JPH0955520A - Terminal leading-out part structure of solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal leading-out part structure of a solar battery module which is excellent in bonding workability, reliability and external appearance. SOLUTION: A hollow structure body 404 for insulaing and protecting the electrode leading-out part of a solar battery module 406 has a protruding part 404 in the outer peripheral part of a surface facing the solar battery module. The hollow structure body 404 is bonded to the solar battery module 406 by using adhesive agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for taking out a terminal of a solar cell module, and more particularly to a technique for improving a bonding workability and reliability in a terminal box attached to a solar cell module and improving its appearance.

[0002]

2. Description of the Related Art In recent years, an increasing awareness of environmental problems has been spreading worldwide, and in particular, there is a great concern about the global warming phenomenon caused by CO ₂ emission, and there is a desire for clean energy. It is getting stronger and stronger.

Due to its safety and ease of handling, it can be said that solar cells are currently promising as a clean energy source. There are various types of solar cells. Typical examples include a crystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, a copper indium selenade solar cell, and a compound semiconductor solar cell. Among them, thin-film crystalline silicon solar cells, compound semiconductor solar cells, and amorphous silicon solar cells can be made relatively large in area at relatively low cost, and have been actively researched and developed in various fields in recent years.

Here, the solar cell element is usually EVA.
It is embedded in a filler such as (ethylene-vinyl acetate copolymer), sandwiched between a surface covering material and a back surface reinforcing material, and used as a module for a solar cell module. As the surface coating material, glass or a weather resistant film such as a fluororesin film is used. Further, as the back surface reinforcing material, weather resistance and moisture resistant film in which aluminum foil is sandwiched with weather resistant film, thin steel plate such as unpainted galvanized steel plate, polyester resin or acrylic resin from the viewpoint of flexibility and hardness. The coded steel plate and plastic plate are used.

Further, the output terminal of the solar cell module includes a screwing method, a lead wire method, a socket method and the like, and in any case, a terminal box having a waterproof structure is often provided for insulation. Further, such a terminal box is often attached to the back surface side of the solar cell module with an adhesive such as a silicone resin.

[0006]

By the way, in the case where the terminal box is attached to the back surface side of the solar cell module by the adhesive as described above, the adhesive spreads sufficiently on the adhesive surface due to the variation in the force pressing the terminal box. There was a problem that the thickness of the adhesive was reduced and the adhesive strength was reduced because the pressing force was too strong.

Further, in a state where the terminal box is adhered to the solar cell module as it is, since the adhesive agent protrudes from the outer peripheral edge of the terminal box, the appearance becomes unsightly. In this case, if the adhesive remains protruding, the protruding adhesive is exposed to the direct light or scattered light of sunlight, resulting in significant deterioration in performance. Alternatively, when the adhesive that has overflowed is wiped off, the workability is poor and the adhesive between the terminal box and the solar cell module may be wiped off.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a terminal lead-out structure for a solar cell module, which has good adhesive workability, high reliability, and a beautiful appearance.

[0009]

The terminal lead-out portion structure of the solar cell module according to the present invention is characterized by having a hollow structure having a convex shape at the outer peripheral edge portion of the surface facing the solar cell module.

The hollow structure is, for example, a terminal box. And the structure of this invention is used suitably for the adhesion surface with the solar cell module of the terminal box attached to a solar cell module. That is, the present invention
By applying this to the terminal box and adhering it to the solar cell module, the adhering workability of the terminal box is improved and the adhering reliability is improved.

Here, the hollow structure may be composed of a base portion and an upper lid portion, and a convex shape may be formed on the base portion.
The convex shape and the solar cell module are attached to each other with, for example, a double-sided tape. Furthermore, the above-mentioned base is bonded to the solar cell module by filling the inside of the hollow structure with a filling sealant having a viscosity of 1000 poise or less. Usually, at least one through hole arranged on the electrode lead-out portion of the solar cell module is formed on the facing surfaces of the hollow structure.

In the above structure, the hollow structure is
Plastic is preferable in terms of electric insulation, strength, water resistance, ease of handling, weight and the like. Moreover, as the adhesive, a silicone sealant, an epoxy resin adhesive, or the like is preferable.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration diagram of a solar cell module using the present invention. FIG. 1 is a sectional view of the solar cell module. This solar cell module has a back surface reinforcement 1
01, a solar cell element 102, a filler 103, a weather resistant film 104, and a terminal box 105.

The large intestine battery module of the present invention can be manufactured, for example, as follows. The sheet-like filler 103 such as EVA, the solar cell element 102, the filler 103, and the weather resistant film 104 are sequentially stacked on the back surface reinforcing member 101, and the above EVA is performed at 150 ° C. while defoaming under pressure.
The solar cell element 102 was sandwiched between the weather resistant film 104 and the back reinforcing material 101 by melting. After that, the terminal wiring is taken out from the back surface of the solar cell module and the terminal box is attached.

Next, the hollow structure, the filler and the adhesive used in the present invention will be described in more detail.

(Hollow structure) The terminal box used in the present invention is required to have excellent heat resistance, water resistance, electrical insulation and aging resistance. Further, a material having good adhesiveness with the filler is preferable. Taking these factors into consideration, plastic is preferable for the terminal box, and nonflammable plastic, ceramics and the like are preferable in view of nonflammability.

Examples of plastics include polycarbonate, polyamide, polyacetal, modified PPO,
Polyester, polyarylate, unsaturated polyester,
Strength of phenolic resin, epoxy resin, etc., impact resistance,
Examples include engineering plastics that have excellent heat resistance, hardness, and aging resistance. In addition, ABS resin, PP, P
Thermoplastics such as VC can also be used.

In order to improve the resistance to ultraviolet rays, it is preferable to use carbon black as a pigment or to apply a resin coating which absorbs ultraviolet rays on the surface.

(Filler and Adhesive) In the present invention, the filler and the adhesive used for filling and adhering the terminal box are not particularly limited, but the type thereof is an epoxy resin having good electrical insulation. A system adhesive, a silicone potting agent, a silicone adhesive sealant and the like are preferable, and a silicone resin is preferable in consideration of flexibility and the like. Further, as the adhesive, one having a short curing time in consideration of workability, and one having a viscosity of 300 poise or more is preferable because the viscosity is too low to flow out from the hollow structure. Further, as the filler, one having a viscosity of 1000 poise or less is preferable because the viscosity is not too high and the details of the electrode extraction portion are spread. Also, silicone one-component RT
When V rubber is used, the curing method is preferably a deacetone type or dealcohol type so as not to corrode the electrodes.

Specifically, for example, Three Bond Co, Ltd.
In the epoxy resin adhesive of, the trade name: “2001”,
"2002H", "2003", "2016B", "2"
022 "or the like can be used. These epoxy resins are
Product name: "2102B", "2103", "210"
4 "," 2105F "," 2105C "," 210 "
6, 2131B, 2131D, 2131
F "and" 2163 "can be used by mixing with a predetermined ratio.

Also, "EW-2" (one-pack type), "S / W-2214" (one-pack type), "XA7416" (one-pack type), "JA7437" which are epoxy resins manufactured by Sumitomo 3M.
(One-pack type), "1838B / A" (two-pack type; mixing ratio of this agent and curing agent = 4: 5), "S / W-2216B / A",
"DP-100" (1: 1), "DP-110" (1 =
1), "DP-190" (1: 1), "DP-PURE"
60 "(1: 1)," DP-270 "(1: 1), etc. can be used.

Further, in the epoxy resin of Yuka Shell Epoxy KK, the agent "Epikote" 812, 815, 827,
828, 834 and the like can be used, and the curing agent can be selected according to the required performance.

Further, in the silicone adhesive sealant,
Three Bond Co, Ltd.'s “1220”, “1230”, Toray Dow Corning Silicone Co., Ltd.'s “SE91”
56 ”,“ SE9157 ”,“ SE9166 ”,“ SE
9176 "," SE9185 "," SE9186 ",
"SE9186L", "SE9187", "SE181
1 "," SE1740 "(two-component type)," SE1821 "
(Two-component type), "CY52-005" (two-component type), "SILASTIC 739RTV", "SILASTIC" of Dow Corning Co., Ltd.
"738RTV", "3140RTV", "3145RTV", etc. can be used.

In addition, Shin-Etsu Chemical Co., Ltd. "KE34
7 "," KE3494 "," KE4897 "," KE4
It can be selected from “896”, “KE4895”, “KE66” (two-pack type), “KE67” (two-pack type) and the like.

(Double-sided tape) In the present invention, the double-sided tape used for attaching the terminal box and the solar cell module is not particularly limited, but has a certain thickness, heat resistance, cold resistance, adhesive strength and durability. Excellent things are required. Furthermore, those having excellent waterproof sealing property are preferable,
Those having a strong holding power are preferable.

Specifically, for example, VHB manufactured by Sumitomo 3M
For the joining material, "Y-4959", "Y-4955",
"Y-4950", "Y-4930", "Y-492
0 "," Y-4914 "," Y-4945 "," Y-4 "
922 "," Y-4952 "," Y-4932 "," Y "
-4915, Y-493, Y-4949,
"Y-4929", "Y-4910J", "Y-462
7 "," Y-4630F "," Y-4609 "," Y- "
4615 ”or the like can be used. For Nichiban Co., Ltd. double-sided adhesive tape, "831", "841", "8"
43 ”,“ 843-S ”,“ 844 ”,“ 851 ”,
It can be selected from “853” and the like. Furthermore, in the double-sided adhesive tape of Nitto Denko Corporation, "No. 54
1 ”,“ No. 554 ”,“ No. 5710 ”,“ N
o. 5711 ”,“ No. 5713 ”, and“ No. 57 ”.
5 ”,“ PF-370 ”and the like can be used.

[0027]

By providing a convex shape on the outer peripheral edge of the surface of the hollow structure facing the solar cell module, workability in bonding the hollow structure to the solar cell module is improved,
The adhesive can have a desired thickness, and stable characteristics can be obtained. Further, the adhesive is prevented from protruding when the convex shape is adhered, and the protruding adhesive can be easily wiped off. For this reason, the appearance becomes beautiful, the protruding adhesive is not exposed to sunlight, the adhesion reliability of the hollow structure is improved, and the reliability of the solar cell module itself is also improved.

In addition, by constructing the hollow structure with the base and the upper lid, for example, by removing the upper lid, the insulation protection state of the electrode lead-out portion can be easily confirmed, and the reliability of the terminal lead-out portion of the solar cell module can be confirmed. The property is further improved.

Further, by sticking the convex portion and the solar cell module to each other with the double-sided tape, the protrusion of the adhesive can be further prevented, and the adhesive workability is improved.

Further, by filling the inside of the hollow structure with a filling sealant having a viscosity of 1000 vise or less and adhering the hollow structure to the solar cell module, the filling sealant spreads inside the hollow structure, and the adhesion reliability is improved. The property is improved.

[0031]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

(Example 1) In the terminal lead-out portion structure of the solar cell module according to this example, E was used as the surface coating material.
Using TFE (ethylene tetrafluoroethylene),
A polyester resin-coated steel plate was used as the back surface reinforcing material.

That is, referring to FIG. 2, 13 amorphous solar cell elements 201 were connected in series. Further, a copper tab having an appropriate length as a plus and minus terminal wiring was attached to the back surface of the solar cell element, and solder was attached to the tip of the copper tab to form the electrode lead-out portion 202. At this time, a glass cloth tape was stuck on the back surface of the copper tab to improve insulation.

Then, as shown in FIG. 3, a back surface reinforcing material, a filler, a solar cell element 302 connected in series, a filler and a weather resistant film are laminated in this order, and a vacuum laminator is used.
By melting the filler at 150 ° C., a solar cell module 301 was prepared in which the solar cell element was resin-sealed with a back surface reinforcing material and a weather resistant film. Here, a polyester resin-coated steel plate (0.4 m
m thickness) 303, EVA (ethylene-vinyl acetate copolymer weatherproof grade) 304 as a filler, and ETFE (ethylene tetrafluoroethylene) 305 as a surface film. A hole of φ12 was preliminarily formed in the polyester resin-coated steel plate in order to take out a terminal.

Finally, as shown in FIG. 4, the filler portion of the electrode lead-out portion is hollowed out with a cutter knife or the like to expose the electrode lead-out portion, and about 5 m from the end is previously cut out there.
m The lead wire HKIV401 from which the insulation coating was peeled off was soldered.

Then, the lead wires are previously attached to the hollow structure 404.
Silicon hollow sealant “SILASTIC 739 RTV” 4 made by Dow Corning Co., Ltd. is attached to the surface of the hollow structure 404 facing the solar cell module.
03 was applied, and immediately after that, it was attached to a predetermined position of the solar cell module 406. Then, the hollow structure 404 is pressed until the convex portion 405 having a height of 0.5 mm formed on the outer peripheral edge portion on the adhesive surface contacts the solar cell module 406, and is left as it is for 24 hours, whereby The terminal lead-out portion of the battery module 406 was formed.

In the present embodiment configured as described above, the workability in adhering the hollow structure to the back surface of the solar cell module is improved, and the adhesive can have a desired thickness and is stable. The characteristics could be obtained. Further, the protrusion of the outer peripheral edge suppresses the protrusion of the adhesive, the appearance of the terminal take-out portion becomes beautiful, and since the adhesive is not exposed to the outside, the deterioration of the adhesive can be suppressed.
The adhesion reliability of the hollow structure is improved.

(Embodiment 2) In this embodiment, as in Embodiment 1, as the hollow structure, as shown in FIG. 5, a hollow structure composed of two parts, a base 501 and an upper lid 502, is used. In addition, the lead wire is passed through the through hole of the hollow structure in advance, and the silicone sealant "SILASTIC 739RTV" 503 manufactured by Dow Corning Co., Ltd. is applied to the surface of the base 501 facing the solar cell module 506, and immediately after that, the solar cell is applied. It was attached to the module 506. Then, the hollow structure was pressed down until the convex portion 505 having a height of 0.5 mm formed on the outer peripheral edge portion on the bonding surface was in contact with the solar cell module 506. Then, the top plate through hole 5 of the hollow structure
From 04, until the electrode extraction part is completely hidden, "SILAST
IC 739RTV ”is injected and left as it is for 24 hours. Then, the top cover 502 is inserted into the top plate through hole 504.
By fitting in, the terminal lead-out portion of the solar cell module 506 was formed.

According to the present embodiment, as in the case of the first embodiment, the workability in adhering the hollow structure to the solar cell module 506 is improved, and the adhesive can be made to have a desired thickness. It was possible to obtain the desired characteristics. Further, since the protrusion of the adhesive is suppressed by the convex portion 505 on the outer peripheral edge, the appearance of the terminal lead-out portion becomes beautiful. Further, since the adhesive is not exposed to the outside, deterioration of the adhesive can be suppressed. With these, the adhesion reliability of the hollow structure was improved. Further, the reliability of the terminal lead-out portion of the solar cell module was improved by reliably sealing the electrode lead-out portion after adhering the hollow structure to the solar cell module.

(Example 3) In this example, the terminal lead-out portion of the solar cell module was formed in the same manner as in Example 1 except for the following points. That is, as shown in FIG. 6, after the silicone sealant is applied, Sumitomo 3M Co., Ltd. is provided on the convex portion 602 having a height of 0.5 mm formed on the outer peripheral edge portion on the adhesive surface of the hollow structure 601. VHB bonding material "Y
"4950" 603 was attached after peeling off the release paper, and immediately after peeling off the release paper on the other side, the double-sided tape was pressed so as to adhere to the solar cell module.

In this example, the workability in adhering the hollow structure to the back surface of the solar cell module was improved, and as a result, the adhesive can be made to have a desired thickness and stable characteristics can be obtained. It was The initial adhesive force of the double-sided tape allowed the hollow structure to be securely fixed in a predetermined position, thus improving workability. Further, as a result of the protrusion of the adhesive being suppressed by the convex portion on the outer peripheral edge and the double-sided tape, the appearance of the terminal take-out portion became beautiful. Furthermore, since the adhesive is not exposed to the outside, deterioration of the adhesive can be suppressed and the adhesive reliability of the hollow structure is improved. Further, the reliability of the terminal extraction portion of the solar cell module was improved by reliably sealing the electrode extraction portion after adhering the hollow structure to the back surface of the solar cell module.

(Embodiment 4) In Embodiment 2, as shown in FIG. 7, the lead wire is preliminarily provided with the through hole 701 of the hollow structure 704.
VHB bonding material “Y4950” 705 manufactured by Sumitomo 3M Ltd. on the convex portion 702 having a height of 0.5 mm formed on the outer peripheral edge portion on the bonding surface of the base portion.
After peeling off the release paper, and immediately after peeling off the release paper on the other side, the double-sided tape is pressed so as to adhere to the solar cell module, and then Shin-Etsu Chemical Co., Ltd. silicone one-liquid RTV "KE4896" 703 The hollow structure 704
The hollow structure 704 was adhered to the solar cell module by filling the interior of the solar cell module and left as it was for 24 hours to form a terminal lead-out portion of the solar cell module.

According to this example, the workability in adhering the hollow structure to the back surface of the solar cell module was improved, the adhesive could be made to have a desired thickness, and stable characteristics could be obtained. Moreover, the protrusion of the adhesive was suppressed by the convex portion of the outer peripheral edge, and the appearance of the terminal lead-out portion became beautiful. Furthermore,
Since the adhesive is not exposed to the outside, deterioration of the adhesive can be suppressed. With these, the adhesion reliability of the hollow structure was improved. Further, the reliability of the terminal lead-out portion of the solar cell module was improved by reliably sealing the electrode lead-out portion after bonding the hollow structure to the back surface of the solar cell module.

[0044]

According to the present invention, the hollow structure is provided with a convex shape on the outer peripheral edge of the surface of the hollow structure for insulating and protecting the electrode lead-out portion of the solar cell module, the surface facing the solar cell module. The workability when bonding to the battery module is improved, the adhesive can be made to the desired thickness, stable characteristics can be obtained, and the convex shape prevents the adhesive from protruding when bonding. Or,
Alternatively, the adhesive that sticks out can be easily wiped off, the appearance becomes beautiful, and the adhesive that sticks out is not exposed to sunlight, so the bonding reliability of the hollow structure is improved, and the solar cell module is further improved. The reliability of itself has improved.

Further, by forming the hollow structure with the base and the upper lid, the insulation protection state of the electrode lead-out portion can be easily confirmed, and the reliability of the terminal lead-out portion of the solar cell module is further improved.

Further, by sticking the convex portion and the solar cell module to each other with the double-sided tape, the protrusion of the adhesive can be further prevented, and the bonding workability is improved. Further, by bonding the hollow structure to the solar cell module using a filling sealant having a viscosity of 1000 poise or less for adhesion, the filling sealant was spread inside the hollow structure, and the adhesion reliability was improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a schematic configuration of a solar cell module according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram in which solar cell elements are connected in series in Example 1 of the present invention.

FIG. 3 is an explanatory diagram of a schematic configuration of the solar cell module according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of a terminal box attached to the solar cell module according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a terminal box attached to a solar cell module according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a terminal box attached to a solar cell module according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a terminal box attached to a solar cell module according to a fourth embodiment of the present invention.

[Explanation of symbols]

101, 303 back surface reinforcing material, 102, 302 solar cell element, 103, 304, 703 filling material, 104, 305 weather resistant film, 105 terminal box, 201 amorphous solar cell element, 202 electrode extraction part, 301, 406, 506, 702 solar cell module, 401 lead wire, 402 through hole, 403, 503, 701 sealant, 404, 601, 704 hollow structure, 405, 505, 602 convex part, 501 base part, 502 upper lid part, 504 top plate part penetration Hole, 603,705 Double-sided tape.

Claims (4)

[Claims] 1. A terminal lead-out structure for a solar cell module having a hollow structure for insulating and protecting the electrode lead-out portion of the solar cell module, wherein the hollow structure has an outer peripheral edge portion of a surface facing the solar cell module. A terminal lead-out structure of a solar cell module, which has a convex shape and is adhered to the solar cell module with an adhesive. 2. The terminal lead-out structure for a solar cell module according to claim 1, wherein the hollow structure is composed of a base and an upper lid, and the convex shape is formed on the base. 3. The terminal lead-out structure of a solar cell module according to claim 1, wherein the convex shape and the solar cell module are attached to each other with a double-sided tape. 4. The terminal of the solar cell module according to claim 2, wherein the base is bonded to the solar cell module by filling a filling sealant having a viscosity of 1000 poise or less inside the hollow structure. Take-out structure.