Foldable portable double-sided semi-flexible photovoltaic module structure

Abstract

The utility model discloses a foldable portable double-sided semi-flexible photovoltaic module structure, belongs to the technical field of solar photovoltaic, and aims to solve the problems that a photovoltaic module is easy to be damaged by impact and is easy to warp due to poor impact resistance when the photovoltaic module is used, and the foldable portable double-sided semi-flexible photovoltaic module structure comprises a front film, and a front impact resistance layer is arranged above the front film; the top surface of the front anti-impact layer is connected with a second packaging film, the top surface of the second packaging film is connected with a battery layer, a rear anti-impact layer front piece is arranged above the battery layer, the top surface of the rear anti-impact layer front piece is connected with a fourth packaging film, the top surface of the fourth packaging film is connected with a rear anti-impact layer rear piece, and a rear film is arranged above the rear anti-impact layer rear piece; according to the utility model, the front shock-resistant layer, the rear shock-resistant layer front piece, the rear shock-resistant layer rear piece, the front film and the rear film are arranged, so that the mechanical shock-resistant protection capability of the photovoltaic cell is improved, and meanwhile, the photovoltaic module is not easy to warp and is more portable.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar photovoltaics, and in particular relates to a foldable and portable double-sided semi-flexible photovoltaic component structure. Background Art

[0002] The front cover of a traditional single-glass crystalline silicon solar photovoltaic module uses ultra-white tempered glass, which provides good protection for the photovoltaic cell 17 against mechanical impact and water vapor intrusion. However, its characteristics such as being unbendable, fragile, and heavy limit its application in certain scenarios, such as folding or portable photovoltaic charging. The application scenarios of such portable photovoltaic products require them to have the characteristics of high module conversion efficiency, portability, mechanical impact resistance, and low cost. In order to improve the conversion efficiency of the module and control costs, crystalline silicon cells such as PERC, IBC, HJT, TOPCon, etc. are used. In order to make such photovoltaic modules portable, the modules are usually required to be in a foldable form. In addition, according to the application scenarios of such products, most of the mechanical impact comes from the back of the product, so it is more effective to strengthen the impact-resistant layer on the back of the module. One solution involves using a thin fluoropolymer, such as polyvinylidene fluoride (PVDF) film, polyvinyl fluoride (PVF) film, or ethylene-tetrafluoroethylene copolymer (ETFE) film, as the front film of the module. Polyethylene terephthalate (PET) sheets placed in front of and / or behind the solar cells serve as the front and rear impact-resistant layers of the module. These sheets are then laminated together using encapsulation materials such as polyethylene vinyl acetate (EVA) and polyolefin elastomer (POE), as well as membrane materials such as polyvinylidene fluoride (PVDF) film, polyvinyl fluoride (PVF) film, and ethylene-tetrafluoroethylene copolymer (ETFE). Another solution involves using a flexible front sheet and a glass fiber reinforced resin sheet as support plates to provide the module with sufficient bending stiffness and mechanical impact resistance while maintaining a lightweight product. The support plates are typically made of glass fiber reinforced epoxy resin to provide the required mechanical impact resistance and bending stiffness. This type of structure reduces weight in photovoltaic products (the density of photovoltaic glass is approximately 2.5-2.7g / cm³, while the density of glass fiber-reinforced epoxy resin sheets, such as FR-4, is approximately 1.4g / cm³). This provides a certain degree of rigidity and mechanical impact resistance for crystalline silicon photovoltaic cell products. However, FR-4 sheets are relatively expensive, inflexible, and generally opaque (thus failing to achieve the approximately 5% to 25% power gain of bifacial cells), thus limiting their application in these products.

[0003] Existing photovoltaic modules have poor impact resistance during use, making them susceptible to damage from impact and warping.

[0004] Therefore, a foldable and portable double-sided semi-flexible photovoltaic module structure is needed to solve the problem that photovoltaic modules in the prior art have poor impact resistance during use, causing the photovoltaic modules to be easily damaged by impact and prone to warping. Utility Model Content

[0005] The purpose of the present invention is to provide a foldable and portable double-sided semi-flexible photovoltaic module structure to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a foldable and portable double-sided semi-flexible photovoltaic module structure, comprising a front film, a front anti-impact layer is arranged above the front film, the top surface of the front anti-impact layer is connected to a second packaging film, the top surface of the second packaging film is connected to a battery layer, a rear anti-impact layer front sheet is arranged above the battery layer, the top surface of the rear anti-impact layer front sheet is connected to a fourth packaging film, the top surface of the fourth packaging film is connected to a rear anti-impact layer back sheet, and a rear film is arranged above the rear anti-impact layer back sheet.

[0007] It should be noted that the top surface of the front film is connected to the first packaging film, the top surface of the first packaging film is connected to the first covering layer, and the top surface of the first covering layer is connected to the bottom surface of the front impact-resistant layer.

[0008] It is further worth mentioning that the battery layer includes a busbar, a braided copper strip and photovoltaic cells.

[0009] It should be further explained that the top surface of the battery layer is connected to a third packaging film, and the top surface of the third packaging film is connected to the bottom surface of the front sheet of the rear impact-resistant layer.

[0010] As a preferred embodiment, the top surface of the rear impact-resistant layer is connected to a second covering layer, the top surface of the second covering layer is connected to a fifth packaging film, and the top surface of the fifth packaging film is connected to the bottom surface of the rear film.

[0011] As a preferred embodiment, a junction box is connected to one side of the top surface of the rear membrane.

[0012] Compared with the prior art, the foldable and portable double-sided semi-flexible photovoltaic module structure provided by the present invention has at least the following beneficial effects:

[0013] (1) By setting the front impact-resistant layer, the front sheet of the rear impact-resistant layer, the rear sheet of the rear impact-resistant layer, the front film and the rear mold, the mechanical impact protection capability of the photovoltaic cell is improved, and the photovoltaic module is not easy to warp and is more lightweight.

[0014] (2) By setting up the photovoltaic cells, front film, back film, first covering layer and second covering layer, the photovoltaic module can generate electricity on both sides, thereby increasing the unit area of the product and making the power generation efficiency higher.

[0015] (3) By selecting materials for the front film, the first packaging film, the first covering layer, the front impact-resistant layer, the second packaging film, the third packaging film, the front sheet of the rear impact-resistant layer, the fourth packaging film, the rear sheet of the rear impact-resistant layer, the second covering layer, the fifth packaging film and the rear mold, the production cost of the photovoltaic module can be reduced.

[0016] (4) By providing the first packaging film, the second packaging film, the third packaging film, the fourth packaging film and the fifth packaging film, the entire photovoltaic module can be easily folded, thereby improving the portability of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the interlayer structure of the utility model before overall lamination;

[0018] Figure 2 It is a schematic diagram of the overall planar structure of the utility model.

[0019] In the picture:

[0020] 1. Front film; 2. First packaging film; 3. First covering layer; 4. Front impact-resistant layer; 5. Second packaging film; 6. Battery layer; 7. Third packaging film; 8. Front sheet of rear impact-resistant layer; 9. Fourth packaging film; 10. Rear sheet of rear impact-resistant layer; 11. Second covering layer; 12. Fifth packaging film; 13. Rear film; 14. Junction box; 15. Busbar; 16. Braided copper tape; 17. Photovoltaic cell. DETAILED DESCRIPTION

[0021] See also Figure 1-Figure 2 The utility model provides a foldable and portable double-sided semi-flexible photovoltaic module structure, including a front film 1, a front anti-impact layer 4 is arranged above the front film 1, the top surface of the front anti-impact layer 4 is connected to a second packaging film 5, the top surface of the second packaging film 5 is connected to a battery layer 6, a rear anti-impact layer front sheet 8 is arranged above the battery layer 6, the top surface of the rear anti-impact layer front sheet 8 is connected to a fourth packaging film 9, the top surface of the fourth packaging film 9 is connected to a rear anti-impact layer back sheet 10, and a rear film 13 is arranged above the rear anti-impact layer back sheet 10.

[0022] The front film 1 is a fluoropolymer film, such as a polyvinylidene fluoride (PVDF) film, an ethylene-tetrafluoroethylene copolymer (ETFE) film, an ethylene-chlorotrifluoroethylene copolymer (ECTFE) film, a polyvinyl fluoride (PVF) film, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) film, a tetrafluoroethylene-hexafluoropropylene copolymer (FEP) film, and a polychlorotrifluoroethylene (PCTFE) film. A tetrafluoroethylene-hexafluoroethylene-vinylidene fluoride copolymer (THV) film is preferred.

[0023] The front impact-resistant layer 4 is made of a material with an elastic modulus of 2 to 10 GPa, preferably a weather-resistant biaxially oriented polyethylene terephthalate (BOPET) substrate with an elastic modulus of about 9 GPa and a thickness of about 270 μm, and is surface-coated or surface-treated to improve the bonding strength with the second packaging film 5.

[0024] The second packaging film 5 is a thermoplastic or thermosetting polymer elastomer film layer with an elastic modulus between 30 and 70 MPa and a glass transition temperature between -60°C and -30°C, preferably thermoplastic polyolefin (TPO), with an elastic modulus of approximately 30 MPa and a thickness of approximately 0.5 mm; polyethylene vinyl acetate (EVA), polyolefin elastomer (POE), etc. may be selected.

[0025] The rear impact-resistant front sheet 8 is made of a material with an elastic modulus of 2 to 10 GPa, preferably a weather-resistant biaxially oriented polyethylene terephthalate (BOPET) substrate, an elastic modulus of approximately 4 GPa, a thickness of approximately 270 μm, and a surface coating or surface treatment to improve the bonding strength with the fourth packaging film 9.

[0026] The fourth packaging film 9 is a thermoplastic polymer elastomer film layer with an elastic modulus between 250 and 280 MPa and a glass transition temperature between -100°C and +50°C, preferably an ionomer (such as SGP), with an elastic modulus of about 280 MPa and a thickness of about 0.6 mm; thermoplastic silicone elastomer (TPSE) can be selected.

[0027] The rear film 13 is preferably a tetrafluoroethylene-hexafluoroethylene-vinylidene fluoride copolymer (THV) film. Fluoropolymer films such as polyvinylidene fluoride (PVDF) film, ethylene-tetrafluoroethylene copolymer (ETFE) film, ethylene-chlorotrifluoroethylene copolymer (ECTFE) film, polyvinyl fluoride (PVF) film, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) film, tetrafluoroethylene-hexafluoropropylene copolymer (FEP) film, and polychlorotrifluoroethylene (PCTFE) film can be selected.

[0028] Furthermore, the top surface of the front film 1 is connected to the first packaging film 2 , the top surface of the first packaging film 2 is connected to the first covering layer 3 , and the top surface of the first covering layer 3 is connected to the bottom surface of the front anti-impact layer 4 .

[0029] The first packaging film 2 is provided to improve the sealing between the front film 1 and the first covering layer 3 , thereby improving the connection stability between the front film 1 and the front impact-resistant layer 4 .

[0030] The first packaging film 2 is a thermoplastic or thermosetting polymer elastomer film layer with an elastic modulus between 30 and 70 MPa and a glass transition temperature between -60°C and -30°C, preferably thermoplastic polyolefin (TPO), with an elastic modulus of about 30 MPa and a thickness of about 0.5 mm; polyethylene vinyl acetate (EVA), polyolefin elastomer (POE), etc. may be selected.

[0031] Furthermore, the battery layer 6 includes a busbar 15 , a braided copper tape 16 and photovoltaic cells 17 .

[0032] By providing the battery layer 6, the entire photovoltaic assembly is able to generate photovoltaic power.

[0033] The cell layer 6 is a circuit system formed by welding bus ribbons 15 , braided copper ribbons 16 and photovoltaic cells 17 .

[0034] Photovoltaic cells 17 include but are not limited to PERC, IBC, TOPCON, HJT and other cell technology products.

[0035] Furthermore, the top surface of the battery layer 6 is connected to a third packaging film 7 , and the top surface of the third packaging film 7 is connected to the bottom surface of the rear impact-resistant layer front sheet 8 .

[0036] The third packaging film 7 is provided to improve the sealing performance between the battery layer 6 and the rear impact-resistant layer front sheet 8, thereby improving the stability of the connection between the battery layer 6 and the rear impact-resistant layer front sheet 8.

[0037] The third packaging film 7 is a thermoplastic or thermosetting polymer elastomer film layer with an elastic modulus between 30 and 70 MPa and a glass transition temperature between -60°C and -30°C, preferably polyethylene vinyl acetate (EVA), with an elastic modulus of approximately 65 MPa and a thickness of approximately 0.25 mm; thermoplastic polyolefin (TPO), polyolefin elastomer (POE), etc. may be selected.

[0038] Furthermore, the top surface of the rear impact-resistant layer back sheet 10 is connected to the second covering layer 11 , the top surface of the second covering layer 11 is connected to the fifth packaging film 12 , and the top surface of the fifth packaging film 12 is connected to the bottom surface of the rear film 13 .

[0039] The fifth packaging film 12 is provided to improve the connection stability between the back film 13 and the second covering layer 11 .

[0040] The fifth packaging film 12 is a thermoplastic or thermosetting polymer elastomer film layer with an elastic modulus between 30 and 70 MPa and a glass transition temperature between -60°C and -30°C, preferably thermoplastic polyolefin (TPO), with an elastic modulus of approximately 30 MPa and a thickness of approximately 0.5 mm; polyethylene vinyl acetate (EVA), polyolefin elastomer (POE), etc. may be selected.

[0041] Furthermore, a junction box 14 is connected to one side of the top surface of the rear membrane 13 .

[0042] By providing the junction box 14 , the electric energy generated by the photovoltaic assembly can be transmitted to the corresponding location through the connecting wires on the junction box 14 .

[0043] The second covering layer 11 is made of black EVA with an elastic modulus of about 65 MPa and a thickness of 0.45 mm, and is used to cover the busbar 15 and the braided copper strip 16 .

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A foldable and portable double-sided semi-flexible photovoltaic module structure, comprising a front film (1), characterized in that: A front impact-resistant layer (4) is arranged above the front film (1); a second packaging film (5) is connected to the top surface of the front impact-resistant layer (4); a battery layer (6) is connected to the top surface of the second packaging film (5); a rear impact-resistant layer front sheet (8) is arranged above the battery layer (6); a fourth packaging film (9) is connected to the top surface of the rear impact-resistant layer front sheet (8); a rear impact-resistant layer back sheet (10) is connected to the top surface of the fourth packaging film (9); a rear film (13) is arranged above the rear impact-resistant layer back sheet (10).

2. The foldable and portable double-sided semi-flexible photovoltaic module structure according to claim 1, characterized in that: The top surface of the front film (1) is connected to a first packaging film (2), the top surface of the first packaging film (2) is connected to a first covering layer (3), and the top surface of the first covering layer (3) is connected to the bottom surface of the front impact-resistant layer (4).

3. The foldable and portable double-sided semi-flexible photovoltaic module structure according to claim 1, characterized in that: The battery layer (6) comprises a busbar (15), a braided copper strip (16) and a photovoltaic cell (17).

4. The foldable and portable double-sided semi-flexible photovoltaic module structure according to claim 1, characterized in that: The top surface of the battery layer (6) is connected to a third packaging film (7), and the top surface of the third packaging film (7) is connected to the bottom surface of the rear impact-resistant layer front sheet (8).

5. The foldable and portable double-sided semi-flexible photovoltaic module structure according to claim 1, characterized in that: The top surface of the rear impact-resistant layer rear sheet (10) is connected to a second covering layer (11), the top surface of the second covering layer (11) is connected to a fifth packaging film (12), and the top surface of the fifth packaging film (12) is connected to the bottom surface of the rear film (13).

6. The foldable and portable double-sided semi-flexible photovoltaic module structure according to claim 1, characterized in that: One side of the top surface of the rear membrane (13) is connected to a junction box (14).

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