CN102867868B

CN102867868B - Solar cell back plate structure

Info

Publication number: CN102867868B
Application number: CN201110188759.3A
Authority: CN
Inventors: 林志铭; 李建辉; 张孟浩
Original assignee: Asia Electronic Material Co Ltd
Current assignee: Asia Electronic Material Co Ltd
Priority date: 2011-07-07
Filing date: 2011-07-07
Publication date: 2015-07-22
Anticipated expiration: 2031-07-07
Also published as: CN102867868A

Abstract

The invention discloses a solar cell back plate structure which is provided with a core layer, a first adhesive layer, a second adhesive layer, an inner coating layer and an outer coating layer. The inner coating layer is adhered on the upper surface of the core layer through the first adhesive layer, the outer coating layer is adhered on the lower surface of the core layer through the second adhesive layer, and both the inner coating layer and the outer coating layer are composite films made of polyimide and Teflon. Water vapor is effectively stopped by the outer coating layer which is the composite film made of the polyimide and the Teflon, and the inner coating layer is positioned on the inner side and attached on a solar cell or a solar cell module, so that the water vapor stopping effect is further improved. Besides, the composite films made of the polyimide and the Teflon have weather resistance, so that the solar cell back plate structure has an excellent water vapor prevention effect and weather resistance or machining resistance.

Description

Solar cell backboard structure

Technical field

The invention belongs to area of solar cell, relate generally to a kind of solar cell backboard with the composite membrane be made up of polyimides and Teflon.

Background technology

Along with the development of human civilization, the whole world faces the problems such as serious energy crisis and environmental pollution.Wherein, solar energy directly can be transformed into the photovoltaic solar cell of electric energy as solving one of worldwide energy crisis and the important method reducing environmental pollution.The module that solar cell is formed is arranged at open air usually, in order to avoid the factor such as aqueous vapor, high temperature of outdoor environment undermines solar module, such as aqueous vapor through corrosion circuits etc., therefore, particularly require solar cell backboard to have weatherability and vapor transmission rate is little.

Conventional solar cell back board structure, mainly at the fluoro-containing copolymer film (Tedlar) that the upper and lower surface laminating E.I.Du Pont Company of polyethylene terephthalate layer sells.In No. 201041150 Taiwan Patent, disclose a kind of solar cell backboard structure of improvement, as shown in Figure 2, the primer layer 20 that described solar cell backboard structure comprises conductor watertight composition 24, the second insulating barrier 26 being formed at described conductor watertight composition 24 upper and lower surface respectively and the first insulating barrier 22, is formed at the weathering layer 28 on described second insulating barrier 26 and is formed on described first insulating barrier 22, described Taiwan Patent is that the second insulating barrier 26 of polyethylene terephthalate and weathering layer 28 solve the problem that pin hole runs through and electric arc runs through by material.But in weatherability, uv-resistance and anti-aqueous vapor, effect is still not enough using polyethylene terephthalate as weathering layer 48.

Therefore, a kind of solar cell backboard structure with excellent anti-aqueous vapor effect is still needed.

Summary of the invention

In order to overcome above-mentioned defect, the invention provides a kind of solar cell backboard structure, described solar cell backboard structure has excellent anti-aqueous vapor effect and weatherability or resist processing.

The present invention in order to the technical scheme solving its technical problem and adopt is:

A kind of solar cell backboard structure, be provided with core layer, the first adhesion agent layer, the second adhesion agent layer, internal coated layer and outer covering layer, described internal coated layer and described outer covering layer are all the composite membrane be made up of polyimides and Teflon, described core layer has relative upper and lower surface, described internal coated layer adheres to described core layer upper surface by the first adhesion agent layer, and described outer covering layer adheres to described core layer lower surface by the second adhesion agent layer.

Further technical scheme of the present invention is:

The described composite membrane be made up of polyimides and Teflon can be fitted by polyimide film and Teflon film formed, and the Teflon film of described internal coated layer is positioned at polyimide film upper surface, and the Teflon film of described outer covering layer is positioned at polyimide film lower surface.The thickness of described polyimide film and Teflon film is all 12 to 50 microns.

The described composite membrane be made up of polyimides and Teflon also can be the co-extruded films of polyimides and Teflon.

Described core layer is polymer material layer, preferably polyethylene terephthalate layer.

The thickness of described core layer is 75 to 275 microns.

The thickness of described internal coated layer is 24 to 100 microns.

The thickness of described outer covering layer is 24 to 100 microns.

Preferably described internal coated layer is identical with described outer covering layer thickness.

The invention has the beneficial effects as follows: the present invention utilizes the composite membrane be made up of polyimides and Teflon as outer covering layer, effectively to intercept aqueous vapor, and the composite membrane be made up of polyimides and Teflon is positioned at inner side as internal coated layer and is attached on solar cell or solar module, to promote moisture obstruction further, in addition, the composite membrane be made up of polyimides and Teflon also has weather resistance, and therefore solar cell backboard structure of the present invention has excellent anti-aqueous vapor effect and weatherability or resist processing.

Accompanying drawing explanation

Figure 1A and Figure 1B is solar cell backboard structural representation of the present invention, and wherein, Figure 1B is for illustrating that internal coated layer and outer covering layer are formed for being fitted by polyimide film and Teflon film;

Fig. 2 is the solar cell backboard structure of No. 201041150 Taiwan Patent;

Description of reference numerals

10 core layers

10a core layer upper surface

10b core layer lower surface

11a first adhesion agent layer

11b second adhesion agent layer

12 internal coated layers

12a polyimide film

12b Teflon film

13 outer covering layers

13a polyimide film

13b Teflon film

20 primer layers

22 first insulating barriers

24 conductor watertight compositions

26 second insulating barriers

28 weathering layers.

Embodiment

Embodiment: a kind of solar cell backboard structure, as illustrated in figures ia and ib, there is core layer 10, first adhesion agent layer 11a, the second adhesion agent layer 11b, internal coated layer 12 and outer covering layer 13, described internal coated layer 12 and described outer covering layer 13 are all the composite membrane be made up of polyimides and Teflon, described core layer 10 has relative upper and lower surperficial 10a, 10b, described internal coated layer 12 adheres to described core layer upper surface 10a by the first adhesion agent layer 11a, and described outer covering layer 13 adheres to described core layer lower surface 10b by the second adhesion agent layer 11b.

Solar cell backboard structure preparation process of the present invention is as follows: mainly preparing a material is such as core layer 10 that polyethylene terephthalate and thickness are 75 to 275 microns, thereon, lower surface 10a, 10b be internal coated layer 12 and the outer covering layer 13 of 24 to 100 microns by material as the first adhesion agent layer 11a of epoxy resin and the second adhesion agent layer 11b bond thickness separately, can obtain solar cell backboard structure of the present invention.Preferably internal coated layer is identical with the thickness of outer covering layer, to maintain the very property of solar cell backboard structure.

First adhesion agent layer 11a of the present invention and the second adhesion agent layer 11b can be black or white person, such as, containing additives such as carbon black, titanium dioxide or pigment.

The present embodiment is stressed that, internal coated layer 12 and outer covering layer 13 are the composite membrane be made up of polyimides and Teflon, the co-extruded films of such as polyimides and Teflon, or as shown in Figure 1B, outer covering layer 13 by thickness separately by 12 to 30 polyimide film 13a and Teflon film 13b fit and formed, internal coated layer 12 is made up of by the polyimide film 12a of 12 microns to 50 microns and Teflon film 12b fits separately thickness, when using the composite membrane be made up of polyimides and Teflon, the adhesion strength with adhesion agent layer can be promoted by polyimides, such as, adhesion strength between first adhesion agent layer 11a and internal coated layer 12, and second adhesion strength between adhesion agent layer 11b and outer covering layer 13.

Teflon of the present invention, refer to fluorine-containing polymer, such as, polyvinyl fluoride (Polyvinyl fluoride, PVF), Kynoar (Polyvinylidenefluoride, PVDF), polytrifluorochloroethylene (Polychlorotrifluorethylene, PCTFE), polytetrafluoroethylene (polytetrafluorethylene, or the copolymer of tetrafluoroethene and ethene (ETFE) PTFE), and be good with the copolymer of polytetrafluoroethylene and tetrafluoroethene and ethene, promote moisture obstruction with this.

The first adhesion agent layer in the present invention and the thickness of the second adhesion agent layer are 10 to 50 microns separately.

Test case: according to ASTM F-1249, carry out the test of aqueous vapor penetrance, and result is embedded in table 1.

Polyethylene terephthalate (PET): adopt Xinguang Synthetic Fibre Co. Ltd.'s polyester film, G281

Epoxy resin: adopt epoxy resin prepared by Asia electricity material, AEM-V1

Polyimides (PI): SKC Kolon, FEP

Polytetrafluoroethylene (PTFE): Dupont Kapton, FN PI film

Table 1:

The aqueous vapor penetrance of conventional solar cell backboard is generally large about 1.8g/m ²more than-sky, solar cell backboard structure of the present invention can reduce aqueous vapor penetrance significantly to 1.1g/m ²-sky, has excellent anti-aqueous vapor effect.

In No. 201041150 Taiwan Patent, material core is aluminium sheet, but skin is PET material, through environmental change, not weather change, not there is uv-resistance, do not have the effect such as waterproof and choke, compared to this, the present invention uses the composite membrane weatherability containing Teflon very excellent, and tool uv-resistant characteristic, very good to the air choke effect that blocks water, can long-term storage in atmospheric environment, cracking change can not be produced.

Claims

1. a solar cell backboard structure, it is characterized in that: be provided with core layer, first adhesion agent layer, second adhesion agent layer, internal coated layer and outer covering layer, described internal coated layer and described outer covering layer are all the composite membrane be made up of polyimides and Teflon, described core layer has relative upper, lower surface, described internal coated layer adheres to described core layer upper surface by the first adhesion agent layer, described outer covering layer adheres to described core layer lower surface by the second adhesion agent layer, described Teflon is the copolymer of polytetrafluoroethylene or tetrafluoroethene and ethene, described core layer is polyethylene terephthalate layer, the thickness of described core layer is 75 to 275 microns, described internal coated layer is identical with described outer covering layer thickness and be all 24 to 100 microns, the described composite membrane be made up of polyimides and Teflon is the one in following two kinds of structures:

One, the described composite membrane be made up of polyimides and Teflon is fitted by polyimide film and Teflon film formed, the Teflon film of described internal coated layer is positioned at polyimide film upper surface, the Teflon film of described outer covering layer is positioned at polyimide film lower surface, and the thickness of described polyimide film and Teflon film is all 12 to 50 microns;

Two, the described composite membrane be made up of polyimides and Teflon is the co-extruded films of polyimides and Teflon.