CN105206697B - Solar photovoltaic module and preparation method thereof - Google Patents

Abstract

The invention relates to a solar photovoltaic module and a preparation method thereof. The solar cell module comprises a first glass substrate, a transparent first packaging layer, a reflecting layer, a transparent second packaging layer, a solar cell and a second glass substrate, wherein the first packaging layer, the reflecting layer, the second packaging layer and the second glass substrate are sequentially stacked on the first glass substrate, the second packaging layer is provided with a closed accommodating cavity, the solar cell is accommodated in the accommodating cavity, the second glass substrate is provided with a pattern surface, the pattern surface is provided with a pattern formed by a plurality of protrusions arranged at intervals, the pattern surface of the second glass substrate is stacked with the second packaging layer, and the reflectivity of the reflecting layer is more than 60%. The solar photovoltaic module has better optical efficiency and conversion efficiency.

Description

Solar photovoltaic module and preparation method thereof

technical field

The invention relates to the field of solar energy, in particular to a solar photovoltaic module and a preparation method thereof.

Background technique

At present, double-glass photovoltaic module technology is entering a period of rapid development, and people's dual requirements for the conversion efficiency and reliability of photovoltaic modules have promoted the continuous progress of double-glass module technology. However, the current double-glass photovoltaic modules still have the problems of low optical utilization and conversion efficiency.

Contents of the invention

Based on this, it is necessary to provide a solar photovoltaic module with high optical utilization and conversion efficiency.

In addition, a method for preparing a solar photovoltaic module is also provided.

A solar photovoltaic module, comprising a first glass substrate, a transparent first encapsulation layer, a reflective layer, a transparent second encapsulation layer, solar cells and a second glass substrate, the first encapsulation layer, the reflective layer, The second encapsulation layer and the second glass substrate are sequentially laminated on the first glass substrate, the second encapsulation layer has a closed accommodation cavity, the solar cells are accommodated in the accommodation cavity, and the The second glass substrate has a pattern surface, and the pattern surface is provided with a pattern composed of a plurality of protrusions arranged at intervals, and the second encapsulation layer is laminated with the pattern surface of the second glass substrate, so The reflectivity of the reflective layer is above 60%.

In one embodiment, the reflective layer is made of polyethylene terephthalate or polyimide.

In one of the embodiments, it further includes an anti-reflection film formed on the side of the second glass substrate away from the pattern surface.

In one embodiment, the height of each of the protrusions is 30 microns to 50 microns.

In one embodiment, the reflective layer has a thickness of 50 microns to 200 microns.

A method for preparing a solar photovoltaic module, comprising the steps of:

Forming a first encapsulation adhesive layer on the first glass substrate, wherein the material of the first encapsulation adhesive layer is an uncrosslinked ethylene-vinyl acetate copolymer;

A reflective layer is provided, a first adhesive layer and a second adhesive layer are formed on two opposite surfaces of the reflective layer, the reflective layer is laminated on the first packaging adhesive layer, and the second An adhesive layer is laminated with the first packaging adhesive layer, wherein the materials of the first adhesive layer and the second adhesive layer are both uncrosslinked ethylene-vinyl acetate copolymers, and the reflective The reflectivity of the layer is above 60%;

disposing the solar cells in the middle of the second adhesive layer;

Form a second encapsulation adhesive layer on the second adhesive layer, and make the second encapsulation adhesive layer cover the solar cells, wherein, the material of the second encapsulation adhesive layer is uncrosslinked ethylene- Vinyl acetate copolymer;

A second glass substrate is provided, the second glass substrate has a pattern surface, and the pattern surface is provided with a pattern consisting of a plurality of protrusions arranged at intervals, and the second glass substrate is laminated on the second encapsulant layer, and laminating the pattern surface of the second glass substrate and the second encapsulation layer to obtain a semi-finished product; and

hot pressing the semi-finished product, so that the first adhesive layer and the first encapsulation adhesive layer are cross-linked and polymerized to form a transparent first encapsulation layer, and the second adhesive layer and the second encapsulation adhesive The layers are cross-linked and polymerized to form a transparent second encapsulation layer with a cavity for accommodating the solar cells to obtain the solar photovoltaic module.

In one of the embodiments, it further includes the step of forming the first adhesive layer and the second adhesive layer on the two opposite surfaces of the reflective layer: on the two opposite surfaces of the reflective layer The surface is coated with uncrosslinked ethylene-vinyl acetate copolymer to form the first adhesive layer and the second adhesive layer.

In one embodiment, the thickness of the first adhesive layer is 25 microns to 100 microns, and the thickness of the second adhesive layer is 25 microns to 100 microns.

In one of the embodiments, before the step of laminating the second glass substrate on the second encapsulant layer, it further includes forming an antireflection layer on the side of the second glass substrate away from the pattern surface. Membrane steps.

In one embodiment, the thickness of the first packaging adhesive layer is 0.45 mm to 0.6 mm; the thickness of the second packaging adhesive layer is 0.45 mm to 0.6 mm.

The reflection rate of the reflective layer of the above-mentioned solar photovoltaic module is above 60%, which has a good light reflection effect, and the second glass substrate has a pattern surface, and the pattern surface is provided with a pattern composed of a plurality of protrusions arranged at intervals. The patterned surface of the second glass substrate can make the total reflection of light occur as much as possible, by setting a reflective layer on the back of the solar cell sheet, and setting the second glass substrate facing inward on the front side of the solar cell sheet as the patterned surface, so that there is no The incident light absorbed by the solar cells is reflected after encountering the reflective layer, part of the light is reflected to the solar cell and absorbed by the solar cell, and part of the light is reflected to the pattern surface of the second glass substrate for total reflection and is absorbed by the solar cell. Absorption by solar cells, so that the incident light can be absorbed by the solar cells as much as possible, thus effectively improving the utilization rate of the incident light of the solar photovoltaic module, making it have high optical efficiency, thereby effectively improving the efficiency of the solar photovoltaic module The conversion efficiency makes the above-mentioned solar photovoltaic modules have higher optical efficiency and conversion efficiency.

Description of drawings

Fig. 1 is a schematic structural view of a solar photovoltaic module of an embodiment;

Fig. 2 is a structural schematic diagram of another angle of the second glass substrate of the solar photovoltaic module shown in Fig. 1;

Fig. 3 is the flowchart of the preparation method of the solar photovoltaic module of an embodiment;

FIG. 4 is a schematic structural view of a reflective layer formed with a first adhesive layer and a second adhesive layer in step S120 of the method for preparing a solar photovoltaic module shown in FIG. 3;

5 is a schematic structural view of a second glass substrate formed with an anti-reflection film in the method for preparing the solar photovoltaic module shown in FIG. 3;

FIG. 6 is an exploded view of a semi-finished product obtained by the method for preparing the solar photovoltaic module shown in FIG. 3 .

detailed description

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in FIG. 1 , a solar photovoltaic module 100 according to one embodiment includes a first glass substrate 110 , a first encapsulation layer 120 , a reflective layer 130 , a second encapsulation layer 140 , solar cells 150 and a second glass substrate 160 .

Wherein, the first glass substrate 110 is a tempered glass plate or a semi-tempered glass plate. The thickness of the first glass substrate 110 is 2 millimeters to 4 millimeters.

The first encapsulation layer 120 is stacked on the first glass substrate 110 . The first encapsulation layer 120 is transparent. Wherein, the material of the first encapsulation layer 120 is cross-linked ethylene-vinyl acetate copolymer.

The reflective layer 130 is stacked on a side of the first encapsulation layer 120 away from the first glass substrate 110 . The reflective layer 130 is made of polyethylene terephthalate or polyimide. Polyethylene terephthalate or polyimide has good mechanical properties and high surface hardness, so as to avoid twisting and wrinkling of the solar photovoltaic module 100 .

Wherein, the reflective layer 130 has a thickness of 50 micrometers to 200 micrometers.

Wherein, the reflectivity of the reflective layer 130 is above 60%, so that the reflective layer 130 has better reflectivity of light and improves the optical efficiency of the solar photovoltaic module 100 .

The second encapsulation layer 140 is transparent. The second encapsulation layer 140 is stacked on the side of the reflective layer 130 away from the first encapsulation layer 120 , and the second encapsulation layer 140 has a closed receiving cavity 142 .

Wherein, the material of the second encapsulation layer 140 is cross-linked ethylene-vinyl acetate copolymer. Compared with the encapsulation layer added with a benzophenone-based ultraviolet absorber, the second encapsulation layer 140 using only ethylene-vinyl acetate copolymer can allow the incident light in the short-wavelength band passing through the second glass substrate 160 to pass through more smoothly, Furthermore, it is absorbed by the solar battery sheet 150 .

The solar cells 150 are accommodated in the accommodation cavity 142 of the second encapsulation layer 140 . Wherein, there are multiple solar battery slices 150, and the multiple solar battery slices 150 are connected in series. Specifically, a plurality of solar cells 150 are arranged in a row. At this time, the plurality of solar cells 150 can be accommodated in one accommodation cavity 142; The cavity 142 accommodates a solar cell 150 .

Please also refer to FIG. 2, the second glass substrate 160 has a pattern surface 162, and the pattern surface 162 is provided with a pattern consisting of a plurality of spaced apart protrusions 1622. The second glass substrate 160 is stacked on the second encapsulation layer 140 away from reflection On one side of the layer 130 , the pattern surface 162 of the second glass substrate 160 is laminated with the second encapsulation layer 140 . The patterned surface 162 of the second glass substrate 160 is laminated with the second encapsulation layer 140 so that the light in the solar photovoltaic module 100 that is not absorbed by the solar cells 150 but is reflected back by the reflective layer 130 can be totally reflected as much as possible, thereby as much as possible The ground is utilized by the solar battery sheet 150 to improve the optical utilization rate, thereby effectively improving the conversion efficiency of the solar photovoltaic module 100 .

Wherein, the height of each protrusion 1622 is 30-50 microns. In this embodiment, the cross section of the protrusion 1622 is approximately square. Preferably, from the fixed end to the free end, the side length of the cross section of the protrusion 1622 decreases gradually. The side length of the end surface of the fixed end of the protrusion 1622 is 1-3 mm, preferably 2 mm. Four edges of the protrusion 1622 have rounded corners. The protrusions 1622 of this structure can make the patterned surface of the second glass substrate 160 have a better total reflection effect on light. It can be understood that the cross-section of the protrusion 1622 can be a regular shape such as a circle, a rhombus, or a triangle, or an irregular shape.

Wherein, the pattern on the second glass substrate 160 is prepared through an embossing process.

Wherein, the second glass substrate 160 is a tempered glass plate. The thickness of the second glass substrate 160 is 2mm-4mm.

In this embodiment, the solar photovoltaic module 100 further includes an antireflection film 170 formed on a side of the second glass substrate 160 away from the pattern surface 162 . The transmittance of short-wavelength (300nm-400nm) light can be increased by disposing the anti-reflection film 170 .

Wherein, the anti-reflection film 170 is a silicon dioxide film or a titanium dioxide film. In addition, the thickness of the anti-reflection film 170 is 90 nanometers to 110 nanometers.

The reflection rate of the reflective layer 130 of the above-mentioned solar photovoltaic module 100 is above 60%, which has a good light reflection effect, and the second glass substrate 160 has a pattern surface 162, and the pattern surface 162 is provided with a plurality of protrusions arranged at intervals. The pattern composed of 1622, the pattern surface of the second glass substrate can make the total reflection of light as far as possible, by setting the reflective layer 130 on the back side of the solar battery sheet 150, and the second glass substrate 160 on the front side of the solar battery sheet 150 The inward side is set as a pattern surface 162, and the pattern surface 162 is provided with a pattern consisting of a plurality of protrusions 1622 arranged at intervals, so that the incident light that is not absorbed by the solar cell sheet 150 is reflected after encountering the reflective layer 130, A part of the light is reflected to the solar cell sheet 150 and absorbed by the solar cell sheet 150, and a part of the light is reflected to the pattern surface 162 of the second glass substrate 160 to be absorbed by the cell sheet 150, thereby effectively improving the performance of the solar photovoltaic module 100. The utilization rate of the incident light makes it have higher optical efficiency, thereby effectively improving the conversion efficiency of the solar photovoltaic module 100, so that the solar photovoltaic module 100 has higher optical efficiency and conversion efficiency.

Moreover, the solar photovoltaic module 100 with the above-mentioned structure has better airtightness, better waterproof performance, can effectively prevent water vapor from intruding into the interior of the solar photovoltaic module 100, and has better weather resistance.

As shown in FIG. 3 , a method for preparing a solar photovoltaic module according to an embodiment is a method for preparing the above-mentioned solar photovoltaic module. The preparation method of the solar photovoltaic module comprises the following steps:

Step S210: forming a first packaging adhesive layer on the first glass substrate.

Wherein, the first glass substrate is a tempered glass plate or a semi-tempered glass plate. The thickness of the first glass substrate is 2 mm to 4 mm.

Wherein, the material of the first packaging adhesive layer is uncrosslinked ethylene-vinyl acetate copolymer (EVA). The thickness of the first encapsulation adhesive layer is 0.45mm-0.6mm.

Step S220: providing a reflective layer, a first adhesive layer and a second adhesive layer are formed on two opposite surfaces of the reflective layer, the reflective layer is stacked on the first packaging adhesive layer, and the first adhesive layer and The first encapsulation adhesive layer is laminated.

Wherein, the materials of the first adhesive layer and the second adhesive layer are both uncrosslinked ethylene-vinyl acetate copolymers.

Specifically, it also includes the step of forming a first adhesive layer and a second adhesive layer on the two opposite surfaces of the reflective layer: coating the two opposite surfaces of the reflective layer with uncrosslinked ethylene-acetic acid A vinyl ester copolymer to form the first adhesive layer and the second adhesive layer.

Wherein, the thickness of the first adhesive layer is 25 microns to 100 microns; the thickness of the second adhesive layer is 25 microns to 100 microns; the thickness of the reflective layer is 50 microns to 200 microns.

Wherein, the reflectivity of the reflective layer is above 60%. The reflective layer is made of polyethylene terephthalate or polyimide.

As shown in FIG. 4 , a first adhesive layer 320 and a second adhesive layer 330 are respectively formed on two opposite surfaces of the reflective layer 310 .

Step S230: disposing the solar battery sheet in the middle of the second adhesive layer.

Wherein, there are a plurality of solar cells, the plurality of solar cells are connected in series, and the plurality of solar cells are arranged on the second adhesive layer.

Step S240: forming a second encapsulation adhesive layer on the second adhesive layer, and making the second encapsulation adhesive layer cover the solar cells.

Wherein, the material of the second encapsulating adhesive layer is uncrosslinked ethylene-vinyl acetate copolymer.

Wherein, the thickness of the second encapsulation adhesive layer is 0.45mm-0.6mm.

Step S250: providing a second glass substrate, the second glass substrate has a pattern surface, and the pattern surface is provided with a pattern consisting of a plurality of protrusions arranged at intervals, and the second glass substrate is laminated on the second packaging adhesive layer, and the The pattern surface of the second glass substrate is laminated with the second packaging layer to obtain a semi-finished product.

Specifically, the pattern on the pattern surface of the second glass substrate is formed by an embossing process. The specific forming method is: forming by extruding glass during the forming process of the second glass substrate. And the extrusion depth is 30 microns to 50 microns. The tools used for extrusion are rollers.

Wherein, the height of each protrusion is 30 microns to 50 microns. In this embodiment, the cross-section of the protrusion is approximately square. Preferably, from the fixed end to the free end, the side length of the cross-section of the protrusion decreases gradually. The side length of the end face of the raised fixed end is 1-3 mm, preferably 2 mm. The raised four edges have rounded corners. The protrusions of this structure can make the patterned surface of the second glass substrate have a better total reflection effect on light. It can be understood that the cross-section of the protrusions can be regular shapes such as circles, rhombuses, triangles, etc., or irregular shapes.

Wherein, the second glass plate substrate is a tempered glass plate. The thickness of the second glass substrate is 2 mm to 4 mm.

Wherein, before the step of laminating the second glass substrate on the second encapsulation layer, a step of forming an anti-reflection film on the side of the second glass substrate away from the pattern surface is also included.

Wherein, the material of the anti-reflection film is silicon dioxide or titanium dioxide. In addition, the thickness of the antireflection film is 90 nanometers to 110 nanometers.

As shown in FIG. 5 , one surface of the second glass substrate 400 is a pattern surface 410, and the pattern surface 410 is provided with a pattern consisting of a plurality of protrusions arranged at intervals. The anti-reflection film 500 is formed on the second glass substrate 400 away from the first On the pattern surface 410 of the second glass substrate 400 .

Please refer to FIG. 6 together. FIG. 6 is an exploded view of a semi-finished product. In the illustrated embodiment, from bottom to top, there are first glass substrate 600, first encapsulation adhesive layer 700, reflective layer 310, solar cell sheet 800, The second packaging adhesive layer 900 , the second glass substrate 400 and the anti-reflection film 500 . A first adhesive layer 320 and a second adhesive layer 330 are formed on opposite surfaces of the reflective layer 310 . The first packaging adhesive layer 700 is laminated with the first adhesive layer 320 , and the solar cell 800 is disposed on the second adhesive layer 330 .

Step S260: heat-press the semi-finished product, so that the first adhesive layer and the first sealing layer are cross-linked and polymerized to form a transparent first packaging layer, and the second adhesive layer and the second packaging layer are cross-linked and polymerized to form an The second transparent encapsulation layer of the cell sheet's accommodating cavity is used to obtain a solar photovoltaic module.

Specifically, the hot pressing temperature is 135°C-145°C.

The preparation method of the above-mentioned solar photovoltaic module is simple in operation and easy in industrialized production. And the above-mentioned preparation method uses the reflective layer that is formed with the first adhesive layer and the second adhesive layer on the opposite two surfaces, and the first adhesive layer, the second adhesive layer, the first encapsulation adhesive layer, the second The material of the encapsulation adhesive layer is uncrosslinked ethylene-vinyl acetate copolymer. After hot pressing, the first adhesive layer and the first encapsulation adhesive layer are cross-linked and polymerized to form a transparent first encapsulation layer, and the second adhesive layer and the second encapsulation layer are cross-linked and polymerized to form a transparent second encapsulation layer with a cavity for accommodating solar cells, in which the first adhesive layer and the second adhesive layer serve as transition layers, enabling the reflective layer and the first There is a good sealing and bonding effect between the encapsulation layers and between the reflective layer and the second encapsulation layer, so that the solar cells are well encapsulated. And the first adhesive layer and the second adhesive layer as the transition layer can effectively avoid the distortion and wrinkle problem of the solar photovoltaic module during the hot pressing process, avoiding the current double glass photovoltaic module in order to improve the optical utilization and conversion efficiency. Adding a high-reverse encapsulation layer on the back of the solar cell, the uneven distribution of titanium dioxide particles in the high-resistance encapsulation film during the hot pressing process causes the appearance of wrinkles on the edges of the double-glass photovoltaic module and white titanium dioxide overflowing from the front of the solar cell bad question.

At the same time, the reflective layer is made of polyimide or polyethylene terephthalate, and these two materials have good hardness, which further avoids the problem of twisting and wrinkling of the solar photovoltaic module during the hot pressing process.

Moreover, the solar photovoltaic module prepared by the method for preparing the solar photovoltaic module has higher optical utilization rate, higher conversion efficiency and better weather resistance.

The following is the specific embodiment part:

Example 1

The preparation process of the solar photovoltaic module of the present embodiment is as follows:

(1) Forming a first packaging adhesive layer on the first glass substrate. Wherein, the first glass substrate is a toughened glass plate; the thickness of the first glass substrate is 3 millimeters; the material of the first packaging adhesive layer is uncrosslinked ethylene-vinyl acetate copolymer; the thickness of the first packaging adhesive layer is 0.5 mm.

(2) providing a reflective layer with a thickness of 150 microns and a reflectivity of 60%; coating uncrosslinked ethylene-vinyl acetate copolymers on opposite surfaces of the reflective layer respectively to form a thickness of 60 microns. An adhesive layer and a second adhesive layer with a thickness of 60 microns, the reflective layer is laminated on the first encapsulation adhesive layer, and the first adhesive layer and the first encapsulation adhesive layer are laminated, wherein the material of the reflective layer is Polyethylene terephthalate.

(3) The solar cells are arranged in the middle of the second adhesive layer.

(4) Form a second encapsulation adhesive layer with a thickness of 0.5 mm on the second adhesive layer, and make the second adhesive layer cover the solar cells, wherein the material of the second encapsulation layer is uncrosslinked ethylene-acetic acid vinyl ester copolymer.

(5) In the forming process of the second glass substrate, an embossing process is used to extrude the glass with a roller, and the extrusion depth is 40 microns to obtain a second glass substrate with a patterned surface, and the patterned surface is provided with a plurality of spacers. A pattern composed of raised protrusions, the height of each protrusion is 40 microns, the cross-section of the protrusions is roughly square, and the edges of the protrusions have rounded corners, from the fixed end to the free end, the cross-section of the protrusions is The side length gradually decreases, and the cross-section of the raised fixed end is a square with a side length of 2 mm; and the thickness of the second glass substrate is 2 mm; silicon dioxide AR coating. The second glass substrate is laminated on the second encapsulation adhesive layer, and the pattern surface of the second glass substrate is laminated on the second encapsulation adhesive layer to obtain a semi-finished product.

(6) Heat press the semi-finished product at 140°C to cross-link and polymerize the first adhesive layer and the first encapsulating adhesive layer to obtain a transparent first encapsulating layer, and cross-link and polymerize the second adhesive layer and the second encapsulating adhesive layer A transparent second encapsulation layer having a cavity for accommodating the solar cells is obtained, and the solar photovoltaic module of this embodiment is obtained.

Since the short-circuit current can reflect the optical utilization ratio of the solar photovoltaic module, the optical utilization ratio of the solar photovoltaic module of this embodiment is characterized by using the Spire tester to test the short-circuit current method of the solar photovoltaic module.

Since the output power can reflect the conversion efficiency of the solar photovoltaic module, a Spire tester is used to test the output power of the solar photovoltaic module to characterize the conversion efficiency of the solar photovoltaic module of this embodiment.

The short-circuit circuit and output power of the solar photovoltaic module in this embodiment are shown in Table 1.

Example 2

The preparation process of the solar photovoltaic module of the present embodiment is as follows:

(1) Forming a first packaging adhesive layer on the first glass substrate. Wherein, the first glass substrate is a semi-tempered glass plate; the thickness of the first glass substrate is 2 millimeters; the material of the first packaging adhesive layer is uncrosslinked ethylene-vinyl acetate copolymer; the thickness of the first packaging adhesive layer is 0.45 mm.

(2) providing a reflective layer with a thickness of 50 microns and a reflectivity of 70%; coating uncrosslinked ethylene-vinyl acetate copolymers on opposite surfaces of the reflective layer respectively to form a thickness of 25 microns. An adhesive layer and a second adhesive layer with a thickness of 25 microns, the reflective layer is laminated on the first encapsulation adhesive layer, and the first adhesive layer and the first encapsulation adhesive layer are laminated, wherein the material of the reflective layer is Polyethylene terephthalate.

(3) The solar cells are arranged in the middle of the second adhesive layer.

(4) Forming a second encapsulation adhesive layer with a thickness of 0.45 millimeters on the second adhesive layer, and making the second adhesive layer cover the solar cells, wherein the material of the second encapsulation adhesive layer is uncrosslinked ethylene- Vinyl acetate copolymer.

(5) In the forming process of the second glass substrate, an embossing process is adopted to extrude the glass with a roller, and the extrusion depth is 30 microns to obtain a second glass substrate with a patterned surface, and the patterned surface is provided with a plurality of spacers. A pattern composed of raised protrusions, the height of each protrusion is 30 microns, the cross-section of the protrusions is roughly square, and the edges of the protrusions have rounded corners, from the fixed end to the free end, the cross-section of the protrusions is The side length gradually decreases, and the cross-section of the raised fixed end is a square with a side length of 3 mm; and the thickness of the second glass substrate is 3 mm; a thickness of 90 is formed on the side of the second glass substrate away from the pattern surface Nano titanium dioxide anti-reflection coating. The second glass substrate is laminated on the second encapsulation adhesive layer, and the pattern surface of the second glass substrate is laminated on the second encapsulation adhesive layer to obtain a semi-finished product.

(6) Heat press the semi-finished product at 135°C to cross-link and polymerize the first adhesive layer and the first encapsulating adhesive layer to obtain a transparent first encapsulating layer, and cross-link and polymerize the second adhesive layer and the second encapsulating adhesive layer A transparent second encapsulation layer having a cavity for accommodating a plurality of solar cells is obtained, and the solar photovoltaic module of this embodiment is obtained.

Using the same test method as in Example 1, the short-circuit circuit and output power of the solar photovoltaic module obtained in this example are shown in Table 1.

Example 3

The preparation process of the solar photovoltaic module of the present embodiment is as follows:

(1) Forming a first packaging adhesive layer on the first glass substrate. Wherein, the first glass substrate is a toughened glass plate; the thickness of the first glass substrate is 4 millimeters; the material of the first packaging adhesive layer is uncrosslinked ethylene-vinyl acetate copolymer; the thickness of the first packaging adhesive layer is 0.6 mm.

(2) providing a reflective layer with a thickness of 200 microns and a reflectivity of 90%; on the opposite two surfaces of the reflective layer, coatings containing uncrosslinked ethylene-vinyl acetate copolymers respectively form a thickness of 100 microns The first adhesive layer and the second adhesive layer with a thickness of 100 microns laminate the reflective layer on the first encapsulation adhesive layer, and laminate the first adhesive layer and the first encapsulation adhesive layer, wherein the material of the reflective layer For polyethylene terephthalate.

(3) The solar cells are arranged in the middle of the second adhesive layer.

(4) Forming a second encapsulation adhesive layer with a thickness of 0.6 millimeters on the second adhesive layer, and making the second adhesive layer cover the solar cells, wherein the material of the second encapsulation adhesive layer is uncrosslinked ethylene- Vinyl acetate copolymer.

(5) In the forming process of the second glass substrate, an embossing process is used to extrude the glass with a roller, and the extrusion depth is 50 microns to obtain a second glass substrate with a pattern surface, and the pattern surface is provided with a plurality of spacers. A pattern composed of raised protrusions, the height of each protrusion is 50 microns, the cross-section of the protrusions is roughly square, and the edges of the protrusions have rounded corners, from the fixed end to the free end, the cross-section of the protrusions is The side length gradually decreases, and the cross section of the raised fixed end is a square with a side length of 3 millimeters; and the thickness of the second glass substrate is 4 millimeters; a thickness of 110 nanometers is formed on the side of the second glass substrate away from the pattern surface silicon dioxide AR coating. The second glass substrate is laminated on the second encapsulation adhesive layer, and the pattern surface of the second glass substrate is laminated on the second encapsulation adhesive layer to obtain a semi-finished product.

(6) Heat press the semi-finished product at 145°C to cross-link and polymerize the first adhesive layer and the first encapsulating adhesive layer to obtain a transparent first encapsulating layer, and cross-link and polymerize the second adhesive layer and the second encapsulating adhesive layer A transparent second encapsulation layer having a cavity for accommodating the solar cells is obtained, and the solar photovoltaic module of this embodiment is obtained.

Using the same test method as in Example 1, the short-circuit circuit and output power of the solar photovoltaic module obtained in this example are shown in Table 1.

Example 4

The preparation process of the solar photovoltaic module of the present embodiment is as follows:

(1) Forming a first packaging adhesive layer on the first glass substrate. Wherein, the first glass substrate is a toughened glass plate; the thickness of the first glass substrate is 3 millimeters; the material of the first packaging adhesive layer is uncrosslinked ethylene-vinyl acetate copolymer; the thickness of the first packaging adhesive layer is 0.5 mm.

(2) providing a reflective layer with a thickness of 150 microns and a reflectivity of 60%; coating uncrosslinked ethylene-vinyl acetate copolymers on opposite surfaces of the reflective layer respectively to form a thickness of 60 microns. An adhesive layer and a second adhesive layer with a thickness of 60 microns, the reflective layer is laminated on the first encapsulation adhesive layer, and the first adhesive layer and the first encapsulation adhesive layer are laminated, wherein the material of the reflective layer is Polyimide.

(3) The solar cells are arranged in the middle of the second adhesive layer.

(4) Form a second encapsulation adhesive layer with a thickness of 0.5 mm on the second adhesive layer, and make the second adhesive layer cover the solar cells, wherein the material of the second encapsulation layer is uncrosslinked ethylene-acetic acid vinyl ester copolymer.

(5) In the forming process of the second glass substrate, an embossing process is used to extrude the glass with a roller, and the extrusion depth is 40 microns to obtain a second glass substrate with a patterned surface, and the patterned surface is provided with a plurality of spacers. The pattern formed by the protrusions is set, the height of each protrusion is 40 microns, and the cross section of the protrusion is roughly circular. From the fixed end to the free end, the diameter of the cross section of the protrusion decreases gradually, and the fixed end of the protrusion The cross-section of the end is a circle with a side length of 2 mm, the convex cross-section is a circle with a radius of 1 mm, and the thickness of the second glass substrate is 2 mm; on the side of the second glass substrate away from the pattern surface A silicon dioxide antireflection film was formed with a thickness of 100 nm. The second glass substrate is laminated on the second encapsulation adhesive layer, and the pattern surface of the second glass substrate is laminated on the second encapsulation adhesive layer to obtain a semi-finished product.

(6) Heat press the semi-finished product at 140°C to cross-link and polymerize the first adhesive layer and the first encapsulating adhesive layer to obtain a transparent first encapsulating layer, and cross-link and polymerize the second adhesive layer and the second encapsulating adhesive layer A transparent second encapsulation layer having a cavity for accommodating the solar cells is obtained, and the solar photovoltaic module of this embodiment is obtained.

Using the same test method as in Example 1, the short-circuit circuit and output power of the solar photovoltaic module obtained in this example are shown in Table 1.

Comparative example 1

The preparation process of the solar photovoltaic module of Comparative Example 1 is as follows:

(1) Forming a first packaging adhesive layer on the first glass substrate. Wherein, the first glass substrate is a toughened glass plate; the thickness of the first glass substrate is 3 millimeters; the material of the first packaging adhesive layer is uncrosslinked ethylene-vinyl acetate copolymer; the thickness of the first packaging adhesive layer is 0.5 mm.

(2) laying solar cells on the first packaging adhesive layer.

(4) Forming a second encapsulation adhesive layer with a thickness of 0.5 mm on the solar cell sheet, and making the second adhesive layer cover the solar cell sheet, wherein the material of the second encapsulation layer is uncrosslinked ethylene-vinyl acetate copolymer things.

(5) In the forming process of the second glass substrate, an embossing process is used to extrude the glass with a roller, and the extrusion depth is 40 microns to obtain a second glass substrate with a patterned surface, and the patterned surface is provided with a plurality of spacers. A pattern composed of raised protrusions, the height of each protrusion is 40 microns, the cross-section of the protrusions is roughly square, and the edges of the protrusions have rounded corners, from the fixed end to the free end, the cross-section of the protrusions is The side length gradually decreases, the cross section of the raised fixed end is a square with a side length of 2 mm, and the thickness of the second glass substrate is 2 mm; silicon dioxide AR coating. The second glass substrate is laminated on the second encapsulation adhesive layer, and the pattern surface of the second glass substrate is laminated on the second encapsulation adhesive layer to obtain a semi-finished product.

(6) Heat press the semi-finished product at 140° C. to cross-link and polymerize the first encapsulating adhesive layer and the second encapsulating adhesive layer to obtain a transparent second encapsulating layer with a cavity for accommodating solar cells, thereby obtaining a solar photovoltaic module.

Using the same test method as in Example 1, the short-circuit circuit and output power of the solar photovoltaic module obtained in Comparative Example 1 are shown in Table 1.

Table 1 shows the short-circuit circuit and output power of the solar photovoltaic modules of Examples 1-4 and Comparative Example 1.

Table 1

experimental components Short circuit current (A) output power(W) Example 1 8.950 267.468 Example 2 8.949 267.996 Example 3 8.999 267.621 Example 4 8.957 267.553 Comparative example 1 8.883 266.350

It can be seen from Table 1 that the short-circuit current of the solar photovoltaic modules of Examples 1 to 4 is at least 8.949A, and the output power is at least 267.46W, while the short-circuit current and output power of the solar photovoltaic modules of Comparative Example 1 are respectively 8.883 A and 266.350W, obviously, the solar photovoltaic modules of Examples 1-4 have higher short-circuit current and output power, that is, higher optical utilization ratio and conversion efficiency.

The various technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (5)

1. a kind of preparation method of solar photovoltaic assembly, it is characterised in that comprise the steps：

First is formed on the first glass substrate and encapsulates glue-line, wherein, the material of the first encapsulation glue-line is uncrosslinked second Alkene-vinyl acetate co-polymer；

Reflecting layer is provided, and the first adhesive layer and the second adhesive layer is formed with relative two surface in the reflecting layer, by institute State reflective layer to be laminated on the first encapsulation glue-line, and make first adhesive layer and the first packaging plastic layer stackup, its In, the material of first adhesive layer and second adhesive layer is uncrosslinked ethylene-vinyl acetate copolymer, described The reflectance in reflecting layer is more than 60%；

Solar battery sheet is arranged at into the middle part of second adhesive layer；

Second is formed on second adhesive layer and encapsulates glue-line, and make the second encapsulation glue-line shelter state solaode Piece, wherein, the material of the second encapsulation glue-line is uncrosslinked ethylene-vinyl acetate copolymer；

The second glass substrate is provided, second glass substrate has pattern plane, and the pattern plane is provided with and is set by multiple intervals The pattern of the raised composition put, second glass substrate is laminated on the second encapsulation glue-line, and makes second glass The pattern plane of glass substrate and the described second encapsulation layer stackup, obtain semi-finished product；And

By the semi-finished product hot pressing, so that first adhesive layer and the described first encapsulation glue-line cross-linked polymeric form transparent the One encapsulated layer, second adhesive layer are formed with the collecting solar battery sheet with the described second encapsulation glue-line cross-linked polymeric Host cavity the second transparent encapsulated layer, obtain the solar photovoltaic assembly.

2. the preparation method of solar photovoltaic assembly according to claim 1, it is characterised in that be additionally included in the reflection The step of first adhesive layer and second adhesive layer are formed on relative two surface of layer：In the phase in the reflecting layer To two surfaces on coat uncrosslinked ethylene-vinyl acetate copolymer, form first adhesive layer and described second Adhesive layer.

3. the preparation method of solar photovoltaic assembly according to claim 1, it is characterised in that first adhesive layer Thickness is 25 microns～100 microns, and the thickness of second adhesive layer is 25 microns～100 microns.

4. the preparation method of solar photovoltaic assembly according to claim 1, it is characterised in that by second glass Before substrate is laminated in the step on the second encapsulation glue-line, second glass substrate is additionally included in away from the pattern plane Side on formed anti-reflection film the step of.

5. the preparation method of solar photovoltaic assembly according to claim 1, it is characterised in that the first encapsulation glue-line Thickness be 0.45 millimeter～0.6 millimeter；The thickness of the second encapsulation glue-line is 0.45 millimeter～0.6 millimeter.