JP2000277784A - Solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery module which can ensure reliability over a long period, by improving the efficiency of the solar battery module. SOLUTION: This solar battery module in which a plurality of solar battery elements 1 are connected with each another by lead wires 2 for mutual connection, and electric output is extracted out to the outside by a lead wire 3. In this case, at least either the lead wire 2 for mutual connection or the lead wire 3 for output extracting is constituted of a wire 5 made of a twisted wire. Hereby, the solar battery module can be made compact, and efficiency can be improved, and reliability over a long period can be secured, and the manufacturing cost is reduced also.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell module in which a plurality of arranged solar cell elements are connected to each other by an interconnection lead, and an electric output is taken out by an output lead. Things.

[0002]

2. Description of the Related Art A conventional solar cell module of this kind is disclosed, for example, in Japanese Patent Laid-Open Publication No.
No. 195071, the interconnection lead wires for connecting the solar cell elements and the output lead wires are solder-plated rectangular copper wires as shown in FIG. Has been adopted. Since the interconnection lead wire 10 is sealed with resin together with the solar cell element 11, a rectangular copper wire having a thickness equal to or less than the thickness of the solar cell element 11 is used. The illustrated interconnect lead wire 10 is a flat copper wire having a thickness of about 0.1 mm and a width of about 2 mm, and the output lead wire 12 has a thickness of 0.3 mm and a width of 5 m.
It is a rectangular copper wire of about m.

Since the interconnection lead 10 and the output lead wire 12 cannot be bent in a plane, as shown in FIG. 6, the interconnection lead 10 and the output lead lead 12 are connected to each other. Composed of separate parts and soldered 1
3 are connected. The output lead wire 12 needs to be routed to the center from the end of the solar cell module in order to take out the electric output from the back surface of the solar cell module to the outside. In this case, as shown in FIG. It is folded 90 degrees in the thickness direction by soldering 13 or bending 14. At that time, in order to ensure insulation between the output / output lead wire 12 and the solar cell element 11, an insulating sheet was attached between the output / output lead wires 12 and the solar cell element 11.

[0004]

An interconnect lead 10 and an output lead 12 are made of a rectangular copper wire as described above.
In the solar cell module using the solar cell module, since the interconnecting lead wire 10 connecting the solar cell elements 11 cannot be bent with a small radius, the interval between the solar cell elements 11 is widened, and the outer dimensions of the solar cell module are large. In addition, there is a problem that a large installation space is required and power generation efficiency is suppressed. That is, as shown in FIG.
Although the connection is made in an S-shape, thermal stresses due to temperature changes in the actual use environment are repeatedly applied to the two bent portions in opposite directions, so that a bending radius as small as a plate thickness cannot be obtained.
This inevitably increases the distance between the solar cell elements 11. If the bending radius is forcibly reduced, the interconnecting lead wire 10 will be cracked or broken due to the repeated thermal stress, and the output will be reduced. Further, the insulating sheet inserted between the output / output lead wire 12 and the solar cell element 11 is displaced due to melting of the sealing resin in the laminating step, and causes insulation failure between the two.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. An object of the present invention is to improve the efficiency of a solar cell module, and to provide a solar cell having a long-term reliability. It is to obtain a module, and to reduce the manufacturing cost of a solar cell module.

[0006]

According to a first aspect of the present invention, a plurality of solar cell elements arranged are connected to each other by an interconnect lead, and an external lead is provided by an output lead. For a solar cell module adapted to take out an electrical output, a means is adopted in which at least one of the interconnection lead and the output take-out lead is constituted by a stranded wire made by attaching element wires.

In order to achieve the above object, a second aspect of the present invention employs a means for making the twisted wires in the first aspect of the invention thin and flat.

In order to achieve the above object, a third aspect of the present invention adopts a means in which the stranded wire according to the second aspect of the present invention is constituted by a strand plated with tin or solder.

In order to achieve the above object, a fourth aspect of the present invention employs a means for applying an insulating coating to a stranded wire in the above-mentioned means according to any one of the first to third aspects.

In order to achieve the above object, the invention according to claim 5 employs means for applying an insulating coating to the stranded wire in the means according to any one of claims 1 to 3 at predetermined intervals. I do.

According to a sixth aspect of the present invention, in order to achieve the above object, the output lead wire in the means according to any one of the first to third aspects is configured by applying an insulating coating to a stranded wire. At the same time, a means for drawing out a predetermined length from the end surface or the back surface and adopting means for electrically connecting this output extraction lead wire and the output extraction lead wire of another solar cell module via the main lead wire is adopted. .

In order to achieve the above object, a seventh aspect of the present invention employs a means for forming an output extraction lead by the interconnection lead in the means according to any one of the first to sixth aspects. I do.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. In the present embodiment shown in FIGS. 1 to 5, a plurality of solar cell elements 1 arranged as shown in FIG. 1 are connected to each other by an interconnecting lead wire 2 and output to the outside by an output lead wire 3. The present invention relates to a solar cell module for taking out an electric output. The solar cell module shown in FIG. 2 in which an interconnection lead 2 for connecting solar cell elements 1 and an output extraction lead 3 are attached with a tin-plated or solder-plated element wire 4. It is constituted by a stranded wire 5 as shown.
The stranded wire 5 may be formed into a thin flat rectangular shape shown in FIG. 2C rather than the round hollow wire or the round wire shown in FIGS. 2A and 2B in the laminating step at the time of module production. This is more suitable because the element 1 does not crack.

The interconnecting lead wire 2 is formed by crushing the stranded wire 5 shown in FIGS. 2A and 2B into a rectangular shape having a width of about 2 mm and a thickness of about 0.1 mm as shown in FIG. 2C. . In addition, the output take-out lead wire 3 is formed by converting the stranded wire 5 shown in A or B of FIG. 2 to a width 5 mm and a thickness 0.3 mm as shown in FIG.
It is formed by crushing into a rectangular shape.

As shown in FIG. 3, adjacent solar cell elements 1 are connected by interconnecting lead wires 2 bent in an S shape. The interconnection lead 2 composed of the stranded wire 5
Even if a thermal stress accompanying a temperature change in an actual use environment is repeatedly applied to two bent portions 6 having high flexibility and opposite directions, this can be reduced. For this reason, the bending radius can be made smaller than before, and thereby the interval between the solar cell elements 1 can be made smaller. The output lead wire 3 is provided with an insulating coating 7, and one end of the interconnection lead wire 2 extending from the solar cell element 1 at the end is connected by soldering 8 (see FIG. 1).
Before the soldering 8 of the interconnecting lead wire 2, the insulating coating 7 of the relevant portion of the output lead wire 3 is removed, but as shown in FIG. 5, the insulating coating 7 is applied in advance at a predetermined interval. By doing so, the workability of soldering 8 can be improved.

The output lead wire 3 is drawn out at a predetermined length from the end face or the back face of the solar cell module for connection to another solar cell module. FIG.
In the case of drawing out from the back surface as shown in FIG. The insulating coating 7 at the end of the drawn output lead wire 3 is removed, a connector (not shown) is caulked, and a connector of another output lead wire of the solar cell module is connected to a main lead wire (not shown). The terminal can be electrically connected without a terminal box. The stranded wire 5 has a high resistance to bending, and can be bent in the plane or in the thickness direction as shown in FIG. Since the output lead wire 3 is provided with the insulating coating 7, an insulating material for preventing a short circuit between the output lead wire and the solar cell element and between the output lead wires, which has been conventionally performed. No mounting is required,
The workability of the assembly work is improved. Further, the problem of insulation failure due to the displacement of the insulating material can be solved, and the reliability can be improved.

Since the stranded wire 5 can be bent in the plane or in the thickness direction, the wiring direction can be freely changed with a single stranded wire 5, and as shown in FIG. Can be used to form the output lead wire 3, whereby the soldering 8 and the number of components can be greatly reduced, and the production cost can be reduced. That is, this solar cell module can be reduced in size, has high efficiency, and can secure long-term reliability.

[0018]

According to the first aspect of the present invention, the size and efficiency of the solar cell module can be improved, long-term reliability can be secured, and the manufacturing cost can be reduced.

According to the second aspect of the present invention, the productivity according to the first aspect and the productivity are improved.

According to the third aspect of the present invention, productivity is further improved in addition to the effect of the second aspect.

According to the fourth aspect of the present invention, in addition to the effects according to any one of the first to third aspects, the assemblability can be improved, the cost can be reduced, and the productivity can be improved by ensuring reliability. I do.

According to the fifth aspect of the present invention, in addition to the effects according to any one of the first to third aspects, the assemblability can be improved and the cost can be reduced.

According to the sixth aspect of the present invention, it is possible to promote cost reduction together with the effect according to any one of the first to third aspects.

According to the seventh aspect of the present invention, it is possible to further reduce the cost together with the effect according to any one of the first to sixth aspects.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a solar cell module according to an embodiment.

FIG. 2 is a perspective view showing stranded wires used for wiring of the solar cell module according to the embodiment.

FIG. 3 is a cross-sectional view showing a wiring configuration of an interconnection lead of the solar cell module according to the embodiment.

FIG. 4 is a plan view showing another mode of the output lead wire of the solar cell module according to the embodiment.

FIG. 5 is an explanatory diagram showing a bent form of a stranded wire used in the solar cell module of the embodiment.

FIG. 6 is a perspective view showing a configuration of a conventional solar cell module.

FIG. 7 is a perspective view showing a configuration of a conventional interconnection lead and an output extraction lead of a solar cell module.

FIG. 8 is a cross-sectional view showing a wiring configuration of a lead wire for interconnection of a conventional solar cell module.

[Explanation of symbols]

1 solar cell element, 2 lead wire for interconnection, 3
Output lead wire, 4 strands, 5 strands, 7
Insulation coating.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Takada 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Junichi Yasuda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. F-term (reference) 5F051 JA06

Claims (7)

[Claims] 1. A solar cell module in which a plurality of arranged solar cell elements are connected to each other by an interconnection lead, and an electric output is taken out by an output lead. A solar cell module in which at least one of the lead wire for output and the output lead wire is constituted by a stranded wire formed by attaching a strand. 2. The solar cell module according to claim 1, wherein the stranded wires are formed into a thin plate shape. 3. The solar cell module according to claim 2, wherein the stranded wires are made of strands plated with tin or solder. 4. The solar cell module according to claim 1, wherein the stranded wire is provided with an insulating coating. 5. The solar cell module according to claim 1, wherein the stranded wires are provided with insulation coating at predetermined intervals. 6. The solar cell module according to any one of claims 1 to 3, wherein the output take-out lead wire is formed by applying insulation coating to the stranded wire, and the output take-out lead wire has a predetermined shape from an end face or a back face. A solar cell module which is drawn out by a length and electrically connected to this output extraction lead wire and the output extraction lead wire of another solar cell module via the main lead wire. 7. The solar cell module according to claim 1, wherein the output lead comprises an interconnect lead.