CN102956730A - Solar cell back sheet, preparation method thereof and solar cell - Google Patents
Solar cell back sheet, preparation method thereof and solar cell Download PDFInfo
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- CN102956730A CN102956730A CN2011102507318A CN201110250731A CN102956730A CN 102956730 A CN102956730 A CN 102956730A CN 2011102507318 A CN2011102507318 A CN 2011102507318A CN 201110250731 A CN201110250731 A CN 201110250731A CN 102956730 A CN102956730 A CN 102956730A
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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a solar cell back sheet. The back sheet comprises a metal aluminum alloy plate layer, an organic insulated layer and an anti-corrosion layer, wherein the organic insulated layer is arranged on one face of the metal aluminum alloy plate layer by virtue of electrostatic spraying, and the anti-corrosion layer is arranged on the other face of the metal aluminum alloy plate layer; and the metal aluminum alloy plate layer contains at least one of polyvinyl fluoride resin, polyvinylidene fluoride resin, polytrifluoroethylene resin, polytetrafluoroethylene resin or copolymers of monomers of the polyvinyl fluoride resin, the polyvinylidene fluoride resin, the polytrifluoroethylene resin and monomers of the other resins. The invention further provides a preparation method of the back sheet and a solar cell containing the back sheet. A well binding force exists between the organic insulated layer and the metal aluminum alloy plate layer of the back sheet provided by the invention.
Description
Technical field
The invention belongs to technical field of solar batteries, relate in particular to a kind of solar cell backboard and preparation method thereof and a kind of solar cell.
Background technology
Solar cell is directly light energy conversion to be become to the device of electric energy by photoelectric effect.It is a kind of novel power supply of following main development, has permanent, spatter property and the large advantage of flexibility three, and its market prospects are wide.Solar energy power generating can occupy the important seat of world energy sources consumption in the near future, not only wants the Substitute For Partial conventional energy resource, and will become the main body of world energy supplies.
Solar panel is a laminated construction normally, mainly comprises that transparent cover plate, sealant layer, solar battery sheet, sealant layer and solar cell backboard lamination form.Wherein, the Main Function of solar cell backboard is the overall mechanical strength that improves solar panel, can prevent that in addition water vapor permeable from, in sealant, affecting the useful life of cell piece.Characteristics such as so solar cell backboard must have insulation (anti-electrical breakdown), ageing-resistant, weather affects and corrosion-resistant.
At present, existing solar cell backboard is produced by the molded mode of stratified film.Take the most frequently used TPT as example, and it is that independently film is hot-forming by the bonding of glue with three layers of polyvinyl fluoride/PETG/polyvinyl fluorides (being PVF/PET/PVF).
Applicant of the present invention discloses a kind of solar cell backboard in Chinese patent CN102082185A, it comprises sheet-metal layers and the electrophoretic coating organic insulator on the sheet-metal layers two sides, and described organic insulator is one or more in phenolic resins, epoxy resin, amino resins.
But TPT has the following disadvantages: 1, poor radiation, the TPT outer surface is pure white, better to sun reflection of light, the source of having reduced heat, but the non-constant of the heat conductivility of macromolecule resin, the heat that solar battery sheet can't be distributed is effectively derived; 2, flexible material needs to use larger aluminium frame to guarantee its mechanical load test in passing through IEC61215 in solar module production.And the organic insulator of the disclosed solar cell backboard of above-mentioned patent is coated on sheet-metal layers with electrophoresis, the adhesion between organic insulator and sheet-metal layers is bad.
Summary of the invention
The present invention is for the heat dispersion that solves solar cell backboard of the prior art is poor and the poor technical problem of adhesion, the solar cell that solar cell backboard that a kind of price good in thermal property and adhesion are good and preparation method thereof is provided and contains this backboard.
The invention provides a kind of solar cell backboard, described backboard comprises metallic aluminium alloy plate layer and the organic insulator of metallic aluminium alloy plate layer one side electrostatic spraying and the anticorrosion layer of another side; Described organic insulator contains polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, at least one in the copolymer of the monomer of polyflon or polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, polyflon and the monomer of other resins.
The present invention also provides the preparation method of above-mentioned solar cell backboard, the method comprises carries out passivation or microetch processing to the metallic aluminium alloy plate layer, then in the one side of metallic aluminium alloy plate layer, the method by electrostatic spraying forms organic insulator, at another side, forms anticorrosion layer; Described organic insulator contains polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, at least one in the copolymer of the monomer of polyflon or polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, polyflon and the monomer of other resins.
The present invention also provides a kind of solar cell, and it comprises transparency cover flaggy, sealant layer, solar cell lamella, sealant layer and the solar cell backboard layer that stacks gradually hot pressing; Described solar cell backboard is solar cell backboard of the present invention.
Solar cell backboard of the present invention be take the metallic aluminium alloy sheets as base material, in the front of metallic aluminium alloy plate layer (with the EVA contact-making surface), adopt the method for electrostatic spraying to form in its surface organic insulator, adhesion between this organic insulator and metallic aluminium alloy sheets is good, before carrying out electrostatic spraying, the metallic aluminium alloy plate layer is carried out to passivation or microetch processing simultaneously, passivation or microetch are processed the surface that can increase the metallic aluminium alloy plate layer and are reached and roughness, further increase the adhesion between organic insulator and metallic aluminium alloy plate layer.
Embodiment
The invention provides a kind of solar cell backboard, described backboard comprises metallic aluminium alloy plate layer and the organic insulator of metallic aluminium alloy plate layer one side electrostatic spraying and the anticorrosion layer of another side; Before electrostatic spraying, the metallic aluminium alloy plate layer is carried out to passivation or microetch processing; Described organic insulator contains polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, at least one in the copolymer of the monomer of polyflon or polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, polyflon and the monomer of other resins.
The present invention adopts the metallic aluminium alloy plate layer as basic unit, makes backboard have higher mechanical strength, thereby, can reduce greatly the thickness of aluminium frame, thereby reduce the use amount of aluminium.Aluminium is as metal, and good heat-transfer, have thermal diffusivity preferably.Aluminium is very light of quality in metal, thereby infrared ray is had to less absorption.
Described organic insulator contains polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, at least one in the copolymer of the monomer of polyflon or polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, polyflon and the monomer of other resins.The sealant layer of this organic insulator and solar energy has good adhesion, can completely cut off again contacting of air and backboard simultaneously, plays the effect that stops burning, can also strengthen that cell piece combines and backboard between insulation property.Described other resins have no particular limits, so long as can and the monomer copolymerization of above-mentioned resin get final product, as the monomer acrylic acid of polyacrylic resin etc.
Described organic insulator can be single coating, can be also composite coating, is divided into prime coat and top coat layer.Priming paint is for increasing the adhesion of organic insulator and metallic aluminium alloy plate layer.The color of organic insulator has no particular limits, but, for better reflected sunlight radiation, reduces the temperature of backboard, and preferably, the color of organic insulator is white.No matter be single coating or composite coating, the thickness of organic insulator is at 10-120 μ m, take 30-60 μ m as best.
Described organic insulator coating used can also can be purchased in own configuration, and the present invention adopts the coating be purchased, and as the fluorocarbon coating of PPG company, model is DURANAR
?the fluorocarbon resin of XL WHITE or AKZO NOBEL company, model is Interpon
?powder coatings D3000 fm.
According to solar cell backboard provided by the present invention, preferably, described anticorrosion layer is anodic oxide coating, dope layer or differential arc oxidation layer.Described dope layer can be the coating identical with organic insulator, can be also other coatings, as long as can meet corrosion resistance.If mainly consider that the residing environment of organic insulator and dope layer is different, can preferably adopt different materials.Dope layer is exposed in air, adopts preferably resin of water-resisting property, weatherability.Organic insulator adopt insulation property good and with sealant layer adhesion resin preferably; If consider main easy to operate and time saving words, preferably adopt the coating that dope layer is identical with organic insulator.
According to solar cell backboard provided by the present invention, preferably, the thickness of anodic oxide coating is 10-40 μ m, 20-25 μ m more preferably, and anodised color be take true qualities as best.The thickness of differential arc oxidation is 10-70 μ m, 20-25 μ m more preferably, and the color of differential arc oxidation be take white as best.
The solar cell backboard provided according to this, preferably, the thickness of described metallic aluminium alloy plate layer is 0.1-0.7mm, more preferably 0.15-0.3mm.The aluminium alloy that is respectively that the material of aluminium alloy plate is 1 fine aluminium that is and 2-9 system.Wherein, with 5, be to be best with 6.
The solar cell backboard provided according to this, preferably, the thickness of described backboard is 0.15-0.9mm, more preferably 0.2-0.4mm.
The solar cell backboard provided according to this, preferably, also contain functional filler in described organic insulator, described functional filler is at least one in rutile type titanium white, zinc oxide, zinc sulphide, antimony oxide, aluminium oxide, carclazyte, aluminium oxide, barium sulfate, barite, calcium carbonate, magnesium silicate, silicon dioxide, diatomite, ultramarine, styrax and glass microballoon.Described functional filler can increase sun reflection of light, the best that is reflected into rutile type titanium white and glass microballoon to sunlight.
In solar cell backboard of the present invention, the adhesion of organic insulator and metallic aluminium alloy plate layer is good, the instant use for a long time, also difficult drop-off.Secondly, organic insulator of the present invention is even, smooth, smooth, and compactness is good; Compactness can effectively prevent penetrating of steam well, and smooth surface, compactness cause well the corrosion resistance of organic insulator strong.Again, the hardness of organic insulator of the present invention is high, good impact resistance, can improve the resistance that organic insulator suffers the unexpected injuries such as scuffing, thereby can effectively protect the metallic aluminium alloy plate layer, improves the useful life of solar cell backboard.
The present invention also provides a kind of preparation method of solar cell backboard, and the method is included in the one side of metallic aluminium alloy plate layer by the method formation organic insulator of electrostatic spraying, at another side, forms anticorrosion layer; Before described electrostatic spraying, the aluminium alloy flaggy is carried out to passivation or microetch processing; Described organic insulator contains polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, at least one in the copolymer of the monomer of polyflon or polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, polyflon and the monomer of other resins.
According to preparation method provided by the present invention, preferably, the electrostatic spraying that described electrostatic spraying is powdery paints or the electrostatic spraying of solvent based coating.After using the method for electrostatic spraying, the adhesive force of coating is high, and the powder simultaneously be not attached on aluminium alloy plate can reclaim, and raw material do not have waste substantially, can well save cost.Before carrying out electrostatic spraying, the metallic aluminium alloy plate layer is carried out to passivation or microetch processing, passivation or microetch are processed the surface that can increase the metallic aluminium alloy plate layer and are reached and roughness, further increase the adhesion between organic insulator and metallic aluminium alloy plate layer simultaneously.
The electrostatic spraying of described powdery paints, the voltage general control of spraying is 40-100KV, and supplying the air pressure of powder is 0.2-0.8MPa, and sintering temperature is 160-260 ℃, and sintering time is 10-30min.
The electrostatic spraying of described solvent based coating, the voltage general control of spraying is 20-120KV, and air pressure is 0.2-0.8MPa, and bake out temperature is 100-180 ℃, and drying time is 10-60min.
According to preparation method provided by the present invention, preferably, described formation anticorrosion layer anodic oxide coating, dope layer or differential arc oxidation layer.
The method of described formation anodic oxide coating is after the one side of aluminum alloy plate materials forms organic insulator, carry out anodic oxidation at its another side, described anodic oxidation can be used the anode oxidation method of any routine for aluminum alloy surface, for example, can in the sulfuric acid of 50-500 grams per liter, carry out, be preferably the 100-300 grams per liter, can pacify for 0.5-5/square centimeter of current density, be preferably 1-3 peace/square centimeter, oxidization time can be 10-60 minute, is preferably 15-40 minute.
Described formation differential arc oxidation layer method is after the one side of aluminum alloy plate materials forms organic insulator, carry out differential arc oxidation at its another side, described differential arc oxidation can be used the differential arc oxidation method of any routine for aluminum alloy surface, for example, at sodium phosphate 10g/L-20g/L, sodium metasilicate 5g/L-l0g/L, potassium hydroxide 1 g/L-4 g/L, sodium molybdate l0g/L-15g/L, the pH value scope of electrolytic solution is 8-12.Magnitude of voltage is 550V-650V, and the time is 30-60min.Pending aluminium alloy is placed in to electrolytic solution, and the stainless steel tube in the middle of being placed in solution is as negative electrode, and aluminium alloy is as anode, the power acquisition direct current pulse power source.Generate one deck and take the aluminium oxide ceramics layer that aluminium oxide is Main Ingredients and Appearance on aluminium alloy castings.
According to preparation method provided by the present invention, preferably, before forming organic insulator and anticorrosion layer, the metallic aluminium alloy sheets is carried out to passivation or microetch processing.Passivation or microetch are processed surface area and the roughness that can increase aluminium alloy plate.
Described passivating method is this area method commonly used.Simply be described below two kinds of passivating methods at this:
Passivating method one: can by aluminium alloy with passivating solution soaked, spray or wiping.Time is 1-10 minute, and temperature is 15-40 ℃.Passivating solution is: acrylic resin 1-50 part, silica gel 2-100 part, NaS 5-30 part, NaH
2pO
43-100 part, HF 0.5-90 part, HNO
3the water of 1-95 part and 1000 parts.
Passivating method two: at first aluminium alloy plate is contained to washing in the decontamination pond of deoiling of cleanser, temperature 30-60 ℃, the time is 10-20min.Be washed to neutrality, soaking at room temperature 2-3min in the salpeter solution of 5-8%.Be washed to neutrality, in the passivation enveloping agent solution, soak 50-60min, temperature is 40-60 ℃, and the concentration of passivation complexing agent is 5-8%, and total alkalinity is 15-25.Be washed to neutrality, dry getting final product.
The method of described microetch is: at first aluminium alloy plate contains washing in the decontamination pond of deoiling of cleanser, temperature 30-60 ℃, and the time is 10-20min.After wipe oil, in concentration, be soaking at room temperature 5-20min in 8-12%NaOH solution.Be washed to neutrality, soaking at room temperature 2-7min in the HCl solution that is 5% in concentration.Be washed to neutrality, dry getting final product.
The present invention also provides a kind of solar cell, and it comprises transparency cover flaggy, sealant layer, solar cell lamella, sealant layer and the solar cell backboard layer that stacks gradually hot pressing; Described solar cell backboard is solar cell backboard of the present invention.
Wherein, transparent cover plate is that ability and technical staff are known, is generally glass.
Sealant layer is also that the ability technical staff is known, is generally ethylene-vinyl acetate copolymer (EVA).Other are known in those skilled in the art, and therefore not to repeat here.
Solar cell backboard of the present invention, can be adjusted the thickness of coating according to the situation of different coating, lower than 0.25mm.Although aluminum alloy plate materials is thick, it is the optimum conductor of heat.Rigid material, less aluminium frame gets final product, and save aluminium alloy, and its price is lower.
Following Application Example is further elaborated to the present invention.
Embodiment 1
The aluminium alloy plate that is 0.3mm by thickness (model: 5052) carry out the passivation preliminary treatment, then its two sides is finally dried to 60min by it at 160 ℃ with the electrostatic spraying composite coating of solvent based coating, obtain solar cell backboard A1.The thickness of priming paint is 7.5 μ m, and the thickness of finish paint is 27.5 μ m.The fluorocarbon coating that priming paint and finish paint are PPG company, model is DURANAR XL WHITE.
Embodiment 2
The aluminium alloy plate that is 0.15mm by thickness (model: 1060) carry out the passivation preliminary treatment, then by its two sides by the electrostatic spraying single coating of powdery paints finally by it at 240 ℃ of sintering 25min, obtain solar cell backboard A2.Coating layer thickness is 25 μ m.The fluorocarbon resin of AKZO NOBEL company, model is Interpon powder coatings D3000 fm.
Embodiment 3
The aluminium alloy plate that is 0.7mm by thickness (model: 6061) carry out the passivation preliminary treatment, then will, wherein simultaneously with the electrostatic spraying composite coating of solvent based coating, dry 60min for 160 ℃.Finally place it in anodizing solution another side is carried out to anodic oxidation, obtain solar cell backboard A3.The thickness of anodic oxide coating is 20 μ m.The thickness of priming paint is 5 μ m, and the thickness of finish paint is 25 μ m.The fluorocarbon coating that priming paint and finish paint are PPG company, model is DURANAR XL WHITE.
Embodiment 4
The aluminium alloy plate that is 0.3mm by thickness (model: 6063) carry out the microetch preliminary treatment, the electrostatic spraying single coating of powdery paints for one side therein, then by it at 220 ℃ of sintering 30min.Finally place it in anodizing solution another side is carried out to anodic oxidation, obtain solar cell backboard A4, the thickness of anodic oxide coating is 10 μ m.Coating layer thickness is 60 μ m.The fluorocarbon resin of AKZO NOBEL company, model is Interpon powder coatings D3000 fm.
Embodiment 5
The aluminium alloy plate that is 0.3mm by thickness (model: 6061) carry out the microetch preliminary treatment, the electrostatic spraying single coating of powdery paints for one side therein, then by it at 220 ℃ of sintering 30min.Finally place it in anodizing solution another side is carried out to anodic oxidation, obtain solar cell backboard A5.The thickness of anodic oxide coating is 40 μ m.Coating layer thickness is 10 μ m.The fluorocarbon resin of AKZO NOBEL company, model is Interpon powder coatings D3000 fm.
Embodiment 6
The aluminium alloy plate that is 0.3mm by thickness (model: 6063) carry out the passivation preliminary treatment, the electrostatic spraying single coating of powdery paints for one side therein, then by it at 220 ℃ of sintering 30min.Finally place it in differential arc oxidation liquid another side is carried out to differential arc oxidation, obtain solar cell backboard A6.The thickness of differential arc oxidation layer is 40 μ m.Coating layer thickness is 120 μ m.The fluorocarbon resin of AKZO NOBEL company, model is Interpon powder coatings D3000 fm.
Embodiment 7
The aluminium alloy plate that is 0.7mm by thickness (model: 1060) carry out the passivation preliminary treatment, then by its two sides by the electrostatic spraying single coating of powdery paints finally by it at 200 ℃ of sintering 30min, obtain solar cell backboard A7.Coating layer thickness is 100 μ m.The fluorocarbon resin of AKZO NOBEL company, model is Interpon powder coatings D3000 fm.
Comparative Examples 1
The TPT solar cell backboard CA1 bought, upper strata PVF bed thickness 25 μ m, middle PE T bed thickness 0.3mm, the PVF of lower floor bed thickness 25 μ m.
Comparative Examples 2
Get the aluminium alloy plate of 0.7mm, the polyurethane modified epoxy resin layer of electrophoretic coating 40 μ m on the aluminium alloy plate one side.The melamine resin layer of electrophoretic coating 30 μ m on another side.Make solar cell backboard, be denoted as CA2.
Method of testing and result
1, insulating properties
Tested according to the UL1703 method of testing, can be tolerated the high pressure of 3000V, and not breakdown be considered as qualified.The results are shown in Table 1.
2, solar module conversion ratio
Each cell piece quantity 60(6*10) sheet, choose the cell piece (15.5-16.0%) of same transitions efficiency as far as possible, assembly B1-B7 and CB1 that to prepare area be 1640*992mm.The test of assembly transformation efficiency is with reference to IEC61215.The results are shown in Table 1.
3, thermal diffusivity test
First the solar cell of the different backboard materials of embodiment 1-7 and Comparative Examples 1 is made to the battery modules of 1640*992mm specification, to under outdoor daylight, irradiate 1 hour, with infrared radiation thermometer, 5, battery is measured to temperature, average, the temperature of contrast unlike material backboard battery.Testing time is 12:50:02-13:50:02 at noon on May 9th, 2011, and place is Shenzhen, the results are shown in Table 1.
4, the reflectivity of organic insulator
The test of the reflectivity of insulating coating is with reference to JGT 235-2008.The results are shown in Table 1.
5, peel strength
Tested according to ASTM D 1876-08, be the results are shown in Table 1.
Table 1
As can be seen from Table 1, the insulating properties of backboard of the present invention meets the requirements fully; And the assembly with the conversion ratio of the assembly of backboard of the present invention higher than the backboard by Comparative Examples 1 and Comparative Examples 2; As can also be seen from Table 1, after the thermal diffusivity test, the temperature of embodiment 1-7 is starkly lower than Comparative Examples 1 and Comparative Examples 2, this illustrates that solar cell backboard provided by the present invention can effectively go out dissipation of heat, thereby the temperature that makes solar cell remains on low state, make the efficiency of solar cell improve and reduce the high temperature infringement of parts, extend parts useful life.Backboard of the present invention has high reflectivity, and higher reflectivity can effectively reflect away the solar radiation energy, and by aluminium alloy plate, is not absorbed, and improves efficiency and the life-span of solar cell.The peel strength of backboard of the present invention is higher than 36 N/cm, and the peel strength of Comparative Examples 1 is 30 N/cm, and Comparative Examples 2 is 20 N/cm, and the adhesion of backboard of the present invention is significantly better than Comparative Examples.
Claims (14)
1. a solar cell backboard, is characterized in that, described backboard comprises metallic aluminium alloy plate layer and the organic insulator of metallic aluminium alloy plate layer one side electrostatic spraying and the anticorrosion layer of another side; Described organic insulator contains polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, at least one in the copolymer of the monomer of polyflon or polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, polyflon and the monomer of other resins.
2. solar cell backboard according to claim 1, is characterized in that, described organic insulator position composite bed, and this composite bed comprises prime coat and top coat layer.
3. solar cell backboard according to claim 1, is characterized in that, described anticorrosion layer is anodic oxide coating, dope layer or differential arc oxidation layer.
4. solar cell backboard according to claim 3, is characterized in that, the thickness of described dope layer is 10-120 μ m; The thickness of described anodic oxide coating is 10-40 μ m; The thickness of described differential arc oxidation is 10-70 μ m.
5. solar cell backboard according to claim 1, is characterized in that, the thickness of described organic insulator is 10-120 μ m.
6. solar cell backboard according to claim 1, is characterized in that, the thickness of described metallic aluminium alloy plate layer is 0.1-0.7mm.
7. solar cell backboard according to claim 1, is characterized in that, the thickness of described backboard is 0.15-0.9mm.
8. solar cell backboard according to claim 1, it is characterized in that, also contain functional filler in described organic insulator, described functional filler is at least one in rutile type titanium white, zinc oxide, zinc sulphide, antimony oxide, aluminium oxide, carclazyte, aluminium oxide, barium sulfate, barite, calcium carbonate, magnesium silicate, silicon dioxide, diatomite, ultramarine, styrax and glass microballoon.
9. the preparation method of a solar cell backboard, it is characterized in that, the method comprises that the metallic aluminium alloy plate layer is carried out to passivation or microetch to be processed, and then in the one side of metallic aluminium alloy plate layer, the method by electrostatic spraying forms organic insulator, at another side formation anticorrosion layer; Described organic insulator contains polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, at least one in the copolymer of the monomer of polyflon or polyfluoroethylene resin, polyvinylidene fluoride resin, poly-trifluoro-ethylene resin, polyflon and the monomer of other resins.
10. preparation method according to claim 9, is characterized in that, the electrostatic spraying that described electrostatic spraying is powdery paints or the electrostatic spraying of solvent based coating.
11. preparation method according to claim 9, is characterized in that, described passivation passivating solution is: acrylic resin 1-50 part, silica gel 2-100 part, NaS 5-30 part, NaH
2pO
43-100 part, HF 0.5-90 part, HNO
3the water of 1-95 part and 1000 parts; Passivation time is 1-10 minute, and passivation temperature is 15-40 ℃.
12. preparation method according to claim 9, is characterized in that, described passivation comprises the passivation complexing agent with passivating solution, and the concentration of described passivation complexing agent is 5-8%, and total alkalinity is 15-25; Passivation time is 50-60min, and passivation temperature is 40-60 ℃.
13. preparation method according to claim 9, is characterized in that, the method for described microetch is soaking at room temperature 2-7min in 5% HCl solution.
14. a solar cell, it comprises transparency cover flaggy, sealant layer, solar cell lamella, sealant layer and the solar cell backboard layer that stacks gradually hot pressing; It is characterized in that, described solar cell backboard is the described solar cell backboard of claim 1-8 any one.
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