fine-tuning structure includes a first abutting member and a second abutting member, and the first abutting member and the second abutting member are capable of relative movement to abut the second supporting member from opposite sides of the second supporting member.

[0013] In some embodiments, the lens is a telecentric lens.

[0014] In some embodiments, the color line scan camera comprises a CMOS color line scan camera or a CCD color line scan camera.

[0015] The battery cell defect detection system of the embodiment of the present application includes:

[0016] A cell scanning imaging device according to any one of the above embodiments; and

[0017] A defect detection device is used to perform defect detection based on the image obtained by the battery cell scanning imaging device.

[0018] In the battery cell scanning imaging device and battery cell defect detection system of the implementation mode of the present application, the camera adopts a color line array camera to replace the traditional black and white line array camera, which can effectively distinguish the metal exposure defects at the edge of the battery cell.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for the implementation methods or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. Among them:

[0021] Figure 1 It is a structural schematic diagram of a cell scanning imaging device from one viewing angle in certain embodiments of the present application;

[0022] Figure 2 is a schematic structural diagram of a cell scanning imaging device according to certain embodiments of the present application from another perspective;

[0023] Figure 3It is a schematic diagram of a metal exposure defect on the edge of a cell captured by a black and white linear array camera in the related art;

[0024] Figure 4 It is a schematic diagram of a non-defective portion of the edge of a cell captured by a black and white linear array camera in the related art;

[0025] Figure 5 is a schematic diagram of a metal exposure defect on the edge of a cell captured by a color line array camera in certain embodiments of the present application;

[0026] Figure 6 is a schematic diagram of a non-defective edge portion of a cell captured by a color line array camera in certain embodiments of the present application;

[0027] Figure 7 is a schematic diagram of a non-defective edge portion of a cell captured by a color line array camera in certain embodiments of the present application;

[0028] Figure 8 is a schematic diagram of the working principle of the reflector of certain embodiments of the present application;

[0029] Fig. 9 It is a module schematic diagram of a battery cell defect detection system in certain embodiments of the present application.

[0030] Description of reference numerals:

[0031] Battery cell scanning imaging device 100, light source 10, camera 20, lens 30, top 31, bottom 32, reflector 40, reflective surface 41, fixing frame 50, first locking member 51, second locking member 52, supporting platform 60, first supporting member 70, second supporting member 80, third locking member 81, fine-tuning structure 90, first supporting member 91, second supporting member 92, defect detection device 200, battery cell defect detection system 1000. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0033] See also Figure 1 and Figure 2The embodiment of the present application provides a cell scanning imaging device 100. The cell scanning imaging device 100 includes a light source 10, a camera 20 and a lens 30. The light source 10 is used to emit light to a predetermined position. The camera 20 is connected to the lens 30 and is used to receive light reflected by the cell moving to the predetermined position and passing through the lens 30 to form an image. Among them, the camera 20 is a color line array camera.

[0034] In the battery cell scanning imaging device 100 of the embodiment of the present application, the camera 20 adopts a color line array camera to replace the traditional black and white line array camera, which can effectively distinguish the metal exposure defects at the edge of the battery cell.

[0035] Specifically, the cell may be a crystalline silicon solar cell. The light source 10 is used to emit light to a predetermined position, and the predetermined position may be the junction of the illumination field of the light source 10 and the shooting field of the lens 30 (eg Figure 1 When the cell moves to a predetermined position, the light emitted by the light source 10 irradiates the edge of the cell, and after being reflected, passes through the lens 30 to reach the camera 20, thereby imaging the moving cell.

[0036] It is understandable that in the production process of battery cells, there is a certain probability that metal exposure will occur at the edge of the battery cell. In the related art, using a black and white linear array camera to obtain images of battery cells cannot effectively distinguish metal exposure defects at the edge of the battery cell (such as Figure 3 as shown) and some non-defective parts (such as Figure 4 shown).

[0037] In the embodiment of the present application, the camera 20 is a color line array camera. If there is a metal exposed defect at the edge of the cell, the defect is illuminated by the light source 10 and appears as a bright red copper color (such as Figure 5 As shown in FIG. 1 ). However, some non-defective interference is illuminated by the light source 10 and appears as light yellow in the image of the cell captured by the color line array camera (as shown in FIG. 1 ). Figure 6 as shown) or white (as Figure 7 As shown in the figure). In this way, the metal exposure defect at the edge of the cell can be effectively distinguished from some non-defect interference (different colors).

[0038] The cell scanning imaging device 100 of the embodiment of the present application can be adapted to an online or offline machine to meet the actual production mode of the machine, and can image the moving cell. It can detect the exposed metal defects at the edge of the cell in the corresponding process section, and at the same time, the collected image can be output to the host computer through the data interface, and then cooperate with the relevant software system to detect and identify defects, and then the relevant detection results are fed back to the relevant actuator (such as cell production equipment or cell detection equipment) for processing to ensure that no defective cells flow out of the detection station.

[0039] It should be noted that the camera 20 of the embodiment of the present application adopts a color line array camera. When the line array camera is working, it is necessary to ensure that the sample being photographed moves relative to the line array camera to collect a complete and clear image. Therefore, the battery cell of the embodiment of the present application needs to move relative to the camera 20 and pass through a predetermined position. When different positions of the battery cell move through the predetermined position, the camera 20 collects image information corresponding to different positions of the battery cell, so as to finally obtain a complete and clear image of the battery cell for subsequent defect detection.

[0040] See also Figure 1 and Figure 8 In some embodiments, the cell scanning imaging device 100 further includes a reflector 40. The reflector 40 is fixedly disposed at an end of the lens 30 opposite to the camera 20, and is used to reflect the light reflected by the cell at a predetermined position to the lens 30.

[0041] Specifically, the lens 30 may include a top 31 and a bottom 32 opposite to each other. The camera 20 is fixedly disposed on the top 31. The reflector 40 is fixedly disposed on an end of the lens 30 opposite to the camera 20, that is, the reflector 40 is fixedly disposed on the bottom 32.

[0042] The reflector 40 can be a turning prism, which has a simple structure and is easy to install. The reflector 40 is located between the predetermined position and the lens 30 in the optical path of the cell scanning imaging device 100. The light reflected by the cell at the predetermined position is incident on the reflector 40, and is reflected by the reflector 40 to the lens 30, so as to finally form an image in the camera 20. The reflector 40 can be tilted relative to the lens 30, that is, the reflective surface 41 of the reflector 40 forms an angle with the optical axis of the lens 30 (such as Figure 8 In one example, the angle may be 45 degrees.

[0043] Of course, in other examples, the reflector 40 may not be a turning prism, and the reflector 40 may be any element with a reflective function, which is not limited here.

[0044] See also Figure 1 and Figure 2 In some embodiments, the cell scanning imaging device 100 further includes a fixing frame 50 disposed on the side of the camera 20, the lens 30 and the reflector 40, and a first locking member 51 and a second locking member 52. The camera 20 is fixed to the fixing frame 50 by the first locking member 51, and the reflector 40 is fixed to the fixing frame 50 by the second locking member 52.

[0045] Specifically, the fixing frame 50 can be located on the side of the camera 20, the lens 30 and the reflector 40 opposite to the predetermined position, so as to facilitate the installation of the fixing frame 50 and facilitate the overall component arrangement of the battery cell scanning imaging device 100 to avoid limited installation space. The fixing frame 50 extends along the height direction of the lens 30, one end of which is used to fix the camera 20 at the top 31 of the lens 30, and the other end of which is used to fix the reflector 40 at the bottom 32 of the lens 30. Since the top 31 of the lens 30 is fixedly assembled with the camera 20, and the bottom 32 of the lens 30 is fixedly assembled with the reflector 40, the fixing frame 50, the camera 20, the lens 30, and the reflector 40 can be relatively fixed.

[0046] Furthermore, since the camera 20 is fixed to the fixing frame 50 by the first locking member 51, and the reflector 40 is fixed to the fixing frame 50 by the second locking member 52, the two ends of the fixing frame 50 respectively form a double locking structure with the camera 20 and the reflector 40, which can prevent the structural parts from being too heavy and causing shaking or vibration to affect the imaging quality. In one example, the first locking member 51 and the second locking member 52 can be screws. Screw holes can be formed at corresponding positions of the fixing frame 50, and the camera 20 and the reflector 40. The screw passes through the fixing frame 50 and the camera 20 in sequence to achieve the fixing of the fixing frame 50 and the camera 20, and the screw passes through the fixing frame 50 and the reflector 40 in sequence to achieve the fixing of the fixing frame 50 and the reflector 40.

[0047] See also Figure 1 In some embodiments, the cell scanning imaging device 100 further includes a carrier 60, a first carrier 70 and a second carrier 80. The light source 10 is disposed on the carrier 60 through the first carrier 70, and the reflector 40 is disposed on the carrier 60 through the second carrier 80.

[0048] Specifically, the carrier 60 may be in the shape of a plate, and the first carrier 70 and the second carrier 80 may be in the shape of a column, such as a cylindrical column or a square column, etc. The heights of the first carrier 70 and the second carrier 80 may be equal, so that the light source 10 and the reflector 40 are located at the same height above the carrier 60, so that the reflector 40 can receive the light emitted by the light source 10 and reflected by the battery sheet at a predetermined position.

[0049] See also Figure 1 In some embodiments, the battery cell scanning imaging device 100 further includes a third locking member 81. The second carrier 80 locks the reflective member 40 through the third locking member 81.

[0050] Specifically, when the reflector 40 is assembled with the second carrier 80, the bottom shell (not shown) of the reflector 40 can be partially accommodated in the second carrier 80 and locked by the third locking member 81 to reduce the shaking or vibration of the reflector 40 and affect the imaging quality. In one example, the third locking member 81 can include a bolt and a nut structure. The bolt passes through the second carrier 80 and is fixed by a nut to achieve the locking of the second carrier 80 to the reflector 40 accommodated therein.

[0051] In some embodiments, the lens 30 is a telecentric lens.

[0052] In this way, the lens 30 adopts a telecentric lens to ensure a constant magnification, which helps to achieve parallax elimination and low distortion.

[0053] Specifically, when inspecting objects that are not on the same plane, ordinary industrial lenses require adjustment of magnification to obtain clear and consistent images, while the image magnification of telecentric lenses is not affected by the position of the object, does not change due to changes in object distance, and has high stability. Telecentric lenses also have the advantages of low distortion and parallax elimination, and are particularly suitable for visual inspection projects that require high-precision measurement capabilities.

[0054] See also Figure 1 In some embodiments, the cell scanning imaging device 100 further includes a fine-tuning structure 90. The fine-tuning structure 90 is movably disposed on the carrier 60 to adjust the distance between the lens 30 and a predetermined position.

[0055] Specifically, the lens 30 may be a fixed-distance telecentric lens. The fine-tuning structure 90 is used to adjust the distance between the lens 30 and the predetermined position, so as to facilitate the lens 30 to quickly debug and focus, and shorten the online adjustment time. The fine-tuning structure 90 is movably arranged on the carrier 60, and its moving direction may be the direction of the line connecting the predetermined position to the reflector 40.

[0056] In some embodiments, the fine-tuning structure 90 includes a first abutting member 91 and a second abutting member 92. The first abutting member 91 and the second abutting member 92 can move relative to each other to abut the second carrier 80 from opposite sides of the second carrier 80.

[0057] Specifically, the first abutting member 91 can move on one side of the second carrier 80 in the direction of the line from the predetermined position to the reflector 40. The second abutting member 92 can move on the other side of the second carrier 80 in the direction of the line from the predetermined position to the reflector 40. When the lens 30 needs to be debugged and focused, the second carrier 80 can be moved in the direction of the line from the predetermined position to the reflector 40 to drive the reflector 40, the lens 30 and the camera 20 above it to move, thereby achieving the debugging and focusing of the lens 30. After the focusing is completed, the first abutting member 91 and the second abutting member 92 are moved so that the first abutting member 91 and the second abutting member 92 abut the second carrier 80 from the opposite sides of the second carrier 80, thereby achieving the fixing of the position of the lens 30.

[0058] In certain embodiments, the color line array camera includes a complementary metal oxide semiconductor (CMOS) color line array camera or a charge coupled device (CCD) color line array camera.

[0059] Specifically, CMOS color line array cameras have the advantages of low power consumption, low cost and high integration, while CCD color line array cameras have the advantages of high image quality, high resolution and high signal-to-noise ratio. The specific selection can be based on the actual application scenarios and needs.

[0060] See also Fig. 9 The embodiment of the present application provides a cell defect detection system 1000. The cell defect detection system 1000 includes a cell scanning imaging device 100 and a defect detection device 200 of any of the above embodiments. The defect detection device 200 is used to perform defect detection based on the image acquired by the cell scanning imaging device 100.

[0061] In the battery cell defect detection system 1000 of the embodiment of the present application, the camera 20 adopts a color line array camera to replace the traditional black and white line array camera, which can effectively distinguish the metal exposure defects at the edge of the battery cell.

[0062] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0063] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0065] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific processes and examples of materials, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", "some examples", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0067] Although the embodiments of the present application have been shown and described above, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell scanning imaging device, characterized in that: It includes a light source, a camera and a lens, wherein the light source is used to emit light to a predetermined position, and the camera is connected to the lens and is used to receive light reflected by the battery sheet moving to the predetermined position and passing through the lens to form an image; Wherein, the camera is a color line array camera.

2. The battery cell scanning imaging device according to claim 1, characterized in that: The cell scanning imaging device further comprises a reflector, which is fixedly arranged at an end of the lens opposite to the camera and is used to reflect the light reflected by the cell at the predetermined position to the lens.

3. The battery cell scanning imaging device according to claim 2, characterized in that: The cell sheet scanning imaging device further comprises a fixing frame arranged at the sides of the camera, the lens and the reflector, and a first locking member and a second locking member; The camera is fixed to the fixing frame via the first locking member, and the reflective member is fixed to the fixing frame via the second locking member.

4. The cell scanning imaging device according to claim 2, characterized in that: The cell scanning imaging device further comprises a carrier platform, a first carrier component and a second carrier component. The light source is disposed on the carrier platform via the first carrier component, and the reflector is disposed on the carrier platform via the second carrier component.

5. The battery cell scanning imaging device according to claim 4, characterized in that: The battery slice scanning imaging device further comprises a third locking member, and the second carrier member locks the reflective member through the third locking member.

6. The battery cell scanning imaging device according to claim 4, characterized in that: The battery slice scanning imaging device further comprises a fine-tuning structure, which is movably disposed on the carrier platform and is used to adjust the distance between the lens and the predetermined position.

7. The battery cell scanning imaging device according to claim 6, characterized in that: The fine-tuning structure includes a first abutting member and a second abutting member, and the first abutting member and the second abutting member are capable of relative movement to abut the second bearing member from opposite sides of the second bearing member.

8. The battery cell scanning imaging device according to claim 1, characterized in that: The lens is a telecentric lens.

9. The battery cell scanning imaging device according to claim 1, characterized in that: The color line array camera includes a CMOS color line array camera or a CCD color line array camera.

10. A battery cell defect detection system, characterized in that: include: The cell scanning imaging device according to any one of claims 1 to 9; and A defect detection device is used to perform defect detection based on the image obtained by the battery cell scanning imaging device.

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