JP2000315812A - Solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase reliability on streses due to tension of an output wire or the like in a solar battery module, in which a translucent plate is arranged on a light receiving face, and a solar battery element which is sealed in translucent resin is arranged at the lower face side. SOLUTION: A solar battery element 1 and a metal thin plate 3 are sealed in a translucent resin 6, and the metal thin plate 3 in electrically connected between the solar battery element 1 and an output wire 4. Even if a large tensile force is applied to the output wire 4, the tensile force is supported by the metal thin plate 3 and the translucent resin 6 in which the metal thin plate 3 is sealed, so that a large tensile force can be prevented from bring applied directly to the solar battery element 1, and reliability with respect to streses due to the tension of the output wire 4 can be increased.

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 light-transmitting plate is disposed on a light-receiving surface, and a solar cell element sealed in a light-transmitting resin is disposed on the lower surface thereof.

[0002]

2. Description of the Related Art A so-called super straight type, a filling type or a resin potting type in which a light-transmitting plate is disposed on a light-receiving surface and a solar cell element sealed in a light-transmitting resin is disposed on a lower surface side thereof. There is a solar cell module. For example, what is called a filling type or a resin potting type is, as shown in FIG. 4, a plurality of solar cell elements b electrically connected in series or in parallel by an interconnector a from a plastic resin or the like. A light-transmitting resin e is sealed in the lower housing portion d of the light-transmitting plate c, and an output wire f electrically connected to the solar cell element b is exposed to the outside from the light-transmitting resin e. Light such as sunlight passes through the light transmitting plate c and the solar cell element b
And an electromotive force is generated in the solar cell element b by the incident light, and the electromotive force can be taken out from the output wire f.

[0003]

In such a solar cell module, as shown in the figure, the output wire f is connected to the solar cell element b for simplicity as a method of electrically connecting the output wire f to the solar cell element b. Generally, a method in which solder g is directly attached to b and joined is adopted. However, in the case where the output wire f is directly soldered to the solar cell element b, there are the following problems.

That is, when an excessive tensile force is applied to an output wire at the time of assembling a final product using the solar cell module, since the translucent resin enclosing the solar cell element is relatively soft, the tensile force is reduced by soldering. It may be directly applied to the joint, and the solder joint may come off, or the solar cell element may be cracked. Also, since the pulling force of the output wire is directly applied to the solder joint, if the final product using this solar cell module is installed in a place that is exposed to vibrations due to a car, wind pressure, etc. Is always exposed to stresses such as pulling by the output wire, which may cause a problem in reliability.

Therefore, the present invention solves the above-mentioned problems,
It is an object of the present invention to provide a solar cell module with high reliability against stress caused by pulling of an output wire or the like.

[0006]

In order to achieve the above object, the present invention has the following arrangement. That is, in the solar cell module according to the present invention, a plurality of solar cell elements electrically connected in series or in parallel by an interconnector are sealed in a light-transmitting resin, and a light-transmitting plate is disposed thereon. An output wire electrically connected to the solar cell element is exposed to the outside from the translucent resin, and power is generated in the solar cell element by light incident on the solar cell element through the light transmitting plate. A solar cell module capable of being taken out of the output wire through the output wire, wherein a thin metal plate is sealed in a translucent resin together with the solar cell element, and the thin metal plate is electrically connected between the solar cell element and the output wire. It is characterized by the fact that the connection is made.

According to the present invention, since the thin metal plate sealed in the translucent resin together with the solar cell element is electrically connected between the solar cell element and the output wire, the output wire is large. Even when a tensile force is applied, the tensile force is supported by the thin metal plate and the translucent resin in which the metal sheet is sealed, so that a large tensile force is not directly applied to the solar cell element, and the stress caused by the pulling of the output wire, etc. Reliability can be improved.

[0008]

Next, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view of a main part of FIG. 1, and FIG. 3 is a sectional view showing another embodiment of the present invention.

In the drawings, reference numeral 1 denotes a solar cell element;
The plurality of solar cell elements 1 are arranged with the same polarity on the front side, and the front side and the back side of the adjacent solar cell elements 1 are electrically connected by the interconnector 2, that is, connected in series. ing.

Reference numeral 3 denotes a thin metal plate disposed below and parallel to the solar cell element 1. The thin metal plate 3 is electrically connected to an interconnector 2 electrically connected to the solar cell element 1 at a solder joint 11, and the base end of the output wire 4 is further connected to the thin metal plate 3 by soldering or the like. It is electrically connected. Thus, the metal thin plate 3 is electrically connected between the solar cell element 1 and the output wire 4. The thickness of the metal thin plate 3 is not particularly limited, but the reason for using the thin plate is to make the overall thickness of the solar cell module as thin as possible, and the metal thin plate 3 increases the overall thickness and improves the tensile force. The thickness of the metal sheet 3 may be determined in consideration of the above.

Reference numeral 5 denotes a light-transmitting plate formed of a synthetic resin such as polycarbonate, glass, or the like. The light-transmitting plate 5 is formed in a case shape with an open lower part, and a storage portion 51 is provided. Translucent resin 6 such as silicone inside
Is filled, and the solar cell element 1 and the thin metal plate 3 are sealed in the translucent resin 6 in a state where the tip of the output wire 4 is exposed outside from the translucent resin 6. When light such as sunlight passes through the light transmitting plate 5 and is incident on the solar cell element 1, an electromotive force is generated in the solar cell element 1 by the incident light, and the electromotive force is generated by the interconnector 2 and the interconnector 2. It can be taken out from the output wire 4 through the metal thin plate 3.

In this embodiment, as shown in the drawing, since each solar cell element 1 is connected in series, the output wire 4
Are provided one each on the plus side and the minus side, and correspondingly, one metal sheet 3 is provided on the plus side and the minus side, respectively. As described above, it is preferable that the metal thin plate 3 is provided on all the output wires 4, but the metal thin plate 3 may be provided only on the output wire 4 to which a tensile force is particularly applied. The solar cell elements 1 connected by the interconnector 2 may be connected in parallel, or may be connected in a combination of series and parallel. Also, the number of output wires 4 may be other than two, and the number is not particularly limited.

In the present embodiment, the insulating tape 31 is interposed between one of the two thin metal plates 3 and the solar cell element 1 located above the two thin metal plates 3. Prevents electrical shorts.

The thin metal plate 3 is preferably made of copper or its alloy, which has good adhesion to solder and the like and is excellent in conductivity and corrosion resistance, and is tin-plated. It may be made of metal.

Further, instead of the insulating tape 31 for preventing short circuit between the metal thin plate 3 and the solar cell element 1, the solar cell element 1
The electric insulating layer 32 may be formed by applying a synthetic resin such as Teflon, polyimide, polyester, or another insulating material to the surface side of the metal thin plate 3 opposed to the above.

The plurality of solar cell elements 1 in the above embodiment are arranged with the same polarity on the front side, that is, with all the solar cell elements 1 having the positive or negative polarity on the front side. As a result, the front side and the back side of the adjacent solar cell elements 1 are electrically connected to each other so that they are connected in series. As another method of connecting in series, as shown in FIG. The polarities on the surface side of adjacent solar cell elements 1 are different from each other, that is, the polarities on the surface side of adjacent solar cell elements 1 are positive,
You may arrange so that it may become minus, plus, minus. In this way, the interconnector 2 only needs to electrically connect the front side and the front side and the back side and the back side of the adjacent solar cell elements 1, respectively. The interval between the elements 1 can be reduced, the length of the interconnector 2 between the solar cell elements 1 can be reduced, and the connection work of the solar cell elements 1 becomes easy.

Next, Table 1 shows that the metal sheet 3 is a solar cell element 1
An embodiment in which the solar cell module according to the present invention is electrically connected between the solar cell module and the output wire 4, and a conventional solar cell module in which the output wire is directly soldered to the solar cell element without using a thin metal plate. 13 shows the measurement results of a tensile test performed on each output wire, with the comparative example manufactured.

The conductor size of the output wire used is:
The output wires of each Example and Comparative Example were pulled at 0.45 kgf and 0.75 kgf for 20 seconds using AWG26 (0.14 square mm) with five samples. The reason for pulling at 0.45 kgf and 0.75 kgf is that the output wire preferably withstands a pulling force of about 5 N (0.51 kgf) according to the JIS standard for electronic components. Pulled by force.

[0019]

[Table 1]

As shown in Table 1, a tensile force of 0.7
At 5 kgf, in the example, there was no problem in all five samples, but in the comparative example, the translucent resin partially peeled in all five samples, and four of the samples were in the solar cell module. Air bubbles were generated, and cracks occurred in the solar cell element of the remaining one sample.

As described above, the solar cell module according to the present invention in which the thin metal plate 3 is electrically connected between the solar cell element 1 and the output wire 4 does not use the thin metal plate but connects the output wire to the solar cell element. Is less susceptible to stress due to the pulling of the output wire and the like, as compared with a conventional solar cell module directly soldered.

[0022]

According to the present invention, since the thin metal plate sealed together with the solar cell element in the translucent resin is electrically connected between the solar cell element and the output wire, the output wire Even when a large tensile force is applied to the solar cell element, the tensile force is supported by the thin metal plate and the translucent resin in which the metal sheet is sealed. It is possible to enhance reliability against stress due to pulling or the like.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solar cell element 11 Solder joint part 2 Interconnector 3 Metal thin plate 31 Insulating tape 32 Electric insulating layer 4 Output wire 5 Translucent plate 51 Housing part 6 Translucent resin

Claims (4)

[Claims] 1. A plurality of solar cell elements electrically connected in series or in parallel by an interconnector are enclosed in a light-transmitting resin, a light-transmitting plate is disposed above the solar cell elements, and electric power is supplied to the solar cell elements. The connected output wire is exposed to the outside from the translucent resin, generates power in the solar cell element by light incident on the solar cell element through the light transmitting plate, and outputs the power from the output wire. A solar cell module capable of being taken out to the outside, wherein a thin metal plate is sealed in a translucent resin together with a solar cell element, and the thin metal plate is electrically connected between the solar cell element and an output wire. A solar cell module. 2. The solar cell module according to claim 1, wherein the metal sheet contains copper as a component. 3. The solar cell module according to claim 1, wherein the metal thin plate has an electric insulating layer formed on one surface thereof. 4. The solar cell module according to claim 1, wherein the plurality of solar cell elements are arranged so that the polarities on the surface side of adjacent solar cell elements are different from each other. .