CN203826402U - Transparent solar cell backboard and solar cell assembly - Google Patents

Abstract

The utility model relates to a transparent solar cell backboard and a solar cell assembly. The transparent solar cell backboard includes a transparent base layer and a weather-resistant transparent film layer. In particular, the transparent solar cell backboard further includes a A weather-resistant transparent coating on one side and a transparent polymer adhesive layer formed between the other side of the transparent base layer and the weather-resistant transparent film layer for bonding the transparent base layer and the weather-resistant transparent film layer . The product of the utility model has high transparency, good weather resistance, easy component repair, good heat conduction efficiency, low production cost and easy market promotion.

Description

A kind of transparent solar battery back plate and solar battery module

technical field

The utility model mainly relates to a transparent solar cell backboard and a solar cell assembly. the

Background technique

A solar panel is usually a stacked structure, mainly including a glass layer, an EVA encapsulation layer, a silicon wafer, an EVA encapsulation layer and a transparent solar cell backplane, in which the silicon wafer is sealed and wrapped by two layers of EVA film. The transparent solar cell backplane is mainly used for N-type crystalline silicon solar cells, and the building integrated solar power generation module (BIPV) achieves beautiful colors, and the light transmission is in harmony with the building, meeting the design requirements. At the same time, it ensures the mechanical strength of the solar panel and prevents water vapor from penetrating into the sealing layer, which affects the life of the battery and the power generation efficiency. Since the transparent solar cell back sheet is the outermost part of the solar cell panel, the back sheet is required to have good environmental erosion resistance, so the manufactured transparent solar cell back sheet must have good moisture and heat aging resistance, high temperature resistance, hydrolysis resistance, and low Water vapor transmission rate, corrosion resistance, and ability to resist ultraviolet light.

In the prior art, the transparent solar cell backsheet is mainly composed of a transparent fluorine-containing film with a thickness of 0.02-0.03 mm, a PET transparent base layer with a thickness of 0.18-0.30 mm, and an EVA or polyolefin film or a transparent fluorine-containing film with a thickness of 0.025-0.1 mm. Composite film materials. The backplane has the following disadvantages: the thick backplane has poor heat conduction efficiency, it is difficult to repair components, and the transparent film layer of EVA or polyolefin film has poor long-term aging and weather resistance. The transparent fluorine-containing film is expensive, and the transparent film layer of EVA or polyolefin film is not transparent enough (optical fiber transmittance is lower than 85%), which cannot meet the requirement of transparency.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a transparent coating with good transparency, high thermal conductivity, easy component repair, good long-term aging resistance, transparent film layer on the air surface and EVA contact surface of the component A new type of transparent solar cell backsheet.

The utility model also provides a solar battery component with high thermal conductivity, easy component repair and good long-term aging resistance.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A transparent solar cell backboard, comprising a transparent base layer and a weather-resistant transparent film layer, the transparent solar cell back plate also includes a weather-resistant transparent coating formed on one side of the transparent base layer and formed on the other side of the transparent base layer A transparent polymer adhesive layer for bonding the transparent base layer and the weather-resistant transparent film layer between the weather-resistant transparent film layer.

According to a further embodiment of the utility model:

The thickness of the weather-resistant transparent coating is 0.1-30 microns. The weather-resistant transparent coating can be composed of one or more combinations of polytetrafluoroethylene resin, polychlorotrifluoroethylene resin, acrylic resin, polyurethane, epoxy resin, and silicone rubber that have UV absorption properties and are UV-resistant at the same time. .

The thickness of the transparent polymer adhesive layer is 1-30 microns. The transparent polymer adhesive may be an adhesive layer composed of one or a combination of polyurethane adhesives, acrylic resin adhesives, and epoxy resin adhesives that have UV absorption properties and UV resistance.

The transparent base layer is a PET transparent base layer with a thickness of 0.01-10 mm and a transparency of 70-99%.

The weather-resistant transparent film layer can and is preferably made of one of transparent polyvinyl fluoride film layer, transparent polyvinylidene fluoride film layer, transparent high-weather-resistant PET film layer, transparent modified polymethyl methacrylate film layer, and its thickness It is 5~200 microns.

According to a preferred aspect of the present utility model: the thickness of the transparent base layer is 0.2-0.3 millimeters, the thickness of the weather-resistant transparent film layer is 5-50 microns, and the thickness of the weather-resistant transparent coating is 1-25 microns, so The thickness of the transparent polymer adhesive layer is 5-20 microns.

Another technical solution of the present utility model is: a solar cell module, which includes the above-mentioned transparent solar cell backboard.

Due to the implementation of the above-mentioned technical solution, the utility model has the following advantages compared with the prior art:

The transparent solar cell backboard of the present utility model has a structure of at least four layers, which is coated with a weather-resistant transparent coating with UV absorption performance and UV resistance on the transparent base layer, and a weather-resistant transparent film layer formed on the other side of the transparent base layer The UV-absorbing and UV-resistant transparent polymer adhesive layer used to bond the transparent base layer and the weather-resistant transparent film layer between them can reduce the thickness of the solar cell backsheet, improve thermal conductivity and transparency, and make the module It is easier to repair and has better weather resistance.

Description of drawings

Fig. 1 is the structural representation of the transparent solar cell backboard of the present utility model;

Fig. 2 is the structural schematic diagram of the solar cell assembly of the present utility model;

In the figure: 1. Transparent base layer; 2. Weather-resistant transparent film layer; 3. Weather-resistant transparent coating layer; 4. Transparent polymer adhesive layer; 5. EVA packaging layer; 6. Cell sheet; 7. Glass layer.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The utility model provides a transparent solar battery back plate capable of high thermal conductivity, high transparency, easy repair and good weather resistance.

Referring to Fig. 1, the transparent solar cell backsheet of the present invention has a four-layer structure, including a weather-resistant transparent film layer 2, a transparent polymer adhesive layer 4, a transparent base layer 1 and a weather-resistant transparent coating layer 3 arranged in sequence from top to bottom , wherein: the weather-resistant transparent film layer 2 and the transparent base layer 1 are bonded by a transparent polymer adhesive layer 4, and the weather-resistant transparent coating layer 3 is a transparent coating layer directly formed on the transparent base layer 1.

In this example, the transparent base layer 1 is a PET transparent base layer with a thickness of 0.1-10 mm, preferably 0.2-0.3 mm, and a specific thickness of 0.25 mm or 0.3 mm.

In this example, the weather-resistant transparent film layer 2 is a transparent polyvinylidene fluoride film layer (PVDF). This transparent film layer can also be a transparent polyvinylidene fluoride film layer (ETFE), or a transparent high-weather-resistant PET film layer. The thickness of the weather-resistant transparent film layer is 5-200 microns, preferably 15-50 microns, and the specific thickness can be 15 microns, 20 microns, 25 microns, 30 microns, 50 microns, etc.

In this example, the weather-resistant transparent coating 3 is a polytetrafluoroethylene-based transparent film layer that has UV absorption properties and is UV-resistant. It can also choose a polychlorotrifluoroethylene-based transparent film layer, or an acrylic resin-based transparent film layer. The thickness of the weather-resistant transparent coating 3 can be 0.1 ~ 30 microns, the preferred thickness is 1 ~ 25 microns, and the specific thickness can be 3 microns, 5 microns, 7 microns, 10 microns, 15 microns, 20 microns, 25 microns, etc.

In this example, the transparent polymer adhesive layer 4 is formed of a UV-absorbing and UV-resistant polyurethane adhesive, and an acrylic resin adhesive can also be selected. The thickness of the transparent polymer adhesive layer 4 is 1-30 microns, preferably 5-20 microns, and the specific thickness can be 10 microns, 15 microns, 20 microns, etc.

Referring to Fig. 2, the above-mentioned transparent solar cell backplane is assembled with the EVA encapsulation layer 5, the battery sheet 6, and the glass layer 7 to obtain a solar cell assembly, which has a weather-resistant transparent film layer 2, a transparent Polymer adhesive layer 4 , transparent base layer 1 , EVA encapsulation layer 5 , battery sheet 6 , EVA encapsulation layer 5 , and glass layer 7 .

The transparent solar battery back plate of the utility model has high light transmittance (70%-99%), thermal conductivity (0.322 W/mK), excellent weather resistance (UV-60kwh, △b=0.5), and good rework performance , no residue. In contrast, the light transmittance of the traditional transparent solar cell backsheet, especially the light transmittance of the EVA surface is not high enough (light transmittance 50%-85%), the thermal conductivity is low (0.248 W/mK), and the weather resistance Poor performance (UV-60kwh, △b ≥ 2.5), difficult to repair, and the transparent film layer of polyolefin film has residue when repairing.

In summary, the product of the present invention has good weather resistance, high transparency, easy component repair, good heat conduction efficiency, low production cost, and easy market promotion.

The utility model has been described in detail above, its purpose is to allow those familiar with the technology in this field to understand the content of the utility model and implement it, and can not limit the scope of protection of the utility model. All equivalent changes or modifications made in essence shall fall within the protection scope of the present utility model.

Claims (8)

1. A transparent solar cell back plate, comprising a transparent base layer and a weather-resistant transparent film layer, characterized in that, the transparent solar cell back plate also includes a weather-resistant transparent coating formed on one side of the transparent base layer and formed on the transparent base layer A transparent polymer adhesive layer for bonding the transparent base layer and the weather-resistant transparent film layer between the other side of the transparent base layer and the weather-resistant transparent film layer. 2 . The transparent solar cell back sheet according to claim 1 , wherein the thickness of the weather-resistant transparent coating is 0.1-30 microns. 3 . The transparent solar battery back sheet according to claim 1 , wherein the transparent polymer adhesive layer has a thickness of 1-30 microns. 4 . 4 . The transparent solar battery back sheet according to claim 1 , wherein the transparent base layer is a PET transparent base layer with a thickness of 0.01-10 mm. 5. The transparent solar battery back sheet according to claim 1, wherein the weather-resistant transparent film layer is a UV-resistant transparent polyvinyl fluoride film layer, a transparent polyvinylidene fluoride film layer, a transparent high-weather-resistant PET film layer, One of the transparent modified polymethyl methacrylate film layers. 6. The transparent solar battery back sheet according to claim 1 or 5, wherein the thickness of the weather-resistant transparent film layer is 5-200 microns. 7. The transparent solar battery back sheet according to claim 1, wherein the thickness of the transparent base layer is 0.2-0.3 mm, the thickness of the weather-resistant transparent film layer is 5-50 microns, and the weather-resistant transparent coating The thickness of the layer is 1-25 microns, and the thickness of the transparent polymer adhesive layer is 5-20 microns. 8. A solar cell module, characterized in that the solar cell module comprises the transparent solar cell back sheet according to any one of claims 1-7.