Visual inspection mechanism for photovoltaic module

Abstract

The utility model provides a photovoltaic assembly visual inspection mechanism, which comprises a lamp box and a visual assembly, the lamp box is fixed on an external rack, and the visual assembly is fixed on the external rack, is positioned on one side, far away from a photovoltaic assembly, of the lamp box and faces the photovoltaic assembly; the lamp box comprises a lamp box body, a plurality of panel lamps, a plurality of light scattering plates and a light shielding plate, the panel lamps are fixed to one side of the lamp box body in a separated mode, the light scattering plates are fixed to the same side of the lamp box body in a separated mode and located between the panel lamps and outside the panel lamps, and the light shielding plate is fixed to the middle of the lamp box body. According to the visual detection mechanism for the photovoltaic module, the visual module, the photovoltaic module and the plurality of panel lamps are separated, so that light of the plurality of panel lamps reaches the surface of the photovoltaic module through scattering and transmission, light spot irradiation is avoided, light spots are prevented from appearing in an image shot by the visual module, and the visual detection mechanism for the photovoltaic module can well detect the photovoltaic module.

Description

Technical Field

[0001] This utility model belongs to the technical field of photovoltaic module manufacturing equipment, and in particular relates to a visual inspection mechanism for photovoltaic modules. Background Technology

[0002] See Figure 1 The photovoltaic module 10 consists of a solar panel 11, a frame 12, and an electrical connector group 13. The electrical connector group 13 is generally located in the middle or end of the photovoltaic module 10 along its length. Figure 1 The first electrical connector 131, the second electrical connector 132, and the third electrical connector 133 are arranged in a wide direction for outputting the electricity generated by the photovoltaic module 10. The solar panel 11 is composed of battery cells connected in series and in parallel. Before, during, and after lamination in the photovoltaic module production process, the photovoltaic module needs to undergo EL (electroluminescence) inspection and appearance inspection on both the top and bottom surfaces. The image classification and data analysis are performed by applying AI vision algorithms through machine vision and comparing with standard images to determine whether there are EL (electroluminescence) defects and appearance defects, and to judge whether the quality of the photovoltaic module battery cells and the appearance of the photovoltaic module are qualified.

[0003] The principle of EL (electroluminescence) is the opposite of PV (photovoltaic). By applying a forward bias voltage (DC 10V~50V) to the solar panel's cell array, a large number of non-equilibrium carriers are injected into the cells. These non-equilibrium carriers continuously recombine with the cell's charge carriers, emitting photons and emitting light. A CCD camera captures these photons, and the resulting image is processed by a computer to obtain an EL image. The brightness of the EL image is proportional to the minority carrier diffusion length and current density of the cell. Areas with defects have shorter minority carrier diffusion lengths, resulting in a darker image. Therefore, EL images are used to effectively detect problems such as microcracks, sintering defects, black cores, and mixed grades in solar cells. EL inspection utilizes the EL principle to inspect the solar panel's cells, and is used for online inspection on photovoltaic module production lines, fault diagnosis during photovoltaic module operation, and performance monitoring.

[0004] Visual inspection involves using a CCD camera to photograph photovoltaic modules and then employing image recognition to detect defects such as dimensional deviations, missing corners, chipped edges, misaligned cells, misaligned busbars, and dirt. Visual inspection is used for online inspection on photovoltaic module production lines.

[0005] Before being framed, photovoltaic modules have relatively poor overall rigidity during photography, making them prone to image distortion. The large size of photovoltaic modules also places high demands on camera field of view and light source, creating stringent requirements for the overall photographic environment and making image glare susceptible to occur. Image distortion and image glare affect the consistency and accuracy of test results.

[0006] To overcome the impact of image distortion and image spot on the consistency and accuracy of inspection results, we developed a photovoltaic module visual inspection mechanism for photographing photovoltaic modules.

[0007] 1. Use an EL camera (5 megapixels, 2736×1824 resolution) to inspect the CCD, and a CCD camera (20 megapixels, 5480×3648 resolution) to inspect the appearance of the top and bottom surfaces.

[0008] 2. The use of LED lighting with ambient light diffusion creates softer lighting in the shooting environment, resulting in better photo quality. Utility Model Content

[0009] The purpose of this utility model is to provide a photovoltaic module visual inspection mechanism for inspecting photovoltaic modules. The mechanism includes a light box and a visual component. The light box is fixed to an external frame, and the visual component is also fixed to the external frame, located on the side of the light box away from the photovoltaic module and facing the photovoltaic module. The light box includes a light box body, multiple panel lights, multiple diffusers, and a light shield. The multiple panel lights are fixedly positioned on one side of the light box body, and the multiple diffusers are fixedly positioned on the same side of the light box body, located between and outside the multiple panel lights. The light shield is fixed in the middle of the light box body, separating the visual component, the photovoltaic module, and the multiple panel lights. This allows the light from the multiple panel lights to reach the surface of the photovoltaic module through scattering and transmission, avoiding light spot illumination and thus preventing image light spots.

[0010] Furthermore, the lightbox also includes a lightbox frame, with the lightbox body fixed on the lightbox frame. The top or bottom surface of the lightbox body is provided with multiple lightbox camera holes for the vision component to take pictures inside the lightbox.

[0011] Furthermore, the vision component includes a camera mounting beam, multiple appearance inspection units, and multiple EL inspection units. The camera mounting beam is fixed to the lightbox frame, and the multiple appearance inspection units and multiple EL inspection units are all fixed to the camera mounting beam. The multiple appearance inspection units and multiple EL inspection units are located in multiple lightbox camera holes and face the photovoltaic module.

[0012] Furthermore, the visual inspection unit includes a visual inspection camera mounting plate, a visual inspection camera, and a visual inspection lens. The visual inspection camera mounting plate is fixed on the camera mounting beam, the visual inspection camera is fixed on the visual inspection camera mounting plate, and the visual inspection lens is fixed on the visual inspection camera, located inside the camera hole of the light box facing the photovoltaic module, for taking pictures of local areas of the photovoltaic module. Multiple visual inspection units take pictures of different areas of the photovoltaic module in sections, and the background image software then stitches the images of multiple areas into an image of the entire photovoltaic module for visual inspection.

[0013] Furthermore, the EL inspection unit includes an EL inspection camera mounting plate, an EL inspection camera, and an EL inspection lens. The EL inspection camera mounting plate is fixed on the camera mounting beam and located next to the appearance inspection camera mounting plate. The EL inspection camera is fixed on the EL inspection camera mounting plate, and the EL inspection lens is fixed on the EL inspection camera and located inside the camera hole of the light box, facing the photovoltaic module. It is used to take pictures of local areas of the photovoltaic module. Multiple EL inspection units take pictures of different areas of the photovoltaic module in sections. The background image software then stitches the images of multiple areas into an image of the entire photovoltaic module for EL inspection.

[0014] The beneficial effects of a photovoltaic module visual inspection mechanism are as follows:

[0015] The lightbox is fixed to an external frame, and the vision module is also fixed to the external frame, located on the side of the lightbox away from the photovoltaic module and facing the photovoltaic module. The lightbox includes a lightbox body, multiple panel lights, multiple diffusers, and a light shield. The multiple panel lights are fixed separately on one side of the lightbox body, and the multiple diffusers are fixed separately on the same side of the lightbox body, located between and outside the multiple panel lights. The light shield is fixed in the middle of the lightbox body, separating the vision module, the photovoltaic module, and the multiple panel lights. This allows the light from the multiple panel lights to reach the surface of the photovoltaic module through scattering and transmission, avoiding light spots in the image captured by the vision module. This photovoltaic module vision inspection mechanism can effectively inspect photovoltaic modules. Attached Figure Description

[0016] Figure 1 Schematic diagram of photovoltaic module;

[0017] Figure 2 Visual inspection mechanism structure diagram;

[0018] Figure 3 Lightbox structure diagram;

[0019] Figure 4 Visual component structure diagram.

[0020] Explanation of reference numerals in the attached figures:

[0021] 10. Photovoltaic module; 11. Solar panel; 12. Frame; 13. Electrical connector assembly; 131. First electrical connector; 132. Second electrical connector; 133. Third electrical connector;

[0022] 700. Photovoltaic module visual inspection agency;

[0023] 710. Lightbox; 711. Lightbox frame; 712. Lightbox body; 7121. Lightbox camera hole; 713. Panel light; 714. Diffuser; 715. Light shield;

[0024] 720. Vision component; 721. Camera mounting beam; 722. Visual inspection unit; 7221. Visual inspection camera mounting plate; 7222. Visual inspection camera; 7223. Visual inspection lens;

[0025] 723. EL inspection unit; 7231. EL inspection camera mounting plate; 7232. EL inspection camera; 7233. EL inspection lens. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, used to refer to a fixed connection, as well as a detachable connection, or an integral connection; used to refer to a direct connection, as well as an indirect connection through an intermediate medium, and used to refer to the internal communication of two components. For those skilled in the art, the specific meaning of the terms in this utility model is understood according to the specific circumstances.

[0028] See Figure 2This embodiment provides a photovoltaic module visual inspection mechanism 700 for inspecting photovoltaic modules 10. It includes a light box 710 and a visual component 720. The light box 710 is fixed on an external frame, and the visual component 720 is fixed on the external frame, located on the side of the light box 710 away from the photovoltaic module 10 and facing the photovoltaic module 10. The light box 710 includes a light box body 712, multiple panel lights 713, multiple diffuser plates 714, and a light shield 715. The multiple panel lights 713 are fixed on one side of the light box body 712, and the multiple diffuser plates 714 are fixed on the same side of the light box body 712, located between and outside the multiple panel lights 713. The light shield 715 is fixed in the middle of the light box body 712, separating the visual component 720, the photovoltaic module 10, and the multiple panel lights 713, so that the light from the multiple panel lights 713 reaches the surface of the photovoltaic module 10 through scattering and transmission, avoiding light spot illumination and thus avoiding image light spots.

[0029] Further, see Figure 3 The lightbox 710 also includes a lightbox frame 711, and a lightbox body 712 is fixed on the lightbox frame 711. The top or bottom surface of the lightbox body 712 is provided with multiple lightbox camera holes 7121 for the vision component 720 to penetrate the lightbox 710 to take pictures.

[0030] Furthermore, see Figure 4 The vision component 720 includes a camera mounting beam 721, multiple appearance inspection units 722 and multiple EL inspection units 723. The camera mounting beam 721 is fixed to the light box frame 711. The multiple appearance inspection units 722 and multiple EL inspection units 723 are all fixed to the camera mounting beam 721. The multiple appearance inspection units 722 and multiple EL inspection units 723 are respectively located in multiple light box camera holes 7121 and face the photovoltaic module 10.

[0031] Furthermore, see Figure 4 The appearance inspection unit 722 includes an appearance inspection camera mounting plate 7221, an appearance inspection camera 7222, and an appearance inspection lens 7223. The appearance inspection camera mounting plate 7221 is fixed on the camera mounting beam 721, the appearance inspection camera 7222 is fixed on the appearance inspection camera mounting plate 7221, and the appearance inspection lens 7223 is fixed on the appearance inspection camera 7222. It is located inside the camera hole 7121 of the light box and faces the photovoltaic module 10. It is used to take pictures of local areas of the photovoltaic module 10. Multiple appearance inspection units 722 take pictures of different areas of the photovoltaic module 10 in sections. The background image software then stitches the images of multiple areas into an image of the entire photovoltaic module 10 for appearance inspection.

[0032] Furthermore, see Figure 4The EL inspection unit 723 includes an EL inspection camera mounting plate 7231, an EL inspection camera 7232, and an EL inspection lens 7233. The EL inspection camera mounting plate 7231 is fixed on the camera mounting beam 721 and located next to the appearance inspection camera mounting plate 7221. The EL inspection camera 7232 is fixed on the EL inspection camera mounting plate 7231. The EL inspection lens 7233 is fixed on the EL inspection camera 7232 and located inside the light box camera hole 7121 facing the photovoltaic module 10. It is used to take pictures of local areas of the photovoltaic module 10. Multiple EL inspection units 723 take pictures of different areas of the photovoltaic module 10 in sections. The background image software then stitches the images of multiple areas into an image of the entire photovoltaic module 10 for EL inspection.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A photovoltaic module visual inspection mechanism (700) for inspecting photovoltaic modules (10), comprising a light box (710) and a vision component (720), wherein the light box (710) is fixed on an external frame, and the vision component (720) is fixed on the external frame, located on the side of the light box (710) away from the photovoltaic module (10) and facing the photovoltaic module (10); characterized in that, The light box (710) includes a light box body (712), multiple panel lights (713), multiple diffuser plates (714), and a light shield (715). The multiple panel lights (713) are fixedly separated on one side of the light box body (712). The multiple diffuser plates (714) are fixedly separated on the same side of the light box body (712) and located between and outside the multiple panel lights (713). The light shield (715) is fixed in the middle of the light box body (712) to separate the visual component (720), photovoltaic component (10), and multiple panel lights (713), so that the light from the multiple panel lights (713) reaches the surface of the photovoltaic component (10) through scattering and transmission, avoiding light spot irradiation and thus avoiding image light spots.

2. The photovoltaic module visual inspection mechanism (700) according to claim 1, characterized in that, The lightbox (710) also includes a lightbox frame (711), and the lightbox body (712) is fixed on the lightbox frame (711). The top or bottom surface of the lightbox body (712) is provided with multiple lightbox camera holes (7121) for the vision component (720) to penetrate the lightbox (710) to take pictures.

3. The photovoltaic module visual inspection mechanism (700) according to claim 2, characterized in that, The vision component (720) includes a camera mounting beam (721), multiple appearance inspection units (722), and multiple EL inspection units (723). The camera mounting beam (721) is fixed to the light box frame (711). The multiple appearance inspection units (722) and multiple EL inspection units (723) are all fixed to the camera mounting beam (721). The multiple appearance inspection units (722) and multiple EL inspection units (723) are respectively located in the multiple light box camera holes (7121) and face the photovoltaic module (10).

4. The photovoltaic module visual inspection mechanism (700) according to claim 3, characterized in that, The appearance inspection unit (722) includes an appearance inspection camera mounting plate (7221), an appearance inspection camera (7222), and an appearance inspection lens (7223). The appearance inspection camera mounting plate (7221) is fixed on the camera mounting beam (721), the appearance inspection camera (7222) is fixed on the appearance inspection camera mounting plate (7221), and the appearance inspection lens (7223) is fixed on the appearance inspection camera (7222) and located inside the camera hole (7121) of the light box facing the photovoltaic module (10). It is used to take pictures of local areas of the photovoltaic module (10). Multiple appearance inspection units (722) take pictures of different areas of the photovoltaic module (10) in sections. The background image software then stitches the images of multiple areas into an image of the entire photovoltaic module (10) for appearance inspection.

5. The photovoltaic module visual inspection mechanism (700) according to claim 4, characterized in that, The EL inspection unit (723) includes an EL inspection camera mounting plate (7231), an EL inspection camera (7232), and an EL inspection lens (7233). The EL inspection camera mounting plate (7231) is fixed on the camera mounting beam (721) and located next to the appearance inspection camera mounting plate (7221). The EL inspection camera (7232) is fixed on the EL inspection camera mounting plate (7231). The EL inspection lens (7233) is fixed on the EL inspection camera (7232) and located inside the light box camera hole (7121) facing the photovoltaic module (10). It is used to take pictures of local areas of the photovoltaic module (10). Multiple EL inspection units (723) take pictures of different areas of the photovoltaic module (10) in sections. The background image software then stitches the images of multiple areas into an image of the entire photovoltaic module (10) for EL inspection.

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