CN207503990U - A double-sided double-glass photovoltaic module glass backplane and a double-sided double-glass photovoltaic module - Google Patents

Abstract

The utility model discloses a two-sided double-glass photovoltaic module glass backplate and two-sided double-glass photovoltaic module, the glass backplate, including the glass plate body, the glass plate body is including the battery composing region who is used for composing photovoltaic cell, its characterized in that, the material of glass plate body is super white glass, the battery composing region includes a plurality of battery pieces regions that correspond respectively with every battery piece among the photovoltaic cell and is located the battery piece clearance region between the battery piece, the battery piece is pressed in the region has the decorative pattern structure, the regional no decorative pattern structure in battery piece clearance. The utility model discloses well double-sided double-glass photovoltaic module load and mechanical properties itself can not change, and the battery piece clearance region of glass backplate levels and does not have the decorative pattern for improve with packaging material adhesive property behind this regional screen printing coating. And the reflective coating is printed in the gap area of the cell of the glass backboard by screen printing, so that the light penetrating through the gap area of the cell can be fully utilized, and the power of the assembly is improved.

Description

A double-sided double-glass photovoltaic module glass backplane and a double-sided double-glass photovoltaic module

technical field

The utility model belongs to the technical field of solar energy, in particular to a double-sided double-glass photovoltaic module glass back plate and a double-sided double-glass photovoltaic module.

Background technique

As a low-carbon renewable energy source, the solar energy industry is booming around the world, and the installations in various countries are increasing year by year. At present, there are many cases of installing photovoltaic systems on the ground and on various types of roofs. For various types of buildings, the installation of photovoltaic products with power generation function can reduce the energy consumption of buildings, achieve the effect of energy saving and emission reduction, and also bring economic benefits to building owners and system installers and users, so it is very valuable for promotion.

Photovoltaic modules are composed of 5 layers of front sheet, EVA, solar cells, EVA and back sheet from top to bottom. At present, the back glass of existing photovoltaic modules mostly adopts ordinary float tempered glass. For example, the patent document with publication number CN 106601842 A discloses a low-power-loss double-glass module. The double-glass module is sequentially provided with ultra-clear embossed tempered glass, a first EVA film layer, and a battery sheet from top to bottom. , the second EVA film layer, and float glass; the back of the float glass is coated with a layer of milky white high-temperature glaze, and the thickness of the high-temperature glaze is 300-500 microns. With the increasing development of double-sided battery technology, double-sided double-glass is gradually recognized by the market. Since both sides of double-sided double-glass can generate electricity, ultra-clear glass must be used for the back glass. However, white EVA cannot be used for double-sided double-glass. The light in the gap between the cells cannot be fully utilized, and it is easy to cause power loss in double-glass photovoltaic modules. As a result, screen-printed white glass appears, but when screen-printed on ultra-clear embossed glass, the reflective paint cannot fully fill the pattern, so the The reliability of double-glass modules brings hidden dangers.

Utility model content

In order to solve the above problems, the utility model provides a double-sided double-glass photovoltaic module glass backplane, which makes full use of light energy and reduces the loss rate of photovoltaic module power.

The technical solution of the utility model is: a double-sided double-glass photovoltaic module glass backplane, including a glass plate body, the glass plate body includes a cell typesetting area for typesetting photovoltaic cells, and the material of the glass plate body is super White glass, the cell typesetting area includes a plurality of cell areas corresponding to each cell in the photovoltaic cell and the cell gap area between the cells, the cell area is embossed with a pattern structure, the There is no pattern structure in the cell gap area.

In the utility model, there is no pattern structure in the gap area of the battery sheet, which can facilitate subsequent screen printing.

There are various pattern structures in the present invention, preferably, the shape of the pattern structure is pyramid shape, honeycomb shape or rhombus shape.

Preferably, the glass plate has a thickness of 0.5-3.2 mm.

Preferably, it also includes a reflective coating screen-printed on the glass plate. Screen-printing reflective coating on the cell gap area can make full use of the light passing through the cell gap area and improve the power of the module.

The raw material of the reflective coating in the present invention can be selected from a variety of materials, preferably, the raw material of the reflective coating is low-temperature glaze or modified TiO ₂ .

The utility model also provides a double-sided double-glass photovoltaic module, including a front plate, a first packaging material layer, a double-sided battery, a second packaging material layer and a back plate arranged in sequence from top to bottom, and the back plate is The above-mentioned double-sided double-glass photovoltaic module glass backplane.

Preferably, the material of the first packaging material layer and the second packaging material layer is POE, EVA, PVB or organic silica gel.

Preferably, the double-sided cell is an N-type photovoltaic cell, a P-type photovoltaic cell, an IBC photovoltaic cell or an HJT photovoltaic cell.

Preferably, the material of the front plate is ultra-clear embossed coated glass or ultra-clear float glass.

Compared with the prior art, the beneficial effects of the utility model are reflected in:

In the utility model, the load and mechanical properties of the double-sided double-glass photovoltaic module itself will not change, and the cell gap area of the glass back plate is flat and free of patterns, so that the bonding performance between the screen printing paint and the packaging material in this area is improved. In addition, the reflective coating is screen-printed in the gap area of the cell on the glass back plate, which can make full use of the light passing through the gap area of the cell and improve the power of the module.

Description of drawings

Fig. 1 is a schematic structural diagram of a double-sided double-glass photovoltaic module of the present invention.

Fig. 2 is a schematic structural view of the backboard of the present invention.

Detailed ways

Example 1

As shown in FIG. 1 , the utility model includes a front plate 1 , a first encapsulation material layer 2 , a double-sided battery 3 , a second encapsulation material layer 4 and a back plate 5 arranged sequentially from top to bottom. The materials of the first encapsulation material layer 2 and the second encapsulation material layer 4 are POE, EVA, PVB or organic silica gel, and the double-sided battery 3 is an N-type photovoltaic cell, a P-type photovoltaic cell, an IBC photovoltaic cell or an HJT photovoltaic cell.

Wherein, as shown in FIG. 2 , the back plate 5 of the present invention includes a glass plate body, and generally, the thickness of the glass plate body is 0.5-3.2 mm. The glass plate body includes a cell typesetting area for typesetting photovoltaic cells, and the material of the glass plate body is ultra-clear glass, preferably ultra-clear embossed glass. The cell layout area includes a plurality of cell areas 51 corresponding to each cell in the photovoltaic cell and a cell gap area 52 between the cells. The cell area 51 is pressed with a pattern structure, and the cell gap area 52 has no pattern structure.

In the utility model, there is no pattern structure in the cell gap area 52, which can facilitate subsequent screen printing. And there are many kinds of pattern structures in the present invention, for example, the shape of the pattern structure can be a pyramid shape, a honeycomb shape or a rhombus shape.

A reflective coating is also screen-printed on the glass plate. Screen-printing reflective coating on the cell gap area 52 can make full use of the light passing through the cell gap area 52 and improve module power. The raw material of the reflective coating in the utility model can be selected from many kinds, for example, the raw material of the reflective coating can be low-temperature glaze or modified TiO2.

In this embodiment, the battery sheet uses the double-sided battery 3 produced by Trina Solar, the packaging material of the first packaging material layer 2 and the second packaging layer uses POE, the front panel 1 is 2.5mm ultra-clear embossed coated glass, and the back panel 5 is 2.5mm ultra-clear embossed glass, the pattern structure is honeycomb. Battery module spacing: the spacing between battery slices is 2.5mm, and the spacing between battery strings is 3.5mm. When screen-printing white low-temperature glaze on the glass body of the back plate 5 for tempering treatment, the reflectivity is >85%, and the pull-off force between the cell gap area 52 and POE after screen printing and tempering is 215N/cm, and the cell area The pull-off force of 51 screen printing and POE after tempering is 203N/cm. Compared with the screen printing of the cell gap region 52 and the cell region 51 , the bonding performance between the cell gap region 52 and the encapsulation material is higher after the paint is screen-printed.

Example 2

In this comparative example, the back plate adopts 2.5mm rear ultra-clear patterned glass without a reflective layer, adopts the same series connection method and lamination process, and the rest of the structure is the same as that of Example 1.

It can be seen from the power data in Table 1 that the front power of Embodiment 1 is increased by 4.85W compared with Embodiment 2, and the power generation gain of the back is calculated as 20%, and the power of the back is reduced by 2.64W. In Embodiment 1, the front power gain is 4.85W. Rear power gain -2.64W, overall gain 2.21W. (The power test is standardized in the STC environment required by IEC61215)

Table 1

Front power/W Back power/W Example 1 296.95 216.46 Example 2 292.10 219.10

Example 3

In Example 1, the front plate is replaced with ultra-clear float glass with a thickness of 2.0 mm, and the back plate is replaced with ultra-clear embossed glass with a thickness of 2.0 mm. The screen-printed reflective coating in the flat pattern area is modified TiO ₂ , and the reflectivity after tempering is >80%. Other structures are the same as in Example 1.

After testing, under the same conditions, the overall gain of the component obtained by using the screen-printed reflective coating on the back plate is 2.05W higher than that of the transparent double-sided component.

Claims (9)

1. A double-sided double-glass photovoltaic module glass backplane, comprising a glass plate body, the glass plate body comprising a cell typesetting area for typesetting photovoltaic cells, characterized in that the material of the glass plate body is ultra-clear glass , the battery typesetting area includes a plurality of battery sheet areas corresponding to each battery sheet in the photovoltaic cell and a battery sheet gap area between the battery sheets, a pattern structure is pressed in the battery sheet area, and the battery sheet There is no textured structure in the gap area. 2 . The double-sided double-glass photovoltaic module glass backplane according to claim 1 , wherein the shape of the textured structure is a pyramid shape, a honeycomb shape or a rhombus shape. 3 . The double-sided double-glass photovoltaic module glass backplane according to claim 1 , wherein the thickness of the glass plate is 0.5-3.2 mm. 4. The double-sided double-glass photovoltaic module glass backsheet according to any one of claims 1-3, further comprising a reflective coating screen-printed on the glass plate. 5 . The double-sided double-glass photovoltaic module glass backplane according to claim 4 , wherein the raw material of the reflective coating is low-temperature glaze or modified TiO ₂ . 6. A double-sided double-glass photovoltaic module, comprising a front plate, a first encapsulation material layer, a double-sided battery, a second encapsulation material layer and a back plate arranged in sequence from top to bottom, wherein the back plate is The double-sided double-glass photovoltaic module glass backplane described in any one of claims 1-5. 7. The double-sided double-glass photovoltaic module according to claim 6, wherein the material of the first encapsulation material layer and the second encapsulation material layer is POE, EVA, PVB or organic silica gel. 8. The double-sided double-glass photovoltaic module according to claim 6 or 7, wherein the double-sided cells are N-type photovoltaic cells, P-type photovoltaic cells, IBC photovoltaic cells or HJT photovoltaic cells. 9. The double-sided double-glass photovoltaic module according to claim 6, wherein the material of the front plate is ultra-clear embossed coated glass or ultra-clear float glass.