CN214060391U

CN214060391U - Novel photovoltaic adhesive film, photovoltaic back plate and photovoltaic module

Info

Publication number: CN214060391U
Application number: CN202022528520.3U
Authority: CN
Inventors: 邓伟; 杨楚峰; 吴倩
Original assignee: Hangzhou First Applied Material Co Ltd
Current assignee: Hangzhou First Applied Material Co Ltd
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2021-08-27
Anticipated expiration: 2030-11-05

Abstract

The utility model relates to a photovoltaic module technical field especially relates to a novel photovoltaic glued membrane, photovoltaic backplate and photovoltaic module, wherein, novel photovoltaic glued membrane includes: a glue film layer: providing an adhesion base for the reflective coating; reflection coating: the coating area of the reflecting coating corresponds to the gaps of the battery pieces and partial battery pieces around the gaps; and (3) tackifying and transparent coating: the reflecting coating is arranged on one side of the reflecting coating, which is far away from the adhesive film layer, and is used for improving the bonding strength with the battery piece. The utility model provides a reflective coating passes through tackifying clear coat and battery piece and clearance connection, and the bond strength ideal, and the fracture can not appear in reflective coating moreover, in the subassembly use, is difficult to appear the problem of battery piece and coating delaminating, guarantees the launch utilization effect that reflective coating set a camera.

Description

Novel photovoltaic adhesive film, photovoltaic back plate and photovoltaic module

Technical Field

The utility model relates to a photovoltaic module technical field especially relates to a novel photovoltaic glued membrane, photovoltaic backplate and photovoltaic module.

Background

With the arrival of the age of flat-price photovoltaic networking, the continuous improvement of the power generation efficiency of a photovoltaic module becomes a consensus of the industry, technical innovations in the aspect of battery pieces include double-sided batteries, half-piece batteries, laminated batteries and the like, innovations in the aspect of packaging materials include white glue films, gridding transparent back plates, gridding glass and the like, wherein the double-sided batteries can be used in a mode of being combined with the half-piece batteries, the laminated batteries and the like, the power generation power of the battery pieces is improved as much as possible, and therefore the double-sided batteries become a mainstream development direction of the photovoltaic industry. The conventional packaging material cannot be perfectly matched with the double-sided battery, the packaging loss exists at the gap of the assembly, and the latticed adhesive film can well solve the problem.

The latticed adhesive film generally comprises a photovoltaic adhesive film and a latticed coating, wherein the latticed coating faces the cell, and reflects sunlight at the gap of the cell back to the surface of the cell, so that the power generation power of the assembly is improved.

For example, chinese patent application publication No. CN111403522A discloses a packaging adhesive film with a grid structure and a method for manufacturing the same, in which a white grid structure is designed on an adhesive film closer to a solar cell, and the white grid structure has high front-side power generation power and back-side power generation power when used for the solar cell. Also, as disclosed in chinese patent application with patent publication No. CN111718661A, 9/29/2020, a grid-type packaging adhesive film and a method for manufacturing the same are provided, wherein a reflective grid layer having a grid-type structure is provided for reflecting light, the reflective grid layer is provided on one side of the surface layer of the adhesive film having a flat surface, and the outline of the reflective grid layer is adapted to the gap between two battery pieces and the gap between the battery pieces and the edge of the module. In order to completely shield the gaps of the battery pieces, the latticed coating in the prior art is designed to cover the area of 1-2mm on the battery pieces generally, so that the problem of light leakage is avoided. However, in the prior art, the latticed coating is directly contacted with the battery piece, the bonding strength between the coating and the battery piece is often lower than that between the adhesive film and the battery piece, and the problem of delamination between the battery piece and the coating is easy to occur in the using process of the assembly.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a novel photovoltaic glued membrane overcomes the problem that the bonding strength is poor, easily drops that present latticed coating exists with the battery piece, in addition, the fracture can not appear in the reflective coating.

The utility model adopts the following technical proposal:

a novel photovoltaic adhesive film, comprising:

a glue film layer: used for blocking ultraviolet rays and providing an adhesion base for the reflective coating;

reflection coating: the coating area of the reflecting coating corresponds to the gaps of the battery pieces and partial battery pieces around the gaps;

and (3) tackifying and transparent coating: the tackifying transparent coating is arranged on one side of the reflecting coating far away from the adhesive film layer, and the coating area of the tackifying transparent coating is larger than or equal to that of the reflecting coating, so that the adhering strength of the tackifying transparent coating and the cell piece is improved.

The reflective coating may be provided in a grid or stripe, including but not limited to the two forms described above. When the solar cell module is a conventional solar cell module, the gaps are in a grid shape, and the reflective coating is correspondingly arranged in a grid shape; when the laminated cell or the laminated tile cell is adopted, the gap is in a strip shape, and the reflective coating is correspondingly arranged in a strip shape.

In one embodiment, the transparent tie coat layer has the same structure as the reflective coating layer, and the coating region of the transparent tie coat layer corresponds to the coating region of the reflective coating layer.

In one embodiment, the coating area of the adhesion-promoting clear coating is greater than the coating area of the reflective coating.

In one embodiment, the coating area of the transparent tackifying coating is equal to the area of the adhesive film layer.

Preferably, the tackifying transparent coating is a polyester layer or a polyurethane layer or an acrylate layer.

Preferably, the reflective coating is a UV resin coating layer.

Preferably, the reflective coating has a thickness of 10-100 μm. For example, the thickness is 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, or the like.

Preferably, the thickness of the adhesion-promoting clear coat layer is 10 to 100 μm. For example, the transparent adhesive coating layer has a thickness of 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, or the like.

Preferably, the adhesive film layer is an EVA adhesive film layer or a POE adhesive film layer.

Preferably, the thickness of the adhesive film layer is 300-.

The preparation method of the novel photovoltaic adhesive film comprises the following steps: preparing an adhesive film layer by tape casting extrusion, printing (screen printing, intaglio printing, relief printing and the like) the reflective coating, carrying out ultraviolet curing, then printing or printing the tackifying transparent coating, and drying and curing at a low temperature.

Compared with a layer of adhesive film for casting, the printing speed is higher, and the cost is lower.

The utility model also provides a photovoltaic backplate contains foretell novel photovoltaic glued membrane.

The utility model also provides a photovoltaic module contains foretell novel photovoltaic glued membrane.

Through implementing above-mentioned technical scheme, the utility model discloses following beneficial effect has:

the utility model provides a reflective coating passes through tackifying clear coat and battery piece and clearance connection, and the bond strength ideal, and the fracture can not appear in reflective coating moreover, in the subassembly use, is difficult to appear the problem of battery piece and coating delaminating, guarantees the launch utilization effect that reflective coating set a camera.

Drawings

Fig. 1 is a schematic plan view of an embodiment of the present invention.

FIG. 2 is a top view of the adhesive packaging film of example 1;

FIG. 3 is a schematic plan view of another embodiment of the present invention;

fig. 4 is a schematic plan view of another embodiment of the present invention; FIG. 5 is a top view of a packaging film according to another embodiment of the present invention;

fig. 6 is a schematic plan view of comparative example 1.

Detailed Description

The present invention is further described with reference to the accompanying drawings and examples, which are for the purpose of simplifying the drawing, and the scope of the present invention is not limited to the examples, but various modifications and changes can be made by persons skilled in the relevant art without departing from the spirit and scope of the present invention, and such modifications and changes are to be included in the scope of the present invention.

Example 1

A packaging adhesive film with a structure comprises an adhesive film layer 01, a reflective coating 02 and a tackifying transparent coating 03 which are sequentially arranged from bottom to top, as shown in figure 1.

Wherein the adhesive film layer is an EVA adhesive film layer (or POE, multilayer coextrusion) with the thickness of 300 mu m.

The reflective coating is in a grid shape, as shown in fig. 2, and is formed on the adhesive film layer by printing, the thickness is 20 μm, and the coating part of the structure corresponds to the cell gap and the 1cm area around the gap.

The reflective coating adopts UV resin coating, and the specific formula is as follows: 60% of UV propylene resin, 10% of acrylate, 5% of photoinitiator, 20% of titanium dioxide and 5% of auxiliary agent.

The transparent tackifying coating is formed on the reflective coating by means of printing, and the coating area of the transparent tackifying coating corresponds to the coating area of the reflective coating and has a thickness of 10 μm. The tackifying transparent coating adopts an acrylate layer, and the formula comprises the following components in parts by weight: 30% of acrylate, 20% of epoxy resin, 5% of silane coupling agent, 40% of solvent and 5% of auxiliary agent.

Example 2

The difference from example 1 is that the adhesive layer is a POE layer having a thickness of 1000 μm and the reflective coating layer has a thickness of 100. mu.m. The coating area of the adhesion promoting clear coating is greater than the coating area of the reflective coating as shown in fig. 3.

Example 3

The difference from example 1 is that the adhesive film layer is a POE layer with a thickness of 500 μm and the tackifying transparent coating layer has a thickness of 100 μm. The coated area of the tie clear coat covers the entire area of the adhesive film layer as shown in fig. 4.

Example 4

The difference from example 1 is that the thickness of the adhesive film layer is 700 μm, the thickness of the reflective coating layer is 60 μm, and the thickness of the adhesion promoting transparent coating layer is 40 μm.

Example 5

The difference from example 1 is that the thickness of the adhesive film layer is 500 μm, the thickness of the reflective coating layer is 40 μm, and the thickness of the adhesion promoting transparent coating layer is 60 μm.

Example 6

The difference from example 1 is that the thickness of the reflective coating is 10 μm.

Example 7:

the difference from example 1 is that the coated areas of the reflective coating are in the form of strips, as shown in fig. 5, for use in a laminated or tiled cell. The coating area of the tie clear coat is consistent therewith.

Comparative example 1:

conventional grid adhesive film

The difference from example 1 is that the thickness of the tackified transparent grid coating is 0 μm, i.e., the tackified transparent grid coating is not provided, as shown in fig. 6.

A sample preparation process: preparing a sample according to the structure of the solar component, sequentially laminating from top to bottom by using ultra-white glass, a transparent EVA (ethylene vinyl acetate) adhesive film, a double-sided battery piece, a grid adhesive film and a back plate (KPK), and laminating for 10min by using a laminating machine at the temperature of 145 ℃ and the vacuumizing time of 6 min. The tackifying transparent grid coating is contacted with the battery piece, and the adhesive film layer is contacted with the back plate. In comparative example 1, there is no second transparent adhesive film, and thus there is no operation of contacting the second transparent adhesive film with the battery sheet.

And (3) carrying out performance test on the adhesive films obtained in the examples and the comparative examples, wherein the test method comprises the following steps:

1. the peel strength test method comprises the following steps:

the performance test was carried out according to GBT 29848 and 2013 ethylene-vinyl acetate copolymer (EVA) for photovoltaic module encapsulation. And testing the reflectivity of the assembly, the peeling strength of the rear adhesive film and the battery piece, the peeling strength of the rear adhesive film and the front adhesive film, and the peeling strength of the rear adhesive film and the back plate.

2. Method for testing whether coating cracks

No national standard test method

And (3) manufacturing the solar module according to the sample preparation process, and observing whether the white coating cracks or not by visual observation after the lamination is finished.

The test results are shown in table 1:

TABLE 1

Claims

1. A novel photovoltaic adhesive film is characterized by comprising:

a glue film layer: providing an adhesion base for the reflective coating;

and (3) tackifying and transparent coating: the reflecting coating is arranged on one side of the reflecting coating, which is far away from the adhesive film layer, and is used for improving the bonding strength with the battery piece.

2. The novel photovoltaic adhesive film according to claim 1, wherein the transparent adhesion-promoting coating layer is a polyester layer, a polyurethane layer or an acrylate layer.

3. The novel photovoltaic adhesive film as claimed in claim 1, wherein the reflective coating is a UV resin coating layer.

4. The novel photovoltaic adhesive film according to claim 2, wherein the thickness of the reflective coating layer is 10-100 μm.

5. The novel photovoltaic adhesive film according to claim 3, wherein the thickness of the tackified transparent coating is 10-100 μm.

6. The novel photovoltaic adhesive film according to claim 1, wherein the adhesive film layer is an EVA adhesive film layer or a POE adhesive film layer.

7. The novel photovoltaic adhesive film as claimed in claim 6, wherein the thickness of the adhesive film layer is 300-1000 μm.

8. A photovoltaic backsheet comprising the novel photovoltaic film of any one of claims 1-7.

9. A photovoltaic module comprising the novel photovoltaic film of any one of claims 1-7.