CN105706251A - Solar cell rear surface protective sheet - Google Patents
Solar cell rear surface protective sheet Download PDFInfo
- Publication number
- CN105706251A CN105706251A CN201480060567.6A CN201480060567A CN105706251A CN 105706251 A CN105706251 A CN 105706251A CN 201480060567 A CN201480060567 A CN 201480060567A CN 105706251 A CN105706251 A CN 105706251A
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- China
- Prior art keywords
- resin
- protective sheet
- resin bed
- sheet used
- backside protective
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
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- 238000012423 maintenance Methods 0.000 description 2
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- WFLOTYSKFUPZQB-UHFFFAOYSA-N 1,2-difluoroethene Chemical group FC=CF WFLOTYSKFUPZQB-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
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- 150000001336 alkenes Chemical class 0.000 description 1
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- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical compound FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 1
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- 150000003077 polyols Chemical class 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 235000014692 zinc oxide Nutrition 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
- B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/285—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyethers
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/12—Photovoltaic modules
-
- 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
Abstract
The present invention provides a solar cell rear surface protective sheet that uses a fluorine resin film in the outermost layer thereof and that minimizes the occurrence of yellowing and cracking in the fluorine resin film. Specifically, the present invention is a solar cell rear surface protective sheet that is arranged on the rear surface side of a solar battery cell and that is characterized in that: (1) the solar cell rear surface protective sheet comprises at least a first resin layer and a second layer that are stacked in this order from the outermost layer, and an innermost layer that is on the opposite side from the outermost layer is attached to a solar battery cell when attaching the solar cell rear surface protective sheet to the solar battery cell; and (2) the first resin layer contains polyvinylidene fluoride, and the crystal structure within the polyvinylidene fluoride as determined from the absorbance observed in the infrared absorption spectrum comprises 30-70% of an [Alpha]-type crystal and a remainder of a [Beta]-type crystal when the total of the [Alpha]-type crystal and the [Beta]-type crystal is 100%.
Description
Technical field
The present invention relates to the backside protective sheet used for solar batteries of a kind of rear side being arranged in solar cell device。
Background technology
Rear side at solar cell device is generally laminated with backside protective sheet used for solar batteries, and they are combined and are commonly referred to solar module。
In recent years, especially from the viewpoint of Global Environmental Problems, it is increased sharply directly converting the solar into the expectation as a new generation's energy of the solaode of electric energy。The purpose using backside protective sheet is in that the protection to the solar cell device back side and insulation。
Solar module is typically provided at outdoor, is exposed exposing to wind and rain, in the rugged environment such as periods of direct sunlight。For solar module, even if also requiring that under this rugged environment it has the Long Service Life more than 25 years, therefore for protecting the backside protective sheet of solar cell device to also require that natural environment is had higher weatherability by it。In order to meet this requirement, the various materials'uses of backside protective sheet are had the material of relatively high durable performance。
The general Rotating fields of backside protective sheet used for solar batteries is shown in Fig. 1。Backside protective sheet 10 is according to the order stacking of the first resin bed 11, bond layer 12a, the second resin bed 13, bond layer 12b and the second resin bed 14。When fitting with solar cell device, solar cell device and the second resin bed 14 are fitted。In other words, the first resin bed 11 is outermost layer, and the second resin bed 14 is innermost layer (below, the layer farthest from solar cell device being called " outermost layer ")。
As outermost first resin bed 11, use the fluorine-type resin thin film (Kynoar, polyvinyl fluoride, ethylene-tetrafluoroethylene copolymer) with weatherability, as the second resin bed 13, it is used to ensure that general polyethylene terephthalate (PET) thin film of thickness (～250 μm) for the purpose of insulating properties, as the second resin bed 14, it is common to use with the encapsulating material of solar cell device and ethylene-vinyl acetate copolymer (EVA) thin layer welding, alkene thin film that fusing point is near 120 DEG C。
As it has been described above, for the back side protecting solar cell device, it is desirable to backside protective sheet used for solar batteries has higher weatherability, even if using, as outermost first resin bed, the fluorine-type resin thin film being also difficult in the presence of a harsh environment deteriorate。Owing to this fluorine-type resin thin film has higher weatherability, even if therefore assuming the second resin bed (such as PET film) deterioration, it is also possible to play the effect of intensity and the shape maintaining backside protective sheet。
As fluorine-type resin thin film, it is common to use polyvinyl fluoride (PVF) resin film, but for viewpoints such as weatherability, soil resistance, thermostabilitys, compared to PVF resin film, the situation using Kynoar (PVDF) resin film is also more。About PVDF resin film, such as, patent documentation 1 proposes following scheme: in order to suppress residual shrinkage, use the thin film containing polyvinylidene fluoride vinyl resin with (methyl) acrylic ester monomer (MMA monomer) with the copolymer resins (MS resin) of styrene monomer (SM monomer)。
Additionally, for rear surface of solar cell screening glass, major requirement weatherability, but the situation being arranged on the open airs such as the roof in house due to solar module is more, and therefore appearance design is also particularly significant。In other words, for backside protective sheet, do not require nothing more than and there is weatherability, also require that it is difficult to produce cosmetic variation (variable color etc.) in life-time service。
Prior art literature
Patent documentation
Patent documentation 1: Japanese Patent Publication 2011-018851 publication
Summary of the invention
(1) to solve the technical problem that
When the outermost layer (the first resin bed) of backside protective sheet used for solar batteries uses fluorine-type resin thin film, there is following two problem。
(1) due to the composition of adjacent bond layer, if it exposes in high temperature environments for a long time, then fluorine-type resin thin film can turn yellow。
(2) due to open air temperature Change sharply, be full of cracks (crackle) can be produced at outermost fluorine-type resin thin film。Specifically, because of the sharply change of high temperature/low temperature, fluorine-type resin thin film will expand/shrink, and thus produce be full of cracks。It is particularly due to solar cell device and there is the metal wiring that thickness is about 0.2mm being referred to as bus, therefore there is the amount of the thickness of bus, small difference in height, if outdoor existence temperature Change sharply, then can produce be full of cracks with this small section difference for starting point。
Thus, it is an object of the invention to provide a kind of backside protective sheet used for solar batteries, it uses fluorine-type resin thin film at outermost layer, and suppresses fluorine-type resin thin film to turn yellow and produce be full of cracks。
(2) technical scheme
The present inventor conducts in-depth research for reaching above-mentioned purpose, and its result is, it has been found that is capable of above-mentioned purpose when outermost layer contains specific Kynoar, so far completes the present invention。
That is, the present invention relates to following backside protective sheet used for solar batteries and solar module。
1. a backside protective sheet used for solar batteries, it is arranged in the rear side of solar cell device, it is characterised in that
(1) described backside protective sheet used for solar batteries is at least laminated with the first resin bed and the second resin bed successively from outermost layer, when fitting with described solar cell device, by the innermost layer of described outermost layer opposition side and the laminating of described solar cell device；
(2) described first resin bed contains Kynoar, the crystalline texture tried to achieve by the absorbance of the infrared absorption spectrum in described Kynoar is, when setting α type crystallization and adding up to 100% with β type crystallization, 30～70% is α type crystallization, and remainder is β type crystallization。
2., in the backside protective sheet used for solar batteries described in technique scheme 1, described first resin bed is relative to the described Kynoar of 100 mass parts, containing the methacrylate of 5～90 mass parts。
3., in the backside protective sheet used for solar batteries described in technique scheme 1 or 2, the thickness of described first resin bed is 10～30 μm。
4., in technique scheme 1 to 3 in backside protective sheet used for solar batteries described in any one, described second resin bed contains at least one in the group selecting free polyethylene, polyolefin resin, (methyl) acrylic resin, polyvinyl chloride resin, polystyrene resins, polyvinylidene chloride resinoid, ethylene-vinyl acetate copolymer saponated material, polyvinyl alcohol, polycarbonate resin, fluorine-type resin, polyvinyl acetate resin, acetal-based resin, polyester resin, polyamide-based resin and polyphenylene oxide resin to form。
5., in technique scheme 1 to 4 in backside protective sheet used for solar batteries described in any one, described second resin bed is by two-layer composition described above。
6. a solar module, it possess solar cell device and be arranged in the technique scheme 1 to 5 of its rear side in backside protective sheet used for solar batteries described in any one。
(3) beneficial effect
Outermost first resin bed of the backside protective sheet used for solar batteries of the present invention contains Kynoar; the crystalline texture tried to achieve by the absorbance of the infrared absorption spectrum in described Kynoar is; when setting α type crystallization and adding up to 100% with β type crystallization; 30～70% is α type crystallization; remainder is β type crystallization, it is possible to the flavescence after suppressing long-time exposure in high temperature environments and the generation of the be full of cracks caused due to variations in temperature sharply。
Accompanying drawing explanation
Fig. 1 is the figure that the Rotating fields of the backside protective sheet used for solar batteries to the present invention illustrates。
Detailed description of the invention
Below, the present invention is described in detail。
Backside protective sheet used for solar batteries
The backside protective sheet used for solar batteries of the present invention is arranged in the back side of solar cell device,
It is characterized in that,
(1) described backside protective sheet used for solar batteries is at least laminated with the first resin bed and the second resin bed successively from outermost layer; when fitting with described solar cell device, by the innermost layer of described outermost layer opposite side and the laminating of described solar cell device；
(2) described first resin bed contains Kynoar (PVDF), the crystalline texture tried to achieve by the absorbance of the infrared absorption spectrum in described PVDF is, when setting α type crystallization and adding up to 100% with β type crystallization, 30～70% is α type crystallization, and remainder is β type crystallization。
The backside protective sheet used for solar batteries of the present invention as characterized above; its outermost first resin bed contains PVDF; the crystalline texture tried to achieve by the absorbance of the infrared absorption spectroscopy in described PVDF is for when setting α type crystallization and adding up to 100% with β type crystallization; 30～70% is α type crystallization; remainder is β type crystallization, it is possible to the flavescence after suppressing long-time exposure in high temperature environments and the generation of the be full of cracks caused due to variations in temperature sharply。
Below, each layer constituting backside protective sheet used for solar batteries is illustrated。
First resin bed (outermost layer)
Containing PVDF in first resin bed, the absorbance of the infrared absorption spectrum in PVDF the crystalline texture tried to achieve is, when setting α type crystallization and adding up to 100% with β type crystallization, 30～70% is α type crystallization, and remainder is β type crystallization。Additionally, the difference of this α type, β type is in that the difference of the crystalline texture (α type crystallization, β type crystallization) tried to achieve by the absorbance of infrared absorption spectrum。Owing to the crystalline texture of PVDF is aforementioned proportion, thereby while outermost layer contains fluorine-type resin, turn yellow after long-time exposure in high temperature environments will be suppressed, and suppress the generation of the be full of cracks caused due to variations in temperature sharply。
In the first resin bed, except α type crystallization, the such crystal type of β type crystallization PVDF except, it is also possible to containing the PVDF of non-crystalline type。First resin bed is either with or without the PVDF of non-crystalline type, as long as the crystalline texture tried to achieve by the absorbance of the infrared absorption spectroscopy in PVDF is, when setting α type crystallization and adding up to 100% with β type crystallization, 30～70% is α type crystallization, and remainder is β type crystallization。Wherein, it is preferable that 40～70% is α type crystallization, and remainder is β type crystallization。If additionally, the ratio of α type crystallization in the PVDF of crystal type and β type crystallization is in above-mentioned scope, even if the PVDF then containing non-crystalline type, without affect resistance to yellowing under hot environment and to producing the suppression chapped。
When except the PVDF of crystal type possibly together with the PVDF of non-crystalline type, when setting crystal type and adding up to 100% with non-crystalline type, crystal type is preferably 20%～60%, it is more preferable to be 30%～50%。
The PVDF of the present invention refer to vinylidene fluoride homopolymer and be main constituent with vinylidene fluoride vinylidene fluoride copolymer。As interpolymerized vinylidene fluoride monomer and the comonomer forming copolymer, for instance there are hexafluoropropene, difluoroethylene, tetrafluoroethene, CTFE, trifluoro-ethylene, hexafluoropropylene (HFP)/tetrafluoroethylene (TFE) bipolymer, CTFE-hexafluoropropene bipolymer etc.。These comonomers can be used alone or use as two or more mixture。Additionally, the copolymerization ratios of the interpolymerized vinylidene fluoride monomer of vinylidene fluoride copolymer is preferably more than the 70 mass % that vinylidene fluoride copolymer is overall, it is more preferable to be more than 80 mass %。
It addition, in order to the characteristics such as the processability of the first resin bed, resistance to impact, cementability, thermostability are improved, other thermoplastic resin can also be contained except PVDF。For example, it is preferable to add the methacrylate of 5～90 mass parts relative to the PVDF of 100 mass parts, it is more preferable to add 5～50 mass parts。Additionally, as methacrylate, for instance can suitably use polymethyl methacrylate (PMMA)。
In the resinous principle of first resin bed of 100 mass %, PVDF is preferably more than 50 mass %, it is more preferable to be about 60～90 mass %。
First resin bed is monolayer, and its thickness is preferably 10～30 μm。When the thickness of the first resin bed is thinner than 10 μm, when manufacturing rear surface of solar cell screening glass, it is easily generated fold。Additionally, when being thicker than 30 μm, when manufacturing solar module, when carrying out bonding operation and vacuum lamination with the encapsulating material (EVA) being layered on element, the shape of peel plate is transferred to the outermost layer of back sheet used for solar batteries, makes degraded appearance。If thickness is 10～30 μm, then can keep the outward appearance after flexibility (adaptability) of operation and vacuum lamination well。
Second resin bed
Require that the second resin bed has weatherability and electrical insulating property。
As the resin constituting the second resin bed, such as can use polyethylene (PE) (such as high density polyethylene (HDPE) (HDPE), Low Density Polyethylene (LDPE), linear low density polyethylene (LLDPE)), polypropylene (PP), the polyolefin resins such as polybutene, (methyl) acrylic resin, polyvinyl chloride resin, polystyrene resins, polyvinylidene chloride resinoid, ethylene-vinyl acetate copolymer saponated material, polyvinyl alcohol, polycarbonate resin, fluorine-type resin (Kynoar, polyvinyl fluoride, ethylene-tetrafluoroethylene copolymer), polyvinyl acetate resin, acetal-based resin, polyester resin (polyethylene terephthalate (PET), polybutylene terephthalate (PBT), PEN), polyamide-based resin, the thin film such as polyphenylene oxide resin or sheet material。These thin film or sheet material can extend along single shaft or two direction of principal axis。
Second resin bed can be monolayer, it is also possible to be made up of two or more multilamellars。In the case of multiple layers, it is possible to give higher electrical insulating property and weatherability to backside protective sheet used for solar batteries, simultaneously, it is also possible to give the relatively high adhesiveness of EVA with the encapsulating material as solar cell device。
Owing to the second resin bed has the effect that backside protective sheet used for solar batteries gives electrical insulating property, higher weatherability and durability, therefore for this viewpoint, it is preferable that use PET in above-mentioned resin。It addition, when the second resin bed is simple layer, for the viewpoint of the relatively high adhesiveness given with EVA, it is preferred to use density 0.900～0.940g/cm3Low Density Polyethylene (LDPE)。
When the second resin bed is multilamellar, it is preferable that be set to pet layer and density 0.900～0.940g/cm successively from outer layers towards inner layers3Low density polyethylene layer (LDPE)。By being formed as described order, make backside protective sheet used for solar batteries have electrical insulating property and higher weatherability/durability, be obtained in that the relatively high adhesiveness of backside protective sheet used for solar batteries and encapsulating material simultaneously。
Whether simple layer or multiple layer, the thickness of the second resin bed is preferably 50～350 μm。Its reason is in that: if the thickness of the second resin bed is less than 50 μm, then cannot obtaining sufficient electrical insulating property, if more than 350 μm, then electrical insulating property is saturated。
Bond layer
Can be that this interlayer when multilamellar possesses bond layer at the interlayer of the first resin bed and the second resin bed and/or at the second resin bed。Such as, as the method forming bond layer, it is possible to employing uses the methods such as the lamination methods of the dry lamination method of bi-component curable polyurethane class binding agent, poly(ether-urethane) class bonding agent, polyesters bonding agent, polyester polyols alcohols bonding agent, polyester polyurethane polyol class bonding agent etc., coetrusion, Extrusion Coating method, use silane coupling agent。
In the present invention, particularly can suitably adopting dry lamination method, this dry lamination method uses at least one polyurethanes bonding agent containing aromatic isocyanate or aliphatic isocyanates。
The additive that each layer is general
To absorb or for the purpose of uv reflectance, it is possible to be mixed into the Chinese white such as titanium oxide, barium sulfate at least one of which of the first resin bed, the second resin bed and bond layer。Furthermore it is also possible to be mixed into the known additives such as the known UV absorbent except coloring pigment, water absorbing agent (desiccant), deoxidizer, antioxidant。Further, it is also possible to containing known heat stabilizer, antioxidant, light stabilizer, UV absorbent, age resister, delustering agent, lubricant, nucleator, mechanical performance improving agent etc.。
Embodiment
Below, it is shown that the present invention is specifically explained by embodiment and comparative example。But, the present invention is not limited to embodiment。
Embodiment 1
It is when setting α type crystallization and amounting to 100% with β type crystallization using the crystalline texture tried to achieve by the absorbance of infrared absorption spectroscopy as the first resin bed, α type crystallization is 70%, β type crystallization is the thickness of 30% is the white PVDF thin film of 12 μm, clear PET film as the thickness 250 μm of the second resin bed (outer layer side), white linear low density polyethylene (LLDPE) thin film as the thickness 50 μm of the second resin bed (internal layer side), use dry lamination bonding agent respectively, carry out bonding with dry lamination method and fit, make white backside protective sheet used for solar batteries。For bonding agent, use so that the coating weight of its solid constituent is 10g/m2The bonding agent prepared of mode。
Embodiment 2
Except using the crystalline texture tried to achieve by the absorbance of infrared absorption spectrum for when setting α type crystallization and adding up to 100% with β type crystallization at the first resin bed; α type crystallization is 60%; β type crystallization is outside the white PVDF thin film of 40%, makes white backside protective sheet used for solar batteries all identically with embodiment 1。
Embodiment 3
Except using the crystalline texture tried to achieve by the absorbance of infrared absorption spectrum for when setting α type crystallization and adding up to 100% with β type crystallization at the first resin bed; α type crystallization is 50%; β type crystallization is outside the white PVDF thin film of 50%, makes white backside protective sheet used for solar batteries all identically with embodiment 1。
Embodiment 4
Except using the crystalline texture tried to achieve by the absorbance of infrared absorption spectrum for when setting α type crystallization and adding up to 100% with β type crystallization at the first resin bed; α type crystallization is 40%; β type crystallization is outside the white PVDF thin film of 60%, makes white backside protective sheet used for solar batteries all identically with embodiment 1。
Embodiment 5
Except using the crystalline texture tried to achieve by the absorbance of infrared absorption spectrum for when setting α type crystallization and adding up to 100% with β type crystallization at the first resin bed; α type crystallization is 30%; β type crystallization is outside the white PVDF thin film of 70%, makes white backside protective sheet used for solar batteries all identically with embodiment 1。
Comparative example 1
Except using the crystalline texture tried to achieve by the absorbance of infrared absorption spectrum for when setting α type crystallization and adding up to 100% with β type crystallization at the first resin bed; α type crystallization is 80%; β type crystallization is outside the white PVDF thin film of 20%, makes white backside protective sheet used for solar batteries all identically with embodiment 1。
Comparative example 2
Except using the crystalline texture tried to achieve by the absorbance of infrared absorption spectrum for when setting α type crystallization and adding up to 100% with β type crystallization at the first resin bed; α type crystallization is 20%; β type crystallization is outside the white PVDF thin film of 80%, makes white backside protective sheet used for solar batteries all identically with embodiment 1。
Comparative example 3
Except using the crystalline texture tried to achieve by the absorbance of infrared absorption spectrum for when setting α type crystallization and adding up to 100% with β type crystallization at the first resin bed; α type crystallization is 2%; β type crystallization is outside the white PVDF thin film of 98%, makes white backside protective sheet used for solar batteries all identically with embodiment 1。
Test example 1 (making of solar module and evaluating characteristics)
By the white backside protective sheet used for solar batteries that will make in embodiment and comparative example; stacking is carried out according to the order of safety glass used for solar batteries (thickness 3.2mm)/EVA (thickness 0.460mm)/bus/crystal silicon element (thickness 0.25～0.30mm)/bus/EVA (thickness 0.460mm)/white backside protective sheet used for solar batteries; and use vacuum laminator (Nano Plasma Ct Co., Ltd.'s system; LM-140X200S) lamination, makes solar module。Additionally, "/" represents the interlayer of each layer。
For each solar module, measure its yellowing degree after PCT test (temperature is 120 DEG C, and humidity is 100%, and air pressure is 2atm × 96 hour), and to there being flawless to produce to investigate after TC tests。Additionally, PCT refers to pressure cooker testing, TC refers to thermal cycling test。
(test method 1) measures yellowing degree (△ b value)
In the mensuration of yellowing degree; the outermost layer (resin bed 11) of the backside protective sheet used for solar batteries before and after above-mentioned PCT test is measured by the Color whiteness meter (ProductName: NW11) manufactured by electricity Se Industrial Co., Ltd of Japan, the difference △ b value of the yellow before and after test is represented。
The b value of the sample before test is set to b1, when the b value of the sample after test is set to b2, the difference of b1 and b2 is set to △ b=b2-b1。
Metewand is as described below。
△ b < 3.0 ... qualified (A): discoloration is very little
3.0≤△ b≤3.5 ... qualified (B): slightly variable color, but there is no actually used on problem
3.5 < △ b ... defective (C): yellowing degree is relatively big, brown degree increases in appearance。
The be full of cracks that (test method 2) checking causes because of variations in temperature sharply with or without generation
Use thermal cycling test (TC test) as the checking of the be full of cracks caused because of variations in temperature sharply with or without generation。In thermal cycling test, use the Espec ARS-0680-J manufactured。Experimental condition is with IEC6121510.11 for foundation。
Thermal cycle is set as 25 DEG C →-40 DEG C (41min) ,-40 DEG C of maintenances (30min) ,-40 DEG C → 85 DEG C (75min), 85 DEG C of maintenances (30min), 85 DEG C → 25 DEG C (30min)。
It addition, when said temperature is be more than or equal to 25 DEG C, the electric current of the maximum output services electric current (Ipm) as module is applied to solar module, tests。
The maximum output services electric current (Ipm) applied to solar module is by using solar simulator (the rugged electric system of rock, PXSS4K-1P) to be measured obtaining measured value to generating output characteristics before TC tests。
Solar module in using continuous-current plant (Kikusui system, PAS20-18) to test to TC applies electric current。
Validation test terminates rear rear surface of solar cell screening glass flawless。
Flawless is had after confirming test。Flawless is set to A, has crackle to be set to B。
When confirming crackle, carry out being visually confirmed to be and use magnifier to confirm。Magnifier employ East Sea Industry Co., Ltd manufacture must good magnifier (ピ Network Le ペ, Peakloupe) 10X, its effective diameter is
In Table 1 result above is indicated。
(table 1)
As shown in table 1; containing when setting α type crystallization and adding up to 100% with β type crystallization in first resin bed, α type crystallization is 30～70%, and remainder is the backside protective sheet used for solar batteries of the PVDF of β type crystallization; its yellowing degree (△ b value) is less than 3.5, and will not crack。
As comparative example 2,3, the ratio of the α type crystallization in PVDF is less than 30%, yellowing degree (△ b value) will more than 3.5, when yellowing degree (△ b value) is more than 3.5, visually just know that brown degree increases, thus appearance design becomes excessively poor。If it addition, the ratio of the α type crystallization in PVDF is more than 70%, then variations in temperature sharply cannot be born, thus cracking。
Description of reference numerals
10 back-protective thin film used for solar batteries
11 first resin beds (outermost layer)
12a bond layer
12b bond layer
13 second resin beds (outer layer side)
14 second resin beds (innermost layer of the form of internal layer side: Fig. 1)
Claims (6)
1. a backside protective sheet used for solar batteries, it is arranged in the rear side of solar cell device, it is characterised in that
(1) described backside protective sheet used for solar batteries is at least laminated with the first resin bed and the second resin bed successively from outermost layer, when fitting with described solar cell device, by the innermost layer of described outermost layer opposition side and the laminating of described solar cell device；
(2) described first resin bed contains Kynoar, the crystalline texture tried to achieve by the absorbance of the infrared absorption spectrum in described Kynoar is, when setting α type crystallization and adding up to 100% with β type crystallization, 30～70% is α type crystallization, and remainder is β type crystallization。
2. backside protective sheet used for solar batteries according to claim 1, it is characterised in that described first resin bed is relative to the described Kynoar of 100 mass parts, containing the methacrylate of 5～90 mass parts。
3. backside protective sheet used for solar batteries according to claim 1 and 2, it is characterised in that the thickness of described first resin bed is 10～30 μm。
4. backside protective sheet used for solar batteries as claimed in any of claims 1 to 3; it is characterized in that, described second resin bed contains at least one in the group selecting free polyethylene, polyolefin resin, (methyl) acrylic resin, polyvinyl chloride resin, polystyrene resins, polyvinylidene chloride resinoid, ethylene-vinyl acetate copolymer saponated material, polyvinyl alcohol, polycarbonate resin, fluorine-type resin, polyvinyl acetate resin, acetal-based resin, polyester resin, polyamide-based resin and polyphenylene oxide resin to form。
5. backside protective sheet used for solar batteries as claimed in any of claims 1 to 4, it is characterised in that described second resin bed is by two-layer composition described above。
6. a solar module, it possess solar cell device and be arranged in the claim 1 to 5 of its rear side in backside protective sheet used for solar batteries described in any one。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2013-233341 | 2013-11-11 | ||
| JP2013233341 | 2013-11-11 | ||
| PCT/JP2014/079849 WO2015068849A1 (en) | 2013-11-11 | 2014-11-11 | Solar cell rear surface protective sheet |
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| CN105706251A true CN105706251A (en) | 2016-06-22 |
| CN105706251B CN105706251B (en) | 2018-09-25 |
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| CN201480060567.6A Active CN105706251B (en) | 2013-11-11 | 2014-11-11 | Backside protective sheet used for solar batteries |
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| JP (1) | JPWO2015068849A1 (en) |
| CN (1) | CN105706251B (en) |
| TW (1) | TWI655787B (en) |
| WO (1) | WO2015068849A1 (en) |
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| CN107093646A (en) * | 2017-06-19 | 2017-08-25 | 江苏润达光伏无锡有限公司 | A kind of photovoltaic crystal silicon component and preparation method thereof |
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Also Published As
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| WO2015068849A1 (en) | 2015-05-14 |
| JPWO2015068849A1 (en) | 2017-03-09 |
| TW201535763A (en) | 2015-09-16 |
| TWI655787B (en) | 2019-04-01 |
| CN105706251B (en) | 2018-09-25 |
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