JP2000332284A - Solar cell module - Google Patents

Abstract

(57) [Summary] [Problem] Poor work efficiency when providing an extraction electrode,
There is also a problem that it is difficult to respond to automation. SOLUTION: A plurality of solar cell elements connected by inner lead wires between a light transmitting member and a back member are arranged and adhered by a light transmitting adhesive, and the solar cell element is attached to the back side of the solar cell element. A solar cell module provided with an extraction electrode for extracting an output of a solar cell element, wherein an opening is formed in the back member, and the extraction electrode is formed such that a part of the extraction electrode is exposed from the opening. And a moisture-proof member and a translucent adhesive were disposed between the extraction electrode and the solar cell element at the opening.

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, and more particularly to a solar cell module having a feature in a structure for taking out electrodes of a solar cell.

[0002]

2. Description of the Related Art A conventional solar cell module is shown in FIGS. FIG. 4 is a sectional view, and FIG. 3 is a sectional view showing an exploded state. 3 and 4, 1 is a translucent member made of glass or the like, 2 is a solar cell element, 4 is a translucent adhesive, and 5 is a back member. Solar cell module M
Is constituted by connecting a plurality of solar cell elements 2 having electrodes formed on the front and back surfaces by inner lead wires 7, sandwiching between the light transmitting member 1 and the back member 5, and bonding with the light transmitting adhesive 4. Have been.

It is necessary to take out the output of the solar cell element 2 to the outside of the solar cell module M. As shown in FIG.
The cutout 6 is provided in the back member 5 and the translucent adhesive 4 on the back side, and the extraction electrode 3 connected to the solar cell element 2 is drawn out of the solar cell module M from the cutout 6. Although not shown, a terminal box is attached to the extraction electrode 3 and connected to an external circuit in the terminal box.

[0004]

However, in this conventional solar cell module, a cutout 6 is provided in the back member 5 and the translucent adhesive 4 on the back side, and the electrode 3 is taken out from the cutout 6 and the solar cell is removed. Although provided so as to be drawn out of the module M, after laminating the translucent member 1, the solar cell element 2, the translucent adhesive 4 and the back member 5,
The extraction electrode 3 must be manually pulled out through the cutout 6 by hand. For example, if the cutout 6 of the back member 5 is bent and raised, the solar cell element 2 is displaced or damaged, and the back member 5 is pulled out. There is a problem that bending of the lead electrode or deformation of the extraction electrode 3 may occur.

[0005] Further, there is a problem in that the work of passing the extraction electrode 3 through the cut portion 6 becomes complicated, so that the work load is increased and the production efficiency is reduced. Since the operation of passing the extraction electrode 3 through the cutout 6 requires a complicated operation, it is difficult to perform automation.

When the back member 5 is made of a conductive base material such as aluminum foil, the front and back surfaces of which are coated with a fluorine resin, the conductive base material is exposed at the cutout 6 and Failure may occur. Therefore, an insulating sheet 8 must be laid below the cut portion 6 to ensure insulation performance between the back member 5 and the solar cell element 2 and the extraction electrode 3. That is, the cutout 6 whose cross section is exposed must be sealed and protected by the terminal box and the filler so as to be completely covered.

Further, when a conductive base material such as an aluminum foil is used for the back member 5, it is necessary to perform a dielectric breakdown test.
It is necessary to perform an operation such as applying a resin to the broken portion to prevent water from entering, which causes a problem of lowering production efficiency.

The present invention has been made in view of such a problem of the conventional device, and an object of the present invention is to provide a solar cell module which solves the problem of the conventional device in that the work efficiency at the time of attaching the extraction electrode is poor. Aim.

[0009]

In order to achieve the above object, in a solar cell module according to the present invention, a plurality of solar cell elements connected by an inner lead wire between a translucent member and a back member are arranged. And a solar cell module provided with an extraction electrode for extracting the output of the solar cell element on the back side of the solar cell element, wherein an opening is formed in the back member. The extraction electrode is provided so that a part of the extraction electrode is exposed from the opening, and a moisture-proof member and a light-transmissive adhesive are provided between the extraction electrode and the solar cell element in the opening. It is characterized by being arranged.

[0010]

The opening is formed in the back member as described above.
When an extraction electrode is provided so that a part of the extraction electrode is exposed from the opening, and an insulating member and a translucent adhesive are provided between the extraction electrode and the solar cell element in the opening, reliability is improved. The manufacturing process can be simplified without lowering the manufacturing cost. That is, in the production of the solar cell module, there is no significant change in the material and the like, the process of each member is only the stacking by lamination only by the change of the structure, and the automation can be dealt with only by the simplified operation.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a solar cell module according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of an essential part showing one embodiment of a solar cell module of the present invention, wherein 1 is a translucent member, 2 is a solar cell element, 3 is an extraction electrode, 4 is a translucent adhesive, and 5 is A back member, 6a is an opening, and 7a is a moisture-proof member.

As the translucent member, glass or polycarbonate resin is used. Examples of the glass include white plate glass, tempered glass, double tempered glass, and heat ray reflective glass. Normally, a glass having a thickness of about 3 mm is used, but when wind resistance is required, a thick glass is used as necessary. In the case of polycarbonate resin, the thickness is 5
Use the one of about mm.

As the back member 5, for example, a member in which the front and back surfaces of an aluminum foil are coated with a fluorine resin or the like is used.

As the translucent adhesive 4, for example, a transparent EV
A resin is used. As the transparent EVA resin, an ethylene / vinyl acetate copolymer having a vinyl acetate content of 20 to 40% and a thickness of about 0.5 to 1 mm is used.

The solar cell element 2 comprises a solar cell element using crystalline silicon. A solar cell element using this crystalline silicon has, for example, a structure in which a pn junction is provided in a silicon substrate, electrodes are formed on the front and back surfaces, and an antireflection film is provided on a light receiving surface. The connection of a plurality of solar cell elements is performed by connecting the front electrode and the back electrode of the adjacent solar cell element with an inner lead wire.

In manufacturing the solar cell module M, a light-transmitting adhesive 4 on the front side, a plurality of solar cell elements 2 connected by inner lead wires, and a light-transmitting side on the rear side are formed on the light transmitting member 1. The optical adhesive 4 and the back member 5 are sequentially laminated and arranged. In such a state, it is put in a decompression container and applies external pressure at 100 to 200 ° C., for example, for 15 minutes to
Produced by heating for 1 hour. Translucent adhesive 4
Are formed so as to wrap around between the plurality of solar cell elements 2 when heated and completely expel bubbles and the like that cause corrosion of the inner lead wire. .

An opening 6a is formed in the translucent adhesive 4 and the back member 5 on the back side. The opening 6a is formed in a rectangular shape of, for example, about 4 cm × 7 cm, and is smaller than the size of the terminal box placed thereon. The extraction electrode 3 is arranged such that a part of the extraction electrode 3 of the solar cell element 2 is exposed from the opening 6a. The extraction electrode 3 is made of a conductive member such as a copper plate. A moisture-proof member 7a and a light-transmissive adhesive 4a are disposed between the extraction electrode 3 and the solar cell element 2 in the opening 6a. The moisture-proof member 7a is made of, for example, an aluminum foil or the like whose front and back surfaces are coated with a fluororesin. As described above, when the moisture-proof member 7a having the same moisture-proof property as the rear member 5 is provided in the opening 6a, long-term reliability of the solar cell module can be secured. The translucent adhesive 4a is made of the same transparent EVA resin as the translucent adhesive 4. The opening 6a is not limited to a rectangular shape, but may be a polygonal shape or a circular shape.

The light-transmitting adhesives 4 and 4a are once liquefied by heat treatment and become solid, and at the same time, the light-transmitting member 1, the solar cell element 2, the back member 5, the insulating sheet 7a
Are respectively bonded.

At this time, as shown in FIG. 2, the extraction electrode 3 is exposed from the opening 6a. However, the size of the opening 6 a must be smaller than the size covered by the terminal box, and the size must be such that the pad portion of the extraction electrode 3 is not covered by the translucent adhesive 4 or the back member 5. Also,
When inspecting the insulation of the back member 5, an inspection tension is pierced into the back member 5, and after the inspection is completed, the moisture proof member 5 inside the terminal box is inserted.
Are all independent insulating members. Therefore, FIG.
As shown in FIG. 5, an insulation test tab 5b extended from the back member 5 is provided in a portion that does not interfere with the extraction electrode 3, and the tab 5b is pierced with an inspection needle. When the transparent adhesive is filled, it can be closed at the same time.

Here, the translucent adhesive 4 and the back member 5 have a maximum thickness of about 1 mm, and are usually supplied in a roll state. By punching the opening 6a at the same time when the sheet is punched by a punching die, the productivity in material processing does not decrease. Each material is a translucent member 1
Based on this, it is possible to form a finished product simply by stacking in order. In other words, as in the manufacturing process, it is not necessary to pass the extraction electrode 3 through the notch 6 as in the related art, and it is possible to cope with the problem by simply stacking and transporting by an automatic machine or an unmanned machine. A terminal box is adhered to the periphery of the opening 6a with an adhesive, and the inside of the terminal box is filled with a filler. At this time, since the opening 6a of the back member 5 and the translucent adhesive 4 is smaller than the terminal box, the filling of the filler allows the opening 6a to be sealed, thereby ensuring reliability. it can.

[0021]

As described above, according to the solar cell module of the present invention, the opening is formed in the back member, and the extraction electrode is provided so that a part of the extraction electrode is exposed from the opening. Since the insulating member and the translucent adhesive are disposed between the extraction electrode and the solar cell element in the opening, each member can be set in a stacked manner in the manufacturing process of the solar cell module. become. Therefore, there is no need for a complicated operation process such as passing the output electrode through the back member or the cutout of the translucent adhesive as in the conventional solar cell module manufacturing process, and by introducing an automatic machine having a laminating function. Production efficiency can be improved while ensuring reliability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing one embodiment of a solar cell module according to the present invention.

FIG. 2 is a view of the extraction electrode portion of the solar cell module according to the present invention as viewed from the back surface side.

FIG. 3 is an exploded sectional view showing a conventional solar cell module.

FIG. 4 is a cross-sectional view showing a conventional solar cell module.

FIG. 5 is a cross-sectional view showing a main part of a conventional solar cell module.

[Explanation of Signs] 1 {Transparent member, 2} Solar cell element, 3}
Extraction electrode, 4 ‥‥‥ translucent adhesive, 4a ‥‥‥ translucent adhesive at opening, 5 ‥‥‥ rear member, 6a ‥‥‥ opening, 7a ‥‥‥ moistureproof member

Claims (1)

[Claims] 1. A plurality of solar cell elements connected by inner lead wires between a light-transmitting member and a back member are arranged and adhered by a light-transmitting adhesive, and are attached to the back side of the solar cell element. In a solar cell module provided with an extraction electrode for extracting the output of the solar cell element, an opening is formed in the back member, and the extraction electrode is formed such that a part of the extraction electrode is exposed from the opening. A solar cell module, wherein a moisture-proof member and a translucent adhesive are provided between the take-out electrode and the solar cell element in the opening.