JP2008066492A - Terminal box for solar cell panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the infiltration of water into inside of a terminal box from a cable output portion in a terminal box for a solar CELL panel using cables for external connection which has a surface coating of polyolefin resin whose adhesive property with a silicon system sealer is not good. <P>SOLUTION: This terminal box for the solar cell panel is intended to prevent the infiltration of water into inside of the terminal box by filling in inside of the terminal box with silicon system sealant 5. In a portion within the terminal box on a cable 2, an adhesive tape 7 whose exterior is composed of a material having adhesiveness with a silicon system sealant is continuously adhered and wound around over all periphery of the cable, or an adhesive agent having adhesiveness with both of the silicon system sealant and the cable surface coating of polyolefin resin are coated over all periphery of the cable. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a terminal box for a solar cell panel that effectively prevents water from entering the inside of the terminal box from the extended portion of the cable for external connection and eliminates the risk of leakage.

  Since the solar cell terminal box is used in an environment exposed to outdoor wind and rain, there is a risk that rainwater may enter the terminal box and cause electric leakage. In particular, in a terminal box for a solar cell panel, an external connection cable for taking out an output current from the solar cell panel is extended from the inside of the terminal box to the outside through an opening provided in a side wall portion or the like of the terminal box. Since it is arranged so that it comes out, rainwater and the like easily enter the inside of the terminal box from this cable extension. Conventionally, this problem has been reliably prevented by filling the inside of the terminal box with a silicone sealant. This is because the silicone sealant filled in the terminal box is connected externally because the silicone sealant has excellent adhesion to the vinyl chloride resin that has been used as an insulating surface coating for external connection cables. This is because it was able to adhere closely to the surface coating of the cable for use.

  On the other hand, in recent years, there has been a tendency to avoid the use of vinyl chloride resin, which may generate dioxins during combustion, due to increased awareness of environmental problems. Instead, it is common to use polyolefin resins such as polyethylene, polypropylene, and polymethylpentene.

However, unlike vinyl chloride resin, polyolefin resin is inferior in adhesiveness with silicone-based sealant. Therefore, in the case of a terminal box using an external connection cable having a polyolefin resin surface coating, the adhesive between the sealant and the external connection cable surface coating is filled even if the silicone-based sealant is filled inside. Is not so strong, if the cable is displaced and the cable position is displaced, or if the cable changes dimensions due to changes in ambient environmental conditions (temperature and humidity), the surface coating of the cable and the sealant around it There is a risk that a gap will be formed between them, and rainwater or the like may enter the inside of the terminal box and cause electric leakage. In particular, when installing solar panels, it is common to install a terminal box on the back of the panel on the ground, then hold the cable and pull the panel (weight approximately 20 kg) to the installation location such as the roof of the house. The problem of peeling of the surface coating of the cable and the sealant around it due to the load on the cable is serious.
Japanese Patent Laid-Open No. 11-026035

  The present invention was devised in view of the current state of the prior art, and an object of the present invention is to provide a solar cell panel using an external connection cable having a polyolefin resin surface coating inferior in adhesion to a silicone-based sealant. It is to be able to reliably prevent water from entering from the cable extension portion into the terminal box in the terminal box for use.

  In order to achieve the above object, the present inventor has intensively studied a suitable method for preventing water from entering between the cable surface coating of the polyolefin resin and the silicone sealant. Adhesive tape made of a material having adhesive and adhesive is wrapped around the cable surface coating, or the cable surface coating is bonded to both the silicone sealant and the polyolefin resin cable surface coating. As a result, it was found that the intrusion of water into the terminal box from the cable extension portion can be surely prevented by coating on the cable, and the present invention has been completed.

  That is, according to the present invention, the external connection cable having a polyolefin resin surface coating is a solar cell panel terminal box arranged so as to extend from the inside of the solar cell panel terminal box to the outside. In the terminal box, which is filled with a silicone-based sealant and intended to prevent water from entering the terminal box, at least a part of the cable located in the terminal box An adhesive tape made of a material having an adhesive property with the silicone-based sealant on the outer side is continuously bonded and wound around the entire circumference of the cable, whereby the cable extension portion extends into the terminal box. Provided is a terminal box for a solar cell panel, which is characterized by preventing water from entering. According to a preferred embodiment, the outside of the adhesive tape is made of polyester resin, glass fiber, polycarbonate resin, epoxy resin, polyimide resin, fluorine resin, polyphenylene sulfide resin, silicone resin, silicone rubber, or polyetherimide resin.

  Further, according to the present invention, the external connection cable having a polyolefin resin surface coating is a solar cell panel terminal box arranged to extend from the inside of the solar cell panel terminal box, In the terminal box, which is filled with a silicone-based sealant and intended to prevent water from entering the terminal box, at least a part of the cable located in the terminal box The adhesive having adhesiveness with both the silicone-based sealing agent and the polyolefin resin cable surface coating is continuously applied over the entire circumference of the cable, whereby the inside of the terminal box is extended from the cable extension portion. A terminal box for a solar cell panel is provided, which is characterized by preventing water from penetrating into the solar cell. According to a preferred embodiment, the adhesive is an epoxy adhesive, a silicone adhesive or a cyanoacrylate adhesive.

  According to the terminal box of the present invention, the adhesive tape having adhesiveness with the silicone sealant is wound around the surface coating of the cable, or the adhesive tape has adhesiveness with both the silicone sealant and the polyolefin resin. Since the agent is applied to the cable surface coating, even if the cable surface coating is made of polyolefin resin instead of conventional vinyl chloride, water penetration from the cable extension to the inside of the terminal box and electric leakage caused thereby can be prevented. Occurrence can be reliably prevented.

  The present invention is a solar cell panel terminal box that is intended to be filled with a silicone-based sealant, and the surface coating material of the external connection cable is changed from a conventional vinyl chloride resin to a polyolefin resin. The means which can reduce reliably the increase in the possibility of the penetration | invasion of the water to the inside of a terminal box from the cable extension part which arises in this is provided.

  Since the vinyl chloride resin that has been used as a surface coating for external connection cables is excellent in compatibility with silicone sealants, filling a terminal box with a silicone sealant causes the silicone sealant to chlorinate. Adhering closely to the vinyl resin cable surface coating, it was possible to reliably prevent water from entering the terminal box from the cable extension. However, since the polyolefin resin, which has been widely used as a substitute for PVC in recent years, is inferior to the vinyl chloride resin in compatibility with the silicone sealant, the silicone sealant and polyolefin resin filled in the terminal box are not suitable. Strong adhesion does not occur with the cable surface coating. Therefore, if a load is applied to the cable and the position of the cable is displaced, or if the cable undergoes a dimensional change due to changes in the surrounding environmental conditions, the silicone sealant around the cable cannot follow the displacement or dimensional change of the cable. There is a danger that rainwater or the like may enter the inside of the terminal box from being peeled off from the cable surface coating to form a gap between the sealant and the cable surface coating.

  The present invention solves the above-described problems when using an external connection cable having a polyolefin resin surface coating that is inferior in adhesion to a silicone-based sealant in a solar cell panel terminal box, Specifically, an adhesive tape made of a material having an adhesive property to the silicone sealant on the outside is attached to the surface coating of the cable and wound (first embodiment), or a cable of silicone sealant and polyolefin resin By applying an adhesive having adhesiveness to both the surface coating to the surface coating of the cable (second embodiment), water penetration from the cable extension portion into the terminal box is surely prevented. Hereinafter, a first embodiment and a second embodiment of the present invention will be described with reference to the drawings.

First embodiment (embodiment in which adhesive tape is wound around the surface coating of a cable)
1 to 3 are conceptual schematic views of the terminal box according to the first embodiment of the present invention. FIG. 1 is a view of the terminal box from which the cover plate of the housing is removed as viewed from above. FIG. FIG. 3 is a cross-sectional view taken along a line AA ′ with the cover plate of the terminal box fitted, and FIG. 3 is an enlarged view of a portion B of the terminal box of FIG. The terminal box according to the first aspect of the present invention has the same structure as the conventional terminal box except that a specific adhesive tape is wound around the surface coating of the cable. The configuration of the terminal box other than the adhesive tape will be described. As understood from FIGS. 1 to 3, the terminal box is generally an insulating resin casing (terminal box body) 1 and an external connection cable 2 for taking out output power from the solar cell panel to the outside. The terminal plate 3 is attached to the end thereof, and the casing (terminal box body) is filled with a sealant 5 for preventing water from entering the terminal box. An opening (not shown) is provided in the side wall of the housing 1, and an external connection cable 2 in which the conductive wire is surrounded by a surface coating of polyolefin resin extends from the inside of the terminal box to the outside through this opening. Are arranged to be. A terminal plate 3 is electrically connected to the end of the external connection cable 2 located inside the terminal box. The terminal plate 3 is fixed to the housing 1 by a method (not shown) such as fitting a hole provided in the center portion thereof with a protrusion protruding from the bottom surface of the housing 1. The bottom surface of the housing 1 is provided with a bottom hole 4 for drawing out an output lead line from the solar cell panel into the terminal box, and an output lead line (not shown) drawn through the hole is a terminal. Electrically connected to the plate 3. The casing is filled with a silicone sealant 5.

  The best feature of the terminal box of the first embodiment of the present invention is that, as best understood from FIG. 3, at least a part of the external connection cable 2 located inside the terminal box has a silicone outside. The adhesive tape 7 made of a material having adhesiveness with the system sealant is bonded and wound. The operation and effect of this adhesive tape will be described by comparing FIG. 3 and FIG. 4. Conventional terminal box in which the surface coating of polyolefin resin of external connection cable 2 directly contacts silicone sealant 5 as shown in FIG. 4. In this case, the adhesion between the polyolefin resin cable surface coating and the silicone sealant is not so strong, so that the cable may be displaced due to a load applied to the cable, or the cable may expand or change due to changes in ambient environmental conditions (temperature and humidity). When contraction occurs to cause a dimensional change, the surface coating of the cable and the sealing agent adjacent to the cable can be easily separated, and a gap 8 may be formed between them. Therefore, in the conventional terminal box as shown in FIG. 4, there is a risk that moisture such as rainwater may penetrate deeply into the inside of the terminal box from the opening provided in the side wall portion of the terminal box and the gap between the cables using this gap as an entry path. When this moisture reaches the live part 9 of the cable, that is, the part where the lead wire of the cable is not covered with the insulating surface coating or the terminal plate 3 connected to the end, there is a risk of electric leakage. On the other hand, in the terminal box of the first embodiment of the present invention, as shown in FIG. 3, the outer side of the tip of the cable 2, that is, the portion of the cable 2 located inside the terminal box is bonded to the silicone sealant. Since the adhesive tape 7 made of a material having the above is bonded and wound, even if the cable is pulled, a load is applied to the cable, the position of the cable is shifted, and the cable expands or contracts due to high temperature in summer or low temperature in winter. Even if the size changes, the outer side of the adhesive tape 7 and the silicone sealant around it move closely following each other, and a gap is formed between the adhesive tape 7 and the silicone sealant. There is no. Accordingly, in the terminal box of the first embodiment of the present invention, even if moisture such as rainwater tries to enter the inside of the terminal box through the gap between the opening provided in the side wall portion of the terminal box and the cable, the moisture adheres. Since the penetration is prevented at the portion 10 around which the tape 7 is wound and cannot proceed further, there is a risk that water will reach the live part 9 of the cable or the terminal plate 3 connected to the end of the cable and cause leakage. There is no.

  The adhesive tape 7 used in the first embodiment of the present invention has a basic configuration consisting of a sheet-like substrate and an adhesive layer. As the layer arrangement of the adhesive tape, any one of the sheet-like substrate and the adhesive layer may be in contact with the silicone sealant as long as it has adhesiveness with the silicone sealant. In addition, the number of base materials and adhesive layers is not limited to one, and a plurality of base materials and adhesive layers can be provided as long as they are not separated from each other. Examples of the adhesive tape used in the first embodiment of the present invention include a single-sided adhesive tape in which an adhesive layer is provided on one side of a sheet-like substrate, and a double-sided adhesive tape in which an adhesive layer is provided on both sides of the substrate. In addition, examples include an adhesive obtained by applying a layer of an additional adhesive excellent in adhesiveness with a silicone-based sealing agent on one side of a double-sided adhesive tape. In the adhesive tape, it is necessary that the material constituting the outside that comes into contact with the silicone sealant when wound around the cable has adhesiveness with the silicone sealant. In the present invention, “adhesiveness” refers to silicone-based sealing even when a load is applied to the cable and the position of the cable is shifted or when the cable expands or contracts due to changes in temperature or humidity. It means the performance that the agent and the substrate follow closely without being separated and maintain the adhesion state. Examples of materials having adhesiveness with silicone-based sealants include polyester resins (particularly polyethylene terephthalate resins), glass fibers, polycarbonate resins, epoxy resins, polyimide resins, fluororesins, polyphenylene sulfide resins, silicone resins, silicone rubbers, and poly There may be mentioned etherimide resins. The type of adhesive on the inside of the adhesive tape can be used to adhere the tape to the polyolefin resin cable surface coating with any of the conventionally known adhesives. For example, acrylic, rubber, silicone Alternatively, a butyl rubber adhesive can be used.

  The winding of the adhesive tape around the cable is preferably performed continuously and continuously over the entire circumference. If there is a part where the adhesive tape is interrupted even at one part of the entire circumference of the cable, when a load is applied to the cable, the sealant in this part and the cable surface coating are peeled off to create a gap, from which water can flow inside the terminal box. This is because there is a risk of entering. However, it is not necessary to wrap the adhesive tape around all the portions located inside the terminal box of the cable, and the adhesive tape may be wound only at the end of the cable as shown in FIG. In short, even at one of the parts located inside the terminal box of the cable, the adhesive tape is continuously wrapped around the entire circumference of the cable without any breaks, and the area to be adhered to closely follows the silicone sealant is cabled. What is necessary is just to form on a surface coating.

Second embodiment (a mode in which the adhesive is applied to the surface coating of the cable)
In the terminal box of the second embodiment of the present invention, instead of the adhesive tape of the first embodiment, an adhesive having adhesiveness with both the silicone-based sealing agent and the polyolefin resin cable surface coating is used. It is provided between the cable surface coating and the silicone sealant. By applying such an adhesive to the surface coating of the external connection cable 2, the adhesive and the surrounding silicone sealant closely follow each other in the same manner as when the adhesive tape is wound. Even if a load is applied to the cable, there is no gap between the adhesive and the silicone sealant, and it is possible to reliably prevent water from entering the terminal box and the risk of electric leakage. it can. The adhesive used here must have adhesion to both the silicone sealant and the polyolefin resin cable surface cover to prevent water from entering from the interface between the surface cover and the sealant. Examples thereof include an epoxy adhesive, a silicone adhesive, and a cyanoacrylate adhesive. For the same reason as the winding of the adhesive tape of the first embodiment, it is necessary to apply the adhesive continuously over the entire circumference of the cable. However, at least one of the portions located inside the terminal box of the cable is required. A partial adhesive may be applied. In short, even at one of the parts located inside the terminal box of the cable, the adhesive is continuously applied over the entire circumference of the cable, and the area to be adhered to closely follow the silicone sealant is covered with the cable surface. It may be formed on the top. Since the drawing of the terminal box of the second embodiment is obtained by replacing the adhesive tape 7 with an adhesive in FIGS.

  Next, the manufacturing method of the terminal box of this invention is demonstrated. In the terminal box of the present invention, generally, (i) the terminal plate 3 is electrically connected to the end of the external connection cable 2, and (ii) the adhesive tape 7 is wound around a predetermined position of the cable 2 or the adhesive 7 (Iii) arranging the cable 2 so as to extend from the inside of the terminal box to the outside through the opening in the side wall portion of the housing 1, and (iv) fixing the terminal plate 3 to the housing 1. Manufactured by. The winding of the adhesive tape 7 around the cable 2 or the application step (ii) of the adhesive 7 is preferably performed between the step (i) and the step (iii) in terms of ease of work, but the step (ii) is performed. Of course, it can be performed prior to step (i), between step (iii) and step (iv), or after step (iv). In any case, when applying an adhesive instead of an adhesive tape in step (ii), it is preferable to perform the next step after the adhesive is completely cured. The completed terminal box is bonded to a predetermined position on the back surface of the solar cell panel at the construction site of the solar cell panel, the output lead-out line from the solar cell panel and the terminal plate 3 are electrically connected, and finally the silicone inside the terminal box. A system sealant is filled. After the filled silicone sealant is completely cured, the solar cell panel to which the terminal box is attached is installed at a construction site such as a roof of a house.

  While the preferred embodiment of the terminal box of the present invention has been described above, the terminal box of the present invention is not limited to that described above, and any modification, addition, Obviously, changes may be made.

  Hereinafter, examples are shown to show the leakage prevention effect of the terminal box of the present invention, but the present invention is not limited to these examples.

1. Preparation of terminal box sample
Comparative example 1 (conventional example)
A brass terminal board 2.5 cm long × 1 cm wide × 0.1 cm thick is electrically connected to the end of an external connection cable with a cross-sectional area of 2.5 mm ² covered with a polyethylene resin surface coating by caulking. The cable is arranged so as to extend from the inside of the terminal box to the outside through an opening provided in a side wall portion of a terminal box (housing) made of insulating resin having a length of 5 cm, a width of 8 cm, and a thickness of 2 cm. . The length of the portion of the cable located inside the terminal box was 1.5 cm. Next, a hole drilled in the center of the terminal plate is fitted into the protrusion protruding from the bottom of the terminal box, and the terminal plate is fixed to the bottom surface of the terminal box by fitting a chrysanthemum from above, such as shown in FIG. Created a box. Thereafter, the inside of the terminal box was filled with a silicone sealant and left for 30 minutes to be completely cured. When filling the sealant, the bottom opening of the terminal box was previously blocked so that the filled sealant would not flow. In addition, when filling the sealant, after attaching the electrode to the live part where the copper wire at the end of the cable is exposed and pulling it out to the outside of the terminal box, and after filling the sealant inside the terminal box A voltage could be applied to the live part. In this way, a total of four identical samples (Comparative Example 1A, Comparative Example 1B, Comparative Example 1C, and Comparative Example 1D) were prepared.
Invention Example 1
After the terminal plate is electrically connected to the end of the cable, an acrylic adhesive layer (Invention Example 1A), a rubber adhesive layer (Invention Example 1B), and a silicone adhesive on one side of the polyethylene terephthalate sheet substrate A polyethylene terephthalate adhesive tape having a width of 1.2 cm provided with a layer (Invention Example 1C) or a butyl rubber adhesive layer (Invention Example 1D) is placed over the entire circumference at the end of the cable so that the adhesive layer is on the inside. A terminal box was prepared in the same manner as in Comparative Example 1 except that the cable was placed in the terminal box after being continuously wound 1.2 times, and filled with a sealant and cured.
Invention Example 2
After the terminal plate is electrically connected to the end of the cable, an acrylic adhesive layer (Invention Example 2A), a rubber adhesive layer (invention) on one side of a base material of a woven fabric (glass cloth) made of glass fiber. Example 2B) A glass cloth adhesive tape having a width of 1.2 cm provided with a silicone adhesive layer (Invention Example 2C) or a butyl rubber adhesive layer (Invention Example 2D) so that the adhesive layer is on the inside. A terminal box was prepared in the same manner as in Comparative Example 1 except that the cable was placed in the terminal box after being continuously wound 1.2 times around the entire circumference of the cable at the end of the cable and filled with a sealing agent. And cured.
Invention Example 3
After the terminal plate is electrically connected to the end of the cable, a 1.2 cm wide adhesive tape having an acrylic adhesive layer provided on both sides of a polyester sheet base material is continuously applied to the end of the cable over the entire circumference. 1.2 Wrapping, creating a terminal box in the same manner as in Comparative Example 1 except that the cable was placed in the terminal box after the epoxy adhesive was applied and cured in layers on the surface, The sealant was filled and cured (Example 3A, Example 3B, Example 3C, Example 3D).
Invention Example 4
After the terminal plate is electrically connected to the end of the cable, a 1.2 cm wide adhesive tape having an acrylic adhesive layer provided on both sides of a polyester sheet base material is continuously applied to the end of the cable over the entire circumference. 1.2 Wrapping, creating a terminal box in the same manner as in Comparative Example 1 except that the cable was placed in the terminal box after the silicone adhesive was applied in layers on the surface and cured. The sealant was filled and cured (Example 4A, Example 4B, Example 4C, Example 4D).
Reference example 1
After electrically connecting the terminal board to the end of the cable, an acrylic adhesive layer (Reference Example 1A), a rubber adhesive layer (Reference Example 1B), or a silicone adhesive on one side of the nickel / copper sheet substrate A nickel / copper shield adhesive tape with a width of 1.2 cm provided with a layer (Reference Example 1C) or a butyl rubber adhesive layer (Reference Example 1D) over the entire circumference at the end of the cable so that the adhesive layer is inside. A terminal box was prepared in the same manner as in Comparative Example 1 except that the cable was placed in the terminal box after being continuously wound 1.2 times, and filled with a sealant and cured.
Reference example 2
After electrically connecting the terminal board to the end of the cable, an acrylic adhesive layer (Reference Example 2A), a rubber adhesive layer (Reference Example 2B), a silicone adhesive layer ( Reference Example 2C), or an EPDM rubber adhesive tape having a width of 1.2 cm provided with a butyl rubber adhesive layer (Reference Example 2D) is continuously 1 over the entire circumference of the cable so that the adhesive layer is on the inside. A terminal box was prepared in the same manner as in Comparative Example 1 except that the cable was placed in the terminal box after being wound twice, and filled with a sealant and cured.
Invention Example 5
After the terminal plate is electrically connected to the end of the cable, an epoxy adhesive is continuously applied to the end of the cable with a width of 1.2 cm and an adhesion amount of 50 g / m ² and left for 30 minutes. A terminal box was prepared in the same manner as in Comparative Example 1 except that the cable was placed in the terminal box after the epoxy adhesive was completely cured, and then filled with a sealant and cured (this Invention Example 5A, Invention Example 5B, Invention Example 5C and Invention Example 5D).
Invention Example 6
After the terminal plate is electrically connected to the end of the cable, a silicone adhesive is continuously applied to the end of the cable with a width of 1.2 cm and an adhesion amount of 50 g / m ² , and left for 30 minutes. A terminal box was prepared in the same manner as in Comparative Example 1 except that the cable was placed in the terminal box after the silicone adhesive was completely cured, and then filled with a sealant and cured (this Invention Example 6A, Invention Example 6B, Invention Example 6C, and Invention Example 6D).
Invention Example 7
After the terminal plate is electrically connected to the end of the cable, a cyanoacrylate adhesive is continuously applied to the end of the cable with a width of 1.2 cm and an adhesion amount of 50 g / m ² and left for 30 minutes. Then, except that the cable was placed in the terminal box after the cyanoacrylate adhesive was completely cured, a terminal box was created in the same manner as in Comparative Example 1, filled with a sealant, and cured. (Invention Example 7A, Invention Example 7B, Invention Example 7C and Invention Example 7D).

2. Measurement of leakage prevention effect Each terminal box sample prepared as described above was sequentially subjected to the following four types of durability tests.
(I) Temperature test: The terminal box sample was kept at −40 ° C. for 10 minutes and then kept at 85 ° C. for 10 minutes for 50 cycles.
(Ii) Temperature / humidity test: The terminal box sample was kept at -40 ° C for 10 minutes, and then kept at 85 ° C and 85% relative humidity for 1 hour for 10 cycles.
(Iii) Tensile test: A load of 4.5 kgf was applied to the left and right cables of the terminal box sample for 10 seconds in the direction A (cable drawing direction) in FIG.
(Iv) Bending test: bending the left and right cables of the terminal box sample by applying a load of 2.5 kgf once in the directions B _{1 to} B ₃ (left, right, and vertical directions) in FIG. The cycle was repeated.
Next, after each terminal box sample was immersed in water for 30 minutes, a voltage of 1000 V was applied between the electrode previously attached to the live part at the end of the cable in the immersed state and the electrode installed in water. It was applied for a minute and the insulation resistance between the live part and water was measured. The insulation resistance was measured separately for each terminal box sample, divided between the live part of the left cable and water (left) and between the live part of the right cable and water (right). When the measured insulation resistance was 400 MΩ or less, it was judged that there was no leakage (O), and when it was higher than 400 MΩ, it was judged that there was a leakage (×).
The results are shown in Table 1 below.

As is clear from Table 1 above, Comparative Example 1 in which neither the adhesive tape nor the adhesive was applied to the cable was leaking in all the left and right cables of the four samples, whereas a polyethylene terephthalate tape was wound. Example 1 of the present invention, Example 2 of the present invention in which a glass cloth tape is wound, Example 3 of the present invention in which a double-sided tape provided with an epoxy adhesive-cured film is wound, Book in which a double-sided tape provided with a silicone-based adhesive cured film is wound Invention Example 4, Invention Example 5 coated with an epoxy adhesive, Invention Example 6 coated with a silicone adhesive, and Invention Example 7 coated with a cyanoacrylate adhesive are all cables of four samples. There was no leakage. Further, in Reference Example 1 in which the nickel / copper shield tape was wound, leakage was caused by two sample cables, and in Reference Example 2 in which EPDM rubber tape was wound, leakage was caused by one sample cable. In addition, it was thought that the leakage current was observed in Reference Example 1 because the nickel / copper shield tape was excellent in adhesiveness with the silicone sealant, but through the current because of the contained metal. Moreover, it is thought that the electrical leakage was observed in Reference Example 2 because the EPDM rubber tape was inferior in adhesiveness with the silicone sealant.
From the above results, the terminal box of the present invention in which a specific adhesive tape or adhesive is applied to the cable is a terminal from the extended portion of the cable for external connection even when the cable is loaded or under severe temperature and humidity conditions. It is clear that water can be reliably prevented from entering the box.

  Since the terminal box of the present invention can effectively prevent water from entering the inside of the terminal box from the extended portion of the cable, the solar cell panel is required to have extremely high safety and reliability in long-term use. It can be suitably used in the field of terminal boxes.

It is the figure which looked at the terminal box which removed the cover plate of the housing | casing from the upper side. It is sectional drawing along line AA 'in the state which fitted the cover plate of the terminal box of FIG. It is an enlarged view of the part B of the terminal box of FIG. It is the elements on larger scale of the conventional terminal box which does not use an adhesive tape. It is a figure which shows the terminal box created in the Example.

Claims (4)

  A terminal box for a solar cell panel in which an external connection cable having a polyolefin resin surface coating extends from the inside of the terminal box for a solar cell panel to the outside, and the inside of the terminal box is sealed with a silicone system What is intended to prevent water from entering the inside of the terminal box by being filled with an agent, and at least part of the portion of the cable located inside the terminal box, the outside is the silicone-based sealing An adhesive tape made of a material having adhesive properties and adhesive is continuously adhered and wound around the entire circumference of the cable, thereby preventing water from entering from the cable extension into the terminal box. Characteristic terminal box for solar panel.   The outside of the adhesive tape is made of polyester resin, glass fiber, polycarbonate resin, epoxy resin, polyimide resin, fluorine resin, polyphenylene sulfide resin, silicone resin, silicone rubber, or polyetherimide resin. Terminal box for solar panels.   A terminal box for a solar cell panel in which an external connection cable having a polyolefin resin surface coating extends from the inside of the terminal box for a solar cell panel to the outside, and the inside of the terminal box is sealed with a silicone system What is intended to prevent water from entering the inside of the terminal box by being filled with an agent, and at least a part of the portion of the cable located inside the terminal box includes the silicone-based sealing agent and An adhesive having adhesiveness with both of the polyolefin resin cable surface coating is continuously applied over the entire circumference of the cable, thereby preventing water from entering from the cable extension into the terminal box. The terminal box for solar cell panels characterized by the above-mentioned.   The solar cell panel terminal box according to claim 3, wherein the adhesive is an epoxy adhesive, a silicone adhesive, or a cyanoacrylate adhesive.

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