WO2012117891A1

WO2012117891A1 - Output wire for solar cell modules, solar cell module, and method for manufacturing same

Info

Publication number: WO2012117891A1
Application number: PCT/JP2012/054099
Authority: WO
Inventors: 瞳一之瀬
Original assignee: 三洋電機株式会社
Priority date: 2011-02-28
Filing date: 2012-02-21
Publication date: 2012-09-07

Abstract

The purpose of the present invention is to improve the reliability of a solar cell module by preventing penetration of moisture from a slit even in cases when water has penetrated into the space between a bottom surface member of a terminal box and a backside protective member. A solar cell module which is provided with: a frontside protective member (12); a backside protective member (13); a plurality of solar cells (11) that are electrically connected by a wiring member (16); a sealing member (14) that seals the plurality of solar cells between the frontside protective member (12) and the backside protective member (13); and an output wire (20) for taking out the output of the solar cells (11). The backside protective member (13) is provided with a slit (13s), and the output wire (20) is drawn out from the slit (13s) to the outside of the backside protective member (13). At least the slit (13s) portion is provided with a resin for preventing moisture penetration (30) over the range from the output wire (20) to the backside protective member (13).

Description

Output wiring of solar cell module, solar cell module and manufacturing method thereof

The present invention relates to an output wiring of a solar cell module, a solar cell module, and a manufacturing method thereof.

Solar cells are expected as a new energy source because they can directly convert clean and infinitely supplied sunlight into electricity.

Generally, the output per solar cell is about several watts. For this reason, when a solar cell is used as a power source for a house, a building, or the like, a solar cell module whose output is increased by connecting a plurality of solar cells is used. The solar cell module has a structure in which a plurality of solar cells are connected in series or in parallel by a wiring member.

The above-described solar cell module is obtained by disposing a plurality of solar cells connected by wiring members between a translucent surface protective member and a back surface protective member, and an ethylene / vinyl acetate copolymer (EVA). It is comprised by sealing with resin which has as a main component. Thereby, the weather resistance and impact resistance of the solar cell module can be improved, and a practical electrical output can be taken out outdoors.

The above-mentioned solar cell module is often provided with a terminal box for taking out the output of the solar cell on the back side. In a solar cell module provided with a terminal box on the back surface side, a slit is provided in the back surface protection member in order to extract the output of the solar cell to the back surface side, and output wiring is taken out from this slit.

The solar cell module has a problem that the solar cell deteriorates when water penetrates inside. For this reason, it is necessary to prevent water from entering from the slit provided in the back surface protection member.

In Patent Document 1, the bottom material of the terminal box is positioned on the slit, and the output wiring is taken in from the through hole provided adjacent to the bottom material, and the slit is covered with the bottom member of the terminal box. Thus, solar cell modules that prevent water from entering through the slits have been proposed.

JP 2003-282915 A

In the solar cell module described in Patent Document 1, the bottom surface member of the terminal box covers the slit of the back surface protection member to prevent water from entering from the slit. However, in the solar cell module of Patent Document 1 described above, the slit portion remains open, and when water enters between the bottom surface member and the back surface protection member, water penetrates into the solar cell module from the slit portion. There is a risk of doing. When water penetrates into the solar cell module, problems such as deterioration of the characteristics of the solar cell module occur.

An object of the present invention is to prevent moisture permeation from the slit and improve the reliability of the solar cell module.

The output wiring of the solar cell module of the present invention is drawn out from a slit provided in the back surface protection member of the solar cell module in which a plurality of solar cells are sealed with a sealing material between the front surface protection member and the back surface protection member. In order to take out the output of the solar cell, the output wiring is coated with a resin for preventing moisture permeation at least at a position located in the slit.

The solar cell module of the present invention includes a surface protection member, a back surface protection member, a plurality of solar cells disposed between the surface protection member and the back surface protection member and electrically connected by a wiring member, and the surface A solar cell module comprising a sealing member for sealing the plurality of solar cells and an output wiring for taking out the output of the solar cell between the protective member and the back surface protective member, wherein the back surface protection A slit is provided in the member, and the output wiring is taken out of the back surface protection member from the slit, and at least the slit portion is provided with a resin for preventing moisture permeation from the output wiring to the back surface protection member. Yes.

The manufacturing method of the solar cell module of the present invention is connected to the surface protection member, the front surface side sealing resin sheet, the plurality of solar cells connected by the wiring member, the back surface side sealing resin sheet, and the solar cell from below. The back surface protection member in which the output wiring is inserted into the slit is disposed in this order, and a hot-melt resin for preventing moisture penetration is disposed at least in a position including the slit, and the pressure is applied while heating. The hot-melt resin for preventing penetration is melted and integrated, and the solar cell is sealed in a state sandwiched between the surface protection member and the back surface protection member. A moisture penetration preventing resin is provided across the protective member.

Since the moisture permeation preventing resin is provided in the slit portion of the back surface protection member from the output wiring to the back surface protection member, it is possible to prevent the water from permeating from the slit.

It is a schematic sectional drawing of the solar cell module which concerns on 1st Embodiment. It is a top view which shows the output wiring part of the solar cell module of 1st Embodiment. It is a schematic diagram which shows the output wiring used for 1st Embodiment. It is a top view which shows the output wiring and slit part of the solar cell module of 1st Embodiment. It is a fragmentary sectional view which shows the extraction part of the output wiring before the lamination of 1st Embodiment. It is a schematic block diagram of the manufacturing apparatus which manufactures the solar cell module of 1st Embodiment. It is a fragmentary sectional view which shows the taking-out part of the output wiring of the solar cell module of 1st Embodiment. It is a schematic diagram which shows the output wiring used for 2nd Embodiment. It is a top view which shows the output wiring part of the solar cell module of 2nd Embodiment. It is a fragmentary sectional view which shows the taking-out part of the output wiring of the solar cell module of 2nd Embodiment. It is a top view which shows the slit part of the solar cell module of 3rd Embodiment.

The first embodiment will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated in order to avoid duplication of description. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

A schematic configuration of the solar cell module 10 according to the first embodiment will be described with reference to FIG. FIG. 1 is an enlarged side sectional view of a solar cell module 10 according to the first embodiment.

The solar cell module 10 includes a solar cell 11, a surface protection member 12, a back surface protection member 13, and a sealing member 14. The solar cell module 10 is configured by sealing a plurality of solar cells 11 between the surface protection member 12 and the back surface protection member 13.

The plurality of solar cells 11 are connected to each other by the wiring member 16. The solar cell 11 and the wiring member 16 are connected using solder or a resin adhesive.

The plurality of solar cells 11 connected by the wiring member 16 constitutes a string that is one unit. The plurality of strings are connected by connection wiring 21. A part of the connection wiring 21 is connected to the output wiring 20 for outputting electricity to the outside.

The solar cell 11 is made of, for example, a crystalline semiconductor made of single crystal silicon or polycrystalline silicon having a thickness of about 0.15 mm, and has a substantially square shape with one side being 100 mm. The size and material of the solar cell 11 are not limited to this, and other solar cells may be used.

This solar cell 11 has, for example, an n-type region, a p-type region, and a junction provided between the n-type region and the p-type region. An electric field for carrier separation is formed at the junction.

The solar cell 11 includes an electrode connected to the n-type region or the p-type region. The wiring member 16 is connected to the electrode of one solar cell 11 and the electrode of the other solar cell 11 in the plurality of solar cells 11 provided adjacent to each other. Thereby, the adjacent

solar cells

11 and 11 are electrically connected. For example, the wiring member 16 includes a thin plate-like copper foil and solder that covers the surface of the copper foil.

When the wiring member 16 and the solar cell 11 are connected by solder, the solder covering the surface of the wiring member 16 is melted and connected to the wiring member 16 and the electrode of the solar cell 11. Note that the solar cell 11 and the wiring member 16 can be connected using a resin adhesive in addition to the connection using solder. As the resin adhesive, a resin adhesive having anisotropic conductivity is preferably used.

The surface protection member 12 is disposed on the light receiving surface side of the sealing member 14 and protects the surface of the solar cell module 10 on the light receiving surface side. As the surface protection member 12, glass having translucency and water shielding properties, translucent plastic, or the like can be used.

The back surface protection member 13 is disposed on the back surface side of the sealing member 14 and protects the back surface of the solar cell module 10. As the back surface protection member 13, a resin film such as PET (Polyethylene Terephthalate), a laminated film having a structure in which an aluminum foil is sandwiched between resin films, or the like can be used. In 1st Embodiment, the back surface protection member 13 is comprised with the laminated | multilayer film which has the structure which pinched | interposed the aluminum foil 13b with the resin film 13a.

The sealing member 14 seals the plurality of solar cells 11 between the surface protection member 12 and the back surface protection member 13. The sealing member 14 disposed between the surface protection member 12 and the solar cell 11 has translucency. The sealing member 14 is selected from ethylene / vinyl acetate copolymer (EVA), polyolefin, cyclic polyethylene, ionomer, polyacrylic acid polymer, or a copolymer obtained by polymerizing a plurality of these. In the first embodiment, EVA resin is used.

Note that an aluminum frame (not shown) can be attached to the outer periphery of the solar cell module 10 having the above-described configuration.

The wiring member 16 is connected directly or via the connection wiring 21 to the output wiring 20 for taking out the output to the outside of the module. The output wiring 20 is connected to the terminal of the terminal box 40 through the slit 13 s provided in the back surface protection member 13. The output wiring 20 is obtained by cutting a copper foil having a thickness of about 0.1 mm to 0.3 mm and a solder coating on the entire surface thereof into a predetermined length, and is connected to the wiring member 16 or the connection wiring 21. Soldered.

In the first embodiment, the surface of the output wiring 20 is covered with a moisture penetration preventing resin 30 made of a hot melt resin. Specifically, butyl having excellent water repellency and insulation is used for the moisture penetration preventing resin 30. The moisture permeation preventing resin 30 is not limited to butyl, and any resin may be used as long as it can melt at the time of laminating to close the slit 13s and suppress the penetration of moisture from the slit 13s. For example, as the resin 30 for preventing moisture permeation, styrene-isoprene-styrene block copolymer system (“SIS system”), styrene-butadiene-styrene block copolymer system (“SBS system, SBR system”) and their hydrogenated deformation ( For example, styrene-ethylene-butylene-styrene (“SEBS”), styrene-ethylene-propylene-styrene (such as “SEPS”) block copolymers, styrene block copolymers are used, but amorphous polymers A hot melt resin that also uses α-olefin (APAO), or a rubber-based, butyl rubber-based, synthetic resin-based, olefin-based, EVA-based, or acrylic polymer-based resin can be used. In addition, the water penetration preventing resin 30 has higher water repellency than the sealing material 14. Preferred. For example, JIS K7129 B method water vapor permeability is measured based on the MOCON method pursuant to (infrared sensor method), used not more than 1.0g ^/ m 2 · day for the resin 30 to prevent moisture penetration It is preferable.

Further, when a laminated film having a structure in which an Al foil is sandwiched between resin films is used as the back surface protection member 13, the moisture permeation preventing resin 30 is preferably insulative. By using the insulating water penetration preventing resin 30, it is possible to prevent contact between the output wiring 20 and the Al foil of the back surface protection member 13, and to prevent current from leaking. As insulation, it is preferable that the dielectric breakdown voltage measured based on the dielectric breakdown voltage test prescribed | regulated to JISC2110 is 5 kV or more.

The rear surface protection member 13 is provided with a slit 13s for taking out the output wiring 20. The sheet member constituting the sealing member 14 on the back side is also provided with a slit 14c for taking out the output wiring 20 as will be described later. The

slits

13s and 14c have a width wider than the thickness of the output wiring 20, and have a length that allows the plurality of output wirings 20 to be inserted in parallel.

The terminal box 40 is attached so as to cover the slit 13s of the back surface protection member 13. Silicone resin or the like is used for bonding the back surface protective material 13 and the terminal box 40. The output wiring 20 taken out from the slit 13s is connected to a terminal in the terminal box 40 and is connected to an external circuit.

The extraction of the output wiring 20 from the solar cell module 10 will be described with reference to FIGS. FIG. 2 is a plan view showing the arrangement of the output wirings 20 ₁ to 20 ₄ of the solar cell module 10 according to the first embodiment, and FIG. 3 is a schematic diagram showing the output wiring used in the first embodiment. These are the top views which show the output wiring 20 and the slit 13s of the solar cell module 10 of 1st Embodiment, FIG. 5 is a fragmentary sectional view which shows the taking-out part of the output wiring before lamination of 1st Embodiment.

In FIG. 2, six strings are connected in series using connection wirings 21. Based on the state of the slit 13s and the horizontal, the leftmost of the connected output lines 20 ₁ to the connection wiring 21 of the string is pulled out from the slit 13s. Second and third string from the left are connected by connection wiring 21, connected output line 20 ₂ is drawn out from the slit 13s of the back surface protective film 13 on the connecting wire 21.

Further, the rightmost of the connected output line connecting wire 21 of the string 20 ₄ is drawn from the slit 13s. The second from the right and third strings are connected by connection wiring 21, connection wiring 21 connected to the output line 20 ₃ is drawn out from the slit 13s of the back surface protective film 13.

In this way, the output lines 20 ₁ to 20 ₄ respectively connected to the six strings are drawn out from the slits 13s of the back surface protection member 13, and then connected to predetermined terminals of the terminal box 40, so that the solar cell module Is configured.

In the first embodiment, there are _four output wires 20 (20 ₁ to 20 ₄ ) derived from the slits 13s. For this reason, the terminal block of the terminal box 40 is provided with four terminals, to which the corresponding output lines 20 ₁ to 20 ₄ are respectively connected. A backflow prevention diode is connected between the terminals of the four terminals. The output wirings 20 (20 ₁ to 20 ₄ ) derived from the slit 13s may be two for taking out positive and negative outputs.

4 and 5, slits 14c and 13s are formed in the back surface side sealing member 14b and the back surface protection member 13, respectively. The output wiring 20 covered with the moisture penetration preventing resin 30 made of hot melt resin as shown in FIG. 3 is inserted into the

slits

14c and 13s.

Slit 13s has a width greater than the thickness of the output interconnection 20 ₍₂₀ 1 to 20 ₄₎ has a length which can be inserted a plurality of output lines 20 ₍₂₀ 1 to 20 ₄₎ in parallel.

The output wiring 20 (20 ₁ to 20 ₄ ) led out from the slit 13s is taken out from the back surface protection member 13 of the solar cell module 10 at a predetermined length and interval.

As shown in FIG. 5, when manufacturing the solar cell module 10, a plurality of solar cells 11 connected by a surface protection member 12, a surface side EVA sheet 14 a (sealing member sheet), and a wiring member 16 from below. ..., the EVA sheet 14b (sealing member sheet) and the back surface protection member 13 are stacked in this order. In the slit 13 s of the back surface protection member 13, an output wiring 20 having a surface coated with a water permeation preventing resin 30 made of a water-repellent and insulating hot melt resin is inserted. The members arranged in this way are laminated by a laminating apparatus.

As shown in FIG. 7, after lamination, the moisture penetration preventing resin 30, which is melted and hardened by the hot melt resin, is located across the back surface protection member 13 from the output wiring 20 in the slit 13 s. For this reason, the slit 13s is covered with the water penetration preventing resin 30 having excellent water repellency and insulation, and water penetration from the slit 13s is suppressed. Then, the bottom portion 40 a of the terminal box 40 is bonded to the location of the slit 13 s of the back surface protection member 13 with the silicone resin 50. The output wiring 20 is connected to the terminal block 40 b in the terminal box 40. And although not shown in figure, the solar cell module 10 is comprised by attaching the case upper cover of the terminal box 40. FIG.

Next, a method for manufacturing the solar cell module 10 will be described with reference to FIG. FIG. 6 is a schematic configuration diagram of a manufacturing apparatus for manufacturing the solar cell module 10. The apparatus includes a lower housing 200 and an upper housing 202 that is airtightly coupled to the lower housing. A heater plate 201 is disposed in the upper opening of the lower housing 200 in a substantially flush state. The upper housing 202 is provided with a rubber diaphragm 203 on the side facing the opening of the lower housing 200. A packing 204 for holding an airtight state when the two are joined is attached to the peripheral portions of the lower housing 200 and the upper housing 202 over the entire circumference.

Furthermore, although not shown, a vacuum pump is connected to the lower housing 200.

In manufacturing the solar cell module 10, first, on the heater plate 201 of the manufacturing apparatus, the surface protection member 12, the EVA sheet 14 a on the surface side, the plurality of solar cells 11... The protection members 13 are stacked in this order. An output wiring 20 whose surface is coated with a water-repellent and insulating hot melt resin is inserted into the slit 13s of the back surface protection member 13, and the output wiring 20 is positioned at a predetermined position and temporarily held.

After the components are stacked on the heater plate 201 as described above, the lower housing 200 and the upper housing 202 are joined. Thereafter, the lower housing 200 is evacuated by a vacuum pump (not shown). At this time, the heater plate 201 is heated to about 130 ° C. to 200 ° C. In this state, the diaphragm 203 is pressed against the solar cell module 10 placed on the heater plate 201. Then, the

EVA sheets

14 a and 14 b are gelled to form a predetermined EVA layer 14. Further, the moisture penetration preventing resin 30 made of hot melt resin is also melted and laminated integrally with the EVA layer so as to close the slit 13s. Thus, the solar cells 11 are sealed in the EVA layer 14 while being sandwiched between the front surface side protection member 12 and the rear surface side protection member 13. A part of the moisture permeation preventing resin 30 enters and is integrated into the slit 14c of the EVA sheet 14b, and the slit 14c is closed. The slit 13s of the back surface protection member 13 is also integrated with a part of the hot melt resin 30 entering, and the slit 13s is closed.

Thereafter, the terminal box 40 is attached to the back surface protection member 13 by the silicone resin 50.

As shown in FIG. 7, in the first embodiment, a moisture penetration preventing resin 30 is provided at a location where the slit 13 s of the back surface protection member 13 is provided. The moisture penetration preventing resin 30 can suppress moisture intrusion from the slit 13s.

In the first embodiment, after the moisture penetration preventing resin 30 is coated on the output wiring 20, the output wiring 20 is led out from the slit 13s, and the moisture penetration preventing resin 30 is melted and cured to close the slit 13s. Yes. By manufacturing in this way, the slit 13 s can be closed without leaving a space between the output wiring 20 and the back surface protection member 13.

Next, a second embodiment will be described with reference to FIGS. FIG. 8 is a schematic diagram showing the output wiring 20 used in the second embodiment, FIG. 9 is a plan view showing the output wiring 20 and the slit 13s of the solar cell module of the second embodiment, and FIG. It is a fragmentary sectional view showing an extraction portion of output wiring 20 before lamination of a 2nd embodiment.

In the second embodiment, as shown in FIG. 8, the output wiring 20 covered with an insulating tape 25 is used. After the output wiring 20 (20 ₁ to 20 ₄ ) is taken out from the slit 13s of the back surface protection member 13, as shown in FIG. 9, moisture permeation made of a water-repellent hot melt resin such as butyl is closed so as to close the slit 13s. The prevention resin 30a is applied. After that, by performing a laminating process, as shown in FIG. 10, the moisture penetration preventing resin 30 a, which is melted and cured by the hot melt resin, extends from the output wiring 20 to the back surface protection member 13 at the slit 13 s. To position. For this reason, the slit 13s is completely covered with the water penetration preventing resin 30a excellent in water repellency and insulation, and water penetration from the slit 13s is prevented. And the bottom part 40a of the terminal box 40 is adhere | attached by the silicone resin 50 etc. in the location of the slit 13s of the back surface protection member 13. FIG. The output wiring 20 is connected to the terminal block 40 b in the terminal box 40. And although not shown in figure, the solar cell module 10 is comprised by attaching the case upper cover of the terminal box 40. FIG.

In the second embodiment, after covering the output wiring 20 with the insulating tape 25, the output wiring 20 (20 ₁ to 20 ₄ ) is led out from the slit 13s, and the moisture permeation preventing resin 30 is provided and melted and cured. The slit 13s is closed. By manufacturing in this way, the slit 13 s can be closed while the electrical insulation between the output wiring 20 (20 ₁ to 20 ₄ ) and the back surface protection member 13 is reliably maintained.

Next, a third embodiment will be described with reference to FIG. In the third embodiment, the output wiring 20 is coated with a water penetration preventing resin 30 made of butyl, and the output wiring 20 (20 ₁ to 20 ₄ ) is further connected to the slit 13s of the back surface protection member 13. After the removal, as shown in FIG. 11, a moisture penetration preventing resin 30a made of butyl is applied so as to close the slit 13s. Thereafter, lamination is performed, and the slit 13s is more reliably closed with the moisture

permeation preventing resins

30 and 30a. By comprising in this way, waterproofness improves further.

In the third embodiment, it is possible to obtain both the waterproof property obtained by the first embodiment and the insulating property obtained by the second embodiment.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

10 solar cell module 11 solar cell 12 surface protective member 13 back protective member 13s slit 14 sealing member 16 wiring member 20 output lines 20 ₁ to 20 ₄

output lines

30,30a moisture permeation preventive resin

Claims

Between the surface protection member and the back surface protection member, a plurality of solar cells are drawn out from a slit provided in the back surface protection member of the solar cell module sealed with a sealing material, and output for taking out the output of the solar cell Wiring,
The output wiring is an output wiring of a solar cell module, wherein at least a portion located in the slit is coated with a resin for preventing moisture penetration.
The output wiring of the solar cell module according to claim 1, wherein the moisture penetration preventing resin is made of a resin having water repellency and insulating properties.
The output wiring of the solar cell module according to claim 1 or 2, wherein the moisture penetration preventing resin has a dielectric breakdown voltage of 5 kV or more.
4. The solar cell module output wiring according to claim 1, wherein the moisture penetration preventing resin has a water vapor permeability of 1.0 g / m 2 · day or less. 5.
A surface protection member;
A back surface protection member;
A plurality of solar cells disposed between the surface protection member and the back surface protection member and electrically connected by a wiring member;
Between the surface protection member and the back surface protection member, a sealing member that seals the plurality of solar cells;
An output wiring for taking out the output of the solar cell, and a solar cell module comprising:
A slit is provided in the back surface protection member, and the output wiring is taken out from the slit to the outside of the back surface protection member, and at least the slit portion is made of a resin for preventing moisture permeation across the back surface protection member from the output wiring. A solar cell module provided.
6. The solar cell module according to claim 5, wherein a water penetration preventing resin made of a hot melt resin is provided around the output wiring, and is melted and integrated with the sealing member.
The solar cell module according to claim 6, wherein the hot melt resin is made of a resin having water repellency and insulation.
The solar cell module according to claim 5, wherein the surface protection member is glass or plastic having translucency, and the back surface protection member is a resin film.
The solar cell module according to claim 6 or 7, wherein the hot melt resin has a dielectric breakdown voltage of 5 kV or more.
10. The solar cell module according to claim 6, wherein the hot melt resin has a water vapor permeability of 1.0 g / m 2 · day or less.
Connecting output wiring to a plurality of solar cells connected by wiring members;
The surface protective member and the front surface side sealing member are provided so that the output wiring is led out to the slit provided in the rear surface side sealing member, and the moisture penetration preventing resin is provided across the back surface protective member from the output wiring. A step of arranging the plurality of solar cells, the sealing member on the back surface side, and the back surface protection member in this order;
The surface protection member, the surface side sealing member, the plurality of solar cells, the back surface side sealing member, and the back surface protection member are pressurized while being heated, and the sealing member and the moisture penetration preventing resin are melted. And a process of
A method for manufacturing a solar cell module comprising:
The method for manufacturing a solar cell module according to claim 11, wherein the moisture penetration preventing resin has a dielectric breakdown voltage of 5 kV or more.
The method for producing a solar cell module according to claim 11 or 12, wherein the moisture penetration preventing resin has a water vapor permeability of 1.0 g / m 2 · day or less.
Prior to the step of connecting the output wiring, further comprising the step of coating the output wiring with a resin for preventing moisture penetration,
The method of manufacturing a solar cell module according to claim 11, wherein a resin for preventing moisture permeation is provided across the back surface protection member from the output wiring by deriving the output wiring from the slit.