Inner film for thermally conductive solar cell backsheet and thermally conductive solar cell backsheet

Abstract

The invention discloses an inner layer film used for a heat-conducting solar cell backboard. The thickness of the inner layer film is 0.1-0.3 mm; in parts by mass, it consists of the following components: 30-80 parts of polyethylene, polyethylene 30-80 parts of propylene, 20-25 parts of spherical alumina, 2-3 parts of aluminum powder, 0.1-5 parts of additives; the size of the spherical alumina is 500-800nm; 50-200nm. The test proves: the interlayer peeling force of the backboard of the present invention can reach more than 20N / cm, thereby has extremely high interlayer adhesive force, meanwhile, the thermal conductivity of the backboard is greater than 0.6K (w / m.k), and the backboard It also has high adhesion, high barrier properties, high mechanical strength and excellent low temperature impact resistance, which can fully meet the requirements of solar cell modules.

Description

technical field [0001] The invention relates to an inner film used for a heat-conducting solar battery back plate and a heat-conducting solar battery back plate, belonging to the technical field of solar battery back plates. Background technique [0002] With the depletion of non-renewable energy sources and increasingly serious environmental problems, solar energy, as a clean energy source, has received unprecedented attention and attention. Solar power generation (also known as photovoltaic power generation) is one of the main ways to effectively utilize solar energy, and as the core component of solar power generation, the reliability of solar cells (also known as photovoltaic cells) directly determines the efficiency of solar power generation. [0003] In the prior art, a solar cell is generally composed of an upper cover plate, an adhesive film, a battery sheet, an adhesive film and a solar back sheet. Among them, the solar backsheet is an important part of the solar c...

AI Technical Summary

Problems solved by technology

However, this backplane has the following problems: (1) Since this preparation process uses organic solvent glue, the volatilization of the organic solvent will cause environmental pollution, and the recovery of the solvent will also increase the preparation cost

In addition, due to the need to go through two times of gluing, drying and compounding, and post-curing treatment, the production efficiency of the backplane is low

(2) Fluoroplastic film is used as the weather-resistant layer in the backsheet, which has excellent long-term outdoor aging resistance, but the high cost of the fluoroplastic film itself will limit its larger-scale application; in addition, in the future, solar modules will be scrapped At that time, the excellent corrosion resistance and aging resistance of fluoroplastic film itself prevented the environment from degrading it. In the future, fluoroplastic pollution will be more difficult to deal with than the current white pollution

(3) The PET film plastic used in the structural reinforcement layer of the back sheet has poor thermal hydrolysis resistance and will be brittle and cracked in long-term use in a humid and hot environment, resulting in deterioration or failure of solar cell performance

However, the first method improves the heat dissipation performance of the backplane by adding a metal or high thermal conductivity layer, which will undoubtedly increase the manufacturing process and cost of the solar backplane

The second method not only has cost problems (only low-cost thermal conductive fillers can be added), but also affects the interlayer adhesion of the inner, middle and outer layers.

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