CN102203641A - Functional sheet and solar cell module including same - Google Patents

Abstract

The present invention relates to a functional board and a solar cell assembly comprising the functional board. More specifically, the solar cell assembly of the present invention is characterized in that it includes: a solar cell; glass attached to the front of the solar cell; And a back sheet, which is attached to the back of the above-mentioned solar battery sheet and has a reflective film. In particular, the back sheet includes: a base film, and a reflective film formed on the base film; light transmitted through the glass is reflected by the reflective film, and then concentrated toward the solar battery sheet. The solar cell assembly of the present invention uses a functional plate with excellent heat resistance, durability, chemical resistance, moisture resistance and insulation performance and excellent reflection effect as a back sheet, thereby increasing the incident amount of sunlight and improving the performance of the solar cell. efficiency.

Description

Functional board and solar battery module containing the functional board

technical field

The present invention relates to a functional board and a solar cell module comprising the functional board, more specifically, to a functional board with excellent heat resistance, durability, chemical resistance, moisture resistance and insulation performance and excellent reflection effect Used as a back sheet to increase the incident amount of sunlight and improve the efficiency of solar cells and the solar cell module including the functional board.

Background technique

Recently, due to the pollution of the global environment and the depletion of fossil energy, the development of environmentally friendly alternative energy and the diversification of future energy have become international issues. Against this background, solar cells utilizing solar energy are attracting attention as a powerful future alternative energy source, and the scale of the related world market is rapidly increasing as solar cells become cheaper.

The smallest unit of this kind of solar cell is called a cell. In fact, solar cells are hardly used in the form of cells. Compared with the voltage required for actual use from a few V to tens or hundreds of V, a single The voltage released by the battery sheet is about 0.5V, which is very small, so multiple unit solar cells are used in series or in parallel with the required unit capacity.

In addition, since solar cells are exposed to various harsh environments when they are used in the wild, in order to protect multiple cells connected with a required unit capacity from the harsh environment, a plurality of cells are formed into a packaged solar cell panel (solar cell panel) and use.

Such solar panels are used to supply stable power to structures such as buildings.

On the other hand, since the principle of the solar panel is to absorb sunlight to generate electricity, the electricity generated depends on the incident amount of sunlight.

Conventionally, additional components (convex lenses, etc.) have been used to increase the amount of sunlight incident on solar panels, but such components have problems of being difficult to apply directly to solar panels in terms of cost and appearance.

Contents of the invention

The present invention is proposed to solve the above-mentioned problems, and its purpose is to provide a back sheet that is excellent in heat resistance, durability, chemical resistance, moisture resistance, and insulation performance and has an excellent reflection effect and can increase the incidence of sunlight. Amount of solar cell modules that can improve the efficiency of solar cells.

Moreover, another object of the present invention is to provide a method that reflects light in the infrared wavelength range so that it cannot be incident on the solar cell sheet, and transmits light in the following wavelength range to be incident on the solar cell sheet, thereby suppressing The temperature of the solar cell rises, and the solar cell module can improve the power generation efficiency.

The present invention provides a functional board in order to achieve the above object.

According to an embodiment of the present invention, the above-mentioned functional board includes: a base film; and a reflective film formed on the above-mentioned base film.

At this time, the substrate film may be made of polyvinyl fluoride (poly vinyl fluoride: PVF), polyethylene terephthalate (polyethylene terephthalate: PET) and ethylene tetrafluoroethylene copolymer (ethylene tetrafluoroethylene: More than one kind of the group consisting of ETFE).

In this case, a plurality of irregularities may be formed on the surface of the reflective film, and these irregularities may have a triangular prism structure.

According to another embodiment of the present invention, a solar cell module is provided, the solar cell module includes: a solar cell; glass, which is attached to the front of the solar cell; and a back sheet, which is attached to the solar cell rear, and has a reflective film.

In this case, in the solar cell module according to another embodiment of the present invention, the light transmitted through the above-mentioned glass is reflected by the reflective film, and then concentrated on the solar cell sheet.

According to yet another embodiment of the present invention, a solar cell assembly is provided, the solar cell assembly includes: a solar cell; glass, which is attached to the front of the solar cell; an infrared reflective film, which is arranged on the solar cell and the solar cell between the glass; and a back sheet, which is attached to the back of the above-mentioned solar cells and has a reflective film.

In this case, a plurality of irregularities may be formed on the surface of the reflective film, and the irregularities may have a triangular prism structure.

According to another embodiment of the present invention, there is provided a solar cell assembly, the solar cell assembly includes: a solar cell; glass, which is attached to the front of the solar cell; a back sheet, which is attached to the back of the solar cell , and has a reflection film; and a refraction film, which is arranged between the solar cell sheet and the back plate.

In this case, a plurality of irregularities may be formed on the surface of the reflective film, and the irregularities may have a triangular prism structure.

As described above, the solar cell module of the present invention uses a back sheet that is excellent in heat resistance, durability, chemical resistance, moisture resistance, and insulation performance and has an excellent reflection effect, thereby increasing the amount of sunlight incident on the solar cell sheet, while The efficiency of solar cell modules can be improved.

Moreover, since the solar cell module of the present invention reflects light in the infrared wavelength range so that it cannot be incident on the solar cell sheet, and transmits light in the following wavelength range to be incident on the solar cell sheet, the solar cell sheet is suppressed. As the temperature rises, the power generation efficiency can be improved.

Description of drawings

Fig. 1 is a top view of the solar cell module of the present invention.

Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1 according to the first embodiment of the present invention.

3 to 5 are various structural views of the back sheet constituting the solar cell module of the present invention.

Fig. 6 is a conceptual diagram showing the process of concentrating light in the solar cell module according to the first embodiment of the present invention.

Fig. 7 is a sectional view taken along line A-A of Fig. 1 according to a second embodiment of the present invention.

8 to 10 are conceptual diagrams showing the process of concentrating light in the solar cell module according to the second embodiment of the present invention.

Detailed ways

Next, the function board of the embodiment of the present invention will be described in detail.

A functional board according to an embodiment of the present invention includes: a base film; and a reflective film formed on the base film.

Here, the base film may be formed of a material excellent in heat resistance, durability, chemical resistance, moisture resistance, and insulation performance, but is not limited thereto. For example, it can be selected from the group consisting of polyvinylfluoride (polyvinylfluoride: PVF), polyethylene terephthalate (polyethylene terephthalate: PET) and ethylene-tetrafluoroethylene copolymer (ethylene tetrafluoroethylene: ETFE). One kind or two or more kinds are stacked to form a multilayer structure.

On the other hand, a plurality of concavities and convexities may be formed on the surface of the reflective film, but is not limited thereto. For example, the concavities and convexities may have a polygonal column or polygonal pyramid structure, but especially preferably have a triangular prism structure.

At this time, the reflective film constituting the functional board of the embodiment of the present invention can refract and reflect light incident on the triangular prism protruding from its surface, and the reflection efficiency can be further improved by adjusting the reflection angle.

Moreover, the functional plate of the embodiment of the present invention may also include a silicon oxide layer or an undercoat layer disposed between the above-mentioned base film and the reflective film, and inserting the layer between the above-mentioned base film and the reflective film can improve Adhesion of substrate film and reflective film.

Hereinafter, a solar cell module including the above-mentioned functional board will be described in detail with reference to the accompanying drawings. The accompanying drawings are used to show the embodiments of the present invention, and are only used to describe the present invention in more detail, and are not intended to limit the technical scope of the present invention.

Fig. 1 is a top view of the solar cell assembly of the present invention; Fig. 2 is a cross-sectional view of the A-A line of Fig. 1 of the first embodiment of the present invention; Fig. 3 to Fig. 5 are various structural views of the back plate constituting the solar cell assembly of the present invention; Fig. 6 is a conceptual diagram showing the process of concentrating light in the solar cell module according to the first embodiment of the present invention. The drawings of the present application are shown for the convenience of description, and the shape of each layer (layer) and each component shown in the drawings can be enlarged or reduced for the convenience of description.

The solar cell module 10 of the first embodiment of the present invention comprises: a solar cell 13; a glass 15 attached to the front of the solar cell 13; and a back sheet 20 attached to the back of the solar cell 13 and having reflective film 21.

Here, the term "front side" of the solar battery sheet refers to a surface corresponding to sunlight among one surface of the solar battery sheet, and the term "later surface" refers to a surface corresponding to a structure or the like.

Unexplained reference numeral 14 denotes an adhesive film (such as an EVA film), reference numeral 11 denotes a bracket combined with an edge portion of a solar cell module including solar cell sheets, glass and a back sheet, and reference numeral 12 denotes an elastic pad .

On the other hand, the back sheet 20 constituting the solar cell module 10 of the first embodiment of the present invention is the same as the functional sheet described above.

Referring to FIGS. 3 to 5 , the backplane includes base films 22 , 32 , 42 and reflective films formed on the base films.

As mentioned above, the base film may be made of a material with excellent heat resistance, durability, chemical resistance, moisture resistance and insulation performance, but is not limited thereto. For example, it can be selected from the group consisting of polyvinylfluoride (polyvinylfluoride: PVF), polyethylene terephthalate (polyethylene terephthalate: PET) and ethylene-tetrafluoroethylene copolymer (ethylene tetrafluoroethylene: ETFE). One kind or two or more kinds are stacked to form a multilayer structure.

Moreover, the backplane 20 may further include a silicon oxide layer or an undercoat layer arranged between the aforementioned base film and the reflective film.

As an example of various implementations of the back sheet, Fig. 3 shows substrate films with PVF 23, PET 24, PVF 23 stacked from bottom to top, and Fig. 4 shows ETEE 34 stacked from bottom to top. And the substrate film of silicon oxide layer 33, Fig. 5 shows the substrate film that is laminated with PET 44 and primer layer 43, but the present invention is not limited thereto, can carry out multiple lamination, so that have excellent heat resistance Durability, chemical resistance, moisture resistance and insulation properties.

Furthermore, as described above, the reflective films 21, 31, 41 can refract and reflect the light incident on the triangular prisms protrudingly formed on the surface, and the reflection efficiency can be further improved by adjusting the reflection angle.

As shown in Fig. 6, a part of the sunlight passing through the front glass 15 constituting the solar cell assembly is concentrated toward the solar cell sheet 13, while the remaining part is directed toward the back plate 20. The sunlight reflected by the film 21 is concentrated to the solar battery sheet 13 again, thereby improving the efficiency of the solar battery module.

Furthermore, the reflective film 21 can refract and reflect light incident on the triangular prism protrudingly formed on its surface, and the reflective efficiency can be further improved by adjusting the reflective angle.

Next, a second embodiment of the present invention will be described in detail below with reference to FIGS. 7 to 10 . 7 is a cross-sectional view of the line A-A of FIG. 1 according to the second embodiment of the present invention; FIGS. 8 to 10 are conceptual diagrams showing the light concentrating process of the solar cell module according to the second embodiment of the present invention. In FIGS. 8 to 10 , the same configurations as those of the above-mentioned first embodiment are assigned the symbols of the first embodiment plus 100.

The solar cell assembly 110 of the second embodiment of the present invention comprises: a solar cell 113; a glass 115 attached to the front of the solar cell 113; and a back sheet 120 attached to the back of the solar cell 113 and having reflective film 121.

Moreover, the solar cell module 110 further includes an infrared reflective film 130 disposed between the solar cell sheet 113 and the glass 115 .

Moreover, the solar cell module 110 of the second embodiment of the present invention may further include a refraction film 140 disposed between the solar cell sheet 113 and the back plate 120 . Here, the term of the front of the solar battery sheet 113 refers to the surface corresponding to the incident direction of sunlight among one surface of the solar battery sheet 13, and the term of the latter refers to the surface corresponding to the structure or the like on which the solar battery module 110 is installed. The corresponding face of the wall.

Unexplained reference numeral 114 represents an adhesive film (such as an EVA film), reference numeral 111 represents a bracket combined with the edge of the solar cell module 110 including the solar cell sheet 113, glass 115 and back plate 120, and the reference numeral 112 represents an elastic pad.

On the other hand, the back sheet 120 constituting the solar cell module 110 of the second embodiment of the present invention is the same as that shown in FIGS. 3 to 5 , and the related description refers to the first embodiment.

And, the surface of the reflective film 121 that constitutes the solar cell module 110 according to an embodiment of the present invention can form concavities and convexities with various shapes and structures, for example, the above-mentioned concavo-convexes can be formed into convexly formed triangular prisms, so that the incident light is refracted , reflection, and can form a triangular prism at various angles to adjust the reflection angle, thereby further improving the reflection efficiency.

The trace of sunlight on the solar cell module 110 configured as above will be described in detail with reference to the drawings.

As shown in Fig. 8, among the sunlight passing through the front glass 115 constituting the solar cell module, light in the infrared wavelength range is reflected toward the glass by the infrared reflective film 130, and only the wavelengths in the following range pass through the infrared reflective film 130. Since it enters the solar battery sheet 113 afterward, the temperature rise of the solar battery sheet caused by infrared rays can be suppressed, and power generation efficiency can be improved.

As shown in FIG. 9 , part of the sunlight passing through the glass 115 constituting the front of the solar cell module is concentrated toward the solar cell sheet 113 , while the rest is directed toward the back plate 120 . At this time, since the sunlight incident on the back plate 120 passes through the refraction film 140, the angle of the incident light changes, so the re-reflection of the solar cell sheet 113 based on the back plate 120 can be easily performed, thereby improving the performance of the solar cell. The power generation efficiency of the module 110.

As shown in FIG. 10 , part of the sunlight passing through the glass 115 constituting the front of the solar cell module is concentrated toward the solar cell sheet 113 , while the rest is emitted toward the back plate 120 . At this time, since the sunlight reflected by the reflective film 121 of the back plate can be concentrated on the solar battery sheet 113 again, the efficiency of the solar battery module can be improved.

Furthermore, the reflective film 121 can refract and reflect light incident on the triangular prism protrudingly formed on its surface, and the reflection efficiency can be further improved by adjusting the reflection angle.

The above-mentioned embodiments of the present invention are disclosed for illustration. For those skilled in the art, various modifications, changes and additions can be made without departing from the spirit and scope of the present invention. These amendments, changes and additions should be deemed to belong to the protection scope of the present invention.

For example, the solar cell module 110 of another embodiment of the present invention may include: a solar cell sheet 113; glass 115, which is attached to the front of the solar cell sheet; a back sheet 120, which is attached to the back of the above-mentioned solar cell sheet, and It has a reflection film; and a refraction film 140, which is arranged between the above-mentioned solar cells and the back plate; wherein, the specific functions of each plate and film are as described above.

The preferred embodiments of the present invention as described above are disclosed for illustration purposes. For those skilled in the art, various modifications, changes and additions can be made without departing from the spirit and scope of the present invention. , these amendments, changes and additions should be deemed to belong to the protection scope of the present invention.

Claims (17)

1. a feature board is characterized in that, comprises:

Base material film; And

Reflectance coating, it is formed on the above-mentioned base material film.

2. feature board according to claim 1 is characterized in that, is formed with a plurality of concavo-convex on the surface of above-mentioned reflectance coating.

3. feature board according to claim 2 is characterized in that, the above-mentioned concavo-convex prism structures that has.

4. feature board according to claim 1 is characterized in that, above-mentioned base material film is to be selected from more than one of the group be made up of polyvinyl fluoride, polyethylene terephthalate and ethylene-tetrafluoroethylene copolymer.

5. feature board according to claim 1 is characterized in that, also comprises the silicon oxide layer or the undercoat that are configured between above-mentioned base material film and the reflectance coating.

6. a solar module is characterized in that, comprises:

Solar battery sheet,

Glass, it reaches attached to the front of above-mentioned solar battery sheet

Backboard, it is attached to the back of above-mentioned solar battery sheet, and has reflectance coating;

The light that sees through above-mentioned glass is reflected after the film reflection, to solar battery sheet optically focused.

7. solar module according to claim 6 is characterized in that, is formed with a plurality of concavo-convex on the surface of above-mentioned reflectance coating.

8. solar module according to claim 7 is characterized in that, the above-mentioned concavo-convex prism structures that has.

9. solar module according to claim 6 is characterized in that above-mentioned backboard also comprises the base material film of the back that is formed on reflectance coating,

Above-mentioned base material film is to be selected from more than one of the group be made up of polyvinyl fluoride, polyethylene terephthalate and ethylene-tetrafluoroethylene copolymer.

10. solar module according to claim 9 is characterized in that, also comprises the silicon oxide layer or the undercoat that are configured between above-mentioned base material film and the reflectance coating.

11. a solar module is characterized in that, comprises:

Solar battery sheet;

Glass, it is attached to the front of above-mentioned solar battery sheet;

Infrared reflection film, it is configured between above-mentioned solar battery sheet and the glass; And

Backboard, it is attached to the back of above-mentioned solar battery sheet, and has reflectance coating.

12. a solar module is characterized in that, comprises:

Solar battery sheet;

Glass, it is attached to the front of above-mentioned solar battery sheet;

Backboard, it is attached to the back of above-mentioned solar battery sheet, and has reflectance coating; And

Refraction film, it is configured between solar battery sheet and the backboard.

13. according to claim 11 or 12 described solar modules, it is characterized in that, be formed with a plurality of concavo-convex on the surface of above-mentioned reflectance coating.

14. solar module according to claim 13 is characterized in that, the above-mentioned concavo-convex prism structures that has.

15. according to claim 11 or 12 described solar modules, it is characterized in that above-mentioned backboard also comprises the base material film of the back that is formed on reflectance coating,

Above-mentioned base material film is by being selected from by polyvinyl fluoride more than one of the group that polyethylene terephthalate and ethylene-tetrafluoroethylene copolymer are formed.

16. solar module according to claim 15 is characterized in that, also comprises the silicon oxide layer or the undercoat that are configured between above-mentioned base material film and the reflectance coating.

17. solar module according to claim 11 is characterized in that, also comprises the refraction film that is configured between above-mentioned solar battery sheet and the backboard.

Images