CN108133969A - A kind of reflective pad pasting of photovoltaic anti-dazzle synergy and photovoltaic cell component - Google Patents

Abstract

The invention provides a photovoltaic anti-glare synergistic reflective film, comprising: a microstructure layer, a reflective layer with reflective properties, a base material layer and a hot-melt adhesive layer, the microstructure layer is arranged on the base material layer, and the microstructure layer is composed of multiple Composed of strip unit structures, the unit structure extends along the longitudinal direction of the substrate layer, the top curve and bottom width of the unit structure change periodically, or the top curve and bottom curve of the unit structure change periodically, and the two kinds of periodic changes present continuous smooth curves , the reflective layer is attached to the microstructure layer, and the hot melt adhesive layer is disposed on the reflective layer or disposed under the substrate layer. By changing the design of the microstructure layer, the photovoltaic anti-glare synergistic reflective film expands the reflection range of light and improves the light utilization rate; the silane coupling agent and heat-resistant resin are introduced into the hot-melt adhesive layer to increase the adhesion to glass. The bonding force improves the temperature resistance of the hot melt adhesive; the reflective film is pasted on the glass wool surface, which is convenient for automatic and stable production.

Description

Photovoltaic anti-glare synergistic reflective film and photovoltaic cell assembly

technical field

The invention belongs to the technical field of photovoltaic industry, and in particular relates to a photovoltaic anti-glare synergistic reflective film.

Background technique

At present, it is more and more difficult for photovoltaic modules to improve power generation efficiency by improving the efficiency of cells, and it is difficult to achieve breakthroughs in technological progress. Therefore, other ways of improving efficiency have received widespread attention. In photovoltaic modules, the front of the cell is covered by electrodes and ribbons. The area can reach 3.8%, that is to say, the module will lose 3.8% of the output power. In the Chinese patent (publication number: CN103413861A), a photovoltaic module reflective film and its fixing method with the welding ribbon are disclosed. The film refracts the light on the surface of the welding ribbon to the surface of the battery sheet through the surface reflection effect, and improves the light alignment of the module. utilization rate. However, there are still some problems with this type of reflective film: firstly, the angle between the ridge line in the reflective structure and the direction of the welding ribbon is zero, and the trend is single. A structure with a single orientation cannot take full advantage of the sun's rays. Secondly, the structure with a single direction makes the reflected light concentrated in one place, causing glare of the module in the sun, affecting the observation of the surface of the module by the operation and maintenance personnel, and the market reacts strongly. In addition, the bonding method of the reflective film and the welding tape is ordinary low-temperature hot-melt adhesive bonding. This kind of adhesive has poor temperature resistance, and the reflective film is prone to falling off and displacement during the lamination stage. The most important thing is that it is difficult to fix the reflective film in the gap between the cells, and there is no mature and reliable positioning method. Therefore, in view of the above problems, it is necessary to develop a new reflective film for photovoltaic modules.

Contents of the invention

The technical problem to be solved by the present invention is to provide a photovoltaic anti-glare synergistic reflective film to improve the utilization rate of light, improve glare, and solve the problem of fixing the film in the gap.

In order to solve the above technical problems, the present invention provides a photovoltaic anti-glare synergistic reflective film, comprising: a microstructure layer, a reflective layer with reflective properties, a base material layer and a hot melt adhesive layer, the base material layer has a first surface and the second surface corresponding to the first surface, the substrate layer has a planar structure, the microstructure layer is arranged on the first surface, and the microstructure layer is composed of a plurality of strip-shaped unit structures , the unit structure extends along the longitudinal direction of the substrate layer, the top curve and bottom width of the unit structure change periodically, or the top curve and bottom curve of the unit structure change periodically, and the two period changes are continuous A smooth curve, the reflective layer is attached to the microstructure layer, the hot melt adhesive layer is arranged on the reflective layer or under the second surface, and the hot melt adhesive layer has a planar structure.

As the photovoltaic anti-glare synergistic reflective film according to the present invention, it is characterized in that: the top curve of the unit structure changes periodically in the height direction, and the bottom width changes synchronously with it, and the two are positively correlated.

As a preferred solution of the photovoltaic anti-glare synergistic reflective film of the present invention, the top curve and the bottom curve of the unit structure are synchronously changing periodically, and the bottom widths of any two places of the unit structure are equal.

As the photovoltaic anti-glare synergistic reflective film of the present invention, the top curve and the bottom curve of the unit structure are sinusoidal in the length direction of the substrate layer.

As the photovoltaic anti-glare synergistic reflective film according to the present invention, the two points at the widest places on the left and right sides of the bottom of the unit structure are respectively A and B, and the left and right sides of the bottom of the unit structure are the narrowest The two points at are point C and point D respectively, the point A is on the same side as the point C, the point B is on the same side as the point D, and the angle between the line segment AB and the line segment BD is set is α, the α is 81°-89°, and the line segment AB and the line segment CD are both perpendicular to the extending direction of the unit structure.

As the photovoltaic anti-glare synergistic reflective film of the present invention, it is characterized in that: the unit cycle length d of the sinusoidal curve at the top and bottom of the unit structure is 400mm-1200mm, and the amplitude a of the sinusoidal curve is 0.1mm-4mm.

As the photovoltaic anti-glare synergistic reflective film according to the present invention, it is characterized in that: the reflective layer is a metal alloy layer, including any one or more of aluminum, silver, chromium, and nickel, with a thickness of 30-80nm. The substrate layer is made of PET with a thickness of 30-90 μm, the hot-melt adhesive layer is a blend of EVA, SIS and POE resin and a silane coupling agent, and its thickness is 10-500 μm. The cross-section is any one or a combination of two or more of triangles, trapezoids, polygons, closed shapes combined with straight line segments and curved segments.

The photovoltaic anti-glare synergistic reflective film according to the present invention is characterized in that: the cross-section of the unit structure is an isosceles triangle, and the apex angle of the isosceles triangle is 105°-135°.

The photovoltaic anti-glare synergistic reflective film according to the present invention is characterized in that: the width of the bottom of the unit structure is 20-80 μm.

The present invention also provides a photovoltaic cell assembly, wherein the photovoltaic anti-glare synergistic reflective film is arranged on the surface of the ribbon and/or the gap area between the cells; when the photovoltaic anti-glare synergistic reflective film is arranged on the surface of the ribbon When the hot melt adhesive layer is located on the surface of the substrate layer, the hot melt adhesive layer is bonded to the surface of the welding strip; when the photovoltaic anti-glare synergistic reflective film is arranged in the gap area between the battery sheets, The hot-melt adhesive layer is located on the surface of the reflective layer, and the hot-melt adhesive layer is bonded to the frosted surface of the component glass; the longitudinal direction of the photovoltaic anti-glare synergistic reflective film is parallel to the extending direction of the welding strip and the gap.

Compared with the prior art, a photovoltaic anti-glare synergistic reflective film proposed by the present invention has the following advantages: First, by changing the design of the microstructure layer, the reflection range of light is expanded, the glare problem is solved, and the Light utilization rate; Second, innovatively introduce silane coupling agent and heat-resistant resin into the hot-melt adhesive layer, on the one hand, increase the bonding force with the glass, on the other hand, improve the temperature resistance of the hot-melt adhesive , to solve the problem of lamination film deviation. Third, the reflective film is creatively pasted on the glass wool surface, which solves the problem of gap film positioning and facilitates automatic and stable production.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort. in,

Fig. 1 is a schematic diagram of the three-dimensional structure of a photovoltaic anti-glare synergistic reflective film in Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of a vertical and longitudinal cross-sectional structure of a photovoltaic anti-glare synergistic reflective film in Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of the three-dimensional structure of a photovoltaic anti-glare synergistic reflective film in Embodiment 2 of the present invention;

Fig. 4 is a schematic diagram of a vertical and longitudinal cross-sectional structure of a photovoltaic anti-glare synergistic reflective film in Embodiment 2 of the present invention;

Fig. 5 is a top view perpendicular to the substrate surface of a photovoltaic anti-glare synergistic reflective film in Embodiments 1 and 2 of the present invention;

Fig. 6 is a schematic diagram of the three-dimensional structure of a photovoltaic anti-glare synergistic reflective film in Embodiment 3 of the present invention;

Fig. 7 is a schematic diagram of a vertical and longitudinal cross-sectional structure of a photovoltaic anti-glare synergistic reflective film in Embodiment 3 of the present invention;

Fig. 8 is a top view perpendicular to the substrate surface of a photovoltaic anti-glare synergistic reflective film in Embodiment 3 of the present invention.

Among them: 1 is the reflective layer, 2 is the microstructure layer, 3 is the substrate layer, and 4 is the hot melt adhesive layer.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with specific embodiments.

First of all, "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

Secondly, the present invention is described in detail by means of structural schematic diagrams, etc. When describing the embodiments of the present invention in detail, for the convenience of explanation, the schematic diagram showing the structure of a photovoltaic anti-glare synergistic reflective film will not be partially enlarged according to the general scale, and the schematic diagram It is just an example, which should not limit the scope of protection of the present invention. In addition, the three-dimensional space of length, width and depth should be included in actual production.

A photovoltaic anti-glare synergistic reflective film according to the present invention is divided into three layers from top to bottom, which are reflective layer 1, microstructure layer 2, and substrate layer 3. In addition to these three layers, there is also hot melt adhesive Layer 4, as shown in FIG. 1 , the hot-melt adhesive layer 4 is arranged under the substrate layer 3 , and as shown in FIGS. 3 and 6 , the hot-melt adhesive layer 4 is arranged on the reflective layer 1 . The reflective layer 1 is a metal alloy layer, including one or more of aluminum, silver, chromium, and nickel, with a thickness of 30-80 nm; the substrate layer 3 is made of PET material, with a thickness of 30-90 μm; the hot-melt adhesive layer 4 is A blend of EVA, SIS and POE resins and a silane coupling agent, with a thickness of 10-500 μm.

As shown in Figures 1, 3, and 6, the microstructure layer 2 is composed of a plurality of strip-shaped unit structures, the unit structures extend along the longitudinal direction of the substrate layer 3, and the top curves and bottom widths of the unit structures change periodically, or the unit structures The top curve and the bottom curve of the structure change periodically, and the two kinds of periodic changes present continuous smooth curves.

There are three ways to set up the cell structure:

1. The top curve and bottom curve of the unit structure present a sinusoidal curve in the length direction of the substrate layer.

2. As shown in Figures 1 and 3, the top curve of the unit structure changes periodically in the height direction, and the bottom width changes synchronously with it, and the two are positively correlated.

3. As shown in Figure 8, the top curve and the bottom curve of the unit structure are synchronously periodic, and the width of the bottom remains unchanged.

In the above two arrangements 1 and 3, the unit period length d of the sinusoidal curve at the top and bottom of the unit structure is 400mm-1200mm, and the amplitude a of the sinusoidal curve is 0.1mm-4mm.

In the above two setting methods 1 and 2, as shown in Figure 5, the angle α( _∠ABD ) between point B at the widest point of the bottom of the unit structure and point D at the narrowest point on the same side is between 81°～ Between 89°, α is the angle between line segment AB and line segment BD, and AB and CD are perpendicular to the extension direction of the unit structure.

In the above settings, the cross section of the unit structure is one or more combinations of closed shapes of triangle, trapezoid, polygon, straight line segment and curved segment, as shown in Figures 2, 4 and 7, the cross section of the unit structure The cross section is an isosceles triangle, and the apex angle of the isosceles triangle is between 105°-135°, preferably 120°. The width of the widest part of the bottom of the unit structure is 20-80 μm, preferably 50-70 μm.

The photovoltaic anti-glare synergistic reflective film using the above scheme is applied to photovoltaic modules. The photovoltaic anti-glare synergistic reflective film is placed on the surface of the ribbon or the gap between the cells. The photovoltaic anti-glare synergistic reflective film can be used alone or at the same time. Set in the gap area between the surface of the ribbon and the battery sheet; when the photovoltaic anti-glare synergistic reflective film is set on the surface of the ribbon, the hot melt adhesive layer is located on the surface of the substrate, and the hot melt adhesive layer is attached to the surface of the ribbon; when When the photovoltaic anti-glare synergistic reflective film is installed in the gap area of the cell, the hot melt adhesive layer is located on the surface of the reflective layer, and the hot melt adhesive layer is attached to the rough surface of the glass of the module; The direction of extension is parallel.

For specific implementation, please refer to the following examples 1-3:

Example 1

As shown in Figure 1, Figure 2, and Figure 5, the photovoltaic anti-glare synergistic reflective film has a four-layer structure, which is set at the position of the welding strip and attached to the surface of the welding strip. From top to bottom, it is the reflective layer 1 and the microstructure layer. 2. The substrate layer 3, the hot melt adhesive layer 4, and the cross section of the microstructure layer 2 are isosceles triangles. The composition of the reflective layer 1 is: aluminum 99wt%, nickel 0.3wt%, silver 0.5wt%, chromium 0.2wt%. Components of the hot melt adhesive layer 4 are: EVA (60wt%), SIS (26wt%), POE (13wt%), silane coupling agent (1wt%), specific parameters and film sticking effects are shown in Table 1.

Table 1 Example 1 reflective film parameter settings

Example 2

As shown in Figure 3, Figure 4, and Figure 5, the photovoltaic anti-glare synergistic reflective film has a four-layer structure, which is installed in the gap between the cells and attached to the rough surface of the glass. From top to bottom, there are hot melt adhesive layers 4, Reflective layer 1, microstructure layer 2, substrate layer 3, the section of microstructure layer 2 is an isosceles triangle, the composition of reflective layer 1 is: aluminum 98wt%, nickel 0.6wt%, silver 1.0wt%, chromium 0.4wt%. Components of the hot melt adhesive layer 4 are: EVA (58wt%), SIS (27wt%), POE (14wt%), silane coupling agent (1wt%), and the specific parameters and filming effects are shown in Table 2.

Table 2 Example 2 reflective film parameter settings

Example 3

As shown in Figure 6, Figure 7, and Figure 8, the photovoltaic anti-glare synergistic reflective film has a four-layer structure, which is installed in the gap between the cells and attached to the rough surface of the glass. From top to bottom, there are hot melt adhesive layers 4, The reflective layer 1, the microstructure layer 2, the base material layer 3, and the cross section of the microstructure layer 2 are isosceles triangles. The composition of the reflection layer 1 is: aluminum 98.5wt%, nickel 0.3wt%, silver 1.0wt%, chromium 0.2wt%. Components of the hot melt adhesive layer 4 are: EVA (65wt%), SIS (25wt%), POE (8.5wt%), silane coupling agent (1.5wt%). The specific parameters and film-sticking effects are shown in Table 3.

Table 3 Example 3 reflective film parameter settings

Those of ordinary skill in the art should be able to understand that one of the characteristics or purposes of the present invention is: the photovoltaic anti-glare synergistic reflective film proposed by the present invention, firstly, by changing the design of the microstructure layer, the light beam is expanded The reflection range solves the glare problem and improves the utilization rate of light; secondly, innovatively introduces silane coupling agent and heat-resistant resin into the hot melt adhesive layer, on the one hand, it increases the bonding force with the glass, on the other hand On the one hand, the temperature resistance of the hot melt adhesive is improved, and the problem of lamination film deviation is solved. Third, the reflective film is creatively pasted on the glass wool surface, which solves the problem of gap film positioning and facilitates automatic and stable production.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation, although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (10)

1. A photovoltaic anti-glare synergistic reflective film, characterized in that it comprises: a microstructure layer, a reflective layer with reflective properties, a base material layer and a hot melt adhesive layer, and the base material layer has a first surface and is compatible with the The second surface corresponding to the first surface, the base material layer has a planar structure, the microstructure layer is arranged on the first surface, and the microstructure layer is composed of a plurality of strip-shaped unit structures. The unit structure extends along the longitudinal direction of the substrate layer, and the top curve and bottom width of the unit structure change periodically, or the top curve and bottom curve of the unit structure change periodically, and the two kinds of periodic changes present continuous smooth curves, The reflective layer is attached to the microstructure layer, the hot melt adhesive layer is arranged on the reflective layer or under the second surface, and the hot melt adhesive layer has a planar structure. 2. The photovoltaic anti-glare synergistic reflective film according to claim 1, characterized in that: the top curve of the unit structure changes periodically in the height direction, and the bottom width changes synchronously with it, and the two are positively correlated. 3. The photovoltaic anti-glare synergistic reflective film according to claim 1, characterized in that: the top curve and the bottom curve of the unit structure are synchronously changing periodically, and the bottom widths of any two places of the unit structure are equal. 4. The photovoltaic anti-glare synergistic reflective film according to claim 1, characterized in that: the top curve and the bottom curve of the unit structure are sinusoidal in the length direction of the substrate layer. 5. The photovoltaic anti-glare synergistic reflective film according to any one of claims 2 or 4, wherein the two points at the widest places on the left and right sides of the bottom of the unit structure are respectively A points and point B, the two narrowest points on the left and right sides of the bottom of the unit structure are points C and point D respectively, the point A is on the same side as the point C, and the point B is on the same side as the point D On the other hand, it is assumed that the angle between the line segment AB and the line segment BD is α, and the α is 81°-89°, and the line segment AB and the line segment CD are both perpendicular to the extending direction of the unit structure. 6. The photovoltaic anti-glare synergistic reflective film according to any one of claims 3 or 4, characterized in that: the unit cycle length d of the sinusoidal curve at the top and bottom of the unit structure is 400mm-1200mm, The amplitude a of the sinusoidal curve is 0.1mm-4mm. 7. The photovoltaic anti-glare synergistic reflective film as claimed in claim 1, characterized in that: the reflective layer is a metal alloy layer, comprising any one or more of aluminum, silver, chromium, and nickel, with a thickness of 30 -80nm, the substrate layer is made of PET material with a thickness of 30-90μm, the hot melt adhesive layer is a blend of EVA, SIS and POE resin and a silane coupling agent, with a thickness of 10-500μm, the unit The cross-section of the structure is any one or a combination of two or more of triangles, trapezoids, polygons, closed shapes combined with straight line segments and curved segments. 8. The photovoltaic anti-glare synergistic reflective film according to claim 7, characterized in that: the cross-section of the unit structure is an isosceles triangle, and the vertex angle of the isosceles triangle is 105°-135°. 9. The photovoltaic anti-glare synergistic reflective film according to claim 1, characterized in that: the width of the bottom of the unit structure is 20-80 μm. 10. A photovoltaic cell assembly, characterized in that: the photovoltaic anti-glare synergistic reflective film according to any one of claims 1-9 is arranged on the surface of the welding strip and/or the gap area between the battery sheets; when the When the photovoltaic anti-glare synergistic reflective film is arranged on the surface of the welding ribbon, the hot melt adhesive layer is located on the surface of the substrate layer, and the hot melt adhesive layer is attached to the surface of the welding ribbon; when the photovoltaic anti-glare synergistic reflective When the film is placed in the gap area between the battery sheets, the hot melt adhesive layer is located on the surface of the reflective layer, and the hot melt adhesive layer is bonded to the frosted surface of the component glass; the longitudinal direction of the photovoltaic anti-glare synergistic reflective film is The direction is parallel to the extending direction of the ribbon and the void.