JP2000277780A - Solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery which shows superior environment-resistant performance by enabling suppression of the corrosion of a rear electrode and a connection line. SOLUTION: This solar cell module has a transparent substrate 1, a solar battery cell 2 provided at the rear of the transparent substrate, an output extract line 4 connected to the solar battery cell 2, a filler 5 for sealing the solar battery cell, and a rear sealing material 6 provided at the rear of material 6, and whose output takeout line 4 is drawn around to the rear side of the rear sealing material 6 through an output takeout part O from the inside of the filler. In this case, the output takeout line 4 is formed, being extended along the rear of the solar battery module via the filler 5, and the extension of the output takeout line 4 is covered with a rear sealing material 6 via the filler 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a solar cell module.

[0002]

2. Description of the Related Art Since a solar cell module is used in a severe outdoor environment such as on a roof, there is a strong demand for improvement of environmental resistance performance of the solar cell. Conventionally, in order to maintain the environmental resistance performance of a solar battery cell, various studies have been made on the constituent members of a solar battery module and a combination structure of each member.

FIG. 4 shows an example of a conventional thin-film solar cell module. This solar cell module is similar to that disclosed in Utility Model Registration Publication No. 2563877. In FIG. 4, a plurality of thin-film solar cells 2 are provided on the back surface of a front cover glass 1 as a transparent substrate.
Are connected in series and / or in parallel. The output electrode 4 made of, for example, a metal foil is connected to the back electrode 3. These back sides are sealed with the filler 5. Specifically, the filler 5 is formed by, for example, hot-melting EVA with the end of the output wire 4 standing. The back surface of the filler 5 is covered with a back sealing material (weatherproof film) 6 having a three-layer structure in which both surfaces of a metal foil 6a are sandwiched between insulating films 6b. The back surface sealing material 6 is provided with a through hole as an output extraction portion O for extracting the output extraction line 4 to the outside. Output lead wire 4
Is routed to the back surface side of the back surface sealing material 6 through the through hole. A terminal 7 is provided at the end of the output lead wire 4 routed to the outside.
Are attached by soldering or screwing, and an output lead wire 8 is connected to the terminal 7. A terminal section including these output lead wires 4, terminals 7 and output lead wires 8 is covered with a terminal box 9.

In some cases, the exposed portion of the filler 5 and the output line 4 in the output extraction section O is sealed with a protective resin such as silicone resin. Similarly, the surface of the terminal 8 may be sealed with a protective resin such as a silicone resin.

FIG. 5 shows a conventional crystalline solar cell module. In FIG. 5, a plurality of crystalline solar cells 11 are provided on the back side of the front cover glass 1, and these solar cells 11 are connected by connection lines 12. The output lead wire 4 made of, for example, a metal foil is connected to the terminal solar cell 11. Other configurations are the same as those in FIG.

In these solar cell modules, since the filler 5 is exposed to the outside air at the output extraction portion O,
Moisture and waterproof properties are not enough. Further, even if the output take-out portion O is protected by a silicone resin or the like, it is not so much different from the state of being exposed to the outside air, and the moisture-proof and waterproof properties are not sufficient. As a result, in particular, when water infiltrates the terminal box 9, since water enters the filler 5 through the output extraction portion O, corrosion of the output extraction wire 4, and further, corrosion of the back electrode 3 and the like are likely to occur. This is a major weakness in the environmental resistance performance of solar cell modules. Actually, many troubles of the solar cell module are caused by defects such as corrosion of the back electrode 3 due to moisture that has entered from the outside.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a solar cell module having excellent environmental resistance.

[0008]

The solar cell module of the present invention comprises a transparent substrate, a solar cell provided on the back side of the transparent substrate, an output line connected to the solar cell, and A filler for sealing a solar cell, and a backside sealing material provided on the backside of the filling material, wherein the output extraction line passes through an output extraction portion from inside the filler and the backside of the backside sealing material. In the solar cell module drawn around, the filler at the output extraction portion is not directly in contact with outside air. Here, the output extraction portion refers to a portion where the output extraction line crosses the back surface sealing material. Further, a material having particularly excellent moisture resistance and water resistance is used as the back surface sealing material.

[0009] For example, it is preferable that the output line is formed to extend along the back surface of the solar cell module, and the extension of the output line is covered with a back surface sealing material. More specifically, in the extension of the output line, the back surface sealing material,
A laminated structure of the output extraction line and the back surface sealing material is formed. Normally, a filler or the like is interposed between the output lead-out line and the back surface sealing material to bond them.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Each member constituting the solar cell module of the present invention will be briefly described.

A glass substrate or the like is used as the transparent substrate. A plurality of solar cells are provided on the back side of the transparent substrate. The photovoltaic element constituting the solar cell may be either a thin film type or a crystalline type. Thin-film solar cells are connected in series and / or in parallel by a back electrode. The back electrode is made of a metal foil, a conductive paste, or the like. The crystalline solar cells are connected by connection lines. An output extraction line is connected to the thin-film solar cell via a back electrode, and an output extraction line is directly connected to the crystalline solar cell at the terminal cell. Such an output lead is routed to the outside as described later, and a terminal and an output lead are connected to its end.

The above solar cell, back electrode, connection line,
A member such as an output lead wire is sealed with a filler. As the filler, EVA (ethylene / vinyl acetate copolymer), PVB (polyvinyl butyral), silicone resin, or the like is used. The filler can be easily formed by a method such as hot melt.

A back surface sealing material is provided on the back surface of the filler. The backside sealing material may be a single insulating film having excellent moisture resistance and water resistance, such as a fluorine-based film or a PET film, or a metal foil made of aluminum or the like sandwiched between two insulating films. Used in the form of a layered structure. Since the metal foil provided at the center of such a back surface sealing material has a function of improving moisture resistance and water resistance, it is effective in protecting the solar cell from moisture.

The output lead-out line is routed from the inside of the filler through the output lead-out section to the back side of the back sealing material. The output extraction portion is formed as a gap between the back surface sealing materials or a through hole provided in the back surface sealing material. A terminal is provided at an end of the output lead wire routed to the outside, and an output lead wire is connected to this terminal. These terminals are housed in a terminal box.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an example of a thin-film solar cell module according to the present invention. In FIG. 1, a plurality of thin-film solar cells 2 are provided on the back surface of a front cover glass 1 as a transparent substrate, and these solar cells 2 are connected in series and / or in parallel by a back electrode 3. ing. The output electrode 4 made of, for example, a metal foil is connected to the back electrode 3. These back surfaces are sealed with the filler 5 in a state where the output lead wires 4 are routed. The back surface of the filler 5 is covered with a back sealing material 6 having a three-layer structure in which both surfaces of a metal foil 6a are sandwiched between insulating films 6b. In this case, the gap between the two back sealing materials 6 is
It is an output extraction section O for extracting the output extraction line 4 to the outside. Output extraction line 4 extracted from output extraction section O
Is extended along the back surface of the solar cell module. That is, the back sealing material 6 on one side is superimposed on the filler 5, the EVA and the output wire 4 routed from the output outlet O to the outside are superimposed on the back sealing material 6, and the output wire 4 is further extended. The EVA is overlapped on the part and the back surface sealing material 6 on the other side
Are stacked and hot-melt or the like is performed to form a laminated structure on the back surface side. The length of the overlap portion (corresponding to the distance from the outside air to the output extraction portion) between the output extraction line 4 and the outer back surface sealing material 6 is desirably 10 mm or more, and the longer the length, the higher the effect. A terminal 7 is attached to an end of the output lead wire 4 routed to the outside by soldering or screwing, and an output lead wire 8 is connected to the terminal 7. A terminal section including these output lead wires 4, terminals 7 and output lead wires 8 is covered with a terminal box 9.

As described above, in the solar cell module of the present invention, the filler 5 of the output extraction portion O is covered with the back surface sealing material 6 and is not in direct contact with the outside air. For this reason, the distance from the outside air to the filler 5 of the output extraction part O is longer than before, and it is possible to effectively prevent the intrusion of moisture from the outside air. Therefore, the corrosion of the output lead wire 4 and the corrosion of the back electrode 3 and the like can be suppressed, and the environmental resistance performance of the solar cell module can be improved. Further, since the above-described effects are obtained, it is not necessary to seal the inside of the terminal box 9 with a protective resin, and the workability is improved.

FIG. 2 is a sectional view of a crystalline solar cell module according to the present invention. In FIG. 2, a plurality of crystalline solar cells 11 are provided on the back side of the front cover glass 1, and these solar cells 11 are connected to connection lines 12.
Connected by In addition, the terminal solar cell 11
Is connected to an output lead wire 4 made of, for example, a metal foil. Other configurations are the same as those in FIG.

FIG. 3 is a sectional view of another thin-film solar cell module according to the present invention. 3, the configuration of the solar cell 2, the back electrode 3, and the filler 5 on the back surface of the front cover glass 1 is the same as that in FIG. In this solar cell module, a through-hole is provided in the back surface sealing material 6 so that the output extraction portion O
Is formed, and the output lead wire 4 is formed on one side of the back surface sealing material 6.
And is extended through the filler 5. Further, another layer of the back surface sealing material 13 is laminated on the other side of the back surface sealing material 6 and the extension of the output line 4 via the filler 5.

The solar cell module shown in FIGS. 2 and 3 can also obtain the same effect as that of FIG. 1, suppress the corrosion of the back electrode 3 and the connection line 12, and improve the environmental resistance. it can.

[0021]

As described in detail above, the solar cell module of the present invention can suppress corrosion of the back electrode and the connection wire, and exhibits excellent environmental resistance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a thin-film solar cell module according to the present invention.

FIG. 2 is a cross-sectional view of a crystalline solar cell module according to the present invention.

FIG. 3 is a cross-sectional view of another thin-film solar cell module according to the present invention.

FIG. 4 is a cross-sectional view of a conventional thin-film solar cell module.

FIG. 5 is a cross-sectional view of a conventional crystalline solar cell module.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Surface cover glass 2 ... Thin film type solar cell 3 ... Back surface electrode 4 ... Output lead wire 5 ... Filler 6, 13 ... Back surface sealing material 6a ... Metal foil 6b ... Insulating film 7 ... Terminal 8 ... Output lead Line 9: Terminal box 11: Crystalline solar cell 12: Connection line

Claims (3)

[Claims] 1. A transparent substrate, a solar cell provided on the back side of the transparent substrate, an output line connected to the solar cell, a filler for sealing the solar cell, A back surface sealing material provided on the back surface of the filler, wherein the output lead-out line is routed from the inside of the filler to the back surface side of the back surface sealing material through an output outlet portion, A solar cell module, wherein the filler at the take-out portion is not in direct contact with the outside air. 2. The output lead line is formed to extend along the back surface of the solar cell module, and an extension of the output lead line is covered with a back surface sealing material. Solar module. 3. The solar cell module according to claim 2, wherein a laminated structure including a back surface sealing material, an output line, and a back surface sealing material is formed at an extension of the output lead line. .