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Low-shrinkage adhesive film for solar cell packaging and preparation method of adhesive film

A solar cell, low shrinkage technology, applied in chemical instruments and methods, applications, circuits, etc., can solve the problems of backplane deformation, thermal shrinkage cannot meet the dimensional stability requirements of through holes, low water vapor transmission, etc. The effect of excellent weather resistance and excellent other properties

Inactive Publication Date: 2020-01-17
SENSIN NEW MATERIAL BEIJING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] PVB (polyvinyl butyral) is a thermoplastic film that has better weather resistance, flexibility and impact resistance than EVA, and has lower water vapor transmission, so it is more suitable for use as an encapsulation material in photovoltaic modules, but The macromolecular chains of the PVB film are oriented during the molding process, and the chain segments relax when heated, so the thermal shrinkage rate of the PVB film cannot meet the dimensional stability requirements of the through holes in the MWT packaging layer, and may cause deformation of the backplane in severe cases

Method used

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  • Low-shrinkage adhesive film for solar cell packaging and preparation method of adhesive film
  • Low-shrinkage adhesive film for solar cell packaging and preparation method of adhesive film
  • Low-shrinkage adhesive film for solar cell packaging and preparation method of adhesive film

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The low-shrinkage MWT solar cell encapsulating adhesive film includes PVB film, PET film and PVB film from top to bottom, and the preparation method is as follows: the PVB film, PET film and PVB film are combined by melting lamination, and the composite film is Two-way stretching, the transverse stretching ratio is 2.5 times, the longitudinal stretching ratio is 3.0 times, after cooling, the far-infrared heating is carried out to 230°C for two longitudinal stretching, the first longitudinal stretching ratio is 2.0 times, and the second longitudinal stretching ratio is 2.0 times. The draw ratio is 1.5 times, the thickness of the PVB film in the prepared composite adhesive film is 0.2mm, and the thickness of the PET film is 0.07mm.

[0023] The raw materials of the PVB film are composed of the following components in parts by weight, and the components are blended and cast into a film through a twin-screw extruder.

[0024]

[0025]

Embodiment 2

[0027] The low-shrinkage MWT solar cell encapsulating adhesive film includes PVB film, PET film and PVB film from top to bottom, and the preparation method is as follows: the PVB film, PET film and PVB film are combined by melting lamination, and the composite film is Two-way stretching, the transverse stretching ratio is 2.5 times, the longitudinal stretching ratio is 3.0 times, after cooling, the far-infrared heating is carried out to 230°C for two longitudinal stretching, the first longitudinal stretching ratio is 2.0 times, and the second longitudinal stretching ratio is 2.0 times. The draw ratio is 1.5 times, the thickness of the PVB film in the prepared composite adhesive film is 0.35mm, and the thickness of the PET film is 0.03mm.

[0028] The raw materials of the PVB film are composed of the following components in parts by weight, and the components are blended and cast into a film through a twin-screw extruder.

[0029]

Embodiment 3

[0031] The difference from Example 1 is that the PET film is biaxially stretched before compounding, and the transverse and longitudinal stretching ratios are 2.5 times, and then laminated and compounded, and then the composite film is longitudinally stretched twice, the first The secondary longitudinal stretch ratio is 3.0 times, and the second longitudinal stretch ratio is 2.0 times.

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Abstract

The invention belongs to the technical field of solar cell packaging, and particularly relates to a low-shrinkage adhesive film for solar cell packaging and a preparation method of the adhesive film.The adhesive film is formed by laminating and compounding three layers of polymer films including a PVB film, a PET (polyester) film and a PVB film in sequence, wherein the PET film is stretched at least twice. The preparation method comprises the following steps: compounding the PVB film, the PET film and the PVB film by melt lamination, performing dual-direction stretching on the composite film,performing cooling, performing far-infrared heating to 220-240 DEG C, and performing longitudinal secondary stretching. According to the technical solution provided by the invention, the thin PET film is added between the PVB films, the PET film is stretched twice, so that the problem of a high and imbalanced bidirectional shrinkage rate of the PVB films is controlled, the excellent weather resistance and other properties of the PVB films are fully utilized, and the adhesive film is particularly suitable for use in metal wrap through (MWT) solar cells.

Description

technical field [0001] The invention belongs to the technical field of solar cell packaging, and in particular relates to a low-shrinkage adhesive film for solar cell packaging and a preparation method thereof. Background technique [0002] MWT (Metal Wrap Through): Metal Wrap Through is used in solar cells. Compared with conventional solar cells, its biggest feature is to omit the main grid line that collects current on the front side, and form through holes on the battery substrate to emit The electrode generates current under the light, which is collected by the thin grid line on the front of the battery, and the collected current is guided to the positive and negative electrodes on the back through the positive silver electrode in the hole (both the positive silver electrode and the Al back field are on the back of the battery). Due to the omission of the busbar, the use of silver paste can be saved, thereby saving costs; in addition, the removal of the busbar increases ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/25C09J7/30C09J129/14C09J11/06C09J11/08B29C69/00B29C55/06B29C55/12H01L31/048B29L7/00B29L9/00
CPCB29C55/065B29C55/12B29C69/00B29L2007/00B29L2009/00C08L2203/204C08L2205/03C09J11/06C09J11/08C09J129/14C09J2203/322C09J2429/00C09J2467/006C09J7/255C09J7/30C09J2301/124C09J2301/312H01L31/0481C08L77/00C08L23/02C08K5/3435C08K5/544C08L79/08B32B17/10761B32B27/306B32B27/36Y02E10/50B32B17/10005B32B2367/00
Inventor 唐超李华
Owner SENSIN NEW MATERIAL BEIJING TECH
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