Photovoltaic glass and manufacturing process
By combining a single-layer glass structure with a high-performance encapsulation film and backsheet, the problems of high production cost, low efficiency, and poor reliability of double-layer glass structures are solved, realizing the combination of high-efficiency photovoltaic power generation and architectural aesthetics, which is suitable for building-integrated photovoltaics applications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CSG PVTECH
- Filing Date
- 2026-03-16
- Publication Date
- 2026-07-14
Smart Images
Figure CN122396054A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building-integrated photovoltaics (BIPV) technology, and more particularly to a photovoltaic power generation glass and its manufacturing process. Background Technology
[0002] With the development of Building Integrated Photovoltaics (BIPV), BIPV glass differs from ordinary photovoltaic glass. It not only needs to meet the light transmission and weather resistance requirements of photovoltaic power generation, but also needs to possess the high structural strength, safety protection, and aesthetic appeal required of building materials. The thickness and performance standards of this glass are far higher than those of ordinary photovoltaic glass. Currently, the mainstream BIPV product in the building sector is double-layer photovoltaic glass based on traditional laminated glass technology. A typical structure consists of 6mm or thicker ultra-clear tempered glass + PVB film + solar cells + PVB film + 6mm or thicker ultra-clear tempered glass, achieving a combination of building safety and photovoltaic power generation through the double-layer thick glass composite.
[0003] This type of double-layer thick glass structure requires a high-pressure autoclave process, resulting in high production costs and low efficiency. Furthermore, due to the excessive glass thickness, the bottom heating time in the laminator needs to be extended to ensure uniform heating of the thick glass, leading to high energy consumption and long processing time. Additionally, the PVB film lamination process is prone to air bubbles, requiring rework in the high-pressure autoclave for repair, further increasing costs. Moreover, this double-layer thick glass structure has insufficient power generation performance; the low light transmittance of the PVB film reduces the photoelectric conversion efficiency of the solar cells. Summary of the Invention
[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a photovoltaic power generation glass that adopts a single-layer glass structure, which can simultaneously meet the requirements of structural strength, architectural aesthetics, and photovoltaic power generation efficiency.
[0005] The present invention also proposes a manufacturing process for preparing the above-mentioned photovoltaic power generation glass.
[0006] According to a first aspect of the present invention, a photovoltaic power generation glass includes a glass sheet, a front encapsulating film, a battery cell, a rear encapsulating film, and a back sheet arranged sequentially along the thickness direction of the photovoltaic power generation glass. The front encapsulation film is made of POE material, or the front encapsulation film has a multi-layer structure, with at least one layer made of POE material; the rear encapsulation film is made of EVA material; the backsheet includes a substrate layer and a functional coating, the functional coating being applied at least to the side of the substrate layer facing the rear encapsulation film, and the functional coating being able to reflect light to the battery cell.
[0007] The photovoltaic glass according to embodiments of the present invention has at least the following beneficial effects: This application, through the collaborative design of the laminated structure of photovoltaic (PV) glass and the encapsulation materials of each layer, forms an integrated structural solution of "single-layer glass + high-transmittance anti-PID front encapsulant film + high-efficiency solar cells + low-acid anti-corrosion rear encapsulant film + high-reflectivity weather-resistant backsheet". This solution not only specifically addresses the technical shortcomings of existing double-layer glass PVB encapsulant film structures, such as high production costs, low production efficiency, insufficient power generation performance, and poor long-term reliability, but also fully integrates the usage requirements of building-integrated photovoltaics (BIPV), balancing the structural strength of the PV glass, its compatibility with architectural aesthetics, and its PV power generation efficiency. The performance advantages of each layer of materials complement each other and synergistically enhance each other, reducing production energy consumption and manufacturing costs while improving the photoelectric conversion efficiency and outdoor service life of the PV glass. This meets the long-term use standards for PV glass and achieves the integration of photovoltaic functionality and building material attributes.
[0008] Furthermore, the POE or EPE film on the front side has high light transmittance, which can improve the transmittance of incident light and allow more photons to reach the surface of the solar cell. While N-type solar cells such as BC / TOPCon efficiently absorb light to generate electricity, some light passes through the solar cell without being completely absorbed. The high light transmittance of the EVA film on the back side can reduce the loss of light that penetrates the solar cell, allowing it to reach the backsheet. After being reflected by the functional coating of the backsheet, it passes through the solar cell again, realizing secondary absorption of light and power generation, thus improving the photoelectric conversion efficiency of photovoltaic glass.
[0009] According to some embodiments of the present invention, the glass sheet includes an outer surface facing away from the front encapsulating film and an inner surface that is bonded to the front encapsulating film, wherein the outer surface is surface treated by an acid pickling process.
[0010] According to some embodiments of the present invention, the inner surface is provided with a printing layer, the printing layer being configured to present a set color and / or a set pattern.
[0011] According to some embodiments of the present invention, the battery cell is a BC battery cell, the BC battery cell including a first surface with grid lines and a second surface without grid lines, the second surface being disposed facing the glass sheet.
[0012] According to some embodiments of the present invention, the functional coating on the side facing the rear encapsulating film is a high-reflectivity coating, wherein the high-reflectivity coating has a reflectivity of not less than 65% in the 780nm to 1100nm wavelength band.
[0013] The manufacturing process according to a second aspect embodiment of the present invention includes the following steps: S100, Glass sheets, front-side encapsulating film and battery cells are laid sequentially on the support platform; S200, The support frame is fitted onto the outer periphery of the glass sheet; S300, Lay out the rear sealing film and the back plate in sequence, and make the edge of the rear sealing film and the edge of the back plate overlap the support frame; S400, perform lamination to connect the glass sheet, the front encapsulation film, the battery cell, the rear encapsulation film, and the backplate into an integral structure; S500: Remove the support frame and remove the excess rear sealing film and backplate.
[0014] According to some embodiments of the present invention, the glass sheet includes an outer surface facing away from the front encapsulating film, and the preparation process of the glass sheet includes the following steps: The outer surface is treated by an acid pickling process.
[0015] According to some embodiments of the present invention, the glass sheet includes an inner surface facing the front encapsulating film, and the preparation process of the glass sheet further includes the following steps: Select the ink color you want to use; The ink is used to print on the inner surface to give the glass sheet a predetermined color.
[0016] According to some embodiments of the present invention, the support frame is made of metal material, the support frame includes a support surface that abuts against the rear encapsulating film, and at least the support surface is provided with an anti-stick coating or anti-stick tape.
[0017] According to some embodiments of the present invention, the height of the support surface is not lower than the surface of the glass sheet used to adhere to the front encapsulation film.
[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of the photovoltaic glass according to an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 This is a schematic diagram of a support frame surrounding the outer periphery of a photovoltaic glass according to an embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of region B in the middle; Figure 5 This is a plan view of the photovoltaic glass according to an embodiment of the present invention.
[0020] Figure label: Glass slide 100; Front sealing film 200; 300 solar cells; Rear sealing film 400; Back panel 500; Support frame 600. Detailed Implementation
[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.
[0023] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.
[0025] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0026] With the development of Building Integrated Photovoltaics (BIPV), BIPV glass differs from ordinary photovoltaic glass. It not only needs to meet the light transmission and weather resistance requirements of photovoltaic power generation, but also needs to meet the requirements of high structural strength, safety protection, and aesthetic decoration of building materials. The thickness and performance standards of this glass are far higher than those of ordinary photovoltaic glass. Currently, the mainstream BIPV product in the building sector is double-layer photovoltaic glass based on traditional laminated glass technology. A typical structure consists of 6mm or thicker ultra-clear tempered glass + PVB film (polyvinyl butyral film) + solar cells + PVB film + 6mm or thicker ultra-clear tempered glass, achieving a combination of building safety and photovoltaic power generation through this double-layer thick glass composite.
[0027] This type of double-layer thick glass structure requires a high-pressure autoclave process, resulting in high production costs and low efficiency. Furthermore, due to the excessive glass thickness, the bottom heating time in the laminator needs to be extended to ensure uniform heating of the thick glass, leading to high energy consumption and long processing time. Additionally, the PVB film lamination process is prone to air bubbles, requiring rework in the high-pressure autoclave for repair, further increasing costs. Moreover, this double-layer thick glass structure has insufficient power generation performance; the low light transmittance of the PVB film reduces the photoelectric conversion efficiency of the solar cells.
[0028] In response to the above problems, such as Figure 1 and Figure 2 As shown, this application proposes a photovoltaic (PV) power generation glass, including a glass sheet 100, a front encapsulating film 200, a solar cell 300, a rear encapsulating film 400, and a backplate 500. Along the thickness direction of the PV power generation glass, the glass sheet 100, the front encapsulating film 200, the solar cell 300, the rear encapsulating film 400, and the backplate 500 are arranged sequentially. Unlike existing technologies that use a double-layer thick glass composite with a PVB film, this application employs a single-layer glass lamination scheme with a high-performance encapsulating film and a backplate 500. This effectively reduces the thickness of the PV power generation glass, thereby shortening the heat transfer time during the lamination process and saving energy. Furthermore, compared to existing double-layer glass structures that require an autoclave process, the single-layer glass structure used in this application is compatible with conventional lamination equipment. The atmospheric pressure and flat plate heating of the PV laminator allow the film to be uniformly heated and leveled, and air bubbles between the glass and the film can be easily expelled. This eliminates the need for an additional high-cost autoclave, significantly reducing production costs and improving production efficiency.
[0029] Specifically, the glass sheet 100 of this application uses acid-washed tempered glass with colored glaze or ultra-clear tempered glass with a thickness of 4mm to 8mm. It has good light transmittance, mechanical strength, and weather resistance, meeting the standards for building safety glass while also taking into account the needs of photovoltaic power generation. Acid-washed tempered glass with colored glaze can present rich colors and textures, enhancing the decorative effect of building facades and making it suitable for applications of building-integrated photovoltaics.
[0030] The front encapsulation film 200 is made of POE (polyolefin elastomer). The POE molecular chain has a non-polar saturated structure (ethylene copolymerized with α-olefins). It is produced by copolymerizing ethylene with α-olefins (such as 1-octene) using a metallocene catalyst, forming a soft and hard segment structure of "crystalline ethylene segments + amorphous α-olefin segments." The crystalline segments provide strength, while the amorphous segments impart elasticity. The molecular chain contains no easily degradable ester groups or tertiary carbon atoms, resulting in high stability and resistance to light, heat, and humidity. It has no polar groups and does not interact with water molecules, providing good water vapor barrier properties; its volume resistivity is high (maintaining 10¹ at 85℃). 5 (Above Ω·cm) can effectively prevent sodium ion enrichment and reduce PID decay (Potential Induced Degradation).
[0031] Compared to traditional PVB films, POE films offer higher light transmittance and superior water vapor resistance, significantly improving the photoelectric conversion efficiency of the solar cell 300 and extending the lifespan of photovoltaic glass. It should be noted that the front encapsulation film 200 can be a single-layer film entirely composed of POE material, or a multi-layer composite film structure formed by co-extruding POE with other polymer materials, with at least one layer made of POE. For example, the multi-layer composite film structure can be a three-layer composite structure of EVA-POE-EVA (also known as EPE), which retains the high barrier properties of POE while improving the processing performance of pure POE and balancing costs. POE serves as the core layer for water blocking and PID resistance, primarily responsible for blocking water vapor and suppressing the PID effect. Its high water resistance and high volume resistivity directly determine the weather resistance and PID resistance of the EPE film. EVA, as an adhesive layer, utilizes its high adhesion and ease of processing to solve the problem of easy movement of the solder ribbon and solar cell 300 during POE film lamination, while ensuring a tight bond between the various layers of photovoltaic glass.
[0032] Cell 300 uses either BC (back-contact) cells or TOPCon cells (a type of tunneling oxide passivated contact solar cell based on N-type silicon wafers), offering higher conversion efficiency and lower light-induced degradation characteristics. It is particularly well-suited to the dual requirements of optical performance and reliability in single-layer glass structures. When cell 300 is a BC cell, its grid lines are distributed on the back side, resulting in a uniform appearance with no grid lines obstructing the front. This significantly improves the product's aesthetics, allowing it to better integrate into buildings and is suitable for building-integrated photovoltaics (BIPV) applications.
[0033] The rear encapsulation film 400 is made of EVA material (ethylene / vinyl acetate). EVA itself has excellent adhesion and processing fluidity, enabling it to form a strong adhesive seal with the solar cell 300 and backsheet 500. It is suitable for atmospheric pressure lamination processes and works in conjunction with the front encapsulation film 200 to achieve tight bonding of the various layers of the photovoltaic glass. Specifically, the low-acid EVA film selected in this application is a modified and optimized version of traditional EVA films. By reducing the vinyl acetate content, adding a special acid absorber, and optimizing the molecular cross-linking structure, the content of easily hydrolyzed ester groups in the molecular chain is significantly reduced, effectively suppressing the release of acetic acid from the film under humid and hot aging conditions. It should be noted that the acid value of low-acid EVA is 5-20 ppm, while that of ordinary EVA is 20-50 ppm. The hydrolytic acetic acid release of low-acid EVA after 1000 hours of damp heat aging testing is 10-50 ppm, while that of ordinary EVA is 50-100 ppm. Therefore, the acid value and acid release of low-acid EVA are significantly lower than the standards for traditional EVA films. This low-acid characteristic effectively prevents acidic substances from corroding the 300 grid lines of the solar cell, making it particularly suitable for the BC and TOPCon N-type high-efficiency solar cells 300 described in this application. Simultaneously, the volume resistivity of the low-acid EVA film is significantly improved, forming a double-layer water-blocking and anti-PID synergistic protective structure with the front POE film. This further blocks moisture intrusion and ion migration paths, fundamentally reducing the risk of PID degradation in photovoltaic glass, balancing adhesion reliability and long-term weather resistance, making it suitable for building-integrated photovoltaic applications.
[0034] The backsheet 500 includes a substrate layer and a functional coating. The functional coating is applied at least to the side of the substrate layer facing the rear encapsulating film 400, reflecting light to the solar cell 300 to improve light energy utilization, while also possessing excellent resistance to ultraviolet radiation and damp heat aging. For example, the substrate layer can be a PET polyester film, providing mechanical support and electrical insulation; the functional coating can be composed of fluorine-containing materials (PVF, PVDF, etc.) or highly reflective, weather-resistant materials such as titanium dioxide, effectively enhancing the light reflectivity and environmental tolerance of the backsheet 500, ensuring stable performance under long-term outdoor use, thereby significantly improving the reliability and power generation gain of photovoltaic glass in complex environments.
[0035] It is worth noting that this application, through the collaborative design of the laminated structure of photovoltaic (PV) glass and the encapsulation materials of each layer, forms an integrated structural solution of "single-layer glass + high-transmittance anti-PID front encapsulating film + high-efficiency solar cell 300 + low-acid anti-corrosion rear encapsulating film + high-reflectivity weather-resistant backsheet 500". This solution not only specifically addresses the technical shortcomings of existing double-layer glass PVB encapsulating film structures, such as high production cost, low production efficiency, insufficient power generation performance, and poor long-term reliability, but also fully integrates the usage requirements of building-integrated photovoltaics (BIPV), balancing the structural strength of PV glass, architectural aesthetics, and PV power generation efficiency. The performance advantages of each layer of materials complement each other and synergistically enhance each other, reducing production energy consumption and manufacturing costs while improving the photoelectric conversion efficiency and outdoor service life of PV glass. This meets the long-term use standards for PV glass, achieving the integration of photovoltaic functionality and building material attributes, and is suitable for BIPV application scenarios.
[0036] Furthermore, the POE or EPE film on the front side has high light transmittance, which can improve the transmittance of incident light and allow more photons to reach the surface of the solar cell 300. While the N-type solar cell 300 such as BC / TOPCon efficiently absorbs light to generate electricity, some light passes through the solar cell 300 and is not completely absorbed. The high light transmittance of the EVA film on the back side can reduce the loss of light passing through the solar cell 300, so that it can reach the back sheet 500. After being reflected by the functional coating of the back sheet 500, it passes through the solar cell 300 again, realizing secondary absorption of light and power generation, thus improving the photoelectric conversion efficiency of photovoltaic glass.
[0037] In some embodiments, as described above, the glass sheet 100 can be acid-washed tempered glass with colored enamel coating. The glass sheet 100 includes an outer surface facing away from the front sealing film 200 and an inner surface that is adhered to the front sealing film 200. The outer surface can be acid-washed to create a micro-roughened structure, thereby effectively scattering incident light, reducing light reflection loss, avoiding glare from affecting the surrounding environment, and improving the visual comfort of the building facade. The roughness of the acid-washed outer surface can be Ra0.9~Ra2μm, a roughness range that ensures good diffuse reflection while effectively avoiding dust accumulation caused by excessive surface roughness.
[0038] Furthermore, a printing layer is provided on the inner surface of the glass sheet 100, which is configured to display a set color and / or a set pattern. For example, a 200-300 mesh polyester screen can be used to print translucent high-temperature ink, which, after tempering, forms the aforementioned acid-washed colored enamel tempered glass. The color and pattern of the printing layer can be designed according to architectural aesthetic requirements, achieving integration of the building's appearance with photovoltaic power generation functionality, suitable for building-integrated photovoltaics (BIPV) applications.
[0039] In some embodiments, the solar cell 300 is a BC solar cell, which is a back-contact N-type high-efficiency photovoltaic cell. Its grid lines, electrodes, and other conductive structures are concentrated on the first surface of the solar cell 300 facing away from the glass sheet 100. The second surface of the solar cell 300 facing the glass sheet 100 is a flat light-receiving surface without grid lines or electrodes. Therefore, the grid-free second surface can maximize the reception of incident light, eliminating the light-blocking loss caused by the grid lines on the front of the traditional solar cell 300, significantly improving light utilization and photoelectric conversion efficiency compared to conventional solar cells 300. Furthermore, the second surface of the BC solar cell has no metal grid lines, preventing the formation of light spots due to grid line obstruction. As architectural glass, it can exhibit a consistent appearance color, significantly improving the product's appearance and allowing it to better integrate with the building. Simultaneously, the BC solar cell has a reasonable light transmittance, allowing unabsorbed light to penetrate to the rear backsheet 500 while efficiently absorbing light to generate electricity, providing the prerequisite for secondary reflection and power generation from the backsheet 500.
[0040] In some embodiments, the functional coating on the side of the encapsulating film 400 facing the rear is a high-reflectivity black coating. This high-reflectivity black coating has a reflectivity of not less than 65% in the 780nm to 1100nm wavelength range, and no reflection in the forward wavelength range. This high-reflectivity black coating has excellent optical reflection performance, efficiently reflecting sunlight that has not been absorbed by the solar cell 300, allowing it to pass back through the solar cell 300 for secondary absorption, further improving photoelectric conversion efficiency. In addition, the black coating can create a harmonious visual effect with the building facade design, enhancing the overall aesthetics.
[0041] The second aspect of this application provides a manufacturing process for photovoltaic power generation glass, which includes the following steps: S100, glass sheet 100, front sealing film 200 and battery cell 300 are sequentially laid on the support platform; It should be explained that the support platform can be a fixed platform used to support and position the glass sheet 100, the encapsulating film, and the battery cell 300, or it can be a mobile platform set on the production line, entering the laminator for the lamination process after each layer of the structure is laid. The glass sheet 100 can be acid-washed colored enamel glass. Acid-washed colored enamel tempered glass uses ultra-white float glass as raw material. The outer surface of the glass sheet 100 is treated by chemical acid washing and etching to prepare a glass raw material with a gloss of ≤12Gu, haze ≥88%, roughness Ra: 0.9~2μm, and light transmittance ≥87%, so that the glass surface produces a diffuse reflection effect and avoids light pollution. Furthermore, an ink of a set color can be selected and used to print on the inner surface to make the appearance of the glass sheet 100 have a preset color.
[0042] In addition, before laying the encapsulating film 200 and the battery cell 300, the surface of the colored glaze can be cleaned with a lint-free cloth soaked in anhydrous ethanol to remove surface oil and particulate impurities, ensuring reliable bonding of subsequent materials.
[0043] S200, The support frame 600 is fitted onto the outer periphery of the glass sheet 100; S300, sequentially lay the rear sealing film 400 and the back plate 500, and make the edges of the rear sealing film 400 and the edges of the back plate 500 overlap the support frame 600. To achieve better encapsulation, the dimensions of the rear encapsulation film 400 and the backplate 500 before lamination should be larger than the dimensions of the glass sheet 100, the front encapsulation film 200, and the solar cell 300. This ensures that the encapsulation film can flow fully during lamination and seal the edges of the photovoltaic glass, preventing external moisture from entering the interior of the photovoltaic glass through edge gaps and improving the sealing and protection performance and long-term weather resistance of the photovoltaic glass.
[0044] Because the laminating table of the laminator has a flat structure, uniform pressure is applied to each layer of the structure during the lamination process. It should be explained that the laminator applies uniform pressure to each layer of the structure by pressing down with airbags. If there is no support in the edge area, it will lead to uneven stress in the edge area, resulting in an excessive difference in thickness between the edge area and the middle area, which will affect the overall flatness and sealing performance of the photovoltaic glass.
[0045] In other words, if the excess edges of the back sealing film 400 and the backplate 500 lack a support structure, they will sag and collapse under lamination pressure. This will not only lead to uneven flow of the sealing film and missing sealant at the edges of the photovoltaic glass, but also easily cause wrinkles on the backplate 500 and poor adhesion between the film and the backplate 500. Therefore, a support frame 600 is needed to support them and prevent the edges of the back sealing film 400 and the backplate 500 from deforming under lamination pressure. This ensures the flatness of each layer during lamination and ensures that the sealing film flows evenly and fully fills the edges of the photovoltaic glass, achieving a good sealing effect.
[0046] Furthermore, the support frame 600 of this application is preferably made of metal material, and the support surface of the support frame 600 that abuts against the rear encapsulation film 400 is also provided with an anti-stick coating or anti-stick tape, which can effectively prevent the molten encapsulation film from sticking to the support frame 600, making it easy to remove the support frame 600 after lamination, while avoiding edge damage caused by film adhesion.
[0047] Understandably, the height of the support surface is not lower than the surface of the glass sheet 100 used to adhere to the front encapsulation film 200, so as to avoid losing the support function for the rear encapsulation film 400 and the edge of the backplate 500.
[0048] S400, perform lamination to connect the glass sheet 100, the front encapsulation film 200, the battery cell 300, the rear encapsulation film 400, and the backplate 500 into an integral structure; S500, remove the support frame 600, remove the excess rear sealing film 400 and backplate 500.
[0049] After the photovoltaic glass cools down, an additional inspection process can be added: the thickness of the photovoltaic glass at the edge and in the middle is measured with vernier calipers, and the thickness difference must be controlled within 0.5mm.
[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.
Claims
1. Photovoltaic power generation glass, characterized in that, It includes a glass sheet, a front encapsulating film, a battery cell, a rear encapsulating film, and a backplate arranged sequentially along the thickness direction of the photovoltaic glass. The front encapsulation film is made of POE material, or the front encapsulation film has a multi-layer structure, with at least one layer made of POE material; the rear encapsulation film is made of EVA material; the backsheet includes a substrate layer and a functional coating, the functional coating being applied at least to the side of the substrate layer facing the rear encapsulation film, and the functional coating being able to reflect light to the battery cell.
2. The photovoltaic power generation glass according to claim 1, characterized in that, The glass sheet includes an outer surface facing away from the front encapsulation film and an inner surface that is bonded to the front encapsulation film. The outer surface is surface treated by an acid pickling process.
3. The photovoltaic power generation glass according to claim 2, characterized in that, The inner surface is provided with a printing layer, which is configured to present a set color and / or a set pattern.
4. The photovoltaic power generation glass according to claim 1, characterized in that, The solar cell is a BC solar cell, which includes a first surface with grid lines and a second surface without grid lines, the second surface being disposed facing the glass sheet.
5. The photovoltaic power generation glass according to claim 1, characterized in that, The functional coating on the side facing the rear encapsulating film is a high-reflectivity coating, and the high-reflectivity coating has a reflectivity of not less than 65% in the 780nm to 1100nm wavelength band.
6. The manufacturing process of photovoltaic power generation glass, characterized in that, Includes the following steps: S100, Glass sheets, front-side encapsulating film and battery cells are laid sequentially on the support platform; S200, The support frame is fitted onto the outer periphery of the glass sheet; S300, Lay out the rear sealing film and the back plate in sequence, and make the edge of the rear sealing film and the edge of the back plate overlap the support frame; S400, perform lamination to connect the glass sheet, the front encapsulation film, the battery cell, the rear encapsulation film, and the backplate into an integral structure; S500: Remove the support frame and remove the excess rear sealing film and backplate.
7. The manufacturing process according to claim 6, characterized in that, The glass sheet includes an outer surface facing away from the front encapsulating film, and the preparation process of the glass sheet includes the following steps: The outer surface is treated by an acid pickling process.
8. The manufacturing process according to claim 6, characterized in that, The glass sheet includes an inner surface facing the front encapsulating film, and the preparation process of the glass sheet further includes the following steps: Select the ink color you want to use; The ink is used to print on the inner surface to give the glass sheet a predetermined color.
9. The manufacturing process according to claim 6, characterized in that, The support frame is made of metal and includes a support surface that abuts against the rear encapsulating film. At least the support surface is provided with an anti-stick coating or anti-stick tape.
10. The manufacturing process according to claim 9, characterized in that, The height of the support surface is not lower than the surface of the glass sheet used to adhere to the front encapsulation film.