CN211265498U

CN211265498U - Novel photovoltaic backboard structure and corresponding backboard

Info

Publication number: CN211265498U
Application number: CN201921704764.3U
Authority: CN
Inventors: 李民; 李庆北
Original assignee: Shanghai HIUV Applied Materials Technology Co Ltd
Current assignee: Shanghai HIUV Applied Materials Technology Co Ltd
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-08-14
Anticipated expiration: 2029-10-08

Abstract

The utility model relates to a novel photovoltaic backplate structure, this structure have and only have polymethyl methacrylate layer (PMMA layer)/bond line/poly terephthalic acid-1, 4 cyclohexane dimethanol ester layer (PCT layer), and wherein, the PMMA layer is towards the air surface. The modified PMMA layer in the backboard has good hydrolytic resistance and ultraviolet yellowing resistance. The PCT layer has very excellent dimensional stability, hydrolysis resistance, water vapor transmission resistance, and dielectric properties. The novel photovoltaic backboard structure can be directly used as a backboard or can be a part of the backboard, has relatively low cost, excellent ultraviolet aging resistance and hydrolysis resistance, and is free of fluorine-containing materials.

Description

Novel photovoltaic backboard structure and corresponding backboard

Technical Field

The utility model relates to a solar PV modules technical field specifically indicates a novel photovoltaic backplate structure and corresponding backplate.

Background

The back plate is located on the back of the solar cell, plays a role in protecting and supporting the solar cell, and needs to have excellent long-term aging resistance (ultraviolet, damp heat, dry heat and the like), electrical insulation resistance and water vapor barrier property. The individual polymer materials do not meet the requirements of the photovoltaic industry, and therefore, several layers of materials with complementary properties are generally bonded together. The mainstream structure commonly found on the market at present generally consists of three layers: fluorine-containing layer (alternative material)/PET layer (alternative material)/EVA tie layer (fluorine-containing film, modified EVA, PE, PET, etc.); the solar cell back plate is divided into a TPT photovoltaic back plate, a TPE photovoltaic back plate, a BBF photovoltaic back plate, an EVA solar back plate and the like according to the structure.

The weatherability of the backsheet is critical to the life of the assembly, and after the backsheet is broken, the assembly is not weatherable and water resistant. The result is rapid aging of the EVA, which eventually affects the cell and the entire assembly is scrapped. The weather resistance and the service life of the back plate directly influence the power generation efficiency and the service life of the assembly.

The fluorine-containing back plate has excellent weather resistance, the back plate material is selected from a fluorine-containing film and has common knowledge in the industry of fluorine-containing coatings, only the fluorine-containing material passes long-term outdoor demonstration at present, and the market share of the fluorine-containing back plate exceeds 90 percent. But fluoroplastics are high in cost and not environment-friendly, and the development space of the fluoroplastics is greatly limited.

Therefore, finding a back plate which has relatively low cost, excellent ultraviolet aging resistance and hydrolysis resistance and no fluorine-containing material is a hot point of research.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel photovoltaic backplate structure and corresponding backplate, this backplate cost is cheap relatively, ultraviolet ageing resistance can and hydrolysis resistance can be excellent, no fluorine-containing material uses.

The purpose of the utility model is mainly realized through the following technical scheme: the novel photovoltaic module back plate structure only comprises a polymethyl methacrylate layer (PMMA layer)/an adhesive layer/a poly (1, 4-cyclohexanedimethanol terephthalate) layer (PCT layer), wherein the PMMA layer faces to the air surface.

The utility model also provides a backplate, this backplate structure can directly regard as the backplate also can be a part of backplate.

The PMMA layer and the PCT layer are subjected to modification treatment, have excellent aging resistance and are bonded through an adhesive, and the total thickness of the three-layer structure is 85-500 mu m.

Preferably, the thickness of the PMMA layer is 30-150 μm, the thickness of the bonding layer is 5-50 μm, and the thickness of the PCT layer is 50-300 μm.

Preferably, the thickness of the PMMA layer is 50-100 μm, the thickness of the bonding layer is 5-30 μm, and the thickness of the PCT layer is 100-250 μm.

The utility model has the advantages that:

adopt the utility model discloses a photovoltaic backplate structure, the PMMA layer through modification in this backplate has good hydrolytic resistance, resistant ultraviolet yellowing nature. The modified PCT layer has very excellent dimensional stability, hydrolysis resistance, water vapor transmission resistance, and dielectric properties. The novel photovoltaic backboard structure is relatively low in cost, excellent in ultraviolet aging resistance and hydrolysis resistance and free of fluorine-containing materials.

Drawings

Fig. 1 is the structure schematic diagram of the photovoltaic back plate structure of the utility model.

Reference numerals

1 PMMA layer

2 adhesive layer

3 PCT layer

Detailed Description

The present invention will be described in further detail with reference to embodiments and drawings, but the embodiments of the present invention are not limited thereto.

The utility model provides a manufacturing method of photovoltaic backplate structure, concrete step is:

step 1, PMMA layers with different thicknesses are prepared, and the PMMA layers are subjected to modification treatment and can be prepared through melt co-extrusion;

step 2, preparing PCT layers with different thicknesses, wherein the PCT layers are subjected to modification treatment and can be prepared by biaxial stretching;

and 3, coating a layer of adhesive on one side of the PCT substrate, heating and curing to form an adhesive layer, and laminating the PMMA layer on the adhesive layer.

And obtaining the novel photovoltaic back plate structure.

Specific embodiments of each example are as follows

Novel photovoltaic backboard layer thickness meter

In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims

1. A novel photovoltaic backplate structure which characterized in that: the back plate structure consists of a polymethyl methacrylate layer, a bonding layer and a poly terephthalic acid-1, 4 cyclohexane dimethanol ester layer, wherein the polymethyl methacrylate layer is arranged towards the air.

2. The novel photovoltaic backsheet structure of claim 1 wherein the backsheet structure has a total thickness of 85 to 500 μm.

3. The novel photovoltaic back sheet structure according to claim 1 or 2, wherein the thickness of the polymethyl methacrylate layer is 30 to 150 μm, the thickness of the adhesive layer is 5 to 50 μm, and the thickness of the poly (1, 4-cyclohexanedimethanol terephthalate) layer is 50 to 300 μm.

4. A novel photovoltaic backsheet, wherein said backsheet comprises the backsheet structure of claim 1.