CN112563360A - Backboard for photovoltaic module, preparation method of backboard and photovoltaic module - Google Patents

Backboard for photovoltaic module, preparation method of backboard and photovoltaic module Download PDF

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Publication number
CN112563360A
CN112563360A CN202011384906.XA CN202011384906A CN112563360A CN 112563360 A CN112563360 A CN 112563360A CN 202011384906 A CN202011384906 A CN 202011384906A CN 112563360 A CN112563360 A CN 112563360A
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China
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layer
photovoltaic module
base material
adhesive
metal base
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CN202011384906.XA
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Chinese (zh)
Inventor
谭小春
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Longi Solar Technology Co Ltd
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Xian Longi Green Energy Architecture Technology Co Ltd
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Priority to CN202011384906.XA priority Critical patent/CN112563360A/en
Publication of CN112563360A publication Critical patent/CN112563360A/en
Priority to PCT/CN2021/133233 priority patent/WO2022116893A1/en
Pending legal-status Critical Current

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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
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/085—Layered products comprising a layer of metal comprising metal 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 comprising polyolefins
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/088—Layered products comprising a layer of metal comprising metal 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 comprising polyamides
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/09—Layered products comprising a layer of metal comprising metal 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 comprising polyesters
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • 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
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • 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
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/28—Multiple coating on one surface
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • 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

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  • 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)
  • Photovoltaic Devices (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a back plate for a photovoltaic module, a preparation method thereof and the photovoltaic module, wherein the back plate for the photovoltaic module comprises the following components: a metal substrate layer; the chemical conversion layer is arranged on the first surface of the metal base material layer; the transition layer is arranged on one surface of the chemical conversion layer, which is far away from the metal base material layer; the adhesive layer is arranged on one side, away from the chemical conversion layer, of the transition layer; the insulating layer is arranged on one surface, deviating from the transition layer, of the adhesive layer; a passivation layer disposed on the second side of the metal substrate layer. In the embodiment of the invention, the passivation layer is arranged on the second surface of the metal base material layer, so that the second surface of the metal base material layer can be prevented from being corroded; through set up chemical conversion layer, transition layer and gluing layer between metal substrate layer and insulating layer, can improve the adhesion stress between insulating layer and the metal substrate layer, prevent under long-term use that insulating layer and metal substrate layer break away from.

Description

Backboard for photovoltaic module, preparation method of backboard and photovoltaic module
Technical Field
The invention relates to the technical field of solar photovoltaics, in particular to a back plate for a photovoltaic module, a preparation method of the back plate and the photovoltaic module.
Background
The photovoltaic module integration (BIPV) technology is a technology combining the photovoltaic module technology with a building, and the BIPV module can be applied to the top of the building and the outer vertical surface of the building so as to reduce the external energy consumption of the building, so that the BIPV module is required to meet the requirements of the photovoltaic module and the building at the same time; for example, it is desirable to meet the strength requirements of photovoltaic modules and the fire and water protection requirements of buildings.
At present, a mode of the BIPV component adopts a high molecular material and a flame retardant as a back panel material, but the fireproof requirements of buildings cannot be met; the other mode is that the photovoltaic module is directly pressed on the metal back plate by adopting structural adhesive or hot melt adhesive, but the problem that the photovoltaic module falls off can occur because the metal back plate is easy to corrode and age, and the structural adhesive is bonded with the metal back plate and the photovoltaic module and has poor firmness, and the problem of slippage and creep easily occurs when the thermosol is bonded with the metal back plate and the photovoltaic module are applied at high temperature.
Disclosure of Invention
The invention provides a back sheet for a photovoltaic module, which can solve at least one problem.
In a first aspect, an embodiment of the present invention provides a backsheet for a photovoltaic module, where the backsheet includes:
a metal substrate layer;
the chemical conversion layer is arranged on the first surface of the metal base material layer;
the transition layer is arranged on one surface of the chemical conversion layer, which is far away from the metal base material layer;
the adhesive layer is arranged on one side, away from the chemical conversion layer, of the transition layer;
the insulating layer is arranged on one surface, away from the transition layer, of the adhesive layer;
and the passivation layer is arranged on the second surface of the metal base material layer.
Optionally, the material of the chemical conversion layer comprises: any one of iron phosphate, zinc phosphate, manganese phosphate, and chromate.
Optionally, the material of the transition layer comprises: any one of phenolic resin, bismaleimide resin, cyanate resin and acrylic resin.
Optionally, the material of the adhesive layer includes: polyester adhesives.
Optionally, the polyester-based adhesive comprises: epoxy modified polyurethane adhesive.
Optionally, the insulating layer comprises: the insulating layer comprises an insulating layer body and a binder arranged on the surface of the insulating layer.
Optionally, the material of the insulating layer body includes: any one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polypropylene, polyethylene, polyamide, and polyphenylene oxide.
Optionally, the material of the binder comprises: polyester copolymer, polyurethane, acrylate and silane coupling agent.
Optionally, the color of the transition layer in the preset region includes: white; the insulating layer and the adhesive layer are both made of transparent materials.
Optionally, at least one of the transition layer, the adhesive layer, and the insulating layer is colored.
In a second aspect, an embodiment of the present invention provides a photovoltaic module, including any one of the above-described back sheets for a photovoltaic module; the photovoltaic module further includes:
the first packaging adhesive film layer is arranged on one surface, deviating from the adhesive layer, of the insulating layer;
the photovoltaic cell piece is arranged on one surface, deviating from the back plate, of the first packaging adhesive film layer;
the second packaging adhesive film layer is arranged on one surface, back to the first packaging adhesive film layer, of the photovoltaic cell sheet;
and the front plate layer is arranged on one surface of the second packaging adhesive film layer deviating from the photovoltaic cell piece.
In a third aspect, an embodiment of the present invention provides a method for preparing a back sheet for a photovoltaic module, including:
providing a metal base material layer, and carrying out surface treatment on the metal base material layer;
roll coating a chemical conversion layer mother solution on the first surface of the metal base material layer, roll coating a passivation treatment solution on the second surface of the metal base material layer, and then drying to obtain a chemical conversion layer on the first surface of the metal base material layer and a passivation layer on the second surface of the metal base material layer;
spraying a transition powder coating on one surface of the chemical conversion layer, which is far away from the metal base material layer, by adopting an electrostatic spraying process, and then curing to obtain a transition layer;
mixing an adhesive, a solvent and a curing agent, coating the mixture on one surface of the transition layer, which is far away from the chemical conversion layer, and drying to obtain an adhesive layer;
preparing an insulating layer, placing the insulating layer on one surface of the adhesive layer, which is far away from the transition layer, and then performing pressing and curing treatment to obtain the back plate.
In an embodiment of the present invention, a back sheet for a photovoltaic module includes: a metal substrate layer; the chemical conversion layer is arranged on the first surface of the metal base material layer; the transition layer is arranged on one surface of the chemical conversion layer, which is far away from the metal base material layer; the adhesive layer is arranged on one side, away from the chemical conversion layer, of the transition layer; the insulating layer is arranged on one surface, deviating from the transition layer, of the adhesive layer; a passivation layer disposed on the second side of the metal substrate layer. In the embodiment of the invention, the passivation layer is arranged on the second surface of the metal base material layer, so that the second surface of the metal base material layer can be prevented from being corroded; through set up chemical conversion layer, transition layer and gluing layer between metal substrate layer and insulating layer, can improve the adhesion stress between insulating layer and the metal substrate layer, prevent under long-term use that insulating layer and metal substrate layer break away from.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 shows a schematic structural view of a back sheet for a photovoltaic module in an embodiment of the present invention;
FIG. 2 illustrates a schematic structural diagram of a transition layer in an embodiment of the present invention;
fig. 3 shows a flow chart of steps of a method for preparing a back sheet for a photovoltaic module in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a back sheet for a photovoltaic module according to an embodiment of the present invention is shown, the back sheet including: a metal base material layer 10; a chemical conversion layer 20 disposed on a first side of the metal substrate layer 10; a transition layer 30 disposed on a side of the chemical conversion layer 20 facing away from the metal substrate layer 10; an adhesive layer 40 disposed on a side of the transition layer 30 facing away from the chemical conversion layer 20; an insulating layer 50 disposed on a side of the adhesive layer 40 facing away from the transition layer 30; and a passivation layer 60 disposed on the second surface of the metal base material layer 10.
In general, the thermal expansion coefficient difference between the polymer material and the metal material is large, so that under the condition of large temperature difference, large thermal stress exists in the back plate, and therefore the polymer material is directly bonded with the metal material, thermal fatigue occurs, and then debonding occurs; in the embodiment of the invention, the chemical conversion layer 20 is disposed on the metal substrate layer 10, so as to prevent the metal substrate layer 10 from directly contacting with the polymer material (the transition layer 30, the adhesive layer 40, and the insulating layer 50), and further prevent the metal substrate layer 10 from being separated from the transition layer 30, the adhesive layer 40, and the insulating layer 50.
In the embodiment of the present invention, the arrangement of the transition layer 30 can improve the shear resistance of the entire backplane, and can enable the transition layer 30 and the adhesive layer 40 to be firmly bonded. And transition layer 30 can effectual reduction transmit the thermal stress on gluing layer 40, and then reduce the deformation on gluing layer to the condition of backplate can not spill at the in-process that forms gluing layer 30 messenger's gluing layer material. Wherein, the shear modulus of transition layer 30 intervenes between the shear modulus of metal substrate layer 10 and the shear modulus of gluing layer 40, and in addition, transition layer 30 also can reduce the influence of gluing layer 40 to metal substrate layer 10 to prevent the corrosion of metal substrate layer 10.
In the embodiment of the present invention, the arrangement of the transition layer 30 can increase the selection range of the material of the adhesive layer 40, and can reduce the cost of the back plate preparation; in addition, the compounding of the transition layer 30 and the adhesive layer 40 can relieve stress in the entire backplane, reducing the risk of delamination of the layers in the backplane.
In the embodiment of the present invention, the material of the metal base material layer 10 includes: an aluminum-zinc plated steel plate material; the thickness of the metal base layer 10 includes: 0.1mm-1 mm. The metal base material layer 10 includes: cold-rolled steel sheet with yield strength of 100MPa-1000 MPa; wherein, the grammage of the plating layer of the metal base material layer 10 includes: 10g/m2-200g/m2. Wherein the metal base materialLayer 10 improves the creep resistance of the backsheet, enabling the backsheet to be used in scenarios with greater shear stress requirements.
In an embodiment of the present invention, the material of the passivation layer 60 includes: a complex of Cr2O3 and ZnCrO 4; the thickness of the passivation layer 60 is 0.1 μm to 2 μm. The passivation layer 60 serves to prevent the second surface of the metal base material layer 10 from being corroded.
In an embodiment of the present invention, the material of the chemical conversion layer 20 includes: any one of iron phosphate, zinc phosphate, manganese phosphate, and chromate. Wherein the thicknesses of the chemical conversion layer 20 include: 1-5 μm.
In an embodiment of the present invention, the material of the transition layer 30 includes: any one of phenolic resin, bismaleimide resin, cyanate resin and acrylic resin. Wherein, the material of transition layer 30 is high cohesive energy thermosetting resin layer, and thickness includes: 2-10 μm.
In the embodiment of the present invention, the material of the adhesive layer 40 includes: polyester adhesives. Wherein, the polyester adhesive comprises: epoxy modified polyurethane adhesive. Wherein the grammage of the adhesive layer 40 includes: 2g/m2-20g/m2。
Wherein, epoxy modified polyurethane gluing agent is as the material of gluing layer 40, can avoid when forming gluing layer 40 on transition layer 30, and the material on gluing layer flows from the edge of transition layer, influences the security performance and the aesthetic property that the backplate was used for among the photovoltaic module. In particular, the creepage distance of the photovoltaic module is affected.
In an embodiment of the present invention, the insulating layer 50 includes: the insulating layer comprises an insulating layer body and a binder arranged on the surface of the insulating layer. Among them, the adhesive can improve the adhesive property of the surface of the insulating layer 50. The thickness of the insulating layer 50 includes: 100-500 μm.
In an embodiment of the present invention, the material of the insulating layer body includes: any one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polypropylene, polyethylene, polyamide, and polyphenylene oxide.
In an embodiment of the present invention, the material of the adhesive includes: polyester copolymer, polyurethane, acrylate and silane coupling agent. Among them, a compound of an acrylate and a silane coupling agent is preferably used.
In the embodiment of the present invention, referring to fig. 2, the colors of the transition layer 30 in the preset area 31 include: white; the insulating layer 50 and the adhesive layer 40 are both made of transparent materials.
In an embodiment of the present invention, a battery module is disposed on a back plate, the battery module including: a plurality of battery pieces which are arranged in parallel, wherein gaps are formed among the battery pieces; the preset region 31 is a corresponding region of the gap between the battery pieces on the transition layer 30, wherein the corresponding region of the battery piece on the transition layer 30 is a region 32 in fig. 2.
In the embodiment of the invention, white is arranged in the area on the transition layer corresponding to the gap between the cell pieces, and the insulating layer 50 and the adhesive layer 40 are made of transparent materials, so that when sunlight irradiates between the cell pieces, sunlight can pass through the insulating layer 50 and the adhesive layer 40 and is reflected by the white of the transition layer, the reflection of the sunlight can be increased, and the power of the photovoltaic module can be improved. The region 32 on the transition layer 30 may be any color, and is not limited herein.
In the embodiment of the present invention, at least one of the transition layer 30, the adhesive layer 40 and the insulating layer 50 is colored.
In the embodiment of the present invention, one or more of the transition layer 30, the adhesive layer 40 and the insulating layer 50 may be colored, so that the back plate has different colors, thereby increasing the aesthetic effect. Pigments may be added to the transition layer 30 for different colors.
In an embodiment of the present invention, there is also provided a photovoltaic module, including the back sheet for a photovoltaic module described in any one of the above; the photovoltaic module further includes: the first packaging adhesive film layer is arranged on one surface, deviating from the adhesive layer, of the insulating layer; the photovoltaic cell piece is arranged on one surface, deviating from the back plate, of the first packaging adhesive film layer; the second packaging adhesive film layer is arranged on one surface, back to the first packaging adhesive film layer, of the photovoltaic cell sheet; and the front plate layer is arranged on one surface of the second packaging adhesive film layer deviating from the photovoltaic cell piece.
In an embodiment of the present invention, the front plate layer includes: coated glass or organic composite films; the thickness of the front plate layer includes: 1mm-2.5mm, and the light transmittance is more than or equal to 94 percent; wherein, the material of the organic composite film comprises: any of PMMA (polymethyl methacrylate), PC (polycarbonate), PTFE (polytetrafluoroethylene), ETFE (ethylene-tetrafluoroethylene copolymer), acrylic resin, polyurethane; the organic composite film further includes: a reinforcing material; the reinforcing material comprises: glass fiber cloth.
Wherein, the material of first encapsulation glued membrane layer and second encapsulation glued membrane layer includes: EVA (ethylene-vinyl acetate copolymer), POE (polyethylene oxide), PDMS (polydimethylsiloxane), PVB (polyvinyl butyral), or an ionomer; wherein the gram weight of the first packaging adhesive film layer and the second packaging adhesive film layer is more than or equal to 360g/m2The light transmittance is greater than or equal to 90%.
In the embodiment of the invention, the photovoltaic cells can be connected in series through a conventional metal solder strip, and can also be connected through a conductive adhesive. And laminating the back plate, the first packaging adhesive film layer, the photovoltaic cell piece, the second packaging adhesive film layer and the front plate layer after lamination to obtain the photovoltaic module.
In an embodiment of the present invention, a back sheet for a photovoltaic module includes: a metal substrate layer; the chemical conversion layer is arranged on the first surface of the metal base material layer; the transition layer is arranged on one surface of the chemical conversion layer, which is far away from the metal base material layer; the adhesive layer is arranged on one side, away from the chemical conversion layer, of the transition layer; the insulating layer is arranged on one surface, deviating from the transition layer, of the adhesive layer; a passivation layer disposed on the second side of the metal substrate layer. In the embodiment of the invention, the passivation layer is arranged on the second surface of the metal base material layer, so that the second surface of the metal base material layer can be prevented from being corroded; through set up chemical conversion layer, transition layer and gluing layer between metal substrate layer and insulating layer, can improve the adhesion stress between insulating layer and the metal substrate layer, prevent under long-term use that insulating layer and metal substrate layer break away from.
Referring to fig. 3, a flowchart illustrating steps of a method for manufacturing a back sheet for a photovoltaic module according to an embodiment of the present invention is shown, the method including the steps of:
step 101, providing a metal base material layer, and performing surface treatment on the metal base material layer.
In an embodiment of the present invention, the surface treatment includes: degreasing, cleaning and drying.
And 102, rolling a chemical conversion layer mother solution on the first surface of the metal base material layer, rolling a passivation treatment solution on the second surface of the metal base material layer, and drying to obtain a chemical conversion layer on the first surface of the metal base material layer and a passivation layer on the second surface of the metal base material layer.
In an embodiment of the present invention, a passivation treatment liquid includes: an acidic solution of sodium dichromate, the pH of the acidic solution being between 1 and 4; the chemical conversion layer mother liquor comprises: zinc phosphate solution with pH of 1-4. Wherein, the drying is carried out in an oven, and the drying temperature is lower than 55 ℃.
103, spraying a transition powder coating on one surface of the chemical conversion layer, which is far away from the metal base material layer, by adopting an electrostatic spraying process, and then curing to obtain a transition layer.
In an embodiment of the invention, the thickness of the sprayed transition powder coating is less than or equal to 10 μm. Wherein, the transition layer material is a powder coating, and the preparation process is more environment-friendly and efficient.
And 104, mixing an adhesive, a solvent and a curing agent, coating the mixture on one surface of the transition layer, which is far away from the chemical conversion layer, and drying to obtain the adhesive layer.
In an embodiment of the present invention, the materials of the solvent include: ethyl acetate; specifically, the solvent and the adhesive are uniformly mixed according to a preset proportion, and then the curing agent is added to be fully and uniformly stirred. Wherein, the coating mode includes: flat roll coating, gravure coating, and extrusion coating; drying adopts a drying tunnel to volatilize the solvent.
And 105, preparing an insulating layer, placing the insulating layer on one surface of the adhesive layer, which is far away from the transition layer, and then performing pressing and curing treatment to obtain the back plate.
Wherein, preparing the insulating layer comprises: obtaining the insulating layer material after corona treatment to obtain the insulating layer. Specifically, the pressing temperature includes: 60 ℃ -80 ℃, and the pressing pressure comprises: 90kg/cm2～145kg/cm2The curing temperature includes: 45-75 ℃, and the curing time comprises: 24h-72 h; in the embodiment of the invention, the laminated back plate is rolled and then placed into a curing room for curing.
In an embodiment of the present invention, a method for preparing a back sheet includes: providing a metal base material layer, and carrying out surface treatment on the metal base material layer; roll coating a chemical conversion layer mother solution on the first surface of the metal base material layer, roll coating a passivation treatment solution on the second surface of the metal base material layer, and then drying to obtain a chemical conversion layer on the first surface of the metal base material layer and a passivation layer on the second surface of the metal base material layer; spraying a transition powder coating on one surface of the chemical conversion layer, which is far away from the metal base material layer, by adopting an electrostatic spraying process, and then curing to obtain a transition layer; mixing an adhesive, a solvent and a curing agent, coating the mixture on one surface of the transition layer, which is far away from the chemical conversion layer, and drying to obtain an adhesive layer; preparing an insulating layer, placing the insulating layer on one surface of the adhesive layer, which is far away from the transition layer, and then performing pressing and curing treatment to obtain the back plate. In the embodiment of the invention, the passivation layer is formed on the second surface of the metal base material layer, so that the second surface of the metal base material layer can be prevented from being corroded; through forming chemical conversion layer, transition layer and gluing layer between metal substrate layer and insulating layer, can improve the adhesion between insulating layer and the metal substrate layer, prevent under long-term use that insulating layer and metal substrate layer break away from.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the embodiments of the application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (12)

1. A backsheet for a photovoltaic module, comprising:
a metal substrate layer;
the chemical conversion layer is arranged on the first surface of the metal base material layer;
the transition layer is arranged on one surface of the chemical conversion layer, which is far away from the metal base material layer;
the adhesive layer is arranged on one side, away from the chemical conversion layer, of the transition layer;
the insulating layer is arranged on one surface, away from the transition layer, of the adhesive layer;
and the passivation layer is arranged on the second surface of the metal base material layer.
2. The backsheet for a photovoltaic module according to claim 1, wherein the material of said chemical conversion layer comprises: any one of iron phosphate, zinc phosphate, manganese phosphate, and chromate.
3. The backsheet for a photovoltaic module according to claim 1, wherein the material of the transition layer comprises: any one of phenolic resin, bismaleimide resin, cyanate resin and acrylic resin.
4. The backsheet for a photovoltaic module according to claim 1, wherein a material of the adhesive layer comprises: polyester adhesives.
5. The backsheet for a photovoltaic module according to claim 4, wherein said polyester-based adhesive comprises: epoxy modified polyurethane adhesive.
6. The backsheet for a photovoltaic module according to claim 1, wherein the insulating layer comprises: the insulating layer comprises an insulating layer body and a binder arranged on the surface of the insulating layer.
7. The backsheet for a photovoltaic module according to claim 6, wherein the material of the insulating layer body comprises: any one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polypropylene, polyethylene, polyamide, and polyphenylene oxide.
8. The backsheet for a photovoltaic module according to claim 6, wherein the material of the adhesive comprises: polyester copolymer, polyurethane, acrylate and silane coupling agent.
9. The backsheet for a photovoltaic module according to claim 1, wherein the color of the transition layer at the predetermined region comprises: white; the insulating layer and the adhesive layer are both made of transparent materials.
10. The backsheet for a photovoltaic module according to claim 1, wherein at least one of said transition layer, said adhesive layer and said insulating layer is colored.
11. A photovoltaic module comprising the backsheet for a photovoltaic module according to any one of claims 1 to 10; the photovoltaic module further includes:
the first packaging adhesive film layer is arranged on one surface, deviating from the adhesive layer, of the insulating layer;
the photovoltaic cell piece is arranged on one surface, deviating from the back plate, of the first packaging adhesive film layer;
the second packaging adhesive film layer is arranged on one surface, back to the first packaging adhesive film layer, of the photovoltaic cell sheet;
and the front plate layer is arranged on one surface of the second packaging adhesive film layer deviating from the photovoltaic cell piece.
12. A preparation method of a back sheet for a photovoltaic module is characterized by comprising the following steps:
providing a metal base material layer, and carrying out surface treatment on the metal base material layer;
roll coating a chemical conversion layer mother solution on the first surface of the metal base material layer, roll coating a passivation treatment solution on the second surface of the metal base material layer, and then drying to obtain a chemical conversion layer on the first surface of the metal base material layer and a passivation layer on the second surface of the metal base material layer;
spraying a transition powder coating on one surface of the chemical conversion layer, which is far away from the metal base material layer, by adopting an electrostatic spraying process, and then curing to obtain a transition layer;
mixing an adhesive, a solvent and a curing agent, coating the mixture on one surface of the transition layer, which is far away from the chemical conversion layer, and drying to obtain an adhesive layer;
preparing an insulating layer, placing the insulating layer on one surface of the adhesive layer, which is far away from the transition layer, and then performing pressing and curing treatment to obtain the back plate.
CN202011384906.XA 2020-12-01 2020-12-01 Backboard for photovoltaic module, preparation method of backboard and photovoltaic module Pending CN112563360A (en)

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PCT/CN2021/133233 WO2022116893A1 (en) 2020-12-01 2021-11-25 Backsheet for photovoltaic assembly and manufacturing method therefor, and photovoltaic assembly

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