Functional backboard preparation method and functional backboard

Abstract

The invention relates to a preparation method of a functional backboard. The functional backboard comprises a grid coating, an inner layer film, a base layer film and an outer layer film which are arranged in sequence; a continuous overprinting device is adopted, and the preparation method comprises the following steps: (a) after the inner layer film and the base layer film are compounded, printing the grid coating on the inner layer film in an overprinting mode, and then compounding the inner layer film and the outer layer film; or (b) printing the grid coating on one surface of the inner-layer film in an overprinting manner, compounding the base-layer film with the outer-layer film, and compounding the other surface of the inner-layer film with the base-layer film; or (c) sequentially compounding the inner layer film with the base layer film and the outer layer film, and then printing a grid coating on the inner layer film. According to the invention, multiple times of coating can be realized, the thickness of the coating is increased, the appearance of the grid coating is ensured, the reflectivity is improved, and the power of a component end is greatly improved; the printing rate can be further improved; the loss of a material end can be reduced to the greatest extent through structural diversified design and process; the cost of the whole backboard is reduced, and the product added value is large.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic modules, in particular to a preparation method of a functional backboard and the functional backboard. Background technique [0002] As the earth's traditional energy is decreasing day by day, the global demand for new energy is increasing. As a new energy source, solar energy is the most abundant energy available to human beings. It can be developed and utilized locally without transportation problems, so it can realize The industrialization of energy photovoltaic conversion is the focus of global attention. [0003] In the field of photovoltaic power generation, because bifacial modules have an advantage in cost per kilowatt-hour, bifacial modules are gradually expanding their market share. Combining with bifacial cell technology, bifacial modules will become the main force of high-efficiency modules, but the difference between bifacial modules is the adoption of double glass Double-...

AI Technical Summary

Problems solved by technology

[0004] However, there are still several problems in the existing technology as follows: 1) With the advantages of photovoltaic grid parity, cost reduction, quality improvement and efficiency increase have gradually become the development direction of the industry. Photovoltaic backplanes are in the middle and upper reaches of the industry, seeking high added value Products, matching the development needs of the industry have gradually become the future development direction of enterprises, so the development route oriented by technological innovation is the general trend; 2) Transparent white grid and white black grid backplane are mainly printed by screen printing or coating line anilox roller Coating, efficiency and functional gains cannot be further improved; 3) The yield rate of the meshed backplane preparation process is low, and the loss is large, especially the cost of the transparent white grid backplane is high, and the low yield rate leads to a great increase in cost; 4 ) At the present stage, double glass has limitations such as excessive outdoor self-explosion, low production yield, difficult installation and transportation, and long working hours for a single watt. The double-glass power station needs to use a high-power tracking system, which increases power consumption. At the same time, the burden on the double-glass component support is heavy, and the failure rate of the tracking system exceeds 20%, which brings more costs.

[0005] Conventional screen printing coating in the prior art has problems such as slow production efficiency and low degree of automation. Conventional gravure printing grid coating has limited thickness. Even if a certain thickness is met, there will be uneven coating thickness and surface appearance. Inconsistencies, as well as the problem of edge jaggedness, affect power generation efficiency. The above two printing methods can only be printed at one time. The structure and process are relatively simple, and the yield, production efficiency and thickness controllability are relatively low.

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