KR20240146786A - G2g photovoltaic module and the method for manufacturing the same - Google Patents

Abstract

A solar cell module according to one embodiment of the present invention comprises a solar cell panel and a metal plate portion provided at the rear of the solar cell panel, wherein the solar cell panel comprises: a solar cell; a front glass positioned at the front of the solar cell; a rear glass positioned at the rear of the solar cell; and an encapsulating material provided between the solar cell and the front glass and between the solar cell and the rear glass; wherein the front glass is a colored glass having a color applied to part or all of it, and the metal plate portion comprises a painted silver metal plate positioned at the rear of the rear glass.

Description

G2G PHOTOVOLTAIC MODULE AND THE METHOD FOR MANUFACTURING THE SAME

The present invention relates to a G2G solar cell module and a method for manufacturing the same, and more specifically, to a G2G solar cell module in which a colored metal plate is bonded to the rear of a G2G solar cell module to which double-sided glass is applied, and a method for manufacturing the same.

Recently, the development of environmentally friendly alternative energy sources and the diversification of future energy sources have emerged as international issues. Under this background, solar cells utilizing solar energy are attracting attention as a promising alternative energy source for the future.

Early solar power generation projects were carried out by installing solar cell modules in forests and mountains, but as problems such as indiscriminate development and environmental damage were pointed out, the need to use the roofs and exterior walls of buildings to generate solar power is increasing.

When solar modules also function as building materials, they are called building-integrated solar modules or BIPV (Building Integrated Photovoltaic) modules.

In the case of building-integrated solar modules, colored glass is sometimes used to improve aesthetics and to ensure that the solar cells are not visible from the outside, and recently, development of solar cell modules using colored glass is actively underway.

In addition, considering wind pressure resistance performance, fire resistance performance, etc., a G2G (Glass to Glass) solar cell module is also being developed in which glass is installed on the rear of the solar cell instead of the back sheet.

However, in order for the color implemented on the glass in front of the solar cell of the solar cell module using methods such as deposition or printing to be easily identified, the glass on the rear of the solar cell must be black or a similar dark color, so there is a limitation that the color must be applied to the glass on the rear as well.

A solar cell module according to one embodiment of the present invention is provided with a colored metal plate portion at the rear of a solar cell module, thereby making coloring of glass located at the rear of the solar cell unnecessary.

Additionally, it aims to prevent moisture from being absorbed through the side of the solar cell module, thereby shortening the lifespan of the solar cell module.

A solar cell module according to one embodiment of the present invention comprises a solar cell panel and a metal plate portion provided at the rear of the solar cell panel, wherein the solar cell panel comprises: a solar cell; a front glass positioned at the front of the solar cell; a rear glass positioned at the rear of the solar cell; and an encapsulating material provided between the solar cell and the front glass and between the solar cell and the rear glass; wherein the front glass is a colored glass having a color applied to part or all of it, and the metal plate portion comprises a painted silver metal plate positioned at the rear of the rear glass.

A method for manufacturing a solar cell module according to one embodiment of the present invention

According to the present invention, in a solar cell module, even if the glass located at the rear of the solar cell is not colored black, the color colored in the glass located at the front of the solar cell can be recognized, thereby increasing the degree of freedom in color implementation and reducing manufacturing costs.

Additionally, it prevents moisture from being absorbed through the sides of the solar cell module, thereby shortening the lifespan of the solar cell module.

Figure 1 is a perspective view schematically illustrating a part of a solar cell module according to one embodiment of the present invention.
Figure 2 is a cross-sectional drawing schematically illustrating a cross-section taken along line AA' of Figure 1.
Figure 3 is a drawing showing a frame added to the cross-sectional view of Figure 2.
Figure 4 is a drawing explaining the forming process of a metal plate portion.
Figure 5 is a perspective drawing schematically illustrating a metal plate portion.
Figure 6 is a drawing explaining a method for manufacturing a solar cell module according to one embodiment of the present invention.
Figure 7 is a drawing explaining a method for manufacturing a solar cell module according to another embodiment of the present invention.

Hereinafter, a solar cell module according to one embodiment of the present invention will be described with reference to the attached drawings.

FIG. 1 is a perspective view schematically illustrating a portion of a solar cell module according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically illustrating a cross-section taken along line AA' of FIG. 1.

Referring to FIGS. 1 and 2, a solar cell module according to one embodiment of the present invention includes a solar cell panel (100), a metal plate portion (200) provided at the rear of the solar cell panel (100), a sealing portion (300) provided between the solar cell panel (100) and the metal plate portion (200), and a panel bonding portion (400) that bonds the solar cell panel (100) and the metal plate portion (200).

A solar panel (100) includes a solar cell (110) that receives sunlight and generates electricity, a front glass (120) positioned in front of the solar cell (110), a rear glass (130) positioned in the rear of the solar cell (110), and two or more sealing materials (140). Accordingly, the solar cell (110) is positioned between the front glass (120) and the rear glass (130).

A solar cell (110) is a semiconductor device that directly converts solar energy into electricity, and may be formed, for example, by including a silicon wafer having a P-N junction structure made up of an n layer and a p layer, an anti-reflection film formed on the upper surface of the silicon wafer and functioning to allow light to be well absorbed into the interior of the solar cell, and front and rear electrodes that are printed and laminated on the upper and lower surfaces of the silicon wafer, respectively, to draw electricity generated inside the silicon wafer to the outside.

The front glass (120) above may be made of low-iron tempered glass with less iron to protect the solar cell (110) from external impacts, etc., prevent reflection of sunlight, and increase the transmittance of sunlight. Meanwhile, the inner surface of the front member (120) may be embossed or texturized to increase the light scattering effect. In addition, the front glass (120) may be colored glass, i.e., color implemented. The color may be implemented by a method such as deposition or printing, and there is no particular limitation on the method.

The rear glass (130) above is a layer that protects the solar cell (110) at the rear of the solar cell (110) and may have waterproofing, insulation, and ultraviolet ray blocking functions. The rear glass (130) may have excellent reflectivity characteristics so that sunlight incident from the front glass (120) side may be reflected and re-incident to the solar cell (110). The rear glass (130) may include a through hole (not shown) that is perforated in the front-back direction. Through the through hole, a part of a ribbon (not shown) may protrude and stick out toward the rear of the rear glass (130), and this ribbon is connected to a junction box (not shown).

The above encapsulating material (140) is also called a filler, and is provided between the front glass (120) and the solar cell (110), and between the solar cell (110) and the rear glass (130), respectively. Two or more encapsulating materials (140) may be used, and the presence of two or more encapsulating materials (140) means that they are respectively placed on the upper and lower portions of the solar cell (110) and laminated before the laminating process. To explain this in more detail, one of the encapsulating materials may be positioned on the front side of the solar cell (110), and the other may be positioned on the rear side of the solar cell (110). The encapsulating material (140) may be bonded by lamination and block moisture or oxygen that may have a negative effect on the solar cell (110).

As the encapsulating material (140), an ethylene-vinyl acetate (EVA) sheet or film can be used as an example, but is not limited thereto. In the present embodiment, the EVA sheet (140) can be a colorless film. Such an EVA film can not only strengthen the bonding between the solar cell (110) and other materials, but also protect the solar cell (110) from external impact and improve light transmittance. However, the present invention is not limited thereto, and the encapsulating material (140) can be low-density polyethylene (LDPE), polyvinyl butyral, silicon resin, ester resin, olefin resin, or the like.

The metal plate (200) includes a rear plate (210) that faces the rear surface of the solar rear glass (130), and a side plate (220) that extends forward from an edge of the rear plate. The rear plate (210) is formed to have a larger size than the rear glass (130) of the solar cell panel (100), and the side plate (220) is positioned spaced outward from the side surface of the solar cell panel (100). The metal plate (200) may be a metal plate painted in a dark color, and for example, may be a galvalume steel plate, a GI steel plate, a magnesium alloy-plated steel plate, an aluminum plate, a zinc plate, etc. The paint color of the metal plate may be a dark color, and here, the dark color may be a chromatic color close to black or black. Since the front glass (110) and the metal plate (200) each have a color, various colors can be implemented by combining the colors of the two components.

The metal plate portion (200) may further include a cut portion (230). The cut portion (230) is formed by perforating a portion of the rear plate portion (210) in the front-back direction. A junction box (not shown) is coupled to the rear of the cut portion (230).

Meanwhile, the height of the metal plate (220) may be approximately the same as the height of the solar panel (100) or slightly smaller than that.

The sealing part (300) is provided between the solar panel (100) and the side plate (220). The sealing part (300) is a sealant that is applied with fluidity and fills the space between the solar panel (100) and the side plate xcv (220) to prevent water or air from entering. Silicone, etc. that has properties resistant to ultraviolet rays can be used.

The panel adhesive (400) serves to adhere the rear glass (130) of the solar cell panel (100) and the back plate (110) of the metal plate (100). The panel adhesive (400) may be made of the same material as the encapsulant (140). That is, the adhesion between the rear glass (130) and the back plate (110) may be achieved by laminating while interposing the encapsulant therebetween.

At this time, laminating for adhesion between the rear glass (130) and the rear plate (110) may be performed simultaneously with laminating the solar panel (100), or the solar panel (100) may be manufactured by first laminating it, and then performed as a separate subsequent laminating process.

Meanwhile, the solar cell module according to one embodiment of the present invention may further include a frame (500) coupled to the metal plate portion (100). The frame (500) is a portion that is fixed to a building or structure, and its shape is not particularly limited. For example, it may be a general frame having a cross-section in the shape of the letter 'ㄷ' and allowing a solar panel to be fitted into an opening, and may also be a Z-bar coupled to the rear of the solar panel. FIG. 3 illustrates an example in which a Z-bar is used when explaining one embodiment of the present invention. Referring to FIG. 3, the frame is coupled to the rear of the rear plate portion (210) of the metal plate portion (200). The coupling between the metal plate portion (200) and the frame (500) may be achieved by a frame adhesive portion (600), and the frame adhesive portion (600) may include a Norton tape (610) and structural silicone (620).

Hereinafter, a method for manufacturing a solar cell module having the above configuration is described.

FIG. 6 illustrates a method for manufacturing a solar cell module according to one embodiment of the present invention, and FIG. 7 illustrates a method for manufacturing a solar cell module according to another embodiment of the present invention.

First, referring to FIG. 6, a method for manufacturing a solar cell module according to one embodiment of the present invention includes a metal plate forming step (S1), a G2G panel manufacturing step (S2), a metal plate bonding step (S3) and a G2G panel bonding step, and a border sealing step (S4).

First, referring to FIG. 4, the forming step (S1) of the metal plate portion will be described. FIG. 4 is a drawing explaining a method of forming the metal plate portion (100). Referring to FIG. 4, the forming step of the metal plate portion (100) includes a preparation step of the metal plate material as shown in FIG. 4(a), a cutting step as shown in FIG. 4(b), and a bending step as shown in FIG. 4(c).

To explain each of these steps in more detail, in the metal sheet preparation step, a metal sheet cut to a predetermined size, that is, a predetermined width and length, is prepared.

And, in the cutting step, four corners are cut. At this time, the cutting length of the corners becomes the same as the height of the side plate (220). Meanwhile, the cutting of the cutting part (230) can also be performed at the cutting step.

Next, in the folding step, the part corresponding to the side plate (220) is folded up. Fig. 5 is a perspective view schematically illustrating the formed metal plate part (100).

Hereinafter, the G2G panel manufacturing step (S2) will be described. The G2G panel manufacturing step includes a laminating process of electrically connecting a plurality of cells in series to create a string, positioning and laminating an encapsulant (140) and a front glass (120) and a back glass (130) on both sides of a pre-manufactured string, and then heating and pressurizing so that the encapsulant (140) seals between the string and the front glass (120) and the back glass (130). This laminating process must apply heat to the encapsulant laminated in a sheet form to cause a chemical reaction, and pressurize from above so that the encapsulant completely fills the main surface of the string. Therefore, the laminating device for a solar module must have a heating means disposed at the bottom and a pressurizing means disposed at the top. An example of the laminating process is to position the front glass (120) so that it is positioned above the heating means (not shown) of the laminating device, and the pressurizing means (not shown) presses downward from the rear glass (130) located above to apply pressure. At this time, heating and pressurizing should be performed in a vacuum or reduced pressure state so that no gap or void is formed during the process of the sealing material wrapping the entire string.

Hereinafter, the bonding step (S3) of the metal plate portion and the G2G panel will be described. When the solar panel is manufactured, bonding between the metal plate portion (200) and the G2G solar panel (100) is achieved through a subsequent laminating process. The solar panel (130) is placed in a laminating device with the front glass (120) facing downward and the back glass (130) facing upward. Then, a sealant is placed on top of the back glass (130) of the solar panel (130), and the metal plate portion (200) is placed on top of the sealant. When the metal plate portion (200) is placed, the opening of the metal plate portion is directed downward so that the back plate portion (210) is placed on top of the sealant, and the side plate portion (220) is spaced apart from the side of the solar panel (100). A space that can be filled with a sealant must be provided between the side plate (220) and the side surface of the solar panel (100). Meanwhile, the ribbon protruding from the rear of the rear glass (120) of the solar panel (100) must be able to protrude to the upper portion of the rear plate (210) through the cut portion (230) and be electrically connected to a junction box (not shown).

Hereinafter, the edge sealing step (S4) will be described. When the bonding between the metal plate portion (200) and the solar cell panel (100) is completed, a silicone sealant is applied to the space between the side plate portion (210) and the side surface of the solar cell panel (100) and cured to form a sealing portion (300). This sealing portion (300) prevents moisture from being absorbed through the side surface of the solar cell panel (100), thereby shortening the module durability and lifespan.

Meanwhile, in explaining this embodiment, there is no limitation on the order of the steps between the metal plate forming step (S1) and the G2G panel manufacturing step (S2).

Hereinafter, with reference to FIG. 7, a method for manufacturing a solar cell module according to another embodiment of the present invention will be described. Referring to FIG. 7, a method for manufacturing a solar cell module according to one embodiment of the present invention includes a metal plate portion forming step (S'1), a solar cell module lay-up step (S'2), a solar cell module laminating step (S'3), and a border sealing step (S'4).

The forming step (S'1) of the metal plate portion is the same as in the previous embodiment, so a repeated description is omitted.

Hereinafter, the lay-up step (S'2) of the solar cell module will be described. The previous embodiment includes multiple laminating processes. That is, the laminating process is performed in the G2G panel manufacturing step, and then the subsequent laminating process is performed in the bonding step of the metal plate portion and the G2G panel. On the other hand, in the present embodiment, the manufacturing of the solar cell panel and the bonding of the metal plate portion and the solar cell panel are performed simultaneously through one laminating process. To this end, each component constituting the solar cell panel (100) and the metal plate portion (200) are all laid up at once.

To explain this in more detail, from the bottom, the front glass (120), the encapsulant (140), the solar cell (110), the encapsulant (140), the rear glass (130), the encapsulant, and the metal plate (200) are sequentially laminated. During this process, ribbon soldering may be performed as needed. Briefly describing the ribbon, a plurality of solar cells (110) are connected in series by an interconnection ribbon (not shown) and play a role of flowing charges collected in the finger lines of the solar cells, and a bus ribbon (not shown) is connected to a plurality of interconnection ribbons and plays a role of transmitting charges collected through the interconnection ribbons to the junction box. The connection between the interconnection ribbon and the bus ribbon is made by soldering and can be performed in the layup process. When arranging the metal plate portion (200), the opening is directed downward, and the side plate portion (220) is positioned away from the side of the front glass (120) and the rear glass (130).

Meanwhile, the layup may be performed in the opposite order. The metal plate (200) is placed at the bottom with the opening facing upward, and the encapsulant, rear glass (130), encapsulant (140), solar cell (110), encapsulant (140), and front glass (120) are sequentially laminated thereon. In this case, soldering for connecting the ribbons may also be performed during the layup process. When arranging the metal plate, the side plate (220) is positioned so as to be spaced outward from the sides of the front glass (120) and the rear glass (130).

Hereinafter, the laminating step (S'3) of the solar cell module is described. The laminating process is performed by a laminating device. As described above, the laminating device for the solar module must have a heating means located at the bottom and a pressurizing means located at the top. In order to prevent the formation of a gap or void during the process of the encapsulant wrapping the entire solar cell, heating and pressurization must be performed in a vacuum or reduced pressure state.

In this embodiment, the edge sealing step (S'4) is the same as in the previous embodiment, so a repetitive description is omitted.

100: Solar Panels
110: Solar Cell
120: Front glass
130: Rear glass
140: Bongjijae
200: Metal plate part
110: Back plate
120: Side panel
130: Incision
300: Ceiling
400: Panel adhesive
500: Frame
600: Frame adhesive
610: Norton Tape
620: Structural Silicone

Claims (5)

It comprises a solar panel and a metal plate provided at the rear of the solar panel,
The above solar panel,
solar cell;
Front glass located in front of the solar cell;
A rear glass positioned at the rear of the solar cell;
Including a sealing material provided between the solar cell and the front glass and between the solar cell and the back glass;
The above front glass is colored glass with some or all of the color applied.
A solar cell module comprising the metal plate portion including a painted silver metal plate positioned at the rear of the rear glass.
In the first paragraph,
The above metal plate part
A rear plate positioned at the rear of the above rear glass;
Including a side plate extending forward from the end of the above rear plate.
Solar cell modules.
In the second paragraph,
It further includes a sealing portion provided between the side plate and the solar cell panel,
The above rear plate is formed larger than the solar panel,
The above side plate is provided spaced apart from the side of the solar cell panel,
The above sealing portion is provided in the space between the side of the solar panel and the side plate.
Solar cell modules.
In the first paragraph,
It further includes a junction box provided on the outside of the above metal plate portion,
The above metal plate portion is provided with a cutting portion,
A solar cell module in which the above junction box is provided to cover the above cut portion from the outside.
A method for manufacturing a solar cell module according to any one of claims 1 to 4,
A step of forming a metal plate portion including a rear plate portion and a side plate portion extending forward from an edge of the rear plate portion;
A laminating step including laminating a sealant between the rear plate and the rear glass;
Method for manufacturing solar cell modules.