Solar cell inspection system

Abstract

The application is suitable for the field of photovoltaic power generation technology, and provides a solar cell detection system; the solar cell detection system comprises a detection station for placing a to-be-detected solar cell, a light shielding box assembled to the detection station, and a first annular light source group and a second annular light source group respectively arranged on the inner circumferential side of the light shielding box; the first annular light source group and the second annular light source group are arranged on the inner circumferential side of the light shielding box, the angle between the light source light rays in the first annular light source group and the surface of the to-be-detected solar cell is designed to be greater than the angle between the light source light rays in the second annular light source group and the surface of the to-be-detected solar cell, so that the composite light source is omnidirectionally and uniformly irradiated on the surface of the to-be-detected solar cell, thereby reducing the direct reflection of the bright medium layer or the strong light reflection layer on the surface of the to-be-detected solar cell, and further improving the ability of the solar cell detection system to detect the small defect features on the surface of the to-be-detected solar cell.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic power generation technology, and in particular relates to a solar cell detection system. Background Technology

[0002] Solar cells have a glossy dielectric layer or a strong light reflective layer printed or sprayed on their surface. However, existing solar cell inspection systems cannot eliminate image distortion caused by specular reflection during the process of capturing solar cell images. As a result, they cannot accurately detect minute defects on the surface of solar cells, leading to the downgrading of solar cells with defects in appearance.

[0003] Therefore, improving the ability of solar cell detection systems to detect minute defects on the surface of solar cells has become an urgent problem to be solved. Utility Model Content

[0004] This application provides a solar cell inspection system, which aims to solve the problem of how to improve the ability of a solar cell inspection system to detect minute defect features on the surface of solar cells.

[0005] The solar cell testing system provided in this application includes: The testing station is used to place the solar cells to be tested. The light-shielding box is assembled into the testing station; The first ring light source group and the second ring light source group are respectively disposed on the inner periphery of the light-shielding box; the angle between the light source light in the first ring light source group and the surface of the solar cell to be tested is greater than the angle between the light source light in the second ring light source group and the surface of the solar cell to be tested.

[0006] Specifically, the first ring light source group includes a plurality of first point light sources, and the angle between the first point light sources and the center of the surface of the solar cell to be tested is 50° to 75°.

[0007] More specifically, the second ring light source group includes a plurality of second point light sources, and the angle between the second point light sources and the center of the surface of the solar cell to be tested is 20° to 45°.

[0008] Specifically, the first ring light source group forms a circular first illumination area; The radius of the first illuminated area is less than 300 mm.

[0009] More specifically, the second ring light source group forms a circular second illumination area; The radius of the second illuminated area is 200mm to 250mm.

[0010] Specifically, the first ring light source group includes a plurality of first point light sources, and the distance between two adjacent first point light sources is 5mm to 10mm.

[0011] More specifically, the second ring light source group includes a plurality of second point light sources, and the distance between two adjacent second point light sources is 5mm to 10mm.

[0012] Specifically, the light source in the first ring light source group is a red light source.

[0013] More specifically, the light source in the second ring light source group is one or more of the following: red light source, green light source, blue light source, RGB three-color light source, and white light source.

[0014] In one specific embodiment, a camera module is also included, and the camera module is mounted on top of the light-shielding box; The top of the light-shielding box has a light-transmitting hole; the camera module captures images of the solar cell under test under the illumination of the first ring light source group and the second ring light source group through the light-transmitting hole.

[0015] Specifically, the first ring light source group and the second ring light source group respectively form a first illumination area and a second illumination area in a circle; The camera module, the through hole, and the first and second illumination areas are coaxially arranged.

[0016] Specifically, the inner surface of the light-shielding box is provided with a diffuse reflection layer.

[0017] Specifically, a whiteboard is arranged on the testing station, and the whiteboard is placed between the testing station and the solar cell to be tested.

[0018] The beneficial effects of this utility model are as follows: by setting a first ring light source group and a second ring light source group at different heights on the inner circumference of the light-shielding box, and designing the angle between the light source of the first ring light source group and the surface of the solar cell to be tested to be greater than the angle between the light source of the second ring light source group and the surface of the solar cell to be tested, the composite light source formed by the first ring light source group and the second ring light source group can illuminate the surface of the solar cell to be tested in an all-round and uniform manner, thereby reducing the direct reflection of the bright dielectric layer or strong light reflective layer on the surface of the solar cell to be tested, and thus improving the ability of the solar cell detection system to detect the small defect features on the surface of the solar cell to be tested. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a solar cell detection system according to one embodiment of this application; Figure 2This is one of the top views of a solar cell detection system according to an embodiment of this application; Figure 3 This is a second top view of a solar cell detection system according to an embodiment of this application; Figure 4 This is a top view of the solar cell detection system according to one embodiment of this application; Figure 5 This is a top view of the solar cell detection system according to one embodiment of this application; Figure 6 This is the fifth top view of a solar cell detection system according to one embodiment of this application.

[0020] Explanation of key component symbols: 1. Solar cell detection system; 10. Imaging equipment; 100. Camera module; 11. First ring light source group; 110. First point light source; 12. Second ring light source group; 120. Second point light source; 13. Light-shielding box; 130. Diffuse reflection layer; 131. First illumination area; 132. Second illumination area; 133. Through hole; 14. White board; 15. Solar cell to be tested; 16. Testing station. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0022] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0023] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] Please refer to Figure 1This application provides a solar cell inspection system 1, mainly used to detect minute defects on the front side of the solar cell under test. For example, it detects whether the surface of the solar cell 15 under test has scratches, whether the isolation protrusions have defects, and whether the film color is abnormal. It should be noted that the isolation protrusions are isolation components, such as isolation films. These components not only discharge gases generated during the solar cell formation process, but specifically, in the structure of a single solar cell, the protrusions on the surface of the isolation component can be arranged according to a decreasing distribution density per unit area. Using the aforementioned design, a pressure difference can be formed inside the electrode assembly, causing the gases generated during solar cell formation to be directionally discharged along the pressure gradient, thereby preventing gas accumulation and bubble formation inside the solar cell, and effectively avoiding problems such as black spots and lithium plating after solar cell formation. Furthermore, it can enhance light absorption and photoelectric conversion efficiency. Specifically, since most light rays pass through the isolation protrusions on the surface of the solar cell under test and are absorbed by the solar cell 15, a small portion of the light is repeatedly refracted or reflected by several isolation protrusions and then absorbed again by the solar cell 15, thus forming a light-trapping effect on the isolation protrusions to improve the photoelectric conversion efficiency of the solar cell 15 under test. Of course, in other specific embodiments, the solar cell detection system 1 can also be used to detect other defect features on the surface of the solar cell 15 to be tested, and no specific limitations are made here.

[0028] In some embodiments, the solar cell testing system 1 includes a testing station 16 for placing the solar cell 15 to be tested, a light-shielding box 13 covering the testing station 16, and a first annular light source group 11 and a second annular light source group 12 respectively disposed on the inner periphery of the light-shielding box 13, wherein the angle between the light source light in the first annular light source group 11 and the surface of the solar cell 15 to be tested is greater than the angle between the light source light in the second annular light source group 12 and the surface of the solar cell 15 to be tested.

[0029] Thus, a composite light source is formed by the high-angle first ring light source group 11 and the low-angle second ring light source group 12, and the light from the aforementioned composite light source is uniformly and omnidirectionally irradiated on the surface of the solar cell 15 to be tested, thereby improving the ability of the solar cell detection system 1 to detect minute defect features on the surface of the solar cell 15 to be tested.

[0030] It should be noted that here, "high angle" and "low angle" refer to the fact that the height of the plane where the first ring light source group 11 is located from the bottom of the light shield box 13 is greater than the height of the plane where the second ring light source group 12 is located from the bottom of the light shield box 13.

[0031] Specifically, the aforementioned testing station 16 can be a platform surface used to support the solar cell testing system 1 and place the solar cell 15 to be tested. It is understood that the shape of the projected image of the light-shielding box 13 on the testing station 16 can be circular or near-circular, thereby ensuring light uniformity while matching the shape of the light-shielding box 13 with the shape of the light source and the lens in the camera module 100. For example, the shape of the light-shielding box 13 can be spherical, hemispherical, near-hemispherical, or bowl-shaped.

[0032] The first annular light source group 11 includes multiple first light sources, and the first annular light source group 11 is formed by arranging the multiple first light sources in a circular array. The second annular light source group 12 includes multiple second light sources, and the second annular light source group 12 is formed by arranging the multiple second light sources in a circular array. Thus, by designing the angle between the light emitted by each first light source in the first annular light source group 11 and the surface of the solar cell 15 to be tested to be greater than the angle between the light emitted by each second light source in the second annular light source group 12 and the surface of the solar cell 15 to be tested, that is, on the light shielding box 13, the plane where the first annular light source group 11 is located is higher than the plane where the second annular light source group 12 is located, so that the light emitted by the first annular light source group 11 and the second annular light source group 12 can respectively illuminate different parts of the solar cell 15 to be tested, thereby achieving omnidirectional and uniform illumination of the surface of the solar cell 15 to be tested by the aforementioned composite light source.

[0033] In this specific embodiment, the solar cell detection system 1 may include a high-angle first ring light source group 11 and a low-angle second ring light source group 12. In other specific embodiments, the solar cell detection system 1 may also include a medium-angle third ring light source group; no specific limitation is made here. It is understood that the first ring light source group 11 and the second ring light source group 12 may also be integrated into the same illumination module in the solar cell detection system 1, and the angle between the first light source light in the first ring light source group 11 and the surface of the solar cell 15 to be tested, and the angle between the second light source light in the second ring light source group 12 and the surface of the solar cell 15 to be tested may be adjusted by the adjustment mechanism in the solar cell detection system to meet the detection requirements of solar cells 15 of different specifications. Furthermore, the number of first light sources in the first ring light source group 11 and / or the number of second light sources in the second ring light source group 12 that are in the on state may be controlled by the control module in the solar cell detection system 1 to adapt to different lighting scenarios.

[0034] It should be noted that the purpose of designing the high-angle first ring light source group 11 and the low-angle second ring light source group 12 is, on the one hand, to form the aforementioned composite light source, and on the other hand, the first ring light source group 11 and the second ring light source group 12 can assist in detecting different types of defect features. The types of defect features detected by the first ring light source group 11 and the second ring light source group 12 will be described in detail below.

[0035] The high-angle first ring light source is also used to detect large-area and deep defects on the surface of the solar cell 15 under test. Specifically, it is used to detect whether the isolation protrusions on the surface of the solar cell 15 have gaps, cracks, or are completely missing; whether the color distribution is uniform; whether the coating thickness is consistent; and whether there are hidden cracks, damage, or welding abnormalities on the surface of the solar cell. For example, the high-angle first ring light source group 11 illuminates the surface of the solar cell 15 under test at an angle to enhance the three-dimensionality of the isolation protrusions on the surface of the solar cell 15 under test, thereby creating a clear contrast between the edges of the isolation protrusions and the surface of the solar cell 15 under test, which facilitates the detection of defects such as insufficient height, breakage, or roughness of the isolation protrusions.

[0036] The low-angle second ring light source group 12 is used to detect minute defect features on the surface of the solar cell, such as whether it has scratches, surface texture, and edge defects. Specifically, scratch defects include surface scratches caused by friction between the solar cell and equipment (e.g., cutting machine, conveyor belt) during cutting, handling, or testing.

[0037] In some embodiments, the first annular light source group 11 includes a plurality of first point light sources 110, and the angle between the first point light source 110 and the center of the surface of the solar cell 15 to be tested is 50° to 75°. For example, the angle between the light from the first point light source 10 and the surface of the solar cell 15 to be tested can be 50°, 55°, 60°, 65°, 70°, 75°, etc. Of course, the angle between the light from the first point light source 10 and the surface of the solar cell 15 to be tested is not limited to the aforementioned values.

[0038] Thus, based on the principle of bright field illumination, the high-angle first ring light source group 11 provides uniform illumination to the solar cell 15 under test, thereby enhancing the overall contrast of the surface of the solar cell 15 under test, which facilitates the detection of large-area and deep defect features, such as black spots.

[0039] In some embodiments, the second ring light source group 12 includes a plurality of second point light sources 120, and the angle between the second point light sources 120 and the center of the surface of the solar cell 15 to be tested is 20° to 45°. For example, the angle between the light from the second point light source 120 and the surface of the solar cell 15 to be tested can be 20°, 25°, 30°, 35°, 40°, and 45°, etc. Of course, the angle between the light from the second point light source 120 and the surface of the solar cell 15 to be tested is not limited to the aforementioned values.

[0040] Thus, based on the principle of dark field illumination, the lens in the camera module 100 can avoid the reflected light from the surface of the solar cell 15 to be tested under the illumination of the second ring light source group 12 at a low angle, and only capture the scattered light from the defect location on the surface of the solar cell 15 to be tested, thereby highlighting the micro-defect features such as microcracks and scratches on the surface of the solar cell 15 to be tested.

[0041] In some embodiments, the first annular light source group 11 encloses a circular first illumination region 131; the radius of the first illumination region 131 is 250mm to 300mm. For example, the radius of the first illumination region 131 can be 250mm, 255mm, 260mm, 265mm, 270mm, 275mm, 280mm, 285mm, 290mm, and 300mm. Of course, the radius of the first illumination region 131 is not limited to the aforementioned values.

[0042] In this way, the first illumination area 131 completely covers the solar cell 15 to be tested, so as to prevent the light of the first illumination area 131 from being blocked by the solar cell 15 to be tested, thereby forming a detection blind zone on the surface of the solar cell 15 to be tested, and at the same time avoiding physical interference between the first ring light source group 11, the camera module 100 and the solar cell 15 to be tested.

[0043] In some embodiments, the second ring light source group 12 encloses a circular second illumination area 132; the radius of the second illumination area 132 is 200mm to 250mm. For example, the radius of the second illumination area 132 can be 200mm, 205mm, 210mm, 215mm, 220mm, 225mm, 230mm, 235mm, 240mm, 245mm, and 250mm, etc. Of course, in other specific embodiments, the radius of the second illumination area 132 is not limited to the aforementioned values.

[0044] In this way, the first illumination area 131 completely covers the solar cell 15 to be tested, so as to prevent the light of the second illumination area 132 from being blocked by the solar cell 15 to be tested, thereby forming a detection blind zone on the surface of the solar cell 15 to be tested, and at the same time avoiding physical interference between the second ring light source group 12, the camera module 100 and the solar cell 15 to be tested.

[0045] In some embodiments, the first annular light source group 11 includes a plurality of first point light sources 110, and the distance between two adjacent first point light sources 110 is 5mm to 10mm, thereby making the illumination more uniform. For example, the distance between two adjacent first point light sources 110 can be 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm, etc.

[0046] In some embodiments, the second ring light source group 12 includes a plurality of second point light sources 120, and the distance between two adjacent second point light sources 120 is 5mm to 10mm, thereby making the illumination more uniform. For example, the distance between two adjacent second point light sources 120 can be 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm, etc. It should be noted that the distance between two adjacent second point light sources 120 can be the same as or different from the distance between two adjacent first point light sources 110.

[0047] In some implementations, reference Figures 2-6 The first ring light source group 11 includes multiple first point light sources 110, and the first point light sources 110 are red light sources.

[0048] Thus, because the red light source has stronger penetrability, it can partially penetrate the antireflection film and passivation layer on the surface of the solar cell 15 to be tested and reflect the internal structure of the solar cell 15 to be tested, thereby revealing deep defect features such as hidden cracks and black spots on the image captured by the first point light source 110 that uses the red light source to assist the camera module 100.

[0049] In some embodiments, the second ring light source group 12 includes a plurality of second point light sources 120, and the second point light sources 120 are one or more of red light sources, green light sources, blue light sources, RGB three-color light sources and white light sources.

[0050] Thus, in the process of detecting defect features of the solar cell 15 under test by the solar cell detection system 1, different colors of light sources (each color has a different wavelength) leverage their respective advantages. Specifically, the green light source has a moderate wavelength, which can balance and meet the detection requirements of surface, shallow, and even medium-depth defect features of the solar cell 15 under test; the blue light source has a shorter wavelength, which can highlight the small defect features (e.g., nanoscale scratches) on the solar cell 15 under test, thereby improving the ability of the solar cell detection system 1 to detect small defect features on the solar cell 15 under test; the white light source includes multiple wavelengths such as red, green, and blue, which can meet the detection requirements of different types of defect features on the solar cell 15 under test, thus giving the solar cell detection system 1 a certain degree of versatility.

[0051] In some embodiments, the solar cell inspection system 1 further includes an imaging device 10, which is mounted above the light-shielding box 13 and includes a camera module 100. The top of the light-shielding box 13 has a through hole 133 (i.e., the entrance light hole of the lens in the camera module 100). The camera module 100 captures images of the solar cell 15 to be inspected under the illumination of the first ring light source group 11 and the second ring light source group 12 through the through hole 133, and identifies the defect features on the surface of the solar cell 15 to be inspected based on the captured images, and then classifies and repairs the aforementioned defect features.

[0052] In some embodiments, the first ring light source group 11 and the second ring light source group 12 respectively form a circular first illumination area 131 and a circular second illumination area 132; the lens and through-hole 133 of the camera module 100 are coaxially arranged with the first illumination area 131 and the second illumination area 132. The purpose of the aforementioned design is not only to make the components in the solar cell detection system 1 compact, but also to prevent reflected light from the surface of the solar cell 15 to be detected from directly entering the lens of the camera module 100, so as to avoid glare and halo phenomena, thereby improving the contrast of the image of the solar cell 15 to be detected captured by the camera module 100, that is, to highlight the surface defects such as scratches and cracks of the solar cell 15 to be detected. Furthermore, by coaxially arranging the lens and through-hole 133 of the camera module 100 with the first illumination area 131 and the second illumination area 132, the light from the first light source 110 and / or the second light source 120 can be uniformly irradiated onto the surface of the solar cell 15 to be tested at a specific angle. This reduces or even avoids the shadows cast on the surface of the solar cell 15 to be tested under the illumination of the first light source 110 and / or the second light source 120 due to the non-coaxial arrangement of the lens and through-hole 133 of the camera module 100 with the first illumination area 131 and the second illumination area 132. As a result, the defect features of the isolated protrusion and the defect features of the surface of the solar cell 15 to be tested are clearly presented in the aforementioned captured image.

[0053] In some embodiments, the inner surface of the light-shielding box 13 is provided with a diffuse reflection layer 130.

[0054] In this way, the diffuse reflection layer 130 is used to convert the aforementioned first point light source 110 and second point light source 120 into surface light sources and to distribute the light from the aforementioned light sources evenly on the surface of the solar cell 15 to be tested, thereby ensuring that the illumination obtained by each area on the solar cell 15 to be tested is consistent.

[0055] Specifically, a diffuse reflection layer 130 can be formed on the inner surface of the light-shielding box 13 by coating. The purpose of this design is that, since the surface of the solar cell 15 to be tested is provided with an anti-reflection film, it is prone to specular reflection under the illumination of light source, which can cause strong light spots or glare in the image captured by the camera module 100 in the above embodiment, thus obscuring the minor defect features (e.g., scratches, microcracks, etc.) on the surface of the solar cell 15 to be tested. Therefore, by coating the inner surface of the light-shielding box 13 with a diffuse reflection layer 130 (e.g., a diffuse reflection coating), the incident light emitted by the first ring light source group 11 and the second ring light source group 12 can be uniformly irradiated onto the surface of the solar cell 15 to be tested from all directions, so as to avoid the aforementioned light being concentrated and reflected into the lens of the camera module 100, thereby eliminating the interference of specular reflection on the surface of the solar cell 15 to be tested, and making the minor defect features of the solar cell 15 to be tested clearer.

[0056] In some embodiments, a white board 14 is arranged on the inspection station 16, and the white board 14 is positioned between the inspection station 16 and the solar cell to be inspected. The purpose of this design is twofold: firstly, the white board 14 calibrates the intensity of the aforementioned light source and the exposure parameters of the camera module 100, eliminating interference from light source fluctuations and gain differences in the camera module 100, thereby ensuring the comparability of inspection results for different batches of the same solar cell 15; secondly, the white board 14, as a pure white reference background, creates a high-contrast dark environment on the side of the solar cell 15 near the inspection station 16. When defects (e.g., microcracks) exist on the surface of the solar cell 15, dark spots appear in the defective areas due to differences in light absorption or scattering, forming a strong contrast with the pure white reference background of the white board 14, thus facilitating the camera module 100 to capture minute defect features. In other words, the white board 14 enhances the surface defect features of the solar cell 15 to be inspected.

[0057] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is 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.

[0058] Furthermore, the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A solar cell detection system, characterized in that, include: The testing station is used to place the solar cells to be tested. A light-shielding box is installed over the testing station; Both the first and second annular light source groups are located on the inner periphery of the light-shielding box; The angle between the light source rays in the first ring light source group and the surface of the solar cell to be tested is greater than the angle between the light source rays in the second ring light source group and the surface of the solar cell to be tested.

2. The solar cell detection system according to claim 1, characterized in that, The first ring light source group includes a plurality of first point light sources, and the angle between the first point light sources and the center of the surface of the solar cell to be tested is 50° to 75°.

3. The solar cell detection system according to claim 1, characterized in that, The second ring light source group includes a plurality of second point light sources, and the angle between the second point light sources and the center of the surface of the solar cell to be tested is 20° to 45°.

4. The solar cell detection system according to claim 1, characterized in that, The first ring light source group forms a circular first illumination area; The radius of the first illuminated area is 250mm to 300mm.

5. The solar cell detection system according to claim 1, characterized in that, The second ring light source group forms a circular second illumination area; The radius of the second illuminated area is 200mm to 250mm.

6. The solar cell detection system according to claim 1, characterized in that, The first ring light source group includes multiple first point light sources, and the distance between two adjacent first point light sources is 5mm to 10mm.

7. The solar cell detection system according to claim 1, characterized in that, The second ring light source group includes multiple second point light sources, and the distance between two adjacent second point light sources is 5mm to 10mm.

8. The solar cell detection system according to claim 1, characterized in that, The first ring light source group includes multiple first point light sources, and the first point light sources are red light sources.

9. The solar cell detection system according to claim 1, characterized in that, The second ring light source group includes multiple second point light sources, and the second point light sources are one or more of the following: red light source, green light source, blue light source, RGB three-color light source, and white light source.

10. The solar cell detection system according to claim 1, characterized in that, It also includes a camera module, which is mounted on top of the light-shielding box; The top of the light-shielding box has a light-transmitting hole; The camera module captures images of the solar cell under test under the illumination of the first ring light source group and the second ring light source group through the light-transmitting aperture.

11. The solar cell detection system according to claim 10, characterized in that, The first ring light source group and the second ring light source group respectively form a first circular illumination area and a second circular illumination area; The camera module, the through hole, and the first and second illumination areas are coaxially arranged.

12. The solar cell detection system according to any one of claims 1-11, characterized in that, The inner surface of the light-shielding box is provided with a diffuse reflection layer.

13. The solar cell detection system according to any one of claims 1-11, characterized in that, A whiteboard is arranged on the testing station, and the whiteboard is placed between the testing station and the solar cell to be tested.

Images