CN102522441A - Pyramidal laminated tempered glass with gradually changed refractive indexes - Google Patents

Abstract

The invention relates to the technical field of encapsulation materials for solar cell modules, in particular to a laminated tempered glass with a pyramidal structure with a gradually changing refractive index, which has multiple layers of glass, and the refractive index of the surface glass to the bottom glass is N1, N2, ...Nn, and N1<N2<...<Nn, light-trapping structures are provided on adjacent surfaces between the glass layers, and the glass layers are filled and bonded by an adhesive layer. The light-trapping structures arranged on adjacent surfaces between the glass layers are matched with each other. The light trapping structure is a pyramid light trapping structure. The beneficial effects of the present invention are: the gradient index laminated glass structure enables the light reflected from the lower surface of the laminated glass and the surface of the cell to return to the cell through total reflection for better absorption; the pyramid light trapping structure makes the laminated glass The light reflected from the surface has a certain chance to change the light path and enter the interior of the glass and the surface of the cell. Effectively reduce the reflectivity of the front tempered glass encapsulation layer, so that more light can reach the battery sheet and improve the efficiency of the battery module.

Description

Laminated tempered glass with pyramidal structure and graded refractive index

technical field

The invention relates to the technical field of encapsulation materials for solar cell modules, in particular to a laminated tempered glass with a pyramidal structure and a graded refractive index.

Background technique

At present, the front side packaging of solar cell modules generally uses single-layer tempered glass with smooth sides as the packaging material. Such a structure is not conducive to reducing the reflectivity of the overall component, and part of the light will be reflected from the battery sheet through the tempered glass back to the air, which cannot be effectively used.

Contents of the invention

The technical problem to be solved by the present invention is to provide a laminated tempered glass with a pyramidal structure with a gradually changing refractive index, so as to reduce the overall reflectivity of the solar cell module.

The technical solution adopted by the present invention to solve the technical problem is: a laminated tempered glass with a pyramidal structure with a gradually changing refractive index, which has multiple layers of glass, and the refractive index of the surface glass to the bottom glass is N1, N2, ... Nn, and N1<N2<...<Nn, light-trapping structures are provided on adjacent surfaces between the glass layers, and the glass layers are filled and bonded by an adhesive layer.

The light-trapping structures arranged on adjacent surfaces between the glass layers are matched with each other.

The light-trapping structure is a pyramidal light-trapping structure processed on the surface of the glass, and the pyramidal light-trapping structure on the lower surface of the upper glass matches with the pyramidal light-trapping structure on the upper surface of the lower glass.

A neutral silicone resin glue with a refractive index close to that of the upper glass is used as a bonding layer between the glass layers.

The lower surface of the bottom glass adjacent to the battery sheet is provided with a pyramid light-trapping structure, and the gap between the bottom glass and the battery sheet is filled with a neutral silicone resin glue whose refractive index is close to that of the bottom glass.

The laminated tempered glass has three layers of tempered glass, the first layer uses phosphate tempered glass, the second layer uses ordinary tempered glass, and the third layer uses borate tempered glass, and the refractive index of the three layers of glass changes uniformly.

The pyramid light trapping structure is made by laser slotting process.

The beneficial effects of the present invention are: the graded-index laminated glass structure enables the light reflected from the lower surface of the laminated glass and the surface of the cell to return to the cell through total reflection for better absorption; The light reflected by the surface has a certain chance to change the light path and enter the interior of the glass and the surface of the cell. Effectively reduce the reflectivity of the front tempered glass encapsulation layer, so that more light can reach the battery sheet and improve the efficiency of the battery module.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of the principle of the present invention;

Fig. 2 is a structural representation of the present invention;

In the figure, 1. Pyramid light-trapping structure, 2. Neutral silicone resin glue, 3. Phosphate tempered glass, 4. Ordinary tempered glass, 5. Borate tempered glass, 6. Battery sheet, 7. Back packaging.

Detailed ways

A kind of laminated tempered glass with pyramidal structure and gradient refractive index, which has multiple layers of glass. The refractive index of the surface glass to the bottom glass is N1, N2,...Nn in sequence, and N1<N2<...<Nn, the glass layer There are light-trapping structures on the adjacent surfaces, and the light-trapping structures match each other. The light-trapping structure is a pyramidal light-trapping structure 1 processed on the surface of the glass, and the pyramidal light-trapping structure 1 on the lower surface of the upper glass is connected to the lower glass. The pyramidal light-trapping structures 1 on the surface match each other. The glass layers are filled and bonded by the adhesive layer, and the neutral silicone resin glue 2 with a refractive index close to that of the upper glass is used as the adhesive layer between the glass layers. The lower surface of the bottom glass adjacent to the battery sheet 6 is provided with a pyramidal light-trapping structure 1, and the space between the bottom glass and the battery sheet 6 is filled with a neutral silicone resin glue 2 having a refractive index close to that of the bottom glass. Pyramid light-trapping structure 1 is made by laser slotting process to ensure that pyramid light-trapping structure 1 between upper and lower layers of glass can fit well.

Replacing the single-layer glass used for the front-side packaging of the solar cell module with the multi-layer glass with a gradient refractive index and a pyramidal light-trapping structure of this solution can make rational use of the total reflection phenomenon and effectively reduce the light reflected from the surface of the solar cell 6 back to the air Quantity, so that more light energy is absorbed. The reasons are: 1. The multi-layer glass lamination makes the total reflection phenomenon more likely to occur. It can be seen from Figure 1 that even if the incident angle θi1 of the first layer of light is smaller than the critical angle θc1, due to refraction after entering the second layer of glass, the incident angle θi2 at the interface of the second layer becomes larger, and there is A certain possibility is greater than the critical angle θc2, so that the light transmitted without total reflection is still reflected back. Reasonably adjust the refractive index and thickness of each layer of glass. The specific principle is that the difference between the refractive index of the bottom layer glass and the refractive index of air is as large as possible, so that the ratio of the refractive index can be reduced, thereby reducing the critical angle θc and increasing the occurrence of total reflection. probability; the refractive index difference between each layer of glass changes as evenly as possible, such a configuration can make the light reflected from the surface of the battery sheet 6 be totally reflected at the interface of each glass, thereby reducing the reflection of the tempered glass encapsulation layer Rate. 2. Except that the front surface of the first layer of glass is smooth, the fronts of each layer of glass are processed into a pyramid light-trapping structure of the same size 1; and the lower surface of the upper glass is processed to match the pyramid light-trapping structure of the lower glass Pyramid light trapping structure 1 . Such a light trapping structure can reduce the reflection of light at the interface between the glass layers. 3. The glass layers are bonded with neutral silicone resin glue 2 with a refractive index close to that of the upper glass layer; among them, the inverted pyramid light-trapping structure 1 on the back of the glass layer adjacent to the battery sheet 6 needs to use neutral silicone resin glue 2 is filled, otherwise if there is air in the middle, the incident light will be totally reflected at this interface.

As shown in Figure 2, the laminated tempered glass with a gradient refractive index of the pyramid structure has three layers of tempered glass, the first layer is made of phosphate tempered glass 3, the second layer is made of ordinary tempered glass 4, and the third layer is made of borate Tempered glass 5, the refractive index of the three layers of glass changes evenly. The concentration of phosphate and borate is properly adjusted to meet the condition of uniform change in the refractive index of the three-layer glass, and the influence of salts on the light transmittance of the glass must be considered. The pyramid light-trapping structure 1 is manufactured by laser slotting process, and the back of the battery sheet 6 is the back package 7 .

Claims (7)

1. the laminated toughened glass of a pyramid structure gradually changed refractive index; It is characterized in that: have compound glass; The refractive index of the refractive index of the glass on top layer to bottom glass be followed successively by N1, N2 ... Nn; And N1＜N2＜...＜Nn is provided with light trapping structure on the adjacent surface between the glassy layer, fill, bond through tack coat between the glassy layer.

2. according to the laminated toughened glass of the pyramid structure gradually changed refractive index shown in the claim 1, it is characterized in that: the light trapping structure that is provided with on the adjacent surface between the described glassy layer agrees with each other.

3. according to the laminated toughened glass of the pyramid structure gradually changed refractive index shown in the claim 2; It is characterized in that: the pyramid light trapping structure (1) of described light trapping structure for processing at surface layer of glass, the pyramid light trapping structure (1) of upper strata lower glass surface agrees with the pyramid light trapping structure (1) on lower floor surface on glass each other.

4. according to the laminated toughened glass of the pyramid structure gradually changed refractive index shown in claim 1 or 2 or 3, it is characterized in that: use between the described glassy layer with the approaching neutral silicone resin glue (2) of upper strata glass refraction as tack coat.

5. according to the laminated toughened glass of the pyramid structure gradually changed refractive index shown in the claim 4; It is characterized in that: the lower surface of the described bottom glass adjacent with battery sheet (6) is provided with pyramid light trapping structure (1), between bottom glass and the battery sheet (6) through filling up with the approaching neutral silicone resin glue (2) of bottom glass refraction.

6. according to the laminated toughened glass of the pyramid structure gradually changed refractive index shown in the claim 5; It is characterized in that: have compound steel glass; Ground floor uses phosphate toughened glass (3); The second layer uses common toughened glass (4), and the 3rd layer is used borate toughened glass (5), triplex glass refractive index even variation.

7. according to the laminated toughened glass of the pyramid structure gradually changed refractive index shown in the claim 5, it is characterized in that: described pyramid light trapping structure (1) uses lbg technology to make.

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