A method and system for fault detection of a photovoltaic module

Abstract

The application discloses a kind of photovoltaic module fault detection method and system, it is related to photovoltaic detection technical field, including detection box and the control end being set to the side wall of detection box, the first mobile component is arranged in the lower portion of detection box, the output end of first mobile component is fixedly connected with scanning part, the inside of detection box is fixedly connected with near-infrared camera by bar piece, the upper portion of detection box is provided with a plurality of clamping detection components in the first mobile component;Clamping detection component includes third telescopic component, support plate, a group of fixed plate, fourth drive motor, upper pressing plate and pressure sensor, and the measured pressure signal is input to control end by pressure sensor;The inside upper portion of detection box is provided with second mobile component, and the output end of second mobile component is connected with fitting component, and fitting component includes first fitting plate and the second fitting plate being set to the two sides of first fitting plate, and the application improves the comprehensiveness of fault detection.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic testing technology, specifically to a fault detection method and system for photovoltaic modules. Background Technology

[0002] With the continuous development of photovoltaic power plants in China, quality control of these plants is receiving increasing attention, as the quality of photovoltaic modules directly affects the efficiency and quality of photovoltaic power generation. Currently, EL (Electroluminescence) testing equipment is widely used for defect detection before manufacturing or during operation and maintenance. Among these, the EL system is the core equipment for photovoltaic module defect detection. By applying current or voltage, the tested product actively emits light, and a high-sensitivity camera captures the emitted image, thereby diagnosing internal defects and performance uniformity.

[0003] Currently, EL testing requires a dark environment because light in any environment will interfere with the weak near-infrared signal, leading to a decrease in image quality. Therefore, dark box testing stations are used on manufacturing production lines or when photovoltaic modules are removed for maintenance. However, how to conduct more comprehensive fault and defect detection remains a problem to be solved by professionals in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a fault detection method and system for photovoltaic modules to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a fault detection system for photovoltaic modules, comprising a detection box and a control terminal disposed on one side wall of the detection box, a first moving component disposed below the detection box, a scanning unit fixedly connected to the output end of the first moving component, a near-infrared camera fixedly connected inside the detection box via a rod, and a plurality of clamping detection components disposed above the first moving component in the detection box; the clamping detection components include a third telescopic component, a support plate, a set of fixed plates, a fourth drive motor, an upper pressure plate, and a pressure sensor, the pressure sensor inputting the measured pressure signal to the control terminal; a second moving component disposed above the inside of the detection box, the output end of the second moving component connected to a bonding component, the bonding component including a first bonding plate and second bonding plates disposed on both sides of the first bonding plate.

[0006] The present invention further illustrates that a loading platform is provided on the input side of the detection box, and an automatic box door is provided on the side of the detection box near the loading platform.

[0007] The present invention further describes that the first moving component includes a first drive motor, a first auxiliary slide, a second drive motor, and a connecting frame. The first auxiliary slide and the first drive motor are arranged parallel to each other on the same horizontal plane. The output end of the first drive motor is slidably connected to the bottom surface of the second drive motor through a plate. The first auxiliary slide and the other side of the bottom surface of the second drive motor are slidably connected through a plate. The second drive motor is arranged perpendicular to the first drive motor. The output end of the second drive motor is fixedly connected to the scanning unit through the connecting frame.

[0008] The present invention further illustrates that the interior of the detection box is fixedly connected by several trusses, and the third telescopic component is fixedly connected to the adjacent truss on one side relative to its output end by a plate.

[0009] The present invention further describes that the support plate is composed of a horizontal plate and a vertical plate fixed in an L-shape. The horizontal plate of the support plate is used to support and connect the photovoltaic module. The vertical plate of the support plate is fixedly connected to the fixed plate on the opposite side by bolts. A set of fixed plates are connected through each other and a rotating shaft is connected by a bearing. One end of the rotating shaft is connected to the fourth drive motor. The fourth drive motor is fixedly supported on the adjacent fixed plate. The middle surface of the rotating shaft is fixedly connected to the upper pressure plate. The front end of the upper pressure plate is set to be arc-shaped.

[0010] The present invention further illustrates that the pressure sensor is embedded in the front end of the cross plate of the support plate.

[0011] The present invention further illustrates that the bonding assembly also includes a connecting rod, a second telescopic component, and a connecting block. The upper surface of the first bonding plate is fixed to the connecting rod, the top of the connecting rod is fixedly connected to the connecting block through it, a limiting rod is fixedly connected inside the second bonding plate, the limiting rod is slidably connected to the inside of the first bonding plate, the top of each of the second bonding plates is connected to the second telescopic component, and the output end of the second telescopic component is fixedly connected to the second bonding plate through a plate.

[0012] The present invention further describes a fault detection method for photovoltaic modules, the method being as follows: S1: The photovoltaic module under test is supported and placed on the clamping and testing component inside the testing box. The clamping and testing component determines the accuracy of its placement position. S2: Acquire an image of the back of the photovoltaic module, and determine whether to perform a power-on detection after image analysis; if power-on detection is performed, proceed to S3; if power-on detection is paused, proceed to S6. S3: The photovoltaic module is powered on, the clamping and detection module performs the clamping process on its frame position, the automatic door closes, and the near-infrared camera located above the photovoltaic module performs preliminary defect detection; S4: After the initial defect detection is completed, the bonding component is used to bond to the upper surface of the photovoltaic module for edge infrared detection; S5: The control terminal receives the detection data and sends it back to the user terminal; S6: Photovoltaic module unloading, repeat S1-S5 to complete batch photovoltaic module fault detection.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention uses a scanning unit, a clamping detection component, and a bonding component to first confirm the accuracy of the placement position and the powerability of the photovoltaic module. After confirmation, a near-infrared camera located above the photovoltaic module is powered on to perform preliminary defect detection. After the preliminary defect detection is completed, the bonding component is used to bond to the upper surface of the photovoltaic module to perform edge infrared detection to supplement the detection results of the preliminary defect detection. The control terminal records all fault conditions, making the fault detection results more comprehensive and accurate. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the structural layout of the second moving component of the present invention; Figure 4 This is the present invention. Figure 2 Enlarged schematic diagram of the structure of region A; Figure 5 This is the present invention. Figure 2 Enlarged schematic diagram of region B structure; Figure 6 This is the present invention. Figure 2 Enlarged schematic diagram of the C region structure; Figure 7 This is a schematic diagram of two states of the clamping detection component of the present invention; In the diagram: 1. Detection box; 2. Control terminal; 3. Loading platform; 4. First moving component; 41. First drive motor; 42. First auxiliary slide; 43. Second drive motor; 44. Connecting frame; 5. Scanning unit; 6. Second moving component; 60. Synchronization frame; 61. Third drive motor; 62. First conveyor belt pulley; 63. Second conveyor belt pulley; 64. Second auxiliary slide; 65. Main moving support; 66. First telescopic component; 67. Second moving secondary support; 68. Sliding frame; 69. Lifting frame; 7. Bonding component; 71. First bonding plate; 72. Connecting rod; 73. Second telescopic component; 74. Second bonding plate; 75. Connecting block; 8. Clamping detection component; 81. Third telescopic component; 82. Support plate; 83. Fixing plate; 84. Fourth drive motor; 85. Upper pressure plate; 86. Pressure sensor. Detailed Implementation

[0015] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] Example 1, please refer to Figure 1-7 The present invention provides a technical solution: a fault detection system for photovoltaic modules, including a detection box 1, the interior of the detection box 1 is used to detect photovoltaic modules, and a control terminal 2 is fixedly installed on one side wall of the detection box 1. The control terminal 2 is used to execute fault detection procedures and receive fault detection data in real time, and make timely adjustments to the detection procedures. The input side of the inspection box 1 is equipped with a loading platform 3. An automatic door is provided on the side of the inspection box 1 near the loading platform 3. The automatic door can be opened by means of up and down lifting, horizontal sliding, and rotation, which will not be described in detail here. When the automatic door is closed, the interior of the inspection box 1 remains sealed and opaque to facilitate EL inspection. A near-infrared camera is fixedly connected to the interior of the inspection box 1 by a rod. The near-infrared camera is used to collect the weak near-infrared light signal emitted by the photovoltaic module after it is powered on for defect detection. The near-infrared camera is set above the photovoltaic module, not shown in the figure.

[0017] See Figure 2 and Figure 3 The interior of the testing box 1 is fixedly connected by several trusses. A first moving component 4 is set at the bottom of the testing box 1. A scanning unit 5 is fixedly connected to the output end of the first moving component 4. The scanning unit 5 is used to collect the back image of the photovoltaic module. After image stitching processing, it is analyzed whether the power-on process can be performed. If the power-on process cannot be performed, the subsequent EL test will not be performed. If the power-on process can be performed, the user will be notified at the control terminal 2 to perform the power-on process. The power-on equipment is fixed on the inner wall of the testing box 1 and is used to power on the photovoltaic module. The user can connect it manually or use a special electrical contact clamp to perform the power-on operation. Specifically, the power-on equipment injects a positive DC current or voltage into the photovoltaic module, causing the internal PN junction to generate carrier recombination, thereby exciting photons and generating electroluminescence. The near-infrared camera identifies defects such as hidden cracks, poor soldering, broken grids, and attenuation that are not visible to the naked eye based on the difference in luminescence intensity of the photovoltaic module. Furthermore, the first moving component 4 includes a first drive motor 41, a first auxiliary slide 42, a second drive motor 43, and a connecting frame 44. Both the first drive motor 41 and the second drive motor 43 are preferably linear motors. The first auxiliary slide 42 is parallel to the first drive motor 41 and is arranged on the same horizontal plane. The output end of the first drive motor 41 is slidably connected to the bottom surface of the second drive motor 43 via a plate. The other side of the bottom surface of the first auxiliary slide 42 and the second drive motor 43 are slidably connected via a plate. When the output end of the first drive motor 41 drives the second drive motor 43 to move in a first direction, the first auxiliary slide 42 applies a balancing support force to the moving second drive motor 43 to ensure the stability of the second drive motor 43 sliding in the first direction. The second drive motor 43 is arranged perpendicular to the first drive motor 41, meaning the output end of the second drive motor 43 moves in a second direction. (Refer to...) Figure 6 The output end of the second drive motor 43 is fixedly connected to the scanning unit 5 through the connecting bracket 44. Therefore, under the action of the first drive motor 41 and the second drive motor 43, the scanning unit 5 can gradually adjust its position along the first direction and the second direction to accurately position and capture the back image of the photovoltaic module and the power interface image, and determine whether the power-on process can be performed.

[0018] See Figure 4 The detection box 1 is located above the first moving component 4 and is provided with several clamping detection components 8. The clamping ends of the several clamping detection components 8 are respectively set at the four right angles of the photovoltaic module. The clamping detection component 8 includes a third telescopic component 81. The third telescopic component 81 is preferably a pneumatic or hydraulic component. The side of the third telescopic component 81 relative to its output end is fixedly connected to the adjacent truss by a plate. The output end of the third telescopic component 81 is fixedly connected to a support plate 82. The support plate 82 is composed of a horizontal plate and a vertical plate fixed in an L shape. The horizontal plate of the support plate 82 is used to support and connect the photovoltaic module. The vertical plate of the support plate 82 is fixedly connected to a set of fixed plates 83 by bolts on the opposite side. The set of fixed plates 83 are connected through each other and a rotating shaft is connected by a bearing. One end of the rotating shaft is connected to a fourth drive motor 84. The fourth drive motor 84 is fixedly supported on the adjacent fixed plate 83. An upper pressure plate 85 is fixedly connected to the middle surface of the rotating shaft. The front end of the upper pressure plate 85 is rounded to accommodate the contact of photovoltaic module frames of various sizes. (See reference...) Figure 7 (a) In the initial state of the upper pressure plate 85, the angle formed by the upper pressure plate 85 and the horizontal plate of the support plate 82 is not less than 90°, which is the placement state, facilitating the placement and clamping of photovoltaic modules; see reference Figure 7 (b) is in a clamping state; It should be noted that a pressure sensor 86 is embedded in the front end of the horizontal plate of the support plate 82. The pressure sensor 86 inputs the measured pressure signal to the control terminal 2 to determine the clamping status of the photovoltaic module during the test. Before the photovoltaic module is placed into the testing box 1, the dimensions of the photovoltaic module to be tested are input to the control terminal 2. The output terminal of the third telescopic component 81 controls the support plate 82 to move the pressure sensor 86 to the bottom of the frame where the photovoltaic module is clamped. All the upper pressure plates 85 remain in their initial state. Then the photovoltaic module to be tested is placed on the horizontal plate of the support plate 82 and the pressure sensor 86 can detect the pressure signal. The pressure signal determines whether the photovoltaic module is placed in place. If it is placed in place, the fourth drive motor 84 starts at the same time and uses the rotating shaft to rotate the upper pressure plate 85 to the clamping state. If it is not placed in place, the clamping process is not performed first.

[0019] See Figure 2 and Figure 3 The upper part of the inside of the detection box 1 is equipped with a second moving component 6. The output end of the second moving component 6 is connected to the bonding component 7. The second moving component 6 is used to assist the bonding component 7 in performing more accurate fault detection. The second moving component 6 includes a third drive motor 61 whose housing is fixed on the truss. The output end of the third drive motor 61 is driven by a first conveyor pulley 62. The output end of the first conveyor pulley 62 is driven by a set of second conveyor pulleys 63 through a rod. A second auxiliary carriage 64 is fixedly connected below the set of second conveyor pulleys 63. The two ends of the slide 64 are fixedly installed on the truss by angle steel threads. A movable main support 65 is slidably connected between a group of second auxiliary slides 64. Movable secondary supports 67 are fixedly connected to both ends of the movable main support 65 along the second direction. The third drive motor 61 is set as a bidirectional motor. When the third drive motor 61 starts in the forward direction, its output end drives the second conveyor belt wheel 63 through the first conveyor belt wheel 62. The second conveyor belt wheel 63 drives the movable main support 65 to move synchronously. Therefore, the movable main support 65 and the movable secondary support 67 will move synchronously along the first direction. The second moving component 6 also includes a first telescopic component 66. The first telescopic component 66 uses a linear motor or pneumatic-hydraulic element to perform the lifting process. The downward output end of the first telescopic component 66 is fixedly connected to a lifting frame 69. The upper surface of the lifting frame 69 is fixedly connected to two sides of a sliding frame 68 by bolts. The surface of the sliding frame 68 is slidably connected to the adjacent moving sub-support 67. The two ends of the lifting frame 69 are fixedly connected to a synchronous frame 60 by plates. The synchronous frame 60 is located directly below the lifting frame 69. When the output end of the first telescopic component 66 extends, it drives the lifting frame 69 to descend synchronously, so that the bonding component 7 can subsequently contact the upper surface of the photovoltaic module.

[0020] See Figure 6Below the second moving component 6, there is a bonding component 7. The bonding component 7 includes a first bonding plate 71. A connecting rod 72 is fixed on the upper surface of the first bonding plate 71. A connecting block 75 is fixed through the top of the connecting rod 72. The connecting block 75 is fixedly connected to the synchronous frame 60. When the synchronous frame 60 moves horizontally or rises and falls, it synchronously drives the bonding component 7 to assist in performing the fault detection process of the photovoltaic module. Furthermore, the first bonding plate 71 is provided with second bonding plates 74 on both sides along the second direction. The second bonding plate 74 is fixedly connected to a limiting rod inside, and the limiting rod is slidably connected to the inside of the first bonding plate 71. The top of each of the second bonding plates 74 is connected to a second telescopic component 73. Specifically, the second telescopic component 73 is preferably a pneumatic element. The output end of the second telescopic component 73 is fixedly connected to the second bonding plate 74 through a plate. The second telescopic component 73 can control the extension length of the second bonding plate 74 along the second direction to adapt to the bonding detection of multi-size photovoltaic modules.

[0021] In this embodiment, the automatic door opens during loading, and a robotic arm or manual loading is used outside the inspection box 1. The photovoltaic module dimensions are pre-input at the control terminal 2, and the clamping inspection component 8 is adjusted to the placement state, wherein no clamping force is applied to the photovoltaic module frame in the placement state. Subsequently, the scanning unit 5, driven by the first moving component 4, performs inspection on the back of the photovoltaic module. While ensuring that power-on inspection can be performed, the clamping inspection component 8 is adjusted to the clamping state. After that, the photovoltaic module is powered on, the automatic door closes, and the inspection box 1 performs defect inspection through a near-infrared camera to obtain preliminary fault detection results. In order to improve the accuracy of the fault detection results, the bonding component 7, with the assistance of the second moving component 6, performs edge infrared inspection to obtain more accurate detection results.

[0022] Example 2: A fault detection method for photovoltaic modules, implemented based on the above-mentioned fault detection system for photovoltaic modules, the method is as follows: S1: The photovoltaic module under test is supported and placed on the clamping and testing component 8 inside the testing box 1. The clamping and testing component 8 determines the accuracy of its placement position. Before placing the photovoltaic module, the pressure sensor 86 is zeroed. When placing the photovoltaic module, the pressure value measured by the pressure sensor 86 in the clamping detection component 8 is recorded as Fi, where i is from 1 to n, n is the total number of pressure sensors 86, n is 4 in this embodiment, and i is the serial number of the pressure sensor 86, which has unique identification. Therefore, the accuracy of the above placement position is judged as follows: n sets of pressure values ​​are transmitted and displayed on the control terminal 2, the average pressure value of the n sets of pressure values ​​is obtained, and the pressure difference of the n sets of pressure values ​​is compared with the obtained average pressure value in turn. The difference limit is input in advance on the control terminal 2. When the pressure value is zero or the pressure difference is lower than the difference limit, it is judged that the placement position of the photovoltaic module is inaccurate, which will be detrimental to subsequent fault detection. Therefore, the subsequent process is suspended first, and the user adjusts the placement position of the photovoltaic module. After the adjustment is correct, the subsequent detection is carried out. Meanwhile, the control terminal 2 records the pressure values ​​measured by each pressure sensor 86 after the device is placed stably, and denoted as the initial bearing pressure value fi, where i ranges from 1 to n, and n is the total number of pressure sensors 86.

[0023] S2: Acquire an image of the back of the photovoltaic module, and determine whether to perform a power-on detection after image analysis; if power-on detection is performed, proceed to S3; if power-on detection is paused, proceed to S6. Based on image stitching and AI recognition technology, after the photovoltaic module under test is placed, the first moving component 4 moves the scanning unit 5 along a preset path and takes a fixed-point picture. The scanning unit 5 collects the back image of the photovoltaic module and analyzes whether the power-on process can be performed under image stitching processing. In particular, damage analysis is performed on the power-on interface. The damage analysis includes exposed pins, exposed copper wires, melting, deformation, insulation layer damage, melting marks, etc. If damage is detected, the module will be directly unloaded without further defect detection. If there is no damage on the back and no damage to the interface, the next step of preliminary defect detection will be carried out.

[0024] S3: The photovoltaic module is powered on, the clamping and detection component 8 performs the clamping process on its frame position, the automatic door closes, and the near-infrared camera located above the photovoltaic module performs preliminary defect detection.

[0025] When powered on, users can connect manually or use a special electrical contact clamp to power on the photovoltaic module. The power-on equipment injects a positive DC current or voltage into the photovoltaic module to generate electroluminescence. The near-infrared camera identifies defects such as microcracks, poor soldering, broken grids, and attenuation that are not visible to the naked eye based on the difference in luminescence intensity of the photovoltaic module, so as to perform preliminary defect detection. The preliminary defect detection results are transmitted to the control terminal 2 for analysis and retrieval.

[0026] S4: After the initial defect detection is completed, the bonding component 7 is used to bond to the upper surface of the photovoltaic module for edge infrared detection; Guided by the second moving component 6, the bonding component 7 moves to the front end of the upper surface of the photovoltaic module, and then descends to the upper surface of the photovoltaic module and bonds with it. It should be noted that the bottom surfaces of the first bonding plate 71 and the second bonding plate 74 can be coated with a material with a low coefficient of friction, such as polytetrafluoroethylene, to improve the stability of the photovoltaic module under the bonding and sliding of the bonding component 7. First, the bonding component 7 is just bonded to the upper surface of the photovoltaic module, and the first bonding movement is performed. During the bonding movement, the pressure data fed back by the pressure sensor 86 in real time is compared with the initial pressure value of the corresponding pressure sensor 86. If there is a large fluctuation in the data, it indicates that there is a problem with the flatness of the front of the photovoltaic module. The data is recorded in the control terminal 2. Subsequently, under the guidance of the second moving component 6, the bonding component 7 moves again to the front end of the upper surface of the photovoltaic module, and maintains a certain distance from the front end to ensure the emission of near-infrared light signals. The bonding component 7 is lowered to the auxiliary detection distance L by the action of the second moving component 6. The auxiliary detection distance L is used to ensure that the overall quality of the photovoltaic module surface is not affected under pressure. The first bonding plate 71 applies downward pressure to the photovoltaic module surface. During the downward pressure process, the near-infrared camera performs edge infrared detection at the edge of the photovoltaic module frame. During edge infrared detection, the bonding component 7, guided by the second moving component 6, adopts a segmented pressing method. The photovoltaic module is segmented and pressed down for detection along the moving direction of the bonding component 7. The subsequent pressing detections also descend to the auxiliary detection distance L. The near-infrared camera performs edge infrared detection and transmits the edge infrared detection data to the control terminal 2, recording all fault conditions, making the fault detection results more comprehensive and accurate.

[0027] In addition, by setting a second bonding plate 74 with an adjustable distance, sufficient edge infrared detection is ensured, while the downward pressure is balanced to prevent damage to the surface of the photovoltaic module.

[0028] S5: Control terminal 2 receives the detection data and sends it back to the user terminal; S6: Photovoltaic module unloading, repeat S1-S5 to complete batch photovoltaic module fault detection.

[0029] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", 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 invention, 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 invention.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fault detection system for photovoltaic modules, comprising a detection box (1) and a control terminal (2) disposed on one side wall of the detection box (1), characterized in that: The detection box (1) is provided with a first moving component (4) below it. The output end of the first moving component (4) is fixedly connected to a scanning unit (5). The inside of the detection box (1) is fixedly connected to a near-infrared camera by a rod. The detection box (1) is provided with a plurality of clamping detection components (8) above the first moving component (4). The clamping detection component (8) includes a third telescopic component (81), a support plate (82), a set of fixing plates (83), a fourth drive motor (84), an upper pressure plate (85), and a pressure sensor (86). The pressure sensor (86) inputs the measured pressure signal to the control terminal (2). The upper part of the inside of the detection box (1) is provided with a second moving component (6), and the output end of the second moving component (6) is connected to a bonding component (7). The bonding component (7) includes a first bonding plate (71) and a second bonding plate (74) disposed on both sides of the first bonding plate (71).

2. The fault detection system for photovoltaic modules according to claim 1, characterized in that: The input side of the testing box (1) is provided with a loading platform (3), and the side of the testing box (1) near the loading platform (3) is provided with an automatic box door.

3. The fault detection system for photovoltaic modules according to claim 1, characterized in that: The first moving component (4) includes a first drive motor (41), a first auxiliary slide (42), a second drive motor (43), and a connecting frame (44). The first auxiliary slide (42) and the first drive motor (41) are arranged parallel to each other on the same horizontal plane. The output end of the first drive motor (41) is slidably connected to the bottom surface of the second drive motor (43) through a plate. The first auxiliary slide (42) and the other side of the bottom surface of the second drive motor (43) are slidably connected through a plate. The second drive motor (43) and the first drive motor (41) are arranged in a vertical direction. The output end of the second drive motor (43) is fixedly connected to the scanning unit (5) through the connecting frame (44).

4. The fault detection system for photovoltaic modules according to claim 1, characterized in that: The interior of the detection box (1) is fixedly connected by several trusses, and the third telescopic component (81) is fixedly connected to the adjacent truss by a plate on one side relative to its output end.

5. A fault detection system for photovoltaic modules according to claim 4, characterized in that: The support plate (82) is composed of a horizontal plate and a vertical plate fixed in an L-shape. The horizontal plate of the support plate (82) is used to support and connect photovoltaic modules. The vertical plate of the support plate (82) is fixedly connected to the fixing plate (83) on the opposite side by bolts. A rotating shaft is connected between the set of fixing plates (83) through and bearings are connected to it. One end of the rotating shaft is connected to the fourth drive motor (84) for transmission. The fourth drive motor (84) is fixedly supported on the adjacent fixing plate (83). The middle surface of the rotating shaft is fixedly connected to the upper pressure plate (85). The front end of the upper pressure plate (85) is set in an arc shape.

6. The fault detection system for photovoltaic modules according to claim 5, characterized in that: The pressure sensor (86) is embedded in the front end of the cross plate of the support plate (82).

7. A fault detection system for photovoltaic modules according to claim 1, characterized in that: The bonding assembly (7) further includes a connecting rod (72), a second telescopic component (73), and a connecting block (75). The upper surface of the first bonding plate (71) is fixed to the connecting rod (72), and the top of the connecting rod (72) is fixedly connected to the connecting block (75). A limiting rod is fixedly connected inside the second bonding plate (74), and the limiting rod is slidably connected to the inside of the first bonding plate (71). The top of each of the second bonding plates (74) is connected to the second telescopic component (73) in a transmission manner. The output end of the second telescopic component (73) is fixedly connected to the second bonding plate (74) through a plate.

8. A fault detection method for photovoltaic modules, implemented based on a fault detection system for photovoltaic modules as described in any one of claims 1-7, characterized in that: The method is as follows: S1: The photovoltaic module under test is supported and placed on the clamping detection component (8) inside the detection box (1). The clamping detection component (8) determines the accuracy of its placement position. S2: Acquire an image of the back of the photovoltaic module, and determine whether to perform a power-on detection after image analysis; if power-on detection is performed, proceed to S3; if power-on detection is paused, proceed to S6. S3: The photovoltaic module is powered on, the clamping and testing component (8) performs the clamping process on its frame position, the automatic box door closes, and the near-infrared camera located above the photovoltaic module performs preliminary defect detection; S4: After the initial defect detection is completed, the upper surface of the photovoltaic module is bonded with the bonding component (7) and the edge gap infrared detection is performed. S5: The control terminal (2) receives the detection data and sends it back to the user terminal; S6: Photovoltaic module unloading, repeat S1-S5 to complete batch photovoltaic module fault detection.

9. A fault detection method for photovoltaic modules according to claim 8, characterized in that: Before placing the photovoltaic module in S1, the pressure sensor (86) is zeroed. When the photovoltaic module is placed, the pressure sensor (86) in the clamping detection component (8) records the measured pressure value as Fi, where i is 1 to n, n is the total number of pressure sensors (86), and i is the serial number of the pressure sensor (86). The accuracy of the placement position is judged as follows: n sets of pressure values ​​are transmitted and displayed on the control terminal (2), the average pressure value of the n sets of pressure values ​​is obtained, and the pressure difference of the n sets of pressure values ​​is compared with the obtained average pressure value. The difference limit is input in advance on the control terminal (2). When the pressure value is zero or the pressure difference is lower than the difference limit, it is judged that the placement position of the photovoltaic module is inaccurate, which will be detrimental to subsequent fault detection. Therefore, the subsequent process is suspended first, and the user adjusts the placement position of the photovoltaic module. After the adjustment is correct, the subsequent detection is carried out.

10. A fault detection method for photovoltaic modules according to claim 8, characterized in that: In S4, the bonding component (7) is just bonded to the upper surface of the photovoltaic module and the first bonding movement is performed. During the bonding movement, the pressure data fed back by the pressure sensor (86) in real time is compared with the initial pressure value of the corresponding pressure sensor (86). If there is a large fluctuation in the data, it indicates that there is a problem with the flatness of the front of the photovoltaic module. The data is stored in the control terminal (2). Afterwards, under the guidance of the second moving component (6), the bonding component (7) moves again to the front end of the upper surface of the photovoltaic module to perform edge infrared detection. Under the guidance of the second moving component (6), the bonding component (7) adopts a segmented pressing method to perform segmented pressing detection on the photovoltaic module along the moving direction of the bonding component (7). The subsequent pressing detection also descends to the auxiliary detection distance L. The near-infrared camera performs edge infrared detection and transmits the edge infrared detection data to the control terminal (2).

Images