JP3972245B2 - Solar cell module and installation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solar cell module with improved fireproof performance and a method for installing the solar cell module, and more particularly, to a structure of a power lead drawing device portion for taking out the electric power generated by the solar cell to the outside, and an installation method adapted to this structure.
[0002]
[Prior art]
As the global environmental problems are highlighted, solar cells are highly expected as clean renewable energy.
[0003]
Solar cells are broadly classified into crystalline solar cells and amorphous thin-film solar cells. Crystalline solar cell modules that use crystalline silicon as the main raw material have already begun production on a commercial scale, but the structure is such that the power generation element is covered with a filler and the light-receiving surface is covered with glass, such as aluminum. In general, the frame is attached and fixed to a frame installed on a roof or the like. This type of solar cell module has a weight due to the use of glass, a problem of stable supply of crystalline silicon, which is a raw material of the solar cell, and the like.
[0004]
On the other hand, in the case of a thin-film solar cell module mainly using amorphous silicon, when a heat-resistant plastic film or the like is used as a substrate for a power generation element, the power generation element portion is flexible, so that it is applied to a gently curved surface. Is possible and the range of use is expanded. For example, when making a steel plate integrated solar cell module that takes advantage of this feature, a weather-resistant resin film is applied instead of a glass plate as a surface protective material on the light receiving surface side, and the surrounding portion where no power generating element is arranged If it is bent, it will be possible to supply lightweight solar cell roofs with workability equivalent to that of ordinary steel roofing materials, and it will be applicable to these markets where it has been difficult to apply so far. It is thought that it becomes. In addition, since the amount of silicon used as a raw material is small, there is no problem in supply.
[0005]
By the way, when a solar cell module is mounted on the roof of a house, it is one of the requirements necessary to be approved as a building to meet legal regulations for fire prevention. For example, in the case of a wooden building, in order to prevent the spread of fire due to flying fire, the roof is to be fired with a non-combustible material. For this reason, when a solar cell having a conventional structure is mounted, a metal plate such as a steel plate as described above is used as the back surface protection member in order to increase the fire resistance of the solar cell as a roofing material. As a fire resistant material, a nonflammable glass plate is preferably used. Moreover, although fire resistance is inferior to a glass plate, a flame-retardant resin film such as ETFE (ethylene-tetrafluoroethylene copolymer) is used as a surface protection member from the viewpoint of improving workability and reducing weight. It is done.
[0006]
As described above, a conventional example of a building material integrated solar cell module using a steel plate as a back surface protection member will be described below (see Patent Documents 1 and 2).
[0007]
FIG. 6 shows a diagram of a solar cell module described in Patent Document 1. In FIG. 6, 101 is a photovoltaic device, 102 is a terminal box, 103 is a power extraction cable, 104 is a conductive member, 105 is a back surface coating material (steel plate), 106 is a hole for taking out a terminal, 107 is a surface coating material ( For example, ETFE), 108 is a filler (eg, EVA). In this example, a terminal extraction hole 106 is provided in a portion of the back surface covering material 105 where there is no photovoltaic element, and the terminal is extracted through a conductive member 104 electrically connected to the photovoltaic element 101. .
[0008]
In general, when testing the fire resistance performance of a solar cell module, a test is performed in which wood is burned at the module light-receiving surface portion assuming a spark from the light-receiving surface side. ETFE of the surface covering material is a flame retardant material, but due to flying fire, there is a hole with the passage of time and the EVA of the filler material spreads, but if the back surface covering material is steel, it can spread to the roof base plate , Quite suppressed. However, there is a case where the fire spreads through the terminal extraction hole. In the case of the above-mentioned Patent Document 1, the entire surface of the terminal extraction hole is covered with the conductive member 104 provided on the light receiving surface side of the back surface covering material, so that the roof is covered. The spread of fire is suppressed as much as possible.
[0009]
However, even with the above configuration, there is a risk of fire spreading through the terminal extraction hole due to heat deformation of the module after a spark, and in order to solve this problem, the solar cell disclosed in Patent Document 2 and shown in FIG. In the module, a closing means 308 made of a non-combustible material, a semi-incombustible material or a flame-retardant material is provided in a hole for taking out a terminal provided in a galvanized steel sheet 301 as a back material, and this closing means is connected to the solar cell element. The fireproof performance is improved by inserting the lead wire and drawing the lead wire into the terminal box. The other members (302 to 307 and 309) and the module configuration in FIG. 7 are the same as those in FIG.
[0010]
As in the above Patent Document 2, regarding the configuration in which the lead wire connected to the solar cell element is drawn out to the terminal box through a member made of a semi-incombustible material or a flame retardant material, Patent Document 3 also describes It is disclosed. What is described in Patent Document 3 is that a plurality of photoelectric conversion elements arranged in a planar shape and a light transmitting plate arranged on the light receiving surface side of the photoelectric conversion elements are cited in the claims of the same document. And a back cover member disposed on the back side of the photoelectric conversion element, a filler filled between the translucent plate and the back cover member, and a lead wire for taking out the photoelectric output to the outside In the module, the back cover member is formed with an opening through which a lead wire passes, and a mat member for covering the opening is disposed inside the back cover member. In addition, “the back cover member and the mat member are made of a material including the same metal foil, and lead wire openings provided in the back cover member and slit-like leads provided in the mat member. Is that wherein "to be a structure in which shifting the position of the opening for a line through.
[0011]
Further, similarly to Patent Document 3, a solar cell module having a structure in which openings for penetrating lead wires are provided in two stages and the positions thereof are shifted is disclosed in Patent Document 4 by the same applicant as the present application. .
[0012]
FIG. 8 shows the configuration of the module disclosed in Patent Document 4. This module is formed by sealing a solar cell 112 with an adhesive resin 113 between a glass surface protection member 111, a steel plate back surface protection member 121, and a side metal frame 110. In the solar cell module in which the internal lead wires of the positive electrode and the negative electrode are electrically connected to the external lead wires through the connection terminals, an intermediate protection member 114 is provided between the surface protection member 111 and the back surface protection member 121, The solar cell 112 is formed by sealing an adhesive resin between the surface protection member, the intermediate protection member, and the metal frame, and the internal lead wire 117 drawn through the intermediate protection member 114 is protected intermediately. The external lead wire 118 is electrically connected through a connection terminal in a terminal box 119 provided between the member and the back surface protection member, and the external lead wire passes through the back surface protection member 121 from the terminal box. It is set to constitute pulled out to the outside. "
[0013]
[Patent Document 1]
JP 2000-244001 (4th page, FIG. 1)
[Patent Document 2]
JP 2000-244000 A (page 3-8, FIG. 1)
[Patent Document 3]
JP 2001-102616 A (page 4-5, FIGS. 1, 3)
[Patent Document 4]
Japanese Patent Laid-Open No. 2002-111032 (page 4, FIG. 1)
[0014]
[Problems to be solved by the invention]
By the way, the solar cell modules disclosed in Patent Documents 2 to 4 have fireproof performance, in particular, from the light receiving surface side of the module, compared to that described in Patent Document 1, the lead wire penetration portion of the back surface protection member. Although the fireproof performance that prevents the fire from spreading to the roof is improved, there are the following problems.
[0015]
First, in the case of Patent Document 2, it is necessary to attach the closing means so that the closing means (308 in FIG. 7) does not fall off in the event of a fire. For this reason, the closing means is provided with a collar-like drop-off prevention part, Moreover, since the lead wire is pulled out from the back surface side of the effective power generation region where the solar cell is formed, it is not easy to assemble the module related to the lead wire pull-out. In addition, as in Patent Documents 3 and 4, in the case where the opening for penetrating the lead wire is provided in two stages, the position of the module related to the lead wire drawing is different depending on the degree and quality of work. Assembling is not as easy as it is.
[0016]
Therefore, it cannot be said that the solar cell modules disclosed in Patent Documents 2 to 4 are excellent in mass productivity. From the viewpoint of mass productivity, it is rather desirable to have a configuration in which the lead wire is drawn out of the range of the effective power generation area where the solar cell is formed, as in Patent Document 1, but in this case, in terms of space factor and appearance, It is not preferable.
[0017]
The present invention has been made in view of the above points, and the object of the present invention is excellent in fire resistance, and the lead-out portion of the lead wire is ineffective without significantly protruding from the side surface of the back surface protection member. An object of the present invention is to provide a solar cell module having a configuration capable of reducing the power generation region and having excellent assemblability.
[0018]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, a solar cell in which a plurality of solar cell elements are connected in series or in parallel between a fire-resistant surface protective member and a fire-resistant back surface protective member is made of an adhesive resin. A terminal box in which the positive and negative electrode lead wires of the solar cell are arranged on the non-light-receiving surface side of the back surface protection member, and the periphery of the lead wire via the side surface portion of the back surface protection member. Is a solar cell module that is electrically insulated and introduced and electrically connected to an external connection cable via the terminal box,
The back surface protection is performed along the surface of the electrically insulating member of the side surface portion of the back surface protecting member obtained by locally covering the lead wires drawn from the positive electrode and negative electrode portions of the solar cell with the electrically insulating member. From the light-receiving surface side of the member, introduced into the terminal box disposed on the non-light-receiving surface side, and the periphery of the lead wire from the electrode portion of the solar cell to the terminal box is enclosed and sealed with the adhesive resin, and, the outer surface of the adhesive resin, Ri Na coated by the refractory surface protective member, further, at least a portion of the non-power generation region of the peripheral portion of the solar cell module, and the surface protective member bonded A bent portion obtained by integrally bending the conductive resin and the back surface protection member to the non-light-receiving surface side, and a lead wire extending from the positive electrode and negative electrode portions of the solar cell to the terminal box is formed in a part of the bent portion. Notches that become part of the wiring path The provided parts, also in the cutout portion, the outer surface of the adhesive resin sealed surrounds the periphery of the lead wire, and shall such coated by the surface protective member (the invention of claim 1 ).
[0019]
According to the first aspect of the present invention, the lead wire is drawn out from the side surface portion of the back surface protection member, and there is no lead wire drawing hole in the back surface protection member as in the conventional solar cell module. Therefore, even if a spark occurs and the adhesive resin burns, the outer surface of the adhesive resin is almost covered with a fire-resistant surface protection member, so that the combustion air is blocked. In addition, the effect of suppressing fire spread becomes large.
[0020]
Moreover, according to this structure, the lead-wire operation | work from the electrode part of the positive electrode of a solar cell and a negative electrode to a terminal box becomes easy, and the safety | security with respect to high fire prevention and electrical insulation is securable. Although there is a portion where the adhesive resin is partially exposed, such as the tip of the bent portion, according to the solar cell module installation method of the invention of claim 6 described later, the exposed portion is a portion of the solar cell module. Since it is covered with a fixing member, there is very little risk of sparks and fire spread. Moreover, fire resistance can also be improved by applying and protecting a heat resistant resin (KE200 manufactured by Shin-Etsu Chemical Co., Ltd.) on the exposed portion.
[0021]
As an embodiment of claim 1, the inventions of claims 2 to 4 below are preferable.
[0022]
That is , from the viewpoint of improving fire resistance and reducing manufacturing costs, in the solar cell module according to claim 1, the back surface protection member is a steel plate (invention of claim 2 ).
[0023]
Furthermore, from the viewpoint of improvement in workability and weight reduction, in the solar cell module according to claim 1 or 2 , the surface protection member is a flame-retardant resin sheet such as ETFE (invention of claim 3 ).
[0024]
Furthermore, from the viewpoint of improving workability, in the solar cell module according to any one of claims 1 to 3 , the lead wire is a solder-coated copper foil (invention of claim 4 ).
[0025]
Moreover, as a method for installing the solar cell module, the invention of the following claim 5 is preferable from the viewpoint of improving the fire resistance and workability. That is, in the solar cell module installation method according to any one of claims 1 to 4 , a fixing member that is fixed to an installation member such as a roof and is attached to the solar cell module, and an upper surface portion of the fixing member After mounting the solar cell module, a pressing tool for pressing and fixing the solar cell module to the fixing member from above is provided, and the fixing member is a mounting rail whose cross-sectional shape is a horizontal C shape, There are curled portions that are bent inward and upward at both end portions, and two claw portions that engage with the curved portion of the bent portion of the solar cell module at the center portion. The bent portions of the adjacent solar cell modules are mounted between the curled portions, and the presser is a cover rail having a substantially T-shaped cross section, and the vertical portion of the T-shape is A projection that fits the two claw portions is formed, and after mounting the adjacent solar cell module, the projection of the presser is fitted to the claw portion, thereby While fixing, a part of the upper surface of the bent portion of the solar cell module is covered with a T-shaped horizontal portion of the presser.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0027]
FIG. 1 and FIG. 2 show schematic configuration diagrams of embodiments of the solar cell module of the present invention, and members common to the respective drawings are denoted by the same reference numerals.
[0028]
FIG. 1 is a schematic perspective view of a solar cell module. In FIG. 1, 1 is a solar cell, 2 is a back surface protection member, 3 is a bent portion of the back surface protection member, 4 is a notch portion of the back surface protection member, 5 is a lead wire, 6 is a terminal box, 7 is a connection cable, 8 Represents a connector, and as the back surface protection member 2, in this example, a galbarium steel sheet (Reino Color GL manufactured by Kawatetsu Steel Co., Ltd.) having a thickness of 0.35 mm and containing 55% aluminum was used.
[0029]
FIG. 2 shows an enlarged side cross-sectional view of part A in FIG. In FIG. 2, a solder coated copper foil having a width of 3 mm and a thickness of 100 μm is attached to the end portion of the solar cell 1 with a conductive adhesive tape except for a portion to be soldered to form a power extraction terminal 11, and a thickness of 100 μm. The solder coated copper foil leads 5 are connected by solder 12. The lead wire 5 is drawn out to the non-light-receiving surface side of the back surface protection member via the side surface of the back surface protection member 2 at the cutout portion of the back surface protection member 2.
[0030]
At this time, an electrical insulating member 9 is provided in the vicinity of the side surface of the back surface protection member through which the lead wire 5 passes in order to prevent contact with the back surface protection member. As the electrical insulating member 9, a PET (polyethylene terephthalate) film having a thickness of about 50 μm was used. However, even with other materials, sufficient heat resistance and chemical stability can be obtained in the module manufacturing process or operating conditions. Any material having electrical properties and electrical insulation may be used. Further, the lead wire 5 drawn out to the non-light-receiving surface of the back surface protection member is introduced into the terminal box 6 disposed on the non-light-receiving surface and wired so as to be output to the outside.
[0031]
On the light-receiving surface side of the module, a weather-resistant film such as a 25 μm thick ETFE (ethylene-tetrafluoroethylene copolymer, manufactured by Asahi Glass Co., Ltd.) film having a corona-treated surface was provided as the surface protection member 13. As the adhesive resin 10, EVA having a thickness of 600 μm (EVA EVASAFE manufactured by Bridgestone) was used.
[0032]
Next, the manufacturing method of the solar cell module of this invention is demonstrated using FIG. The surface protection member 13 (ETFE) and the adhesive resin 10 (EVA) are overlaid, and the solar cell 1 is placed thereon. A power extraction terminal 11 is attached to the solar cell 1 and connected to the lead wire 5 with solder 12. On top of this, the adhesive resin 10 (EVA) and the steel plate 2 as a notch-processed back surface protection member are arranged to complete the lamination. An electrically insulating member 9 is preliminarily laid in the notch portion of the steel plate.
[0033]
After laminating these materials, they were heated and cured at 150 ° C. for 60 minutes with a vacuum laminator. Thereafter, the periphery of the module was trimmed, and a cut was made with a cutter so that the lead wire 5 could be pulled out to the non-light-receiving surface side of the back surface protection member along the notch at the center of the side surface of the steel plate. After this, bending around the integrated solar cell module, introducing the lead wire drawn from the notch to the non-light-receiving surface side into the terminal box installed on the non-light-receiving surface of the back surface protection member, Electrically connected to an external connection cable.
[0034]
Next, FIG. 4 and FIG. 5 will be described. 4 and 5 show an embodiment of the solar cell module installation method according to the invention of claim 6, FIG. 4 shows a perspective view of the installation situation of two adjacent solar cell modules from above, FIG. 5 is an enlarged cross-sectional view of a portion B in FIG. 4 and shows a fixing structure of the solar cell module used in this embodiment.
[0035]
4 and 5, 100 is a solar cell module, 101 is a presser, 102 is a fixing member, 102 a is a curling portion of the fixing member, 103 is a nail for fixing the fixing member to the base plate 104, and 105 is a nail of the fixing member Reference numeral 106 denotes a protrusion of the fixing member.
[0036]
In this embodiment, a claw portion 105 is attached to the fixing member 102 of the solar cell module fixed to the base plate 104 with the nail 103 so that the presser 101 can be fixed, and after the solar cell module 100 is arranged. By fitting the presser 101, the projection 106 and the claw portion 105 are fitted, and the installation work on the roof is completed. The lead wire 5 (not shown) is covered with the presser 101 and the bent portion of the solar cell module so as not to be seen from the light receiving surface side, and the fire is spread by the presser 101 and the fixing member 102. It has an installation structure that can prevent this.
[0037]
【The invention's effect】
According to the present invention, as described above, a solar cell in which a plurality of solar cell elements are connected in series or in parallel is sealed between the fire-resistant surface protective member and the fire-resistant back surface protective member with the adhesive resin. The lead wires for the positive and negative electrodes of the solar cell are electrically connected to the terminal box disposed on the non-light-receiving surface side of the back surface protection member via the side surface portion of the back surface protection member. Insulating and introducing a solar cell module that is electrically connected to an external connection cable via the terminal box,
The back surface protection is performed along the surface of the electrically insulating member of the side surface portion of the back surface protecting member obtained by locally covering the lead wires drawn from the positive electrode and negative electrode portions of the solar cell with the electrically insulating member. From the light-receiving surface side of the member, introduced into the terminal box disposed on the non-light-receiving surface side, and the periphery of the lead wire from the electrode portion of the solar cell to the terminal box is enclosed and sealed with the adhesive resin, and, the outer surface of the adhesive resin, Ri Na coated by the refractory surface protective member, further, at least a portion of the non-power generation region of the peripheral portion of the solar cell module, and the surface protective member bonded A bent portion obtained by integrally bending the conductive resin and the back surface protection member to the non-light-receiving surface side, and a lead wire extending from the positive electrode and negative electrode portions of the solar cell to the terminal box is formed in a part of the bent portion. Notches that become part of the wiring path The section provided in this cutout portion, the outer surface of the adhesive resin sealed surrounds the periphery of the lead wire, by a shall such coated by the surface protective member,
Unlike the conventional case, it is not necessary to make a hole for drawing out the lead wire in the back surface protection member, and even if the surface of the solar cell becomes a fire due to a fire, it can be prevented from spreading to the inside of the roof. In other words, the solar cell module is excellent in fire resistance, and has a structure capable of reducing the reactive power generation region without the lead wire lead-out portion protruding from the side surface of the back surface protection member to the outside and having excellent assemblability. Can be provided.
[Brief description of the drawings]
1 is a perspective view of a solar cell module according to an embodiment of the present invention as viewed from above FIG. 2 is an enlarged side cross-sectional view of part A in FIG. 1; FIG. 3 illustrates a method for manufacturing the solar cell module of FIG. Fig. 4 is a diagram showing an embodiment of a solar cell module installation method according to the invention of claim 6. Fig. 5 is an enlarged side sectional view of part B in Fig. 4. Fig. 6 is a solar having a conventional fire prevention structure. 7 is a schematic configuration diagram of an example of a battery module. FIG. 7 is a schematic configuration diagram of a conventional solar cell module having a different fire prevention structure. FIG. 8 is a schematic configuration diagram of a conventional solar cell module having a different fire prevention structure. Explanation of]
DESCRIPTION OF SYMBOLS 1: Solar cell, 2: Back surface protection member, 3: Bending part, 4: Notch part, 5: Lead wire, 6: Terminal box, 7: Connection cable, 8: Connection connector, 9: Electrical insulation member, 10 : Adhesive resin, 11: Power extraction terminal, 12: Solder, 13: Surface protection member, 100: Solar cell module, 101: Presser, 102: Fixing member, 102a: Curled part, 103: Nail, 104: Field plate , 105: nail part, 106: protrusion.

Claims (5)

A solar cell in which a plurality of solar cell elements are connected in series or in parallel is sealed with an adhesive resin between a fire-resistant surface protective member and a fire-resistant back surface protective member, and a positive electrode and a negative electrode of the solar cell The lead wire is introduced into the terminal box disposed on the non-light-receiving surface side of the back surface protection member by electrically insulating the periphery of the lead wire via the side surface portion of the back surface protection member, and through the terminal box. A solar cell module electrically connected to an external connection cable,
The back surface protection is performed along the surface of the electrically insulating member of the side surface portion of the back surface protecting member obtained by locally covering the lead wires drawn from the positive electrode and negative electrode portions of the solar cell with the electrically insulating member. From the light-receiving surface side of the member, introduced into the terminal box disposed on the non-light-receiving surface side, and the periphery of the lead wire from the electrode portion of the solar cell to the terminal box is enclosed and sealed with the adhesive resin, and, the outer surface of the adhesive resin, Ri Na coated by the refractory surface protective member, further, at least a portion of the non-power generation region of the peripheral portion of the solar cell module, and the surface protective member bonded A bent portion obtained by integrally bending the conductive resin and the back surface protection member to the non-light-receiving surface side, and a lead wire extending from the positive electrode and negative electrode portions of the solar cell to the terminal box is formed in a part of the bent portion. Notches that become part of the wiring path The parts provided, the solar cell module in this cut-out portion, the outer surface of the adhesive resin sealed surrounds the periphery of the lead wire, and wherein the Rukoto such coated by the surface protective member. 2. The solar cell module according to claim 1 , wherein the back surface protection member is a steel plate. 3. The solar cell module according to claim 1, wherein the surface protection member is a flame-retardant resin sheet such as ETFE. 4. In the solar cell module according to any one of claims 1 to 3, wherein the lead wire, a solar cell module, characterized in that the solder coat copper foil. In the installation method of solar cell module according to any one of claims 1 to 4, the solar cell and the fixing member for attaching the solar cell module is fixed to the mounting member such as a roof, on the upper surface of the fixing member After mounting the module, a presser for pressing and fixing the solar cell module to the fixing member from above is provided, and the fixing member is a mounting rail whose cross-sectional shape is a horizontal C shape, and both ends thereof A curl portion that is bent inward and upward at the center, and two claw portions that engage with the curved portion of the bent portion of the solar cell module at the center portion. And the bent portion of the adjacent solar cell module is mounted between the two and the presser is a cover rail having a substantially T-shaped cross section, and the T-shaped vertical portion is the 2 A protrusion that fits with the claw portion of the solar battery module is formed, and after mounting the adjacent solar cell module, the protrusion of the presser is fitted with the claw portion to fix the solar cell module. A method of installing a solar cell module, wherein a part of the upper surface of the bent portion of the solar cell module is covered with a T-shaped horizontal portion of the presser.

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