Lightweight photovoltaic module

Abstract

The application discloses a light-weight photovoltaic module, and relates to the technical field of photovoltaic modules, which comprises a light-weight frame and a solar cell panel arranged in the light-weight frame, wherein the solar cell panel comprises solar cell pieces, the upper surface of the solar cell pieces is bonded with an upper encapsulating adhesive film, the lower surface of the solar cell pieces is bonded with a lower encapsulating adhesive film, the side of the upper encapsulating adhesive film, which is away from the solar cell pieces, is bonded with a transparent panel layer, and the side of the lower encapsulating adhesive film, which is away from the solar cell pieces, is bonded with a back plate layer; the waterproof effect of the photovoltaic module can be enhanced on the basis of improving the light weight through cooperation of the above structure.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic module technology, specifically a lightweight photovoltaic module. Background Technology

[0002] Over the past decade, photovoltaic (PV) power generation has become one of the world's most popular renewable and clean energy sources, and the PV industry has experienced exponential growth. Throughout the development of the PV field, PV modules, as one of the key materials and equipment in the entire PV system, have also undergone numerous iterations and updates.

[0003] Photovoltaic modules are used in a wide range of applications, but in some scenarios, such as lightweight roofs, traditional photovoltaic modules cannot be used due to load-bearing limitations. Therefore, with the development of encapsulation materials and technologies, modules are also trending towards lighter weight to adapt to more roofing scenarios and application environments.

[0004] The utility model with announcement number CN222509219U discloses a lightweight photovoltaic module, including a lightweight frame module, a transparent cover plate, a front encapsulation film, a cell layer, a back encapsulation film that cooperates with the front encapsulation film to encapsulate the cell layer, and a back sheet. It also includes a waterproof coating applied to the periphery of the encapsulated cell layer, a flexible waterproof layer disposed outside the waterproof coating to wrap the cell layer, and a waterproof support frame disposed between the flexible waterproof layer and the lightweight frame module.

[0005] In the process of developing this application, the following problems were discovered with this technology: The backsheet is the core barrier against the intrusion of environmental moisture. If the waterproofing fails, moisture can penetrate through the backsheet into the interior, causing the EVA film to hydrolyze and generate acetic acid, which accelerates the electrochemical corrosion of metal components such as solar cells and solder ribbons. The acetic acid environment reduces the light transmittance and conductivity of transparent conductive oxides, resulting in an average annual power degradation rate of the module. Although the above-mentioned documents suggest that the backsheet's support and waterproofing effect can be enhanced by adding a second honeycomb aluminum plate and a sealing plate at the bottom of the backsheet to ensure sealing, the aluminum plate and sealing plate also increase the weight of the entire photovoltaic module, making the overall photovoltaic module less lightweight.

[0006] Therefore, we propose a lightweight photovoltaic module. Utility Model Content

[0007] The purpose of this utility model is to provide a lightweight photovoltaic module in order to enhance the waterproof effect of the photovoltaic module while improving its lightweight design.

[0008] The technical solution adopted in this utility model is as follows: A lightweight photovoltaic module includes a lightweight frame and a solar panel disposed inside the lightweight frame. The solar panel includes solar cells, an upper encapsulating film is adhered to the upper surface of the solar cells, a lower encapsulating film is adhered to the lower surface of the solar cells, a transparent panel layer is adhered to the side of the upper encapsulating film away from the solar cells, and a backsheet layer is adhered to the side of the lower encapsulating film away from the solar cells. The backsheet layer includes a fluorinated resin coating. The upper surface of the fluorinated resin coating is bonded to the lower surface of the lower encapsulating film. A polyethylene terephthalate layer is bonded to the lower surface of the fluorinated resin coating. A liquid crystal aromatic polyester polymer layer is bonded to the side of the polyethylene terephthalate layer away from the fluorinated resin coating. A polyvinylidene fluoride film layer is bonded to the side of the liquid crystal aromatic polyester polymer layer away from the polyethylene terephthalate layer.

[0009] Furthermore, butyl sealant is bonded between the inner wall of the lightweight frame and the outer side of the solar panel.

[0010] Furthermore, the upper encapsulation film and the lower encapsulation film are POE films.

[0011] Furthermore, an anti-hydrolysis adhesive is bonded between the polyethylene terephthalate layer and the liquid crystal aromatic polyester polymer layer.

[0012] Furthermore, an anti-hydrolysis adhesive is bonded between the liquid crystal aromatic polyester polymer layer and the polyvinylidene fluoride film layer.

[0013] Furthermore, the transparent panel layer is a tempered glass layer.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: In this invention, in the backsheet layer of the photovoltaic module, the polyvinylidene fluoride (PVDF) film layer has tightly arranged molecular chains and a high fluorine content, forming a physical barrier to block water molecule diffusion. Simultaneously, the flexible PVDF film layer can compensate for thermal expansion and contraction stress, preventing moisture intrusion paths caused by delamination or tearing. Furthermore, the liquid crystal aromatic polyester polymer layer has a highly ordered molecular chain arrangement with extremely small intermolecular gaps, also forming a physical barrier to block water molecule penetration. Its main chain contains a rigid aromatic ring structure, reducing the free movement of molecular chains and further inhibiting water vapor diffusion paths, thereby improving the waterproof effect. The polyethylene terephthalate (PET) layer, formed through a biaxial stretching process, has a highly ordered molecular chain arrangement with extremely small intermolecular gaps, directly blocking water molecule penetration, thus improving the waterproof effect of the backsheet layer and consequently improving the waterproof effect of the solar panel. Through the combined design of the PVDF film layer, liquid crystal aromatic polyester polymer layer, and PET layer, a multi-layered synergistic waterproof barrier is formed, enhancing the waterproof effect of the photovoltaic module while improving its lightweight properties. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the backplate layer in this utility model.

[0016] The markings in the diagram are: 1-Lightweight frame, 2-Solar panel, 21-Solar cell, 22-Upper encapsulation film, 23-Lower encapsulation film, 24-Transparent panel layer, 25-Backsheet layer, 251-Fluoropolymer coating, 252-Polyethylene terephthalate layer, 253-Liquid crystal aromatic polyester polymer layer, 254-Polyvinylidene fluoride film layer. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Example

[0018] Reference Figures 1-3A lightweight photovoltaic module includes a lightweight frame 1 and a solar panel 2 disposed inside the lightweight frame 1. The solar panel 2 includes solar cells 21, an upper encapsulating film 22 is adhered to the upper surface of the solar cells 21, a lower encapsulating film 23 is adhered to the lower surface of the solar cells 21, a transparent panel layer 24 (tempered glass) is adhered to the side of the upper encapsulating film 22 away from the solar cells 21, and a backsheet layer is adhered to the side of the lower encapsulating film 23 away from the solar cells 21. 25; The backsheet layer 25 includes a fluorinated resin coating 251, the upper surface of which is bonded to the lower surface of the lower encapsulating film 23. A polyethylene terephthalate layer 252 is bonded to the lower surface of the fluorinated resin coating 251. A liquid crystal aromatic polyester polymer layer 253 is bonded to the side of the polyethylene terephthalate layer 252 away from the fluorinated resin coating 251. A polyvinylidene fluoride film layer 254 is bonded to the side of the liquid crystal aromatic polyester polymer layer 253 away from the polyethylene terephthalate layer 252. Specifically, in this photovoltaic... In the backsheet layer 25 of the module, the polyvinylidene fluoride (PVDF) film layer 254 has tightly packed molecular chains and a high fluorine content, which can form a physical barrier to block water molecule diffusion. Simultaneously, the flexible PVDF film layer 254 can compensate for thermal expansion and contraction stress, preventing moisture intrusion paths caused by delamination or tearing. Furthermore, the liquid crystal aromatic polyester polymer layer 253 has a highly ordered molecular chain arrangement with extremely small intermolecular gaps, which can also form a physical barrier to block water molecule penetration. Its main chain contains a rigid aromatic ring structure, reducing the free movement of molecular chains and further inhibiting water vapor diffusion paths, thereby improving… High waterproof performance; the polyethylene terephthalate layer 252 is formed by biaxial stretching to create a highly ordered molecular chain arrangement with extremely small intermolecular gaps, which can directly block water molecule penetration, thereby improving the waterproof performance of the backsheet layer 25 and thus improving the waterproof performance of the solar panel 2; through the combination of the above structures and the composite design of the polyvinylidene fluoride film layer 254, the liquid crystal aromatic polyester polymer layer 253 and the polyethylene terephthalate layer 252, a multi-layer synergistic waterproof barrier is formed, which enhances the waterproof performance of the photovoltaic module while improving lightweight.

[0019] Reference Figures 1-3A butyl sealant is bonded between the inner wall of the lightweight frame 1 and the outer side of the solar panel 2. The upper encapsulation film 22 and the lower encapsulation film 23 are POE films. Specifically, the butyl sealant bonded between the lightweight frame 1 and the solar panel 2 uses butyl rubber as the base material. Its molecular backbone is polymerized from isobutylene and a small amount of isoprene. The molecular chains are tightly arranged and highly saturated, physically blocking the diffusion paths of gas and water vapor, forming a natural waterproof barrier, thereby improving the bonding strength between the lightweight frame 1 and the solar panel 2. Waterproofing; a hydrolytically resistant adhesive is used to bond the polyethylene terephthalate layer 252 and the liquid crystal aromatic polyester polymer layer 253, and a hydrolytically resistant adhesive is used to bond the liquid crystal aromatic polyester polymer layer 253 and the polyvinylidene fluoride film layer 254; specifically, the adhesive used to bond the polyethylene terephthalate layer 252, the liquid crystal aromatic polyester polymer layer 253 and the polyvinylidene fluoride film layer 254 must have high bonding strength and hydrolytic stability to ensure that the bonding strength and insulation performance can still be maintained in a humid and hot environment.

[0020] The implementation principle of a lightweight photovoltaic module embodiment of this application is as follows: In the backsheet layer 25 of this photovoltaic module, the polyvinylidene fluoride (PVDF) film layer 254 has tightly packed molecular chains and a high fluorine content, forming a physical barrier to block water molecule diffusion. Simultaneously, the flexible PVDF film layer 254 can compensate for thermal expansion and contraction stress, preventing moisture intrusion paths caused by delamination or tearing. Furthermore, the liquid crystal aromatic polyester polymer layer 253 has a highly ordered molecular chain arrangement with extremely small intermolecular gaps, also forming a physical barrier to block water molecule penetration. Its main chain contains a rigid aromatic ring structure, reducing the free movement of molecular chains and further inhibiting water vapor diffusion paths. Furthermore, the waterproofing effect is improved. The polyethylene terephthalate layer 252 is formed by biaxial stretching to create a highly ordered molecular chain arrangement with extremely small intermolecular gaps, which can directly block water molecule penetration, thereby improving the waterproofing effect of the backsheet layer 25 and thus the waterproofing effect of the solar panel 2. Through the combination of the above structures, the composite design of the polyvinylidene fluoride film layer 254, the liquid crystal aromatic polyester polymer layer 253, and the polyethylene terephthalate layer 252 forms a multi-layer synergistic waterproof barrier, enhancing the waterproofing effect of the photovoltaic module while improving its lightweight properties.

[0021] On the other hand, the adhesive used to bond the polyethylene terephthalate layer 252, the liquid crystal aromatic polyester polymer layer 253, and the polyvinylidene fluoride film layer 254 must have high bonding strength and hydrolytic stability to ensure that the bonding strength and insulation performance can be maintained in a humid and hot environment. The butyl sealant used to bond the lightweight frame 1 and the solar panel 2 is based on butyl rubber. Its molecular backbone is polymerized from isobutylene and a small amount of isoprene. The molecular chains are tightly arranged and highly saturated. The diffusion paths of gas and water vapor are physically blocked, which can form a natural waterproof barrier, thereby improving the waterproofness between the lightweight frame 1 and the solar panel 2.

[0022] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lightweight photovoltaic module, comprising a lightweight frame (1) and a solar panel (2) disposed inside the lightweight frame (1), characterized in that: The solar panel (2) includes a solar cell (21), an upper encapsulation film (22) is bonded to the upper surface of the solar cell (21), a lower encapsulation film (23) is bonded to the lower surface of the solar cell (21), a transparent panel layer (24) is bonded to the side of the upper encapsulation film (22) away from the solar cell (21), and a backsheet layer (25) is bonded to the side of the lower encapsulation film (23) away from the solar cell (21). The backsheet layer (25) includes a fluorinated resin coating (251), the upper surface of which is bonded to the lower surface of the lower encapsulation film (23), a polyethylene terephthalate layer (252) is bonded to the lower surface of the fluorinated resin coating (251), a liquid crystal aromatic polyester polymer layer (253) is bonded to the side of the polyethylene terephthalate layer (252) away from the fluorinated resin coating (251), and a polyvinylidene fluoride film layer (254) is bonded to the side of the liquid crystal aromatic polyester polymer layer (253) away from the polyethylene terephthalate layer (252).

2. A lightweight photovoltaic module as described in claim 1, characterized in that: Butyl sealant is bonded between the inner wall of the lightweight frame (1) and the outer side of the solar panel (2).

3. A lightweight photovoltaic module as described in claim 1, characterized in that: The upper encapsulation film (22) and the lower encapsulation film (23) are POE films.

4. A lightweight photovoltaic module as described in claim 1, characterized in that: An anti-hydrolysis adhesive is bonded between the polyethylene terephthalate layer (252) and the liquid crystal aromatic polyester polymer layer (253).

5. A lightweight photovoltaic module as described in claim 1, characterized in that: An anti-hydrolysis adhesive is bonded between the liquid crystal aromatic polyester polymer layer (253) and the polyvinylidene fluoride film layer (254).

6. A lightweight photovoltaic module as described in claim 1, characterized in that: The transparent panel layer (24) is a tempered glass layer.

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