Photovoltaic adhesive film with light conversion function

Abstract

The utility model relates to the field of photovoltaic adhesive films, in particular to a photovoltaic adhesive film with a light conversion function. The polyester protection layer is arranged on the photovoltaic adhesive film, the anti-reflection layer is arranged below the polyester protection layer, the blocking layer is arranged below the anti-reflection layer, the light conversion layer is arranged below the blocking layer, the bonding layer is arranged below the light conversion layer, and the layers of films are laminated into a whole. The light conversion layer adopts an EPE adhesive film, the EPE adhesive film is formed by laminating a plurality of layers of adhesive films, the middle layer of the EPE adhesive film is a POE adhesive film, copper indium sulfide particles are arranged in the POE adhesive film, the copper indium sulfide particles can convert long-wave ultraviolet rays of 280-500 nanometers into visible light of 500-800 nanometers, and the outer layer of the copper indium sulfide particles is wrapped with a silicon oxide shell. According to the photovoltaic adhesive film, the light conversion efficiency is improved, meanwhile, the polyester protection layer and the bonding layer protect the photovoltaic adhesive film bidirectionally, and the service life of the photovoltaic adhesive film is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic adhesive films, in particular to a photovoltaic adhesive film with a light conversion function. Background Art

[0002] Photovoltaic film with light conversion function is a special material that can achieve effective conversion of light energy. This film plays a key role in photovoltaic modules, converting sunlight into usable electrical energy. Its light conversion function mainly depends on specific photoconverters, which can absorb specific wavelengths in sunlight and convert them into electrical energy.

[0003] Although photovoltaic films with light conversion functions can convert light of specific wavelengths into a spectrum band that solar cells are more sensitive to, improving the utilization rate of light energy. The wavelength range of ultraviolet light emitted by sunlight in the electromagnetic spectrum is roughly 10~400 nanometers. This range starts at the short-wave limit of visible light and overlaps with the long-wave wavelength of X-rays. Ultraviolet light is usually divided into three bands:

[0004] Long-wave ultraviolet rays (UVA): The wavelength range is 315~400 nanometers.

[0005] Ultraviolet rays (UVB): The wavelength range is 280~315 nanometers.

[0006] Short-wave ultraviolet rays (UVC): The wavelength range is 100~280 nanometers, but most of them are absorbed in the process of penetrating the atmosphere. Therefore, there are few short-wave ultraviolet rays irradiated on the photovoltaic film, and most of them are long-wave ultraviolet rays. The existing photovoltaic film is provided with a light conversion layer, and the light conversion layer is provided with a light conversion agent, but the light conversion efficiency of the light conversion agent is different in different environments. At the same time, the light conversion agent will degrade or thermally degrade when exposed to sunlight for a long time, resulting in a decrease in light conversion performance. There are also cases where the surface of the photovoltaic film is scratched during transportation and installation. The influence of the environment on the photovoltaic film will accelerate the aging of the film.

[0007] Therefore, it is particularly important to develop a photovoltaic film with good anti-aging properties, good light conversion performance, good light transmittance and long service life. Utility Model Content

[0008] The present application provides a photovoltaic film with light conversion function, which adopts the following technical solution:

[0009] A polyester protective layer is arranged on the photovoltaic film, an anti-reflection layer is arranged below the polyester protective layer, a barrier layer is arranged below the anti-reflection layer, a light conversion layer is arranged below the barrier layer, and an adhesive layer is arranged below the light conversion layer, and each layer of film is laminated together into one.

[0010] Optionally, the polyester protective layer is set to have a thickness of 20-30 nanometers.

[0011] Optionally, the anti-reflection layer adopts a double-layer anti-reflection coating design, using a silicon nitride coating and a silicon oxide coating.

[0012] Optionally, the antireflection layer has a thickness of 20-30 nanometers.

[0013] Optionally, a UV absorbing coating is provided on the barrier layer, and the barrier layer has a thickness of 40-60 nanometers.

[0014] Optionally, the light-converting layer is made of EPE film, which is formed by laminating multiple layers of film, with the middle layer being POE film, and EVA films being arranged above and below the POE film.

[0015] Optionally, copper indium sulfide particles are provided in the POE film, and the copper indium sulfide particles can convert long-wave ultraviolet rays of 280-500 nanometers into visible light of 500-800 nanometers.

[0016] Optionally, the outer layer of the copper indium sulfide particles is wrapped with a silicon oxide shell.

[0017] Optionally, the diameter of the copper indium sulfide particles is 30 microns, the thickness of the outer silicon oxide shell is 30 nanometers, and the thickness of the light conversion layer is 55-65 microns.

[0018] Optionally, the adhesive layer has a layer thickness of 5-10 microns.

[0019] Compared with the prior art, the utility model has the following beneficial effects: the polyester protective layer is set to protect the surface of the photovoltaic film from external erosion and damage during transportation or use; the anti-reflection layer uses an upper silicon nitride coating and a lower silicon oxide coating double-layer film setting, which can effectively reduce the reflectivity of sunlight on the surface of the photovoltaic film to less than 1%, and irradiate sunlight to the lower barrier layer; the UV absorption coating set on the barrier layer absorbs short-wave ultraviolet and medium-wave ultraviolet in ultraviolet rays, and transmits long-wave ultraviolet rays to the conversion layer; the conversion layer uses EPE film as the main material, and the conversion material set in the middle layer POE film of the EPE film is indium copper sulfide particles, and a silicon oxide shell is also set on the outer shell of the indium copper sulfide particles, which can absorb short-wave and medium-wave ultraviolet rays not absorbed by the barrier layer, thereby improving the conversion efficiency. The adhesive layer can make the photovoltaic film adhere well to the electronic components and not fall off easily. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the utility model.

[0022] In the figure: 1-polyester protective layer, 2-anti-reflection layer, 3-barrier layer, 4-light conversion layer, 5-adhesive layer. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the various 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 of 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.

[0024] The embodiment of the utility model provides a photovoltaic adhesive film with light conversion function.

[0025] like Figure 1 As shown, embodiment 1 includes a photovoltaic adhesive film, on which a polyester protective layer 1 is arranged.

[0026] An anti-reflection layer 2 is disposed below the polyester protective layer 1, a barrier layer 3 is disposed below the anti-reflection layer 2, a light conversion layer 4 is disposed below the barrier layer 3, and an adhesive layer 5 is disposed below the light conversion layer 4, and the layers are laminated together into one body.

[0027] The polyester protective layer 1 is the outermost layer of the photovoltaic film. The polyester protective layer 1 can protect the photovoltaic film from harmful substances, moisture, etc. in the external environment, thereby ensuring the stability and long-term service life of the photovoltaic module. The polyester protective layer 1 has excellent resistance to environmental erosion, and can effectively prevent moisture and oxygen from penetrating into the interior of the photovoltaic film, preventing the film from aging or damage. The polyester protective layer 1 is composed of a polymer material, preferably a polyester resin, which is coated on the surface of the photovoltaic film through a specific process to form the polyester protective layer 1. The layer thickness of the polyester protective layer 1 is set to 20-30 nanometers, preferably 24 nanometers.

[0028] The main function of the anti-reflection layer 2 is to reduce the reflection of sunlight on the surface of the photovoltaic film, and it is a key component for improving the photoelectric conversion efficiency. The anti-reflection layer 2 is composed of a multi-layer thin film, including a silicon oxide layer, a silicon nitride layer, an aluminum oxide layer, etc. In the present invention, the anti-reflection layer 2 adopts a double-layer anti-reflection coating design, the first layer adopts a silicon nitride coating, and a silicon oxide coating is also arranged under the silicon nitride coating. The silicon nitride and silicon oxide double coating structure can reduce the reflectivity of sunlight on the surface of the photovoltaic film to less than 1%, and can maximize the use of solar energy. The thickness of the anti-reflection layer 2 is 20-30 nanometers.

[0029] The barrier layer 3 is provided with a UV absorbing coating, which can absorb short-wave ultraviolet rays and medium-wave ultraviolet rays in ultraviolet light. Since short-wave ultraviolet rays and medium-wave ultraviolet rays are absorbed after ultraviolet rays pass through the atmosphere, the short-wave ultraviolet rays and medium-wave ultraviolet rays irradiated on the photovoltaic film are less. The barrier layer 3 is used to absorb the short-wave ultraviolet rays and medium-wave ultraviolet rays irradiated on the photovoltaic film, and transmit the long-wave ultraviolet rays to the light conversion layer 4. The barrier layer 3 has a thickness of 40-60 nanometers.

[0030] The light conversion layer 4 is made of EPE film, which is formed by laminating multiple layers of film, and the middle layer is POE film, and EVA film is arranged above and below the POE film. Sulfur indium copper particles are arranged in the POE film, and the sulfur indium copper particles can convert 280-500 nanometers of long-wave ultraviolet rays into 500-800 nanometers of visible light. The outer layer of the sulfur indium copper particles is wrapped with a silicon oxide shell to absorb short-wave ultraviolet rays and long-wave ultraviolet rays to avoid affecting the light conversion efficiency of the sulfur indium copper particles. The diameter of the sulfur indium copper particles is 30 microns, and the outer layer of the silicon oxide shell is 30 nanometers thick. The thickness of the light conversion layer is 55-65 microns.

[0031] The purpose of the bonding layer 5 is to bond the photovoltaic film and the electronic components or glass to ensure that they are tightly connected to prevent separation or falling off during use, and the bonding effect helps to form a stable structural whole, thereby improving the mechanical strength and stability of the photovoltaic module. The material used in the bonding layer 5 is EVA film, which has excellent flexibility, impact resistance, elasticity, optical transparency, low-temperature flexibility, adhesion, and environmental stress cracking resistance. The EVA film on the bonding layer 5 can protect the electronic components and batteries. The EVA film on the bonding layer 5 and the EPE film on the light conversion layer 4 can be effectively bonded together to improve the stability of the photovoltaic film. The thickness of the bonding layer 5 is 5-10 microns.

[0032] Embodiment 2: An antistatic layer may be further provided on the adhesive layer 5, and its function is to prevent safety accidents caused by electrical failure when the battery elements are adhered. Conductive polymers or carbon nanotubes may be used as the matrix material, and other features are the same as those of Embodiment 1.

[0033] In summary, the light-converting photovoltaic film provided in the present invention improves the power generation efficiency of photovoltaic modules by removing short-wave and medium-wave ultraviolet rays and converting ultraviolet light into visible light by absorbing and converting long-wave ultraviolet rays. The light-converting agent in the light-converting layer 4 improves the light-conversion efficiency. At the same time, the polyester protective layer 1 and the adhesive layer 5 protect the photovoltaic film in both directions, thereby increasing the service life of the photovoltaic film.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims, rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A photovoltaic film with light conversion function, characterized in that: A polyester protective layer (1) is provided on the photovoltaic adhesive film, an anti-reflection layer (2) is provided below the polyester protective layer (1), a barrier layer (3) is provided below the anti-reflection layer (2), a light conversion layer (4) is provided below the barrier layer (3), and an adhesive layer (5) is provided below the light conversion layer (4), and the layers of the film are laminated together to form a whole.

2. The photovoltaic adhesive film with light conversion function according to claim 1, characterized in that: The thickness of the polyester protective layer (1) is set to 20-30 nanometers.

3. The photovoltaic adhesive film with light conversion function according to claim 1, characterized in that: The anti-reflection layer (2) adopts a double-layer anti-reflection coating design, which adopts a silicon nitride coating and a silicon oxide coating.

4. The photovoltaic adhesive film with light conversion function according to claim 1, characterized in that: The anti-reflection layer (2) has a thickness of 20-30 nanometers.

5. The photovoltaic adhesive film with light conversion function according to claim 1, characterized in that: A UV absorbing coating is provided on the barrier layer (3), and the barrier layer (3) has a thickness of 40-60 nanometers.

6. The photovoltaic adhesive film with light conversion function according to claim 1, characterized in that: The light conversion layer (4) is made of EPE film, which is formed by laminating multiple layers of film, wherein the middle layer is POE film, and EVA films are arranged above and below the POE film.

7. The photovoltaic adhesive film with light conversion function according to claim 6, characterized in that: The POE film is equipped with copper indium sulfide particles, which can convert long-wave ultraviolet rays of 280-500 nanometers into visible light of 500-800 nanometers.

8. The photovoltaic adhesive film with light conversion function according to claim 7, characterized in that: The copper indium sulfide particles are covered with a silicon oxide shell.

9. The photovoltaic adhesive film with light conversion function according to claim 7, characterized in that: The diameter of the indium copper sulfide particles is 30 microns, the thickness of the outer silicon oxide shell is 30 nanometers, and the thickness of the light conversion layer (4) is 55-65 microns.

10. The photovoltaic adhesive film with light conversion function according to claim 1, characterized in that: The thickness of the adhesive layer (5) is 5-10 microns.

Images