CN218665863U

CN218665863U - Composite packaging adhesive film and photovoltaic module

Info

Publication number: CN218665863U
Application number: CN202222313040.4U
Authority: CN
Inventors: 林建伟; 张付特; 金旭; 唐邓; 李胜; 杜东伟; 李明
Original assignee: Jiangsu Zhonglai New Material Technology Co ltd
Current assignee: Jiangsu Zhonglai New Material Technology Co ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2023-03-21
Anticipated expiration: 2032-08-31

Abstract

The utility model relates to a solar energy encapsulation glued membrane technical field discloses a compound encapsulation glued membrane and photovoltaic module. The composite packaging adhesive film comprises a first EVA adhesive layer, a first anti-seepage blocking layer, a POE adhesive layer, a second anti-seepage blocking layer and a second EVA adhesive layer which are sequentially stacked from top to bottom; the first barrier layer and the second barrier layer are poly (4-methyl-1-pentene) layers. Through the cooperation of first prevention of seepage barrier layer, POE glue film and second prevention of seepage barrier layer to inject first prevention of seepage barrier layer and second prevention of seepage barrier layer and be poly (4-methyl-1-pentene) layer, can reduce polarity auxiliary agent in the POE glue film by a wide margin and to first EVA glue film and the migration of second EVA glue film, so can improve the storage cycle of compound encapsulation glued membrane, and can effectively prevent the reduction by a wide margin of peel strength, the degree of crosslinking and the anti PID performance of compound encapsulation glued membrane in the storage cycle, make its performance meet the demands, and can not lead to photovoltaic module end lamination delamination problem.

Description

Composite packaging adhesive film and photovoltaic module

Technical Field

The utility model relates to a solar energy encapsulation glued membrane technical field, concretely relates to compound encapsulation glued membrane and photovoltaic module.

Background

With the advancement of the targets of '2030 carbon peak reaching and 2060 carbon neutralization', the new energy industry enters a new rapid development period, and countries all over the world actively promote the development of new energy cause. Photovoltaic power generation, as an important component in the field of new energy, has also entered a rapid growth cycle.

Since the power generation gain of the double-sided double-glass assembly can reach 8-15%, the market share of the double-sided double-glass assembly is continuously increased in the years, and the double-sided double-glass assembly is undoubtedly one of the future development trends. The vast majority of the current battery pieces used by the double-sided double-glass assembly are Perc double-sided battery pieces and Topcon double-sided battery pieces, and the two battery pieces adopt an aluminum oxide passivation technology, so that the power generation efficiency of the battery pieces is greatly improved. However, when the double-sided double-glass Perc battery assembly and the double-sided double-glass Topcon battery assembly generate electricity outdoors, negative voltage can be generated through the outer frame, and then the negative voltage can be transmitted to the front glass and the back glass through water vapor, so that sodium ions and potassium ions in the glass pass through the packaging adhesive film (such as an EVA packaging adhesive film) to reach the SiNx layer and the AlOx layer of the battery piece, the SiNx layer and the AlOx layer become a composite center, and the AlOx layer is damaged, thereby the negative electric field passivation effect of the AlOx layer is weakened, the reflectivity of the AlOx layer to infrared light is reduced, the phenomenon that the power of the photovoltaic assembly is greatly attenuated is caused, and the serious PID problem is generated.

Therefore, for a double-sided dual-glass battery assembly adopting an aluminum oxide passivation technology, a serious PID problem is caused by adopting a traditional EVA packaging adhesive film. The pure POE packaging adhesive film is adopted, so that the PID problem is solved; however, in the process of laminating the photovoltaic module, not only the laminating time is prolonged, but also problems such as sheet combination, slipping and air bubbles are easily generated, thereby reducing the laminating efficiency of the photovoltaic module and the yield of the photovoltaic module manufacturing process.

Based on this, the EPE packaging adhesive film formed by EVA/POE/EVA multilayer coextrusion, such as the EPE photovoltaic adhesive film provided by the publication number CN114774023A, can overcome the problems of PID and the problems of sheet combination, slipping, air bubbles and long laminating time caused by pure POE packaging adhesive films. However, because the resin used in the POE adhesive layer of the EPE encapsulating adhesive film is a non-polar resin, the mixing compatibility with the polar auxiliary agent in the POE adhesive layer is poor, and the resin used in the EVA adhesive layer is a polar resin, the compatibility with the polar auxiliary agent is good; therefore, in the laminating and storing processes, the polar auxiliary agent of the POE adhesive layer in the middle of the EPE packaging adhesive film can be greatly migrated into the EVA adhesive layer of which the used resin is polar resin; for the POE glue layer of ethylene-octene copolymerization, the comprehensive performance after the migration of the polar additive is reduced by a small extent, and the standard requirement can be basically met; however, for the POE adhesive layer copolymerized by ethylene and butylene, after the polar auxiliary agent is migrated, the peel strength, the crosslinking degree and the PID resistance of the POE adhesive layer are rapidly and greatly reduced, so that the performance of the POE adhesive layer is unqualified, the storage period of the EPE packaging adhesive film is short, the problem of delamination of the EPE packaging adhesive film during the lamination of the photovoltaic module end is easily caused, and the requirement of mass production cannot be met. The POE particles for photovoltaic ethylene-octene copolymerization in the market can be produced only by the Dow chemistry, the productivity is low, and the demand cannot be met; the photovoltaic POE particles copolymerized by the ethylene and the butylene can be produced by both LG chemistry and Dow chemistry, the production capacity scale is larger than that of the POE particles copolymerized by the ethylene and the octene, and the production cost is lower than that of the POE particles copolymerized by the ethylene and the octene. Therefore, the problem of unqualified performance caused by polar additive migration of the POE glue layer of ethylene-butylene copolymerization in the EPE packaging glue film is urgently needed to be solved so as to meet the market supply demand and further meet the demand of continuously expanding the market of the double-sided double-glass battery assembly.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a composite packaging glued membrane and photovoltaic module, can reduce the polarity auxiliary agent migration in the POE glue film by a wide margin, can ensure peel strength, cross-linking degree and the anti PID performance of composite packaging glued membrane in the storage cycle to can improve its storage cycle, and can not lead to photovoltaic module end lamination delamination problem.

Based on the above, the utility model discloses a composite packaging adhesive film, which comprises a first EVA adhesive layer, a POE adhesive layer and a second EVA adhesive layer which are sequentially laminated from top to bottom; be equipped with first prevention of seepage barrier layer between first EVA glue film and the POE glue film, just be equipped with second prevention of seepage barrier layer between POE glue film and the second EVA glue film, first prevention of seepage barrier layer and second prevention of seepage barrier layer are for gathering (4-methyl-1-pentene) layer.

Preferably, the material of the poly (4-methyl-1-pentene) layer is a poly (4-methyl-1-pentene) transparent material with the crystallinity of 60-70%.

More preferably, the material of the poly (4-methyl-1-pentene) layer is a poly (4-methyl-1-pentene) transparent material with a visible light transmittance of more than 90%.

Preferably, the first and second barrier layers have a thickness of 20-50 μm.

Preferably, the POE adhesive layer is an ethylene-butylene copolymer adhesive layer.

Preferably, the thickness of the POE glue layer is 150-400 μm.

Preferably, the thickness of the first EVA adhesive layer and the second EVA adhesive layer is 100-300 μm.

Preferably, the composite packaging adhesive film is a five-layer melt co-extrusion laminated structure.

The utility model also discloses a photovoltaic module, include from last to the photovoltaic front bezel, first encapsulation glued membrane, solar wafer, second encapsulation glued membrane and the photovoltaic backplate that set up of stromatolite in proper order down, first encapsulation glued membrane and/or second encapsulation glued membrane do the utility model relates to an above-mentioned a compound encapsulation glued membrane.

Preferably, the photovoltaic front panel and the photovoltaic back panel are both glass plates; the solar cell is a double-sided power generation solar cell. That is, photovoltaic module is a two-sided dual glass assembly.

Compared with the prior art, the utility model discloses at least, including following beneficial effect:

the composite packaging adhesive film of the utility model is provided with a poly (4-methyl-1-pentene) layer between the first EVA adhesive layer and the POE adhesive layer and between the POE adhesive layer and the second EVA adhesive layer; the poly (4-methyl-1-pentene) has high crystallinity, the crystalline region of the poly (4-methyl-1-pentene) layer can play a role in hindering permeation and migration of polar additives in the POE adhesive layer, and the poly (4-methyl-1-pentene) is non-polar resin and can repel the polar additives, so that the poly (4-methyl-1-pentene) layer can effectively prevent the polar additives in the POE adhesive layer from migrating to the first EVA adhesive layer and the second EVA adhesive layer; moreover, the poly (4-methyl-1-pentene), the EVA and the POE all have ethylene chain segments, have better compatibility with each other, and can ensure that the interfaces of the poly (4-methyl-1-pentene) layer, the first EVA adhesive layer, the POE adhesive layer and the second EVA adhesive layer are mutually fused so as to prevent delamination; meanwhile, the visible light transmittance of the poly (4-methyl-1-pentene) is also very high, and the visible light transmittance of the composite packaging adhesive film and the photovoltaic power generation performance of the photovoltaic module are not influenced.

In conclusion, the poly (4-methyl-1-pentene) layer is used as the first anti-seepage barrier layer and the second anti-seepage barrier layer, so that the migration of the polar assistant of the POE adhesive layer can be greatly reduced under the condition that the visible light transmittance of the composite packaging adhesive film is not reduced, the performance retention rate of the peeling strength, the crosslinking degree and the PID resistance of the composite packaging adhesive film in the storage period is improved, the storage period is prolonged, the performance meets the requirements, and the problem of laminating and delaminating of the photovoltaic module end is avoided.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a composite packaging adhesive film according to the embodiment.

The reference numbers illustrate: a first EVA adhesive layer 1; a first barrier layer 2; POE glue layer 3; a second barrier layer 4; and a second EVA adhesive layer 5.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Examples

Referring to fig. 1, the composite packaging adhesive film of this embodiment includes a first EVA adhesive layer 1, a POE adhesive layer 3, and a second EVA adhesive layer 5, which are sequentially stacked from top to bottom; a first anti-seepage barrier layer 2 is arranged between the first EVA adhesive layer 1 and the POE adhesive layer 3, a second anti-seepage barrier layer 4 is arranged between the POE adhesive layer 3 and the second EVA adhesive layer 5, and the first anti-seepage barrier layer 2 and the second anti-seepage barrier layer 4 are poly (4-methyl-1-pentene) layers.

The composite packaging adhesive film of the embodiment is a novel EPE packaging adhesive film, and is provided with a first anti-seepage barrier layer 2 between a first EVA adhesive layer 1 and a POE adhesive layer 3 and a second anti-seepage barrier layer 4 between the POE adhesive layer 3 and a second EVA adhesive layer 5 on the basis of the first EVA adhesive layer 1, the POE adhesive layer 3 and the second EVA adhesive layer 5, wherein the first anti-seepage barrier layer 2 and the second anti-seepage barrier layer 4 are both poly (4-methyl-1-pentene) layers.

Because the crystallinity of the poly (4-methyl-1-pentene) is higher, the crystallization area of the poly (4-methyl-1-pentene) layer can play a role in hindering the permeation and migration of the polar auxiliary agent in the POE adhesive layer 3, so that the polar auxiliary agent in the POE adhesive layer 3 can be prevented from migrating into the first EVA adhesive layer 1 and the second EVA adhesive layer 5, and the migration speed of the polar auxiliary agent is delayed; and poly (4-methyl-1-pentene) is nonpolar resin, can play a certain repulsion role on polar additives, and can also prevent the polar additives in the POE adhesive layer 3 from migrating into the first EVA adhesive layer 1 and the second EVA adhesive layer 5 to a certain extent.

Moreover, the ethylene chain segment on the resin main chain of the poly (4-methyl-1-pentene) has better compatibility with the ethylene chain segment in the EVA resin and the ethylene chain segment in the POE resin, so that the mutual fusion of the interfaces of the poly (4-methyl-1-pentene) layer, the first EVA adhesive layer 1, the POE adhesive layer 3 and the second EVA adhesive layer 5 can be ensured, and the delamination phenomenon of the composite packaging adhesive film is prevented. Meanwhile, although the crystallinity of the poly (4-methyl-1-pentene) is higher, the visible light transmittance of the poly (4-methyl-1-pentene) layer is also very high, so that the visible light transmittance of the whole composite packaging adhesive film cannot be influenced and the photovoltaic power generation performance of the photovoltaic module cannot be influenced by using the poly (4-methyl-1-pentene) layer as the first anti-seepage barrier layer 2 and the second anti-seepage barrier layer 4.

In conclusion, the poly (4-methyl-1-pentene) layer is used as the first anti-seepage and blocking layer 2 and the second anti-seepage and blocking layer 4, so that migration of the polar assistant of the POE adhesive layer 3 can be greatly reduced under the condition that the visible light transmittance of the composite packaging adhesive film is not reduced, the performance retention rate of the peel strength, the crosslinking degree and the PID (proportion integration differentiation) resistance performance of the composite packaging adhesive film in the storage period is improved, the storage period of the composite packaging adhesive film is prolonged, the performance of the composite packaging adhesive film meets the requirements, and the problem of laminating and delaminating of the end of the photovoltaic module cannot be caused.

Further, in order to improve the effect of the poly (4-methyl-1-pentene) layer on the barrier effect of the POE adhesive layer 3 to the penetration and migration of the polar additive, the poly (4-methyl-1-pentene) layer is preferably made of a poly (4-methyl-1-pentene) transparent material with the existing crystallinity of 60 to 70%.

Furthermore, in order to increase the visible light transmittance of the poly (4-methyl-1-pentene) layer and the whole composite packaging adhesive film, the poly (4-methyl-1-pentene) layer is preferably made of a poly (4-methyl-1-pentene) transparent material with the existing visible light transmittance of more than 90%.

Of these, POE glue layer 3 is preferably ethylene-butylene copolymer glue layer. Compared with an ethylene-octene copolymer adhesive layer, the ethylene-butene copolymer adhesive layer has wider sources, larger stock and lower raw material cost, can meet the large-scale supply demand of the market, and further meets the continuously expanded demand of the market of the double-sided double-glass battery assembly.

The thicker the thickness of the composite packaging adhesive film is, the higher the cost is; if the thickness of the composite packaging adhesive film is too thin, the performance requirements of each layer and the whole composite packaging adhesive film cannot be met. Based on this, in this embodiment, the total thickness of the composite adhesive film for encapsulation is controlled to be 400-700 μm, the thicknesses of the first barrier layer 2 and the second barrier layer 4 are controlled to be 20-50 μm (such as 20 μm, 30 μm, or 50 μm), and the thicknesses of the first EVA glue layer 1, the POE glue layer 3, and the second EVA glue layer 5 in the composite adhesive film for encapsulation are further defined as follows:

the thickness of the POE glue layer 3 is controlled to be 150-400 μm, and is preferably 250-300 μm. Because, if the POE glue layer 3 is too thin, the PID resistance performance is poor; if the POE glue layer 3 is too thick, the cost is higher.

The thickness of the first EVA adhesive layer 1 and the second EVA adhesive layer 5 is controlled to be 100-300 μm, preferably 150-200 μm. Because, if the first EVA adhesive layer 1 and the second EVA adhesive layer 5 are too thin, the adhesion performance with the glass and the solar cell sheet may be reduced, which affects the encapsulation effect of the photovoltaic module; if first EVA glue film 1 and second EVA glue film 5 are too thick, the cost is high again, and then influences compound encapsulation glued membrane and whole photovoltaic module's raw materials cost and manufacturing cost.

The composite packaging adhesive film of the embodiment is a laminated structure formed by melt co-extrusion of five layers, namely a first EVA adhesive layer 1, a first anti-seepage barrier layer 2, a POE adhesive layer 3, a second anti-seepage barrier layer 4 and a second EVA adhesive layer 5. The melt co-extrusion molding process comprises the following steps: respectively extruding the conventional EVA adhesive, poly (4-methyl-1-pentene) transparent material and POE adhesive to the same five-layer co-extrusion die head by three single-screw extruders, wherein the extrusion temperature of the EVA adhesive and the POE adhesive is 60-100 ℃, the extrusion temperature of the poly (4-methyl-1-pentene) transparent material is 240-260 ℃, and extruding five layers of materials by the die head, and then embossing, cooling, drawing and rolling to obtain the composite packaging adhesive film of the embodiment.

In an example of this embodiment, the composite encapsulant film is prepared by performing five-layer melt coextrusion on a first EVA adhesive layer 1 having a thickness of 150 μm, a first impermeable barrier layer 2 having a thickness of 50 μm, a POE adhesive layer 3 having a thickness of 250 μm, a second impermeable barrier layer 4 having a thickness of 50 μm, and a second EVA adhesive layer 5 having a thickness of 150 μm, where the first impermeable barrier layer 2 and the second impermeable barrier layer 4 are poly (4-methyl-1-pentene) layers formed by using an existing poly (4-methyl-1-pentene) transparent material (crystallinity is 65% and visible light transmittance is 91%).

The composite encapsulating adhesive film prepared in the above example (referred to as sample 1) and a conventional EPE encapsulating adhesive film (referred to as sample 2, which is prepared by three-layer melt co-extrusion molding of a first EVA adhesive layer 1 having a thickness of 150 μm, a POE adhesive layer 3 having a thickness of 250 μm, and a second EVA adhesive layer 5 having a thickness of 150 μm) were subjected to the performance tests as shown in the following table 1:

TABLE 1

Therefore, compared with the conventional EPE packaging adhesive film, the composite packaging adhesive film of the example is additionally provided with the poly (4-methyl-1-pentene) layer, so that the great reduction of the peeling strength, the crosslinking degree and the PID (proportion integration differentiation) resistance of the composite packaging adhesive film can be effectively prevented, and the storage period of the composite packaging adhesive film can be prolonged; therefore, the poly (4-methyl-1-pentene) layer can play a good role in permeation prevention and blocking, and can greatly reduce migration of the polar auxiliary agent in the POE adhesive layer 3 to the first EVA adhesive layer 1 and the second EVA adhesive layer 5.

The embodiment also discloses a photovoltaic module, which comprises a photovoltaic front plate, a first packaging adhesive film, a solar cell, a second packaging adhesive film and a photovoltaic back plate which are sequentially stacked from top to bottom, wherein the first packaging adhesive film and/or the second packaging adhesive film are/is the composite packaging adhesive film described in the embodiment.

Preferably, the photovoltaic front panel and the photovoltaic back panel are both glass plates; the solar cell is a double-sided power generation solar cell. That is, the photovoltaic module of this embodiment is a two-sided dual glass assembly.

While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the invention.

The technical solution provided by the present invention is described in detail above, and the principle and the implementation of the present invention are explained by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A composite packaging adhesive film comprises a first EVA adhesive layer, a POE adhesive layer and a second EVA adhesive layer which are sequentially laminated from top to bottom; its characterized in that is equipped with first prevention of seepage barrier layer between first EVA glue film and the POE glue film, just be equipped with second prevention of seepage barrier layer between POE glue film and the second EVA glue film, first prevention of seepage barrier layer and second prevention of seepage barrier layer are for gathering (4-methyl-1-pentene) layer.

2. The composite packaging adhesive film of claim 1, wherein the poly (4-methyl-1-pentene) layer is a poly (4-methyl-1-pentene) transparent material with a crystallinity of 60-70%.

3. The composite packaging adhesive film according to claim 1 or 2, wherein the poly (4-methyl-1-pentene) layer is made of a poly (4-methyl-1-pentene) transparent material with a visible light transmittance of more than 90%.

4. The composite packaging adhesive film of claim 1, wherein the first and second barrier layers have a thickness of 20-50 μm.

5. The composite encapsulant film as claimed in claim 1, wherein the POE adhesive layer is an ethylene-butylene copolymer adhesive layer.

6. The composite encapsulant film as claimed in claim 1, wherein the thickness of the POE adhesive layer is 150-400 μm.

7. The composite encapsulant film as claimed in claim 1, wherein the thicknesses of the first and second EVA films are 100-300 μm.

8. The composite packaging adhesive film of claim 1, wherein the composite packaging adhesive film is a laminated structure formed by five layers of a first EVA adhesive layer, a first anti-seepage barrier layer, a POE adhesive layer, a second anti-seepage barrier layer and a second EVA adhesive layer through melt co-extrusion molding.

9. A photovoltaic module, comprising a photovoltaic front plate, a first packaging adhesive film, a solar cell piece, a second packaging adhesive film and a photovoltaic back plate which are sequentially stacked from top to bottom, wherein the first packaging adhesive film and/or the second packaging adhesive film is the composite packaging adhesive film of any one of claims 1 to 8.

10. The photovoltaic module of claim 9, wherein the photovoltaic front sheet and the photovoltaic back sheet are both glass sheets; the solar cell is a double-sided power generation solar cell.