Photovoltaic module EL detection system and test method thereof

Abstract

The present invention relates to a photovoltaic module EL detection system and a test method thereof, belonging to the field of photovoltaic module manufacturing technology, and solving the problem that the EL detection system in the prior art cannot continuously test photovoltaic modules of different sizes, and that manual adjustment of the EL camera leads to poor EL images. The present invention comprises an EL test unit (10) and a measuring unit (40), wherein the measuring unit (40) is used to obtain the length of a test piece (50), and the EL test unit (10) comprises an EL camera (13) and a PC control unit (14), wherein the PC control unit (14) adjusts the position of the EL camera (13) according to the length of the test piece (50). The present invention automatically adjusts the position of the EL camera by obtaining the length of the test piece, and can continuously test photovoltaic modules of different sizes without manually adjusting the position of the EL camera, while avoiding the situation where poor EL images are caused by inaccurate manual adjustment of the position of the EL camera.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic module manufacturing, and in particular to a photovoltaic module EL detection system and a testing method thereof. Background Art

[0002] After the lamination process or the frame assembly process of the photovoltaic module is completed, the photovoltaic module needs to be tested. Usually, an EL (Electro Luminescence) tester is used to detect problems on the cells in the photovoltaic module that are difficult or even impossible to find with the naked eye, such as hidden cracks, broken pieces, black core pieces, broken wires, perforations, edge overcuts, main grid leakage, secondary grid leakage, boundary leakage, sintering defects, cold soldering or over-soldering, etc.; EL test is electroluminescence defect detection, and its principle is: a forward bias voltage is added to the outside of the photovoltaic module, and the power supply injects a large number of unbalanced carriers into the photovoltaic module. Electroluminescence relies on the large number of unbalanced carriers injected from the diffusion area to continuously recombine and emit photons; then a CCD camera is used to capture these photons, and they are displayed after being processed by a computer.

[0003] As the size of photovoltaic modules becomes larger and larger and the latest national standard for EL detection (EL detection standard 0.5mm / pixel) is announced, the current single-camera EL tester in the industry basically cannot meet the requirements of the latest national standard. In order to meet the national standard for EL detection, the current EL tester basically adopts the principle of multiple EL cameras (CCD cameras) multiple imaging detection (for example: 4 EL cameras shoot, the module moves three times for imaging, which is equivalent to using 12 EL cameras for imaging) to achieve full-screen EL clarity that meets the latest international standards.

[0004] Although the increase in the number of EL cameras in the EL tester can effectively solve the problem of clarity, when testing photovoltaic modules of different sizes, due to the large number of EL cameras, the adjustment of the shooting position of the EL camera each time becomes very cumbersome; at the same time, because multiple cameras and multiple imaging belong to the puzzle technology, once the shooting position adjustment of a certain EL camera deviates, it will affect the imaging effect of the EL tester.

[0005] At present, there is an urgent need for a test system and a test method that can quickly perform EL testing on photovoltaic modules of different sizes to solve the above problems. Summary of the invention

[0006] In view of the above analysis, the embodiments of the present invention aim to provide a photovoltaic module EL detection system and a test method thereof, so as to solve the problem that the existing EL detection system cannot continuously test photovoltaic modules of different sizes and the manual adjustment of the EL camera leads to poor EL images.

[0007] On the one hand, the present invention provides a photovoltaic module EL detection system, including an EL test unit and a measuring unit, the measuring unit is used to obtain the length of the test piece, the EL test unit includes an EL camera and a PC control unit, the PC control unit adjusts the position of the EL camera according to the length of the test piece.

[0008] Furthermore, the EL test unit also includes an EL test main cabinet and a horizontal transmission mechanism, and the horizontal transmission mechanism is arranged in the EL test main cabinet.

[0009] Furthermore, the EL camera is arranged below the horizontal transmission mechanism.

[0010] Furthermore, the EL test main cabinet is provided with loading and unloading ports for the test pieces to pass through.

[0011] Furthermore, it also includes a loading and unloading unit, and the horizontal height of the loading and unloading unit is consistent with the horizontal height of the loading and unloading port.

[0012] Furthermore, the loading and unloading unit includes a loading and unloading bracket and a loading and unloading horizontal conveying mechanism. The loading and unloading bracket is arranged opposite to the loading and unloading port, and the loading and unloading horizontal conveying mechanism is arranged on the loading and unloading bracket.

[0013] Furthermore, it also includes a driving component, which is connected to the PC control unit and controls the movement of the horizontal conveying mechanism, the loading and unloading horizontal conveying mechanism and the EL camera.

[0014] Furthermore, the measuring unit is arranged on the loading and unloading unit.

[0015] Furthermore, the horizontal height of the measuring unit is higher than the contact surface between the loading and unloading horizontal conveying mechanism and the piece to be tested.

[0016] Furthermore, the top of the horizontal conveying mechanism is flush with the top of the loading and unloading horizontal conveying mechanism.

[0017] On the other hand, the present invention provides a photovoltaic module EL testing method, using the photovoltaic module EL detection system, the steps comprising:

[0018] S1: Get the length of the test piece;

[0019] S2: The PC control unit adjusts the position of the EL camera according to the length of the test piece;

[0020] S3: The test piece is moved to the shooting area after the EL camera is adjusted for testing to obtain an EL image.

[0021] Furthermore, step S1 specifically includes:

[0022] S101: Correcting the test piece by correcting the components;

[0023] S102: Obtain the length of the test piece through a measuring unit.

[0024] Furthermore, step S102 specifically includes:

[0025] S1021: Obtaining a distance L0 between the first laser rangefinder and the second laser rangefinder, the distance of the test piece tested by the first laser rangefinder is L1, and the distance of the test piece tested by the second laser rangefinder is L2;

[0026] S1022: The first laser rangefinder and the second laser rangefinder send the obtained measurement data to the PC control unit, and the PC control unit calculates the length L=L0-L1-L2 of the test piece.

[0027] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0028] (1) By obtaining the length of the test piece, the position of the EL camera is automatically adjusted. When continuously testing photovoltaic modules of different sizes, there is no need to manually adjust the position of the EL camera. The EL detection system can quickly and accurately perform EL tests on photovoltaic modules, thereby improving the continuity of photovoltaic module production and the EL image effect. At the same time, it can avoid the situation where poor EL images are caused by inaccurate manual adjustment of the EL camera position;

[0029] (2) The position of the EL camera is automatically adjusted according to the length of the test piece, so that the detection system can continuously test photovoltaic modules of different sizes without manual adjustment of the EL camera position. The EL test of photovoltaic modules can be performed quickly and accurately, which improves the continuity of photovoltaic module production, EL image effect and production efficiency;

[0030] (3) The plane height of the horizontal conveying mechanism contacting the test piece is consistent with the plane height of the loading and unloading horizontal conveying mechanism contacting the test piece, so that the position of the test piece after the loading and unloading brackets are corrected only moves along the transmission direction, and does not deviate perpendicular to the transmission direction. The EL test of the photovoltaic module can be accurately performed, thereby improving the EL image effect of the photovoltaic module.

[0031] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0033] Figure 1 This is a schematic diagram of the overall structure of the photovoltaic module EL detection system;

[0034] Figure 2 It is a schematic diagram of the structure of the loading and unloading unit and the measuring unit of the EL detection system of the volt component;

[0035] Figure 3 The schematic diagram of the length L of the test piece to be tested for the measurement unit;

[0036] Figure 4 This is a schematic diagram of the relative position between the EL camera and the test piece after adjustment by the PC control unit;

[0037] Figure 5 A schematic diagram of the position of the first shot of the test piece;

[0038] Figure 6 A schematic diagram of the position of the second shot of the test piece;

[0039] Figure 7 This is a schematic diagram of the position of the second shot of the test piece.

[0040] Reference numerals:

[0041] 10-EL test unit; 11-EL test main cabinet; 12-loading and loading ports; 13-EL camera; 14-PC control unit; 15-horizontal conveying mechanism; 16-image display unit; 17-stable current and voltage power supply; 20-loading and loading units; 21-loading and loading brackets; 22-loading and loading horizontal conveying mechanism; 23-alignment assembly; 24-stop cylinder; 30-driving assembly; 40-measuring unit; 41a-first laser rangefinder; 41b-second laser rangefinder; 50-piece to be tested; 60-contact surface. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "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, it can be an electrical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The terms "top", "bottom", "above", "lower", and "on" used throughout the description are relative to the relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It is understood that devices are multifunctional regardless of their orientation in space.

[0045] Example 1

[0046] A specific embodiment of the present invention, as Figure 1-Figure 2 As shown, a photovoltaic module EL detection system is disclosed, including an EL test unit 10 and a measuring unit 40, the measuring unit 40 is used to obtain the length L of the test piece 50, the EL test unit 10 includes an EL camera 13 and a PC control unit 14, the PC control unit 14 adjusts the position of the EL camera 13 according to the length of the test piece 50.

[0047] Compared with the prior art, the photovoltaic module EL detection system provided in this embodiment automatically adjusts the position of the EL camera by obtaining the length of the test piece. When continuously testing photovoltaic modules of different sizes, there is no need to manually adjust the position of the EL camera. The photovoltaic modules can be quickly and accurately tested for EL, thereby improving the continuity of photovoltaic module production and the EL image effect. At the same time, it can avoid the situation where poor EL images are caused by inaccurate manual adjustment of the EL camera position.

[0048] The EL test unit 10 also includes an EL test main cabinet 11, a horizontal conveying mechanism 15, an image display unit 16 and a constant current and voltage power supply 17. The EL test main cabinet 11 is provided with a loading and unloading port 12 for the passage of the test piece 50. Specifically, the loading and unloading port 12 is arranged on the side of the EL test main cabinet 11.

[0049] It is worth noting that the horizontal transmission mechanism 15 can be a horizontal moving roller, a transmission belt or other mechanisms capable of achieving horizontal movement of the test piece 50 .

[0050] The EL camera 13, PC control unit 14, horizontal transmission mechanism 15 and voltage and current stabilizing power supply 17 are all arranged in the EL test main cabinet 11, which can prevent the dust in the external environment from damaging the electronic components. The EL camera 13 is connected to the PC control unit 14, and the PC control unit 14 can control the position change of the EL camera 13.

[0051] The horizontal conveying mechanism 15 is arranged on the EL test main body cabinet 11, specifically, the horizontal conveying mechanism 15 is connected to the inner wall of the EL test main body cabinet 11, the EL camera 13 is arranged below the horizontal conveying mechanism 15, and the image display unit 16 is arranged outside the EL test main body cabinet 11, specifically, the image display unit 16 is arranged on the top of the EL test main body cabinet 11.

[0052] It is worth noting that the EL camera 13 photographs the test piece 50 through the gap provided in the horizontal conveying mechanism 15. For example, when the horizontal conveying mechanism 15 is a horizontally movable roller, the rollers are not evenly distributed but have a gap. The EL camera 13 photographs the test piece 50 through the gap to avoid the evenly distributed rollers blocking the EL camera 13.

[0053] It is worth noting that there are N EL cameras 13 , 2≤N≤10, and the multiple EL cameras 13 are arranged perpendicular to the transmission direction of the test piece 50 .

[0054] The EL camera 13 , the image display unit 16 and the voltage and current stabilizing power supply 17 are all electrically connected to the PC control unit 14 . The voltage and current stabilizing power supply 17 provides a stable voltage and current for the system. The image display unit 16 is used to display the image of the test piece 50 acquired by the EL camera 13 .

[0055] The photovoltaic module EL detection system also includes a loading and unloading unit 20 , the horizontal height of which is consistent with the loading and unloading port 12 , ensuring that the test piece 50 can smoothly enter the horizontal conveying mechanism 15 from the loading and unloading unit 20 .

[0056] The loading and unloading unit 20 includes a loading and unloading bracket 21 and a loading and unloading horizontal conveying mechanism 22. The loading and unloading bracket 21 is arranged opposite to the loading and unloading port 12. The loading and unloading horizontal conveying mechanism 22 is arranged on the loading and unloading bracket 21, and the top of the loading and unloading horizontal conveying mechanism 22 is flush with the top of the horizontal conveying mechanism 15, ensuring that the test piece 50 is stable when entering the EL test main cabinet 11 from the loading and unloading bracket 21, avoiding displacement and deflection of the test piece 50, and ensuring the accuracy of EL imaging.

[0057] Specifically, the loading and unloading bracket 21 includes a crossbeam, a longitudinal beam and a column, and the crossbeam and the longitudinal beam form a square frame. The column is arranged on the direction frame as a leg of the square frame, and the loading and unloading horizontal transmission mechanism 22 is arranged in the above square frame. It should be noted that the beam along the transmission direction of the test piece 50 is the crossbeam, and correspondingly, the beam perpendicular to the transmission direction of the test component 50 is the longitudinal beam; the loading and unloading horizontal transmission mechanism 22 can be a horizontally movable roller for loading and unloading, a transmission belt or other mechanism that can realize the horizontal transmission of the test piece 50.

[0058] Taking the horizontally movable rollers for loading and unloading as an example, multiple rotating shafts are provided between the cross beams, and the two ends of the rotating shafts are respectively connected to the longitudinal beams. The horizontally movable rollers for loading and unloading are arranged on the rotating shafts, and each rotating shaft is provided with multiple horizontally movable rollers for loading and unloading.

[0059] In order to ensure that the test piece 50 does not shift in position when it moves to the EL test area and to ensure the accuracy of the test, the loading and unloading unit 20 also includes a correction component 23. The correction component 23 is arranged on the loading and unloading bracket 21. Specifically, the correction component 23 is arranged on the crossbeam of the loading and unloading bracket 21, and is symmetrically arranged in two groups, each group is provided with two. When the test piece 50 moves to the correction area, the correction component 23 corrects the test piece 50.

[0060] It is worth noting that the spacing between adjacent alignment components 23 arranged on the same side of the loading and unloading bracket 21 is not greater than the width of the test piece 50 .

[0061] The EL testing system provided in the embodiment of the present invention can be used alone, and the test piece 50 can be placed on the loading and unloading bracket 21 or removed from the loading and unloading bracket 21 by manual transportation, or it can be set on a photovoltaic module production line, and the test piece 50 can be automatically transferred to the loading and unloading bracket 21 from the previous production work.

[0062] When the EL test system is used alone, after the test is completed, the transmission direction of the horizontal conveying mechanism 15 and the loading and unloading horizontal conveying mechanism 22 can be changed to output the test piece 50 from the main cabinet 11 back to the loading and unloading bracket 21. Considering that the test piece 50 may fall from the loading and unloading bracket 21 when output from the EL test main cabinet 11, a stopper cylinder 24 can be provided on the loading and unloading bracket 21. The stopper cylinder 24 is provided on the longitudinal beam of the loading and unloading bracket 21 and is located on the longitudinal beam away from the loading and unloading port 12, and is used to limit the movement of the test piece 50 on the loading and unloading horizontal conveying mechanism 22, so as to prevent the test piece 50 from falling from the loading and unloading bracket 21 when output from the EL test main cabinet 11.

[0063] When the test piece 50 is transferred from other stations of the production line to the loading and unloading bracket 21, in order to avoid hindering the transfer of the test piece 50, the loading and unloading bracket 21 is not provided with a blocking cylinder 24. At the same time, another loading and unloading port can be opened on the side of the main cabinet 11 opposite to the loading and unloading bracket 21, and another loading and unloading bracket can be provided, so that the test piece 50 is output from the other side of the main cabinet to the subsequent production station after the test is completed.

[0064] The photovoltaic module EL detection system also includes a driving component 30, which is connected to the PC control unit 14 to control the movement of the horizontal conveying mechanism 15 and the loading and unloading horizontal conveying mechanism 22 and the movement of the EL camera 13. Specifically, the driving component is a servo motor.

[0065] In this embodiment, the measuring unit 40 is arranged on the loading and unloading unit 20, and includes two laser rangefinders, namely a first laser rangefinder 41a and a second laser rangefinder 41b. The measuring unit 40 is connected to the PC control unit 14. Specifically, the measuring unit 40 is arranged on the loading and unloading bracket 21, and the first laser rangefinder 41a and the second laser rangefinder 41b are respectively located on the cross beams of the loading and unloading bracket 21, and are arranged horizontally opposite to each other.

[0066] In order to accurately obtain the length of the test piece 50, the horizontal heights of the first laser rangefinder 41a and the second laser rangefinder 41b are higher than the contact surface 60 between the loading and unloading horizontal conveying mechanism 22 and the test piece 50. Specifically, the horizontal heights of the first laser rangefinder 41a and the second laser rangefinder 41b are 1 mm to 3 mm higher than the contact surface 60 between the loading and unloading horizontal conveying mechanism 22 and the test piece 50.

[0067] In this embodiment, the height of the plane where the horizontal conveying mechanism 15 contacts the test piece 50 is consistent with the height of the plane where the loading and unloading horizontal conveying mechanism 22 contacts the test piece 50, so as to ensure that the test piece 50 smoothly enters the EL test unit 10 from the loading and unloading unit 20, and the displacement of the test piece 50 does not occur, that is, the position of the test piece 50 after the loading and unloading bracket 21 is corrected only moves along the transmission direction, and the test piece 50 enters the EL test main cabinet 11 and is just located in the EL test area where the EL camera 13 is adjusted, so that the photovoltaic module can be accurately tested for EL, thereby improving the EL picture effect of the photovoltaic module.

[0068] The photovoltaic module EL detection system provided in the present embodiment has a measuring unit 40 on the loading and unloading unit 20. After the loading and unloading unit 20 aligns the test piece 50, the measuring unit 40 obtains the length of the test piece 50. The PC control unit 14 adjusts the position of the EL camera 13 according to the length of the test piece 50, so that a plurality of EL cameras 13 form an EL test area corresponding to the position of the aligning test piece 50. After the test piece 50 moves to the EL test area, an image is formed. The PC control unit 14 automatically adjusts the EL camera 13 according to the length of the test piece 50, thereby avoiding the situation where the EL image is poor due to inaccurate manual adjustment of the position of the EL camera 13.

[0069] In this embodiment, the position of the EL camera 13 is automatically adjusted according to the length of the test piece 50, so that the EL detection system can perform connection tests on photovoltaic modules of different sizes. There is no need to manually adjust the position of the EL camera, and the photovoltaic modules can be quickly and accurately tested for EL, thereby improving the continuity of the production of photovoltaic modules, EL image effects and production efficiency.

[0070] Example 2

[0071] Another specific embodiment of the present invention, as Figure 3-Figure 4 As shown, a photovoltaic module EL testing method is disclosed, using the photovoltaic module EL detection system of Example 1, the steps include:

[0072] S1: Obtain the length of the test piece 50.

[0073] The specific steps include:

[0074] S101: Correcting the test piece 50 by the correction component 23;

[0075] The test piece 50 is placed on the loading and unloading horizontal conveying mechanism 22 of the loading and unloading unit 20, and the alignment component 23 is used to align the test piece 50, and the test piece 50 is adjusted to the middle of the loading and unloading horizontal conveying mechanism 22, and the four sides of the test piece 50 are respectively kept parallel or perpendicular to the moving direction of the test piece 50. For example, the width direction of the test piece 50 is kept parallel to the moving direction of the test piece 50, and the length direction of the test piece 50 is perpendicular to the moving direction of the test piece 50.

[0076] S102: Obtaining the length of the test piece 50 by the measuring unit 40;

[0077] The length of the test piece 50 is measured by the measuring unit 40 disposed on the loading and unloading unit 20 to obtain the length L of the test piece 50 .

[0078] The specific measurement steps are as follows:

[0079] S1021: The distance between the first laser rangefinder 41a and the second laser rangefinder 41b is L0, the distance between the first laser rangefinder 41a and the nearest edge of the test piece 50 is L1, and the distance between the second laser rangefinder 41b and the nearest edge of the test piece 50 is L2;

[0080] S1022: The first laser rangefinder 41a and the second laser rangefinder 41b send the obtained measurement data information to the PC control unit 14, and the PC control unit 14 calculates the length L=L0-L1-L2 of the test piece 50.

[0081] S2: The PC control unit 14 adjusts the position of the EL camera 13 according to the length of the test piece 50 .

[0082] After the size test of the test piece 50 is completed, the measuring unit 40 transmits the length L of the test piece 50 to the PC control unit 14, and the PC control unit 14 adjusts the N EL cameras 13 so that the N EL cameras 13 are respectively located at positions L / 2N, 3L / 2N, ..., (2N-1)L / 2N in the length L direction of the test piece 50, as shown in FIG. Figure 4 shown.

[0083] S3: The test piece 50 is moved to the shooting area adjusted by the EL camera 13 for testing.

[0084] After the positions of the N EL cameras 13 are adjusted, the test piece 50 passes through the loading and unloading port 12 via the loading and unloading horizontal conveying mechanism 22, moves to the horizontal conveying mechanism 15 of the EL test unit 10 and moves to the test position to prepare for testing.

[0085] It is worth noting that the height of the plane where the horizontal conveying mechanism 15 contacts the test piece 50 is flush with the height of the plane where the loading and unloading horizontal conveying mechanism 22 contacts the test piece 50, so that the test piece 50 can smoothly enter the EL test unit 10 from the loading and unloading unit 20 without the test piece 50 being offset.

[0086] In the present embodiment, during the process of transporting the test piece 50 from the loading and unloading bracket 21 to the test area, the position of the test piece 50 only moves along the transmission direction, that is, the distance between the test piece 50 and the extension line of the beam where the first laser rangefinder 41a and the second laser rangefinder 41b are located remains unchanged. The test piece 50 enters the EL test main cabinet 11 and is located in the EL test area where the EL camera 13 is adjusted, so that the EL test unit 10 can accurately test the photovoltaic module, thereby improving the EL picture effect of the photovoltaic module.

[0087] S4: The test piece 50 enters the shooting area of ​​the EL camera 13 for testing, and an EL image is obtained, wherein the EL image is formed by stitching together the images of the test piece 50 moving three times when the EL camera 13 is shooting. Specifically, after the test piece 50 enters the EL test main cabinet 11 and the shooting area formed by the EL camera 13, the EL camera 13 shoots three times during the moving process, such as Figure 5-Figure 7 As shown, the images formed three times are finally spliced ​​into an EL image. The test piece 50 is photographed multiple times during the EL test process, thereby improving the quality of the EL image.

[0088] In the photovoltaic module EL testing method provided in the present embodiment, the test piece 50 is first placed on the loading and unloading unit 20 for alignment. After the alignment, the length of the test piece 50 is obtained by the measuring unit 40. The PC control unit 14 adjusts the position of the EL camera 13 according to the length of the test piece 50, so that the shooting areas of multiple EL cameras 13 form an EL test area. After the test piece 50 moves to the EL test area, an image is formed. The PC control unit 14 automatically adjusts the EL camera 13 according to the length of the test piece 50, thereby avoiding the situation where the EL image is poor due to inaccurate manual adjustment of the position of the EL camera 13.

[0089] In this embodiment, the position of the EL camera 13 is automatically adjusted according to the length of the test piece 50, so that the EL detection system can perform connection tests on photovoltaic modules of different sizes without manual adjustment of the EL camera position. The photovoltaic modules can be quickly and accurately tested for EL, thereby improving the continuity and production efficiency of the production of photovoltaic modules.

[0090] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A photovoltaic module EL detection method, characterized in that: A photovoltaic module EL detection system is used, the photovoltaic module EL detection system comprising an EL test unit (10), a loading and unloading unit (20) and a measuring unit (40), the measuring unit (40) being used to obtain the length of a test piece (50), the EL test unit (10) comprising an EL camera (13), a PC control unit (14) and a horizontal transmission mechanism (15), the PC control unit (14) automatically adjusting the position of the EL camera (13) according to the length of the test piece (50), the loading and unloading unit (20) comprising a loading and unloading horizontal transmission mechanism (22), the plane height of the horizontal transmission mechanism (15) contacting the test piece (50) being consistent with the plane height of the loading and unloading horizontal transmission mechanism (22) contacting the test piece (50); The photovoltaic module EL detection method comprises the following steps: S1: Obtain the length of the test piece (50); Step S1 specifically includes: S101: Correcting the test piece (50) by a correction component (23); S102: obtaining the length of the test piece (50) through the measuring unit (40); Step S102 specifically includes: S1021: obtaining a distance L0 between the first laser rangefinder (41a) and the second laser rangefinder (41b); the distance between the first laser rangefinder (41a) and the test object (50) is L1; and the distance between the second laser rangefinder (41b) and the test object (50) is L2; S1022: the first laser rangefinder (41a) and the second laser rangefinder (41b) send the obtained measurement data to the PC control unit (14), and the PC control unit (14) obtains the length L=L0-L1-L2 of the test piece (50) through calculation; S2: The PC control unit (14) adjusts the position of the EL camera (13) according to the length of the test piece (50); The PC control unit (14) adjusts the N EL cameras (13) so that the N EL cameras (13) are respectively located at positions L / 2N, 3L / 2N, and up to (2N-1)L / 2N in the length L direction of the test piece (50), where 2≤N≤10; S3: The test piece (50) is moved to the adjusted shooting area of ​​the EL camera (13) for testing to obtain an EL image.

2. The photovoltaic module EL detection method according to claim 1, characterized in that: The EL test unit (10) further comprises an EL test main body cabinet (11), and the horizontal transmission mechanism (15) is arranged in the EL test main body cabinet (11).

3. The photovoltaic module EL detection method according to claim 2, characterized in that: The EL camera (13) is arranged below the horizontal transmission mechanism (15).

4. The photovoltaic module EL detection method according to claim 2, characterized in that: The EL test main cabinet (11) is provided with a loading and unloading port (12) for the test piece (50) to pass through.

5. The photovoltaic module EL detection method according to claim 4, characterized in that: The horizontal height of the loading and unloading unit (20) is consistent with the horizontal height of the loading and unloading opening (12).

6. The photovoltaic module EL detection method according to claim 5, characterized in that: The loading and unloading unit (20) comprises a loading and unloading bracket (21), the loading and unloading bracket (21) is arranged opposite to the loading and unloading port (12), and a loading and unloading horizontal conveying mechanism (22) is arranged on the loading and unloading bracket (21).

7. The photovoltaic module EL detection method according to claim 6, characterized in that: It also includes a driving component (30), which is connected to the PC control unit (14) and controls the movement of the horizontal conveying mechanism (15), the loading and unloading horizontal conveying mechanism (22) and the movement of the EL camera (13).

8. The photovoltaic module EL detection method according to claim 5, characterized in that: The measuring unit (40) is arranged on the loading and unloading unit (20).

9. The photovoltaic module EL detection method according to claim 6, characterized in that: The measuring unit (40) has a horizontal height higher than a contact surface (60) between the loading and unloading horizontal conveying mechanism (22) and the piece to be tested (50).

Images