Light high-barrier photovoltaic front backboard

Abstract

The utility model provides a high-barrier photovoltaic front backboard which comprises a high-barrier layer, a supporting layer arranged on the upper side of the high-barrier layer, an anti-aging layer, a supporting layer arranged on the lower side of the high-barrier layer, and an anti-aging layer, the supporting layer on the upper side and the supporting layer on the lower side are oppositely arranged, and the anti-aging layer on the upper side and the anti-aging layer on the lower side are oppositely arranged. The high-barrier layer adopts a PET (Polyethylene Terephthalate) barrier film, the thickness of the high-barrier layer is 8-50 microns, and the water vapor transmission rate (WVTR) of the high-barrier layer is 0.01 g / m < 2 >. D <-1 >-1.0 g / m < 2 >. D <-1 >. The supporting layer adopts a PET layer with the thickness of 50-150 microns, the anti-aging layer adopts a PVDF / ETFE layer with the thickness of 2-20 microns, the high-barrier photovoltaic front backboard provided by the utility model combines multiple layers of polymers with different characteristics, realizes perfect combination of light weight and high barrier performance, and is characterized in that the PET layer and the PVDF layer are arranged on both sides of the barrier film, the structure is symmetrical, and the warping problem caused by asymmetric stress is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic front back plate, especially light high barrier photovoltaic front back plate. BACKGROUND

[0002] The traditional photovoltaic front back plate is made of glass material, which is brittle and easy to burst, and has a large weight and high cost, and is inconvenient to transport. The photovoltaic with glass as the front back plate has a large weight, and can be installed only on a roof or a position with good load-bearing capacity. Therefore, the industry gradually turns to light photovoltaic modules. The front back plate of the packaged photovoltaic cell is replaced by a PET plus PVDF multilayer composite structure. The high-barrier plastic back plate also needs to be compounded with a transparent high-barrier film. The photovoltaic front back plate with a multilayer composite structure has many processes and high cost. In addition, due to the difference in material quality and thickness, the stress deviation is large during compounding, which can easily cause warping, and the subsequent processing of the packaged photovoltaic cell is difficult. Therefore, it is still of great practical significance to develop a light high-barrier photovoltaic front back plate. SUMMARY

[0003] The utility model discloses a light high-barrier photovoltaic front back plate, which has a symmetrical structure to avoid warping caused by asymmetric stress.

[0004] The utility model adopts the technical scheme as follows:

[0005] A light high-barrier photovoltaic front back plate includes a high-barrier layer, a support layer arranged on the upper side of the high-barrier layer, and an anti-aging layer arranged on the lower side of the high-barrier layer. The upper support layer is arranged opposite to the lower support layer, and the upper anti-aging layer is arranged opposite to the lower anti-aging layer. The high-barrier layer is made of a PET barrier film with a thickness of 8-50 um. The support layer is made of a PET layer with a thickness of 50-150 um. The anti-aging layer is made of a PVDF / ETFE layer with a thickness of 2-20 um.

[0006] Further, the PET barrier film includes a PET substrate layer, a barrier plating layer, and a barrier coating layer. The PET substrate layer is connected to the barrier coating layer through the barrier plating layer on both sides.

[0007] Further, the PET substrate layer is made of a polyethylene terephthalate layer.

[0008] Further, the barrier plating layer is selected from one or a combination of any number of aluminum oxide, silicon oxide, and silicon-aluminum mixed oxide.

[0009] Further, the barrier plating layer is selected from one or more of vacuum evaporation plating, vacuum ion plating, and vacuum sputtering plating. The thickness is 10 nm-300 nm.

[0010] Further, the barrier coating layer is made of polyvinyl alcohol (PVA) or polyurethane. 2 .d -1 -1.0g / m 2 .d -1 .

[0011] Further, the support layer is made of polyethylene terephthalate (PET) layer.

[0012] Further, the anti-aging layer is made of polyvinylidene fluoride (PVDF) or ethylene-tetrafluoroethylene copolymer layer.

[0013] The light-weight high-barrier photovoltaic front-back plate has the advantages that the support layer and the anti-aging layer are formed on two surfaces of the transparent high-barrier film, the support layer and the anti-aging layer on the two surfaces are oppositely arranged relative to the high-barrier layer, the high-barrier layer is made of PET barrier film with a thickness of 8-50 um, the support layer is made of PET layer with a thickness of 50-150 um, the anti-aging layer is made of PVDF / ETFE layer with a thickness of 2-20 um, and PET and PVDF layers are simultaneously melt-extruded to be formed at one time, so that the efficiency is high, the structure is symmetrical, and the warping problem caused by asymmetric stress is avoided.

[0014] The light-weight high-barrier photovoltaic front-back plate provided by the utility model has the advantages that the support layer and the anti-aging layer are formed on two surfaces of the transparent high-barrier film, the support layer and the anti-aging layer on the two surfaces are oppositely arranged relative to the high-barrier layer, the high-barrier layer is made of PET barrier film with a thickness of 8-50 um, the support layer is made of PET layer with a thickness of 50-150 um, the anti-aging layer is made of PVDF / ETFE layer with a thickness of 2-20 um, and PET and PVDF layers are simultaneously melt-extruded to be formed at one time, so that the efficiency is high, the structure is symmetrical, and the warping problem caused by asymmetric stress is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with the following specific embodiments, but should not constitute a limitation to the utility model. In the drawings,

[0016] Figure 1 The layer structure diagram of the light-weight high-barrier photovoltaic front-back plate in the utility model embodiment;

[0017] Figure 2 The layer structure diagram of the PET barrier film in the utility model embodiment.

[0018] Names of components and their labels

[0019] High-barrier layer 1, support layer 2, anti-aging layer 3, PET substrate layer 11, barrier plating layer 12, barrier coating layer 13. SPECIFIC EMBODIMENTS

[0020] The specific embodiments of the utility model are described in detail below in combination with the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0021] Please refer to Figure 1As shown, the embodiment of the utility model discloses a light high barrier photovoltaic front backboard, including high barrier layer 1, the support layer 2 of setting in high barrier layer 1 upside, antiaging layer 3, with the support layer 2 of setting in high barrier layer 1 downside, antiaging layer 3, upside support layer 2 and downside support layer 2 are oppositely arranged, upside antiaging layer 3 and downside antiaging layer 3 are oppositely arranged, high barrier layer 1 adopts PET barrier film, and its thickness is at 8~50um, support layer 2 adopts PET layer, and its thickness is at 50~150um, and antiaging layer 3 adopts PVDF or ETFE layer, and its thickness is at 2~20um.

[0022] Further, referring to Figure 2 , the PET barrier film is a material with high barrier property, comprising a PET substrate layer 11, a barrier plating layer 12 and a barrier coating layer 13, the PET substrate layer 11 is connected to the barrier coating layer 13 through the barrier plating layer 12 on both sides. The PET substrate layer 11 adopts a polyethylene terephthalate layer. The barrier plating layer 12 is selected from one or a combination of any of aluminum oxide, silicon oxide and silicon-aluminum mixed oxide. The barrier coating layer 13 is selected from polyvinyl alcohol (PVA) or polyurethane. The water vapor transmission rate (WVTR) of the high barrier layer after processing the barrier plating layer and the barrier coating layer is 0.01 g / m 2 .d -1 -1.0 g / m 2 .d -1 . The barrier plating layer 12 is selected from one or more of vacuum evaporation plating film, vacuum ion plating film and vacuum sputtering plating film; the thickness is 10 nm-300 nm;

[0023] Further, the support layer 2 is selected from PET material, preferably a polyethylene terephthalate layer.

[0024] Further, the antiaging layer 3 is selected from a material with high weather resistance, ultraviolet resistance and chemical corrosion resistance, preferably a polyvinylidene fluoride (PVDF) or ethylene-tetrafluoroethylene copolymer layer.

[0025] The preparation method of the light high barrier photovoltaic front backboard comprises the following steps:

[0026] S1, a barrier plating layer is prepared on both sides of the substrate layer by vacuum plating film technology; the vacuum plating film can be selected from vacuum evaporation plating film and / or vacuum sputtering plating film.

[0027] S2, polyvinyl alcohol (PVA) or polyurethane is coated on the surfaces of the two barrier plating layers to obtain a high barrier layer;

[0028] S3, the polymer raw materials required for the support layer and the antiaging layer are prepared and pretreated, including drying and mixing, etc.

[0029] S4, the pretreated raw materials are respectively sent into the extruder, and by adjusting the temperature and screw speed of the extruder and other parameters, the raw materials of each layer are compounded together with the high barrier layer in the extrusion process;

[0030] S5, the co-extruded multilayer structure is formed through a mold and is cooled and solidified through a cooling device, to obtain a melt co-extrusion lightweight high-barrier photovoltaic front and back panel;

[0031] S6, the formed back panel is subjected to post-processing such as cutting and punching to meet the assembly requirements of the photovoltaic module.

[0032] The lightweight high-barrier photovoltaic front and back panel has the following advantages compared with the prior art:

[0033] (1) lightweight design, the overall weight is reduced, making it more convenient during installation and transportation, reducing installation cost and transportation difficulty.

[0034] (2) excellent high-barrier performance, can effectively block the penetration of water vapor, oxygen and other gases, protect the photovoltaic cell module from the erosion of the external environment, thereby prolonging the service life of the photovoltaic module; high barrier also helps to improve the power generation efficiency of the photovoltaic module and reduce the power loss caused by environmental factors.

[0035] (3) has a wide application prospect, prepared by using advanced melt co-extrusion technology, combined with polymers with different properties, realizing the perfect combination of lightweight and high barrier performance, melt co-extruding PET or PVDF layer on both sides of the barrier film, one-time forming, high efficiency, symmetrical structure, avoiding the warping problem caused by asymmetric stress, having a wide application prospect in building integrated photovoltaic (BIPV) and large ground power station fields, and helping to promote the sustainable development of the photovoltaic industry.

[0036] As long as the spirit of the present application is not violated, various different embodiments of the present application can be combined arbitrarily, and should be regarded as the disclosed content of the present application; within the technical concept of the present application, various simple modifications of the technical scheme and arbitrary combinations of different embodiments without violating the spirit of the present application should be within the protection scope of the present application.

Claims

1. A lightweight, high-barrier photovoltaic front backsheet, characterized by: The high barrier layer, the support layer arranged on the upper side of the high barrier layer, the anti-aging layer, the support layer arranged on the lower side of the high barrier layer, and the anti-aging layer are oppositely arranged, the upper support layer is oppositely arranged with the lower support layer, and the upper anti-aging layer is oppositely arranged with the lower anti-aging layer, the high barrier layer adopts a PET barrier film with a thickness of 8-50 um, the support layer adopts a PET layer with a thickness of 50-150 um, and the anti-aging layer adopts a PVDF / ETFE layer with a thickness of 2-20 um.

2. The lightweight high-barrier photovoltaic front backsheet of claim 1, wherein: The PET barrier film comprises a PET substrate layer, a barrier plating layer and a barrier coating layer, and the PET substrate layer is connected with the barrier coating layer through the barrier plating layer on both sides.

3. The lightweight high-barrier photovoltaic front backsheet of claim 2, wherein: The PET substrate layer adopts a polyethylene terephthalate layer.

4. The lightweight high-barrier photovoltaic front backsheet of claim 2, wherein: The barrier plating layer is selected from one or a combination of any of aluminum oxide, silicon oxide and silicon-aluminum mixed oxide.

5. The lightweight high-barrier photovoltaic front backsheet of claim 4, wherein: The barrier plating layer is selected from one or more of vacuum evaporation plating, vacuum ion plating and vacuum sputtering plating, and the thickness is 10-300 nm.

6. The lightweight high barrier photovoltaic front backsheet of claim 2, wherein: The barrier coating layer is selected from polyvinyl alcohol or polyurethane.

7. The lightweight high barrier photovoltaic front backsheet of claim 1, wherein: The support layer adopts a polyethylene terephthalate layer.

8. The lightweight high barrier photovoltaic front backsheet of claim 1, wherein: The anti-aging layer is selected from a polyvinylidene fluoride layer or an ethylene-tetrafluoroethylene copolymer layer.

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