EVA (ethylene vinyl-acetate copolymer) adhesive film capable of simplifying packaging structure of solar battery

Abstract

The invention relates to an EVA (ethylene vinyl-acetate copolymer) adhesive film capable of simplifying a packaging structure of a solar battery. The EVA adhesive film is prepared from the following raw materials in parts by weight: 100 parts of EVA, 0.5-1.0 part of crosslinking agent, 0.5-5 parts of compatilizer, 0.5-1 part of antioxidant, 0.05-1 part of light stabilizer, 1-10 parts of titanium dioxide and 0.5-1.5 parts of tackifier. The EVA adhesive film is prepared by the following steps: mixing the EVA with other assistants, carrying out melt extrusion, casting to form a film, and finallyrolling to obtain the finished product. The adhesive film provided by the invention is mainly used between a solar battery component and a back panel; and unlike the common EVA packaging adhesive film and back panel material, the adhesive film provided by the invention can simplify the packaging structure of the solar battery, can effectively lower the cost of the solar battery pack, and is beneficial to the further popularization of the solar battery.

Description

technical field [0001] The invention relates to an EVA adhesive film which can simplify the packaging structure of solar cells. The adhesive film is mainly used between solar cell elements and back plate materials, and is used in the field of solar cell component packaging. Background technique [0002] Solar energy is a green, non-polluting and inexhaustible energy source. At present, solar panels are mainly used to convert it into electrical energy, and then use it for other purposes, such as street lamps, water heaters, electric vehicles, etc. Since solar cells are generally used outdoors and the environment is relatively harsh, they need to be protected. They are usually packaged with a glass plate (front plate), packaging film and back plate. The glass plate (front plate) used is mainly low taconite tempered glass, which is located on the solar cell element and has high light transmittance and excellent weather resistance. [0003] Among them, the function of the adhes...

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Problems solved by technology

[0005] The Chinese patent (application number 200810175302.7) mentions a solar composite back film, which consists of the following five layers: a fluorine-containing layer, an adhesive layer, a polyester layer, an adhesive layer, and a 0.2-1mm thick EVA layer. Cross-linking in the module preparation process also has the function of encapsulating cells, but on the one hand, without adding titanium dioxide, the solar utilization rate of the cells is reduced, and the bonding performance with the polyester layer is poor, requiring the use of adhesives, although it can reduce One layer of EVA adhesive film for encapsulation, but it also increases the thickness of EVA in the back film, which does not substantially simplify the encapsulation structure of solar cells

Among them, the polyolefin layer is also added with titanium dioxide, but it is not cross-linked, and the bonding effect is poor. It can only be used as a layer in the backplane material. The packaging process is still complicated, and its performance cannot fully meet the requirements.

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