JP2001148495A - Method for manufacturing solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a solar cell module in which productivity of solar cell module can be enhanced by shortening the time of sealing process and long term reliability of solar cell module can be enhanced by preventing a sealing material from creasing to provide a moisture entering passage. SOLUTION: In the method for manufacturing a solar cell module comprising a solar cell including a transparent insulating substrate 1, a transparent electrode layer 2, a semiconductor photoelectric conversion layer 3 and a backside electrode layer 4 formed sequentially on the transparent insulating substrate 1, and a material for sealing the backside of the solar cell, a normal temperature adhesive film 7 is employed at least as a part of the sealing material at the sealing of the backside of the solar cell.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a solar cell module, and more particularly to an improvement in a method for sealing a solar cell module.

[0002]

In recent years, from environmental problems such as an increase in the CO ₂ of the problems and the atmosphere of the depletion of fossil energy resources, has been desired the development of a new clean energy, it is especially expected to solar power I have. Already, crystalline solar cells using single crystal silicon, polycrystalline silicon, or the like have been put to practical use as outdoor power solar cells. On the other hand, a thin-film solar cell using amorphous silicon or the like has attracted attention as a low-cost solar cell because it requires less raw material, and is being actively developed.

A thin-film solar cell module includes a transparent electrode layer made of a transparent conductive oxide such as SnO ₂ , ZnO, and ITO, a semiconductor photoelectric conversion layer made of amorphous silicon, and the like, which are sequentially laminated on a glass substrate. , Ag,
The solar cell includes a back electrode layer made of a metal such as Cr. Each of the above layers is divided so as to correspond to a plurality of unit cells, and unit cells adjacent to each other are connected in series and integrated.

The back surface of the solar cell is, for example, an ethylene-vinyl acetate copolymer (EV) containing a crosslinking agent.
A) and a back cover film made of vinyl fluoride resin (for example, Tedlar manufactured by DuPont) or vinyl fluoride resin / Al / vinyl fluoride resin, and sealed by a vacuum laminating method or the like. Has been stopped. EVA used as a sealant in a conventional solar cell module has an advantage that it has a refractive index close to that of glass and is inexpensive.

However, in the vacuum laminating method used in the conventional sealing step, a long time is required in a step of cooling the crosslink after heating and crosslinking the sealant sheet, thereby lowering the productivity of the solar cell module. It is a cause to cause. In addition, wrinkles often occur in the sealing agent sealed through the heating and cooling processes. If the sealant is wrinkled, a gap may be formed between the sealant and the back cover film to serve as a path for water to enter, which may deteriorate the long-term reliability of the solar cell module.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the productivity of a solar cell module by shortening the time of a sealing step, and to generate wrinkles as a path for moisture to enter a sealing agent. It is an object of the present invention to provide a method for manufacturing a solar cell module which can improve the long-term reliability of the solar cell module.

[0007]

According to the present invention, there is provided a method for manufacturing a solar cell module, comprising a transparent insulating substrate, a transparent electrode layer sequentially laminated on the transparent insulating substrate, a semiconductor photoelectric conversion layer, and a back electrode layer. In a method of manufacturing a solar cell module including a battery cell and a sealant for sealing the back surface of the solar cell, in sealing the back surface of the solar cell, at least a part of the sealant It is characterized by using a room temperature adhesive film.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the room-temperature adhesive film may be used as a sealant covering the entire back surface of the solar cell, or may be used as a sealant covering only the peripheral portion of the back surface of the solar cell. You may. When a room-temperature adhesive film is used as a sealant that covers only the peripheral portion of the back surface of the solar cell, a sealant sheet made of EVA or the like is provided at the center of the back surface of the solar cell and sealed by a vacuum laminator.

The room-temperature adhesive film used in the present invention may be a double-sided pressure-sensitive adhesive film having a pressure-sensitive adhesive on both sides of a film substrate, for example, an acrylic resin film coated with a pressure-sensitive adhesive on both surfaces, or a film substrate. May be a single-sided adhesive type having an adhesive on one side, for example, a polyester film coated with an adhesive on one side. When a double-sided adhesive room-temperature adhesive film is used as in the former, a back cover film made of vinyl fluoride resin or vinyl fluoride resin / Al / vinyl fluoride resin may be further bonded to the back surface of the room-temperature adhesive film. it can.

When a room-temperature adhesive film is used as a sealing agent as in the present invention, sealing can be performed at room temperature in a short time. Therefore, the productivity of the solar cell module can be improved as compared with the case where the conventional vacuum lamination method is used. In addition, since no wrinkles are generated in the sealant made of the room-temperature adhesive film, there is no gap between the sealant and the back cover film as a moisture intrusion path. Reliability can be improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a peripheral portion of a solar cell module according to the present invention. Area 92cm x 46cm,
On a glass substrate 1 having a thickness of 4mm of soda lime glass, a transparent electrode layer 2 made of SnO ₂ is formed. The transparent electrode layer 2 is scribed at a position of a scribe line 2a corresponding to a plurality of unit cells, and is about 10 m in length.
It is divided into m string widths. An amorphous silicon-based semiconductor photoelectric conversion layer 3 having a pin junction is formed on the transparent electrode layer 2. Semiconductor photoelectric conversion layer 3
Is about 100 from the scribe line 2a of the transparent electrode layer 2.
It is scribed at the position of the scribe line 3a shifted by μm. This scribe line 3a becomes an opening for connection between the transparent electrode layer 3 and the back electrode layer. Semiconductor photoelectric conversion layer 3
On the back, a back electrode layer 4 formed by laminating ZnO and Ag is formed. The back electrode layer 4 and the semiconductor photoelectric conversion layer 3 on the surface side thereof
Is scribed and divided at the position of the scribe line 4a shifted from the scribe line 3a by about 100 μm. As described above, a plurality of unit cells (string width is about 10 mm) are connected in series to form an integrated thin-film solar cell.

In order to electrically separate the solar cell from the outside over the entire periphery of the glass substrate 1, the transparent electrode layer, the semiconductor photoelectric conversion layer and the back electrode layer are placed at a position 5 mm from the outer periphery of the glass substrate 1. To form an insulating isolation region. Also, the semiconductor photoelectric conversion layer and the back electrode layer outside the strings at both ends are set to about 3.5 mm.
The width is removed to form a wiring area. A solder 5 is attached to this wiring area, and a bus bar electrode 6 made of a solder-plated copper foil is formed thereon. The bus bar electrodes 6 are arranged in parallel with the solar cell strings. A conductor tape (not shown) is connected to the bus bar electrode 6.

In this embodiment, a room-temperature adhesive film 7 in which an adhesive is applied to both sides of an acrylic resin film is used as a sealant for covering the entire back surface of the solar cell. A release paper is attached to the surface of the pressure-sensitive adhesive applied to both surfaces of the room-temperature adhesive film 7. The release paper stuck on one surface of the room-temperature adhesive film 7 was peeled off, and the room-temperature adhesive film 7 was pressed onto the entire back surface of the solar battery cell produced as described above and adhered with an adhesive. Next, the release paper stuck on the other surface of the room-temperature adhesive film 7 was peeled off,
A back cover film 8 made of vinyl fluoride resin / Al / vinyl fluoride resin was pressed against the surface, and adhered with an adhesive.

The working time of the sealing step with the room-temperature adhesive film 7 in this embodiment was about 1 minute. Also, no wrinkles occurred in the room-temperature adhesive film 7 and the back cover film 8. Then, on the back surface of the solar cell module manufactured in this manner, the flatness was good, with only slight irregularities occurring in the area corresponding to the portion of the bus bar electrode 6.

On the other hand, when a sealing agent and a back cover film made of an EVA sheet containing a cross-linking agent are laminated on the back surface of the solar battery cell and cured by heating at 150 ° C. by a vacuum laminator, the working time of the entire sealing process is 30 minutes. In addition, wrinkles were observed on a part of the back surface.

[0017]

As described above in detail, the use of the method of the present invention improves the productivity of the solar cell module by shortening the time of the sealing step, and provides a path for moisture to enter the sealing agent. The long-term reliability of the solar cell module can be improved without generating wrinkles.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a peripheral portion of a solar cell module manufactured by a method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Glass substrate 2 ... Transparent electrode layer 3 ... Semiconductor photoelectric conversion layer 4 ... Back electrode layer 5 ... Solder 6 ... Bus bar electrode 7 ... Room temperature adhesive film 8 ... Back cover film

Claims (4)

[Claims] 1. A solar cell comprising a transparent insulating substrate, a transparent electrode layer, a semiconductor photoelectric conversion layer, and a back electrode layer sequentially laminated on the transparent insulating substrate, and a seal for sealing a back surface of the solar cell. A method of manufacturing a solar cell module including a stopper, wherein the room-temperature adhesive film is used as at least a part of the sealing agent in sealing the back surface of the solar cell, Method. 2. A room-temperature adhesive film is used as a sealant for a peripheral portion of the solar cell.
A method for manufacturing the solar cell module according to the above. 3. The method for manufacturing a solar cell module according to claim 1, wherein the room-temperature adhesive film is formed by applying an adhesive to both surfaces of an acrylic resin film. 4. The method for manufacturing a solar cell module according to claim 1, wherein the room-temperature adhesive film is formed by applying an adhesive to one surface of a polyester film.