Detection method, detection device and detection system of photovoltaic module

Abstract

The invention relates to a photovoltaic module detection method, a photovoltaic module detection device and a photovoltaic module detection system.The detection method comprises the steps that a photovoltaic module is installed at a detection station of an air pressure adjusting box, air in a cavity of the air pressure adjusting box is pumped out, so that the air pressure value of the cavity is a set negative pressure value; liquid is sprayed to the surface, deviating from the cavity, of the photovoltaic module, a camera placed in the cavity is used for shooting a sample image, a computer is used for obtaining the sample image, the computer is used for calculating a water leakage sample value according to the sample image, and therefore the sealing reliability degree of the sealant of the photovoltaic module is detected. And detecting the waterproof grade of the photovoltaic module.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic module detection, and in particular to a photovoltaic module detection method, detection device and detection system. Background Art

[0002] In the prior art, a photovoltaic module includes a laminate and a frame, and the frame is installed at the edge of the laminate. The laminate includes electrically connected photovoltaic cells. The laminate and the frame are connected by a sealant, and the sealant is used to prevent liquid or air from entering the interior of the laminate, thereby reducing the possibility of corrosion, rust or oxidation of the internal structural parts of the laminate. Therefore, the sealing reliability of the sealant is related to the working reliability of the photovoltaic module, and the sealing reliability of the sealant is related to the service life of the photovoltaic module. After the photovoltaic module is prepared, it is necessary to detect the sealing reliability of the sealant of the photovoltaic module. Summary of the invention

[0003] In view of this, the present application provides a photovoltaic module detection method, a photovoltaic module detection device and a photovoltaic module detection system, which can be used to detect the sealing reliability of the sealant of the photovoltaic module, and thus can be used to detect the waterproof level of the photovoltaic module.

[0004] In a first aspect, the present application provides a photovoltaic module detection method, the detection method comprising:

[0005] Step S1: Install the photovoltaic module at the inspection station of the air pressure regulating box.

[0006] Step S2: extracting gas from the cavity of the air pressure regulating box to make the air pressure value of the cavity a first negative pressure value.

[0007] Step S3: spraying liquid onto the surface of the photovoltaic module facing away from the cavity.

[0008] Step S4: During the execution of step S2 and step S3, a camera placed in the cavity is used to capture an image of the sample.

[0009] Step S5: Obtain a sample image using a computer and calculate a water leakage sample value based on the sample image using a computer. If the water leakage sample value is greater than or equal to the first set value, stop the current detection process. If the water leakage sample value is less than the first set value, execute step S6: set the air pressure value of the cavity to a second negative pressure value, wherein the absolute value P2 of the second negative pressure value is greater than the absolute value P1 of the first negative pressure value.

[0010] Optionally, the detection method of the present application also includes: if the water leakage sample value is greater than the second set value, stopping the current detection process; if the water leakage sample value is less than the second set value, executing step S7: making the air pressure value of the cavity a third negative pressure value, wherein the absolute value P3 of the third negative pressure value is greater than the absolute value P2 of the second negative pressure value.

[0011] Optionally, the detection method of the present application also includes: if the water leakage sample value is greater than a third set value, stopping the current detection process; if the water leakage sample value is less than the third set value, and under the condition that the air pressure value in the cavity is a third negative pressure value, executing steps S3, S4 and S5 for at least one hour.

[0012] Optionally, in step S6, the difference between the absolute value P2 and the absolute value P1 is P 21 , satisfying 500Pa≤P 21 ≤700Pa.

[0013] Optionally, in step S7, the difference between the absolute value P3 and the absolute value P2 is P 32 , satisfying 500Pa≤P 32 ≤700Pa.

[0014] Optionally, under the condition that the air pressure value of the cavity is a first negative pressure value and the water leakage sample value is less than the first set value, the time for executing steps S3, S4 and S5 is at least one hour, and / or, under the condition that the air pressure value of the cavity is a second negative pressure value and the water leakage sample value is less than the second set value, the time for executing steps S3, S4 and S5 is at least one hour.

[0015] Optionally, step S1 further includes: using waterproof glue to seal and connect the frame of the photovoltaic module and the inspection station.

[0016] In the second aspect, the present application provides a detection device for a photovoltaic module, the detection device for a photovoltaic module is used to detect the photovoltaic module according to the detection method of the photovoltaic module described above, and the detection device for the photovoltaic module includes an air pressure regulating box, an air pressure regulator, a sprayer and a blocking member. The air pressure regulating box is provided with a cavity, a first opening and a second opening, the first opening is connected to the second opening through the cavity, the air pressure regulating box includes a detection station, the detection station includes a step structure, the step structure is used to support the frame of the photovoltaic module, and the step structure encloses the first opening. The air pressure regulator is connected to the second opening, and the air pressure regulator is used to adjust the air pressure in the cavity of the air pressure regulating box. The sprayer is installed in the air pressure regulating box and is located outside the cavity. The sprayer is used to spray liquid on the surface of the photovoltaic module away from the cavity. The blocking member is used to be installed between the side wall of the step structure and the side wall of the frame, and the blocking member has a set height dimension D1, satisfying D1≥10mm.

[0017] Optionally, the sprayer includes four top corner nozzles, the inspection station includes four top corner stations, each top corner station is equipped with a corresponding top corner nozzle, and the top corner nozzle is used to spray the corresponding top corner parts in the photovoltaic module; and / or, the sprayer includes four edge nozzles, the inspection station includes four edge stations, each edge station is equipped with a corresponding edge nozzle, and the edge nozzle is used to spray the corresponding edge parts in the photovoltaic module.

[0018] In a third aspect, the present application provides a photovoltaic module detection system, the photovoltaic module detection system comprising a camera, a computer and the photovoltaic module detection device described above. The camera is installed in the cavity of the air pressure regulating box, and the camera is used to shoot a sample image. The computer is connected to the camera data, and the computer is used to obtain the sample image and analyze the water leakage sample value according to the sample image. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 is a schematic cross-sectional structural diagram of a photovoltaic module in a specific embodiment;

[0021] Figure 2 A schematic cross-sectional view of a detection device provided in the present application in a specific embodiment;

[0022] Figure 3 It is a schematic diagram of the assembly structure of the photovoltaic module and the detection device in a cross-sectional view;

[0023] Figure 4 The schematic diagram of the assembly structure of the photovoltaic module and the detection device in a cross-sectional view, wherein: Figure 4 The detection device further comprises a blocking member;

[0024] Figure 5 for Figure 4 A schematic diagram of the partially enlarged structure of part A;

[0025] Figure 6 It is a schematic diagram of the assembly structure of the air pressure regulating box and the sprinkler in a three-dimensional perspective;

[0026] Figure 7 It is a schematic diagram of the assembly structure of the air pressure regulating box and the photovoltaic module from a top view;

[0027] Figure 8The schematic diagram of the assembly structure of the photovoltaic module, the detection device and the camera in a cross-sectional view;

[0028] Fig. 9 This is a flow chart of a specific embodiment of the detection method provided in this application.

[0029] Reference numerals:

[0030] 10-Detection device;

[0031] 1-Air pressure regulating box;

[0032] 11- cavity;

[0033] 12-First opening;

[0034] 13- Second opening;

[0035] 14- Inspection station;

[0036] 141- Step structure;

[0037] 141a- step side wall;

[0038] 141b- step bottom wall;

[0039] 142-corner station;

[0040] 143-Edge station;

[0041] 2- Gas pressure regulator;

[0042] 3-Sprinkler;

[0043] 31- top angle nozzle;

[0044] 32-Edge position nozzle;

[0045] 4-Blocking piece;

[0046] 20- Photovoltaic modules;

[0047] 20a - laminate;

[0048] 20b-border;

[0049] 201- top corner;

[0050] 201a- top corner spray position;

[0051] 202-marginal part;

[0052] 202b-Edge spray position;

[0053] 30-Camera. DETAILED DESCRIPTION

[0054] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0055] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0056] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0057] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] In the drawings of this article, direction X, direction Y and direction Z are perpendicular to each other, wherein direction Y represents the height direction from bottom to top.

[0059] Please refer to Figure 1 As shown, the photovoltaic module 20 includes a laminate 20a and a frame 20b, and the frame 20b is installed on the edge of the laminate 20a. The laminate 20a includes a photovoltaic glass, a first encapsulation film, a photovoltaic cell, a second encapsulation film and a back plate that are stacked in sequence. Alternatively, the laminate 20a includes a first photovoltaic glass, a first encapsulation film, a photovoltaic cell, a second encapsulation film and a second photovoltaic glass that are stacked in sequence. Among them, the laminate 20a and the frame 20b are connected by a sealant, and the sealant is used to prevent liquid or air from entering the interior of the laminate 20a, thereby reducing the possibility of corrosion, rust or oxidation of the internal structural parts of the laminate 20a. Therefore, the better the sealing reliability of the sealant, the higher the working reliability of the photovoltaic module 20, and the longer the service life of the photovoltaic module 20.

[0060] In the process of preparing the photovoltaic module 20, the uniformity of the sealant applied to different parts of the frame 20b may be different, which may cause a passage between the sealant and the laminate 20a (the passage can flow gas or liquid), a passage between the sealant and the frame 20b, and a passage inside the sealant. In particular, the sealant at the connection of two vertically connected frames 20b may be relatively uneven, which may easily lead to the existence of a passage at the connection of two vertically connected frames 20b. The above problems easily lead to a low degree of sealing reliability of the sealant. Therefore, after preparing the photovoltaic module 20, it is necessary to detect the sealing reliability of the sealant of the photovoltaic module 20.

[0061] The present application embodiment provides a photovoltaic module detection device, please refer to Figure 2 As shown, the detection device 10 includes an air pressure regulating box 1, an air pressure regulator 2 and a sprayer 3.

[0062] Please refer to Figure 2 As shown, the air pressure regulating box 1 is provided with a cavity 11, a first opening 12 and a second opening 13, the first opening 12 is connected with the second opening 13 through the cavity 11, and the air pressure regulating box 1 includes a detection station 14 with a certain height dimension, and the detection station 14 includes a step structure 141, and the step structure 141 is used to carry Figure 1 The frame 20b of the photovoltaic assembly 20 shown in the figure, the step structure 141 encloses the first opening 12. The air pressure regulator 2 is connected to the second opening 13, and the air pressure regulator 2 is used to make the second opening 13 and the cavity 11 in a negative pressure state. The sprayer 3 is installed on the air pressure regulating box 1 and is located outside the cavity 11, and the sprayer 3 is used to spray liquid.

[0063] Please refer to Figure 3As shown, after the photovoltaic module 20 is installed on the detection device 10, the sprayer 3 can be started, and the sprayer 3 sprays liquid to the top surface of the photovoltaic module 20 (the surface of the photovoltaic module 20 away from the cavity 11), and a certain amount of liquid will accumulate on the top surface of the photovoltaic module 20. In the process of starting the sprayer 3, the air pressure regulator 2 can also be started to make the air pressure in the cavity 11 lower than the air pressure outside the air pressure regulating box 1. If the photovoltaic module 20 has the passage described in the above content, under the action of the air pressure difference, the liquid on the top surface of the photovoltaic module 20 will flow to the bottom surface of the photovoltaic module 20 and the cavity 11 through the possible passage, that is, the liquid on the top surface of the photovoltaic module 20 will drip to the bottom of the photovoltaic module 20. The tester can detect the leakage sample values ​​such as the leakage amount, the leakage speed and the number of leakage positions to measure the sealing reliability of the sealant of the photovoltaic module 20. If the leakage sample value is less than the set value, it can be determined that the sealing reliability of the sealant of the photovoltaic module 20 meets the requirements under the current detection conditions. If the water leakage sample value is greater than or equal to the set value, it can be determined that the sealing reliability of the sealant of the photovoltaic module 20 does not meet the requirements under the current detection conditions. Therefore, the detection device 10 of the embodiment of the present application can be used to detect the sealing reliability of the sealant of the photovoltaic module 20.

[0064] Under the effect of the air pressure difference, the structure of the photovoltaic module 20 will also bend and deform into the cavity 11 (mainly the laminate 20a is deformed), and the laminate 20a and the frame 20b will be displaced relative to each other, so that the sealant bonded to the laminate 20a and the frame 20b is also deformed under force, further increasing the possibility of the passage, especially at the connection of two vertically connected frames 20b. Therefore, the detection device 10 of the embodiment of the present application can be used to detect the sealing reliability of the sealant under the condition that the photovoltaic module 20 is under load.

[0065] For further information, please refer to Figure 4 As shown, the detection device 10 may also include a blocking member 4, please refer to Figure 5 As shown, the blocking member 4 can be installed between the step side wall 141a of the step structure 141 and the side wall of the frame 20b, and the height of the blocking member 4 is greater than the height of the frame 20b. Under this setting, the blocking member 4 can block the liquid on the top surface of the photovoltaic module 20, so that a certain height of liquid is stored on the top surface of the photovoltaic module 20, and a certain height of liquid has a certain hydraulic pressure. Under the action of the hydraulic pressure, the liquid will flow to the bottom surface of the photovoltaic module 20 and the cavity 11 through the possible passage. Therefore, the detection device 10 with the blocking member 4 can also detect the sealing reliability of the sealant under the strip where a certain height of water accumulates on the top surface of the photovoltaic module 20.

[0066] Secondly, the blocking member 4 can also reduce the possibility of liquid flowing through the edge of the detection device 10 to the bottom of the detection device 10, so as to improve the cleanliness of the detection environment where the detection device 10 is located, and can recycle the liquid located on the top surface of the photovoltaic component 20 and the cavity 11 so that the liquid can be reused.

[0067] Please refer to Figure 5 As shown, the height dimension D1 of the blocking member 4 is ≥10 mm, and the height dimension D1 can specifically be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm or 50 mm. In short, the height dimension D1 of the blocking member 4 only needs to be greater than the thickness dimension of the photovoltaic component 20.

[0068] Also, please refer to Figure 5 As shown, the step bottom wall 141b of the step structure 141 serves as a frame 20b structure for supporting the photovoltaic module 20. The step bottom wall 141b has a certain degree of flatness so that the photovoltaic module 20 can be placed flat on the step structure 141, and when the air pressure regulator 2 is not activated, the angle between the top surface of the photovoltaic module 20 and the horizontal plane does not exceed 1°, so as to reduce the possibility that the liquid accumulates mainly in one of the top corners of the top surface of the photovoltaic module 20, so that the detection device 10 can reliably detect the sealing reliability of the sealant at different positions of the photovoltaic module 20.

[0069] When using the detection device 10 of the embodiment of the present application, the tester can test the sealing reliability of the sealant of the photovoltaic component 20 multiple times according to the same detection conditions, or the tester can test the sealing reliability of the sealant of the photovoltaic component 20 multiple times according to different detection conditions.

[0070] The inspector may calculate the water leakage sample value manually, or the inspector may calculate the water leakage sample value automatically using a computer.

[0071] Optionally, see Figure 6 As shown, the sprayer 3 includes four corner nozzles 31, and the inspection station 14 includes four corner stations 142. Each corner station 142 is equipped with a corresponding corner nozzle 31. The corner nozzle 31 is used to spray Figure 7 The corresponding top corner 201 in the photovoltaic module 20 is shown, and the top corner 201 is close to the connection between two vertically connected frames 20b. Therefore, the detection device 10 can effectively detect the sealing reliability of the sealant located at the connection between the two vertically connected frames 20b.

[0072] Among them, the position of the top corner portion 201 sprayed by the top corner nozzle 31 is as follows: Figure 7The top corner spray position 201a (dotted circle) is shown. There is a set distance L1 between the top corner spray position 201a and the first edge of the photovoltaic component 20, which satisfies 0mm≤L1≤50mm. The distance L1 can be 0mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm or 50mm. There is a set distance L2 between the top corner spray position 201a and the second edge (adjacent to and perpendicular to the first edge) of the photovoltaic component 20, which satisfies 0mm≤L2≤50mm. The distance L2 can be 0mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm or 50mm.

[0073] Optionally, see Figure 6 As shown, the sprayer 3 includes four edge nozzles 32, and the detection station 14 includes four edge stations 143. Each edge station 143 is equipped with a corresponding edge nozzle 32. The edge nozzle 32 is used to spray Figure 7 The corresponding edge portion 202 in the photovoltaic assembly 20 is shown. Therefore, the detection device 10 can effectively detect the sealing reliability of the sealant located on the same side frame 20b.

[0074] The position of the edge portion 202 sprayed by the edge position nozzle 32 is as follows: Figure 7 The edge spraying position 202a (dotted circle) shown corresponds to the middle part of the edge portion 202. During the detection process, since the deformation amount of the middle part of the edge portion 202 is larger than the deformation amount of other positions of the edge portion 202, the possibility of the existence of a passage of the sealant in the middle part of the edge portion 202 is greater. Therefore, the detection device 10 can effectively detect the sealing reliability of the sealant in the middle part of the edge portion 202.

[0075] The present application embodiment provides a photovoltaic module detection system, please refer to Figure 8 As shown, the photovoltaic module detection system includes a computer (not shown in the figure), a camera 30 and the detection device 10 described above.

[0076] The camera 30 is installed in the cavity 11 of the air pressure regulating box 1. The camera 30 is used to capture sample images (videos and / or images) in the cavity 11. The computer is data-connected to the camera 30. The computer is used to obtain the sample images captured by the camera 30. The computer can analyze the leakage sample values ​​based on the sample images, so as to quickly provide the inspector with relatively objective and relatively accurate values, thereby facilitating the inspector to quickly provide the inspector with the test results on the sealing reliability of the sealant of the photovoltaic component 20 currently being inspected.

[0077] Among them, the computer mainly uses image recognition algorithms, target feature detection algorithms and other algorithms to analyze the leakage sample values.

[0078] The embodiment of the present application provides a photovoltaic module detection method. The photovoltaic module detection system described above can detect the sealing reliability of the sealant of the photovoltaic module according to the detection method provided by the embodiment of the present application. The detection method provided by the embodiment of the present application includes:

[0079] Step S1: Install the photovoltaic module at the inspection station of the air pressure regulating box. Figure 8 As shown, the photovoltaic assembly 20 is installed in the air pressure regulating box 1.

[0080] Step S2: extracting the gas in the cavity of the air pressure regulating box to make the air pressure value of the cavity a first negative pressure value. Figure 8 As shown, the gas in the air pressure regulating box 1 is extracted using the air pressure regulator 2 to make the air pressure in the air pressure regulating box 1 lower than the air pressure outside the air pressure regulating box 1 , and the air pressure difference is used to apply a load on the photovoltaic module 20 , thereby deforming the local structure of the photovoltaic module 20 .

[0081] Step S3: spraying liquid onto the surface of the photovoltaic module that is away from the cavity. Figure 8 As shown, the sprayer 3 is used to spray liquid onto the top surface of the photovoltaic module 20. Step S2 and step S3 are performed synchronously.

[0082] Step S4: During the execution of steps S2 and S3, a camera placed in the cavity is used to capture an image of the sample. Figure 8 As shown, the camera 30 is used to capture sample images of the bottom surface of the photovoltaic module 20, so as to analyze the location of the water leakage point later, and / or the camera 30 is used to capture sample images of water dripping in the cavity 11, so as to analyze the water leakage speed and water leakage amount later. The embodiment of the present application does not limit the number of cameras 30 installed and the installation position in the cavity 11, and the embodiment of the present application does not limit the installation angle of the camera 30 in the cavity 11.

[0083] Step S5: Obtain sample images using a computer and calculate the leakage sample value (leakage amount, leakage speed, number of leakage locations or other leakage characteristic values) using a computer according to the sample images. If at least one leakage sample value is greater than or equal to the corresponding first set value, for example, the leakage amount is greater than or equal to the first set leakage amount, the leakage speed is greater than or equal to the first set leakage speed, and the number of leakage locations is greater than or equal to the first set leakage location number, then the current detection process can be stopped, and it is determined that the sealing reliability of the sealant of the detected photovoltaic component 20 under the current detection conditions does not meet the requirements. If at least one leakage sample value is less than the corresponding first set value, for example, the leakage amount is less than the first set leakage amount, the leakage speed is less than the first set leakage speed, and the number of leakage locations is less than the first set leakage location number, then it can be determined that the sealing reliability of the sealant of the detected photovoltaic component 20 under the current detection conditions meets the requirements, and accordingly, the next step can be executed to detect the sealing reliability of the sealant under other conditions.

[0084] Step S6: Set the air pressure value of the cavity to a second negative pressure value, wherein the absolute value P2 of the second negative pressure value is greater than the absolute value P1 of the first negative pressure value. Figure 8 As shown, the air volume of the air pressure regulator 2 per unit time is increased to make the air pressure value in the cavity 11 lower, wherein, when the air pressure in the cavity 11 is the second negative pressure value, steps S3, S4 and S5 are also continuously executed to detect the sealing reliability of the sealant when the photovoltaic module 20 is subjected to a greater load. If at least one water leakage sample value is greater than or equal to the second set value, for example, the water leakage amount is greater than or equal to the second set water leakage amount, the water leakage speed is greater than or equal to the second set water leakage speed, and the number of water leakage positions is greater than or equal to the second set water leakage position number, the current detection process can be stopped, and it is determined that the sealing reliability of the sealant of the detected photovoltaic module 20 under the current detection conditions does not meet the requirements. If at least one leakage sample value is less than the second set value, for example, the leakage amount is less than the second set leakage amount, the leakage speed is less than the second set leakage speed, and the number of leakage locations is less than the second set number of leakage locations, then it can be determined that the sealing reliability of the sealant of the photovoltaic component 20 being tested under the current testing conditions meets the requirements. Accordingly, the tester can execute the next step to test the sealing reliability of the sealant under other conditions.

[0085] Step S7: Set the air pressure value of the cavity to a third negative pressure value, wherein the absolute value P3 of the third negative pressure value is greater than the absolute value P2 of the second negative pressure value. Figure 8As shown, the air extraction volume per unit time of the air pressure regulator 2 is further increased to make the air pressure value in the cavity 11 lower, wherein, when the air pressure in the cavity 11 is a third negative pressure value, steps S3, S4 and S5 are also continuously executed to detect the sealing reliability of the sealant when the photovoltaic module 20 is subjected to a greater load.

[0086] Through Fig. 9 The method shown can detect the sealing reliability of the sealant of the photovoltaic module under different test conditions, so that the sealing reliability of the photovoltaic module can be graded. For example, if the sealing reliability of the sealant of the photovoltaic module does not meet the requirements when the test condition is a first negative pressure value, it can be determined that the quality of the photovoltaic module does not meet the basic requirements; if the sealing reliability of the sealant of the photovoltaic module meets the requirements when the test condition is a first negative pressure value, but the sealing reliability of the sealant of the photovoltaic module does not meet the requirements when the test condition is a second negative pressure value, it can be determined that the quality of the photovoltaic module meets the corresponding waterproof grade; if the sealing reliability of the sealant of the photovoltaic module meets the requirements when the test condition is a first negative pressure value, and the sealing reliability of the sealant of the photovoltaic module does not meet the requirements when the test condition is a second negative pressure value, it can be determined that the quality of the photovoltaic module meets the corresponding waterproof grade. If the sealing reliability of the sealant of the photovoltaic module meets the requirements when the test condition is the second negative pressure value, but the sealing reliability of the sealant of the photovoltaic module does not meet the requirements when the test condition is the third negative pressure value, then the quality of the photovoltaic module can be determined to meet another corresponding waterproof level; if the sealing reliability of the sealant of the photovoltaic module meets the requirements when the test condition is the first negative pressure value, and the sealing reliability of the sealant of the photovoltaic module also meets the requirements when the test condition is the second negative pressure value, and the sealing reliability of the sealant of the photovoltaic module also meets the requirements when the test condition is the third negative pressure value, then the quality of the photovoltaic module can be determined to meet another corresponding waterproof level. By testing photovoltaic modules step by step, it is convenient for the inspector to quickly classify defective products that do not meet the basic requirements and good products that meet different waterproof levels.

[0087] like Fig. 9 The detection method of the embodiment of the present application shown can detect the status of the photovoltaic module under two different negative pressure values ​​at least twice, and the absolute value of the negative pressure value in the latter detection process must be greater than the absolute value of the negative pressure value in the previous detection process. Specifically, the tester can choose to detect twice, three times, or other times greater than three times.

[0088] Optionally, in step S6, the difference between the absolute value P2 and the absolute value P1 is P 21 , satisfying 500Pa≤P 21 ≤700Pa. 21Specifically, it can be 500Pa, 510Pa, 520Pa, 530Pa, 540Pa, 550Pa, 560Pa, 570Pa, 580Pa, 590Pa, 600Pa, 610Pa, 620Pa, 630Pa, 640Pa, 650Pa, 660Pa, 670Pa, 680Pa, 690Pa or 700Pa.

[0089] If P 21 Too small, for example, P 21 Less than 500Pa, since the two testing conditions are similar, the difference between the quality of the photovoltaic module 20 that meets the requirements only under the previous testing conditions and the quality of the photovoltaic module 20 that meets the requirements under the two different testing conditions is small, and the distinction is not meaningful. 21 Too large, such as P 21 Greater than 700Pa, the number of photovoltaic modules 20 that meet the requirements only under the previous test condition is large, while the number of photovoltaic modules 20 that meet the requirements under two different test conditions is small. However, in fact, the quality differences between the photovoltaic modules 20 that meet the requirements only under the previous test condition are also large. 21 It is better in the range of 500Pa ~ 700Pa.

[0090] Optionally, in step S7, the difference between the absolute value P3 and the absolute value P2 is P 32 , satisfying 500Pa≤P 32 ≤700Pa. 32 Specifically, it can be 500Pa, 510Pa, 520Pa, 530Pa, 540Pa, 550Pa, 560Pa, 570Pa, 580Pa, 590Pa, 600Pa, 610Pa, 620Pa, 630Pa, 640Pa, 650Pa, 660Pa, 670Pa, 680Pa, 690Pa or 700Pa.

[0091] If P 32 Too small, for example, P 32 Less than 500Pa, since the two testing conditions are similar, the difference between the quality of the photovoltaic module 20 that meets the requirements only under the previous testing conditions and the quality of the photovoltaic module 20 that meets the requirements under the two different testing conditions is small, and the distinction is not meaningful. 32 Too large, such as P 32 Greater than 700Pa, the number of photovoltaic modules 20 that meet the requirements only under the previous test condition is large, while the number of photovoltaic modules 20 that meet the requirements under two different test conditions is small. However, in fact, the quality differences between the photovoltaic modules 20 that meet the requirements only under the previous test condition are also large.32 It is better in the range of 500Pa ~ 700Pa.

[0092] Optionally, when the air pressure value of the cavity 11 is the first negative pressure value and the water leakage sample value is less than the first set value, the time for executing step S3, step S4 and step S5 is at least one hour. That is, before the water leakage sample value is greater than or equal to the first set value, it is necessary to spray liquid on the top surface of the photovoltaic module 20 for at least one hour, take sample images for at least one hour, and use a computer to calculate the water leakage sample value for at least one hour. The result detected under the current detection condition is more reliable than the instantaneous detection result.

[0093] Optionally, when the air pressure value of the cavity 11 is the second negative pressure value and the water leakage sample value is less than the second set value, the time for executing step S3, step S4 and step S5 is at least one hour. That is, before the water leakage sample value is greater than or equal to the second set value, it is necessary to spray liquid on the top surface of the photovoltaic module 20 for at least one hour, take sample images for at least one hour, and use a computer to calculate the water leakage sample value for at least one hour. The result detected under the current detection condition is more reliable than the instantaneous detection result.

[0094] Optionally, when the air pressure value of the cavity 11 is the third negative pressure value and the water leakage sample value is less than the third set value, the time for executing step S3, step S4 and step S5 is at least one hour. That is, before the water leakage sample value is greater than or equal to the third set value, it is necessary to spray liquid on the top surface of the photovoltaic module 20 for at least one hour, take sample images for at least one hour, and calculate the water leakage sample value using a computer for at least one hour. The result detected under the current detection condition is more reliable than the instantaneous detection result.

[0095] Optionally, regarding the same water leakage characteristic, the first set value, the second set value and the third set value may be the same or different.

[0096] Optionally, the method of step S1 further includes: using waterproof glue to seal the frame 20b of the photovoltaic module 20 and the detection station 14, so that there is no passage for gas circulation between the frame 20b and the detection station 14, so that the air pressure in the cavity 11 can reliably approach a set value, so that the detection result is relatively accurate. Accordingly, the waterproof glue needs to maintain good adhesion under the condition of contact with liquid, so as to effectively seal the frame 20b and the detection station 14.

[0097] If a stopper 4 is provided between the frame 20b and the detection station 14, the frame 20b of the photovoltaic module 20 and the stopper 4 can be sealed and connected with waterproof glue, and the detection station 14 and the stopper 4 can be sealed and connected with waterproof glue.

[0098] In other embodiments, the inspector may not activate the air pressure regulator 2 to inspect the sealing reliability of the sealant of the photovoltaic assembly 20 when the photovoltaic assembly 20 is not subjected to air pressure load.

[0099] In other embodiments, the tester may also periodically change the rotation direction of the fan blades in the air pressure regulator 2 so that the air pressure in the cavity 11 periodically alternates between positive pressure and negative pressure, so as to detect the sealing reliability of the sealant of the photovoltaic module 20 when the photovoltaic module 20 is subjected to air pressure loads in two different directions and periodically alternating.

[0100] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting a photovoltaic module, characterized in that: The detection method comprises: Step S1: installing the photovoltaic module at the inspection station of the air pressure regulating box; Step S2: extracting the gas in the cavity of the air pressure regulating box so that the air pressure value of the cavity is a first negative pressure value; Step S3: spraying liquid onto the surface of the photovoltaic module facing away from the cavity; Step S4: During the execution of step S2 and step S3, a camera placed in the cavity is used to capture an image of the sample; Step S5: using a computer to acquire the sample image and using the computer to calculate a water leakage sample value according to the sample image; If the water leakage sample value is greater than or equal to the first set value, stop the current detection process; If the water leakage sample value is less than the first set value, executing step S6: setting the air pressure value of the cavity to a second negative pressure value, wherein the absolute value P2 of the second negative pressure value is greater than the absolute value P1 of the first negative pressure value.

2. The photovoltaic module detection method according to claim 1, characterized in that: The detection method further comprises: If the water leakage sample value is greater than the second set value, stop the current detection process; If the water leakage sample value is less than the second set value, executing step S7: setting the air pressure value of the cavity to a third negative pressure value, wherein the absolute value P3 of the third negative pressure value is greater than the absolute value P2 of the second negative pressure value.

3. The photovoltaic module detection method according to claim 2, characterized in that: The detection method further comprises: If the water leakage sample value is greater than the third set value, stop the current detection process; If the water leakage sample value is less than the third set value and the air pressure in the cavity is the third negative pressure value, the time for executing step S3, step S4 and step S5 is at least one hour.

4. The photovoltaic module detection method according to any one of claims 1 to 3, characterized in that: In step S6, the difference between the absolute value P2 and the absolute value P1 is P 21 , satisfying 500Pa≤P 21 ≤700Pa.

5. The photovoltaic module detection method according to claim 2 or 3, characterized in that: In step S7, the difference between the absolute value P3 and the absolute value P2 is P 32 , satisfying 500Pa≤P 32 ≤700Pa.

6. The photovoltaic module detection method according to any one of claims 1 to 3, characterized in that: Under the condition that the air pressure value of the cavity is the first negative pressure value and the water leakage sample value is less than the first set value, the time for performing step S3, step S4 and step S5 is at least one hour; And / or, under the condition that the air pressure value of the cavity is the second negative pressure value and the water leakage sample value is less than the second set value, the time for executing step S3, step S4 and step S5 is at least one hour.

7. The photovoltaic module detection method according to any one of claims 1 to 3, characterized in that: The step S1 further includes: using waterproof glue to seal and connect the frame of the photovoltaic module and the inspection station.

8. A photovoltaic module detection device, characterized in that: The photovoltaic module detection device is used to detect the photovoltaic module according to the photovoltaic module detection method of any one of claims 1 to 7, and the photovoltaic module detection device comprises: An air pressure regulating box is provided with a cavity, a first opening and a second opening, the first opening is communicated with the second opening through the cavity, the air pressure regulating box comprises a detection station, the detection station comprises a step structure, the step structure is used to carry the frame of the photovoltaic module, and the step structure encloses and forms the first opening; an air pressure regulator, connected to the second opening, and used for adjusting the air pressure in the cavity; a sprayer, mounted on the air pressure regulating box and located outside the cavity, the sprayer being used to spray liquid onto a surface of the photovoltaic module that is away from the cavity; The blocking member is used to be installed between the side wall of the step structure and the side wall of the frame, and the blocking member has a set height dimension D1, satisfying D1≥10mm.

9. The photovoltaic module detection device according to claim 8, characterized in that: The sprayer includes four top corner nozzles, the inspection station includes four top corner stations, each of the top corner stations is equipped with a corresponding top corner nozzle, and the top corner nozzle is used to spray the corresponding top corner part of the photovoltaic module; And / or, the sprayer includes four edge nozzles, the inspection station includes four edge stations, each edge station is installed with a corresponding edge nozzle, and the edge nozzle is used to spray the corresponding edge portion of the photovoltaic component.

10. A photovoltaic module detection system, characterized in that: include: A photovoltaic module detection device, which is the photovoltaic module detection device according to claim 8 or 9; A camera installed in the cavity of the air pressure regulating box, and the camera is used to capture sample images; A computer is data-connected to the camera, and the computer is used to obtain the sample image.

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