Rear surface protection sheet for solar cell module and solar cell module protected by such protection sheet

A solar cell and backside protection technology, applied in electrical components, applications, circuits, etc., can solve problems such as poor resistance to organic solvents, toxic fluorine gases, and poor economy, and achieve excellent resistance to organic solvents, excellent moisture resistance, and improved The effect of weather resistance

Inactive Publication Date: 2010-10-13
OKURA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] On the other hand, polycarbonate-based (hereinafter referred to as PC) films are very excellent in hydrolysis resistance, but are poor in resistance to organic solvents, for example, there are problems with dry lamination with other films
In addition, fluororesin-based films are excellent in durability, but they are expensive and economical, and there is a problem that toxic fluorine-based gases are generated during incineration.

Method used

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  • Rear surface protection sheet for solar cell module and solar cell module protected by such protection sheet
  • Rear surface protection sheet for solar cell module and solar cell module protected by such protection sheet
  • Rear surface protection sheet for solar cell module and solar cell module protected by such protection sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] Production examples, examples and comparative examples of the present invention will be further described below.

[0047] The performances of the composite film and the back protection sheet were evaluated by the following methods. If the composite film is excellent in thermal shrinkage rate, hydrolysis resistance, and weather resistance, a back protection sheet having sufficient performance can be obtained.

[0048] [Heat shrinkage rate]

[0049] A test film with a length and width of 200×200 mm was heated at 150° C. for 30 minutes in a hot air dryer, and the heat shrinkage rate was measured. The thermal contraction rate in each vertical and horizontal direction was measured before and after heating, and the thermal contraction rate of the larger one was evaluated. If the thermal shrinkage rate is large, when the solar cell module is produced by hot pressing at 150°C, due to the large thermal shrinkage, there is a problem of damaging the copper wire connecting the so...

manufacture example

[0055] Polybutylene terephthalate (PBT, melting point: 225°C, intrinsic viscosity: 1.14) and polycarbonate (number average molecular weight: 25,000) were co-extruded using two types of three-layer T-die, and the following table was prepared Composite membrane shown in 1. And as a comparison, the films shown in Table 1 were produced also for PET, PBT, and PC. It should be noted that, in the composite film 6, titanium dioxide, which is a white pigment, was blended into the PC of the core layer to form a white film. Similarly, for Comparative Film 4, a white film was also produced. Table 1 shows the results of measuring the thermal shrinkage rate of the obtained film.

[0056] [Table 1]

[0057]

constitute

Thickness (μm)

Thickness composition ratio (%)

Heat shrinkage rate (%)

Composite film 1

PBT / PC / PBT

100

25 / 50 / 25

0.22

Composite film 2

PBT / PC / PBT

100

20 / 60 / 20

0.18

Composite film 3

PBT / PC / PB...

Embodiment 1

[0065] [Example 1, Comparative Example 1]

[0066] Silicon dioxide (SiO2) was evaporated on the surface of a PET film with a thickness of 12 μm 2 ) film (heat shrinkage rate: 1.18%) is used as a moisture-proof layer, and is laminated by dry lamination with a polyurethane adhesive to produce figure 1 The back protection sheet having the configuration shown above was used as Example 1. In addition, as Comparative Example 1, a PBT film (comparative films 2 and 4) was used instead of the composite film 4 to prepare a comparative back protection sheet. The heat shrinkage rate of the obtained back protection sheet is also shown in Table 3 similarly.

[0067] [table 3]

[0068]

constitute

Thickness (μm)

Heat shrinkage rate (%)

Example 1

Composite film 6 / moisture barrier / composite film 5

250

0.32

Comparative example 1

Comparative Membrane 4 / Moisture Barrier / Comparative Membrane 2

250

1.29

[0069] As shown ...

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Abstract

Provided is a rear surface protection sheet for a solar cell module. The sheet is composed of a pair of polybutylene terephthalate outer layers (1a, 1a), a three-layer composite film (3a) composed of a polycarbonate core layer (2a) arranged between the outer layers, and a moisture proof layer (4) laminated on the composite film. In the solar cell module, a solar cell element is protected by the protection sheet. The composite film having a three-layer structure is formed by coextrusion.

Description

technical field [0001] The present invention relates to a back protection sheet (sheet) for a solar cell module and a solar cell module having the back protection sheet. Background technique [0002] Solar cells are attracting attention as a clean energy source for reducing the amount of carbon dioxide that is a cause of global warming due to the combustion of fossil fuels, and their use is now being expanded to include in-house power generation and large-scale power generation. [0003] Figure 4 Medium schematically represents the general structure of a solar cell module. A solar cell module 10 constituting a solar cell includes: a surface protection sheet 11 such as glass, a power generating element (including wiring and electrodes) 12, a sealing material 13 for sealing the power generating element 12, a covering and protecting sealing material 13, and the power generating element 12. The back protection sheet 14; in its manufacture, for example, an ethylene-vinyl acetat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/042B32B27/36
CPCH01L31/0487B32B2250/244B32B27/08B32B2307/724B32B27/36Y02E10/50H01L31/048H01L31/049B32B27/18B32B27/22B32B27/365B32B2255/10B32B2255/205B32B2307/21B32B2307/4026B32B2307/712B32B2307/714B32B2307/7265B32B2307/746B32B2457/12Y10T428/269Y10T428/2495Y10T428/31507
Inventor 野口克弘今井直也
Owner OKURA IND
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