JP3591223B2 - Solar cell module - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flexible solar cell having a connection portion between an internal wiring and an external lead wire, the connection portion being covered and sealed by a covering member.
[0002]
[Prior art]
A flexible type solar cell using a flexible substrate is expected to have high practicality because high productivity can be realized by a roll-to-roll method or a stepping roll method. In addition, since it is lightweight and flexible, it can be installed on a surface of any shape, and since it can be long, it is particularly advantageous to install it on a roof of a large-area house or the like. Since such a solar cell is installed outdoors, it is sealed with a protective sheet to form a solar cell module. 5A and 5B show a solar cell module, wherein FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view along XX in FIG. A main wiring 2 disposed on both sides of a solar cell 1 having a photoelectric conversion unit formed on a flexible substrate is connected to an output electrode of each solar cell 1 via a sub wiring 3. 1 are connected in parallel. These are sealed with a sealing film 41 made of a heat-adhesive resin such as ethylene vinyl acetate (hereinafter referred to as EVA), and further covered with a weather-resistant film 42 such as ethylene tetrafluoride polymer (hereinafter referred to as ETFE). Is done. Hereinafter, the lamination of the sealing film 41 and the weather-resistant film 42 will be collectively referred to as the protective film 4. The protective film 4 is cut between the solar cells so as to include a plurality of solar cells, and is made into a solar cell module. The cut surface of the main film is exposed on the cut surface of the protective film 4.
[0003]
FIG. 6 is an exploded perspective view showing a conventional external lead wire connecting portion to a solar cell module and a covering member.
First, the protective film at the end of the solar cell module is cut and removed using both an ultrasonic cutter and a sharp blade such as a knife to expose the end of the main wiring 2. The wire 5a of the external lead wire 5 is connected to the end of the main wiring 2 by soldering. A portion of the wire 5a that is not covered in the subsequent steps is covered with a heat-shrinkable tube 5b. And the connection part and the peripheral part were covered with the covering member 6s. As the covering member 6s, a fluororesin film was adhered with an adhesive, or a film of another ethylene propylene diene monomer (hereinafter referred to as EPDM) or the like was adhered with an adhesive 7 (for example, a silicone adhesive).
[0004]
[Problems to be solved by the invention]
Since such a solar cell module is in the form of a flexible film, it is difficult to maintain mechanical strength, waterproofness, and reliability when connected to a deformed external lead wire. Therefore, it is necessary to reinforce the connection part. Conventionally, for example, when a silicone adhesive is used, the penetration of moisture from the end can be prevented.However, since the external lead wire is weak, the main wiring may be pulled and the main wiring may be cut off. There was a problem that the installation work of the module was not easy.
[0005]
In view of the above problems, an object of the present invention is to provide a solar cell module having a connection portion with an external lead having a high tensile strength of an external lead, a good installation workability, and a high weather resistance. is there.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, main wiring is arranged on both sides of one or more solar cells, each solar cell and the main wiring are connected by a sub wiring, and these are sealed by a protective film. It will, at the end of the protective film is connected a main wiring and the external lead wire Rutotomoni, at least in the connecting portion and a solar cell module sealed coated sealing its periphery by a double-sided from the covering member of the solar cell module, wherein The covering member has a higher mechanical strength than the protective film, is adhered to the protective film by an adhesive, and penetrates through the through holes of the protective film opened on both sides of the main wiring. It shall be fixed by a penetrating member having high strength.
[0007]
The penetrating member may be made of the same material as the covering member.
It is preferable that the surface of the covering member facing the solar cell module is provided with a projection that fits into each other, and a concave portion or a hole.
Preferably, the penetrating member is a rivet made of a corrosion-resistant metal.
The penetrating member may be made of the adhesive.
[0008]
The covering member is preferably made of soft vinyl, hard vinyl chloride, acrylic resin, polycarbonate resin, polyester resin or epoxy resin.
The adhesive is preferably a silicone adhesive.
The covering member is formed by bending a single plate, and a hole for passing the external lead wire is formed in a bent portion, and the inside of the bent portion is preferably opposed to an end of the solar cell module. .
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the present invention, the covering member is adhered to both surfaces of the solar cell module with an adhesive and further secured by the penetrating member penetrating through the holes of the protective film formed on both sides of the main wiring. Since the members are directly fixed, the mechanical strength is higher than that of the conventional solar cell module via the protective film. In particular, if the mechanical strength of the covering member and the penetrating member is higher than that of the protective film, the mechanical strength of fixing is higher, and the resistance to pulling of the external lead wire is higher.
[0010]
As a material of such a covering member, an acrylic resin, a polycarbonate resin, a polyester resin, or an epoxy resin can be used in addition to the vinyl chloride used in the embodiments. These materials have good insulation properties and are also excellent in weather resistance.
When the penetrating member is a metal, a corrosion-resistant metal is used, so that damage to the seal does not start from the penetrating member.
[0011]
Further, the silicone adhesive has high weather resistance, and can be expected to have a long life when the solar cell module is left outdoors.
Example 1
FIG. 1 is an exploded perspective view showing an embodiment of fitting of a covering member according to the present invention.
Except for the covering member, the solar cell module already described with reference to FIG. 6 was also used in the example according to the present invention. The protective film is an EVA sealing sheet having a thickness of 0.45 to 0.5 mm and a PET weatherproof film, and the main wiring is made of Sn / Cu / Sn material having a thickness of 0.05 to 0.25 mm and a width of 10 mm. Metal foil was used. The auxiliary wiring was a 10 mm wide tape in which a conductive adhesive was attached to a laminate of a PET film having a thickness of 0.12 to 0.38 mm and aluminum having a thickness of 0.03 to 0.3 mm.
[0012]
First, a through-hole 4h having a diameter of 5 mm was opened on both sides of the main wiring 2 at the end of the protective film 4 of the solar cell module, at a distance of about 3 mm. Then, in the same manner as in the related art, the main wiring 2 was removed while being heated and softened by using a protective film L-shaped heating jig at the end of the main wiring 2 to expose the end of the main wiring 2. The wire 5a of the external lead wire 5 was connected thereto by soldering. The portion of the wire 5a that was not covered in the subsequent steps was covered with a heat-shrinkable tube 5b.
[0013]
Two 30 mm square vinyl chloride plates having a thickness of 5 mm are prepared as covering members. One covering member 6a is provided with a cylindrical protrusion 6p having a diameter of 5 mm and a height of 1 to 1.5 mm serving as a penetrating member, and the other covering member 6b is provided with a concave portion (or a through hole) having a diameter of 5 mm. Keep 6q open.
Then, this was sandwiched so as to cover the connection portion of the external lead wire and the through hole, and was bonded using the silicone adhesive 7. The protrusions 6p and the recesses 6q of the two covering members were fitted to each other, and the fitted portions were bonded using a silicone adhesive.
[0014]
In this case, the protrusion 6p of the covering member 6a becomes a penetrating member penetrating through the through hole 4h of the solar cell module, and is fitted with the concave portion 6q of the other covering member 6b, so that the fixing force is equal to that of the conventional protective film and the film-like covering member. It is stronger than the lamination. In particular, the resistance to displacement has increased.
Therefore, the unexpected pulling force applied to the external lead wire did not reach the main wiring, and the installation work of the solar cell module became easy.
[0015]
In addition, no slippage or the like occurs at the connection portion of the external lead wire, the penetration of moisture along the connection portion is suppressed, and the weather resistance of the solar cell module is improved.
In addition, if the thickness of the covering member is about 1 mm or more, higher mechanical strength than the protective film can be obtained. If the thickness of the solar cell module is too large, it may cause inconvenience in installation. Therefore, it is estimated that the upper limit is about 5 mm.
Example 2
FIG. 2 is an exploded perspective view showing an embodiment of coupling of the covering member according to the present invention with eyelets.
[0016]
The process from the exposure of the end of the main wiring to the connection of the external lead wire is the same as in the first embodiment, but the shape of the covering member is different.
Two 30 mm square vinyl chloride plates having a thickness of 5 mm are prepared as covering members. A through hole 6h having a diameter of 5 mm is formed in the two covering members 6c.
The through-hole 4h of the solar cell module and the through-hole 6h of the covering member 6c were aligned with each other, bonded using a silicone adhesive, and fixed with a stainless steel rivet having high corrosion resistance.
[0017]
In this case, the mechanical strength of the rivet is higher than that of the covering member made of resin, and the resistance to displacement and separation of the covering member is further strengthened as compared with the first embodiment.
In addition, since pressure bonding is performed with eyelets, there is an advantage that the pressing time during bonding can be reduced.
Example 3
FIG. 3 is an exploded perspective view showing an embodiment of bonding the covering member according to the present invention.
[0018]
The process from the exposure of the end of the main wiring to the connection of the external lead wire is the same as in the first embodiment, but the shape of the covering member is different.
On the other hand, two 30 mm square vinyl chloride plates having a thickness of 5 mm were prepared as the covering member 6 d, and were sandwiched so as to cover the connection portion of the external lead wire and the through hole 4 h, and were bonded using a silicone adhesive. . Here, it is important to fill the through holes 4h with an adhesive. The solidified adhesive becomes a penetrating member, and secures the two covering members 6a with higher mechanical strength than the securing of the protective film 4 to prevent the two covering members 6a from being displaced from each other. It is preventing. Similarly, the resistance to the separation of the two covering members 6a from each other is stronger than that in the conventional case of laminating the protective film and the reinforcing film, and the fixing strength of the external lead wire and the connecting portion is increased.
Example 4
In this embodiment, the two covering members of the above embodiment are integrated and one folded covering member is used.
[0019]
FIG. 4 is a perspective view showing an example of one folded cover member according to the present invention. The covering member 6e is a member in which the two vinyl chloride plates of the second embodiment are connected and bent at the side that comes into contact with the end of the solar cell module. A hole 6i for passing an external lead wire is formed in the center of the bent portion. The method of using the covering member 6e is clear.
[0020]
It is clear that this configuration is also applicable to the covering members of Examples 2 and 3.
By integrally molding the covering member using a mold, handling can be facilitated and the number of external lead wire connection steps can be reduced.
[0021]
【The invention's effect】
According to the present invention, the main wiring are arranged on both sides of one or more solar cells, each solar cell and the main wire is connected by従配line, will have these sealed by a protective film, protective the main wiring and the external lead wire is connected at the end of the film Rutotomoni, at least in the connecting portion and a solar cell module the peripheral portion is sealed coated sealing by covering member from both sides of the solar cell module, the covering member The mechanical strength is higher than the protective film, the mechanical strength is higher than the protective film, which is bonded to the protective film with an adhesive, and penetrates through the through holes of the protective film opened on both sides of the main wiring. Since the cover member is fixed by the penetrating member, the covering member is adhered to both sides of the solar cell module with an adhesive, and the penetrating member is covered by the adhesive. Since securing the members together directly, mechanical strength than sticking through the protective film of the conventional solar cell module is high. Therefore, the pulling force applied to the external lead wire does not reach the main wiring, and the installation work of the solar cell module becomes easy. Also, no distortion or displacement occurs at the connection portion of the external lead wire, and the weather resistance and reliability of the solar cell module are improved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of fitting of a covering member according to the present invention; FIG. 2 is an exploded perspective view showing an embodiment of joining of the covering member according to the present invention with eyelets; FIG. FIG. 4 is an exploded perspective view showing an example of bonding of a covering member according to the present invention. FIG. 4 is a perspective view showing an example of one folded covering member according to the present invention. FIG. 5 shows a solar cell module, and FIG. FIG. 6B is a plan view, and FIG. 6B is a sectional view taken along line XX in FIG. 6A. FIG. 6 is an exploded perspective view showing a conventional external lead wire connecting portion to a solar cell module and a covering member.
REFERENCE SIGNS LIST 1 solar cell 2 main wiring 3 sub wiring 4 protection film 4 h through hole 41 sealing protection film 42 weatherproof film 5 external lead wire 5 a wire 5 b heat shrinkable tube 6 coating member 6 a coating member 6 b coating member 6 c coating member 6 d coating member 6e Covering member 6s Covering member 6h Through-hole 6p Projection 6q Recess 6r Eyelet tack 7 Adhesive

Claims (8)

Main wiring is arranged on both sides of one or more solar cells, each solar cell and the main wiring are connected by a sub wiring, and these are sealed by a protective film. wiring and the external lead wire is connected Rutotomoni, at least in the connecting portion and a solar cell module the peripheral portion is sealed coated sealing by covering member from both sides of the solar cell module, the covering member, the machine than the protective film High strength, adhered to the protective film by an adhesive, and penetrate through holes of the protective film opened on both sides of the main wiring, is fixed by a penetrating member having a higher mechanical strength than the protective film. A solar cell module. The solar cell module according to claim 1, wherein the penetrating member is made of the same material as the covering member. 3. The solar cell module according to claim 2, wherein a surface of the covering member facing the solar cell module is provided with a projection and a recess or a hole that fit together. 4. The solar cell module according to claim 1, wherein the penetrating member is a rivet made of a corrosion-resistant metal. The solar cell module according to claim 1, wherein the penetrating member is made of the adhesive. The solar cell module according to claim 1, wherein the covering member is made of soft vinyl, hard vinyl chloride, acrylic resin, polycarbonate resin, polyester resin, or epoxy resin. The solar cell module according to any one of claims 1 to 6, wherein the adhesive is a silicone adhesive. The covering member is formed by bending a single plate, a hole for passing the external lead wire is formed in the bent portion, and the inside of the bent portion is opposed to an end of the solar cell module. The solar cell module according to claim 1, wherein:

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