Multilayer composite reflective film capable of improving conversion efficiency

Abstract

The utility model relates to the field of photovoltaic technology, in particular to a multilayer composite reflective film capable of improving conversion efficiency, which comprises a reflective layer, a glass bead layer used for increasing utilization rate is arranged above the reflective layer, and a UV (ultraviolet) absorbing layer used for absorbing ultraviolet rays is adhered above the glass bead layer. A plurality of hollow transparent glass beads are arranged in the glass bead layer; the reflective layer comprises an insulating layer and a reflective tape which is arranged below the insulating layer and is of a V-shaped structure. According to the utility model, the glass bead layer capable of improving the light reflectivity is additionally arranged at the top of the reflective layer, so that the quantity of light rays reflected out of the photovoltaic glass can be further reduced, the energy loss caused by light ray deviation is reduced, and the solar energy utilization rate under different solar incident angles is improved; a triangular prism structure is formed between the glass beads and the PET base material layer and is matched with the glass bead layer, so that ultraviolet rays are fully reflected.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a multi-layer composite reflective film with improved conversion efficiency. Background Art

[0002] Solar module composite reflective film is a thin film material with high reflectivity, usually composed of multiple materials and used in solar energy systems to improve the efficiency and performance of solar energy utilization. It can effectively reflect the energy of sunlight back to the collector tube or solar panel, thereby increasing the absorption and utilization efficiency of light energy.

[0003] In order to increase the conversion efficiency of the reflective film, a reflective strip with a triangular prism structure is applied to the surface to improve the utilization rate of sunlight. However, this reflective strip has a simple structure, low efficiency, and a limited reflected light area. Part of the light is reflected outside the photovoltaic cell and cannot be fully utilized. It is difficult to obtain the maximum conversion efficiency under different angles of sunlight.

[0004] The existing public technical solution, with announcement number CN209150134U, discloses a reflective film for improving photovoltaic conversion efficiency, including a substrate layer, an adhesive layer, a microprism layer, and a reflective layer. By arranging a number of triangular prisms of different shapes and sizes in parallel in a random and disordered manner, the compression and lodging resistance of the entire reflective film can be effectively enhanced, which not only makes the photovoltaic modules suitable for areas with different lighting directions, but also reduces the amount of light reflected outside the photovoltaic glass, reduces the energy loss caused by light deviation, and improves the utilization rate of solar energy under different solar incidence angles.

[0005] Although this disordered arrangement of triangular prisms can increase the utilization rate of solar energy, in actual processing, the microprism slurry is generally applied by spraying, rolling, etc., and the disordered microprism structure means that the coating time and coating method need to be repeatedly controlled to adjust the shape and size of the microprism, which reduces the processing time and is more troublesome to produce. Summary of the invention

[0006] The purpose of the utility model is to provide a multi-layer composite reflective film with improved conversion efficiency, which can replace the disordered micro-prism structure with a reflective tape and cooperate with the glass bead layer, and can ensure the utilization rate of solar energy while being simple and quick to process, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the utility model provides the following technical solutions: a multi-layer composite reflective film with improved conversion efficiency, comprising a reflective layer, a glass bead layer for increasing utilization rate is arranged above the reflective layer, and a UV absorption layer for absorbing ultraviolet rays is pasted above the glass bead layer, and a plurality of hollow transparent glass beads are arranged in the glass bead layer;

[0008] The reflective layer comprises an insulating layer and a reflective tape in a V-shaped structure arranged below the insulating layer. The top surface and the bottom surface of the reflective tape are coated with a corrosion-resistant coating for preventing corrosion.

[0009] Preferably, a PET substrate layer is disposed below the reflective layer.

[0010] Preferably, an EVA film is disposed below the PET substrate layer.

[0011] Preferably, a POE layer is disposed below the EVA film and is symmetrically distributed bilaterally.

[0012] Preferably, the PET substrate layer, the EVA film and the POE layer are all made of transparent materials.

[0013] Preferably, the reflective tape is made of metal aluminum.

[0014] Preferably, the surface of the UV absorbing layer is evenly coated with light conversion powder capable of absorbing ultraviolet rays.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. By adding a glass bead layer on top of the reflective layer to improve the light reflectivity, the amount of light reflected outside the photovoltaic glass can be further reduced, thereby reducing the energy loss caused by light deviation and improving the utilization rate of solar energy under different solar incident angles. In addition, since the reflective tape in the reflective layer is a V-shaped structure, it forms a triangular prism structure between the PET substrate layer and cooperates with the glass bead layer to fully reflect ultraviolet rays. The reflective tape replaces the disordered micro-prism structure, and there is no need to repeatedly adjust the shape and size of the micro-prism by adjusting the coating time and coating method. The utilization rate of solar energy can be guaranteed while the processing is simple and fast.

[0017] 2. Adding a corrosion-resistant coating on the reflective tape can improve the corrosion resistance of the reflective film, and adding a POE layer at the bottom of the EVA film to form a POE film bottom layer, combining the characteristics of the POE film and the EVA film to improve the chemical properties of the reflective film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1This is the overall structural view of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the insulating layer of the utility model;

[0021] Figure 3 This is a structural view of the reflective tape of the utility model;

[0022] Figure 4 For the utility model Figure 1 A is an enlarged view of the middle image.

[0023] Description of reference numerals:

[0024] 1. UV absorption layer; 2. Glass bead layer; 3. Reflective layer; 301. Insulation layer; 302. Reflective tape; 303. Corrosion-resistant coating; 4. PET substrate layer; 5. EVA film; 6. POE layer. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The utility model provides a technical solution:

[0027] See also Figures 1 to 3 A multi-layer composite reflective film with improved conversion efficiency comprises a reflective layer 3, a glass bead layer 2 for increasing utilization rate is arranged above the reflective layer 3, and a UV absorption layer 1 for absorbing ultraviolet rays is pasted above the glass bead layer 2, and a plurality of hollow transparent glass beads are arranged in the glass bead layer 2; the reflective layer 3 comprises an insulating layer 301, and a reflective tape 302 in a V-shaped structure arranged below the insulating layer 301, the top and bottom surfaces of the reflective tape 302 are coated with a corrosion-resistant coating 303 for corrosion prevention, the reflective tape 302 is made of metal aluminum, and the surface of the UV absorption layer 1 is evenly coated with a light-converting powder that can absorb ultraviolet rays.

[0028] By adopting the above technical scheme, the upper and lower sides of the reflective tape 302 with a V-shaped structure are coated with a corrosion-resistant coating 303, and an insulating layer 301 that fits the shape of the reflective tape 302 is arranged above the reflective tape 302 to protect the internal aluminum reflective tape 302, and a glass bead layer 2 made of hollow transparent glass beads is arranged above the reflective layer 3, and a UV absorption layer 1 containing light-converting powder is arranged on the top of the glass bead layer 2. The light-converting powder converts and absorbs ultraviolet rays and reflects them through the glass bead layer 2. When passing through the glass beads in the glass bead layer 2, it can be fully reflected, and a part of the light that is not reflected can be reflected again through the reflective tape 302, thereby reducing the amount of light reflected outside the photovoltaic glass, thereby reducing the energy loss caused by light deviation, and improving the utilization rate of solar energy under different solar incidence angles.

[0029] Specifically, Figure 4 As shown, a PET substrate layer 4 is arranged below the reflective layer 3, an EVA film 5 is arranged below the PET substrate layer 4, and a POE layer 6 symmetrically distributed on the left and right is arranged below the EVA film 5. The PET substrate layer 4, the EVA film 5 and the POE layer 6 are all made of transparent materials.

[0030] By adopting the above technical solution, the reflective layer 3 adopts the PET substrate layer 4 commonly used in the industry, and a transparent EVA film 5 and a POE layer 6 are arranged on the top of the PET substrate layer 4, and the POE layer 6 is distributed on both sides of the bottom of the EVA film 5, which can improve the chemical properties of the reflective layer 3.

[0031] Working principle: When ultraviolet rays pass through the UV absorption layer 1, they are converted and absorbed by the light-converting powder and reflected by the glass bead layer 2. When passing through the glass beads in the glass bead layer 2, they can be fully reflected, and a part of the light that is not reflected can be reflected again by the reflective tape 302, thereby reducing the amount of light reflected outside the photovoltaic glass, thereby reducing the energy loss caused by light deviation and improving the utilization rate of solar energy under different solar incidence angles.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A multi-layer composite reflective film with improved conversion efficiency, comprising a reflective layer (3), characterized in that: A glass microbead layer (2) for increasing utilization is arranged above the reflective layer (3), and a UV absorption layer (1) for absorbing ultraviolet rays is pasted above the glass microbead layer (2), and a plurality of hollow transparent glass microbeads are arranged in the glass microbead layer (2); The reflective layer (3) comprises an insulating layer (301) and a reflective tape (302) in a V-shaped structure arranged below the insulating layer (301), and the top and bottom surfaces of the reflective tape (302) are coated with a corrosion-resistant coating (303) for preventing corrosion.

2. The multi-layer composite reflective film with improved conversion efficiency according to claim 1, characterized in that: A PET substrate layer (4) is arranged below the reflective layer (3).

3. The multi-layer composite reflective film with improved conversion efficiency according to claim 2, characterized in that: An EVA film (5) is arranged below the PET substrate layer (4).

4. The multi-layer composite reflective film with improved conversion efficiency according to claim 3, characterized in that: A POE layer (6) is arranged below the EVA film (5) and is symmetrically distributed on the left and right.

5. The multi-layer composite reflective film with improved conversion efficiency according to claim 4, characterized in that: The PET substrate layer (4), the EVA film (5) and the POE layer (6) are all made of transparent materials.

6. The multi-layer composite reflective film with improved conversion efficiency according to claim 1, characterized in that: The reflective tape (302) is made of metal aluminum.

7. The multi-layer composite reflective film with improved conversion efficiency according to claim 1, characterized in that: The surface of the UV absorption layer (1) is evenly coated with light conversion powder capable of absorbing ultraviolet rays.

Images