CN218241865U

CN218241865U - Packaging adhesive film and photovoltaic module

Info

Publication number: CN218241865U
Application number: CN202222627109.0U
Authority: CN
Inventors: 朱雅芝; 桑燕
Original assignee: Foster Chuzhou New Material Co ltd
Current assignee: Foster Chuzhou New Material Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-01-06
Anticipated expiration: 2032-09-30

Abstract

The application belongs to the technical field of photovoltaic. The application discloses encapsulation glued membrane, it includes glued membrane body and anti-overflow portion. The glued membrane body extends along first direction, and the both sides of glued membrane body are located along first direction to anti-overflow portion. The anti-overflow portion includes thickening district and attenuate district, and the thickness in thickening district is greater than the thickness of glued membrane body, and the thickness in attenuate district is less than the thickness in thickening district, and thickening district sets up along first direction interval with attenuate district. The application also discloses a photovoltaic module, includes front substrate, front encapsulation glued membrane, battery lamella, back level encapsulation glued membrane and back layer base plate in proper order, and back level encapsulation glued membrane is above-mentioned encapsulation glued membrane. The photovoltaic technology field is applied to this application, and the problem of excessive gluey of glued membrane can be solved to the encapsulation glued membrane in this application, has improved photovoltaic module yields, production efficiency and life.

Description

Packaging adhesive film and photovoltaic module

Technical Field

The utility model belongs to the technical field of the photovoltaic, especially, relate to a packaging adhesive film and photovoltaic module.

Background

In recent years, with the release of favorable policies such as 'fourteen-five' planning and the like in China, under the large background of 'carbon neutralization', green new energy is rapidly popularized and developed. The photovoltaic industry is one of the most important development directions in the development of new energy.

The packaging adhesive film is used as a bonding material in the solar cell module, so that glass, the cell piece and the back plate can be effectively bonded into a whole, and the cell piece is protected. However, the problems of delamination, bubbles, splinters, slippage, and glue overflow occur in the current process of packaging adhesive film production, wherein glue overflow is the most common. In the prior art, the problem of glue overflow is generally solved by filling small strips around a glue film.

However, in the process of implementing the technical solution applied in the embodiment of the present application, the applicant finds that the above-mentioned technology has at least the following technical problems:

through the processing mode of filling up the small strip around the glued membrane, although can alleviate the excessive gluey problem of encapsulation glued membrane, need add in the preparation process and cut the processes such as small strip and artifical laying the small strip, production efficiency is lower, and lay the small strip and probably can make the middle gas of subassembly or auxiliary agent difficult to discharge, produce bad problems such as bubble.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a packaging adhesive film, solves the problem of glue overflow during the lamination of the packaging adhesive film, avoids the adhesive film from generating other defects, ensures the service life of a photovoltaic module, and improves the production efficiency.

One aspect of the present application provides a packaging adhesive film, which includes an adhesive film body and an anti-overflow portion; the glued membrane body extends along the first direction, and the both sides of glued membrane body are located along the first direction to anti-overflow portion, and anti-overflow portion includes thickening district and attenuate district, and the thickness in thickening district is greater than the thickness of glued membrane body, and the thickness in attenuate district is less than the thickness in thickening district, and thickening district sets up along the first direction interval with the attenuate district.

Further, the width of the spill prevention part is more than or equal to 5mm and less than or equal to 20mm.

Further, in the first direction, a ratio of a length of the thickened region to a length of the thinned region is 2 or more and 5 or less.

Furthermore, the ratio of the thickness of the thickening region to the thickness of the adhesive film body is greater than or equal to 1.5 and less than or equal to 3.

Further, the ratio of the thickness of the thinning area to the thickness of the adhesive film body is greater than or equal to 0.25 and less than or equal to 2.

Further, the ratio of the thickness of the thinning area to the thickness of the thickening area is greater than or equal to 1/6 and less than or equal to 2/3.

Further, a second direction is defined, the second direction is perpendicular to the first direction and parallel to the adhesive film body, a plane perpendicular to the second direction is taken as a first plane, the thickened area has a first projection in the first plane along the second direction, and the shape of the first projection comprises at least one of a rectangle, a triangle, a trapezoid or an arc.

Further, a second direction is defined, the second direction is perpendicular to the first direction and parallel to the adhesive film body, a plane perpendicular to the second direction is taken as a first plane, along the second direction, the thinning area has a second projection in the first plane, and the shape of the second projection includes at least one of a rectangle, a triangle, a trapezoid or an arc.

Further, a second direction is defined, the second direction is perpendicular to the first direction and parallel to the adhesive film body, a plane perpendicular to the second direction is taken as a first plane, the thickened area has a first projection in the first plane along the second direction, the thinned area has a second projection in the first plane, and the area ratio of the first projection to the second projection is greater than or equal to 1.

Another aspect of the present application further provides a photovoltaic module, which includes a front substrate, a front adhesive film, a battery string, a rear adhesive film, and a rear substrate; at least one of the front layer adhesive film or the back layer adhesive film is selected from the packaging adhesive film.

The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

1. the packaging adhesive film in the application adopts a structural design with a thin middle part and thick two sides, so that the problem of adhesive overflow of the packaging adhesive film is solved, and the edge retention rate of the laminated photovoltaic module is improved.

2. The packaging adhesive film in the application is provided with the thinning area, so that the photovoltaic module has better edge retention rate after being laminated, the number of air holes of the packaging adhesive film is reduced, and the yield and the service life of the module are improved.

Drawings

FIG. 1 is a schematic plan view of one embodiment of a packaging adhesive film according to the present application;

FIG. 2 isbase:Sub>A cross-sectional projection view of the packaging film of FIG. 1 taken along the line A-A;

FIG. 3 is a cross-sectional projection view of the packaging film of FIG. 1 taken along the direction B-B;

FIG. 4 is another cross-sectional projection view taken along the direction B-B of the packaging adhesive film in FIG. 1;

FIG. 5 is another cross-sectional projection view taken along the direction B-B of the packaging adhesive film in FIG. 1;

FIG. 6 is another cross-sectional projection view taken along the direction B-B of the packaging adhesive film in FIG. 1;

FIG. 7 is a schematic cross-sectional view of a photovoltaic module according to the present application;

FIG. 8 is a schematic cross-sectional view showing a packaging adhesive film in comparative example 1;

FIG. 9 is a schematic plan view showing the structure of the packaging adhesive film in comparative example 2;

fig. 10 is a sectional projection view taken along the direction C-C of the packaging adhesive film of fig. 9.

In the figure: a packaging adhesive film 100, an adhesive film body 11, an anti-overflow part 12, a thickening region 121, and a thinning region 122; the photovoltaic module 200, a front substrate 21, a front packaging adhesive film 22, a battery sheet layer 23, a rear packaging adhesive film 24 and a rear substrate 25; a first direction 101 and a second direction 102.

Detailed Description

In order to make the technical solutions of the embodiments of the present application better understood, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

The problems of delamination, bubbles, splinters, slipping, glue overflow and the like can occur when the packaging adhesive film is applied to the photovoltaic module, wherein the glue overflow problem is the most common, and the problems can greatly influence the power generation efficiency and the service life of the photovoltaic module. The main reason for the overflow of glue is that the softened glue film overflows from the edge due to the large edge extrusion force of the laminating machine during the lamination process. The embodiment of the application provides a encapsulation glued membrane with anti-overflow portion has improved the buffer capacity of encapsulation glued membrane edge, can alleviate the pressure that the edge received, makes the whole atress of subassembly even. The problem of excessive gluey of encapsulation glued membrane when photovoltaic module lamination has been solved to encapsulation glued membrane in this application, has improved photovoltaic module roughness and edge conservation rate, has guaranteed photovoltaic module's life.

The embodiment of the present application provides a packaging adhesive film 100, as shown in fig. 1, which includes an adhesive film body 11 and an anti-overflow part 12. Wherein the glue film body 11 extends along the first direction 101, and the anti-overflow part 12 is disposed on two sides of the glue film body 11 along the first direction 101. The overflow preventing part 12 includes a thickening region 121 and a thinning region 122, a thickness H1 of the thickening region 121 is greater than a thickness H2 of the adhesive film body 11, a thickness H3 of the thinning region 122 is less than the thickness H1 of the thickening region 121, and the thickening region 121 and the thinning region 122 are arranged at intervals along the first direction 101. The thickening area and the thinning area are mutually matched to form air holes, and air bubbles generated in the adhesive film can be discharged from the thinning area during lamination. The thickness H3 of the thinning area 122 may be equal to the thickness H2 of the adhesive film body 11, or may be greater than the thickness H2 of the adhesive film body 11 or less than the thickness H2 of the adhesive film body 11. The glue film body 11 is used for bonding the central area of the photovoltaic module, so that the module becomes a whole with certain structural strength. The excessive glue of encapsulation glued membrane is because photovoltaic module is when the lamination, and encapsulation glued membrane 100 softens the melting under the high temperature effect, has certain mobility, and the laminator is greater than the pressure of center department to the pressure at photovoltaic module edge, can extrude the glued membrane at edge, leads to excessive glue. To the photovoltaic module of single glass structure, the bending stress of back floor's base plate is less, can bending deformation downwards when back floor's base plate edge receives great pressure, makes the gluey volume of encapsulation glued membrane 100 edges spill over, takes place to overflow and glues. After lamination, the edge position of the assembly of the single glass structure tends to be closer to the edge and lower in thickness due to glue film overflow. To dual glass assembly, its back substrate is the glass backplate, and although the bending stress of glass backplate is great, is difficult for taking place the bending under the normal atmospheric temperature, but the glass backplate softens under the high temperature, still can take place bending deformation, makes the volume of gluing of encapsulation glued membrane 100 edges spill over, appears overflowing gluey. And after the photovoltaic module of double glass structure lamination cooling, the bending stress of glass backplate resumes, and package glued membrane 100 edge can appear the bubble or come unstuck scheduling problem. The application has set up anti-overflow portion in packaging adhesive film 100, and anti-overflow portion 12 is used for bonding the subassembly marginal region, can prevent simultaneously that the excessive glue in packaging adhesive film edge is glued, and it includes thickening region 121 and thinning region 122. The thickened area 121 buffers a larger pressure at the edge during lamination by increasing the thickness, so as to reduce glue overflow, and can also be used for supplementing a glue lacking area, so that the packaging glue film 100 is kept complete. The thinning region 122 can cooperate with the thickening region 121 to form air holes to exhaust the gas in the adhesive film body, and meanwhile, the package adhesive film 100 is ensured not to generate more bubbles due to the thickness difference between the thickening region 121 and the adhesive film body 11.

As an embodiment, as shown in fig. 2, in a direction perpendicular to the first direction 101, the width W1 of the spill preventing portion 12 is equal to or greater than 5mm and equal to or less than 20mm. The width of the spill guard needs to be adapted to the model of the particular photovoltaic module. If the width W1 of the anti-overflow portion 12 is too small, the anti-overflow portion 12 may not completely cover the area with higher pressure of the laminating machine, the packaging adhesive film 100 may still be hidden and cracked during lamination, and the anti-overflow portion 12 does not have enough glue amount to compensate the glue-lacking area, and it is not guaranteed that the packaging adhesive film 100 has a good edge retention rate. The ratio of the width W1 of the anti-overflow portion 12 is too large, the edge retention rate of the module cannot be obviously improved by increasing the width W2 of the anti-overflow portion 12 on the premise of not changing the adhesive film body 11, and excessive adhesive amount can be discharged into the laminating machine, which affects the production efficiency of the module. The width of the spill-proof part is basically 0.5 to 1 times of the distance from the edge of the battery piece to the edge of the packaging adhesive film in the assembly. The width of the width W1 of the anti-overflow portion 12 is kept within the above range, and this requirement can be satisfied, which not only enables the component to have a better edge retention rate, improves the yield, but also avoids the waste of materials, and simultaneously enables the production process to be cleaner, and improves the production efficiency.

As an embodiment, as shown in fig. 3, in the first direction 101, a ratio of a length L1 of the thickened region 121 to a length L2 of the thinned region 122 is greater than or equal to 2 and less than or equal to 5. The shorter the length of the thickening region 121 is, the larger the air holes formed by the thickening region 121 and the thinning region 122 are, so that the air in the packaging adhesive film 100 can have enough space to be discharged, and the bubbles in the packaging adhesive film 100 can be effectively reduced. The longer the length of the growth region 121 is, the better the cushioning effect is, and the flash of glue can be prevented while other components can be protected. The longer the thickening region 121 is, the more the gap the thickening region 121 can fill during lamination, and the sufficient amount fills the thinning region 122, so that the packaging adhesive film 100 is completely bubble-free and has a good thickness retention rate at the edge. The ratio of the length L1 of the thickening region 121 to the length L2 of the thinning region 122 is kept in the above range, so that the large pressure at the edge can be effectively balanced, glue overflow is prevented, bubbles in the packaging glue film 100 can be reduced, the thickness retention rate at the edge of the packaging glue film 100 is improved, the glue film is more complete, the strength is higher, and the service life is prolonged.

In one embodiment, a ratio of the thickness H1 of the thickening region 121 to the thickness H2 of the adhesive film body 11 is greater than or equal to 1.5 and less than or equal to 3. The thickened area 121 serves to cushion the edge from higher pressure during lamination and also to compensate for the area of glue loss. The ratio of the thickness H1 of the thickening region 121 to the thickness H2 of the adhesive film body 11 is too small, so that the thickening region 121 cannot effectively alleviate the larger pressure at the edge of the laminating machine, the thickness of the laminated adhesive film is uneven, the high thickness retention rate of the packaging adhesive film 100 cannot be ensured, meanwhile, the thickening region 121 cannot be ensured to have enough adhesive amount to compensate the adhesive shortage region, and the integrity of the laminated packaging adhesive film 100 cannot be ensured. The ratio of the thickness H1 of the thickening region 121 to the thickness H2 of the adhesive film body 11 is too large, which causes waste of raw materials. Therefore, the thickness H1 of the thickening region 121 and the thickness H2 of the adhesive film body 11 are kept within the above range, which not only can alleviate the higher pressure at the edge and reduce the occurrence of glue overflow, but also can compensate the glue shortage region, so that the edge of the packaging adhesive film 100 has a better thickness retention rate, and simultaneously, the waste of raw materials is avoided and the yield is kept.

In one embodiment, the ratio of the thickness H3 of the thinning region 122 to the thickness H2 of the adhesive film body 11 is greater than or equal to 0.25 and less than or equal to 2. The ratio of the thickness H2 of the adhesive film body 11 to the thickness H3 of the thinning area 122 is too large, which may cause the thinning area 122 to have insufficient space to discharge the bubbles in the packaging adhesive film 100, and the packaging adhesive film 100 still has the possibility of bubbles. The ratio of the thickness H2 of the film body 11 to the thickness H3 of the thinning area 122 is too small, which may cause the thinning area 122 not to be filled with the thickening area 121 during lamination, resulting in defects of air holes or uneven film edges after lamination of the packaging film 100. Therefore, the ratio of the thickness H2 of the adhesive film body 11 to the thickness H3 of the thinning area 122 is kept in the above range, so that the thinning area 122 can perform a good bubble-discharging function, and the yield of the packaging adhesive film 100 can be ensured.

In one embodiment, the ratio of the thickness H3 of the thinning-out region 122 to the thickness H1 of the thickening region 121 is greater than or equal to 1/6 and less than or equal to 2/3. The thinning area 122 and the thickening area 121 are arranged on two sides of the adhesive film body 11 at intervals, and the thinning area 122 can discharge bubbles of the adhesive film body 11 and the thickening area 121 and also plays a role in connecting and fixing the thickening area 121. The ratio of the thickness H1 of the thickened area 121 to the thickness H3 of the thinned area 122 is too large, which may cause the thinned area 122 to have insufficient space to exhaust the bubbles in the packaging adhesive film 100, and the packaging adhesive film 100 may still have bubbles. The ratio of the thickness H1 of the thickened region 121 to the thickness H3 of the thinned region 122 is too small, so that the thickened region 121 is not stressed stably in the transverse direction, the thickened region 121 is laterally deviated, and the large pressure at the edge of the laminating machine during the laminating process cannot be well relieved. The ratio of the thickness H1 of the thickened region 121 to the thickness H3 of the thinned region 122 is kept in the above range, so that the structures of the thickened region 121 and the thinned region 122 are more stable, and the anti-overflow function and the air bubble discharge function of the anti-overflow part 12 can be better exerted.

As an embodiment, a second direction 102 (as shown in fig. 1) is defined, the second direction 102 is perpendicular to the first direction and the second direction 102 is parallel to the film body, a plane perpendicular to the second direction 102 is taken as a first plane, and along the second direction 102, the thickened region 121 has a first projection in the first plane, i.e. a cross-sectional projection view seen from a direction B-B in fig. 1. The shape of the first projection includes at least one of a rectangle (as shown in fig. 3), a triangle (as shown in fig. 4), an arc (as shown in fig. 5), or a trapezoid (as shown in fig. 6). The thickened area 121 mainly buffers the larger pressure around the laminator during lamination through higher thickness, thereby reducing glue overflow, so that the shape of the thickened area 121 does not influence the glue overflow prevention effect. During lamination, the thickened area 121 gradually tends to be flat when being pressed, the surplus glue originally filling the thinned area 122 and compensating the loss of glue overflow can be obtained, and the shape of the thickened area 121 can be selected according to actual requirements.

As an embodiment, a second direction 102 (as shown in fig. 1) is defined, the second direction 102 is perpendicular to the first direction and the second direction 102 is parallel to the film body, a plane perpendicular to the second direction 102 is taken as a first plane, and along the second direction 102, the thinning-out region 122 has a second projection in the first plane, i.e. a cross-sectional projection view seen from a direction B-B in fig. 1. The shape of the second projection includes at least one of a rectangle (as shown in fig. 3), a triangle (as shown in fig. 4), a fan (as shown in fig. 5), or a trapezoid (as shown in fig. 6). The thinning-out region 122 is mainly used for exhausting gas possibly existing in the main body of the adhesive film and the thickening region 121, and the shape thereof is not limited. During the lamination process, the thinning region 122 is filled with the thickening region 121, and the shape of the thinning region 122 can be selected according to actual requirements.

In addition, the shapes of the first projection and the second projection may be the same or different. For the special cases as shown in fig. 3 (the special case where the first projection and the second projection are both triangular and the oblique sides of the two regions are on a straight line) and fig. 6 (the first projection and the second projection are both triangular and the oblique sides of the two regions are on a straight line), the thickening region and the thinning region are divided by a plane parallel to the encapsulant film and having a distance a from the bottom surface of the encapsulant film, where a = (H1 + H3)/2, H1 is the thickness of the thickening region 121, and H3 is the thickness of the thinning region 122.

As an embodiment, a second direction 102 (as shown in fig. 1) is defined, the second direction 102 is perpendicular to the first direction and the second direction 102 is parallel to the film body, a plane perpendicular to the second direction 102 is taken as a first plane, along the second direction 102, the thickened region 121 has a first projection in the first plane, and the thinned region 122 has a second projection in the first plane, i.e., a cross-sectional projection view seen from a direction B-B in fig. 1. The ratio of the areas of the first projection and the second projection is greater than or equal to 1. The widths of the thickened area 121 and the thinned area 122 are the same as the width W2 of the anti-overflow part 12, and when the width W2 of the anti-overflow part 12 is constant, the widths of the thickened area 121 and the thinned area 122 are also constant, at this time, the first projection represents the amount of glue film which is excessive in the thickened area 121, and the second projection represents the amount of glue which is insufficient in the thinned area 122. An excessively small area ratio of the first projection to the second projection may result in insufficient glue in the thickened area 121, and cannot simultaneously fill the thinned area 122 and replenish the glue lost due to glue overflow. An excessively large area ratio of the first projection to the second projection results in a waste of raw material. The area ratio of the first projection to the second projection is kept in the range, the glue overflow problem can be solved by using less raw materials, and the production efficiency is improved.

The application also provides a photovoltaic module 200 as shown in fig. 7, which sequentially comprises a front substrate 21, a front packaging adhesive film 22, a cell layer 23, a rear packaging adhesive film 24 and a rear substrate 25. The front or rear packaging adhesive film 24 is the packaging adhesive film 100, and is located below the battery sheet layer 23 and above the rear substrate 25, and the flat part of the packaging adhesive film 100 is attached to the surface of the battery sheet layer 23.

The present application is further described with reference to the following examples, but the scope of protection of the present application is not limited to the examples.

Example 1

As shown in fig. 1, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow portion 12. Wherein the glue film body 11 extends along the first direction 101, and the anti-overflow part 12 is disposed on two sides of the glue film body 11 along the first direction 101. The spill prevention portion 12 includes a thickened region 121 and a thinned region 122, and the thickened region 121 and the thinned region 122 are disposed at an interval in the first direction 101. As shown in fig. 3, a plane perpendicular to the transverse direction of the adhesive packaging film 100 is taken as a first plane, and in the transverse direction, the thickened area 121 has a first projection in the first plane, and the thinned area has a second projection in the first plane. The first projection is rectangular and the second projection is rectangular.

Specifically, the width W2 of the glue film body 11 is 104.00cm, and the thickness H2 is 0.40cm; the width W1 of the spill-proof part 12 is 1.20cm; the thickness H1 of the thickened area 121 is 0.70cm, the length L1 is 5.00cm, and the ratio of the area of the first projection to the area of the second projection is 35:3; the thinned region 122 has a thickness H3 of 0.30cm and a length L2 of 1.00cm.

Example 2

As shown in fig. 1, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow part 12. Wherein the glue film body 11 extends along the first direction 101, and the anti-overflow part 12 is disposed on two sides of the glue film body 11 along the first direction 101. The spill prevention portion 12 includes a thickened region 121 and a thinned region 122, and the thickened region 121 and the thinned region 122 are disposed at an interval in the first direction 101. As shown in fig. 3, a plane perpendicular to the transverse direction of the packaging adhesive film 100 is taken as a first plane, and in the transverse direction, the thickened area 121 has a first projection in the first plane, and the thinned area has a second projection in the first plane. The first projection is rectangular and the second projection is rectangular.

Specifically, the width W2 of the glue film body 11 is 104.00cm, and the thickness H2 is 0.40cm; the width W1 of the spill prevention part 12 is 1.20cm; the thickness H1 of the thickened area 121 is 0.70cm, the length L1 is 5.00cm, and the ratio of the area of the first projection to the area of the second projection is 8.75:1; the thinned region 122 has a thickness H3 of 0.40cm and a length L2 of 1.00cm.

Example 3

Specifically, the width W2 of the glue film body 11 is 104.00cm, and the thickness H2 is 0.60cm; the width W1 of the spill prevention part 12 is 1.20cm; the thickness H1 of the thickened area 121 is 1.20cm, the length L1 is 4.00cm, and the ratio of the area of the first projection to the area of the second projection is 7.5:1; the thinned region 122 has a thickness H3 of 0.80cm and a length L2 of 0.80cm.

Example 4

As shown in fig. 1, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow part 12. Wherein the glue film body 11 extends along the first direction 101, and the anti-overflow part 12 is disposed on two sides of the glue film body 11 along the first direction 101. The spill prevention portion 12 includes a thickened region 121 and a thinned region 122, and the thickened region 121 and the thinned region 122 are spaced apart from each other along the first direction 101. As shown in fig. 3, a plane perpendicular to the transverse direction of the packaging adhesive film 100 is taken as a first plane, and in the transverse direction, the thickened area 121 has a first projection in the first plane, and the thinned area has a second projection in the first plane. The first projection is rectangular and the second projection is rectangular.

Specifically, the width W2 of the glue film body 11 is 104.00cm, and the thickness H2 is 0.60cm; the width W1 of the spill prevention part 12 is 1.20cm; the thickness H1 of the thickened area 121 is 1.80cm, the length L1 is 4.00cm, and the ratio of the area of the first projection to the area of the second projection is 7.5:1; the thinned region 122 has a thickness H3 of 1.20cm and a length L2 of 0.80cm.

Example 5

As shown in fig. 1, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow portion 12. The glue film body 11 extends along a first direction 101, and the overflow preventing portions 12 are disposed on two sides of the glue film body 11 along the first direction 101. The spill prevention portion 12 includes a thickened region 121 and a thinned region 122, and the thickened region 121 and the thinned region 122 are spaced apart from each other along the first direction 101. As shown in fig. 4, a plane perpendicular to the transverse direction of the packaging adhesive film 100 is taken as a first plane, and in the transverse direction, the thickened area 121 has a first projection in the first plane, and the thinned area has a second projection in the first plane. The first projection is a triangle and the second projection is a triangle.

Specifically, the width W2 of the glue film body 11 is 104.00cm, and the thickness H2 is 0.60cm; the width W1 of the spill prevention part 12 is 1.20cm; the thickness H1 of the thickening region 121 is 1.20cm, the length L1 is 4.00cm, and the ratio of the area of the first projection to the area of the second projection is 45:4; the thinned region 122 has a thickness H3 of 0.20cm and a length L2 of 0.80cm.

Example 6

As shown in fig. 1, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow portion 12. Wherein the glue film body 11 extends along the first direction 101, and the anti-overflow part 12 is disposed on two sides of the glue film body 11 along the first direction 101. The spill prevention portion 12 includes a thickened region 121 and a thinned region 122, and the thickened region 121 and the thinned region 122 are disposed at an interval in the first direction 101. As shown in fig. 5, a plane perpendicular to the transverse direction of the packaging adhesive film 100 is taken as a first plane, and in the transverse direction, the thickened area 121 has a first projection in the first plane, and the thinned area has a second projection in the first plane. The first projection is fan-shaped and the second projection is fan-shaped.

Specifically, the width W2 of the glue film body 11 is 104.00cm, and the thickness H2 is 0.60cm; the width W1 of the overflow preventing part 12 is 1.0cm; the thickness H1 of the thickened area 121 is 0.90cm, the length L1 is 0.60cm, and the ratio of the area of the first projection to the area of the second projection is 7.56:1; the thinned region 122 has a thickness H3 of 0.54cm and a length L2 of 0.12cm.

Example 7

As shown in fig. 1, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow part 12. Wherein the glue film body 11 extends along the first direction 101, and the anti-overflow part 12 is disposed on two sides of the glue film body 11 along the first direction 101. The spill prevention portion 12 includes a thickened region 121 and a thinned region 122, and the thickened region 121 and the thinned region 122 are disposed at an interval in the first direction 101. As shown in fig. 6, a plane perpendicular to the transverse direction of the adhesive packaging film 100 is taken as a first plane, and in the transverse direction, the thickened area 121 has a first projection in the first plane, and the thinned area has a second projection in the first plane. The first projection is trapezoidal and the second projection is trapezoidal.

Specifically, the width W2 of the glue film body 11 is 111.70cm, and the thickness H2 is 0.54cm; the width W1 of the overflow preventing part 12 is 1.00cm; the thickness H1 of the thickened area 121 is 0.80cm, the length L1 is 8.00cm, and the ratio of the area of the first projection to the area of the second projection is 7.2:1; the thinned region 122 has a thickness H3 of 0.44cm and a length L2 of 4.00cm.

Example 8

As shown in fig. 1, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow part 12. Wherein the glue film body 11 extends along the first direction 101, and the anti-overflow part 12 is disposed on two sides of the glue film body 11 along the first direction 101. The spill prevention portion 12 includes a thickened region 121 and a thinned region 122, and the thickened region 121 and the thinned region 122 are spaced apart from each other along the first direction 101. As shown in fig. 6, a plane perpendicular to the transverse direction of the packaging adhesive film 100 is taken as a first plane, and in the transverse direction, the thickened area 121 has a first projection in the first plane, and the thinned area has a second projection in the first plane. The first projection is trapezoidal and the second projection is trapezoidal.

Specifically, the width W2 of the glue film body 11 is 104.00, and the thickness H2 is 0.60cm; the width W1 of the overflow preventing part 12 is 0.20cm; the thickness H1 of the thickened region 121 is 1.20cm, the length L1 is 6.00cm, and the ratio of the area of the first projection to the area of the second projection is 4.5; the thinned region 122 has a thickness H3 of 0.40cm and a length L2 of 4.00cm.

Example 9

As shown in fig. 1, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow part 12. The glue film body 11 extends along a first direction 101, and the overflow preventing portions 12 are disposed on two sides of the glue film body 11 along the first direction 101. The spill prevention portion 12 includes a thickened region 121 and a thinned region 122, and the thickened region 121 and the thinned region 122 are disposed at an interval in the first direction 101. As shown in fig. 6, a plane perpendicular to the transverse direction of the adhesive packaging film 100 is taken as a first plane, and in the transverse direction, the thickened area 121 has a first projection in the first plane, and the thinned area has a second projection in the first plane. The first projection is trapezoidal and the second projection is trapezoidal.

Specifically, the width W2 of the glue film body 11 is 100.00cm, and the thickness H2 is 0.52cm; the width W1 of the overflow preventing part 12 is 0.90cm; the thickness H1 of the thickened area 121 is 0.72cm, the length L1 is 5.00cm, and the ratio of the area of the first projection to the area of the second projection is 50:9; the thinned region 122 has a thickness H3 of 0.40cm and a length L2 of 2.00cm.

Example 10

As shown in fig. 1, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow part 12. The glue film body 11 extends along a first direction 101, and the overflow preventing portions 12 are disposed on two sides of the glue film body 11 along the first direction 101. The spill prevention portion 12 includes a thickened region 121 and a thinned region 122, and the thickened region 121 and the thinned region 122 are disposed at an interval in the first direction 101. As shown in fig. 6, a plane perpendicular to the transverse direction of the packaging adhesive film 100 is taken as a first plane, and in the transverse direction, the thickened area 121 has a first projection in the first plane, and the thinned area has a second projection in the first plane. The first projection is trapezoidal and the second projection is trapezoidal.

Specifically, the width W2 of the glue film body 11 is 100.00cm, and the thickness H2 is 0.46cm; the width W1 of the overflow preventing part 12 is 0.80cm; the thickness H1 of the thickened area 121 is 0.90cm, the length L1 is 10.00cm, and the ratio of the area of the first projection to the area of the second projection is 11:1; the thinned region 122 has a thickness H3 of 0.36cm and a length L2 of 4.00cm.

Example 11

Specifically, the width W2 of the glue film body 11 is 100.00cm, and the thickness H2 is 0.40cm; the width W1 of the spill-proof part 12 is 1.10cm; the thickness H1 of the thickening region 121 is 0.50cm, the length L1 is 20.00cm, and the ratio of the area of the first projection to the area of the second projection is 6.5:1; the thinned region 122 has a thickness H3 of 0.10cm and a length L2 of 8.00cm.

Comparative example 1

As shown in FIG. 8, a packaging adhesive film 100 has a width of 100.00cm and a thickness of 0.60cm.

Comparative example 2

As shown in fig. 9, a packaging adhesive film 100 includes an adhesive film body 11 and an anti-overflow portion 12. Wherein the glue film body 11 extends along the first direction 101, and the anti-overflow part 12 is disposed on two sides of the glue film body 11 along the first direction 101. As shown in fig. 10, a plane perpendicular to the transverse direction of the packaging adhesive film 100 is taken as a first plane, and in the transverse direction, the spill prevention part 12 has a first projection in the first plane, and the first projection is rectangular.

Specifically, the width W2 of the glue film body 11 is 100.00cm, and the thickness H2 is 0.60cm; the width W1 of the overflow preventing portion 12 is 1.00cm, and the thickness is 1.00cm.

1. And (3) performance testing:

the packaging adhesive films in the above examples and comparative examples were subjected to performance tests. After the packaging adhesive films in the above embodiments and comparative examples are laminated as the front layer packaging adhesive film, the photovoltaic module 200 shown in fig. 7 is assembled for testing, the photovoltaic module 200 sequentially comprises a front layer substrate 21, a front layer packaging adhesive film 22, a battery string 23, a rear layer packaging adhesive film 24 and a rear layer substrate 25, the specific front layer substrate 21 adopts photovoltaic glass, the front layer packaging adhesive film 22 adopts the packaging adhesive films in the embodiments and comparative examples respectively, the battery string 23 adopts the battery string 23 adopting a P-PERC battery string, the rear layer packaging adhesive film 24 adopts F406PS (foster, houndsun), and the rear layer substrate 25 adopts a CPC back plate.

1. Edge retention: respectively measuring the thicknesses of the photovoltaic modules before and after lamination by using a thickness gauge, wherein the edge retention rate is = (the thickness of the module after pressure measurement/the thickness of the module before lamination) × 100%;

2. interlayer peel strength: and (3) testing the peel strength: refer to GB/T2790 "test method for 180 DEG peel strength of adhesive for flexible material vs. rigid material";

3. air bubbles: after lamination, the assembly was observed for bubbles and counted.

2. And (3) performance test results:

the results of the performance test of the packaging adhesive films of the above examples and comparative examples are shown in table 1 below.

Table 1: test results

	Edge retention (%)	Interlaminar peel strength (N/cm)	Bubble (piece)
				Example 1	95	198	0
Example 2	93	187	14
				Example 3	95	185	17
Example 4	98	186	20
				Example 5	96	189	0
Example 6	98	188	0
				Example 7	93	201	0
Example 8	80	155	13
				Example 9	75	164	9
Example 10	72	132	12
				Example 11	82	172	7
Comparative example 1	54	169	22
				Comparative example 2	68	171	5

As can be seen from the relevant data in Table 1, the edge retention rates of examples 1-11 are all higher than those of comparative examples 1 and 2, and the edge retention rates of examples 1-7 are greater than 90%, which is much higher than that of the packaging adhesive film in the prior art. Comparing examples 8 to 10 with examples 1 to 7, it can be seen that the overflow preventing portion having a certain width not only can improve the edge retention rate of the module, but also can enhance the interlayer peeling strength of the module, so that the module structure is more stable. Meanwhile, the number of bubbles in the embodiments 1-11 is smaller than that in the comparative example 1, and in the preferred scheme, almost no bubbles exist in the assembly, so that the yield of the assembly is greatly improved. For the embodiments 2-4, since the thickness of the thinning region is larger than that of the adhesive film body and the thickness difference between the thinning region and the thickening region is small, i.e. the air holes formed by the thinning region and the thickening region are too small, the air discharging effect is weak, and the number of the generated air bubbles is slightly larger than that of the other embodiments.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to fall within the scope of the appended claims.

Claims

1. A packaging adhesive film is characterized in that:

the adhesive film body extends along a first direction;

anti-overflow portion, anti-overflow portion follows first direction is located the both sides of glued membrane body, anti-overflow portion includes thickening district and attenuate district, the thickness in thickening district is greater than the thickness of glued membrane body, the thickness in attenuate district is less than the thickness in thickening district, thickening district with attenuate the district and follow first direction interval sets up.

2. The packaging adhesive film according to claim 1, wherein:

the width of the anti-overflow part is more than or equal to 5mm and less than or equal to 20mm.

3. The packaging adhesive film of claim 1, wherein:

in the first direction, a ratio of a length of the thickening region to a length of the thinning region is 2 or more and 5 or less.

4. The packaging adhesive film according to claim 1, wherein:

the ratio of the thickness of the thickening area to the thickness of the adhesive film body is more than or equal to 1.5 and less than or equal to 3.

5. The packaging adhesive film of claim 1, wherein:

the ratio of the thickness of the thinning area to the thickness of the adhesive film body is greater than or equal to 0.25 and less than or equal to 2.

6. The packaging adhesive film of claim 1, wherein:

the ratio of the thickness of the thinning area to the thickness of the thickening area is greater than or equal to 1/6 and less than or equal to 2/3.

7. The packaging adhesive film of claim 1, wherein:

defining a second direction, wherein the second direction is perpendicular to the first direction and parallel to the adhesive film body, a plane perpendicular to the second direction is taken as a first plane, and along the second direction, the thickening region has a first projection in the first plane, and the shape of the first projection comprises at least one of a rectangle, a triangle, a trapezoid or an arc.

8. The packaging adhesive film of claim 1, wherein:

defining a second direction, wherein the second direction is perpendicular to the first direction and parallel to the adhesive film body, a plane perpendicular to the second direction is taken as a first plane, and along the second direction, the thinning area has a second projection in the first plane, and the shape of the second projection comprises at least one of a rectangle, a triangle, a trapezoid or an arc.

9. The packaging adhesive film of claim 1, wherein:

defining a second direction, wherein the second direction is perpendicular to the first direction and parallel to the adhesive film body, a plane perpendicular to the second direction is taken as a first plane, the thickened area has a first projection in the first plane along the second direction, the thinned area has a second projection in the first plane, and the area ratio of the first projection to the second projection is greater than or equal to 1.

10. The utility model provides a photovoltaic module, includes front substrate, front rubber membrane, battery cluster, back floor glued membrane and back floor base plate, its characterized in that:

at least one of the front adhesive film or the back adhesive film is selected from the packaging adhesive film of any one of claims 1-9.