WO2019223595A1

WO2019223595A1 - Power generation photovoltaic assembly

Info

Publication number: WO2019223595A1
Application number: PCT/CN2019/087214
Authority: WO
Inventors: 段军; 胡德政; 徐希翔; 李沅民
Original assignee: 君泰创新（北京）科技有限公司
Priority date: 2018-05-25
Filing date: 2019-05-16
Publication date: 2019-11-28

Abstract

The present disclosure provides a power generation photovoltaic assembly. The power generation photovoltaic assembly comprises: a power generation solar cell sheet; and a transparent substrate which is stacked on a light receiving surface of the power generation solar cell sheet. A concave-convex structure is formed on a surface of the transparent substrate opposite to the light receiving surface of the power generation solar cell sheet, and the concave-convex structure is configured to collect light incident on said surface onto the light receiving surface of the power generation solar cell sheet.

Description

PV modules for power generation

This application claims the priority and rights of the Chinese patent application filed with the Chinese Patent Office on May 25, 2018, with application number 201810517721.8, and the invention name is "a kind of double-sided power generation photovoltaic module", the entire contents of which are incorporated herein by reference. Applying.

Technical field

The present disclosure relates to the field of photovoltaic power generation technology, and in particular, to a photovoltaic power generation component.

Background technique

At present, solar cells widely used in the market usually have only one surface for receiving light, and the front of the surface is usually covered with flat glass, which is not easily absorbed when the oblique light is irradiated onto the flat glass, which is not conducive to photoelectric conversion efficiency. improve.

Summary of the Invention

According to an aspect of the present disclosure, there is provided a power generation photovoltaic module including: a power generation solar cell; and a transparent substrate stacked on a light receiving surface of the power generation solar cell, wherein the transparent substrate and the A concave-convex structure is formed on a surface opposite to the light-receiving surface of the power-generating solar cell, and the concave-convex structure is configured to collect light radiated onto the surface onto the light-receiving surface of the power-generating solar cell.

In some embodiments, the power generation solar cell is a double-sided power generation solar cell, the transparent substrate includes a first transparent substrate and a second transparent substrate, and the first transparent substrate is stacked on the double-sided power generation solar cell. On one light-receiving surface of the cell sheet, the second transparent substrate is stacked and disposed on the other light-receiving surface of the double-sided power generation solar cell sheet.

In some embodiments, the double-sided power generation solar cell is a heterojunction cell.

In some embodiments, an anti-reflection film layer is formed on a surface of the transparent substrate facing away from the power-generating solar cell.

In some embodiments, the reflectivity of the anti-reflection film layer to light is less than or equal to 1%.

In some embodiments, the concave-convex structure includes an inclined portion that abuts against the surface of the transparent substrate, and an included angle between a plane where the inclined portion is located and the surface of the transparent substrate is greater than 90 degrees .

In some embodiments, the uneven structure includes a plurality of inclined portions that are in contact with the surface of the transparent substrate, and rounded corners are formed between two opposite or adjacent inclined portions.

In some embodiments, the concave-convex structure includes a plurality of convex structures, and a rounded corner is formed between two inclined portions adjacent to each other in the adjacent convex structures.

In some embodiments, the concave-convex structure includes a plurality of strip-shaped convex structures formed on the surface of the transparent substrate.

In some embodiments, the uneven structure includes a plurality of triangular prism-shaped convex structures formed on the surface of the transparent substrate.

In some embodiments, the plurality of triangular prism-shaped convex structures are sequentially arranged along the surface of the transparent substrate, and the plurality of triangular prism-shaped convex structures are sequentially connected along the arrangement direction.

In some embodiments, an angle between two inclined sides of two adjacent triangular prism-shaped convex structures in the plurality of triangular prism-shaped convex structures or each adjacent two of the triangular prism-shaped convex structures is greater than Equal to 90 degrees and less than 180 degrees.

In some embodiments, the uneven structure includes a plurality of dot-like convex structures formed on the surface of the transparent substrate.

In some embodiments, the shape of the dot-shaped raised structure is selected from one or more of a conical shape, a pyramidal shape, and a hemispherical shape.

In some embodiments, the concave-convex structure includes a plurality of convex structures, and each of the convex structures has a height greater than 1 mm.

In some embodiments, the power generation photovoltaic module further includes: a waterproof plastic frame configured to be connected to the transparent substrate to encapsulate a periphery of the power generation solar cell.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present disclosure or the prior art more clearly, the drawings used in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative labor.

FIG. 1 is a schematic structural diagram of a double-sided power generation solar cell according to an embodiment of the present disclosure;

2 is a schematic structural diagram of a single-sided power generation solar cell according to an embodiment of the present disclosure;

3 is a working principle diagram of a double-sided power generation solar cell provided by an embodiment of the present disclosure;

4 is a working principle diagram of a single-sided power generation solar cell provided by an embodiment of the present disclosure;

5 is a schematic structural diagram of a photovoltaic module for power generation according to an embodiment of the present disclosure;

6 is a schematic structural diagram of another photovoltaic power generation module according to an embodiment of the present disclosure;

7 is a schematic structural diagram of a concave-convex structure according to an embodiment of the present disclosure;

8 is a schematic structural diagram of another concave-convex structure according to an embodiment of the present disclosure;

9 is a schematic structural diagram of another uneven structure provided by an embodiment of the present disclosure;

10 is a schematic structural diagram of a triangular prism-shaped convex structure formed on a transparent substrate according to an embodiment of the present disclosure;

11 is a schematic structural diagram of another triangular prism-shaped convex structure formed on a transparent substrate according to an embodiment of the present disclosure;

FIG. 12 is a schematic diagram of reflected light paths of incident light rays at different included angles θ provided by an embodiment of the present disclosure;

13 is a schematic diagram of a refracted light path of incident light rays after passing through convex structures of different heights in a concave-convex structure according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of a HIT battery chip according to an embodiment of the present disclosure; and

FIG. 15 is a schematic structural diagram of an electrical connection of a solar cell for power generation according to an embodiment of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

In the description of this disclosure, it needs to be understood that the terms “center”, “up”, “down”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, The orientations or positional relationships indicated by "top", "bottom", "inside", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply The device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In the description of the present disclosure, unless otherwise stated, "multiple" means two or more.

Some embodiments of the present disclosure provide a power generation solar cell. Referring to FIG. 1, FIG. 1 illustrates a structural diagram of a passively diffused n-PERT (Passivated Emitter, Rear Totally-diffused Cell) of a passivated emitter back surface. The battery is a double-sided power generation solar cell sheet, and includes: a metal electrode 01, a front surface antireflection film 02, a boron doped emitter 03, an n-type silicon 04, a phosphorus doped back field 05, and a back antireflection. Film 06 and back electrode 07. FIG. 2 provides a schematic structural diagram of a single-sided power generation solar cell. The single-sided power generation solar cell includes: a metal electrode 01, a front surface antireflection film 02, a boron-doped emitter 03, and an n-type silicon 04. , Phosphorus-doped back field 05, back anti-reflection film 06, and back electrode 07, and the back electrode 07 is covered with all metal on one side of the back anti-reflection film 06. The difference between n-PERT double-sided solar cells and single-sided solar cells is mainly due to the difference in the back structure. The back of the double-sided solar cells uses high-transmission SiNx as a passivation anti-reflection film, and metal electrodes on the back. Same as the area of the front metal electrode, which accounts for 3% of the area of the battery sheet; and the back electrode 07 of the single-sided power generation solar cell is covered with all metal.

3 and 4 are schematic diagrams of power generation principles of a double-sided power generation solar cell and a single-sided power generation solar cell, respectively. As shown in Figure 3, when the sun shines on the n-PERT double-sided power generation solar cell, part of the light is reflected by the surrounding environment and hits the back of the n-PERT double-sided power generation solar cell. This part of the light can pass through Through the SiNx material, the excited electron-hole pairs are absorbed by the silicon and separated by the n + -n junctions, which contributes to the photocurrent and efficiency of the battery. As shown in Figure 4, the back surface of a single-sided power generation solar cell is completely covered by a metal electrode. The thickness of the metal electrode is usually 10 μm. Light cannot penetrate the back metal electrode and absorbed by silicon. Therefore, the single-sided power generation solar cell is almost unusable. Under the condition that the backside of the battery is not zero, the light emitted from the back surface into the battery has higher power generation efficiency than the single-sided power generation solar cell.

However, in some embodiments, the front and back surfaces of the double-sided power generation solar cell are made of flat glass, and in some embodiments, the front surface of the single-sided power generation solar cell is also made of flat glass, which causes oblique light to illuminate the flat glass. It is not easy to be absorbed, which is not conducive to the improvement of photoelectric conversion efficiency.

An embodiment of the present disclosure provides a power generation photovoltaic module. Referring to FIGS. 5 and 6, the power generation photovoltaic module includes: a power generation solar cell sheet 1 and a transparent substrate laminated on a light receiving surface of the power generation solar cell sheet 1; A concave-convex structure 4 is formed on a surface of the transparent substrate opposite to the light-receiving surface of the power-generating solar cell 1. The uneven structure 4 is configured to irradiate the surface of the transparent substrate that is opposite to the light-receiving surface of the power-generating solar cell 1. Of incident light is collected on the light-receiving surface of the power-generating solar cell sheet 1.

The light-receiving surface of the power-generating solar cell 1 refers to a surface for receiving light and converting light into electricity after receiving the light, and is generally a surface used for power generation in the power-generating solar cell 1. The power-generating solar cell referred to in this disclosure The light-receiving surface of the cell sheet 1 refers to a surface facing the transparent substrate.

When the light incident from the light source passes through the concave-convex structure 4, compared with the light when it passes through the planar structure, the light originally emitted in all directions under the reflection of the concave-convex structure 4 is controlled to a certain level after passing through the concave-convex structure 4. Within the angle range, the effect of condensing can be achieved.

An embodiment of the present disclosure provides a photovoltaic power generation module. By forming a concave-convex structure 4 on the transparent substrate, the concave-convex structure 4 can effectively change the path of light. Therefore, by appropriately setting the concave-convex structure 4, compared with a planar structure The oblique light passing through the transparent substrate can be collected on the light-receiving surface of the power-generating solar cell sheet 1 to reduce light loss, thereby increasing the light absorption of the power-generating solar cell sheet 1 and further improving power generation efficiency.

The transparent substrate may be ultra-white glass. Ultra-white glass is a kind of ultra-transparent low-iron glass, also called low-iron glass or high-transparent glass. It is a new type of high-quality glass with high quality and multiple functions, and the light transmittance can reach more than 91.5%, which can effectively increase the light absorption of the solar cell 1 for power generation. The transparent substrate may be an AR-coated glass. AR coated glass is a kind of glass with special treatment on the glass surface.

In some embodiments, referring to FIG. 5 and FIG. 2, the power generation solar cell 1 in the power generation photovoltaic module is a single-sided power generation solar cell. The single-sided power generation solar cell has only one light receiving surface, and the transparent substrate is The first transparent substrate 2 is disposed on the light-receiving surface side of the single-sided power generation solar cell sheet, and the uneven structure 4 is disposed on the first transparent substrate 2 opposite to the single-sided power generation solar cell sheet. Side of the light receiving surface.

In some embodiments, referring to FIG. 6 and FIG. 1, the power generation solar cell 1 in the power generation photovoltaic module is a double-sided power generation solar cell. The double-sided power generation solar cell has two light receiving surfaces, and the transparent substrate is A first transparent substrate 2 and a second transparent substrate 3, the first transparent substrate 2 is disposed on one light-receiving surface of the double-sided power generation solar cell sheet, and the second transparent substrate 3 is disposed on another of the double-sided power generation solar cell sheet One light-receiving surface, and the concave-convex structure 4 are respectively disposed on one side of the first transparent substrate 2 and the second transparent substrate 3 opposite to the light-receiving surface of the double-sided power generation solar cell sheet. In some embodiments of the present disclosure, an anti-reflection film layer 5 is formed on a surface of the transparent substrate facing away from the power-generating solar cell sheet 1. By subjecting the surface of the transparent substrate to surface treatment and forming the antireflection film layer 5 on the surface, the light transmittance can be further increased, and the light absorption of the power generation solar cell sheet 1 can be further increased.

Exemplarily, the reflectivity of the antireflection film layer 5 to light is less than or equal to 1%. In this way, the visible light transmittance peak value can reach 99%, which can greatly increase the light transmittance and reduce energy consumption.

The specific structure of the power-generating solar cell sheet 1 is not limited as long as it can realize photoelectric conversion.

In some embodiments of the present disclosure, the power generation solar cell 1 may be a heterojunction cell, and the heterojunction cell may be a double-sided power generation solar cell, such as a HIT (Heterojunction with intrinsic Thinlayer) cell. As shown in FIG. 14, the HIT cell provided in this embodiment has the following structure: between the P-type silicon doped layer 13 and the crystalline silicon substrate 11, and between the N-type silicon doped layer 14 and the crystalline silicon substrate 11 A non-doped (intrinsic) silicon thin film 12 is provided, a transparent conductive film 15 is deposited on the N-type silicon doped layer 14 and the P-type silicon doped layer 13 respectively, and finally the N-type silicon is doped. A gate line electrode 16 is disposed on the impurity layer 14 and the P-type silicon doped layer 13. The HIT cell with this structure changes the performance of the cell, and can improve the photoelectric conversion efficiency and open circuit voltage by absorbing light energy on both sides.

For example, the undoped (intrinsic) silicon thin film 12 may be one of an intrinsic amorphous silicon thin film layer or an intrinsic microcrystalline silicon thin film layer, such as a hydrogenated amorphous silicon thin film layer; an N-type silicon doped layer 14 may be one of an N-type doped amorphous silicon layer or an N-type doped microcrystalline silicon layer, for example, an N-type hydrogenated amorphous silicon layer; the P-type silicon doped layer 13 may be a P-type doped non-silicon layer. One of a crystalline silicon layer or a P-type doped microcrystalline silicon layer, for example, a P-type hydrogenated amorphous silicon layer; the transparent conductive film 15 may be indium oxide, titanium-doped indium oxide, tungsten oxide, boron-doped zinc oxide, etc. One of transparent conductive oxides.

The specific structure of the concave-convex structure 4 is not limited, as long as the oblique light can be collected and the light absorption of the power-generating solar cell sheet 1 can be increased.

In some embodiments, in order to increase the light absorption of the solar cell 1 for generating electricity, referring to FIG. 7, the uneven structure 4 includes an inclined portion A that is in contact with the surface of the transparent substrate. The angle α between the surfaces of the transparent substrate is greater than 90 degrees, and the inclined portion A may be a flat surface or a curved surface. If the inclined portion A is a curved surface, a point in the curved surface near the surface of the transparent substrate is located The included angle α between the tangent plane of and the surface of the transparent substrate is greater than 90 degrees.

In order to further increase the light absorption of the solar cell 1 for generating electricity, referring to FIG. 7, the uneven structure 4 includes a plurality of inclined portions A that are in contact with the surface of the transparent substrate. Forming a rounded corner B, the rounded corner B can increase diffuse reflection of light, so as to reflect more light to the light receiving surface of the solar cell 1 for power generation.

In some embodiments, referring to FIG. 8, the concave-convex structure 4 includes a plurality of convex structures, and a rounded corner is formed between two inclined portions adjacent to each other in the adjacent convex structures. Similarly, the rounded corners can be used to increase diffuse reflection of light, reduce light energy loss, and increase the light absorption of the solar cell 1 for power generation.

Exemplarily, the uneven structure 4 may be a wavy structure as shown in FIG. 8.

Exemplarily, the uneven structure 4 may also include a plurality of dot-shaped convex structures formed on the surface of the transparent substrate. For another example, the dot-shaped convex structures may be conical, pyramidal, or hemispherical. Combination of one or more of them can also be other structures, such as a circular table structure. For example, the uneven structure 4 is formed of pyramid-shaped protrusions formed on a plane at intervals as shown in FIG. 9.

In some embodiments, the concave-convex structure 4 includes a plurality of strip-shaped convex structures formed on the surface of the transparent substrate, and the cross-section of the strip-shaped convex structures may be trapezoidal, circular, arc-shaped, or Other strip-shaped raised structures.

In some embodiments of the present disclosure, referring to FIG. 5, FIG. 6, FIG. 10, and FIG. 11, the uneven structure 4 includes a plurality of triangular prism-shaped convex structures 41 formed on the surface of the first transparent substrate 2, and formed on the first transparent substrate 2. A plurality of triangular prism-shaped protruding structures 42 on the surface of the second transparent substrate 3.

In the embodiment of the present disclosure, by forming a plurality of triangular prism-shaped convex structures (41 and 42) on the surfaces of the first transparent substrate 2 and the second transparent substrate 3, as shown in FIG. One side b is located on the surface of the first transparent substrate 2, the other two sides b are inclined upward and intersect, and the two inclined sides b of the triangular prism serve as reflecting surfaces, which can collect oblique light on the first transparent substrate. 2 On the oppositely disposed power generating solar cell sheet 1, similar to the first transparent substrate 2, a plurality of triangular prism-shaped protruding structures 42 formed on the second transparent substrate 3 can also collect oblique light on the second transparent substrate. The substrate 3 is disposed on the power-generating solar cell sheet 1 so as to effectively increase the light absorption of the power-generating solar cell sheet 1.

The specific process of forming a plurality of triangular prism-shaped convex structures (41 and 42) on the surfaces of the first transparent substrate 2 and the second transparent substrate 3 is not limited.

Exemplarily, the plurality of triangular prism-shaped convex structures (41 and 42) may be formed by slotting the surfaces of the first transparent substrate 2 and the second transparent substrate 3, respectively. One side b is respectively connected to the surfaces (planes) of the first transparent substrate 2 and the second transparent substrate 3 to form a plurality of triangular prism-shaped protrusions on the surfaces of the first transparent substrate 2 and the second transparent substrate 3, respectively. Structure (41 and 42).

The arrangement of the plurality of triangular prism-shaped convex structures (41 and 42) formed on the surfaces of the first transparent substrate 2 and the second transparent substrate 3 is not limited.

In some embodiments of the present disclosure, referring to FIG. 5, FIG. 6, FIG. 10, and FIG. 11, a plurality of triangular prism-shaped protrusion structures 41 formed on the surface of the first transparent substrate 2 are sequentially arranged along the surface of the first transparent substrate 2. A plurality of triangular prism-shaped convex structures 42 formed on the surface of the second transparent substrate 3 are sequentially arranged along the surface of the second transparent substrate 3, and a plurality of triangular prism-shaped convex structures 41 formed on the surface of the first transparent substrate 2 and The plurality of triangular prism-shaped convex structures 42 formed on the surface of the second transparent substrate 3 are sequentially connected along the arrangement direction. That is, when one side b of a plurality of independent triangular prisms is connected to the surface of the first transparent substrate 2 or the second transparent substrate 3, a plurality of surfaces are formed on the surfaces of the first transparent substrate 2 and the second transparent substrate 3. In the case of three triangular prism-shaped convex structures (41 and 42), the bottom edges of two inclined sides b adjacent to each other of two adjacent triangular prisms intersect. When grooves are formed on the surfaces of the first transparent substrate 2 and the second transparent substrate 3 to form the plurality of triangular prism-shaped convex structures (41 and 42), the cross-sectional shape of the grooves may be V-shaped. In this way, the oblique light irradiated to the respective positions on the first transparent substrate 2 and the second transparent substrate 3 can be collected on the power generation solar cell sheet 1, thereby maximizing the light absorption of the power generation solar cell sheet 1.

Exemplarily, grooves are formed on the surfaces of the first transparent substrate 2 and the second transparent substrate 3, respectively, to form a plurality of triangular prism-shaped convex structures (41 and 42). The first transparent substrate 2 and the plurality of triangular prism-shaped convex structures 41 formed on the surface of the first transparent substrate 2 are an integrated structure. The second transparent substrate 3 and the plurality of three prisms formed on the surface of the second transparent substrate 3 are integrated. The prism-shaped convex structure 42 is an integrated structure, which can avoid the connection of one side b of the independent triangular prism with the first transparent substrate 2 or the second transparent substrate 3, respectively. If the connection is not good, it is easy to form a reflective surface, which makes the light transmittance. Reduced situations occur.

In order to further improve the light condensing ability of the triangular prism-shaped convex structures (41 and 42), the two inclined sides b in each triangular prism-shaped convex structures (41 and 42) are polished to form a reflective mirror surface. When light is emitted from the two inclined sides b of each triangular prism-shaped convex structure (41 and 42), when the emitted light is irradiated to the adjacent side b, the light can be maximized due to the principle of specular reflection Reflected on the solar cell 1 for power generation, thereby facilitating the absorption of light by the solar cell 1 for power generation.

The angle θ between two inclined and close sides b of each of two adjacent triangular prism-shaped convex structures in the plurality of triangular prism-shaped convex structures (41 and 42) is not limited.

In some embodiments of the present disclosure, referring to FIG. 10, FIG. 11, and FIG. 12, a plurality of triangular prism-shaped convex structures (41 and 42) are partially adjacent to each other or each adjacent two of the triangular prism-shaped convex structures (41 and 42). The angle θ between the two sides b which are inclined and close to each other is more than 90 degrees and less than 180 degrees. When light is emitted from the two inclined sides b of each triangular prism-shaped convex structure, the larger the included angle θ, the fewer the number of reflections, which can reduce the light energy loss and increase the light absorption of the solar cell 1 for power generation.

In order to prevent the included angle θ from being too large and affecting the light condensing effect, for example, in the plurality of triangular prism-shaped convex structures (41 and 42), two or three adjacent prism-shaped convex structures are adjacent to each other. The angle θ between the two inclined side surfaces b that are close to each other is greater than 90 degrees and less than or equal to 140 degrees, such as 91-140 degrees.

In still other embodiments of the present disclosure, referring to FIG. 13, the concave-convex structure 4 includes a plurality of convex structures, wherein a height h of each of the convex structures is greater than 1 mm. Taking the uneven structure 4 as a plurality of triangular prism-shaped convex structures (41 and 42) formed on the surface of the first transparent substrate 2 or the second transparent substrate 3 as an example, the convex structure here is a triangular prism convex structure. . The height h of the triangular prism-shaped convex structure 41 formed on the first transparent substrate 2 is equal to the height value of the triangular cross-section of the triangular prism-shaped convex structure. The height h is equal to the height of the triangular section of the triangular prism-shaped convex structure. When V-shaped grooves are formed in the first transparent substrate 2 and the second transparent substrate 3 to form a triangular prism-shaped convex structure, the height of each triangular prism-shaped convex structure (41 and 42) is equal to the groove depth of the V-shaped groove. . As shown in FIG. 13, without considering the transmittance of the triangular prism-like convex structures (41 and 42), the higher the height, the easier it is for incident light to collect on the solar cell 1 for power generation.

In yet another embodiment of the present disclosure, referring to FIGS. 5 and 6, an encapsulating adhesive film 6 is further provided between the first transparent substrate 2 and the second transparent substrate 3 and the power-generating solar cell sheet 1. When the power generation solar cell 1 is a single-sided power generation solar cell, the first transparent substrate 2 can be connected to the single-sided power generation solar cell through the encapsulating adhesive film 6; when the power generation solar cell 1 is a double-sided power generation solar cell The first transparent substrate 2, the double-sided power generating solar cell sheet, and the second transparent substrate 3 can be connected through the encapsulating film 6.

The encapsulating film is preferably an EVA (Polyethylene vinyl acetate) film, a PVB (PolyVinyl Butyral Film), or a POE (Polyolefin Elastomer). ) Adhesive film. EVA film has the advantages of low melting point, good fluidity, high transparency and mature lamination process. Compared with EVA film, PVB has higher safety, simple formula, longer shelf life and better stability. POE is an ethylene-octane copolymer. It is a new type of polyolefin thermoplastic elastomer with narrow relative molecular mass distribution, narrow comonomer distribution, and controllable structure developed with metallocene as a catalyst. The biggest advantage of POE film is the low water vapor transmission rate and high volume resistivity, which ensure the safety and long-term aging resistance of the module in high temperature and high humidity environment, so that the module can be used for a long time.

In another embodiment of the present disclosure, referring to FIG. 5 and FIG. 6, the power generation photovoltaic module further includes a waterproof rubber frame 7. When the power generation solar cell 1 is a single-sided power generation solar cell, the waterproof rubber frame 7 is used to connect the A transparent substrate 2 and a solar cell are generated, and the periphery of the single-sided solar cell is encapsulated. When the power generation solar cell 1 is a double-sided power generation solar cell, a waterproof rubber frame 7 is used to connect the first transparent substrate 2 and the second transparent substrate 3 to encapsulate the periphery of the double-sided power generation solar cell.

In the embodiment of the present disclosure, by encapsulating the waterproof rubber frame around the periphery of the photovoltaic power generation module, the waterproof performance can be improved, and the occurrence of the potential-induced attenuation effect can be avoided.

Exemplarily, the waterproof plastic frame 7 may be formed by applying waterproof glue between the first transparent substrate 2 and the second transparent substrate 3 at the peripheral position of the double-sided photovoltaic power generation module, or it may be wrapped around the double-sided photovoltaic power generation The periphery of the module is connected to the waterproof tape of the first transparent substrate 2 and the second transparent substrate 3.

The waterproof glue may be butyl glue, and the waterproof tape may be butyl tape.

In still other embodiments of the present disclosure, referring to FIG. 15, the plurality of power generating solar cells 1 are arranged in an array, and the plurality of power generating solar cells 1 are sequentially located in the same row. The power generating solar cell groups 8 are connected in series, and the power generating solar cell groups 8 of each group are connected in parallel through a bus bar 9 and output.

Among them, the current output terminal is usually led out from the back of the photovoltaic module through a lead wire, and is connected to the junction box.

In the embodiment of the present disclosure, by connecting a plurality of power generating solar cells 1 in series to form a high current, and then connecting each group of power generating solar cell groups 8 in parallel through a bus bar to output a high voltage, the load capacity can be improved.

Wherein, the plurality of power generating solar cells 1 in the same row in the same row can be connected in sequence through photovoltaic welding tapes 10. Photovoltaic welding tape, also known as tinned copper tape or tinned copper tape, is used in the connection between photovoltaic module cells and plays an important role in conducting electricity.

The above are only specific implementations of the present disclosure, but the scope of protection of the present disclosure is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present disclosure. It should be covered by the protection scope of this disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

A photovoltaic power generation module includes:

Generating solar cells; and

A transparent substrate stacked on a light receiving surface of the power generating solar cell sheet,

Wherein, a concave-convex structure is formed on a surface of the transparent substrate opposite to the light-receiving surface of the power-generating solar cell sheet, and the concave-convex structure is configured to collect light irradiated onto the surface to the power-generating solar cell. The light receiving surface of the sheet.
The power generation photovoltaic module according to claim 1, wherein:

The power-generating solar cell is a double-sided power-generating solar cell. The transparent substrate includes a first transparent substrate and a second transparent substrate. The first transparent substrate is stacked on one light-receiving surface of the double-sided power-generating solar cell. On the other hand, the second transparent substrate is stacked and disposed on the other light receiving surface of the double-sided power generating solar cell.
The power generation photovoltaic module according to claim 2, wherein:

The double-sided power generation solar cell is a heterojunction cell.
The photovoltaic power generation module according to claim 1 or 2, wherein:

An anti-reflection film layer is formed on a surface of the transparent substrate facing away from the power-generating solar cell sheet.
The power generation photovoltaic module according to claim 4, wherein:

The reflectivity of the anti-reflection film layer to light is less than or equal to 1%.
The photovoltaic power generation module according to claim 1 or 2, wherein:

The uneven structure includes an inclined portion that abuts against the surface of the transparent substrate, and an included angle between a plane where the inclined portion is located and the surface of the transparent substrate is greater than 90 degrees.
The photovoltaic power generation module according to claim 1 or 2, wherein:

The uneven structure includes a plurality of inclined portions that abut against the surface of the transparent substrate, and rounded corners are formed between two opposite or adjacent inclined portions.
The power generation photovoltaic module according to claim 7, wherein:

The concave-convex structure includes a plurality of convex structures, and two adjacent inclined structures in two adjacent convex structures form a rounded corner.
The photovoltaic power generation module according to claim 1 or 2, wherein:

The uneven structure includes a plurality of strip-shaped convex structures formed on the surface of the transparent substrate.
The photovoltaic power generation module according to claim 9, wherein:

The uneven structure includes a plurality of triangular prism-shaped convex structures formed on the surface of the transparent substrate.
The photovoltaic power generation module according to claim 10, wherein:

The plurality of triangular prism-shaped convex structures are sequentially arranged along the surface of the transparent substrate, and

The plurality of triangular prism-shaped convex structures are sequentially connected along the arrangement direction.
The power generation photovoltaic module according to claim 11, wherein:

An included angle between two adjacent two sides of the plurality of triangular prism-shaped convex structures or between two inclined sides adjacent to each other in the two adjacent triangular prism-shaped convex structures is greater than 90 degrees and less than 180 degrees.
The photovoltaic power generation module according to claim 1 or 2, wherein:

The uneven structure includes a plurality of dot-like convex structures formed on the surface of the transparent substrate.
The power generation photovoltaic module according to claim 13, wherein:

The shape of the dot-shaped raised structure is selected from one or more of a conical shape, a pyramidal shape, and a hemispherical shape.
The photovoltaic power generation module according to claim 1 or 2, wherein:

The concave-convex structure includes a plurality of raised structures, each of which has a height greater than 1 mm.
The photovoltaic power generation module according to claim 1 or 2, further comprising:

The waterproof plastic frame is configured to be connected to the transparent substrate to encapsulate the periphery of the power generating solar cell sheet.