An online detection device and method for light conversion film of photovoltaic module

Abstract

This invention discloses an online inspection device and method for the light conversion film of photovoltaic modules. The online inspection device includes a conveyor roller, an inspection cover, multiple top excitation light source units, multiple top signal acquisition units, multiple edge excitation light source units, multiple edge signal acquisition units, and a processing unit. The conveyor roller is used to transport photovoltaic modules along a first horizontal direction; the inspection cover has an openable and closable inlet / outlet on its side wall along the first horizontal direction; the top excitation light source units and top signal acquisition units are both located on the top inner wall of the inspection cover and are used to project a first wavelength of light onto the photovoltaic modules inside the inspection cover; the edge excitation light source units and edge signal acquisition units are both located on the inner side wall of the inspection cover along a second horizontal direction and are used to collect the second wavelength of light projected by the photovoltaic modules inside the inspection cover. This online inspection device achieves accurate inspection of non-transparent photovoltaic modules without blind spots, breaking through the dependence of traditional through-type inspection on transparent photovoltaic modules.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic module technology, and in particular to an online testing device and method for the light conversion film of a photovoltaic module. Background Technology

[0002] In the field of photovoltaic technology, light conversion film (PDC) is a functional material that can significantly improve the photoelectric conversion efficiency of photovoltaic modules. Its mechanism involves absorbing ultraviolet light and converting it into visible light that can be effectively utilized by the solar cells. Therefore, the PDC and its uniformity directly determine the final power generation performance of the module. With the rapid development of photovoltaic technologies such as crystalline silicon and perovskite, PDC has been widely used in various non-transparent photovoltaic modules. Structurally, a typical photovoltaic module is a multi-layered composite structure, usually composed of glass, PDC, encapsulating film, solar cells, and a backsheet, laminated sequentially. The solar cells and backsheet are both non-transparent materials, completely blocking the penetrating propagation of light. However, current online testing technologies for PDC performance are mainly based on the traditional through-beam design, relying on light penetrating the entire module to collect spectral signals. This testing mode is only suitable for transparent or semi-transparent samples. When dealing with non-transparent photovoltaic modules, the light-blocking effect of the solar cells and backsheet completely blocks the signal acquisition path, making testing ineffective and making it difficult to quantify PDC and its uniformity.

[0003] Furthermore, existing technologies have the following drawbacks in practical applications: First, the detection principle is incompatible with the component structure, and the penetration-type solution cannot fundamentally adapt to the physical characteristics of non-transparent components. Second, the production site has complex environmental factors such as natural light, stray light from equipment, and electromagnetic interference, while existing detection systems lack targeted anti-interference design, resulting in detection errors typically exceeding ±8%, which is difficult to meet quality control requirements. Third, existing detection schemes do not fully consider the continuous conveying characteristics of photovoltaic module production lines, and the detection speed is generally too low to match the conventional speed of 10m / min on the production line. Fourth, some detection methods use contact acquisition methods, which can easily scratch the surface of the component glass or damage the laminated structure, directly affecting the yield of finished products. Fifth, in terms of data processing, traditional algorithms rely only on simple signal difference judgment or fixed coefficient calibration, which cannot eliminate signal fluctuations caused by cell shading, nor can they adapt to the structural differences of different component specifications. They often require repeated manual calibration, which is not only inefficient but also further amplifies the detection error. Summary of the Invention

[0004] This invention provides an online detection device and method for the light conversion film of photovoltaic modules, which realizes accurate detection of non-transparent photovoltaic modules without blind spots, breaking through the dependence of traditional penetration detection on transparent photovoltaic modules.

[0005] In a first aspect, the present invention provides an online detection device for the light conversion film of a photovoltaic module, wherein the photovoltaic module comprises a backsheet, a first encapsulating film, multiple solar cells, a second encapsulating film, a light conversion film, and transparent glass stacked sequentially; the online detection device comprises: a conveyor roller, a detection cover, multiple top excitation light source units, multiple top signal acquisition units, multiple edge excitation light source units, multiple edge signal acquisition units, and a processing unit. The photovoltaic module is located on the conveyor roller conveyor, which is used to convey the photovoltaic module along a first horizontal direction; The detection cover has an openable and closable entrance / exit on its side wall along the first horizontal direction; The top excitation light source unit and the top signal acquisition unit are both located on the top inner wall of the detection cover, and the edge excitation light source unit and the edge signal acquisition unit are both located on the inner side wall of the detection cover along the second horizontal direction; wherein, the second horizontal direction intersects with the first horizontal direction; The processing unit is connected to both the plurality of top excitation light source units and the plurality of edge excitation light source units, and is used to control the plurality of top excitation light source units to project a first wavelength light onto the upper surface of the photovoltaic module, and to control the plurality of edge excitation light source units to project a first wavelength light onto the edge of the photovoltaic module. The light conversion film is used to receive the first wavelength light and convert the first wavelength light into the second wavelength light; The processing unit is also connected to the plurality of top signal acquisition units, and is used to control the plurality of top signal acquisition units to detect the intensity of the second wavelength light projected by the plurality of first detection points on the upper surface of the photovoltaic module, and generate a first top light intensity signal. The processing unit is also connected to the plurality of edge signal acquisition units, and is used to control the plurality of edge signal acquisition units to detect the intensity of the second wavelength light projected by the plurality of second detection points on the edge of the photovoltaic module, and generate a first side luminescence intensity signal; wherein any one of the second detection points and at least one of the first detection points are located in the same vertical plane, and the vertical plane is perpendicular to the first horizontal direction; The processing unit is also connected to the plurality of top signal acquisition units and the plurality of edge signal acquisition units, and is used to determine the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the first top light intensity signal and the first side light intensity signal.

[0006] Optionally, the plurality of top signal acquisition units are arranged in n columns along the first horizontal direction and in m rows along the second horizontal direction on the top inner wall of the detection cover; wherein n and m are both positive integers greater than or equal to 1. The plurality of edge signal acquisition units include n first edge signal acquisition units and n second edge signal acquisition units; The n first edge signal acquisition units and the n second edge signal acquisition units are respectively located on two opposite inner sidewalls of the detection cover along the second horizontal direction; the i-th first edge signal acquisition unit, the i-th second edge signal acquisition unit and the i-th column of the top signal acquisition unit are located in the same vertical plane; where i is a positive integer from 1 to n; The processing unit is connected to the n first edge signal acquisition units and is used to control the n first edge signal acquisition units to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module, and generate a second side luminescence intensity signal. The processing unit is also connected to the n second edge signal acquisition units, and is used to control the n second edge signal acquisition units to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module, and generate a third side luminous intensity signal. The processing unit is further configured to determine the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal and the third side efflux intensity signal.

[0007] Optionally, the processing unit is further configured to control the plurality of top signal acquisition units, the n first edge signal acquisition units, and the n second edge signal acquisition units to detect the ambient background light intensity inside the detection cover and generate an ambient background light signal when none of the plurality of top excitation light source units and the plurality of edge excitation light source units project the first wavelength light. The processing unit is further configured to determine the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, the third side efflux intensity signal and the ambient background light signal.

[0008] Optionally, it also includes a cleaning module located on the side of the detection cover opposite to the first horizontal direction; The cleaning module includes a high-pressure nitrogen purging unit and a soft brush unit; The high-pressure nitrogen purging unit is used to remove dust from the surface of the photovoltaic module; the soft brush unit is used to clean residual impurities on the surface of the photovoltaic module.

[0009] Optionally, the processing unit is further configured to determine that the photovoltaic module is qualified when the conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and the uniformity is less than or equal to a preset uniformity threshold; It is also used to determine that the photovoltaic module is unqualified when the conversion efficiency is less than the preset conversion efficiency qualification threshold or the uniformity is greater than the preset uniformity threshold.

[0010] Optionally, it further includes an alarm unit and a data storage unit; the processing unit is connected to the alarm unit and the data storage unit respectively; The processing unit is used to generate an alarm signal when the photovoltaic module is determined to be defective; The alarm unit is used to trigger an alarm when the alarm signal is received; The processing unit is used to generate a storage signal when the photovoltaic module is determined to be qualified; The data storage unit is used to obtain and store the conversion efficiency and uniformity corresponding to the photovoltaic module when the storage signal is received.

[0011] Optionally, the inner wall of the detection cover is lined with a matte black light-absorbing material; and / or, The irradiance of the plurality of top excitation light source units is 1.0~2.0 mW / cm². 2 ; and / or, The plurality of top excitation light source units all illuminate the photovoltaic module at an angle, and the angle between the first wavelength light projected and the surface of the photovoltaic module is 25°~35°.

[0012] Optionally, the first wavelength range is 280-400nm; the second wavelength range is 500-700nm.

[0013] Optionally, it also includes a lifting drive unit; the lifting drive unit is connected to the detection cover and is used to adjust the distance between the detection cover and the conveyor roller in the vertical direction, and to control the opening and closing of the openable inlet and outlet, so that the photovoltaic module can be detected inside the detection cover.

[0014] Secondly, the present invention also provides an online detection method for the light conversion film of a photovoltaic module, which is performed using the online detection device for the light conversion film of a photovoltaic module as described in any of the first aspects, wherein the online detection method includes a detection process; the detection process includes: Control the plurality of top excitation light source units to project a first wavelength of light onto the upper surface of the photovoltaic module; Control the plurality of edge excitation light source units to project a first wavelength of light onto the edge of the photovoltaic module; The multiple top signal acquisition units are controlled to detect the intensity of the second wavelength light projected from multiple first detection points on the upper surface of the photovoltaic module, and generate a first top light intensity signal. The plurality of edge signal acquisition units are controlled to detect the intensity of the second wavelength light projected by a plurality of second detection points on the edge of the photovoltaic module, and generate a first side luminescence intensity signal; wherein any one of the second detection points and at least one of the first detection points are located in the same vertical plane, and the vertical plane is perpendicular to the first horizontal direction; Based on the known dynamic calibration coefficient, the first top light intensity signal, and the first side eclipse intensity signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined.

[0015] Optionally, the plurality of top signal acquisition units are arranged in n columns along the first horizontal direction and in m rows along the second horizontal direction on the top inner wall of the detection cover; where n and m are both positive integers greater than or equal to 1; the plurality of edge signal acquisition units include n first edge signal acquisition units and n second edge signal acquisition units; the n first edge signal acquisition units and the n second edge signal acquisition units are respectively located on two opposite inner sidewalls of the detection cover along the second horizontal direction; the i-th first edge signal acquisition unit, the i-th second edge signal acquisition unit and the i-th column of the top signal acquisition units are located in the same vertical plane; where i is a positive integer from 1 to n; Controlling the plurality of edge signal acquisition units to detect the intensity of the second wavelength light projected from a plurality of second detection points on the edge of the photovoltaic module, and generating a first side luminescence intensity signal, includes: The n first edge signal acquisition units are controlled to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module, and a second side luminescence intensity signal is generated. The n second edge signal acquisition units are controlled to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module, and a third side luminescence intensity signal is generated. Based on the known dynamic calibration coefficients, the first top light intensity signal, and the first side efflux intensity signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined, including: Based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, and the third side efflux intensity signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined.

[0016] Optionally, before determining the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, and the third side efflux intensity signal, the method further includes: Acquire the ambient background light signals output by the plurality of top signal acquisition units, the n first edge signal acquisition units, and the n second edge signal acquisition units; Based on the known dynamic calibration coefficients, the first top light intensity signal, the second side efflux intensity signal, and the third side efflux intensity signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined, including: Based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, the third side efflux intensity signal, and the ambient background light signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined.

[0017] Optionally, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, the third side efflux intensity signal, and the ambient background light signal, including: The first top light intensity signal, the second side emanating light intensity signal, and the third side emanating light intensity signal are all subjected to noise reduction processing to obtain the second top light intensity signal, the fourth side emanating light intensity signal, and the fifth side emanating light intensity signal, respectively. The second top light intensity signal, the fourth side emitting light intensity signal, and the fifth side emitting light intensity signal are all corrected to obtain the third top light intensity signal, the sixth side emitting light intensity signal, and the seventh side emitting light intensity signal, respectively. Based on the known dynamic calibration coefficient, the third top light intensity signal, the sixth side luminous intensity signal, the seventh side luminous intensity signal, and the ambient background light signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined.

[0018] Optionally, noise reduction processing is performed on the first top light intensity signal, the second side emitting light intensity signal, and the third side emitting light intensity signal to obtain the second top light intensity signal, the fourth side emitting light intensity signal, and the fifth side emitting light intensity signal, respectively, including: Variational mode decomposition is performed on the first top light intensity signal, the second side efflux intensity signal, and the third side efflux intensity signal to generate multiple corresponding intrinsic mode functions. Calculate the envelope entropy and sample entropy of each intrinsic mode function, and calculate the composite entropy corresponding to each intrinsic mode function by weighted summation; Remove the intrinsic mode function corresponding to the maximum value of the composite entropy, and reconstruct the remaining intrinsic mode functions to obtain the second top light intensity signal, the fourth side luminous intensity signal, and the fifth side luminous intensity signal, respectively.

[0019] Optionally, the second top light intensity signal, the fourth side emitting light intensity signal, and the fifth side emitting light intensity signal are all corrected to obtain the third top light intensity signal, the sixth side emitting light intensity signal, and the seventh side emitting light intensity signal, respectively, including: The cell regions in the photovoltaic module are determined based on the preset cell characteristic threshold, the second top light intensity signal, the fourth side luminous intensity signal, and the fifth side luminous intensity signal. The second top light intensity signal located at the first detection point within the battery cell area is subjected to weighted smoothing processing to obtain the third top light intensity signal; The fourth-side luminescence intensity signal and the fifth-side luminescence intensity signal located at the second detection point within the cell area are weighted and smoothed to obtain the sixth-side luminescence intensity signal and the seventh-side luminescence intensity signal.

[0020] Optionally, determining the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the third top light intensity signal, the sixth side efflux intensity signal, the seventh side efflux intensity signal, and the ambient background light signal includes: The ambient background light signal intensity is obtained by calculating the average value of the ambient background light signals output by the plurality of top signal acquisition units, the n first edge signal acquisition units, and the n second edge signal acquisition units. Based on the third top light intensity signal, determine the reflected light intensity at the first detection point corresponding to the surface of the photovoltaic module; The average value of the sixth-side luminescence intensity signal and the seventh-side luminescence intensity signal corresponding to the second detection point located in the same vertical plane as the first detection point on the surface of the photovoltaic module is calculated to obtain the side luminescence signal intensity. The conversion efficiency of the light conversion film at each of the first detection points on the surface of the photovoltaic module is calculated according to the formula q=k×(Isc+Ied-Ib); where q is the conversion efficiency, k is the known dynamic calibration coefficient, Isc is the reflected light intensity at any detection point on the surface of the photovoltaic module, Ied is the side efflux signal intensity corresponding to the column where any detection point on the surface of the photovoltaic module is located, and Ib is the ambient background light signal intensity. Calculate a first difference in the conversion efficiency of two adjacent first detection points within the cell area, and calculate a second difference in the conversion efficiency of two adjacent first detection points outside the cell area, and take the maximum value of the first difference and the second difference as the uniformity of the light conversion film.

[0021] Optionally, after determining the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the first top light intensity signal, and the plurality of first side effusive light intensity signals, the method further includes: The photovoltaic module is deemed qualified when the conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and the uniformity is less than or equal to a preset uniformity threshold. The photovoltaic module is deemed unqualified when the conversion efficiency is less than the preset conversion efficiency qualification threshold or the uniformity is greater than the preset uniformity threshold.

[0022] Optionally, the online detection device further includes an alarm unit and a data storage unit; the processing unit is connected to the alarm unit and the data storage unit respectively. After determining that the photovoltaic module is qualified when the conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and the uniformity is less than or equal to a preset uniformity threshold, the method further includes: Obtain the specification information of the current photovoltaic module; store the conversion efficiency and uniformity of the current photovoltaic module and their corresponding specification information in the data storage unit; After determining that the photovoltaic module is unqualified when the conversion efficiency is less than the preset conversion efficiency pass threshold or the uniformity is greater than the preset uniformity threshold, the method further includes: The alarm unit is controlled to trigger an alarm.

[0023] Optionally, the online detection method further includes a calibration process, which is performed before the detection process, and the calibration process includes: Obtain standard specification information for multiple photovoltaic standard components; Based on the standard specification information, determine the standard dynamic calibration coefficient corresponding to each photovoltaic standard component; Based on the standard specification information and the standard dynamic calibration coefficient, a dynamic standard coefficient corresponding to the photovoltaic module with arbitrary specification information is generated.

[0024] Optionally, the online detection method further includes a testing process, which is located between the calibration process and the detection process; the testing process includes: The plurality of top excitation light source units and the plurality of edge excitation light source units are controlled to project a first wavelength of light onto the upper surface and edge of the photovoltaic standard component, respectively; Acquire the first top light intensity signal output by the plurality of top signal acquisition units; Acquire the first-side luminous intensity signal output by the plurality of edge signal acquisition units; Obtain the standard specification information and standard dynamic calibration coefficient corresponding to the photovoltaic standard component; Calculate the test dynamic calibration coefficient based on the first top light intensity signal, the first side emanating light intensity signal, and the standard specification information; Calculate the third difference between the test dynamic calibration coefficient and the standard dynamic calibration coefficient, and determine that the third difference is less than a preset test difference.

[0025] This invention provides an online inspection device and method for the light conversion film of photovoltaic modules. By combining a top excitation light source unit and an edge excitation light source unit, the problem of insufficient excitation in the central area of ​​non-transparent modules caused by the obstruction of the traditional transmission light path is effectively solved, ensuring that the light conversion film is uniformly excited throughout the entire module. Simultaneously, by using dual-path collaborative acquisition of the top signal acquisition unit and the edge signal acquisition unit, the signal loss that may exist in a single path is compensated for, achieving accurate detection of the entire non-transparent photovoltaic module without blind spots, breaking through the dependence of traditional through-type inspection on transparent photovoltaic modules. Furthermore, during the inspection process, the top excitation light source unit, the edge excitation light source unit, the top signal acquisition unit, and the edge signal acquisition unit do not come into contact with the photovoltaic module, completely avoiding glass scratches or lamination structure damage that may be caused by physical contact, effectively ensuring the quality of the finished photovoltaic module.

[0026] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of an online detection device for the light conversion film of a photovoltaic module provided in an embodiment of the present invention; Figure 2 A cross-sectional view of the inside of the detection hood, perpendicular to the first horizontal direction, provided in an embodiment of the present invention; Figure 3 A cross-sectional view inside the detection hood, perpendicular to the second horizontal direction, provided in an embodiment of the present invention; Figure 4 A schematic flowchart of an online detection method for the light conversion film of a photovoltaic module provided in an embodiment of the present invention; Figure 5 A schematic flowchart of another online detection method for the light conversion film of a photovoltaic module provided in an embodiment of the present invention; Figure 6 A schematic flowchart illustrating another online detection method for the light conversion film of a photovoltaic module provided in an embodiment of the present invention; Figure 7 A schematic flowchart illustrating another online detection method for the light conversion film of a photovoltaic module provided in an embodiment of the present invention; Figure 8 A schematic flowchart illustrating another online detection method for the light conversion film of a photovoltaic module provided in an embodiment of the present invention; Figure 9 A schematic flowchart illustrating another online detection method for the light conversion film of a photovoltaic module provided in an embodiment of the present invention; Figure 10 This is a schematic flowchart of another online detection method for the light conversion film of a photovoltaic module provided in an embodiment of the present invention. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0030] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0032] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0033] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0034] Figure 1 This is a schematic diagram of the structure of an online testing device for the light conversion film of a photovoltaic module provided in an embodiment of the present invention. Figure 2 This is a cross-sectional view of the detection hood perpendicular to the first horizontal direction provided in an embodiment of the present invention. Figure 3 This is a cross-sectional view of the detection hood perpendicular to the second horizontal direction provided in an embodiment of the present invention, such as... Figure 1 , Figure 2 and Figure 3As shown, the photovoltaic module 1 includes a backsheet 11, a first encapsulating film 131, multiple solar cells 12, a second encapsulating film 132, a light conversion film 14, and a transparent glass 15, which are stacked sequentially. The online inspection device includes a conveyor roller 2, an inspection cover 3, multiple top excitation light source units 4, multiple top signal acquisition units 5, multiple edge excitation light source units 6, multiple edge signal acquisition units 7, and a processing unit (not shown in the figure). The photovoltaic module 1 is located on the conveyor roller 2, which is used to convey the photovoltaic module 1 along a first horizontal direction x. The inspection cover 3 has an openable inlet / outlet on its side wall along the first horizontal direction x. The top excitation light source units 4 and the top signal acquisition units 5 are both located on the top inner wall of the inspection cover 3, and the edge excitation light source units 6 and the edge signal acquisition units 7 are both located on the inner side wall of the inspection cover 3 along a second horizontal direction z, wherein the second horizontal direction z intersects with the first horizontal direction x.

[0035] The processing unit is connected to multiple top excitation light source units 4 and multiple edge excitation light source units 6, and is used to control the multiple top excitation light source units 4 to project a first wavelength light onto the upper surface of the photovoltaic module 1, and to control the multiple edge excitation light source units 6 to project a first wavelength light onto the edge of the photovoltaic module 1. A light conversion film 14 is used to receive the first wavelength light and convert it into a second wavelength light. The processing unit is also connected to multiple top signal acquisition units 5, and is used to control the multiple top signal acquisition units 5 to detect the intensity of the second wavelength light projected onto multiple first detection points on the upper surface of the photovoltaic module 1, and to generate a first top light intensity signal. The processing unit is also connected to multiple edge signal acquisition units 7, and is used to control the multiple edge signal acquisition units 7 to detect the intensity of the second wavelength light projected onto multiple second detection points on the edge of the photovoltaic module 1, and to generate a first side flare intensity signal. Wherein, any second detection point and at least one first detection point are located in the same vertical plane, and the vertical plane is perpendicular to the first horizontal direction x. The processing unit is also connected to multiple top signal acquisition units 5 and multiple edge signal acquisition units 7, and is used to determine the conversion efficiency of the light conversion film 14 and the uniformity of the light conversion film 14 at each first detection point based on the known dynamic calibration coefficient, the first top light intensity signal and the first side light intensity signal.

[0036] like Figure 1The online testing device shown can be arranged along the photovoltaic module production line and is set after the lamination process and before the framing process corresponding to the photovoltaic module. The photovoltaic module 1 includes a backsheet 11, a first encapsulating film 131, multiple solar cells 12, a second encapsulating film 132, a light conversion film 14, and transparent glass 15, stacked sequentially. For example, the backsheet 11 can be made of glass or polyvinyl fluoride composite film (TPT), and the second encapsulating film 132 and the light conversion film 14 can be an integral structure or independent structures. The laminated photovoltaic module 1 is conveyed by the conveyor roller 2 to the testing hood 3 for testing. To accommodate photovoltaic modules 1 of different sizes, the testing hood 3 can be a cuboid structure with a length of 3m~4m, a width of 1.2m~2.2m, and a height of 0.8m~1.2m. Figure 2 and Figure 3 As shown, multiple top excitation light source units 4 and multiple top signal acquisition units 5 are provided on the top inner wall of the detection cover 3, and multiple edge excitation light source units 6 and multiple edge signal acquisition units 7 are provided on the inner side wall of the detection cover 3 along the second horizontal direction z. When the photovoltaic module 1 enters the detection cover 3, the processing unit controls the multiple top excitation light source units 4 to project a first wavelength light onto the upper surface of the photovoltaic module 1, and controls the multiple edge excitation light source units 6 to project a first wavelength light onto the edge of the photovoltaic module 1. When the first wavelength light is projected onto the upper surface and edge of the photovoltaic module 1, the light conversion film 14 in the photovoltaic module 1 can absorb the first wavelength light and convert it into a second wavelength light. In an optional embodiment, the first wavelength range is 280-400nm, and the second wavelength range is 500-700nm.

[0037] In another optional embodiment, the inner wall of the detection cover 3 is lined with a matte black light-absorbing material to eliminate stray light interference from the production environment, wherein the reflectivity of the matte black light-absorbing material is less than or equal to 0.3%. Exemplarily, the matte black light-absorbing material can be matte black polytetrafluoroethylene. The irradiance of the plurality of top excitation light source units 4 is 1.0~2.0 mW / cm². 2 And / or, multiple top excitation light source units 4 are tilted to irradiate the photovoltaic module 1, and the angle between the projected first wavelength light and the surface of the photovoltaic module 1 is 25°~35°. The multiple top excitation light source units 4 and multiple edge excitation light source units 6 can be cylindrical ultraviolet LED light sources or strip-shaped ultraviolet light sources. In a specific embodiment, the crystalline silicon photovoltaic module 1 has a width of 1.2m, a length of 2m, and a thickness of 40mm after lamination. At this time, the detection cover 3 has a length of 3.5m, a width of 1.8m, and a height of 1m, with an inner wall made of matte black polytetrafluoroethylene material and a reflectivity of 0.2%. The angle between the top excitation light source unit 4 and the upper surface of the photovoltaic module 1 is 30°, and the irradiance is 1.5mW / cm². 2 The length of the edge excitation light source unit 6 is 2m.

[0038] Furthermore, the solar cell 12 can absorb the second wavelength of light and convert its light energy into electrical energy, thereby improving the power generation efficiency of the photovoltaic module 1. However, since multiple solar cells 12 are spaced apart in the photovoltaic module 1, on the one hand, the solar cells 12 will not completely absorb the second wavelength of light, and on the other hand, the second wavelength of light projected onto the spaced areas of the solar cells 12 will not be utilized. Therefore, some of the second wavelength of light will escape from the upper surface and edges of the photovoltaic module 1 after multiple scatterings.

[0039] Based on this, multiple top signal acquisition units 5 are set on the top inner wall of the detection cover 3, and multiple edge signal acquisition units 7 are set on the inner side wall of the detection cover 3 along the second horizontal direction z. The processing unit controls the multiple top signal acquisition units 5 to detect the intensity of the second wavelength light projected by multiple first detection points on the upper surface of the photovoltaic module 1 and generates a first top light intensity signal. The processing unit also controls the multiple edge signal acquisition units 7 to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module 1 and generates a first side light intensity signal. This allows it to determine whether the light conversion film 14 converts the first wavelength light into the second wavelength light, and further determine the conversion efficiency and uniformity of the light conversion film 14 at different locations.

[0040] Specifically, 16-20 top signal acquisition units 5 can be evenly arranged on the top inner wall of the detection cover 3. Each top signal acquisition unit 5 can be a photodetector, with its lens facing the upper surface of the photovoltaic module 1 and a distance of 5-8 cm between the photodetector and the upper surface of the photovoltaic module 1. A 500-700 nm filter is configured on the lens of the photodetector. At this point, the second wavelength light projected from the upper surface of the photovoltaic module 1 can be detected by the top signal acquisition unit 5. Figure 2 and Figure 3 Each top signal acquisition unit 5 corresponds to a first detection point on the upper surface of the photovoltaic module 1. The top signal acquisition unit 5 detects the intensity of the second wavelength light at the first detection point and generates a corresponding first top light intensity signal. For example, the response time of the top signal acquisition unit 5 is less than or equal to 1 ms, and the sensitivity is greater than or equal to 0.1 μW / cm². 2 .

[0041] Similarly, to detect the intensity of the second wavelength light at the edge of photovoltaic module 1, continue to refer to... Figure 2 and Figure 3Eight to ten edge signal acquisition units 7 can be evenly arranged on the inner wall of the detection cover 3 along the second horizontal direction z. Each edge signal acquisition unit 7 can be a photodetector, with its lens facing the edge of the photovoltaic module 1 and a distance of 3-5 cm between the photodetector and the edge of the photovoltaic module 1. A 500-700 nm filter is configured on the lens of the photodetector. The second wavelength light projected from the edge of the photovoltaic module 1 can then be detected by the edge signal acquisition unit 7. Each edge signal acquisition unit 7 corresponds to a second detection point on the edge of the photovoltaic module 1. The edge signal acquisition unit 7 detects the intensity of the second wavelength light at the second detection point and generates a corresponding first-side scattering intensity signal. For example, the response time of the edge signal acquisition unit 7 is less than or equal to 1 ms, and its sensitivity is greater than or equal to 0.1 μW / cm². 2 In this case, any second detection point and at least one first detection point are located in the same vertical plane, and the vertical plane is perpendicular to the first horizontal direction.

[0042] It should be noted that, Figure 2 and Figure 3 The number of top excitation light source unit 4, top signal acquisition unit 5, edge excitation light source unit 6, and edge signal acquisition unit 7 is merely exemplary. In actual applications, they can be flexibly adjusted according to the size of the photovoltaic module 1. This is not intended to limit the scope of this application. Therefore, it can adapt to different sizes and specifications of mainstream photovoltaic modules and be applied to online detection of various ultraviolet-excited light conversion films, demonstrating strong versatility. In a specific embodiment, 18 top signal acquisition units 5 are evenly arranged on the top inner wall of the detection cover 3, with a distance of 6 cm between the top signal acquisition units 5 and the upper surface of the photovoltaic module 1. Nine edge signal acquisition units 7 are arranged on each side of the inner wall of the detection cover 3 along the second horizontal direction z, with a distance of 4 cm between the edge signal acquisition units 7 and the edge of the photovoltaic module 1. The response time of the top signal acquisition unit 5 and the edge signal acquisition unit 7 is 0.8 ms, and the sensitivity is 0.08 μW / cm. 2 .

[0043] Furthermore, such as Figure 2 As shown, for any first detection point, when the corresponding top signal acquisition unit 5 detects the intensity of the second wavelength light projected from the upper surface of the photovoltaic module 1 at that point, the second wavelength light corresponding to the first detection point will also escape from the edge of the photovoltaic module 1. Therefore, the edge signal acquisition unit 7 can be used simultaneously to detect the intensity of the second wavelength light at the second detection point at the edge of the photovoltaic module 1. Since the second detection point and the first detection point are located in the same vertical plane, the light intensity of the actual second wavelength light corresponding to the first detection point can be determined based on the first top light intensity signal and the first side light intensity signal.

[0044] Therefore, after obtaining the first top light intensity signal and the first side light intensity signal, the processing unit can determine the conversion efficiency and uniformity of the light conversion film at multiple first detection points based on the known dynamic calibration coefficient, the first top light intensity signal, and the first side light intensity signal.

[0045] Specifically, the dynamic calibration coefficient is the relationship between the actual light intensity of the second wavelength light at each first detection point in photovoltaic module 1 and the conversion efficiency at that point. Therefore, after determining the light intensity of the actual second wavelength light corresponding to the first detection point, the conversion efficiency of the light conversion film at multiple first detection points can be determined based on the known dynamic calibration coefficient. Furthermore, after determining the conversion efficiency at multiple first detection points, the uniformity of the light conversion film can be determined based on the difference between the conversion efficiencies at multiple first detection points.

[0046] This invention effectively solves the problem of insufficient excitation in the central region of non-transparent modules caused by obstructed traditional transmission light paths by combining a top excitation light source unit and an edge excitation light source unit, ensuring uniform excitation of the light conversion film throughout the entire module. Simultaneously, by using a dual-path collaborative acquisition method involving the top and edge signal acquisition units, it compensates for potential signal loss in a single path, achieving accurate detection of the entire non-transparent photovoltaic module without blind spots, breaking through the dependence of traditional through-detection methods on transparent photovoltaic modules. Furthermore, during the detection process, the top excitation light source unit, edge excitation light source unit, top signal acquisition unit, and edge signal acquisition unit do not contact the photovoltaic module, completely avoiding glass scratches or lamination structure damage that could be caused by physical contact, thus strongly guaranteeing the quality of the finished photovoltaic module.

[0047] Optionally, such as Figure 1 As shown, the online testing device also includes a lifting drive unit 8, which is connected to the testing cover 3. The lifting drive unit 8 is used to adjust the distance between the testing cover 3 and the conveyor roller 2 in the vertical direction y, and to control the opening and closing of the openable inlet and outlet so that the photovoltaic module 1 can be tested inside the testing cover 3.

[0048] Specifically, when the conveyor roller 2 transports the photovoltaic module 1 to the vicinity of the inspection cover 3, the lifting drive unit 8 can control the inspection cover 3 to descend and open the closable inlet / outlet on the inspection cover 3, allowing the photovoltaic module 1 to enter the inspection cover 3. After the photovoltaic module 1 enters the inspection cover 3, the lifting drive unit 8 can control the closable inlet / outlet on the inspection cover 3 to close, so that the photovoltaic module 1 completes the inspection within the inspection cover 3. At this time, the gap between the inspection cover 3 and the surface of the conveyor roller 2 is less than or equal to 5 cm. After the inspection is completed, the lifting drive unit 8 then controls the closable inlet / outlet on the inspection cover 3 to open again, allowing the photovoltaic module 1 to exit the inspection cover 3.

[0049] Optionally, such as Figure 1 As shown, the online testing device also includes a cleaning module 9, which is located on the side of the testing cover 3 away from the first horizontal direction x. The cleaning module 9 includes a high-pressure nitrogen purging unit and a soft brush unit. The high-pressure nitrogen purging unit is used to remove dust from the surface of the photovoltaic module 1, and the soft brush unit is used to clean residual impurities on the surface of the photovoltaic module 1.

[0050] Specifically, the cleaning module 9 can be positioned 10cm-50cm away from the first horizontal direction x in the detection cover 3. When the photovoltaic module 1 is conveyed to the cleaning module 9 by the conveyor roller 2, the high-pressure nitrogen blowing unit in the cleaning module 9 blows away the dust on the surface of the photovoltaic module 1. The blowing direction is at a 30°-45° angle to the first horizontal direction x, and the nitrogen pressure is 0.3MPa-0.5MPa. Further, a soft brush unit cleans the residual impurities on the surface of the photovoltaic module 1. The distance between the brush in the soft brush unit and the surface of the photovoltaic module 1 is less than or equal to 1mm, and the brush material can be polytetrafluoroethylene (PTFE) soft bristles. In a specific embodiment, the nitrogen pressure of the high-pressure nitrogen blowing unit is 0.4MPa, the blowing direction is at a 40° angle to the first horizontal direction x, and the distance between the soft brush unit and the surface of the photovoltaic module 1 is 0.8mm.

[0051] By incorporating a cleaning module, this invention ensures that the surface of photovoltaic modules is free of contamination before testing, thereby improving the accuracy of the test results.

[0052] Optionally, such as Figure 2 As shown, multiple top signal acquisition units 5 are arranged in n columns along the first horizontal direction x and m rows along the second horizontal direction z on the top inner wall of the detection cover 3; where n and m are both positive integers greater than or equal to 1. Multiple edge signal acquisition units 7 include n first edge signal acquisition units 701 and n second edge signal acquisition units 702. The n first edge signal acquisition units 701 and n second edge signal acquisition units 702 are located on two opposite inner sidewalls of the detection cover 3 along the second horizontal direction z, respectively. The i-th first edge signal acquisition unit 701, the i-th second edge signal acquisition unit 702, and the i-th column of top signal acquisition units 5 are located in the same vertical plane; where i is a positive integer from 1 to n.

[0053] The processing unit is connected to n first edge signal acquisition units 701, and is used to control the intensity of the second wavelength light projected by the n first edge signal acquisition units 701 at multiple second detection points on the edge of the photovoltaic module 1, and to generate a second side luminescence intensity signal. The processing unit is also connected to n second edge signal acquisition units 702, and is used to control the intensity of the second wavelength light projected by the n second edge signal acquisition units 702 at multiple second detection points on the edge of the photovoltaic module 1, and to generate a third side luminescence intensity signal. The processing unit is also used to determine the conversion efficiency and uniformity of the light conversion film 14 at each first detection point based on the known dynamic calibration coefficient, the first top light intensity signal, the second side luminescence intensity signal, and the third side luminescence intensity signal.

[0054] Since the second wavelength light emanating from the edge of the photovoltaic module 1 may emerge from multiple edges of the photovoltaic module 1, multiple edge signal acquisition units 7 can be evenly arranged on two opposing inner sidewalls of the detection cover 3 along the second horizontal direction z to detect the intensity of the second wavelength light emanating from the edges of different photovoltaic modules 1. Specifically, when multiple top signal acquisition units 5 are arranged in n columns along the first horizontal direction x and m rows along the second horizontal direction z on the top inner wall of the detection cover 3, it indicates that the upper surface of the photovoltaic module 1 contains n columns of first detection points, and each column contains m first detection points.

[0055] To determine the actual light intensity of the second wavelength light at multiple first detection points of the light conversion film 14, such as Figure 2 As shown, the multiple edge signal acquisition units 7 include n first edge signal acquisition units 701 and n second edge signal acquisition units 702. The n first edge signal acquisition units 701 and n second edge signal acquisition units 702 are respectively located on two opposite inner sidewalls of the detection cover 3 along the second horizontal direction z. The i-th first edge signal acquisition unit 701, the i-th second edge signal acquisition unit 702, and the i-th column top signal acquisition unit 5 are located in the same vertical plane. That is, for the i-th column first detection point on the upper surface of the photovoltaic module 1, there is a second detection point corresponding to each of the two opposite edges of the photovoltaic module 1 along the second horizontal direction z.

[0056] Furthermore, the processing unit controls the n first edge signal acquisition units 701 to detect the intensity of the second wavelength light projected from multiple second detection points on the edge of the photovoltaic module 1, and generates a second side luminescence intensity signal. It also controls the n second edge signal acquisition units 702 to detect the intensity of the second wavelength light projected from multiple second detection points on the edge of the photovoltaic module 1, and generates a third side luminescence intensity signal. At this point, for any first detection point on the surface of the photovoltaic module 1, the actual intensity of the second wavelength light is determined by the first top light intensity signal, the second side luminescence intensity signal, and the third side luminescence intensity signal. In other words, the processing unit can determine the conversion efficiency and uniformity of the light conversion film 14 at each first detection point based on the known dynamic calibration coefficient, the first top light intensity signal, the second side luminescence intensity signal, and the third side luminescence intensity signal.

[0057] It should be noted that, since the m first detection points in the i-th column are the same as their corresponding second detection points, the detection order of the n first edge signal acquisition units 701, the n second edge signal acquisition units 702 and the multiple top signal acquisition units 5 can be controlled by the processing unit to improve the detection accuracy.

[0058] Optionally, the processing unit is further configured to control multiple top signal acquisition units 5, n first edge signal acquisition units 701, and n second edge signal acquisition units 702 to detect the ambient background light intensity within the detection cover 3 and generate an ambient background light signal when none of the multiple top excitation light source units 4 and multiple edge excitation light source units 6 project the first wavelength light. The processing unit is also configured to determine the conversion efficiency of the light conversion film 14 at multiple first detection points and the uniformity of the light conversion film 14 based on the known dynamic calibration coefficient, the first top light intensity signal, the second side emitting light intensity signal, the third side emitting light intensity signal, and the ambient background light signal.

[0059] Specifically, when using the top signal acquisition unit 5 to detect the intensity of the second wavelength light projected at the first detection point, and using n first edge signal acquisition units 701 and n second edge signal acquisition units 702 to detect the intensity of the second wavelength light projected at the second detection point, the intensity information of the ambient background light will inevitably be detected. Therefore, when the processing unit controls the multiple top excitation light source units 4 and the multiple edge excitation light source units 6 to not project the first wavelength light, the detection cover 3 contains only the ambient background light. The processing unit can control the multiple top signal acquisition units 5, the n first edge signal acquisition units 701 and the n second edge signal acquisition units 702 to detect the intensity of the ambient background light in the detection cover 3, thereby removing the ambient background light intensity when determining the actual intensity of the second wavelength light at each of the multiple first detection points. Furthermore, based on the known dynamic calibration coefficient, the first top light intensity signal, the second side emitting light intensity signal, the third side emitting light intensity signal and the ambient background light signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined.

[0060] The embodiments of the present invention use a first edge signal acquisition unit and a second edge signal acquisition unit to detect the emitted light intensity of two mutually opposite edges of the photovoltaic module along the second horizontal direction, and use a top signal acquisition unit, the first edge signal acquisition unit and the second edge signal acquisition unit to detect the ambient background light intensity inside the detection cover, thereby further improving the accuracy of the detection results.

[0061] Optionally, the processing unit is also used to determine that the photovoltaic module is qualified when the conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and the uniformity is less than or equal to a preset uniformity threshold; and to determine that the photovoltaic module is unqualified when the conversion efficiency is less than the preset conversion efficiency qualification threshold or the uniformity is greater than the preset uniformity threshold.

[0062] After determining the conversion efficiency of the light conversion film 14 at each first detection point and the uniformity of the light conversion film, the processing unit can further determine whether the photovoltaic module 1 is qualified, thereby preventing unqualified photovoltaic modules 1 from entering the next processing step. Specifically, when the conversion efficiency is greater than or equal to the preset conversion efficiency qualification threshold and the uniformity is less than or equal to the preset uniformity threshold, it is determined that the photovoltaic module is qualified. At this time, it indicates that each point of the light conversion film 14 of the photovoltaic module 1 can perform good light conversion, and the difference in the light conversion efficiency of each point is small, with good uniformity. Therefore, it can be sent to the next process for processing through the conveying roller path 2. When the conversion efficiency is less than the preset conversion efficiency qualification threshold, or the uniformity is greater than the preset uniformity threshold, it is determined that the photovoltaic module is unqualified, indicating that some areas of the light conversion film 14 of the photovoltaic module 1 at this time cannot perform effective light conversion, or the difference in the light conversion efficiency between each point of the light conversion film 14 is large. At this time, it is determined that the photovoltaic module is unqualified, and it can be sent to the rework or cutting station through the diversion device. Exemplarily, the preset conversion efficiency qualification threshold can be 80%, and the preset uniformity threshold can be 4%.

[0063] Optionally, the on-line detection device further includes an alarm unit and a data storage unit, and the processing unit is respectively connected to the alarm unit and the data storage unit. The processing unit is used to generate an alarm signal when determining that the photovoltaic module is unqualified; the alarm unit is used to trigger an alarm when receiving the alarm signal. The processing unit is used to generate a storage signal when determining that the photovoltaic module is qualified; the data storage unit is used to obtain the conversion efficiency and uniformity corresponding to the current photovoltaic module when receiving the storage signal and store them.

[0064] Specifically, when the processing unit determines that the photovoltaic module is unqualified, the alarm unit can perform an alarm action to remind relevant operators. When the processing unit determines that the photovoltaic module is qualified, the data storage unit can store the conversion efficiency and uniformity corresponding to the photovoltaic module for subsequent query.

[0065] Based on the same inventive concept, Figure 4 is a schematic flowchart of an on-line detection method for the light conversion film of a photovoltaic module provided by an embodiment of the present invention. As Figure 4 shown, the on-line detection method includes a detection process, and the detection process includes: S101. Control a plurality of top excitation light source units to project first wavelength light onto the upper surface of the photovoltaic module.

[0066] As Figures 1-3As shown, after the photovoltaic module 1 enters the detection cover 3, multiple top excitation light source units 4 are controlled to project a first wavelength of light onto the upper surface of the photovoltaic module 1, so that the light conversion film 14 can absorb the first wavelength of light and convert it into a second wavelength of light. The first wavelength range is 280-400nm, and the second wavelength range is 500-700nm.

[0067] S102, control multiple edge excitation light source units to project the first wavelength light onto the edge of the photovoltaic module.

[0068] Specifically, after the photovoltaic module 1 enters the detection cover 3, multiple edge excitation light source units 6 are controlled to project a first wavelength of light onto the edge of the photovoltaic module 1, causing the light conversion film 14 to absorb the first wavelength of light from the edge of the photovoltaic module 1. The light conversion film 14 also converts the first wavelength of light into a second wavelength of light. At this time, multiple top excitation light source units 4 and multiple edge excitation light source units 6 jointly illuminate the photovoltaic module 1, effectively solving the problem of insufficient excitation in the central area of ​​non-transparent modules caused by the obstruction of the traditional transmission light path, and ensuring that the light conversion film is uniformly excited throughout the entire module.

[0069] S103. Control the intensity of the second wavelength light projected by multiple top signal acquisition units to the multiple first detection points on the upper surface of the photovoltaic module, and generate a first top light intensity signal.

[0070] In photovoltaic module 1, the solar cells 12 can further absorb the second wavelength of light and convert its light energy into electrical energy, thereby improving the power generation efficiency of photovoltaic module 1. However, since multiple solar cells 12 are spaced apart in photovoltaic module 1, on the one hand, the solar cells 12 will not completely absorb the second wavelength of light, and on the other hand, the second wavelength of light projected onto the spaced areas of the solar cells 12 will not be utilized. Therefore, some of the second wavelength of light will escape from the upper surface and edges of photovoltaic module 1 after multiple scatterings.

[0071] Based on this, multiple top signal acquisition units 5 are controlled to detect the intensity of the second wavelength light projected from multiple first detection points on the upper surface of the photovoltaic module 1, and generate a first top light intensity signal. Each top signal acquisition unit 5 corresponds to a first detection point on the upper surface of the photovoltaic module 1. When the top signal acquisition unit 5 detects the intensity of the second wavelength light, it indicates that the light conversion film 14 can convert the first wavelength light into the second wavelength light.

[0072] S104. Control the intensity of the second wavelength light projected by multiple edge signal acquisition units at multiple second detection points on the edge of the photovoltaic module, and generate the first side light intensity signal.

[0073] In this configuration, any second detection point and at least one first detection point are located in the same vertical plane, and the vertical plane is perpendicular to the first horizontal direction.

[0074] Since for any given first detection point, when the corresponding top signal acquisition unit 5 detects the intensity of the second wavelength light projected from the upper surface of the photovoltaic module 1 at that point, the second wavelength light corresponding to the first detection point will also escape from the edge of the photovoltaic module 1, the edge signal acquisition unit 7 can simultaneously detect the intensity of the second wavelength light at the second detection point at the edge of the photovoltaic module 1 and generate a first side escaping light intensity signal. Each edge signal acquisition unit 7 corresponds to a second detection point at the edge of the photovoltaic module 1. Since the second detection point and the first detection point are located in the same vertical plane, the actual light intensity of the second wavelength light corresponding to the first detection point can be determined based on the first top light intensity signal and the first side escaping light intensity signal.

[0075] S105. Based on the known dynamic calibration coefficient, the first top light intensity signal, and the first side light intensity signal, determine the conversion efficiency of the light conversion film and the uniformity of the light conversion film at each first detection point.

[0076] Specifically, the dynamic calibration coefficient is the relationship between the actual light intensity of the second wavelength light at each first detection point in photovoltaic module 1 and the conversion efficiency at that point. Therefore, after determining the light intensity of the actual second wavelength light corresponding to the first detection point, the conversion efficiency of the light conversion film at multiple first detection points can be determined based on the known dynamic calibration coefficient. Furthermore, after determining the conversion efficiency at multiple first detection points, the uniformity of the light conversion film can be determined based on the difference between the conversion efficiencies at multiple first detection points.

[0077] This invention effectively solves the problem of insufficient excitation in the central region of non-transparent modules caused by obstructed traditional transmission light paths by combining a top excitation light source unit and an edge excitation light source unit, ensuring uniform excitation of the light conversion film throughout the entire module. Simultaneously, by using dual-path collaborative acquisition of the top and edge signal acquisition units, it compensates for potential signal loss in a single path, achieving accurate detection of the entire non-transparent photovoltaic module without blind spots. Furthermore, during the detection process, the top excitation light source unit, edge excitation light source unit, top signal acquisition unit, and edge signal acquisition unit do not come into contact with the photovoltaic module, completely avoiding glass scratches or lamination structure damage that could be caused by physical contact, thus strongly guaranteeing the quality of the finished photovoltaic module.

[0078] Optionally, such as Figure 2As shown, multiple top signal acquisition units 5 are arranged in n columns along the first horizontal direction x and m rows along the second horizontal direction z on the top inner wall of the detection cover 3; where n and m are both positive integers greater than or equal to 1. Multiple edge signal acquisition units 7 include n first edge signal acquisition units 701 and n second edge signal acquisition units 702. The n first edge signal acquisition units 701 and n second edge signal acquisition units 702 are located on two opposite inner sidewalls of the detection cover 3 along the second horizontal direction z, respectively. The i-th first edge signal acquisition unit 701, the i-th second edge signal acquisition unit 702, and the i-th column of top signal acquisition units 5 are located in the same vertical plane; where i is a positive integer from 1 to n.

[0079] Figure 5 This is a flowchart illustrating another online detection method for the light conversion film of a photovoltaic module provided by an embodiment of the present invention. This embodiment is a refinement of the above embodiment. Specifically, step S104, controlling the intensity of the second wavelength light projected by multiple edge signal acquisition units corresponding to multiple second detection points on the edge of the photovoltaic module and generating a first-side luminescence intensity signal, can be further refined as follows: Control the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module by n first edge signal acquisition units, and generate a second side light intensity signal; Control the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module by n second edge signal acquisition units, and generate a third side light intensity signal; Furthermore, for step S105, determining the conversion efficiency and uniformity of the light conversion film at each first detection point based on the known dynamic calibration coefficients, the first top light intensity signal, and the first side eclipse intensity signal can be further refined as follows: Based on the known dynamic calibration coefficients, the first top light intensity signal, the second side light intensity signal, and the third side light intensity signal, the conversion efficiency and uniformity of the light conversion film at each first detection point are determined.

[0080] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 5 As shown, the detection process of the online detection method provided in this embodiment includes: S201, Control multiple top excitation light source units to project the first wavelength of light onto the upper surface of the photovoltaic module.

[0081] S202, control multiple edge excitation light source units to project the first wavelength light onto the edge of the photovoltaic module.

[0082] S203. Control the intensity of the second wavelength light projected by multiple top signal acquisition units to the multiple first detection points on the upper surface of the photovoltaic module, and generate a first top light intensity signal.

[0083] S204. Control the intensity of the second wavelength light projected by the n first edge signal acquisition units corresponding to the multiple second detection points on the edge of the photovoltaic module, and generate the second side light intensity signal.

[0084] S205. Control the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module by the n second edge signal acquisition units, and generate the third side light intensity signal.

[0085] S206. Based on the known dynamic calibration coefficient, the first top light intensity signal, the second side light intensity signal, and the third side light intensity signal, determine the conversion efficiency of the light conversion film and the uniformity of the light conversion film at each first detection point.

[0086] For steps S204 to S206, since the second wavelength light emanating from the edge of the photovoltaic module 1 may emerge from multiple edges of the photovoltaic module 1, multiple edge signal acquisition units 7 can be uniformly arranged on two opposing inner sidewalls of the detection cover 3 along the second horizontal direction z to detect the intensity of the second wavelength light emanating from different edges of the photovoltaic module 1. Figure 2 As shown, n first edge signal acquisition units 701 and n second edge signal acquisition units 702 are respectively located on two opposite inner sidewalls of the detection cover 3 along the second horizontal direction z. The i-th first edge signal acquisition unit 701, the i-th second edge signal acquisition unit 702, and the i-th column top signal acquisition unit 5 are located in the same vertical plane. That is, for the i-th column first detection point on the upper surface of the photovoltaic module 1, there is a second detection point corresponding to each of the two opposite edges of the photovoltaic module 1 along the second horizontal direction z.

[0087] Furthermore, the n first edge signal acquisition units 701 are controlled to detect the intensity of the second wavelength light projected from multiple second detection points on the edge of the photovoltaic module 1, and generate a second side luminescence intensity signal. Similarly, the n second edge signal acquisition units 702 are controlled to detect the intensity of the second wavelength light projected from multiple second detection points on the edge of the photovoltaic module 1, and generate a third side luminescence intensity signal. At this point, for any first detection point on the surface of the photovoltaic module 1, the actual intensity of the second wavelength light is determined by the first top light intensity signal, the second side luminescence intensity signal, and the third side luminescence intensity signal. In other words, the conversion efficiency and uniformity of the light conversion film 14 at each first detection point can be determined based on the known dynamic calibration coefficient, the first top light intensity signal, the second side luminescence intensity signal, and the third side luminescence intensity signal.

[0088] Optionally, Figure 6 This is a flowchart illustrating another online detection method for the light conversion film of a photovoltaic module provided by an embodiment of the present invention. This embodiment is a refinement of the above embodiment. Specifically, before step S206, which determines the conversion efficiency and uniformity of the light conversion film at each first detection point based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflorescence intensity signal, and the third side efflorescence intensity signal, the method further includes: The ambient light signals output by multiple top signal acquisition units, n first edge signal acquisition units, and n second edge signal acquisition units are acquired.

[0089] Further, step S206, determining the conversion efficiency and uniformity of the light conversion film at each first detection point based on the known dynamic calibration coefficients, the first top light intensity signal, the second side emitting light intensity signal, and the third side emitting light intensity signal, can be refined as follows: Based on the known dynamic calibration coefficients, the first top light intensity signal, the second side emitting light intensity signal, the third side emitting light intensity signal, and the ambient background light signal, the conversion efficiency and uniformity of the light conversion film at each first detection point are determined.

[0090] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 6 As shown, the detection process of the online detection method provided in this embodiment includes: S301, Control multiple top excitation light source units to project the first wavelength of light onto the upper surface of the photovoltaic module.

[0091] S302, control multiple edge excitation light source units to project the first wavelength light onto the edge of the photovoltaic module.

[0092] S303. Control the intensity of the second wavelength light projected by multiple top signal acquisition units to the multiple first detection points on the upper surface of the photovoltaic module, and generate a first top light intensity signal.

[0093] S304. Control the intensity of the second wavelength light projected by the n first edge signal acquisition units corresponding to the multiple second detection points on the edge of the photovoltaic module, and generate the second side light intensity signal.

[0094] S305: Control the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module by the n second edge signal acquisition units, and generate the third side light intensity signal.

[0095] S306. Acquire ambient light signals output by multiple top signal acquisition units, n first edge signal acquisition units, and n second edge signal acquisition units.

[0096] S307. Based on the known dynamic calibration coefficient, the first top light intensity signal, the second side emitting light intensity signal, the third side emitting light intensity signal, and the ambient background light signal, determine the conversion efficiency of the light conversion film at each first detection point and the uniformity of the light conversion film.

[0097] For steps S306 and S307, since the intensity of the second wavelength light projected at the first detection point is detected using the top signal acquisition unit 5, and the intensity of the second wavelength light projected at the second detection point is detected using n first edge signal acquisition units 701 and n second edge signal acquisition units 702, the intensity information of the ambient background light will inevitably be detected. Therefore, when none of the multiple top excitation light source units 4 and the multiple edge excitation light source units 6 project the first wavelength light, the detection cover 3 contains only the ambient background light. The intensity of the ambient background light in the detection cover 3 can be detected by the multiple top signal acquisition units 5, n first edge signal acquisition units 701 and n second edge signal acquisition units 702, thereby removing the ambient background light intensity when determining the actual intensity of the second wavelength light at each of the multiple first detection points. Further, based on the known dynamic calibration coefficient, the first top light intensity signal, the second side emitting light intensity signal, the third side emitting light intensity signal and the ambient background light signal, the conversion efficiency and uniformity of the light conversion film at each first detection point are determined.

[0098] The embodiments of the present invention use a first edge signal acquisition unit and a second edge signal acquisition unit to detect the emitted light intensity of two mutually opposite edges of the photovoltaic module along the second horizontal direction, and use a top signal acquisition unit, the first edge signal acquisition unit and the second edge signal acquisition unit to detect the ambient background light intensity inside the detection cover, thereby further improving the accuracy of the detection results.

[0099] Optionally, Figure 7 This is a flowchart illustrating another online detection method for the light conversion film of a photovoltaic module provided by an embodiment of the present invention. This embodiment is a refinement of the above embodiment. For step S307, determining the conversion efficiency and uniformity of the light conversion film at each first detection point based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, the third side efflux intensity signal, and the ambient background light signal, can be further refined as follows: The first top light intensity signal, the second side light intensity signal, and the third side light intensity signal are all denoised to obtain the second top light intensity signal, the fourth side light intensity signal, and the fifth side light intensity signal, respectively. The second top light intensity signal, the fourth side light intensity signal, and the fifth side light intensity signal are all corrected to obtain the third top light intensity signal, the sixth side light intensity signal, and the seventh side light intensity signal, respectively. Based on the known dynamic calibration coefficients, the third top light intensity signal, the sixth side emitting light intensity signal, the seventh side emitting light intensity signal, and the ambient background light signal, the conversion efficiency and uniformity of the light conversion film at each first detection point are determined.

[0100] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 7 As shown, the detection process of the online detection method provided in this embodiment includes: S401, control multiple top excitation light source units to project the first wavelength of light onto the upper surface of the photovoltaic module.

[0101] S402, control multiple edge excitation light source units to project the first wavelength light onto the edge of the photovoltaic module.

[0102] S403. Control the intensity of the second wavelength light projected by multiple top signal acquisition units to the multiple first detection points on the upper surface of the photovoltaic module, and generate a first top light intensity signal.

[0103] S404. Control the intensity of the second wavelength light projected by the n first edge signal acquisition units corresponding to the multiple second detection points on the edge of the photovoltaic module, and generate the second side light intensity signal.

[0104] S405: Control the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module by n second edge signal acquisition units, and generate a third side light intensity signal.

[0105] S406. Acquire ambient light signals output by multiple top signal acquisition units, n first edge signal acquisition units, and n second edge signal acquisition units.

[0106] S407. The first top light intensity signal, the second side light intensity signal, and the third side light intensity signal are all subjected to noise reduction processing to obtain the second top light intensity signal, the fourth side light intensity signal, and the fifth side light intensity signal, respectively.

[0107] When the second wavelength light projected onto multiple first detection points on the upper surface of the photovoltaic module 1 is detected by multiple top signal acquisition units 5, and the second wavelength light projected onto multiple second detection points on the edge of the photovoltaic module 1 is detected by n first edge signal acquisition units 701 and n second edge signal acquisition units 702, stray light and electromagnetic interference in the production environment will introduce signal noise into the first top light intensity signal, the second side scattering light intensity signal and the third side scattering light intensity signal. Therefore, the first top light intensity signal, the second side scattering light intensity signal and the third side scattering light intensity signal can all be noise-reduced to obtain the second top light intensity signal, the fourth side scattering light intensity signal and the fifth side scattering light intensity signal, respectively.

[0108] In an optional embodiment, noise reduction processing is performed on the first top light intensity signal, the second side emitting light intensity signal, and the third side emitting light intensity signal to obtain the second top light intensity signal, the fourth side emitting light intensity signal, and the fifth side emitting light intensity signal, respectively, including: Variational mode decomposition is performed on the first top light intensity signal, the second side light intensity signal, and the third side light intensity signal to generate multiple corresponding intrinsic mode functions. Calculate the envelope entropy and sample entropy of each intrinsic mode function, and calculate the composite entropy corresponding to each intrinsic mode function by weighted summation; Remove the intrinsic mode function corresponding to the maximum value of the composite entropy, and reconstruct the remaining intrinsic mode functions to obtain the second top light intensity signal, the fourth side luminous intensity signal, and the fifth side luminous intensity signal, respectively.

[0109] Specifically, multiple top signal acquisition units 5 detect the second wavelength light projected onto multiple first detection points on the upper surface of the photovoltaic module to obtain a first top light intensity signal Isc1. Similarly, n first edge signal acquisition units 701 and n second edge signal acquisition units 702 detect the second wavelength light projected onto multiple second detection points on the edge of the photovoltaic module to obtain a second side luminous intensity signal Ied1 and a third side luminous intensity signal Ied2. Then, variational mode decomposition can be performed on the first top light intensity signal Isc1, the second side luminous intensity signal Ied1, and the third side luminous intensity signal Ied2 corresponding to each detection point to generate their respective multiple intrinsic mode functions. For example, the initial decomposition layer number can be set to 3-5 layers, and the penalty factor α can be 2000.

[0110] The envelope entropy and sample entropy of each intrinsic mode function are further calculated, and the composite entropy corresponding to each intrinsic mode function is calculated by weighted summation. The weight coefficients can be set according to the noise intensity of the production environment. When the stray interference light in the production environment is strong, the weight corresponding to the envelope entropy is set to 0.6, and the weight corresponding to the sample entropy is 0.4. When the electromagnetic interference in the production environment is strong, the weight corresponding to the sample entropy is set to 0.6, and the weight corresponding to the envelope entropy is set to 0.4.

[0111] After calculating the composite entropy corresponding to each intrinsic mode function at each detection point, since the maximum composite entropy value represents the noise-dominated mode, the intrinsic mode function corresponding to the maximum composite entropy value at each detection point is removed. Further reconstruction of the remaining intrinsic mode functions at each detection point removes broadband noise and abnormal spike noise, resulting in the acquisition of the second top light intensity signal Isc1' at each first detection point, and the acquisition of the fourth side effusive light intensity signal Ied1' and the fifth side effusive light intensity signal Ied2' at each second detection point.

[0112] S408. Correction processing is performed on the second top light intensity signal, the fourth side emitting light intensity signal and the fifth side emitting light intensity signal to obtain the third top light intensity signal, the sixth side emitting light intensity signal and the seventh side emitting light intensity signal, respectively.

[0113] Specifically, refer to Figure 2 and Figure 3 In the photovoltaic module 1, multiple solar cells 12 are arranged at intervals. Therefore, when the second wavelength light generated by the light conversion film 14 is incident on the area where the solar cell 12 is located, the solar cell 12 will absorb and utilize the second wavelength light. As a result, the intensity of the second wavelength light projected by the upper surface and edge of the photovoltaic module at the first and second detection points located within the solar cell area is low, while the intensity of the second wavelength light projected by the upper surface and edge of the photovoltaic module at the first and second detection points located outside the solar cell area is high.

[0114] Furthermore, even within the cell region, the absorption degree of the second wavelength light differs between the central and edge regions of each cell. Typically, the central region of each cell has a larger absorption amount compared to the edge region. Therefore, after obtaining the second top light intensity signal Isc1' at each first detection point, and the fourth side emanating light intensity signal Ied1' and the fifth side emanating light intensity signal Ied2' at each second detection point, the second top light intensity signal Isc1', the fourth side emanating light intensity signal Ied1', and the fifth side emanating light intensity signal Ied2' can be corrected to make the final detection result more accurate.

[0115] In an optional embodiment, the second top light intensity signal, the fourth side emitting light intensity signal, and the fifth side emitting light intensity signal are all corrected to obtain the third top light intensity signal, the sixth side emitting light intensity signal, and the seventh side emitting light intensity signal, respectively, including: The cell regions in the photovoltaic module are determined based on the preset cell characteristic threshold, the second top light intensity signal, the fourth side luminous intensity signal, and the fifth side luminous intensity signal. The second top light intensity signal located in the cell area of ​​the first detection point is weighted and smoothed to obtain the third top light intensity signal; The light intensity signals on the fourth and fifth sides of the second detection point located within the cell area are weighted and smoothed to obtain the light intensity signals on the sixth and seventh sides.

[0116] Specifically, the preset cell feature threshold can be the grayscale value or signal intensity gradient within or outside the cell area of ​​the photovoltaic module. For example, the signal intensity gradient is greater than or equal to 20%. After obtaining the second top light intensity signal Isc1', the fourth side radiant light intensity signal Ied1', or the fifth side radiant light intensity signal Ied2' corresponding to each detection point, the location of each detection point can be determined according to the light intensity corresponding to each detection point. The intensity of the second wavelength light outside the cell area is the greatest, followed by the edge area of ​​each cell, and finally the center area of ​​each cell.

[0117] Based on this, in order to compensate for the differences in projected light at each detection point within the cell area, the second top light intensity signal Isc1' of the first detection point located within the cell area is subjected to weighted smoothing processing. That is, the second top light intensity signal Isc1' corresponding to the first detection point located in the center region of the cell is given a higher weight, which can be 0.8, and the second top light intensity signal Isc1' corresponding to the first detection point located in the edge region of the cell is given a lower weight, which can be 0.5, thereby obtaining the third top light intensity signal Isc1'' at each first detection point.

[0118] Similarly, the fourth-side luminescence intensity signal Ied1' and the fifth-side luminescence intensity signal Ied2' of the second detection point located within the cell area are subjected to weighted smoothing processing. That is, the fourth-side luminescence intensity signal Ied1' and the fifth-side luminescence intensity signal Ied2' corresponding to the second detection point located in the center area of ​​the cell are given a higher weight, which can be 0.8, and the fourth-side luminescence intensity signal Ied1' and the fifth-side luminescence intensity signal Ied2' corresponding to the second detection point located in the edge area of ​​the cell are given a lower weight, which can be 0.5, thereby obtaining the sixth-side luminescence intensity signal Ied1'' and the seventh-side luminescence intensity signal Ied2'' at each second detection point.

[0119] It is understandable that since the area outside the cell region does not absorb the second wavelength light, the region should have a consistent intensity of the second wavelength light. To avoid excessive smoothing that would lead to the loss of effective signals, the second top light intensity signal Isc1' corresponding to the first detection point outside the cell region, as well as the fourth side emanation light intensity signal Ied1' and the fifth side emanation light intensity signal Ied2' corresponding to the second detection point, are not corrected, thus maintaining the result after noise reduction processing.

[0120] S409. Based on the known dynamic calibration coefficient, the third top light intensity signal, the sixth side emitting light intensity signal, the seventh side emitting light intensity signal, and the ambient background light signal, determine the conversion efficiency of the light conversion film at each first detection point and the uniformity of the light conversion film.

[0121] After noise reduction and correction processing of the signals at each first detection point and each second detection point, the conversion efficiency and uniformity of the light conversion film at each first detection point can be determined based on the known dynamic calibration coefficient, the third top light intensity signal, the sixth side emitting light intensity signal, the seventh side emitting light intensity signal, and the ambient background light signal.

[0122] In an optional embodiment, the conversion efficiency and uniformity of the light conversion film at each first detection point are determined based on known dynamic calibration coefficients, the third top light intensity signal, the sixth side emitting light intensity signal, the seventh side emitting light intensity signal, and the ambient background light signal, including: The ambient background light signal intensity is obtained by calculating the average value of the ambient background light signals output by multiple top signal acquisition units, n first edge signal acquisition units, and n second edge signal acquisition units. The reflected light intensity at the first detection point on the surface of the photovoltaic module is determined based on the third top light intensity signal. The average value of the sixth-side luminescence intensity signal and the seventh-side luminescence intensity signal corresponding to the second detection point located on the same vertical plane as the first detection point on the surface of the photovoltaic module is calculated to obtain the side luminescence signal intensity. The conversion efficiency of the light conversion film at each first detection point on the surface of the photovoltaic module is calculated according to the formula q=k×(Isc+Ied-Ib); where q is the conversion efficiency, k is a known dynamic calibration coefficient, Isc is the reflected light intensity at any detection point on the surface of the photovoltaic module, Ied is the side efflux signal intensity corresponding to the column where any detection point on the surface of the photovoltaic module is located, and Ib is the ambient background light signal intensity. The first difference in conversion efficiency between two adjacent first detection points within the cell area is calculated, and the second difference in conversion efficiency between two adjacent first detection points outside the cell area is calculated. The maximum value of the first difference and the second difference is taken as the uniformity of the light conversion film.

[0123] Specifically, when none of the multiple top excitation light source units 4 and multiple edge excitation light source units 6 project the first wavelength light, when the ambient background light intensity inside the detection cover 3 is detected by multiple top signal acquisition units 5, n first edge signal acquisition units 701 and n second edge signal acquisition units 702, each acquisition unit will output an ambient background light signal. Therefore, the average value of the ambient background light signals output by the multiple top signal acquisition units 5, n first edge signal acquisition units 701 and n second edge signal acquisition units 702 can be further calculated to obtain the ambient background light signal intensity Ib, and it can be applied to the calculation of the conversion efficiency of each first detection point.

[0124] Furthermore, the reflected light intensity Isc of the first detection point corresponding to the surface of the photovoltaic module can be determined based on the third top light intensity signal Isc1''. The reflected light intensity Isc is the intensity of the second wavelength light emitted from the surface of the photovoltaic module, which is detected by multiple top signal acquisition units 5.

[0125] Furthermore, since each first detection point on the surface of the photovoltaic module corresponds to two second detection points that are mutually opposite to each other along the second horizontal direction at the edge of the photovoltaic module, the intensity of the second wavelength light at the second detection point can be understood as the light intensity of the second wavelength light emitted from the edge of the photovoltaic module at the first detection point. Therefore, the average value of the sixth side emanation intensity signal Ied1'' and the seventh side emanation intensity signal Ied2'' corresponding to the second detection point located in the same vertical plane as the first detection point on the surface of the photovoltaic module is calculated to obtain the side emanation signal intensity Ied.

[0126] It is understandable that when the first detection point and the second detection point are located outside the cell area, the reflected light intensity Isc of the first detection point on the surface of the photovoltaic module is determined based on the second top light intensity signal Ied1', and the side radiant light signal intensity Ied is obtained by calculating the average value of the fourth side radiant light intensity signal Ied1' and the fifth side radiant light intensity signal Ied2' corresponding to the second detection point located on the same vertical plane as the first detection point on the surface of the photovoltaic module.

[0127] Furthermore, after obtaining the ambient background light signal intensity Ib, the reflected light intensity Isc, and the lateral light signal intensity Ied, the conversion efficiency of the light conversion film at each first detection point on the surface of the photovoltaic module can be calculated according to the formula q=k×(Isc+Ied-Ib), where q is the conversion efficiency, k is a known dynamic calibration coefficient, and the dynamic calibration coefficient is the relationship between the actual light intensity of the second wavelength light at each first detection point in the photovoltaic module 1 and the conversion efficiency at that point. Thus, the conversion efficiency of the light conversion film at each first detection point on the surface of the photovoltaic module is obtained, and a heat map of the conversion efficiency distribution of the photovoltaic module is generated.

[0128] Furthermore, the uniformity of the light conversion film can be determined based on the difference in conversion efficiency at each first detection point. Specifically, since the absorption degree of the second wavelength light effect differs between the area within and outside the solar cell area, the intensity of the emitted light also varies significantly. In this case, the first difference in conversion efficiency between two adjacent first detection points within the solar cell area and the second difference in conversion efficiency between two adjacent first detection points outside the solar cell area can be calculated, and the maximum value of the first and second differences can be used as the uniformity of the light conversion film.

[0129] In one specific embodiment, the known dynamic calibration coefficient k is 0.00472, and the ambient background light signal intensity Ib is 50 μW / cm². 2The reflected light intensity Isc is 11975 μW / cm. 2 The side-emission signal intensity Ied is 5985 μW / cm. 2 If the conversion efficiency q is 85.8%, and the maximum difference in conversion efficiency between two adjacent points is 3.2%, then the average conversion efficiency of the photovoltaic module is determined to be 86%, and the uniformity is 3.2%.

[0130] This invention embodiment performs noise reduction and correction processing on the first top light intensity signal, the second side light intensity signal, and the third side light intensity signal, simultaneously removing broadband noise and abnormal spike interference, improving the signal-to-noise ratio to over 35:1, effectively suppressing the influence of complex light noise and electromagnetic interference in the production environment on the detection signal, and eliminating signal fluctuations caused by the non-transparent structure of the battery cell, reducing the detection error to within ±1.5%, and the uniformity determination accuracy is significantly better than the industry standard.

[0131] Optionally, the online detection device also includes an alarm unit and a data storage unit, with the processing unit connected to the alarm unit and the data storage unit respectively. Figure 8 This is a schematic flowchart of another online detection method for the light conversion film of a photovoltaic module provided by an embodiment of the present invention. This embodiment is a refinement of the above embodiment. After step S105, which determines the conversion efficiency and uniformity of the light conversion film at each first detection point based on the known dynamic calibration coefficient, the first top light intensity signal, and the first side effusive light intensity signal, the method further includes: A photovoltaic module is deemed qualified when its conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and its uniformity is less than or equal to a preset uniformity threshold. The photovoltaic module is deemed unqualified if the conversion efficiency is less than the preset conversion efficiency qualification threshold or the uniformity is greater than the preset uniformity threshold. Furthermore, after determining that the photovoltaic module is qualified when the conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and the uniformity is less than or equal to a preset uniformity threshold, the following steps are also included: Obtain the current photovoltaic module's specifications; store the current photovoltaic module's conversion efficiency and uniformity, along with its corresponding specifications, into the data storage unit; After determining that the photovoltaic module is unqualified when the conversion efficiency is less than the preset acceptable threshold or the uniformity is greater than the preset uniformity threshold, the following steps are also included: The control alarm unit triggers an alarm.

[0132] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 8 As shown, the detection process of the online detection method provided in this embodiment includes: S501, control multiple top excitation light source units to project the first wavelength of light onto the upper surface of the photovoltaic module.

[0133] S502, control multiple edge excitation light source units to project the first wavelength light onto the edge of the photovoltaic module.

[0134] S503. Control the intensity of the second wavelength light projected by multiple top signal acquisition units to the multiple first detection points on the upper surface of the photovoltaic module, and generate a first top light intensity signal.

[0135] S504. Control multiple edge signal acquisition units to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module, and generate a first side luminous intensity signal.

[0136] S505. Based on the known dynamic calibration coefficient, the first top light intensity signal, and the first side light intensity signal, determine the conversion efficiency of the light conversion film and the uniformity of the light conversion film at each first detection point.

[0137] S506. When the conversion efficiency is greater than or equal to the preset conversion efficiency qualification threshold and the uniformity is less than or equal to the preset uniformity threshold, the photovoltaic module is deemed qualified.

[0138] When the conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and the uniformity is less than or equal to a preset uniformity threshold, the photovoltaic module is deemed qualified. This indicates that all points on the light conversion film 14 of the photovoltaic module 1 can perform good light conversion and that each point has good uniformity. It can then be conveyed to the next processing step via the conveyor roller 2. For example, the preset conversion efficiency qualification threshold can be 80%, and the uniformity threshold can be 4%. If the average conversion efficiency of the photovoltaic module is 86% and the uniformity is 3.2% after testing, the photovoltaic module is deemed qualified.

[0139] S507. If the conversion efficiency is less than the preset conversion efficiency qualification threshold, or the uniformity is greater than the preset uniformity threshold, the photovoltaic module is deemed unqualified.

[0140] If the conversion efficiency is less than the preset conversion efficiency qualification threshold, or the uniformity is greater than the preset uniformity threshold, the photovoltaic module is deemed unqualified. This indicates that some areas of the light conversion film 14 of the photovoltaic module 1 cannot perform effective light conversion, or the light conversion efficiency between different points of the light conversion film 14 is significantly different. In this case, the photovoltaic module is deemed unqualified and can be sent to the rework or cutting station through the shunting device.

[0141] S508. Obtain the current photovoltaic module's specification information; store the current photovoltaic module's conversion efficiency and uniformity, along with its corresponding specification information, into the data storage unit.

[0142] When a photovoltaic module is deemed qualified, its specifications can be obtained, and the conversion efficiency and uniformity of the current photovoltaic module, along with its corresponding specifications, can be stored in a data storage unit for production batch traceability.

[0143] S509, The alarm control unit triggers an alarm.

[0144] When a photovoltaic module is determined to be defective, the alarm unit can be controlled to trigger an alarm to remind the relevant operators.

[0145] Optionally, Figure 9 A schematic flowchart of another online detection method for the light conversion film of a photovoltaic module provided in an embodiment of the present invention is shown below. Figure 9 As shown, the online detection method also includes a calibration process, which precedes the detection process. The calibration process of the online detection method includes: S601. Obtain standard specification information corresponding to multiple photovoltaic standard parts.

[0146] S602. Based on the standard specification information, determine the standard dynamic calibration coefficient corresponding to each photovoltaic standard component.

[0147] In steps S601 and S602, standard specification information corresponding to multiple photovoltaic standard components is obtained. This standard specification information includes the width, thickness, standard top luminous intensity signal Isc0, standard side luminous intensity signal Ied0, and standard conversion efficiency q0 of each photovoltaic standard component. Then, according to the formula k0 = q0 / (Isc0 + Ied0), the standard dynamic calibration coefficient k0 corresponding to each photovoltaic standard component can be determined. The width of the photovoltaic standard component can range from 1 to 2 m, and the thickness can range from 30 to 50 mm. For example, the standard top luminous intensity signal Isc0 is 12000 μW / cm². 2 The standard side effusive intensity signal Ied0 is 6000 μW / cm. 2 When the standard conversion efficiency q0 is 85%, the calculated standard dynamic calibration coefficient k0 is 0.00472.

[0148] S603. Generate dynamic standard coefficients for photovoltaic modules with arbitrary specification information based on standard specification information and standard dynamic calibration coefficients.

[0149] After determining the standard specifications and dynamic calibration coefficient k0 of photovoltaic standard components, dynamic standard coefficients corresponding to photovoltaic modules with arbitrary specifications can be generated based on lightweight convolutional neural networks and transfer learning. For example, the network can have 5 layers, and the parameter size can be controlled within 1.2 GB to adapt to industrial edge device deployment. Thus, when subsequently inspecting photovoltaic modules with arbitrary specifications, the dynamic standard coefficients corresponding to the photovoltaic module can be determined based on the module's width and thickness information. Furthermore, based on the dynamic calibration coefficients and the detected first top light intensity signal and first side radiant light intensity signal, the conversion efficiency and uniformity of the photovoltaic module's light conversion film at each first detection point can be determined.

[0150] This invention utilizes a lightweight convolutional neural network and transfer learning to achieve rapid output of dynamic calibration coefficients for photovoltaic modules of arbitrary width and thickness, eliminating the need for manual recalibration. Calibration time is ≤0.5s, improving production line changeover efficiency. Simultaneously, employing a top signal acquisition unit and an edge signal acquisition unit with a sampling frequency of 5 points / second, the entire algorithm's processing latency is ≤50ms, and the single-module detection time is ≤30 seconds, perfectly matching the typical speed of photovoltaic module production lines (≤5m / min). This enables continuous online detection without affecting production efficiency.

[0151] Optionally, Figure 10 A schematic flowchart of another online detection method for the light conversion film of a photovoltaic module provided in an embodiment of the present invention is shown below. Figure 10 As shown, the online detection method also includes a testing process, which is located between the calibration process and the detection process. The testing process includes: S701, control multiple top excitation light source units and multiple edge excitation light source units to project the first wavelength light onto the upper surface and edge of the photovoltaic standard component respectively.

[0152] S702, Acquire the first top light intensity signal output by multiple top signal acquisition units.

[0153] S703: Acquire the first-side luminous intensity signal output by multiple edge signal acquisition units.

[0154] S704. Obtain the standard specification information and standard dynamic calibration coefficients corresponding to photovoltaic standard parts.

[0155] S705. Calculate the test dynamic calibration coefficient based on the first top light intensity signal, the first side light intensity signal, and standard specification information.

[0156] S706. Calculate the third difference between the test dynamic calibration coefficient and the standard dynamic calibration coefficient, and determine that the third difference is less than the preset test difference.

[0157] For steps S701-S706, before testing any photovoltaic module, it is necessary to ensure the accuracy of the online testing device. Therefore, multiple top excitation light source units and multiple edge excitation light source units can be controlled to project first wavelength light onto the upper surface and edge of the photovoltaic standard component, respectively, and the first top light intensity signal Isc0' output by multiple top signal acquisition units and the first side radiant light intensity signal Ied0' output by multiple edge signal acquisition units can be acquired. Further, the standard specification information and standard dynamic calibration coefficient k0 corresponding to the photovoltaic standard component are acquired. The standard specification information includes the standard conversion efficiency q0 corresponding to the photovoltaic standard component. The test dynamic calibration coefficient k' is calculated according to the formula k'=q0 / (Isc0'+Ied0'). Then, the third difference between the test dynamic calibration coefficient k' and the standard dynamic calibration coefficient k0 is calculated. When the third difference is less than the preset test difference, it is determined that the online testing device has good testing accuracy.

[0158] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An online testing device for the light conversion film of a photovoltaic module, characterized in that, The photovoltaic module includes a backsheet, a first encapsulating film, multiple solar cells, a second encapsulating film, a light conversion film, and transparent glass stacked in sequence; the online detection device includes a conveyor roller, a detection cover, multiple top excitation light source units, multiple top signal acquisition units, multiple edge excitation light source units, multiple edge signal acquisition units, and a processing unit; The photovoltaic module is located on the conveyor roller conveyor, which is used to convey the photovoltaic module along a first horizontal direction; The detection cover has an openable and closable entrance / exit on its side wall along the first horizontal direction; The top excitation light source unit and the top signal acquisition unit are both located on the top inner wall of the detection cover, and the edge excitation light source unit and the edge signal acquisition unit are both located on the inner side wall of the detection cover along the second horizontal direction; wherein, the second horizontal direction intersects with the first horizontal direction; The processing unit is connected to both the plurality of top excitation light source units and the plurality of edge excitation light source units, and is used to control the plurality of top excitation light source units to project a first wavelength light onto the upper surface of the photovoltaic module, and to control the plurality of edge excitation light source units to project a first wavelength light onto the edge of the photovoltaic module. The light conversion film is used to receive the first wavelength light and convert the first wavelength light into the second wavelength light; The processing unit is also connected to the plurality of top signal acquisition units, and is used to control the plurality of top signal acquisition units to detect the intensity of the second wavelength light projected by the plurality of first detection points on the upper surface of the photovoltaic module, and generate a first top light intensity signal. The processing unit is also connected to the plurality of edge signal acquisition units, and is used to control the plurality of edge signal acquisition units to detect the intensity of the second wavelength light projected by the plurality of second detection points on the edge of the photovoltaic module, and generate a first side luminescence intensity signal; wherein any one of the second detection points and at least one of the first detection points are located in the same vertical plane, and the vertical plane is perpendicular to the first horizontal direction; The processing unit is also connected to the plurality of top signal acquisition units and the plurality of edge signal acquisition units, and is used to determine the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the first top light intensity signal and the first side light intensity signal.

2. The online detection device according to claim 1, characterized in that, The plurality of top signal acquisition units are arranged in n columns along the first horizontal direction and in m rows along the second horizontal direction on the top inner wall of the detection cover; wherein n and m are both positive integers greater than or equal to 1; The plurality of edge signal acquisition units include n first edge signal acquisition units and n second edge signal acquisition units; The n first edge signal acquisition units and the n second edge signal acquisition units are respectively located on two opposite inner sidewalls of the detection cover along the second horizontal direction; the i-th first edge signal acquisition unit, the i-th second edge signal acquisition unit and the i-th column of the top signal acquisition unit are located in the same vertical plane; where i is a positive integer from 1 to n; The processing unit is connected to the n first edge signal acquisition units and is used to control the n first edge signal acquisition units to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module, and generate a second side luminescence intensity signal. The processing unit is also connected to the n second edge signal acquisition units, and is used to control the n second edge signal acquisition units to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module, and generate a third side luminous intensity signal. The processing unit is further configured to determine the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal and the third side efflux intensity signal.

3. The online detection device according to claim 2, characterized in that, The processing unit is also configured to, when none of the plurality of top excitation light source units and the plurality of edge excitation light source units project the first wavelength light, control the plurality of top signal acquisition units, the n first edge signal acquisition units and the n second edge signal acquisition units to detect the ambient background light intensity inside the detection cover and generate an ambient background light signal. The processing unit is further configured to determine the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, the third side efflux intensity signal and the ambient background light signal.

4. The online detection device according to claim 1, characterized in that, It also includes a cleaning module, which is located on the side of the detection cover opposite to the first horizontal direction; The cleaning module includes a high-pressure nitrogen purging unit and a soft brush unit; The high-pressure nitrogen purging unit is used to remove dust from the surface of the photovoltaic module; the soft brush unit is used to clean residual impurities on the surface of the photovoltaic module.

5. The online detection device according to claim 1, characterized in that, The processing unit is further configured to determine that the photovoltaic module is qualified when the conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and the uniformity is less than or equal to a preset uniformity threshold; It is also used to determine that the photovoltaic module is unqualified when the conversion efficiency is less than the preset conversion efficiency qualification threshold or the uniformity is greater than the preset uniformity threshold.

6. The online detection device according to claim 5, characterized in that, It also includes an alarm unit and a data storage unit; the processing unit is connected to the alarm unit and the data storage unit respectively; The processing unit is used to generate an alarm signal when the photovoltaic module is determined to be defective; The alarm unit is used to trigger an alarm when the alarm signal is received; The processing unit is used to generate a storage signal when the photovoltaic module is determined to be qualified; The data storage unit is used to obtain and store the conversion efficiency and uniformity corresponding to the photovoltaic module when the storage signal is received.

7. The online detection device according to claim 1, characterized in that, The inner wall of the detection cover is lined with a matte black light-absorbing material; and / or The irradiance of the plurality of top excitation light source units is 1.0~2.0 mW / cm². 2 ; and / or, The plurality of top excitation light source units all illuminate the photovoltaic module at an angle, and the angle between the first wavelength light projected and the surface of the photovoltaic module is 25°~35°.

8. The online detection device according to claim 1, characterized in that, The first wavelength range is 280-400nm; the second wavelength range is 500-700nm.

9. The online detection device according to claim 1, characterized in that, It also includes a lifting drive unit; the lifting drive unit is connected to the detection cover and is used to adjust the distance between the detection cover and the conveyor roller in the vertical direction, and to control the opening and closing of the openable inlet and outlet, so that the photovoltaic module can be detected inside the detection cover.

10. An online testing method for the light conversion film of a photovoltaic module, characterized in that, The online testing method is performed using the photovoltaic module light conversion film online testing device as described in any one of claims 1-9, wherein the online testing method includes a testing process; the testing process includes: Control the plurality of top excitation light source units to project a first wavelength of light onto the upper surface of the photovoltaic module; Control the plurality of edge excitation light source units to project a first wavelength of light onto the edge of the photovoltaic module; The multiple top signal acquisition units are controlled to detect the intensity of the second wavelength light projected from multiple first detection points on the upper surface of the photovoltaic module, and generate a first top light intensity signal. The plurality of edge signal acquisition units are controlled to detect the intensity of the second wavelength light projected by a plurality of second detection points on the edge of the photovoltaic module, and generate a first side luminescence intensity signal; wherein any one of the second detection points and at least one of the first detection points are located in the same vertical plane, and the vertical plane is perpendicular to the first horizontal direction; Based on the known dynamic calibration coefficient, the first top light intensity signal, and the first side eclipse intensity signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined.

11. The online detection method according to claim 10, characterized in that, The plurality of top signal acquisition units are arranged in n columns along the first horizontal direction and in m rows along the second horizontal direction on the top inner wall of the detection cover; where n and m are both positive integers greater than or equal to 1; the plurality of edge signal acquisition units include n first edge signal acquisition units and n second edge signal acquisition units; the n first edge signal acquisition units and the n second edge signal acquisition units are respectively located on two opposite inner sidewalls of the detection cover along the second horizontal direction; the i-th first edge signal acquisition unit, the i-th second edge signal acquisition unit and the i-th column of the top signal acquisition units are located in the same vertical plane; where i is a positive integer from 1 to n; Controlling the plurality of edge signal acquisition units to detect the intensity of the second wavelength light projected from a plurality of second detection points on the edge of the photovoltaic module, and generating a first side luminescence intensity signal, includes: The n first edge signal acquisition units are controlled to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module, and a second side luminescence intensity signal is generated. The n second edge signal acquisition units are controlled to detect the intensity of the second wavelength light projected by multiple second detection points on the edge of the photovoltaic module, and a third side luminescence intensity signal is generated. Based on the known dynamic calibration coefficients, the first top light intensity signal, and the first side efflux intensity signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined, including: Based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, and the third side efflux intensity signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined.

12. The online detection method according to claim 11, characterized in that, Before determining the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, and the third side efflux intensity signal, the method further includes: Acquire the ambient background light signals output by the plurality of top signal acquisition units, the n first edge signal acquisition units, and the n second edge signal acquisition units; Based on the known dynamic calibration coefficients, the first top light intensity signal, the second side efflux intensity signal, and the third side efflux intensity signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined, including: Based on the known dynamic calibration coefficient, the first top light intensity signal, the second side efflux intensity signal, the third side efflux intensity signal, and the ambient background light signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined.

13. The online detection method according to claim 12, characterized in that, Based on the known dynamic calibration coefficients, the first top light intensity signal, the second side efflux intensity signal, the third side efflux intensity signal, and the ambient background light signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined, including: The first top light intensity signal, the second side emanating light intensity signal, and the third side emanating light intensity signal are all subjected to noise reduction processing to obtain the second top light intensity signal, the fourth side emanating light intensity signal, and the fifth side emanating light intensity signal, respectively. The second top light intensity signal, the fourth side emitting light intensity signal, and the fifth side emitting light intensity signal are all corrected to obtain the third top light intensity signal, the sixth side emitting light intensity signal, and the seventh side emitting light intensity signal, respectively. Based on the known dynamic calibration coefficient, the third top light intensity signal, the sixth side luminous intensity signal, the seventh side luminous intensity signal, and the ambient background light signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined.

14. The online detection method according to claim 13, characterized in that, The first top light intensity signal, the second side emitting light intensity signal, and the third side emitting light intensity signal are all subjected to noise reduction processing to obtain the second top light intensity signal, the fourth side emitting light intensity signal, and the fifth side emitting light intensity signal, respectively, including: Variational mode decomposition is performed on the first top light intensity signal, the second side efflux intensity signal, and the third side efflux intensity signal to generate multiple corresponding intrinsic mode functions. Calculate the envelope entropy and sample entropy of each intrinsic mode function, and calculate the composite entropy corresponding to each intrinsic mode function by weighted summation; Remove the intrinsic mode function corresponding to the maximum value of the composite entropy, and reconstruct the remaining intrinsic mode functions to obtain the second top light intensity signal, the fourth side luminous intensity signal, and the fifth side luminous intensity signal, respectively.

15. The online detection method according to claim 13, characterized in that, The second top light intensity signal, the fourth side emitting light intensity signal, and the fifth side emitting light intensity signal are all corrected to obtain the third top light intensity signal, the sixth side emitting light intensity signal, and the seventh side emitting light intensity signal, respectively, including: The cell regions in the photovoltaic module are determined based on the preset cell characteristic threshold, the second top light intensity signal, the fourth side luminous intensity signal, and the fifth side luminous intensity signal. The second top light intensity signal located at the first detection point within the battery cell area is subjected to weighted smoothing processing to obtain the third top light intensity signal; The fourth-side luminescence intensity signal and the fifth-side luminescence intensity signal located at the second detection point within the cell area are weighted and smoothed to obtain the sixth-side luminescence intensity signal and the seventh-side luminescence intensity signal.

16. The online detection method according to claim 15, characterized in that, Based on the known dynamic calibration coefficients, the third top light intensity signal, the sixth side efflux intensity signal, the seventh side efflux intensity signal, and the ambient background light signal, the conversion efficiency of the light conversion film at each of the first detection points and the uniformity of the light conversion film are determined, including: The ambient background light signal intensity is obtained by calculating the average value of the ambient background light signals output by the plurality of top signal acquisition units, the n first edge signal acquisition units, and the n second edge signal acquisition units. Based on the third top light intensity signal, determine the reflected light intensity at the first detection point corresponding to the surface of the photovoltaic module; The average value of the sixth-side luminescence intensity signal and the seventh-side luminescence intensity signal corresponding to the second detection point located in the same vertical plane as the first detection point on the surface of the photovoltaic module is calculated to obtain the side luminescence signal intensity. The conversion efficiency of the light conversion film at each of the first detection points on the surface of the photovoltaic module is calculated according to the formula q=k×(Isc+Ied-Ib); where q is the conversion efficiency, k is the known dynamic calibration coefficient, Isc is the reflected light intensity at any detection point on the surface of the photovoltaic module, Ied is the side efflux signal intensity corresponding to the column where any detection point on the surface of the photovoltaic module is located, and Ib is the ambient background light signal intensity. Calculate a first difference in the conversion efficiency of two adjacent first detection points within the cell area, and calculate a second difference in the conversion efficiency of two adjacent first detection points outside the cell area, and take the maximum value of the first difference and the second difference as the uniformity of the light conversion film.

17. The online detection method according to claim 10, characterized in that, After determining the conversion efficiency and uniformity of the light conversion film at each of the first detection points based on the known dynamic calibration coefficient, the first top light intensity signal, and the plurality of first side effusive light intensity signals, the method further includes: The photovoltaic module is deemed qualified when the conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and the uniformity is less than or equal to a preset uniformity threshold. The photovoltaic module is deemed unqualified when the conversion efficiency is less than the preset conversion efficiency qualification threshold or the uniformity is greater than the preset uniformity threshold.

18. The online detection method according to claim 17, characterized in that, The online detection device further includes an alarm unit and a data storage unit; the processing unit is connected to the alarm unit and the data storage unit respectively; After determining that the photovoltaic module is qualified when the conversion efficiency is greater than or equal to a preset conversion efficiency qualification threshold and the uniformity is less than or equal to a preset uniformity threshold, the method further includes: Obtain the specification information of the current photovoltaic module; store the conversion efficiency and uniformity of the current photovoltaic module and their corresponding specification information in the data storage unit; After determining that the photovoltaic module is unqualified when the conversion efficiency is less than the preset conversion efficiency pass threshold or the uniformity is greater than the preset uniformity threshold, the method further includes: The alarm unit is controlled to trigger an alarm.

19. The online detection method according to claim 10, characterized in that, The online detection method further includes a calibration process, which precedes the detection process. The calibration process includes: Obtain standard specification information for multiple photovoltaic standard components; Based on the standard specification information, determine the standard dynamic calibration coefficient corresponding to each photovoltaic standard component; Based on the standard specification information and the standard dynamic calibration coefficient, a dynamic standard coefficient corresponding to the photovoltaic module with arbitrary specification information is generated.

20. The online detection method according to claim 19, characterized in that, The online detection method further includes a testing process, which is located between the calibration process and the detection process; The testing process includes: The plurality of top excitation light source units and the plurality of edge excitation light source units are controlled to project a first wavelength of light onto the upper surface and edge of the photovoltaic standard component, respectively; Acquire the first top light intensity signal output by the plurality of top signal acquisition units; Acquire the first-side luminous intensity signal output by the plurality of edge signal acquisition units; Obtain the standard specification information and standard dynamic calibration coefficient corresponding to the photovoltaic standard component; Calculate the test dynamic calibration coefficient based on the first top light intensity signal, the first side emanating light intensity signal, and the standard specification information; Calculate the third difference between the test dynamic calibration coefficient and the standard dynamic calibration coefficient, and determine that the third difference is less than a preset test difference.

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