CN214991264U

CN214991264U - Packaging adhesive film and photovoltaic module

Info

Publication number: CN214991264U
Application number: CN202120362936.4U
Authority: CN
Inventors: 张浙南; 魏梦娟; 曹明杰; 王富成; 周丹丹
Original assignee: Foster Chuzhou New Material Co ltd
Current assignee: Foster Chuzhou New Material Co ltd
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2021-12-03
Anticipated expiration: 2031-02-08

Abstract

The utility model provides a packaging adhesive film, which is characterized in that the packaging adhesive film is provided with a patterned structure, the patterned structure comprises stripes, a stripe area (10) formed by the stripe groups and a plurality of grid parts (13) formed by the surrounding of the stripes; the strip area (10) is a soft adhesive film layer, the soft adhesive film layer is used for buffering the position of the battery piece in contact with the welding strip, the risk of hidden breakage of the photovoltaic module in the prior art is effectively solved, and meanwhile the appearance problem caused by the use of soft materials can be prevented.

Description

Packaging adhesive film and photovoltaic module

Technical Field

The utility model relates to a photovoltaic field particularly, relates to a packaging adhesive film and photovoltaic module.

Background

With the increasing severity of energy and environmental issues, the utilization of clean and renewable energy is not slow, and among them, the photovoltaic power generation technology has been developed and matured, and the application of photovoltaic cells has been popularized. In the pursuit of high conversion efficiency of solar cells and high output power of modules, in order to further improve the efficiency of the solar cells, people try to adopt thinner main grids and fine grids to increase the effective light receiving area of the cells, and compared with the traditional 4-5 grids, the number of main grid lines of the cells is increased to 6, 9 and 12 so that the number is more. Accordingly, in order to avoid the problem that the welding strip used for connecting the battery pieces in series covers the surface of the battery piece too much, and to ensure that the welding strip has low resistance, a round wire welding strip, i.e. a welding strip with a cylindrical shape, is generally used to connect a plurality of battery pieces in series into a battery string at the present stage. The thickness of the battery cell is also gradually decreasing.

However, compared with the common photovoltaic module, the photovoltaic module applying the above battery technology and module technology has the advantages that the risks of breaking the battery piece, hidden cracking, breaking the grid and the like in the service process are obviously improved, and even the probability of occurrence in the production process of the battery piece or the module is higher.

The packaging material plays a role in adhesion protection and the like in the assembly, and the reliability of the assembly can be improved to a certain extent by using the conventional packaging material such as an EVA (ethylene vinyl acetate) adhesive film. However, reliability issues are not negligible for the new and efficient batteries and components that are conventionally packaged, with more stringent requirements placed on the packaging materials.

The existing packaging material uses a foaming material or an adhesive film with better softness and fluidity as the packaging material to reduce the occurrence of hidden cracks, broken pieces and the like, but simultaneously brings appearance defects of overflow, wrinkles and the like when the assembly is laminated.

Therefore, it is necessary to develop a new adhesive film, which not only has good flexibility for the battery piece and reduces the risk of hidden cracking, but also can prevent the appearance problem caused by the flexible material.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a packaging adhesive film and a photovoltaic module thereof, which can solve the hidden crack fragments of the photovoltaic module in the prior art and the problem of appearance.

In order to achieve the above object, according to one aspect of the present invention, there is provided an encapsulation adhesive film for photovoltaic module encapsulation, comprising a base layer and a patterned layer, wherein the patterned layer comprises a stripe region composed of stripes and a plurality of grid regions surrounded by the stripes; and the stripe area corresponds to the projection position of the welding strip on the cell piece in the photovoltaic module, which is vertical to the plane of the adhesive film.

Furthermore, the stripe area comprises transverse stripes, the transverse stripes are arranged in parallel with the length direction of the solder strip, and the transverse stripes correspond to the projection position of the solder strip on the battery piece, which is vertical to the plane of the packaging adhesive film.

Further, the stripe area comprises longitudinal stripes, the longitudinal stripes are perpendicular to the length direction of the solder strip, and the longitudinal stripes correspond to the projection positions of the gaps between the battery pieces, and the projection positions are perpendicular to the plane of the packaging adhesive film.

Further, the base layer is located below the patterned layer and used for bearing the patterned layer.

Furthermore, the grid area is arranged in a hollow manner, or the grid area is filled with the substrate layer.

Furthermore, the width of the transverse stripe is 0.05-1mm wider than that of the welding strip, and the width of the longitudinal stripe is 1-3mm wider than that of the gap of the battery piece.

Furthermore, the width of the transverse stripes is 0.1-4mm, and the width of the longitudinal stripes is 3-12 mm.

Further, the thickness of the patterned layer is 10-100 μm, and the thickness of the base layer is 10-600 μm.

A photovoltaic module sequentially comprises a first packaging substrate, a front packaging adhesive film, a cell sheet layer, a rear packaging adhesive film and a second packaging substrate from top to bottom, wherein at least one of the front packaging adhesive film and the rear packaging adhesive film is the packaging adhesive film, and a patterned layer of the packaging adhesive film is arranged in contact with the cell sheet layer.

Further, back level encapsulation glued membrane does the utility model discloses patterned encapsulation glued membrane.

Further, the patterned layer is a soft adhesive film layer, and the soft adhesive film layer is a foaming layer or a high-melt-index adhesive film layer.

Further, the foaming layer is an adhesive film layer with a cellular structure.

Further, the high-melt-index adhesive film layer is prepared from EVA or POE particles with the melt index of more than 20g/10 min.

In practical application, the packaging adhesive film can be placed in a photovoltaic module to serve as any one layer or two layers of packaging adhesive films, the transverse stripes on the patterned layer are arranged corresponding to the positions of the solder strips on each cell, and the longitudinal stripes correspond to the positions of gaps between two cells and the solder strips. For the solder strip, the soft adhesive film of the patterned layer can buffer the stress at the solder strip in the laminating process, so that the risk of hidden cracking and breaking is reduced.

Therefore, the packaging adhesive film can buffer the stress of the position of the solder strip on the cell in the laminating process, a local patterning structure is adopted, the use of soft materials can be reduced, the influence on the appearance of the assembly caused by overlarge fluidity of the soft adhesive film is prevented, the cost can be reduced, and the problems of hidden cracking of the cell and poor appearance of the assembly of the photovoltaic assembly in the prior art are effectively solved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a top view of a packaging adhesive film structure according to an embodiment of the present invention;

fig. 2 shows a top view of a packaging adhesive film structure according to another embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the packaging adhesive film structure of FIG. 1 along the A-A' direction;

FIG. 4 is a schematic cross-sectional view of the packaging adhesive film structure of FIG. 1 along the direction B-B';

FIG. 5 is a schematic cross-sectional view of the packaging adhesive film structure of FIG. 1 along the A-A' direction;

FIG. 6 is a schematic cross-sectional view of the packaging adhesive film structure of FIG. 1 along the direction B-B';

fig. 7 shows a schematic structural view of a photovoltaic module according to an embodiment of the present invention;

fig. 8 shows a specific structural schematic diagram at the photovoltaic module structure C shown in fig. 7.

Wherein the figures include the following reference numerals:

1. the packaging structure comprises a rear packaging adhesive film, 2, a battery layer, 3, a front adhesive film layer, 4, a first packaging substrate, 5 and a second packaging substrate;

10. stripe zone, 11, first stripe zone, 111, first stripe group, 112, second stripe group, 113, third stripe group, 1111, first transverse stripe, 1112, second transverse stripe, 1113, third transverse stripe, 1114, fourth transverse stripe, 12, second stripe zone, 121, first longitudinal stripe, 122, second longitudinal stripe, 123, third longitudinal stripe, 124, fourth longitudinal stripe, 125, fifth longitudinal stripe, 13, base layer.

21. Battery piece, 22, solder strip.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As described in the background section, there is a risk of subfraction during the lamination of photovoltaic modules in the prior art, as well as appearance problems due to the high flowability of the soft material.

In order to solve the above problems, the present invention provides a packaging adhesive film,

as shown in fig. 1 and 8, the packaging adhesive film has a patterned structure, where the patterned structure includes a stripe region 10 formed by a plurality of horizontal stripes and longitudinal stripes, specifically, for example, a first horizontal stripe 1111, a second horizontal stripe 1112, a third horizontal stripe 1113, and a fourth horizontal stripe 1114, where each horizontal stripe corresponds to a position where a single solder strip is located on the battery sheet, the plurality of horizontal stripes form a first stripe group 111, and similarly, the patterned structure further includes a second stripe group 112 and a third stripe group 113, where each stripe group corresponds to a position region where all solder strips are located on a single string of battery, the plurality of stripe groups form a first stripe region 11, and the first stripe region 11 corresponds to a position region where all solder strips are located on the battery sheet. The longitudinal stripes, specifically, for example, include a first longitudinal stripe 121, a second longitudinal stripe 122, a third longitudinal stripe 123, a fourth longitudinal stripe 124, and a fifth longitudinal stripe 125, where the longitudinal stripes are arranged perpendicular to the stripes, each longitudinal stripe corresponds to a cell gap where edges of every two adjacent rows of cells contacting with the solder strip are located, the plurality of longitudinal stripes form a second stripe region 12, and the second stripe region 12 corresponds to a cell gap where edges of all cells contacting with the solder strip are located. The first stripe region 11 and the second stripe region 12 form a stripe region 10 of a local soft adhesive film, and the stripe region is used for being in contact with a position of a welding strip 21 on the battery layer 2 and a contact region of a battery piece and the welding strip, and is used for providing buffering, reducing stress between the welding strip and the battery piece during lamination, and further reducing the occurrence of hidden cracks.

As another embodiment, as shown in fig. 2, the second stripe region 12 can be omitted, so as to simplify the adhesive film preparation process and reduce the cost.

As an implementation manner, as shown in fig. 3-4, the grid part 13 is a hollow structure, the stripe region 10 is composed of a first stripe region 11 and a second stripe region 12, the stripe region is a soft adhesive film layer, is a single layer, and is attached to the surface of the substrate layer 13, the substrate layer 13 is used for bearing a soft adhesive film, and the substrate layer 13 and the soft adhesive film layer are of a two-layer structure and constitute the packaging adhesive film.

As another embodiment, as shown in fig. 5 to 6, the grid area 13 is a base layer, the base layer is located in the grid area surrounded by the stripe area 10, and the base layer and the flexible adhesive film layer are of a single layer structure and constitute the packaging adhesive film.

Like this, when practical application, can arrange this encapsulation glued membrane in photovoltaic module arbitrary one deck encapsulation glued membrane, the stripe that will include soft glued membrane layer corresponds on each battery piece and the position setting of solder strip contact, the grid portion that includes the stratum basale then corresponds the regional setting that is not covered by soft glued membrane layer, soft glued membrane layer is used for providing the buffering, stress between solder strip and the battery piece during the reduction lamination, thereby reduce the emergence of latent crack, adopt the setting of patterning structure with soft glued membrane simultaneously, the content of the soft glued membrane layer of high mobility has been reduced, thereby the outward appearance problem that conventional soft glued membrane layer mobility is too high thereby overflowing and lead to in the lamination process has been reduced.

Specifically, as shown in fig. 7, a photovoltaic module using the encapsulation adhesive film shown in fig. 1 includes, from top to bottom, a first encapsulation substrate 4, a front encapsulation adhesive film 3, a battery layer 2, a rear encapsulation adhesive film 1 and a second encapsulation substrate 5, where the rear encapsulation adhesive film 1 is the above local soft adhesive film and is located below the battery layer 2.

As shown in fig. 8, a partial enlarged view of a structure C of the battery layer 2 in contact with the back-layer packaging adhesive film 1 specifically, the battery layer 2 includes a battery piece 21 and a welding strip 22 for overlapping two adjacent battery pieces up and down, and a plurality of welding strips are arranged on every two adjacent battery pieces. The back layer encapsulation glued membrane 1 is local soft glued membrane, including the stratum basale and the soft glued membrane layer of setting on the stratum basale, soft glued membrane layer is including first stripe district 11 and second stripe district 12, horizontal stripe on the first stripe district 11 sets up along solder strip 22 direction to contact with solder strip 22, cover solder strip 22 that is located the battery piece 21 below, thereby provide the buffering when the subassembly is laminated, vertical stripe on the second stripe district 12 sets up along two battery pieces clearance direction at the edge place of the battery piece of solder strip 22 and battery piece 21 contact, and cover all and the battery piece edge in 21 below and the clearance of the edge that solder strip 22 contacted.

It should be noted that the material of the above-mentioned substrate layer may be a material known in the art, such as common EVA, POE, etc. adhesive films.

The material of the soft adhesive film layer is also known in the art as long as it has the functions of softness and the like, for example, the adhesive film for packaging a photovoltaic module with a multi-layer structure in patent CN202010648661.0 may be adopted, and includes a three-layer structure including an upper adhesive layer, a foaming layer and a lower adhesive layer, where the foaming layer is located between the upper adhesive layer and the lower adhesive layer; the upper bonding layer and the lower bonding layer are both composed of 100 parts by weight of bonding layer main body material and 0.1-15 parts by weight of auxiliary agent, and the foaming layer is composed of 100 parts by weight of foaming layer main body material, 0.1-15 parts by weight of auxiliary agent and 0.1-10 parts by weight of foaming agent; the auxiliary agent of at least one layer of the three-layer structure contains 0.01-3 parts by weight of peroxide, and further, the thickness of the foaming layer is 20-800 mu m, the diameter of a foam hole is 5-500 mu m, the foam hole rate is 10-80%, and the pre-crosslinking degree of the foaming layer is 5-80%.

In the actual operation process, the substrate layer and the soft adhesive film layer are only required to be compounded after being manufactured according to the required structure. The specific composite form includes but is not limited to one or a combination of a plurality of sticking and co-extrusion.

In a preferred embodiment, as shown in fig. 7, the photovoltaic module further includes a front-layer adhesive packaging film 3 located above the battery layer 2, and the front-layer adhesive packaging film 3 is a transparent adhesive film.

In a preferred embodiment, the photovoltaic module further comprises a first encapsulation substrate 4 located above the front layer encapsulation adhesive film 3. Specifically, the first package substrate 4 is preferably a glass substrate.

In a preferred embodiment, the photovoltaic module further comprises a second encapsulation substrate 5 located below the back-layer encapsulation adhesive film 1. The second package substrate 5 may be a glass substrate or a white back plate.

The following examples further illustrate the beneficial effects of the present invention:

example 1

A packaging adhesive film comprises a soft adhesive film layer with the thickness of 50 micrometers and a substrate layer 13 with the thickness of 300 micrometers, wherein the substrate layer 13 is arranged below the soft adhesive film layer, the soft adhesive film layer corresponds to a gap between the position of a welding strip on a battery piece and the edge of the battery piece contacted with the welding strip, the width of a transverse stripe of the soft adhesive film layer is 2mm, and the width of a longitudinal stripe of the soft adhesive film layer is 7 mm.

The soft adhesive film layer is an adhesive film for packaging a photovoltaic module with a multilayer structure in patent CN 202010648661.0.

The base layer 13 is made of conventional EVA adhesive film.

A sample preparation process: the sample is prepared according to the structure of the solar component, and the sample is prepared by sequentially laminating from top to bottom ultra-white glass, a transparent EVA (ethylene vinyl acetate) adhesive film, a double-sided battery piece, a packaging adhesive film (embodiment 1) and a back panel (KPK) by using a laminating machine at the temperature of 145 ℃ and the vacuumizing time of 6min for 10 min. And the appearance of the assembly is observed, and the appearance problem of glue overflow on the battery piece is not found.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An encapsulation adhesive film for photovoltaic module encapsulation, comprising a base layer and a patterned layer, characterized in that the patterned layer comprises a stripe region (10) composed of stripes and a plurality of grid regions (13) surrounded by the stripes; the stripe area (10) corresponds to the projection position of a solder strip on a battery piece in the photovoltaic module, wherein the projection position is vertical to the plane of a packaging adhesive film.

2. The packaging adhesive film according to claim 1, wherein: the stripe area (10) comprises transverse stripes, the transverse stripes are arranged in parallel with the length direction of the solder strip, and the transverse stripes correspond to the projection position of the solder strip on the battery piece, which is vertical to the plane of the packaging adhesive film.

3. The packaging adhesive film of claim 2, wherein: the stripe area (10) comprises longitudinal stripes, the longitudinal stripes are perpendicular to the length direction of the solder strip, and the longitudinal stripes correspond to the projection positions of the gaps among the battery pieces, and the projection positions are perpendicular to the plane of the packaging adhesive film.

4. The packaging adhesive film according to claim 1, wherein: the base layer is located below the patterning layer and used for bearing the patterning layer, and the grid area (13) is arranged in a hollow mode or is filled by the base layer.

5. The packaging adhesive film according to claim 3, wherein: the width of the transverse stripe is larger than that of the welding strip, and the width of the longitudinal stripe is larger than that of the gap of the battery piece.

6. The packaging adhesive film according to claim 5, wherein: the width of the transverse stripe is 0.05-1mm wider than that of the welding strip, and the width of the longitudinal stripe is 1-3mm wider than that of the gap of the battery piece.

7. The packaging adhesive film of claim 6, wherein: the width of the transverse stripes is 0.1-4mm, and the width of the longitudinal stripes is 3-12 mm.

8. The packaging adhesive film according to any one of claims 1 to 7, wherein the thickness of the patterned layer is 10-100 μm, and the thickness of the base layer is 10-600 μm.

9. A photovoltaic module comprises a first packaging substrate (4), a front packaging adhesive film (3), a cell layer (2), a rear packaging adhesive film (1) and a second packaging substrate (5) from top to bottom in sequence, wherein at least one of the front packaging adhesive film (3) and the rear packaging adhesive film (1) is the packaging adhesive film as claimed in any one of claims 1 to 8, and a patterned layer of the packaging adhesive film is arranged in contact with the cell layer (2).