CN105514200A - Double-faced electricity-generating double-glass module - Google Patents

Abstract

The invention belongs to the technical field of solar cells, and relates to a double-sided power generation double-glass module, which sequentially includes a front glass, an encapsulation layer, a double-sided power generation battery sheet, an encapsulation layer and a back glass from top to bottom, and the front glass is embossed and tempered Glass, the back glass is coated with a reflective layer, and the reflective layer is coated in the gap between the double-sided power generation cells to form a grid. Beneficial effects: 1. The module itself does not change the structure of the double-glass module, so there is no need to worry about the load of the module itself and the installation of the module; 2. The grid reflective layer of the back glass is evenly distributed, which is not easy to cause hot spot effect; 3. The front of the module Due to the presence of a high reflection layer on the back, the power has a gain of 1.3% compared with ordinary float back glass. Although the back is partly blocked by the grid, the unshielded part still has power generation capacity, and the overall comprehensive efficiency (calculated on the back) 30%) has a certain improvement compared with the ordinary light-transmitting float.

Description

Double-sided power generation double-glass module

technical field

The invention belongs to the technical field of solar cells, in particular to a double-sided power generation double-glass component.

Background technique

At present, most of the existing backplanes and double-glass modules use single-sided polycrystalline or monocrystalline cells. The backplanes of traditional backplane modules have extremely low transmittance, in order to ensure the power generation efficiency of the front side of the cells. With the increasing development of double-glass modules, their own advantages are gradually recognized by people, but the combination of double-glass + polycrystalline cells is indeed a waste of resources.

Defects and deficiencies of the prior art:

1. The existing backplane + glass traditional module, the backplane has the risk of water vapor penetration, which will cause damage to the sealing material and cells in the module, reducing the power generation efficiency and life of the module; and the strength of the traditional module is weak, and the frame needs to be increased To withstand wind and snow loads, it will virtually increase the development cost and bring about the PID phenomenon of the module; in the production, the finished backplane of the backplane module is prone to appearance defects such as bulges; Only single-sided cells can be used for power generation;

2. Most of the existing double-glass modules use single-sided single-polycrystalline cells, and very few also use PTFF with double-sided power generation cells on the back glass. However, due to the existing policy, only the front side power is calculated for double-sided power generation modules, so PTFF The high transmittance leads to the inability to fully utilize the light in the gap, and the use of white EVA and white backplane sacrifices the efficiency of the backside.

Contents of the invention

The purpose of the present invention is to overcome the defect that the double-glass component cannot fully utilize light in the prior art, and provide a double-sided power generation double-glass component.

The technical solution adopted by the present invention to solve the technical problem is: a double-sided power generation double-glass module, which sequentially includes front glass, packaging layer, double-sided power generation cell, packaging layer and back glass from top to bottom. The glass is embossed toughened glass, and the back glass is coated with a reflective layer, and the reflective layer is coated in the gap between the double-sided power generation cells to form a grid.

Further, the thickness of the positive glass is 0.55-3.2mm.

Preferably, the thickness of the positive glass is 2.0 mm.

Preferably, in order to reduce the reflected light on the surface of the front glass and increase the amount of light transmitted, the surface of the front glass is coated with an anti-reflection film.

Further, the thickness of the back glass is 1.6-2.5mm.

Preferably, the thickness of the back glass is 2.0mm.

Further, in order to avoid light leakage from the front of the double-glass module and affect the light conversion rate, the reflective layer extends to the bottom of the double-sided power generation cell, and the area of the reflective layer at the bottom of the double-sided power generation cell is 1% of the area of the double-sided power generation cell. ~9%.

Further, the positive glass surface stress value is greater than 60MPa, and the falling ball test meets the requirements of a 1040g steel ball falling to 60cm, and its warpage, bow, and wave bend should all be within 5 per thousand.

Further, the surface stress value of the back glass is greater than 60MPa, and the falling ball test meets the requirements of a 1040g steel ball falling to 60cm, and its warpage, bow and wave bend should be within 5 per thousand.

Preferably, the encapsulation layer is EVA, PVB, POE or organic silica gel, among which POE is preferred. Compared with the currently used EVA, POE has better thermal stability, optical properties, anti-drying performance, high visible light, ultraviolet light transmittance and lower haze, and also has good flexibility and molding performance, and its low price.

Beneficial effects: 1. The module itself does not change the structure of the double-glass module, so there is no need to worry about the load of the module itself and the installation of the module;

2. The back glass grid reflective layer is evenly distributed, which is not easy to cause hot spot effect;

3. Due to the existence of a high reflection layer on the back of the module, the power of the front side of the module has a gain of 1.3% compared with that of ordinary float back glass. Although the back side is partly blocked by the grid, the unshielded part still has power generation capacity, and the overall comprehensive The efficiency (30% on the back side) has a certain improvement compared with the ordinary light-transmitting float.

Description of drawings

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

Figure 1 is a schematic diagram of the structure of a double-sided power generation double-glass module;

Figure 2 is a schematic diagram of the back glass structure;

Fig. 3 is a schematic diagram of the cooperation structure of the back glass and the double-sided power generation cells.

Among them: 1. Front glass, 2. Encapsulation layer, 3. Double-sided power generation cell, 4. Back glass, 41. Reflective layer.

detailed description

Example 1

As shown in Figures 1 and 2, a double-sided power generation double-glass module includes a front glass 1, an encapsulation layer 2, a double-sided power generation cell sheet 3, an encapsulation layer 2, and a back glass 4 from top to bottom. The glass 1 is embossed tempered glass, and the back glass 4 is coated with a reflective layer 41, and the reflective layer 41 is coated in the gap between the double-sided power generation cells 3 to form a grid. The thickness of the front glass 1 is 2.0mm, and the surface of the front glass 1 is coated with an antireflection film; the thickness of the back glass 4 is 2.0mm, as shown in Figure 3, the reflective layer 41 extends to The area of the reflective layer 41 located at the bottom of the double-sided power generation cell 3 is 1-9% of the area of the double-side power generation cell 3 . In this application, POE is used as the material of the packaging layer 2. Two layers of POE are laid between the positive glass 1 and the double-sided power generation cell 3. The junction of the bus bar and the interconnection bar of the cell is thicker, which will break the positive glass 1, and The use of two layers of encapsulation layer 2 between the positive glass 1 and the cell has good buffer performance and can effectively prevent the positive glass 1 from breaking.

Among them, embossed tempered glass is a light-transmitting decorative flat glass with concave and convex patterns on one or both sides. Embossed glass usually uses a special flower roller to press special patterns on the surface of the glass, such as pyramid patterns, honeycombs, and rhombuses. etc., through the special embossed pattern design to reduce the directional reflection of the glass, increase the internal reflection effect, promote its effective absorption of solar energy, greatly increase the transmittance of sunlight, and improve the power generation efficiency.

The surface stress value of the positive glass 1 mentioned therein should be greater than 60MPa, and the falling ball test meets the requirements of a 1040g steel ball falling to 60cm, and its warpage, bow and wave bend should be within 5/1000; the surface of the back glass 4 mentioned The stress value is greater than 60MPa, and the falling ball test meets the requirements of a 1040g steel ball falling to 60cm, and its warpage, bow bend, and wave bend should all be within 5 per thousand.

The encapsulation layer 2 POE needs to have a cross-linking degree between 75% and 90%, the glass strength and tensile force should be more than 100N, and the lamination process needs to realize that the battery strings do not have pressure measurement problems such as parallel strings, string expansion, and air bubbles. The encapsulation layer 2 material itself UV aging 60kw*h/m ² , TC200 and DH1000 tests are also required.

The specific lamination parameters are shown in the table below:

Measured efficiency comparison:

The actual production of the components uses cells produced by MEGA. The front glass 1 is made of anti-reflection coated embossed tempered glass, and the back glass 4 is made of ordinary float tempered glass and tempered glass coated with a grid-like reflective film. , using the same stringing method, comparing the two sets of data in the table below, it is not difficult to see that the back glass 4 adopts the module coated with grid-shaped reflective film, and the front power of the back glass 4 adopts ordinary float tempered glass. 3.649W, but the power of the back is reduced by 7.433W. Since the proportion of the back is small, it is mostly based on the final comprehensive view. Back glass 4 adopts components coated with a grid-like reflective film than back glass 4 adopts ordinary float tempering. The comprehensive efficiency of the glass module is increased by 1.419W. (The following power is tested according to the specification of IEC61215).

Among them, comprehensive efficiency = power (positive) + 30% power (back).

Example 2

In Example 1, the front glass 1 is replaced with anti-reflection coated embossed tempered glass with a thickness of 0.2 mm, and the back glass 4 is replaced with tempered glass with a thickness of 2.5 mm. Other structures are with embodiment 1.

After testing, under the same conditions (positive glass 1, double-sided power generation cells 3, and packaging materials are the same), the overall efficiency of the double-glass module coated with grid-shaped reflective layer back glass 4 is higher than that of ordinary float back glass without reflective layer The comprehensive power gain of 4 double-glass modules is 1.512W.

Example 3

In Example 1, the front glass 1 is replaced with anti-reflection coated embossed tempered glass with a thickness of 3.2 mm, and the back glass 4 is replaced with tempered glass with a thickness of 1.6 mm. Other structures are with embodiment 1.

After testing, under the same conditions (positive glass 1, double-sided power generation cells 3, and packaging materials are the same), the overall efficiency of the double-glass module coated with grid-shaped reflective layer back glass 4 is higher than that of ordinary float back glass without reflective layer The comprehensive power gain of 4 double-glass modules is 1.455W.

It should be understood that the specific embodiments described above are only used to explain the present invention, not to limit the present invention. Obvious changes or variations derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (10)

1. A double-sided power generation double-glass module, characterized in that: from top to bottom, it includes front glass (1), encapsulation layer (2), double-sided power generation cell (3), encapsulation layer (2) and back glass (4), the front glass (1) is embossed tempered glass, the back glass (4) is coated with a reflective layer (41), and the reflective layer (41) is coated on the double-sided power generation cell In the gap between the sheets (3), a grid shape is formed. 2. The double-sided power generation double-glass module according to claim 1, characterized in that: the thickness of the front glass (1) is 0.55-3.2mm. 3. The double-sided power generation double-glass module according to claim 2, characterized in that: the thickness of the front glass (1) is 2.0mm. 4. The double-sided power generation double-glass module according to claim 1 or 2, characterized in that: the surface of the front glass (1) is coated with an anti-reflection film. 5. The double-sided power generation double-glass module according to claim 1 or 2, characterized in that the thickness of the back glass (4) is 1.6-2.5mm. 6. The double-sided power generation double-glass module according to claim 5, characterized in that: the thickness of the back glass (4) is 2.0mm. 7. The double-sided power generation double-glass module according to claim 1, characterized in that: the reflective layer (41) extends to the bottom of the double-sided power generation cell (3), and is located at the bottom of the double-sided power generation cell (3) The area of the reflective layer (41) is 1-9% of the area of the double-sided power generation battery sheet (3). 8. The double-sided power generation double-glass module according to claim 1, characterized in that: the surface stress value of the positive glass (1) is greater than 60MPa, and the falling ball test meets the requirements of a 1040g steel ball falling to 60cm, and its warpage, bow Bends and wave bends should be within 5 per thousand. 9. The double-sided power generation double-glass module according to claim 1, characterized in that: the surface stress value of the back glass (4) is greater than 60MPa, and the falling ball test meets the requirements of a 1040g steel ball falling to 60cm, and its warpage, bow Bends and wave bends should be within 5 per thousand. 10. The double-sided power generation double-glass module according to claim 1, characterized in that: the encapsulation layer (2) is EVA, PVB, POE or organic silica gel.