Adhesive film for photovoltaic module

Abstract

The invention relates to the field of photovoltaic technology, in particular to an adhesive film for a photovoltaic module, which comprises an adhesive film body, the adhesive film body is provided with a first surface and a second surface which are distributed oppositely, and the first surface is provided with a first texture part, a second texture part, a third texture part, a fourth texture part, a fifth texture part and a sixth texture part which are spliced in sequence; a first protruding part is arranged at the joint of the first texture part and the second texture part, a second protruding part is arranged at the joint of the fifth texture part and the sixth texture part, and a third protruding part and a fourth protruding part are arranged at the joint of the third texture part and the fourth texture part. The third protruding parts and the fourth protruding parts are distributed at intervals in the length extending direction of the adhesive film body, and the first protruding parts and the second protruding parts are distributed at intervals in the width extending direction of the adhesive film body. According to the adhesive film for the photovoltaic module, bubbles can be reduced during lamination, and the problem of delamination is solved.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to an adhesive film for photovoltaic modules. Background Art

[0002] Photovoltaic modules are a common semiconductor device that converts solar energy into electrical energy. The packaging of photovoltaic modules is an important process step in the production of photovoltaic modules.

[0003] Adhesive film is required for the packaging of DBB components (also known as Dense-Busbar components); however, during lamination, the adhesive film provided by the related technology is prone to problems of bubbles and delamination. Summary of the invention

[0004] The purpose of the present invention includes providing an adhesive film for photovoltaic modules, which can reduce the occurrence of bubbles and improve the delamination problem during lamination.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] The present invention provides an adhesive film for a photovoltaic module, comprising: an adhesive film body, the adhesive film body having a first surface and a second surface that are arranged opposite to each other, the first surface having a first texture portion, a second texture portion, a fifth texture portion and a sixth texture portion; wherein:

[0007] A first convex portion is provided at the junction of the first texture portion and the second texture portion, a second convex portion is provided at the junction of the fifth texture portion and the sixth texture portion, and the first convex portion and the second convex portion are spaced apart along the width extension direction of the adhesive film body.

[0008] In an optional embodiment, the photovoltaic module includes a plurality of first ridges and a plurality of second ridges connected to the first surface, and the plurality of first ridges are sequentially arranged on the first texture portion, and the plurality of second ridges are sequentially arranged on the second texture portion, the first ridges are arc-shaped, and the convex surface of the first ridges faces the second texture portion; the height of the first ridge close to the second texture portion is greater than the height of the first ridge away from the second texture portion to form a first convex portion; and / or,

[0009] The second convex strip is arc-shaped, and the convex surface of the second convex strip faces the first texture portion; the height of the second convex strip close to the first texture portion is greater than the height of the second convex strip far from the first texture portion, so as to form a first convex portion.

[0010] In an optional embodiment, along the direction from the first texture portion to the second texture portion, the heights of the plurality of first convex strips gradually increase;

[0011] Along the direction from the second texture portion to the first texture portion, the heights of the plurality of second convex strips gradually increase.

[0012] In an optional embodiment, the centers of the plurality of first convex strips are distributed on the same set axis, and the center angle of the first convex strip close to the second texture portion is smaller than the center angle of the first convex strip far from the second texture portion; and / or,

[0013] Along the direction from the first texture portion to the second texture portion, the central angles of the plurality of first convex strips gradually decrease.

[0014] In an optional embodiment, the centers of the plurality of second ridges are arranged on the same set axis, and the center angle of the second ridge close to the first texture portion is smaller than the center angle of the second ridge far from the first texture portion; and / or,

[0015] Along the direction from the second texture portion to the first texture portion, the central angles of the plurality of second convex strips gradually decrease.

[0016] In an optional embodiment, the height of at least one of the first convex strip and the second convex strip gradually increases and then gradually decreases along the length extension direction thereof.

[0017] In an optional embodiment, the first surface also has a third texture portion and a fourth texture portion, and the first texture portion, the second texture portion, the third texture portion, the fourth texture portion, the fifth texture portion and the sixth texture portion are arranged in sequence, and the junction of the third texture portion and the fourth texture portion has a third protrusion portion and a fourth protrusion portion, and the third protrusion portion and the fourth protrusion portion are spaced apart along the length extension direction of the film body.

[0018] In an optional embodiment, the adhesive film for photovoltaic modules further includes a plurality of third ridges and a plurality of fourth ridges connected to the first surface, the plurality of third ridges are sequentially arranged on the third texture portion, and the plurality of fourth ridges are sequentially arranged on the fourth texture portion;

[0019] The third convex strip is arc-shaped, and the convex surface of the third convex strip faces the second texture portion; and / or,

[0020] The fourth convex strip is arc-shaped, and the convex surface of the fourth convex strip is away from the third texture portion.

[0021] In an optional embodiment, the heights of both ends of the third convex strip in the length extension direction are greater than the height of the middle portion thereof, so as to form a third convex portion and a fourth convex portion respectively; and / or,

[0022] The heights of both ends of the fourth convex strip in the length extension direction are greater than the height of the middle portion thereof, so as to form a third convex portion and a fourth convex portion respectively.

[0023] In an optional embodiment, the height of the third ridge close to the fourth texture portion is greater than the height of the third ridge far from the fourth texture portion; and / or,

[0024] In a direction from the third texture portion to the fourth texture portion, heights of the plurality of third convex strips gradually increase.

[0025] In an optional embodiment, the height of the fourth ridge close to the third texture portion is greater than the height of the fourth ridge far from the third texture portion; and / or,

[0026] In a direction from the fourth texture portion to the third texture portion, heights of the plurality of fourth convex strips gradually increase.

[0027] In an optional embodiment, the centers of the plurality of third ridges are distributed on the same set axis, and the center angle of the third ridge close to the second texture portion is greater than the center angle of the third ridge far from the second texture portion; and / or,

[0028] The centers of the plurality of fourth convex strips are distributed on the same set axis, and the center angle of the fourth convex strip close to the third texture portion is smaller than the center angle of the fourth convex strip far from the third texture portion.

[0029] In an optional embodiment, the adhesive film for photovoltaic modules further includes a plurality of fifth ridges and a plurality of sixth ridges connected to the first surface, the plurality of fifth ridges are sequentially arranged on the fifth texture portion, and the plurality of sixth ridges are sequentially arranged on the sixth texture portion;

[0030] The fifth convex strip is arc-shaped, and the convex surface of the fifth convex strip faces the sixth texture portion; and / or,

[0031] The sixth convex strip is arc-shaped, and the convex surface of the sixth convex strip faces the fifth texture portion.

[0032] In an optional embodiment, the height of the fifth convex strip close to the sixth texture portion is greater than the height of the fifth convex strip away from the sixth texture portion, so as to form a second convex portion; and / or,

[0033] The height of the sixth convex strip close to the fifth texture portion is greater than the height of the sixth convex strip far from the fifth texture portion, so as to form a second convex portion.

[0034] In an optional embodiment, the height of at least one of the fifth ridge and the sixth ridge gradually increases and then gradually decreases along its length extension direction, so that the second protrusion is formed in the middle of the fifth ridge or the sixth ridge in the length extension direction.

[0035] In an optional embodiment, the centers of the plurality of fifth ridges are arranged on the same set axis, and the center angle of the fifth ridge close to the sixth texture portion is smaller than the center angle of the fifth ridge away from the sixth texture portion; and / or,

[0036] The centers of the plurality of sixth convex strips are arranged on the same set axis, and the center angle of the sixth convex strip close to the fifth texture portion is smaller than the center angle of the sixth convex strip far from the fifth texture portion.

[0037] The beneficial effects of the adhesive film for photovoltaic modules of the embodiment of the present invention include: the adhesive film for photovoltaic modules provided by the embodiment of the present invention includes an adhesive film body, the first surface of the adhesive film body has a first texture portion, a second texture portion, a fifth texture portion and a sixth texture portion, wherein the junction of the first texture portion and the second texture portion has a first convex portion, the junction of the fifth texture portion and the sixth texture portion has a second convex portion, and the first convex portion and the second convex portion are spaced apart along the width extension direction of the adhesive film body. In this way, two convex portions are formed on the first surface of the adhesive film body, and the two convex portions are roughly distributed at both ends of the width direction of the adhesive film body, and the thickness at the corresponding positions of the two convex portions is larger. During lamination packaging, the molten glue will flow from the thick position to the thin position, that is, the flowing glue can be used to drive out the gas to reduce the generation of bubbles, and the molten glue flowing to the thinner position can also play a role in filling the glue, so as to ensure that the originally thinner position can also have sufficient glue for bonding, thereby improving the bonding stability and improving the delamination problem.

[0038] The adhesive film provided in the embodiment of the present invention reduces the generation of bubbles during lamination and improves the delamination problem by adjusting the texture. No additional adhesive strips are required, which is also beneficial for reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 This is a schematic diagram of the structure of the adhesive film for photovoltaic modules in an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of the structure of the first texture part and the second texture part of the adhesive film for photovoltaic modules in an embodiment of the present invention;

[0042] Figure 3 It is a schematic structural diagram of the adhesive film body and the first convex strip in an embodiment of the present invention;

[0043] Figure 4 Schematic diagram of the structure of the third texture part and the fourth texture part of the adhesive film for photovoltaic modules in an embodiment of the present invention;

[0044] Figure 5 Schematic diagram of the structure of the adhesive film body and the third convex strip in an embodiment of the present invention.

[0045] Icon: 010-adhesive film for photovoltaic modules; 100-adhesive film body; 101-first raised portion; 102-second raised portion; 103-third raised portion; 104-fourth raised portion; 110-first texture portion; 111-first ridge; 120-second texture portion; 121-second ridge; 130-third texture portion; 131-third ridge; 140-fourth texture portion; 141-fourth ridge; 150-fifth texture portion; 151-fifth ridge; 160-sixth texture portion; 161-sixth ridge. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0051] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0052] The adhesive film provided by the related technology is prone to problems of bubbles and delamination during lamination. In order to improve the above problems, there is also a related technology that additionally lays small strips of adhesive film at the long and short sides of the adhesive film to increase the thickness of the long and short sides of the adhesive film, so that the molten adhesive can flow from the thick position to the thin position in the middle. However, this method of additionally laying small strips of adhesive film will not only lead to an increase in cost, but also easily lead to the problem of unmelting, and it is also easy to deviate the battery string when the adhesive film melts, flows and diffuses, that is, it is easy to cause the battery string to shift and cause parallel string phenomenon, and it is even easy to cause the glass to become light-transmitting due to the deviated battery string.

[0053] In order to improve the above problems, this embodiment provides a film for photovoltaic modules, which can effectively reduce the generation of bubbles and improve the delamination problem, reduce costs, improve the unmelted problem, reduce the risk of string spacing, increase the friction between the film and the glass, and prevent slipping.

[0054] Please refer to Figure 1 The adhesive film 010 for photovoltaic modules of this embodiment is used to connect battery strings and glass; wherein, the adhesive film 010 for photovoltaic modules includes an adhesive film body 100, the adhesive film body 100 has a first surface and a second surface arranged opposite to each other, the first surface is provided with a texture, specifically, the first surface has a first texture portion 110, a second texture portion 120, a fifth texture portion 150 and a sixth texture portion 160; wherein, the junction of the first texture portion 110 and the second texture portion 120 has a first protrusion 101, the junction of the fifth texture portion 150 and the sixth texture portion 160 has a second protrusion 102, and the first protrusion 101 and the second protrusion 102 are spaced apart along the width extension direction of the adhesive film body 100. In this way, two protrusions are formed on the first surface of the film body 100, and the two protrusions are roughly distributed at the two ends of the width direction of the film body 100. The thickness of the film at the corresponding positions of the two protrusions is relatively large. During lamination packaging, the molten glue will flow from the thick position to the thin position, and the flowing glue can be used to drive out the gas to reduce the generation of bubbles. In addition, the molten glue flows to the thinner position, which can also play a role in glue filling to ensure that the originally thinner position can also have sufficient glue for gluing, thereby improving the gluing stability and improving the delamination problem. The film provided in this embodiment reduces the generation of bubbles and improves the delamination problem during lamination by adjusting the texture. No additional glue strips are set, which is also conducive to reducing costs.

[0055] Furthermore, the first surface also has a third texture portion 130 and a fourth texture portion 140, the first texture portion 110, the second texture portion 120, the third texture portion 130, the fourth texture portion 140, the fifth texture portion 150 and the sixth texture portion 160 are arranged in sequence, and the junction of the third texture portion 130 and the fourth texture portion 140 has a third protrusion 103 and a fourth protrusion 104, and the third protrusion 103 and the fourth protrusion 104 are spaced apart along the length extension direction of the film body 100. In this way, the first surface of the film body 100 has four protrusions, and the four protrusions are roughly distributed on the four sides of the film body 100. During lamination packaging, the molten glue will flow from the thick position to the thin position, and the flowing glue can be used to drive out the gas to reduce the generation of bubbles. In addition, the molten glue flows to the position where the film thickness is thinner, and can also play the role of glue filling to ensure that the position with originally thin thickness can also have sufficient glue for gluing, thereby improving the gluing stability and improving the delamination problem.

[0056] It should be noted that, by setting the first protrusion 101, the second protrusion 102, the third protrusion 103 and the fourth protrusion 104, protrusions are formed at the positions corresponding to the four sides of the film body 100; during lamination, after the glue at the four protrusions melts, they will flow to the battery string, and the glue flowing to the battery string from all sides can act more evenly on the battery string, so as to improve the displacement and overlapping of the battery string.

[0057] Please refer to Figure 1 and Figure 2In this embodiment, the photovoltaic module includes a plurality of first ridges 111 and a plurality of second ridges 121 connected to the first surface, and the plurality of first ridges 111 are sequentially arranged on the first texture portion 110 along the width direction of the film body 100, and the plurality of second ridges 121 are sequentially arranged on the second texture portion 120 along the width direction of the film body 100, the first ridges 111 are arc-shaped, the convex surface of the first ridges 111 faces the second texture portion 120, and the two ends of the first ridges 111 in the length direction respectively extend to the two ends of the length direction of the film body 100, the second ridges 121 are arc-shaped, the convex surface of the second ridges 121 faces the first texture portion 110, and the two ends of the second ridges 121 in the length direction respectively extend to the two ends of the length direction of the film body 100; the height of the first ridges 111 close to the second texture portion 120 is greater than the height of the first ridges 111 far from the second texture portion 120 The height of the second ridge 121 close to the first texture portion 110 is greater than the height of the second ridge 121 away from the first texture portion 110. In this way, the first ridge 111 and the second ridge 121 with higher height can be used to form the first protrusion 101 together, and the multiple first ridges 111 of the first texture portion 110 form a distribution that diffuses toward the periphery of the film body 100 in the length direction of the film body 100, so as to ensure that the molten glue flows smoothly to the peripheral position where the film thickness is thinner during lamination, thereby effectively improving the problems of bubbles and delamination; correspondingly, the multiple second ridges 121 of the second texture portion 120 form a distribution that diffuses toward the middle of the film body 100 in the length direction of the film body 100, so as to ensure that the molten glue flows smoothly to the middle position where the film thickness is thinner during lamination, thereby effectively improving the problems of bubbles and delamination.

[0058] Of course, in other embodiments, the second convex strips 121 may also be linear, and the heights of the second convex strips 121 may also be the same.

[0059] In other embodiments, the heights of the first convex strips 111 may be the same, and the first protrusion 101 is formed only by the second convex strips 121 with a higher height close to the first texture portion 110 .

[0060] Optionally, the height of the plurality of first ridges 111 gradually increases along the direction from the first texture portion 110 to the second texture portion 120; the height of the plurality of second ridges 121 gradually increases along the direction from the second texture portion 120 to the first texture portion 110. In this way, a gradually decreasing texture structure can be formed on both sides of the first protruding portion 101, so as to ensure the fluidity of the melted adhesive film during lamination, thereby improving the problem of bubbles and delamination.

[0061] Optionally, see Figure 3, the height of the first convex strip 111 gradually increases and then gradually decreases along its length extension direction, and the height of the second convex strip 121 gradually increases and then gradually decreases along its length extension direction (not shown in the figure, refer to the figure of the second convex strip 121), that is, the height of the middle part of the first convex strip 111 is greater than the height of its two ends, and the height of the middle part of the second convex strip 121 is greater than the height of its two ends. Such a configuration can ensure that the first protrusion 101 is approximately located in the middle of the length extension direction of the adhesive film body 100, which is convenient for ensuring that the molten adhesive can smoothly flow in the length extension direction of the adhesive film body 100 during lamination, thereby ensuring that the end parts of the adhesive film body 100 in the length extension direction can be reliably glued, thereby improving the delamination problem.

[0062] Of course, in other embodiments, the height of any one of the first convex strip 111 and the second convex strip 121 is equal in the direction of the length extension thereof, and the first convex strip 111 with the highest height is the same as the second convex strip 121 with the highest height. In this way, it is advantageous for the glass to contact the first convex strip 111 with the highest height and the second convex strip 121 at the same time, that is, the glass can contact the first convex strip 111 and the second convex strip 121 at the position of the first protrusion 101 at the same time, so as to increase the contact area between the glass and the adhesive film, and also increase the roughness of the position where the adhesive film contacts the glass, thereby increasing the friction between the glass and the adhesive film, so as to improve the problem of glass slippage.

[0063] Alternatively, in other embodiments, the height of one of the first convex strip 111 and the second convex strip 121 is the same in the lengthwise extension direction thereof.

[0064] Optionally, see Figure 2 , the centers of the multiple first ridges 111 are distributed on the same set axis, and the center angle of the first ridge 111 close to the second texture portion 120 is smaller than the center angle of the first ridge 111 away from the second texture portion 120; such a configuration can make the multiple first ridges 111 form a diffuse distribution at the end of the length direction of the film body 100, and at the same time, the arrangement of the multiple first ridges 111 near the middle of the length direction of the film body 100 is tighter than the arrangement of the multiple first ridges 111 near the end of the length direction of the film body 100, so as to facilitate the melted adhesive to flow to the end of the film body 100 and the edge of the width direction of the film body 100 during lamination.

[0065] Furthermore, along the direction from the first texture portion 110 to the second texture portion 120, the central angles of the plurality of first ridges 111 gradually decrease. This arrangement is conducive to gradually decreasing the distribution density between the plurality of first ridges 111 from the middle of the first ridges 111 to the ends of the first ridges 111 in the direction of the length extension, so as to form a distribution that is dense in the middle and loose at both ends, thereby ensuring that the molten adhesive reliably flows to the periphery of the adhesive film body 100.

[0066] Optionally, see Figure 2 , the centers of the multiple second ridges 121 are arranged on the same set axis, and the center angle of the second ridge 121 close to the first texture portion 110 is smaller than the center angle of the second ridge 121 away from the first texture portion 110; such an arrangement can make the multiple second ridges 121 form a diffuse distribution at the end of the length direction of the film body 100, and at the same time, the arrangement of the multiple second ridges 121 in the middle of the length direction of the film body 100 is tighter than the arrangement of the multiple second ridges 121 in the end of the length direction of the film body 100, so as to facilitate the melted adhesive to flow to the end of the length extension direction of the film body 100 during lamination.

[0067] Furthermore, along the direction from the second texture portion 120 to the first texture portion 110, the central angles of the plurality of second ridges 121 gradually decrease. This arrangement is conducive to gradually decreasing the distribution density between the plurality of second ridges 121 from the middle of the second ridges 121 to the ends of the second ridges 121 in the length extension direction, so as to form a distribution that is dense in the middle and loose at both ends, thereby ensuring that the molten adhesive reliably flows to the ends and the middle of the adhesive film body 100 in the length direction.

[0068] Please refer to Figure 1 and Figure 4 In this embodiment, the adhesive film 010 for photovoltaic modules further includes a plurality of third ridges 131 and a plurality of fourth ridges 141 connected to the first surface, the plurality of third ridges 131 are sequentially arranged on the third texture portion 130, and the plurality of fourth ridges 141 are sequentially arranged on the fourth texture portion 140; the third ridges 131 are arc-shaped, and the convex surface of the third ridges 131 faces the second texture portion 120; the fourth ridges 141 are arc-shaped, and the convex surface of the fourth ridges 141 faces away from the third texture portion 130; the ends of the third ridges 131 and the fourth ridges 141 in the length direction extend to the ends of the length direction of the adhesive film body 100 respectively. In this way, the third ridges 131 and the fourth ridges 141 can be used to form a texture that spreads from the middle of the adhesive film body 100 to the periphery, which is conducive to ensuring that the melted adhesive flows smoothly to the periphery of the adhesive film body 100, thereby facilitating the bonding stability at the periphery of the adhesive film body 100 and improving the delamination problem.

[0069] Of course, in other embodiments, one of the third protrusion 131 and the fourth protrusion 141 is a straight line.

[0070] Optionally, the height of the third ridge 131 close to the fourth texture portion 140 is greater than the height of the third ridge 131 away from the fourth texture portion 140; with such an arrangement, during lamination, the melted glue of the thicker third ridge 103 can smoothly flow to both sides of the third ridge 103 along the width direction of the film body 100. Similarly, the melted glue of the thicker fourth ridge 104 can smoothly flow to both sides of the fourth ridge 104 along the width direction of the film body 100. On the one hand, the gas can be effectively discharged to reduce the generation of bubbles. On the other hand, glue can be supplemented at the edge of the film body 100 in the width direction of the film body 100 to improve the bonding stability and effectively improve the delamination problem.

[0071] Furthermore, the heights of the third ridges 131 gradually increase from the third texture portion 130 to the fourth texture portion 140. This arrangement allows the adhesive at a thicker location to flow smoothly and stably toward a location with a thinner adhesive film along the gradually decreasing third ridges 131 after melting.

[0072] Optionally, the height of the fourth ridge 141 close to the third texture portion 130 is greater than the height of the fourth ridge 141 away from the third texture portion 130; with such an arrangement, during lamination, the melted glue of the third protrusion 103 with a larger thickness can smoothly flow to both sides of the third protrusion 103 along the width direction of the film body 100. Similarly, the melted glue of the fourth protrusion 104 with a larger thickness can smoothly flow to both sides of the fourth protrusion 104 along the width direction of the film body 100. On the one hand, the gas can be effectively discharged to reduce the generation of bubbles. On the other hand, glue can be supplemented at the edge of the film body 100 in the width direction of the film body 100 to improve the bonding stability and effectively improve the delamination problem.

[0073] Furthermore, the heights of the plurality of fourth ridges 141 gradually increase from the fourth texture portion 140 to the third texture portion 130. This arrangement allows the adhesive at a thicker location to flow smoothly and stably toward a thinner location of the adhesive film body 100 along the fourth ridges 141 with gradually decreasing heights after melting.

[0074] Optionally, see Figure 1 and Figure 5, the height of the two ends of the third convex strip 131 in the direction of the length extension is greater than the height of the middle part, and the height of the two ends of the fourth convex strip 141 in the direction of the length extension is greater than the height of the middle part (not shown in the figure, refer to the diagram of the third convex strip 131), so as to form the third convex part 103 and the fourth convex part 104 respectively, that is, the third convex strip 131 and the fourth convex strip 141 both form a height distribution with high ends and low middle, so as to form two high points with greater thickness (i.e., the third convex part 103 and the fourth convex part 104) at both ends of the length extension direction of the adhesive film body 100. In this way, during lamination, the melted glue at the thicker position will flow along the third convex strip 131 and the fourth convex strip 141 whose heights gradually decrease to the thinner position in the middle of the adhesive film, thereby effectively discharging the gas, reducing the generation of bubbles, and increasing the glue content at the thinner part in the middle of the adhesive film, ensuring the bonding stability and improving the delamination problem.

[0075] Of course, in other embodiments, the heights of the third ridges 131 and the fourth ridges 141 in their length extension direction may also be equal, and the height of the third ridge 131 with the highest height is equal to the height of the fourth ridge 141 with the highest height; in this way, the glass can be in contact with the third ridge 131 and the fourth ridge 141 with the highest height at the same time to increase the contact area between the glass and the adhesive film, and can also increase the roughness of the position where the adhesive film contacts the glass, thereby increasing the friction between the glass and the adhesive film and improving the problem of glass slipping.

[0076] Optionally, see Figure 4 The centers of the plurality of third ridges 131 are distributed on the same set axis, and the center angle of the third ridge 131 close to the second texture portion 120 is greater than the center angle of the third ridge 131 away from the second texture portion 120; in this way, the third ridge 131 can be used to form a texture distribution that diffuses toward the outside of the adhesive film body 100 in the direction from the fourth texture portion 140 to the third texture portion 130, so that the melted glue at the third protrusion 103 and the fourth protrusion 104 can stably flow and disperse under the guidance of the texture formed by the plurality of third ridges 131, so as to improve the uniform distribution of the glue.

[0077] Furthermore, along the direction from the third texture portion 130 to the fourth texture portion 140, the central angles of the plurality of third ridges 131 gradually decrease, that is, along the direction from the fourth texture portion 140 to the third texture portion 130, the central angles of the plurality of third ridges 131 gradually increase. This arrangement can further ensure that the texture formed by the plurality of third ridges 131 can stably guide the flow of the molten glue.

[0078] Optionally, see Figure 4The centers of the plurality of fourth ridges 141 are distributed on the same set axis, and the center angle of the fourth ridge 141 close to the third texture portion 130 is smaller than the center angle of the fourth ridge 141 away from the third texture portion 130; in this way, the fourth ridge 141 can be used to form a texture distribution that diffuses toward the outside of the adhesive film body 100 in the direction from the third texture portion 130 to the fourth texture portion 140, so that the melted glue at the third protrusion 103 and the fourth protrusion 104 can stably flow and disperse under the guidance of the texture formed by the plurality of fourth ridges 141, so as to improve the uniform distribution of the glue.

[0079] Furthermore, along the direction from the third texture portion 130 to the fourth texture portion 140, the center angles of the plurality of fourth ridges 141 gradually increase, that is, along the direction from the fourth texture portion 140 to the third texture portion 130, the center angles of the plurality of third ridges 131 gradually decrease. This arrangement can further ensure that the texture formed by the plurality of fourth ridges 141 can stably guide the flow of the molten glue.

[0080] In this embodiment, please refer to Figure 1 The photovoltaic module adhesive film 010 further includes a plurality of fifth ridges 151 and a plurality of sixth ridges 161 connected to the first surface, wherein the plurality of fifth ridges 151 are sequentially arranged on the fifth texture portion 150, and the ends of the fifth ridges 151 in the length direction extend to the ends of the adhesive film body 100 in the length direction, and the plurality of sixth ridges 161 are sequentially arranged on the sixth texture portion 160, and the ends of the sixth ridges 161 in the length direction extend to the ends of the adhesive film body 100 in the length direction; the fifth ridge 151 is arc-shaped, and the convexity of the fifth ridge 151 The sixth ridge 161 is arc-shaped, and the convex surface of the sixth ridge 161 faces the fifth texture portion 150; the height of the fifth ridge 151 close to the sixth texture portion 160 is greater than the height of the fifth ridge 151 away from the sixth texture portion 160, and the height of the sixth ridge 161 close to the fifth texture portion 150 is greater than the height of the sixth ridge 161 away from the fifth texture portion 150. In this way, the fifth ridge 151 and the sixth ridge 161 with higher heights can be used together to form the second protrusion 102. The multiple sixth ridges 161 of the sixth texture portion 160 form a distribution that diffuses toward the periphery of the film body 100 in the length direction of the film body 100, so as to ensure that the molten adhesive flows smoothly to the periphery where the film thickness is thinner during lamination, thereby effectively improving the problems of bubbles and delamination; correspondingly, the multiple fifth ridges 151 of the fifth texture portion 150 form a distribution that diffuses toward the middle of the film body 100 in the length direction of the film body 100, so as to ensure that the molten adhesive flows smoothly to the middle where the film thickness is thinner during lamination, thereby effectively improving the problems of bubbles and delamination.

[0081] It should be understood that in other embodiments, one of the fifth ridge 151 and the sixth ridge 161 may also be a straight line.

[0082] In other embodiments, the heights of the fifth convex strips 151 may also be the same, and the second protrusion 102 is formed only by the sixth convex strip 161 with a higher height close to the fifth texture portion 150 .

[0083] Optionally, the heights of the plurality of fifth ridges 151 gradually increase in the direction from the fifth texture portion 150 to the sixth texture portion 160; and the heights of the plurality of sixth ridges 161 gradually increase in the direction from the sixth texture portion 160 to the fifth texture portion 150. In this way, a gradually decreasing texture structure can be formed on both sides of the second protruding portion 102, so as to ensure the fluidity of the melted adhesive film during lamination, thereby improving the problem of bubbles and delamination.

[0084] Optionally, the height of the fifth ridge 151 gradually increases and then gradually decreases along its length extension direction, and the height of the sixth ridge 161 gradually increases and then gradually decreases along its length extension direction, that is, the height of the middle part of the fifth ridge 151 is greater than the height of its two ends, and the height of the middle part of the sixth ridge 161 is greater than the height of its two ends, so that the second protrusion 102 is formed in the middle part of the length extension direction of the fifth ridge 151 or the sixth ridge 161, so as to ensure that the molten glue can smoothly flow in the length extension direction of the film body 100 during lamination, thereby ensuring that the end parts of the film body 100 in the length extension direction can be reliably glued, thereby improving the delamination problem.

[0085] Of course, in other embodiments, the height of any one of the fifth ridge 151 and the sixth ridge 161 is equal in the direction of the length extension thereof, and the fifth ridge 151 with the highest height is the same as the sixth ridge 161 with the highest height. In this way, it is advantageous for the glass to contact the sixth ridge 161 with the highest height and the fifth ridge 151 at the same time, that is, the glass can contact the sixth ridge 161 and the fifth ridge 151 at the position of the second protrusion 102 at the same time, so as to increase the contact area between the glass and the adhesive film, and also increase the roughness of the position where the adhesive film contacts the glass, thereby increasing the friction between the glass and the adhesive film, so as to improve the problem of glass slippage.

[0086] Alternatively, in other embodiments, the height of one of the fifth protruding strip 151 and the sixth protruding strip 161 is the same in the lengthwise extension direction thereof.

[0087] Optionally, the centers of the multiple fifth ridges 151 are arranged on the same set axis, and the center angle of the fifth ridge 151 close to the sixth texture portion 160 is smaller than the center angle of the fifth ridge 151 away from the sixth texture portion 160 (not shown in the figure, refer to the diagram of the second ridge 121); such a configuration can form a diffuse distribution of the multiple fifth ridges 151 at the end of the length direction of the film body 100, and at the same time, the arrangement of the multiple fifth ridges 151 near the middle of the length direction of the film body 100 is tighter than the arrangement of the multiple fifth ridges 151 near the end of the length direction of the film body 100, so as to facilitate the flow of the molten adhesive to the end of the length extension direction of the film body 100 during lamination.

[0088] Furthermore, in the direction from the fifth texture portion 150 to the sixth texture portion 160, the central angles of the plurality of fifth ridges 151 gradually decrease. This arrangement is conducive to gradually decreasing the distribution density between the plurality of fifth ridges 151 from the middle of the fifth ridge 151 to the end of the fifth ridge 151 in the length extension direction, so as to form a distribution with a dense center and loose ends, thereby ensuring that the melted adhesive reliably flows to the end and the middle of the adhesive film body 100 in the length direction.

[0089] Optionally, the centers of the multiple sixth ridges 161 are arranged on the same set axis, and the center angle of the sixth ridge 161 close to the fifth texture portion 150 is smaller than the center angle of the sixth ridge 161 away from the fifth texture portion 150 (not shown in the figure, refer to the figure of the first ridge 111); such a configuration can form a diffuse distribution of the multiple sixth ridges 161 at the end of the length direction of the film body 100, and at the same time, the arrangement of the multiple sixth ridges 161 near the middle of the length direction of the film body 100 is tighter than the arrangement of the multiple sixth ridges 161 near the end of the length direction of the film body 100, so as to facilitate the flow of the molten adhesive to the end of the film body 100 and the edge of the width direction of the film body 100 during lamination.

[0090] Furthermore, in the direction from the sixth texture portion 160 to the fifth texture portion 150, the central angles of the plurality of sixth ridges 161 gradually decrease. This arrangement is conducive to gradually decreasing the distribution density between the plurality of sixth ridges 161 from the middle of the sixth ridges 161 to the ends of the sixth ridges 161 in the length extension direction, so as to form a distribution that is dense in the middle and loose at both ends, thereby ensuring that the molten adhesive reliably flows to the periphery of the adhesive film body 100.

[0091] Optionally, the texture formed by the multiple first ridges 111 of the first texture portion 110 and the texture formed by the multiple sixth ridges 161 of the sixth texture portion 160 are symmetrically distributed about the central axis in the length direction of the film body 100; the texture formed by the multiple second ridges 121 of the second texture portion 120 and the texture formed by the multiple fifth ridges 151 of the fifth texture portion 150 are symmetrically distributed about the central axis in the length direction of the film body 100.

[0092] Optionally, the texture formed by the plurality of first convex strips 111 of the first texture portion 110 and the texture formed by the plurality of second convex strips 121 of the second texture portion 120 are symmetrically distributed about the axis between the first texture portion 110 and the second texture portion 120 .

[0093] Optionally, the texture formed by the plurality of sixth convex strips 161 of the sixth texture portion 160 and the texture formed by the plurality of fifth convex strips 151 of the fifth texture portion 150 are symmetrically distributed about the axis between the sixth texture portion 160 and the fifth texture portion 150 .

[0094] Optionally, the texture formed by the plurality of third convex strips 131 of the third texture portion 130 and the texture formed by the plurality of fourth convex strips 141 of the fourth texture portion 140 are symmetrically distributed about the axis between the third texture portion 130 and the fourth texture portion 140 .

[0095] Optionally, at least one of the first ridge 111 with the highest height, the second ridge 121 with the highest height, the third ridge 131 with the highest height, the fourth ridge 141 with the highest height, the fifth ridge 151 with the highest height, and the sixth ridge 161 with the highest height has a height of 0.015 to 0.85 mm, for example: 0.015 mm, 0.020 mm, 0.025 mm, 0.050 mm, 0.070 mm, 0.100 mm, 0.200 mm, 0.300 mm, 0.400 mm, 0.500 mm, 0.600 mm, 0.700 mm, 0.850 mm, etc., and no specific limitation is given here. With such arrangement, the maximum height of at least one of the first protrusion 101, the second protrusion 102, the third protrusion 103 and the fourth protrusion 104 can reach 0.015-0.85 mm, which can increase the local thickness of the adhesive film on the one hand; reduce the risk of causing hidden cracks in the glass or battery string on the other hand; and avoid the problem of unmelted parts of the adhesive film due to the first protrusion 101, the second protrusion 102, the third protrusion 103 and the fourth protrusion 104 being too thick during lamination.

[0096] In particular, compared with the related art of additionally setting small strips of film on the long and short sides of the film to improve the problems of bubbles and delamination during lamination, the additionally set small strips of film may cause the problem of unmelting due to the mismatch between the grammage and material of the small strips of film and the film itself, or the thickness of the small strips of film being too large. Through the new texture design of the film of this embodiment and the design of the four raised parts, there is no need to introduce additional strips of film, which can overcome the problem of mismatch between the grammage and material of the strips and the film. That is, it can reduce the problems of bubbles and delamination during lamination, and at the same time, control the heights of the first raised part 101, the second raised part 102, the third raised part 103 and the fourth raised part 104 through the texture design, effectively improving the problem of unmelting.

[0097] It should be noted that, in an embodiment where any one of the first ridge 111, the second ridge 121, the third ridge 131, the fourth ridge 141, the fifth ridge 151 and the sixth ridge 161 is a ridge of non-equal height, the height difference between the lowest point and the highest point is greater than 0 and less than or equal to 0.835 mm; taking the first ridge 111 with non-equal height as an example, the height of the highest point in the middle of the first ridge 111 can be 0.850 mm, the height of the lowest points at both ends of the first ridge 111 can be 0.015 mm, and the height difference between the highest point and the lowest point of the first ridge 111 is 0.835 mm.

[0098] Optionally, at least one of the height difference between two adjacent first ridges 111, the height difference between adjacent second ridges 121, the height difference between adjacent third ridges 131, the height difference between adjacent fourth ridges 141, the height difference between adjacent fifth ridges 151, and the height difference between adjacent sixth ridges 161 is 0.0005-0.0020 mm, for example: 0.0005 mm, 0.0010 mm, 0.0015 mm, 0.0020 mm, etc., which are not specifically limited here. Such a setting can make the texture on the film body 100 present a more gentle concave-convex distribution, which is conducive to improving the problem of hidden cracks in glass or battery strings.

[0099] Optionally, the central angle of at least one of the first ridge 111, the second ridge 121, the third ridge 131, the fourth ridge 141, the fourth ridge 141, the fifth ridge 151 and the sixth ridge 161 is 20-55°, for example: 20°, 30°, 35°, 40°, 55°, etc., which is not specifically limited here.

[0100] Optionally, at least one of the central angle difference between two adjacent first convex strips 111, the central angle difference between adjacent second convex strips 121, the central angle difference between adjacent third convex strips 131, the central angle difference between adjacent fourth convex strips 141, the central angle difference between adjacent fifth convex strips 151, and the central angle difference between adjacent sixth convex strips 161 is 0.5-5°, for example: 0.5°, 1°, 2°, 3°, 4°, 5°, etc., which are not specifically limited here. Such a configuration can make the texture on the adhesive film body 100 present a more gentle distribution, so as to ensure the uniformity of the adhesive during lamination, thereby effectively improving the delamination problem.

[0101] In summary, the adhesive film 010 for photovoltaic modules of the present invention can be used as at least one of the front film and the back film of the photovoltaic module, and the adhesive film for photovoltaic modules can reduce the occurrence of bubbles during lamination, and improve the problem of delamination, as well as the problems of unmelting, battery string offset, etc.

[0102] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A film for photovoltaic modules, characterized in that: include: The adhesive film body (100) comprises a first surface and a second surface which are arranged opposite to each other, the first surface comprises a first texture portion (110), a second texture portion (120), a fifth texture portion (150) and a sixth texture portion (160); wherein: A first protrusion (101) is provided at the junction of the first texture portion (110) and the second texture portion (120), and a second protrusion (102) is provided at the junction of the fifth texture portion (150) and the sixth texture portion (160), and the first protrusion (101) and the second protrusion (102) are spaced apart along the width extension direction of the adhesive film body (100).

2. The adhesive film for photovoltaic modules according to claim 1, characterized in that: The photovoltaic module comprises a plurality of first convex strips (111) and a plurality of second convex strips (121) connected to the first surface, and the plurality of first convex strips (111) are sequentially arranged on the first texture portion (110), and the plurality of second convex strips (121) are sequentially arranged on the second texture portion (120), the first convex strips (111) are arc-shaped, and the convex surface of the first convex strips (111) faces the second texture portion (120); the height of the first convex strips (111) close to the second texture portion (120) is greater than the height of the first convex strips (111) far from the second texture portion (120), so as to form the first convex portion (101); and / or, The second convex strip (121) is arc-shaped, and the convex surface of the second convex strip (121) faces the first texture portion (110); the height of the second convex strip (121) close to the first texture portion (110) is greater than the height of the second convex strip (121) away from the first texture portion (110), so as to form the first protrusion (101).

3. The adhesive film for photovoltaic modules according to claim 2, characterized in that: Along the direction from the first texture portion (110) to the second texture portion (120), the heights of the plurality of first ridges (111) gradually increase; along the direction from the second texture portion (120) to the first texture portion (110), the heights of the plurality of second ridges (121) gradually increase; and / or, The centers of the plurality of first convex strips (111) are distributed on the same set axis, and the center angle of the first convex strip (111) close to the second texture portion (120) is smaller than the center angle of the first convex strip (111) far from the second texture portion (120); and / or, The centers of the plurality of second convex strips (121) are arranged on the same set axis, and the center angle of the second convex strip (121) close to the first texture portion (110) is smaller than the center angle of the second convex strip (121) far from the first texture portion (110); and / or, The height of at least one of the first convex strip (111) and the second convex strip (121) gradually increases and then gradually decreases along the length extension direction thereof.

4. The adhesive film for photovoltaic modules according to claim 1, characterized in that: The first surface also has a third texture portion (130) and a fourth texture portion (140), and the first texture portion (110), the second texture portion (120), the third texture portion (130), the fourth texture portion (140), the fifth texture portion (150) and the sixth texture portion (160) are arranged in sequence, and the junction of the third texture portion (130) and the fourth texture portion (140) has a third protrusion portion (103) and a fourth protrusion portion (104), and the third protrusion portion (103) and the fourth protrusion portion (104) are spaced apart along the length extension direction of the film body (100).

5. The adhesive film for photovoltaic modules according to claim 4, characterized in that: The adhesive film for photovoltaic modules further comprises a plurality of third ridges (131) and a plurality of fourth ridges (141) connected to the first surface, the plurality of third ridges (131) being sequentially arranged on the third texture portion (130), and the plurality of fourth ridges (141) being sequentially arranged on the fourth texture portion (140); The third convex strip (131) is arc-shaped, and the convex surface of the third convex strip (131) faces the second texture portion (120); and / or, The fourth convex strip (141) is arc-shaped, and the convex surface of the fourth convex strip (141) faces away from the third texture portion (130).

6. The adhesive film for photovoltaic modules according to claim 5, characterized in that: The heights of both ends of the third convex strip (131) in the length extension direction are greater than the height of the middle part thereof, so as to respectively form the third convex portion (103) and the fourth convex portion (104); and / or, The heights of both ends of the fourth convex strip (141) in the length extension direction are greater than the height of the middle part thereof, so as to respectively form the third convex portion (103) and the fourth convex portion (104).

7. The adhesive film for photovoltaic modules according to claim 5 or 6, characterized in that: The height of the third convex strip (131) close to the fourth texture portion (140) is greater than the height of the third convex strip (131) away from the fourth texture portion (140); and / or, The height of the fourth convex strip (141) close to the third texture portion (130) is greater than the height of the fourth convex strip (141) far from the third texture portion (130).

8. The adhesive film for photovoltaic modules according to claim 5, characterized in that: The centers of the plurality of third ridges (131) are distributed on the same set axis, and the center angle of the third ridge (131) close to the second texture portion (120) is greater than the center angle of the third ridge (131) away from the second texture portion (120); and / or, The centers of the plurality of fourth ridges (141) are distributed on the same set axis, and the center angle of the fourth ridge (141) close to the third texture portion (130) is smaller than the center angle of the fourth ridge (141) away from the third texture portion (130).

9. The adhesive film for photovoltaic modules according to claim 1, characterized in that: The adhesive film for photovoltaic modules further comprises a plurality of fifth ridges (151) and a plurality of sixth ridges (161) connected to the first surface, the plurality of fifth ridges (151) being sequentially arranged on the fifth texture portion (150), and the plurality of sixth ridges (161) being sequentially arranged on the sixth texture portion (160); The fifth convex strip (151) is arc-shaped, and the convex surface of the fifth convex strip (151) faces the sixth texture portion (160); and / or, The sixth convex strip (161) is arc-shaped, and the convex surface of the sixth convex strip (161) faces the fifth texture portion (150).

10. The adhesive film for photovoltaic modules according to claim 9, characterized in that: The height of the fifth convex strip (151) close to the sixth texture portion (160) is greater than the height of the fifth convex strip (151) away from the sixth texture portion (160), so as to form the second protrusion (102); and / or, The height of the sixth convex strip (161) close to the fifth texture portion (150) is greater than the height of the sixth convex strip (161) away from the fifth texture portion (150), so as to form the second protrusion (102); and / or, The height of at least one of the fifth convex strip (151) and the sixth convex strip (161) gradually increases and then gradually decreases along the length extension direction thereof, so that the second protrusion (102) is formed in the middle of the length extension direction of the fifth convex strip (151) or the sixth convex strip (161); and / or, The centers of the plurality of fifth ridges (151) are arranged on the same set axis, and the center angle of the fifth ridge (151) close to the sixth texture portion (160) is smaller than the center angle of the fifth ridge (151) away from the sixth texture portion (160); and / or, The centers of the plurality of sixth ridges (161) are arranged on the same set axis, and the center angle of the sixth ridge (161) close to the fifth texture portion (150) is smaller than the center angle of the sixth ridge (161) away from the fifth texture portion (150).

Images