An EL and PL based solar cell defect detection device

Abstract

The utility model relates to a solar cell piece defect detection device, especially a solar cell piece defect detection device based on EL and PL, include: transmission subassembly is used for conveying cell piece, camera subassembly includes the K line array camera for gathering EL image and the K line array camera for gathering PL image, locates transmission subassembly's top, laser assembly is used for providing the light source for K line array camera, LED light source subassembly is used for providing the light source for K line array camera, light shield board subassembly locates transmission subassembly's top, and is located between laser assembly and LED light source subassembly, and industrial computer is connected with transmission subassembly, K line array camera, K line array camera, laser assembly and LED light source subassembly respectively.A kind of solar cell piece defect detection device based on EL and PL can realize EL detection and PL detection on the same device, greatly reduce the investment cost of equipment, and only need once detection to complete EL detection and PL detection, and detection efficiency is high.

Description

Technical Field

[0001] This utility model relates to a solar cell defect detection device, and more particularly to a solar cell defect detection device based on EL and PL. Background Technology

[0002] In the photovoltaic industry, solar cells are the core component of photovoltaic modules, and their production quality directly affects the performance and efficiency of the modules. During the production process of solar cells, different steps can cause defects such as microcracks, concentric circles, and contamination in the cells. The presence of these defects can lead to reduced photoelectric conversion efficiency at the module end and an increase in defective modules.

[0003] Currently, electroluminescence and photoluminescence are two widely used defect detection methods. Electroluminescence, abbreviated as EL, involves applying current to make the battery cell emit light, capturing the image with an infrared camera, and identifying defects by analyzing brightness differences. However, this method cannot achieve completely real-time online detection because the probe pressure can cause secondary damage to the battery. It can identify defects such as broken grids and spur marks. Photoluminescence, abbreviated as PL, involves using a laser to make the battery emit light, capturing the luminescent image with a high-sensitivity camera, and identifying defects by analyzing the luminescence intensity distribution. This method is a non-contact detection method with high sensitivity and can identify defects such as scratches and dirt.

[0004] EL testing equipment can only perform EL testing, and PL testing equipment can only perform PL testing. When both EL and PL testing are required at the same time, they can only be performed separately by the EL testing equipment and the PL testing equipment, which requires two devices, resulting in high equipment investment and two testing processes, and the testing efficiency is also low. Utility Model Content

[0005] To address the issues of low detection efficiency and high equipment investment costs resulting from the need for two inspections, this utility model provides a solar cell defect detection device based on EL and PL, the specific technical solution of which is as follows:

[0006] A solar cell defect detection device based on EL and PL includes: a transmission component for transporting solar cells; a camera component including a K-line array camera for acquiring EL images and a K-line array camera for acquiring PL images, disposed above the transmission component; a laser component for providing a light source for the K-line array cameras; an LED light source component for providing a light source for the K-line array cameras; a light-shielding plate component disposed above the transmission component and between the laser component and the LED light source component; and an industrial control computer connected to the transmission component, the K-line array cameras, the laser component, and the LED light source component.

[0007] Preferably, the camera assembly further includes: a camera mounting plate disposed on the transmission assembly; a first angle adjuster disposed on the camera mounting plate; the first mounting plate being connected to the K-line scan camera and the first angle adjuster respectively; a second angle adjuster disposed on the camera mounting plate; and a second mounting plate being connected to the K-line scan camera and the second angle adjuster respectively.

[0008] Preferably, it further includes: a first lens, mounted on a K-line array camera; a second lens, mounted on a K-line array camera; and filters, respectively mounted on the first lens and the second lens.

[0009] Preferably, the laser assembly includes: a third angle adjuster disposed on the transmission assembly; a third fixing plate disposed on the third angle adjuster; an infrared laser source disposed on the third fixing plate, wherein the illumination position of the infrared laser source is concentrically set with the shooting position of the K-line array camera; and a laser controller connected to the industrial control computer and the infrared laser source respectively.

[0010] Preferably, the LED light source assembly includes: an LED light source; a first right-angle bracket disposed on one side of the LED light source; and a second right-angle bracket disposed on the other side of the LED light source; wherein the first right-angle bracket and the second right-angle bracket are both disposed on the transmission assembly.

[0011] Preferably, the light-shielding plate assembly includes: a first light-shielding plate, a second light-shielding plate, a third right-angle bracket, a fourth right-angle bracket, a fifth right-angle bracket, and a sixth right-angle bracket; the first light-shielding plate and the second light-shielding plate are arranged in parallel and perpendicular to the surface of the solar cell; one end of the first light-shielding plate is connected to the third right-angle bracket, and the other end of the first light-shielding plate is connected to the fourth right-angle bracket; one end of the second light-shielding plate is connected to the fifth right-angle bracket, and the other end of the second light-shielding plate is connected to the sixth right-angle bracket; the third right-angle bracket, the fifth right-angle bracket, the fourth right-angle bracket, and the sixth right-angle bracket are all disposed on the transmission assembly.

[0012] Preferably, it also includes: a mounting bracket, which is connected to the transmission component, camera component, laser component, LED light source component and light shield component respectively.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention provides a solar cell defect detection device based on EL and PL, which can realize EL detection and PL detection on the same device, greatly reducing the investment cost of the equipment, and EL detection and PL detection can be completed in only one detection, with high detection efficiency.

[0015] It features two independent inspection modes, EL and PL, allowing a single station to detect more defects and shorten the testing cycle of EL at the PL station, enabling online inspection and improving the level of automation. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of this application;

[0017] Figure 2 This is an assembly diagram of the LED light source assembly and the light shield assembly;

[0018] In the diagram: 11. 1K line scan camera; 12. First mounting plate; 13. First angle adjuster; 14. 4K line scan camera; 15. Second mounting plate; 16. Second angle adjuster; 17. Camera mounting plate; 21. First lens; 22. Second lens; 31. Infrared laser light source; 32. Third mounting plate; 33. Third angle adjuster; 34. Laser controller; 41. LED light source; 42. First right-angle bracket; 43. Second right-angle bracket; 51. First shield. 52. Light-shielding plate; 53. Third right-angle bracket; 54. Fourth right-angle bracket; 55. Fifth right-angle bracket; 56. Sixth right-angle bracket; 61. Conveyor belt; 71. First mounting bracket; 72. Second mounting bracket; 73. Third mounting bracket; 74. Fourth mounting bracket; 75. Fifth mounting bracket; 76. Sixth mounting bracket; 77. Seventh mounting bracket; 78. Eighth mounting bracket; 79. Ninth mounting bracket; 81. Industrial control computer; 91. Battery cell. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings.

[0020] like Figure 1 and Figure 2 As shown, a solar cell defect detection device based on EL and PL includes a camera assembly, a laser assembly, an LED light source assembly, a light shield assembly, a mounting bracket, a transmission assembly, and an industrial control computer.

[0021] The mounting brackets include a first mounting bracket 1, a second mounting bracket 2, a third mounting bracket 3, a fourth mounting bracket 4, a fifth mounting bracket 5, a sixth mounting bracket 6, a seventh mounting bracket 7, an eighth mounting bracket 8, and a ninth mounting bracket 9. Mounting brackets 1 to 75 form a gantry-type mounting structure. Each component is mounted on the mounting bracket, and the components on the mounting brackets, from top to bottom, are: camera component, lens component, laser component, light shield component, LED light source component, and transmission component.

[0022] The light-shielding plate assembly includes a first light-shielding plate 51, a second light-shielding plate 52, a third right-angle bracket 53, a fourth right-angle bracket 54, a fifth right-angle bracket 55, and a sixth right-angle bracket 56. The first light-shielding plate 51 and the second light-shielding plate 52 are parallel to each other and perpendicular to the horizontal surface of the solar cell. One end of the first light-shielding plate 51 is connected to the third right-angle bracket 53, and the other end is connected to the fourth right-angle bracket 54. One end of the second light-shielding plate 52 is connected to the fifth right-angle bracket 55, and the other end is connected to the sixth right-angle bracket 56. The other side of the third right-angle bracket 53 and the fifth right-angle bracket 55 are both connected to the mounting bracket 8, and the other side of the fourth right-angle bracket 54 and the sixth right-angle bracket 56 are both connected to the mounting bracket 9.

[0023] The transmission assembly includes a conveyor belt 61 and a conveyor belt controller. The solar cells are placed horizontally on the conveyor belt, and the conveyor belt controller controls the speed and direction of the conveyor belt.

[0024] The industrial control computer 81 includes a control module and an image processing module. The control module manages the signal transmission of the laser, LED light source, camera and conveyor belt. When the battery cell 91 completes the previous process, namely the feeding process, the industrial control computer will transmit the start signal to the laser controller, LED light source and two line scan cameras to control them to turn on. First, the PL image is acquired, then the EL image is acquired. After the acquisition is completed, the industrial control computer controls them to turn off.

[0025] The function of the image processing module is to first detect defects in the acquired PL image, then detect defects in the acquired EL image, and finally determine the defect category of the battery cell according to the priority of different types of defects. After analysis by the image processing module, normal and defective battery cells are distinguished, and then the cells enter the next process, namely the unloading process.

[0026] The camera assembly includes a 1K line scan camera 11, a first fixing plate 12, a first angle adjuster 13, a 4K line scan camera 14, a second fixing plate 15, a second angle adjuster 16, and a camera fixing plate 17. The side of the 1K line scan camera 11 is mounted on the first fixing plate 12. The first angle adjuster 13 is provided with a right-angle bracket, with one side of the adjustable angle perpendicularly connected to the first fixing plate 12 and the other side perpendicularly mounted on the camera fixing plate 17.

[0027] The 1K line scan camera 11 is used to capture images of the EL. Its shooting range is the internal area formed by two light-blocking plates, and its angle is adjusted to be perpendicular to the horizontal surface of the battery cell.

[0028] The 4K line scan camera 14 is mounted on the side of the second fixed plate 15. The second angle adjuster 16 is equipped with a right-angle bracket. One side of the adjustable angle is vertically connected to the second fixed plate 15, and the other side is vertically mounted on the camera fixed plate 17. The 4K line scan camera 14 is used to acquire images of the PL. Its angle can be adjusted to capture the entire range of the battery cell. Its shooting range is the external area formed by the two light shields.

[0029] The camera mounting plate 17 is connected to the mounting bracket 1. The height of the camera mounting plate 17 is adjusted according to the size of the solar cell, the parameters of the line array camera, and the focal length of the lens. The main control parameters of the line array camera include line height, line frequency, exposure time, and gain. The width of the solar cell remains constant without adjusting the camera mounting height. The length of the solar cell varies with the speed of the conveyor belt and the line frequency.

[0030] The top of the first lens 21 is connected to the 1K line scan camera 11, and the bottom of the first lens 21 is connected to a filter. The top of the second lens 22 is connected to the 4K line scan camera 14, and the bottom of the second lens 22 is connected to a filter. The filter can eliminate other light interference and improve image quality.

[0031] The laser assembly includes an infrared laser source 31, a third fixing plate 32, a third angle adjuster 33, and a laser controller 34. The side of the infrared laser source 31 is mounted on the third fixing plate 32. The third angle adjuster 33 is provided with a right-angle bracket. One side of the adjustable angle is perpendicularly connected to the third fixing plate 32, and the other side is perpendicularly mounted on the mounting bracket 6.

[0032] Generally, the illumination position of the infrared laser source 31 is consistent with the optical center of the 1K line scan camera 11, that is, the illumination position of the infrared laser source 31 is exactly below the 1K line scan camera 11, near the outside of the light shield. The installation height of the infrared laser source is generally inconsistent with the height of the line scan camera. After the line scan camera is installed, the laser controller and camera software are turned on, and the laser installation height is adjusted according to the imaging of the camera software.

[0033] The laser controller 34 is connected to the infrared laser source 31 and the industrial computer, and can control the infrared laser source 31 to turn on, turn off, power percentage, trigger mode, delay interval and light emission duration.

[0034] The LED light source assembly includes an LED light source 41, a first right-angle bracket 42, and a second right-angle bracket 43. One side of the LED light source is connected to the first right-angle bracket 42, and the other side is connected to the second right-angle bracket 43. The other side of both right-angle brackets is connected to the mounting bracket 7. Their angles are adjusted to be perpendicular to the horizontal surface of the battery cell, and their height is lower than the height of the infrared laser light source.

[0035] The beneficial effects of this utility model are:

[0036] The use of line scanning and the gantry-type installation structure saves workstations;

[0037] The non-contact design reduces secondary damage to the battery caused by probe pressure.

[0038] There is no obstruction when scanning solar cells, thus reducing the number of defects missed due to probe obstruction;

[0039] The testing actions follow the automated transmission rhythm, thereby reducing time consumption;

[0040] A single output of EL and PL images of the solar cell makes it easier to see whether the defect is on the surface or inside the cell.

[0041] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. A defect detection device for solar cells based on EL and PL, characterized in that, include: Transmission components are used to transport solar cells; The camera assembly, including a 1K line scan camera (11) for acquiring EL images and a 4K line scan camera (14) for acquiring PL images, is positioned above the transmission assembly; A laser assembly for providing a light source for the 1K line array camera (11); LED light source assembly for providing light source for the 4K line scan camera (14); A light-shielding assembly is disposed above the transmission assembly and between the laser assembly and the LED light source assembly; and The industrial control computer is connected to the transmission component, the 1K line scan camera (11), the 4K line scan camera (14), the laser component, and the LED light source component, respectively.

2. The solar cell defect detection device based on EL and PL according to claim 1, characterized in that, The camera assembly also includes: A camera mounting plate (17) is disposed on the transmission component; The first angle adjuster (13) is provided on the camera mounting plate (17); The first fixing plate (12) is connected to the 1K line array camera (11) and the first angle adjuster (13) respectively; The second angle adjuster (16) is disposed on the camera mounting plate (17); and The second fixing plate (15) is connected to the 4K line scan camera (14) and the second angle adjuster (16) respectively.

3. The solar cell defect detection device based on EL and PL according to claim 1, characterized in that, Also includes: The first lens (21) is mounted on the 1K line array camera (11); The second lens (22) is mounted on the 4K line scan camera (14); and The filters are respectively disposed on the first lens (21) and the second lens (22).

4. The solar cell defect detection device based on EL and PL according to claim 1, characterized in that, The laser component includes: A third angle adjuster (33) is provided on the transmission component; The third fixing plate (32) is disposed on the third angle adjuster (33); An infrared laser source (31) is mounted on the third fixed plate (32), and the illumination position of the infrared laser source (31) is concentrically set with the shooting position of the 1K line array camera (11); and The laser controller (34) is connected to the industrial computer and the infrared laser source (31) respectively.

5. The solar cell defect detection device based on EL and PL according to claim 1, characterized in that, The LED light source assembly includes: LED light source (41); The first right-angle bracket (42) is located on one side of the LED light source (41); and The second right-angle bracket (43) is located on the other side of the LED light source (41); The first right-angle bracket (42) and the second right-angle bracket (43) are both mounted on the transmission component.

6. The solar cell defect detection device based on EL and PL according to claim 1, characterized in that, The light-shielding plate assembly includes: a first light-shielding plate (51), a second light-shielding plate (52), a third right-angle bracket (53), a fourth right-angle bracket (54), a fifth right-angle bracket (55), and a sixth right-angle bracket (56). The first light-shielding plate (51) and the second light-shielding plate (52) are arranged in parallel and perpendicular to the surface of the battery cell; One end of the first light-shielding plate (51) is connected to the third right-angle bracket (53), and the other end of the first light-shielding plate (51) is connected to the fourth right-angle bracket (54); One end of the second light-shielding plate (52) is connected to the fifth right-angle bracket (55), and the other end of the second light-shielding plate (52) is connected to the sixth right-angle bracket (56); The third right-angle bracket (53), the fifth right-angle bracket (55), the fourth right-angle bracket (54), and the sixth right-angle bracket (56) are all mounted on the transmission component.

7. The solar cell defect detection device based on EL and PL according to claim 1, characterized in that, Also includes: The mounting bracket is connected to the transmission component, camera component, laser component, LED light source component, and light shield component, respectively.

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