Gridding photovoltaic backboard and preparation method thereof

A photovoltaic backplane, grid technology, applied in photovoltaic power generation, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of high process conditions, increased production costs, insufficient molding efficiency, etc., to improve power generation. , Long-term reliable use, ensure full utilization effect

Active Publication Date: 2020-02-21
HANGZHOU FIRST APPLIED MATERIAL CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ultraviolet curing method achieves the composite effect of each layer of the backplane, and the molding efficiency is not enough, and the process conditions are high, which increases the production cost.
[0005] Another example is the Chinese patent CN 107759983A which discloses a patterned transparent backplane material, which can greatly improve the photoelectric conversion efficiency, and also has excellent reliability in terms of heat resistance, insulation performance and aging resistance, but the radiation curing method It also makes the process efficiency lower and the cost higher

Method used

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  • Gridding photovoltaic backboard and preparation method thereof
  • Gridding photovoltaic backboard and preparation method thereof
  • Gridding photovoltaic backboard and preparation method thereof

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preparation example Construction

[0040] The preparation method of gridded photovoltaic backplane comprises the following steps:

[0041] (1) Use the polyvinylidene fluoride casting solution containing titanium dioxide to coat the inner layer of the double-sided coated transparent substrate with a white grid structure; the coating method is screen printing or roller coating. The white grid structure is the area structure corresponding to the cell gap and frame when the photovoltaic module is packaged, and the width of the grid structure is designed according to the customer's module packaging requirements.

[0042] (2) Pre-evaporate the substrate coated with the white grid structure in the air; then the substrate treated in step (1) is precipitated and solidified by the phase inversion method; the phase inversion method is specifically: the step (1) The treated substrate is quickly immersed in a coagulation solution for 0.1-10 minutes; the coagulation solution is water or a mixed solution of water and an organ...

Embodiment 1

[0056] The inner layer of the double-sided coated transparent substrate is coated with white polyvinylidene fluoride casting liquid by screen printing, forming a cross at right angles such as figure 1 As shown, the formed transparent grid backplane structure is as follows image 3 As shown, the casting solution consists of 20 parts of polyvinylidene fluoride powder dissolved in 100 parts of N,N-dimethylformamide solvent under stirring at 60 ° C, and then adding 2 parts of Disperbyk 160 dispersant and 40 parts of The titanium dioxide is stirred and dispersed evenly; then it is precipitated and solidified in a water coagulation bath, and then processed in a 100°C drying tunnel for 3 minutes to obtain a 15μm white grid structure. A 275 μm thick PET film is selected as the transparent substrate, the thickness of the inner layer of the transparent substrate is 10 μm, and the thickness of the outer layer is 18 μm.

Embodiment 2

[0058] Roll coating white polyvinylidene fluoride casting solution on the inner layer of double-sided coated transparent substrate, forming a cross at right angles such as figure 1 As shown, the formed transparent grid backplane structure is as follows image 3 As shown, the casting solution is obtained by dissolving 30 parts of polyvinylidene fluoride powder in 100 parts of acetone solvent under stirring at 35°C, and then adding 1 part of Disperbyk 161 dispersant and 30 parts of titanium dioxide, stirring and dispersing evenly; Then precipitate and solidify in a coagulation bath of water / dipropylene glycol methyl ether=10 / 1, and then pass through a drying tunnel at 115°C for 3 minutes to obtain a white grid structure of 25 μm. A 250 μm thick PET film is selected as the transparent substrate, the thickness of the inner layer of the transparent substrate is 14 μm, and the thickness of the outer layer is 16 μm.

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Abstract

The invention discloses a gridding photovoltaic backboard and a preparation method thereof. The preparation method comprises the following steps: coating a white grid structure on the inner layer of adouble-sided coating type transparent base material by utilizing a polyvinylidene fluoride membrane casting solution containing titanium dioxide; subjecting the treated base material to precipitationand solidification through a phase inversion method; and carrying out post-treatment on the solidified base material. The gridding photovoltaic backboard has good weather resistance, a white grid area has high reflectivity, a non-white grid area has high transmittance, the generation power of a photovoltaic module is effectively improved, and the production process is high in forming speed, mildin process, economical and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic cell packaging, and in particular relates to a gridded photovoltaic backplane and a preparation method thereof. Background technique [0002] With the advent of the era of grid parity for photovoltaics, the technology of photovoltaic modules has been continuously developed, and the cost has been continuously controlled accordingly. Derived from the white backplane and white film, etc., it is to increase the reflectivity of photovoltaic modules on each layer of the battery sheet to sunlight, increase the utilization efficiency of sunlight, and thus make the power generation of the battery sheet higher. When the power generation of photovoltaic modules of the same type increases while the cost remains unchanged, it is equivalent to the reduction of the cost per kilowatt-hour of photovoltaic modules. With the development of high-efficiency battery technology, especially the double-sided battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/049H01L31/054H01L31/18
CPCH01L31/18H01L31/049H01L31/054Y02E10/52Y02P70/50
Inventor 詹志英杨楚峰林建华
Owner HANGZHOU FIRST APPLIED MATERIAL CO LTD
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