KR20140075925A - Back sheet for solar cell module and solar cell module comprising the same - Google Patents

Back sheet for solar cell module and solar cell module comprising the same Download PDF

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KR20140075925A
KR20140075925A KR1020120143456A KR20120143456A KR20140075925A KR 20140075925 A KR20140075925 A KR 20140075925A KR 1020120143456 A KR1020120143456 A KR 1020120143456A KR 20120143456 A KR20120143456 A KR 20120143456A KR 20140075925 A KR20140075925 A KR 20140075925A
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film layer
solar cell
polyester film
cell module
back sheet
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KR1020120143456A
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Korean (ko)
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KR101423402B1 (en
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강한준
윤성환
전승환
양승영
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율촌화학 주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

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  • Photovoltaic Devices (AREA)
  • Laminated Bodies (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)

Abstract

The present invention relates to a back sheet for a solar cell module having adhesion and barrier properties (such as humidity prevention) while having reinforced weather resistance, and to a solar cell module comprising the same. The back sheet for a solar cell module comprises a first polyester film layer as a base material; a second polyester film layer laminated on the first polyester film layer; and a polyolefin film layer laminated on the second polyester film layer, wherein the first polyester film layer contains an oligomer and a white inorganic material, and the polyolefin film layer contains white inorganic material.

Description

TECHNICAL FIELD [0001] The present invention relates to a back sheet for a solar cell module, and a solar cell module including the back sheet. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back sheet for a solar cell module and a solar cell module including the back sheet. More particularly, the present invention relates to a back sheet for a solar cell module having improved adhesion and barrier properties And a solar cell module including the same.

Recently, a solar cell has been developed as a next-generation eco-friendly energy source, and it is rapidly spreading for residential use and industrial use.

A solar cell is formed by modularizing a plurality of solar cells. At this time, a plurality of solar cells are packed and fixed to the sealing layer, and a back sheet as a sealing member is adhered to the lower surface of the sealing layer to be modularized. This will be described with reference to FIG. FIG. 1 is a sectional view of a conventional solar cell module according to the related art, in which a back sheet according to the related art is shown.

1, a solar cell module generally includes a transparent tempered glass 3, an upper sealing layer 2a, a plurality of solar cell C, a lower sealing layer 2b, and a back sheet 1 ) Are stacked in this order. A plurality of solar cells C are packed and fixed to the sealing layers 2a and 2b. That is, as shown in FIG. 1, a plurality of solar cells C are packed and fixed between the upper encapsulation layer 2a and the lower encapsulation layer 2b. At this time, ethylene vinyl acetate (EVA), which is advantageous for packing (fixing) the solar cell C, is mainly used for the sealing layers 2a and 2b. The back sheet 1 is adhered to the lower part of the solar cell module, that is, the lower surface of the lower sealing layer 2b to protect the solar cell C.

The solar cell module is required to have a long life without a reduction in output over a long period of time. For such longevity, the back sheet 1 should be able to block moisture and oxygen which adversely affect the solar cell C, and to prevent deterioration due to ultraviolet rays or the like. In addition, in recent years, the price of the back sheet 1 has been strongly demanded. Accordingly, the backsheet 1 should be made of a material having heat resistance, durability, weather resistance, etc. that can withstand high temperature, humidity, ultraviolet rays, etc. in order to increase the life span of the solar cell module. .

Generally, the back sheet 1 for a solar cell module has a structure in which a heat-resistant polyethylene terephthalate (PET) film and a weather-resistant fluorine-based film are laminated as a base substrate. Specifically, as shown in Fig. 1, the back sheet 1 includes a PET film 1a as a base substrate and a fluorine-based film 1b bonded to the PET film 1a through an adhesive. Korean Patent No. 10-1022820 and Korean Patent Laid-open No. 10-2011-0020227 disclose techniques related to this.

The PET film 1a is excellent in heat resistance and durability such as mechanical strength and is useful as a base material for the back sheet 1. [ The fluorine-based film 1b is mainly made of polyvinylidene fluoride (PVDF) or polyvinyl fluoride (PVF). The fluorine-based film 1b is excellent in weather resistance and the like There are advantages.

However, the conventional backsheet 1 has a problem that the price of the constituent material is high and the price competitiveness is low. Specifically, in constituting the backsheet 1, a fluorine-based film 1b such as PVDF or PVF molded in the form of a film as described above is adhered to the PET film 1a through an adhesive for weather resistance At this time, the fluorine-based film 1b such as PVDF or PVF has a problem that the price of the backsheet 1 is not reduced because of the high price of the film itself.

In addition, the conventional backsheet 1 has low durability due to weak interlaminar adhesion between layers constituting the backsheet 1 and modularization, and is also excellent in terms of barrier properties such as moisture barrier properties There is a problem. Specifically, although the PET film 1a and the fluorine-based film 1b are bonded through an adhesive, there is a problem that the interlaminar adhesive force between these two films 1a and 1b is weak. In addition, the back sheet 1 must be firmly adhered to the lower encapsulating layer 2b of the solar cell module, that is, the EVA sheet to maintain the sealability. However, since the adhesive strength between the fluorine-containing film 1b and the EVA sheet is weak, . In addition, the fluorine-based film (1b) is advantageous in weatherability, but has a high moisture permeability and poor barrier properties such as moisture barrier properties.

Korean Patent No. 10-1022820 Korea Patent Publication No. 10-2011-0020227

Accordingly, it is an object of the present invention to provide a back sheet for a solar cell module which can be supplied at a low cost, is excellent in adhesion and barrier properties (such as moisture barrier properties) and weather resistance, and a solar cell module comprising the same. There is a purpose.

In order to achieve the above object, a back sheet for a solar cell module according to the present invention comprises a first polyester film layer as a base substrate, a second polyester film layer laminated on the first polyester film layer, And a polyolefin film layer laminated on the polyester film layer, wherein the first polyester film layer contains an oligomer and a white inorganic material, and the polyolefin film layer contains a white inorganic material .

The first polyester film layer contains 0.5 to 0.8 wt% of oligomers based on the weight of the polyester-based resin. In addition, the first polyester film layer contains 2-15 wt% of a white inorganic material based on the weight of the polyester-based resin. In addition, the polyolefin film layer contains 2 to 15 wt% of a white inorganic material based on the weight of the polyolefin-based resin.

The first polyester film layer and the second polyester film layer include at least one selected from polyethylene terephthalate (PET) and polyethylene naphthalate (PEN).

The white inorganic material includes titanium dioxide (TiO 2 ), and the white inorganic material has a particle size of 0.1 to 10 μm.

According to the present invention, it can be supplied at an inexpensive price, and has an excellent effect of weather resistance and hydrolysis resistance.

1 is a cross-sectional view of a conventional solar cell module and a back sheet.
2 is a cross-sectional view of a back sheet for a solar cell module according to an exemplary embodiment of the present invention.
3 is a cross-sectional view of a solar cell module according to an exemplary embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 2 is a cross-sectional view of a back sheet for a solar cell module according to the present invention. FIG. 3 is a cross-sectional view of a solar cell module according to the present invention. FIG. .

2, a back sheet 10 for a solar cell module (hereinafter abbreviated as "back sheet") according to the present invention includes a first polyester film layer 12 as a base substrate, And a second polyester film layer (14) and a polyolefin film layer (16) sequentially laminated on the first polyester film layer (12). Also, the first polyester film layer 12 contains an oligomer and a white inorganic material, and the polyolefin film layer 16 contains a white inorganic material.

The first polyester film layer 12 and the second polyester film layer 14 are composed of a polyester film. At this time, the first polyester film layer 12 or the second polyester film layer 14 may be composed of one polyester film or may be composed of a laminate of two or more polyester films. In the present invention, the polyester film is not limited as long as it contains a polyester-based resin. For example, the polyester film may be formed into a film by molding a composition comprising a polyester-based resin obtained by polymerizing a compound having a carboxyl group and a compound having a hydroxyl group Can be used.

The first polyester film layer 12 and the second polyester film layer 14 are preferably made of a polyester resin such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or the like, which is advantageous in terms of heat resistance and mechanical strength, Polybutylene terephthalate (PBT) and polybutylene naphthalate (PBN), and the like. More preferably, the first polyester film layer 12 and the second polyester film layer 14 are made of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) having ethylene in the molecule And the like. More specifically, the first polyester film layer 12 and the second polyester film layer 14 are preferably composed of a polyethylene terephthalate film (PET film) or a polyethylene naphthalate film (PEN film).

The second polyester film layer 14 is not particularly limited, but may have a thickness of, for example, 50 to 1,000 m. If the thickness of the polyester film layer is less than 50 탆, the barrier property, heat resistance, mechanical strength (tensile strength, etc.) and dimensional stability may not be good. If the thickness is more than 1,000 탆, May be undesirable. In consideration of this point, the second polyester film layer 14 preferably has a thickness of 80 to 500 mu m, more preferably 100 to 300 mu m.

On the other hand, the first polyester film layer 12 contains an oligomer and a white inorganic substance as described above. The first polyester film layer 12 specifically contains a polyester-based resin, an oligomer and a white inorganic material.

The oligomer serves to improve the hydrolysis resistance and weather resistance of the first polyester film layer 12. The oligomer is contained in an amount of 0.5 to 0.8 wt% based on the weight of the polyester-based resin. When the oligomer content is more than 0.8 wt%, the stability of the film layer is lowered and the possibility of hydrolysis is increased, and the polymerization reaction is promoted. Therefore, the content of the oligomer is preferably 0.5 to 0.8 wt% in consideration of the stability of the film layer and hydrolysis resistance.

An oligomer which is an intermediate between a monomer and a polymer is a low polymer having a repeating number of structural units (degree of polymerization) of 2 to 20. The content of the oligomer can be found by means of Nuclear Magnetic Resonance (NMR) or the like.

Further, the white inorganic material is not limited as long as it is a white inorganic particle. The white inorganic material is preferably at least one selected from titanium dioxide (TiO 2 ), calcium oxide (CaO), and magnesium oxide (MgO). The white inorganic material preferably contains at least titanium dioxide (TiO 2 ). That is, a white inorganic material or consists of a titanium dioxide (TiO 2), preferably the titanium dioxide is a mixture further comprising at least one selected from (TiO 2), calcium (CaO) and magnesium oxide or the like.

On the other hand, the polyolefin film layer 16 contains a white inorganic substance like the first polyester film layer 12. The polyolefin film layer 16 specifically contains a polyolefin-based resin and a white inorganic material. The polyolefin-based resin means a polyethylene-based resin or a polypropylene-based resin. At this time, the polyethylene-based resin is not limited as long as it contains ethylene in the molecule. The polyethylene-based resin may be selected from, for example, a homopolymer of an ethylene monomer or an ethylene-containing copolymer. Examples of the copolymer include ethylene monomers and copolymers such as propylene and butylene monomers. Specific examples of the polyethylene-based resin may include one or more selected from polyethylene (PE), an ethylene-propylene copolymer, an ethylene-butylene copolymer, and the like.

According to the present invention, the first polyester film layer 12 and the polyolefin film layer 16 are formed on both surfaces of the second polyester film layer 14, respectively, to have excellent weather resistance and hydrolysis resistance , And the price is more competitive than the conventional backsheet. Specifically, the second polyester film layer 14 has basic physical properties such as heat resistance and mechanical strength, and the first polyester film layer 12 containing oligomers has weather resistance and mechanical strength in addition to heat resistance and mechanical strength. The property of degradability is given. The polyolefin film layer 16 is remarkably inexpensive because the polyolefin film layer 16 has a weather resistance equal to or higher than that of the conventional fluorine-based film 1b (see FIG. 1) such as PVDF or PVF and the back sheet 10 is supplied at a low price can do.

In addition, the polyolefin film layer 16 has excellent adhesion. That is, the polyolefin film layer 16 not only improves the adhesion between the back sheet 10 and the sealing layer 20, but also achieves excellent interlayer adhesion of the back sheet 10 itself.

Specifically, the sealing layer 20 of the solar cell module is generally composed of an ethylene vinyl acetate (EVA) sheet. When the polyolefin film layer 16 is made of a polyethylene resin, (EVA) sheet, and has excellent adhesion with the encapsulation layer 20 including ethylene. As described above, the first polyester film layer 12 and the second polyester film layer 14 are preferably composed of a polyethylene terephthalate film (PET film) or a polyethylene naphthalate film (PEN film) At this time, the polyolefin film layer 16 includes ethylene as a homogeneous monomer constituting a polyethylene terephthalate film (PET film) or a polyethylene naphthalate film (PEN film), and the second polyester film layer 14 and an excellent interlayer Adhesive strength.

Further, the polyolefin film layer 16 improves the barrier property. That is, the polyethylene-based resin constituting the polyolefin film layer 16 is excellent in gas and liquid impermeability, and improves the durability of the back sheet 10 by improving barrier properties such as moisture barrier properties.

In addition, the first polyester film layer 12 and the polyolefin film layer 16 improve the mechanical properties and optical telephone efficiency (the ratio of converting light into electricity). Specifically, the white inorganic material contained in the first polyester film layer 12 and the polyolefin film layer 16 improves the mechanical properties such as tensile strength and dimensional stability. The white inorganic material reflects incident solar light toward the solar cell C (see FIG. 3) by imparting a reflectivity to the first polyester film layer 12 and the polyolefin film layer 16. Accordingly, the amount of received light (incident light amount) of the solar cell C is increased, and the light conversion efficiency is improved. The white inorganic material preferably includes titanium dioxide (TiO 2 ) as described above. The titanium dioxide (TiO 2 ) is very advantageous in improving the mechanical properties and light conversion efficiency (solar light reflectivity) Do.

The first polyester film layer 12 contains 2-15 parts by weight of a white inorganic material with respect to 100 parts by weight of the polyester-based resin, and the polyolefin film layer 16 is white with respect to 100 parts by weight of the polyolefin- It is preferable that the inorganic material is contained in an amount of 2 to 15 parts by weight. At this time, if the content of the white inorganic material is less than 2 parts by weight, improvement effects such as mechanical properties and light conversion efficiency (solar light reflectivity) depending on its content may be insignificant. If the content of the white inorganic material is more than 15 parts by weight, the content ratio of the polyester-based or polyolefin-based resin may be relatively low, and the adhesive strength may be lowered. In addition, the white inorganic material such as titanium dioxide (TiO 2 ) preferably has a particle size of 30 μm or less. The white inorganic material preferably has a particle size of 0.05 to 30 탆. At this time, if the particle size of the white inorganic material is less than 0.05 탆, the sunlight reflectivity effect may be insignificant. If the particle size exceeds 30 탆, the adhesion of the polyester or polyolefin resin may be deteriorated. The white inorganic material preferably has a particle size of 0.1 to 10 mu m.

In addition, it is preferable that the first polyester film layer 12 and the polyolefin film layer 16 have a thickness of 10 to 250 탆. At this time, if it is less than 10 탆, if it is too thin, the effects such as weather resistance, adhesiveness and mechanical properties may be insignificant. If it is more than 250 탆 and too thick, the flexibility of the back sheet 10 may be deteriorated, which may be undesirable in terms of price.

The first polyester film layer 12 and the polyolefin film layer 16 as described above may be formed on the second polyester film layer 14 in various ways. For example, the first polyester film layer 12 may be formed by molding a composition containing a polyester-based resin, an oligomer and a white inorganic substance into a film, and then thermally fusing it onto the second polyester film layer 14 It can be laminated by an adhesive. Similarly, the polyolefin film layer 16 may be formed by forming a composition containing a polyolefin-based resin and a white inorganic material into a film and then laminating it on the second polyester film layer 14 by thermal fusion or an adhesive. At this time, the adhesive is not particularly limited, and for example, one or more kinds of adhesives selected from an acrylic type, a urethane type and an epoxy type resin can be used. According to a preferred embodiment, the first polyester film layer 12 and the polyolefin film layer 16 are formed through a coating.

Specifically, the polyolefin film layer 16 is formed by coating a coating composition containing a polyethylene-based resin and a white inorganic substance on the second polyester film layer 14, and then forming the film by curing (drying) Do. At this time, the polyolefin film layer 16 has adhesiveness with the second polyester film layer 14 due to adhesiveness of the polyethylene-based resin.

The coating composition may more specifically contain a polyethylene-based resin, a white inorganic substance and a solvent. In this case, the solvent is not limited as long as it can dilute the polyethylene-based resin to have a viscosity to such an extent that coating is possible. As the solvent, for example, at least one organic solvent selected from alcohol-based, glycol-based, ketone-based and formamide-based solvents can be used. For example, the solvent may be at least one selected from methanol, ethanol, isopropanol, methylene glycol, ethylene glycol, methyl ethyl ketone (MEK) and dimethylformamide (DMF). Such a solvent may be contained in an amount of, for example, 50 to 300 parts by weight based on 100 parts by weight of the polyethylene-based resin. If the content of the solvent is less than 50 parts by weight, the viscosity of the coating composition may be lowered, resulting in deterioration in coating performance. If the content of the solvent exceeds 300 parts by weight, the curing (drying) time may be prolonged. In addition, the coating composition may optionally further contain additives such as an antioxidant, a sunscreen agent and a tackifier.

Further, the coating method and the coating number of the coating composition are not limited. For example, spin coating, dip coating, bar coating, spray coating, ink-jet printing, gravure, and screen- printing, and the like, or one or more coatings.

Meanwhile, the solar cell module according to the present invention includes the back sheet 10 of the present invention as described above. 3 is a cross-sectional view illustrating an exemplary embodiment of a solar cell module according to the present invention.

3, the solar cell module according to the present invention includes the transparent member 30, the sealing layer 20, the solar cell C, and the back sheet 100 of the present invention as described above, As shown in FIG.

At this time, the transparent member 30 protects the upper side of the solar cell C, and it is possible to use a tempered glass or the like which is advantageous for the incidence of light with the protection of the solar cell C. 3, the sealing layer 20 may be formed by stacking an upper sealing layer 20b and a lower sealing layer 20a, as shown in FIG. 3, . Such an encapsulating layer 20 may preferably be composed of an ethylene vinyl acetate (EVA) sheet as usual.

In addition, the back sheet 10 is bonded to the bottom of the sealing layer 20. More specifically, the polyolefin film layer 16 of the back sheet 100 is bonded to the lower surface of the lower sealing layer 20a. At this time, the polyolefin film layer 16 and the lower sealing layer 20a can be adhered to each other through heat fusion or an adhesive. The adhesive is not particularly limited, and for example, one or more adhesives selected from acrylic, urethane and epoxy resins can be used. The polyolefin film layer 16 and the lower sealing layer 20a are preferably bonded together by heat fusion.

According to the present invention described above, the back sheet 10 can be reduced in price as described above. That is, in constituting the surface layer for weatherability, the polyolefin film layer 16 and the polyester film layer, which are inexpensive and inexpensive, are used instead of the fluorine-based films such as PVDF and PVF, The back sheet 10 can be supplied at a low cost while maintaining the weather resistance. Further, as described above, not only the adhesion with the sealing layer 20 but also the interlayer adhesion with the polyester film layer is improved, and barrier properties such as moisture barrier properties are improved. In addition, the first polyester film layer 12 and the polyolefin film layer 16 contain a white inorganic material (preferably titanium dioxide) to improve mechanical properties and photoconductivity and the like, (12) contains an oligomer to improve the hydrolysis resistance.

Next, characteristics of a back sheet for a solar cell module according to an embodiment of the present invention will be described. A backsheet for a solar cell module according to an embodiment of the present invention was manufactured and compared with a backsheet according to the prior art. The back sheet for a solar cell module of the present invention was produced through the following experimental example. A back sheet according to the prior art was prepared as a back sheet of W-PO / PET / W-PO structure. Here, W-PO means a polyolefin film to which a white inorganic material is added.

     <Experimental Example: Preparation of Backsheet of Prior Art>

   10 parts by weight of white titanium dioxide (TiO2) having an average particle size of 3 mu m with respect to 100 parts by weight of polyethylene (PE) was mixed to obtain a liquid coating composition. Then,

   A heat-resistant PET film was prepared, and the coated coarse material was bar-coated on both sides thereof,

   Followed by hot air drying. That is, on both sides of a PET film (thickness: 250 mu m), 50 mu m thick

   (Hereinafter referred to as &quot; W-PE film &quot;) was formed on the surface of the W-PE (50

   (50 占 퐉) / PET (250 占 퐉) / W-PE (50 占 퐉).

<Experimental Example: Production of Backsheet of the Present Invention>

10 parts by weight of white titanium dioxide (TiO 2 ) having an average particle size of 3 탆 was mixed with 100 parts by weight of polyester (PET) having an oligomer content of 0.6 wt% based on the weight of the polyester resin, to obtain a first coating composition. Further, a liquid second coating composition was obtained by mixing 10 parts by weight of white titanium dioxide (TiO 2 ) having an average particle size of 3 μm with respect to 100 parts by weight of polyethylene (PE). Next, a heat-resistant PET film having a thickness of 250 占 퐉 was prepared, the first coating composition and the second coating composition were coated on both sides thereof, and then hot-air drying was performed. That is, each of the PET 50㎛ thickness on both surfaces of the film (thickness 250㎛) TiO 2 containing white PET film (hereinafter referred to as "W-PET film 'quot;) and a thickness 50㎛ TiO 2 containing white PE film (hereinafter referred to as" W-PE film &quot;) was formed to prepare a back sheet having a laminated structure of W-PET (50 占 퐉) / PET (250 占 퐉) / W-PE (50 占 퐉).

Ultraviolet rays were tested on the back sheet of the present invention and the conventional W-PO / PET / W-PO back sheet prepared in the above Experimental Example. The ultraviolet test is a test for measuring the tensile strength and elongation of the back sheet under ultraviolet irradiation.

 UV (ultraviolet) weather resistance test

 The backsheet prepared in the above Experimental Example was cut into a size of 10 cm * 10 cm and then irradiated with ultraviolet rays 300 (ultraviolet wavelength 300) at 0, 500, 1000, and 1500 hours under the condition of UV accelerated exposures ~ 400 nm, ultraviolet light quantity: 65 W / m 2), and then the tensile strength and elongation were measured.

  The backsheet was cut to a width of 15 mm and tensile strength and elongation were measured using a tensile strength machine.

Referring to Table 1, the back sheet (W-PET in Table 1) and the conventional back sheet (W-PO) of the present invention show similar tensile strength and elongation characteristics at the beginning of the experiment, The tensile strength and elongation characteristics of the backsheet are lowered, whereas the backsheet of the present invention shows no significant change in tensile strength and elongation properties. In view of the above results, it can be seen that the backsheet according to the present invention maintains the tensile strength and elongation for a long time.

<Tensile strength unit: kgf / mm2, elongation unit:%> division Tensile strength (MD direction) Tensile strength (TD direction) Elapsed time W-PET W-PO W-PET W-PO 0 hours 70.2 68.4 55.0 52.0 500 hours 69.8 55.2 52.9 48.3 1000 hours 59.7 48.7 52.9 46.4 1500 hours 57.0 41.0 52.3 42.2 Elapsed time Elongation (MD direction) Elongation (TD direction) 0 hours 170.6 160.2 85.6 78.2 500 hours 166.2 155.2 71.5 70.4 1000 hours 163.3 150.8 72.0 68.5 1500 hours 158.9 138.5 68.0 55.0

10: back sheet 12: first polyester film layer
14: second polyester film layer 16: polyolefin film layer
20: sealing layer 30: transparent member
C: Solar cell

Claims (8)

A first polyester film layer as a base substrate;
A second polyester film layer laminated on said first polyester film layer; And
And a polyolefin film layer laminated on said second polyester film layer,
Wherein the first polyester film layer contains an oligomer and a white inorganic material, and the polyolefin film layer contains a white inorganic material.
The back sheet for a solar cell module according to claim 1, wherein the first polyester film layer contains 0.5 to 0.8 wt% of oligomers relative to the weight of the polyester-based resin.
The back sheet for a solar cell module according to claim 1, wherein the first polyester film layer contains 2-15 wt% of a white inorganic material based on the weight of the polyester resin.
The back sheet for a solar cell module according to claim 1, wherein the polyolefin film layer contains 2 to 15 wt% of a white inorganic material based on the weight of the polyolefin resin.
The solar cell module according to claim 1, wherein the first polyester film layer and the second polyester film layer comprise at least one selected from polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) Sheet.
The back sheet for a solar cell module according to claim 1, wherein the white inorganic material comprises titanium dioxide (TiO 2 ).
The back sheet for a solar cell module according to claim 1, wherein the white inorganic material has a particle size of 0.1 to 10 mu m.
A solar cell module comprising a back sheet according to any one of claims 1 to 7.
KR1020120143456A 2012-12-11 2012-12-11 Back sheet for solar cell module and solar cell module comprising the same KR101423402B1 (en)

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EP3185311A1 (en) * 2015-12-23 2017-06-28 LG Electronics Inc. Solar cell module
US9882833B2 (en) 2015-09-28 2018-01-30 Centurylink Intellectual Property Llc Intent-based services orchestration
US10389577B2 (en) 2013-08-14 2019-08-20 Centurylink Intellectual Property Llc Ethernet carrier group alarm (CGA)

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JP2011029397A (en) * 2009-07-24 2011-02-10 Fujifilm Corp Back sheet for solar cell, and method of manufacturing the same
JP2012222227A (en) 2011-04-12 2012-11-12 Fujifilm Corp Back sheet for solar cells, laminated body for the solar cells, solar cell module, and manufacturing methods of the back sheet, the laminated body, and the solar cell module

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US10389577B2 (en) 2013-08-14 2019-08-20 Centurylink Intellectual Property Llc Ethernet carrier group alarm (CGA)
US9882833B2 (en) 2015-09-28 2018-01-30 Centurylink Intellectual Property Llc Intent-based services orchestration
EP3185311A1 (en) * 2015-12-23 2017-06-28 LG Electronics Inc. Solar cell module
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