Packaging film of photovoltaic module and photovoltaic module

Abstract

The packaging film of the photovoltaic module comprises a main film part, a side film part and a connecting film part, the main film part is used for being bonded with a battery piece, the side film part is located on at least one side of the periphery of the main film part, the main film part and the side film part are made of different materials, and the connecting film part is used for connecting the main film part and the side film part. The connecting film part is connected between the main film part and the side film part, and the connecting film part is a combination of a material of the main film part and a material of the side film part. Therefore, according to the packaging film of the photovoltaic module, the main film part and the side film part which are made of different materials are arranged, so that the cross-linking speed of the main film part and the cross-linking speed of the side film part are basically kept consistent, the packaging film of the photovoltaic module can be prevented from generating bubbles due to non-uniform heating, the reliability of the photovoltaic module can be improved, and the service life of the photovoltaic module can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially a kind of encapsulation film and photovoltaic module of photovoltaic module. BACKGROUND

[0002] Currently, photovoltaic module mainly uses POE (Polyolefin Elastomer Film, i.e.polyolefin elastomer) film and EVA (ethylene-vinyl acetate copolymer, i.e.ethylene-vinyl acetate copolymer) film as encapsulation film. The reliability problems of photovoltaic products appear in POE film, and mainly in the short side of photovoltaic module. In the lamination process of photovoltaic module, the temperature of the short side of photovoltaic module is lower than that of the middle part, the cover plate of photovoltaic module is deformed by heat, and the crosslinking speed of the middle part of POE film is faster than that of the short side. This will cause POE film to produce bubbles due to uneven heating, affecting the reliability of photovoltaic module. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in prior art. Therefore, one purpose of the utility model is to provide an encapsulation film of photovoltaic module, which can ensure consistent crosslinking speed when heated, thereby preventing the phenomenon of bubbles in the encapsulation film of photovoltaic module due to uneven heating, and further improving the reliability of photovoltaic module.

[0004] The utility model further provides a photovoltaic module.

[0005] According to the encapsulation film of photovoltaic module of the first aspect of the utility model, the main film part is used for bonding with battery piece, the side film part is located at least one side of the outer periphery of the main film part, the material of the main film part and the material of the side film part are different, the connecting film part is connected between the main film part and the side film part, and the connecting film part is a combination of the material of the main film part and the material of the side film part.

[0006] Therefore, the encapsulation film of photovoltaic module can make the crosslinking speed of the main film part and the side film part basically consistent by setting the main film part and the side film part with different materials, thereby preventing the phenomenon of bubbles in the encapsulation film of photovoltaic module due to uneven heating, and further improving the reliability and prolonging the service life of photovoltaic module.

[0007] According to some embodiments of the utility model, the connecting film part is a mixed film part mixed with the material of the main film part and the material of the side film part.

[0008] According to some embodiments of the present application, the connecting film part is a mixed film part in which the material of the main film part and the material of the side film part are mixed in a hot melt, hot air, hot pressing or cold pressing manner.

[0009] According to some embodiments of the present application, the connecting film part is a composite film part in which the material of the main film part and the material of the side film part are compounded.

[0010] According to some embodiments of the present application, the connecting film part comprises a first connecting film layer and a second connecting film layer, the first connecting film layer is integrally formed with the main film part and has the same material, the second connecting film layer is integrally formed with the side film part and has the same material, and the first connecting film layer and the second connecting film layer are compounded in a laminated manner.

[0011] According to some embodiments of the present application, the width of the side film part is d1, the width of the connecting film part is d2, and d1 and d2 satisfy the relationship: 0.2d1≤d2≤0.8d1.

[0012] According to some embodiments of the present application, the width of the side film part is d1, and d1 satisfies the relationship: 8mm≤d1≤23mm; the width of the connecting film part is d2, and d2 satisfies the relationship: 2mm≤d2≤15mm.

[0013] According to some embodiments of the present application, the thickness of the main film part is h1, the thickness of the side film part is h2, and h1 and h2 satisfy the relationship: h1≤h2≤3h1.

[0014] According to some embodiments of the present application, the thickness of the main film part is h1, the thickness of the connecting film part is h3, and h1 and h3 satisfy the relationship: h1≤h3.

[0015] According to some embodiments of the present application, the side film part and the connecting film part are located on opposite sides of the main film part, a part of the side film part protrudes from the main film part and the connecting film part in the thickness direction of the main film part, and the main film part and the side film parts on the opposite sides jointly form a containing cavity for accommodating the battery piece.

[0016] According to some embodiments of the present application, the surface of the main film part is rectangular and has a long side and a short side, and the side film part and the connecting film part are located on opposite sides corresponding to the short side of the main film part.

[0017] According to some embodiments of the present application, the main film part is a POE film, and the side film part is an EVA film.

[0018] According to some embodiments of the present application, the main film part comprises: a first film layer and a second film layer, the second film layer is arranged between the first film layer, the first film layer and the side film part are EVA films, and the second film layer is a POE film.

[0019] According to the photovoltaic module of the second aspect of the present application, the packaging film of the photovoltaic module is as described above.

[0020] According to the photovoltaic module of the second aspect of the present application, the packaging film of the photovoltaic module is as described above.

[0021] Compared with the prior art, the present application adopts the mode of arranging the main film part and the side film part with different materials, so that the crosslinking speed of the main film part and the side film part can be basically consistent, thereby preventing bubbles from being generated in the packaging film of the photovoltaic module due to uneven heating, and further improving the reliability of the photovoltaic module and prolonging the service life thereof.

[0022] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings of which:

[0024] Figure 1 is a cross-sectional view of the packaging film of the photovoltaic module according to the first embodiment of the present application;

[0025] Figure 2 is a cross-sectional view of the packaging film of the photovoltaic module according to the second embodiment of the present application;

[0026] Figure 3 is a top view of the packaging film of the photovoltaic module according to the second embodiment of the present application;

[0027] Figure 4 is a cross-sectional view of the packaging film of the photovoltaic module according to the third embodiment of the present application;

[0028] Figure 5 is a cross-sectional view of the packaging film of the photovoltaic module according to the fourth embodiment of the present application;

[0029] Figure 6 is a top view of the encapsulation film of the photovoltaic module according to the fourth embodiment of the present utility model;

[0030] Figure 7 is a sectional view of the encapsulation film of the photovoltaic module according to the fifth embodiment of the present utility model;

[0031] Figure 8 is a sectional view of the encapsulation film of the photovoltaic module according to the sixth embodiment of the present utility model;

[0032] Figure 9 is a sectional view of the photovoltaic module according to the first embodiment of the present utility model;

[0033] Figure 10 is a sectional view of the photovoltaic module according to the second embodiment of the present utility model;

[0034] Figure 11 is a sectional view of the photovoltaic module according to the third embodiment of the present utility model;

[0035] Figure 12 is a sectional view of the photovoltaic module according to the fourth embodiment of the present utility model.

[0036] Reference signs:

[0037] 100, encapsulation film;

[0038] 10, main film part; 11, first film layer; 12, second film layer; 20, side film part; 30, connecting film part; 31, first connecting film layer; 32, second connecting film layer;

[0039] 200, front plate; 300, first adhesive film; 400, cell piece; 500, back plate. DETAILED DESCRIPTION

[0040] The embodiments of the present utility model are described in detail below, and the embodiments described with reference to the drawings are exemplary, and the embodiments of the present utility model are described in detail below.

[0041] The embodiments of the present utility model are described in detail below, and the embodiments described with reference to the drawings are exemplary, and the embodiments of the present utility model are described in detail below. Figures 1-12 The encapsulation film 100 of the photovoltaic module according to the embodiments of the present utility model is described below, which is applied in the photovoltaic module.

[0042] As Figures 1-12As shown, the packaging film 100 of the photovoltaic module according to the first aspect of the present application comprises: a main film part 10, a side film part 20 and a connecting film part 30, the main film part 10 is used for bonding with the cell piece 400, the side film part 20 is located at least one side of the outer periphery of the main film part 10, the material of the main film part 10 and the material of the side film part 20 are different, the connecting film part 30 is connected between the main film part 10 and the side film part 20, and the connecting film part 30 is a combination of the material of the main film part 10 and the material of the side film part 20.

[0043] It can be understood that the main film part 10, the side film part 20 and the connecting film part 30 constitute the main structure of the packaging film 100 of the photovoltaic module, the main film part 10 can be bonded with the cell piece 400, so that the packaging film 100 of the photovoltaic module and the cell piece 400 are connected into a whole.

[0044] Among them, the side film part 20 is located at one side of the outer periphery of the main film part 10, and the side film part 20 can be connected with other structures (for example, the first adhesive film 300 of the photovoltaic module) of the photovoltaic module at one side of the outer periphery of the main film part 10, so that the main film part 10 and the side film part 20 can be connected with other components respectively, thereby ensuring the stability of the photovoltaic module.

[0045] In addition, the material of the main film part 10 and the material of the side film part 20 are different. Thus, when the material of the main film part 10 is determined, by selecting the side film part 20 with a material different from that of the main film part 10, the crosslinking speed of the main film part 10 and the side film part 20 can be different, for example, the crosslinking speed of the side film part 20 at the same temperature can be faster than that of the main film part 10, so that when the photovoltaic module is laminated, the whole photovoltaic module is heated, the temperature of the central region is higher than that of the two short side regions, and the side edges of the cover plate of the photovoltaic module are heated and warped. Since the crosslinking speed of the side film part 20 at the same temperature is faster than that of the main film part 10, when the temperature of the two short side regions is slightly lower, the crosslinking speed of the side film part 20 can be close to or the same as that of the main film part 10, so that the crosslinking speed of the main film part 10 and the side film part 20 can be basically consistent, which can prevent the packaging film 100 of the photovoltaic module from generating bubbles when heated, thereby improving the reliability of the photovoltaic module and prolonging its service life.

[0046] For example, as shown in FIG. 1, the packaging film 100 of the photovoltaic module according to the first aspect of the present application comprises: a main film part 10, a side film part 20 and a connecting film part 30, the main film part 10 is used for bonding with the cell piece 400, the side film part 20 is located at least one side of the outer periphery of the main film part 10, the material of the main film part 10 and the material of the side film part 20 are different, the connecting film part 30 is connected between the main film part 10 and the side film part 20, and the connecting film part 30 is a combination of the material of the main film part 10 and the material of the side film part 20. Figure 1 and Figure 2As shown, the main film part 10 is a POE film, and the side film part 20 is an EVA film. The cross-linking speed of the EVA film is faster than that of the POE film at the same temperature. When the photovoltaic module is laminated, the photovoltaic module is heated as a whole, the side of the cover plate of the photovoltaic module is heated and warped, and the POE film is heated to a higher temperature than the EVA film. Thus, when the temperature on both sides of the short side is slightly lower, the cross-linking speed of the EVA film can be close to or the same as that of the POE film, so that the cross-linking speeds of the main film part 10 and the side film part 20 can be basically consistent. In addition, the main film part 10 is bonded to the battery piece 400, and the POE film is less corrosive than the EVA film, so that the battery piece 400 can be prevented from being corroded by the EVA film, thereby prolonging the service life of the battery piece 400.

[0047] The connecting film part 30 is located between the main film part 10 and the side film part 20, and the connecting film part 30 is a combination of the material of the main film part 10 and the material of the side film part 20. The connecting film part 30 is an intermediate transition region formed by the combination of the material of the main film part 10 and the material of the side film part 20. In this way, the connecting film part 30 can isolate the main film part 10 and the side film part 20, prevent the main film part 10 and the side film part 20 from mixing with each other, further make the cross-linking speed of the encapsulation film 100 basically consistent, and also ensure the connection reliability and stability of the encapsulation film 100.

[0048] Therefore, the encapsulation film 100 of the photovoltaic module can make the cross-linking speeds of the main film part 10 and the side film part 20 basically consistent by setting the main film part 10 and the side film part 20 with different materials, thereby preventing the encapsulation film 100 of the photovoltaic module from generating bubbles due to uneven heating, and further improving the reliability of the photovoltaic module and prolonging its service life.

[0049] Optionally, as shown in Figure 2 , Figure 3 , Figure 5 and Figure 6 , the connecting film part 30 is a mixed film part formed by mixing the material of the main film part 10 and the material of the side film part 20. It can be understood that the material of the main film part 10 and the material of the side film part 20 at the connecting film part 30 can form a fluid state under the action of the outside world, and then mix with each other to form the connecting film part 30. In this way, the degree of integration of the connecting film part 30 can be higher, and the whole encapsulation film 100 can be more stable.

[0050] Specifically, the connecting film part 30 is a mixed film part in which the material of the main film part 10 and the material of the side film part 20 are mixed by means of hot melting, hot air, hot pressing or cold pressing. It can be understood that the means of hot melting, hot air, hot pressing or cold pressing can make the material of the main film part 10 and the material of the side film part 20 enter each other and mix, thereby forming the mixed connecting film part 30. The above-mentioned method is simple and convenient, which can improve the manufacturing efficiency of the packaging film 100, and can ensure the mixing uniformity of the connecting film part 30, and further improve the reliability of the packaging film 100.

[0051] Alternatively, as shown in Figure 1 and Figure 4 , the connecting film part 30 is a composite film part in which the material of the main film part 10 and the material of the side film part 20 are compounded. It can be understood that the material of the main film part 10 and the material of the side film part 20 at the connecting film part 30 can be stacked with each other under the action of the outside world, and the stacked material of the main film part 10 and the material of the side film part 20 form the connecting film part 30. In this way, the material of the main film part 10 and the material of the side film part 20 can increase the contact area of the two by means of stacking, thereby improving the stability of the two at the connecting film part 30, and the forming method is simple and reliable.

[0052] Specifically, as shown in Figure 1 and Figure 4 , the connecting film part 30 comprises: a first connecting film layer 31 and a second connecting film layer 32, the first connecting film layer 31 is integrally formed with the main film part 10 and has the same material, the second connecting film layer 32 is integrally formed with the side film part 20 and has the same material, and the first connecting film layer 31 and the second connecting film layer 32 are compounded in a stacked manner.

[0053] It can be understood that the first connecting film layer 31 and the second connecting film layer 32 constitute the main structure of the connecting film part 30, the first connecting film layer 31 is integrally formed with the main film part 10, and the second connecting film layer 32 is integrally formed with the side film part 20. In this way, the first connecting film layer 31 is the edge part of the main film part 10, the second connecting film layer 32 is the edge part of the side film part 20, and the connecting film part 30 can be obtained by stacking the first connecting film layer 31 and the second connecting film layer 32. Of course, the first connecting film layer 31 and the second connecting film layer 32 can be laminated on the basis of stacking, so that they are more stable. In this way, the manufacturing efficiency of the packaging film 100 can be improved, the influence on the main film part 10 and the side film part 20 is small, and the width of the first connecting film layer 31 and the second connecting film layer 32 can be reasonably controlled, so that the connecting film part 30 with ideal width is obtained.

[0054] Alternatively, as shown in Figure 7 and Figure 8As shown, the width of the side film part 20 is d1, the width of the connecting film part 30 is d2, and d1 and d2 satisfy the relationship: 0.2d1≤d2≤0.8d1. That is, the relationship between the width of the side film part 20 and the width of the connecting film part 30 should be within a reasonable range. If the width of the connecting film part 30 is less than two-tenths of the width of the side film part 20, the width of the connecting part 30 of the side film part 20 and the main film part 10 is too small, which leads to insufficient connection between the side film part 20 and the main film part 10, and further leads to easy separation between the main film part 10 and the side film part 20, and poor isolation effect. If the width of the connecting film part 30 is greater than eight-tenths of the width of the side film part 20, the area of the connecting film part 30 is too large, which cannot make the main film part 10 and the side film part 20 have the characteristics of adhesion and corrosion resistance, and further is not conducive to the adhesion of the main film part 10 and the corresponding battery piece 400, and the adhesion of the side film part 20 and the corresponding first adhesive film 300. If the relationship between the width of the side film part 20 and the width of the connecting film part 30 is within a reasonable range, not only can the crosslinking speed of the main film part 10 and the side film part 20 be kept basically consistent, but also the connecting film part 30 does not affect the properties of the main film part 10 and the side film part 20, so that the adhesion of the main film part 10 and the corresponding battery piece 400, and the adhesion of the side film part 20 and the corresponding first adhesive film 300 can be guaranteed, and the battery piece 400 can be prevented from being corroded by the side film part 20, and further the reliability of the photovoltaic module can be improved and the service life thereof can be prolonged.

[0055] Optionally, as shown in Figure 7 and Figure 8 , the width of the side film part 20 is d1, and d1 satisfies the relationship: 8mm≤d1≤23mm; the width of the connecting film part 30 is d2, and d2 satisfies the relationship: 2mm≤d2≤15mm.

[0056] It can be understood that the width of the side film part 20 should be within a reasonable range. If the width of the side film part 20 is less than 8mm, the width of the side film part 20 is too small, which leads to insufficient connection between the main film part 10 and the side film part 20, and further leads to easy separation between the main film part 10 and the side film part 20. If the width of the side film part 20 is greater than 23mm, the material of the side film part 20 is wasted, which is not conducive to the purpose of saving cost. If the width of the side film part 20 is within a reasonable range, not only can the adhesion between the main film part 10 and the side film part 20 be guaranteed, but also the purpose of saving cost can be achieved.

[0057] The width of the connecting film part 30 should be within a reasonable range. If the width of the connecting film part 30 is less than 2 mm, the width of the connecting film part 30 is too small, which leads to insufficient connection of the main film part 10 and the side film part 20, and the main film part 10 and the side film part 20 are prone to separation, and the isolation effect is poor. If the width of the connecting film part 30 is greater than 15 mm, the material of the connecting film part 30 is wasted, and the size of the side film part 20 is too large, which is not conducive to the purpose of saving cost. If the width of the connecting film part 30 is within a reasonable range, the main film part 10 and the side film part 20 can be effectively isolated, the connecting film part 30 does not affect the properties of the main film part 10 and the side film part 20, thereby ensuring that the main film part 10 is bonded to the corresponding battery piece 400, and the side film part 20 is bonded to the corresponding first adhesive film 300, and the battery piece 400 is prevented from being corroded by the side film part 20, thereby improving the reliability of the photovoltaic module and prolonging its service life.

[0058] Optionally, as shown in Figure 7 and Figure 8 , the thickness of the main film part 10 is h1, and the thickness of the side film part 20 is h2, and h1 and h2 satisfy the relationship: h1≤h2≤3h1. It can be understood that the relationship between the thickness of the main film part 10 and the thickness of the side film part 20 should be within a reasonable range. If the thickness of the side film part 20 is less than the thickness of the main film part 10, the side film part 20 cannot be bonded to the first adhesive film 300 on the outer periphery of the main film part 10 after the main film part 10 is bonded to the battery piece 400, which leads to gaps between photovoltaic modules, and thus cannot guarantee the sealing of the photovoltaic module. If the thickness of the side film part 20 is greater than three times the thickness of the main film part 10, the thickness of the main film part 10 and the thickness of the side film part 20 differ too much, which increases the distance between the battery piece 400 and the first adhesive film 300 when the side film part 20 is bonded to the first adhesive film 300, and thus cannot meet the overall thickness requirement of the photovoltaic module. If the relationship between the thickness of the main film part 10 and the thickness of the side film part 20 is within a reasonable range, not only is it convenient for the main film part 10 to be bonded to the corresponding battery piece 400 and the side film part 20 to be bonded to the corresponding first adhesive film 300, but also the sealing of the photovoltaic module is guaranteed, and the side film part 20 is located on the outer periphery of the main film part 10, thereby preventing the encapsulation film 100 of the photovoltaic module from being heated unevenly to produce bubbles, and achieving the purpose of saving materials, thereby ensuring the reliability of the photovoltaic module.

[0059] Optionally, as shown in Figure 7 and Figure 8As shown, the thickness of the main film part 10 is h1, and the thickness of the connecting film part 30 is h3, and h1 and h3 satisfy the relationship: h1≤h3. That is, the relationship between the thickness of the main film part 10 and the thickness of the connecting film part 30 should be within a reasonable range. If the thickness of the main film part 10 is greater than the thickness of the connecting film part 30, this will cause the main film part 10 to be bonded to the battery piece 400, and the side film part 20 and the connecting film part 30 are not enough to bond the first adhesive film 300, thereby causing the battery piece 400 and the first adhesive film 300 cannot be bonded, and further affecting the sealing of the photovoltaic module; if the thickness of the main film part 10 is less than or equal to the thickness of the connecting film part 30, this can ensure that the main film part 10 is bonded to the corresponding battery piece 400, and the side film part 20 is bonded to the corresponding first adhesive film 300, thereby ensuring the sealing of the photovoltaic module, and further ensuring the performance of the photovoltaic module.

[0060] In addition, as shown in Figure 10 and Figure 12 , the side film part 20 and the connecting film part 30 are located on opposite sides of the main film part 10, and a part of the side film part 20 protrudes from the main film part 10 and the connecting film part 30 in the thickness direction of the main film part 10. The main film part 10 and the side film part 20 on the opposite sides form a receiving cavity for receiving the battery piece 400.

[0061] It can be understood that the side film part 20 is located on opposite sides of the outer periphery of the main film part 10, and one end of the side film part 20 in the thickness direction is higher than the main film part 10 and the connecting film part 30, so that a groove is formed between the main film part 10 and the side film part 20. This groove can form a receiving cavity, so that the receiving cavity can limit the battery piece 400, and further facilitate the bonding of the battery piece 400 and the main film part 10. Moreover, this can eliminate the step of splicing the adhesive film, and can improve the manufacturing efficiency of the packaging film 100.

[0062] In particular, as shown in Figures 9-12 , the surface of the main film part 10 is rectangular, and the surface of the main film part 10 has a long side and a short side, and the side film part 20 and the connecting film part 30 are located on opposite sides of the short side of the main film part 10. That is, the surface of the main film part 10 is rectangular, the rectangle has a long side and a short side, and the side film part 20 and the connecting film part 30 are located on the short side of the main film part 10. This can effectively prevent bubbles from occurring at the short side of the main film part 10, thereby improving the reliability of the photovoltaic module and prolonging its service life.

[0063] In addition, as shown in Figure 4 , Figure 5 , Figure 8 , Figure 11 and Figure 12As shown, the main film part 10 comprises: a first film layer 11 and a second film layer 12, the second film layer 12 is clamped between the first film layer 11, the material of the first film layer 11 and the material of the second film layer 12 are different, and the material of the first film layer 11 is the same as the material of the side film part 20. It can be understood that the first film layer 11 and the second film layer 12 are stacked in the thickness direction of the main film part 10, and the second film layer 12 is located between the first film layer 11. This arrangement can ensure the adhesion of the first film layer 11 and the second film layer 12, prevent the battery sheet 400 from being corroded, and the cost of different film layers is different, thereby achieving the purpose of saving cost.

[0064] For example, the first film layer 11 and the side film part 20 are both EVA films, and the second film layer 12 is a POE film. The crosslinking speed of the EVA film is faster than that of the POE film at the same temperature. The POE film is located between the EVA films. When the photovoltaic module is laminated, the whole photovoltaic module is heated, the temperature of the middle region is higher than that of the two short side regions, the side edges of the cover plate of the photovoltaic module are heated and warped, the crosslinking speed of the EVA film in the main film part 10 and the side film part 20 is the same, and the POE film between the EVA films can delay the crosslinking speed of the side film part 20, thereby preventing the encapsulation film 100 of the photovoltaic module from being heated unevenly to produce bubbles, and further improving the reliability of the photovoltaic module and prolonging its service life. Moreover, the adhesion of the EVA film is stronger than that of the POE film, and the price of the POE film is higher than that of the EVA film. Not only can the EVA film be more firmly adhered to the battery sheet 400, but also can save cost.

[0065] According to the photovoltaic module of the second aspect of the present application, the encapsulation film 100 of the photovoltaic module of the above embodiment is provided. By setting the main film part 10 and the side film part 20 with different materials, the crosslinking speed of the main film part 10 and the side film part 20 can be kept basically consistent, thereby preventing the encapsulation film 100 of the photovoltaic module from being heated unevenly to produce bubbles, and further improving the reliability of the photovoltaic module and prolonging its service life.

[0066] As Figures 9-12As shown, according to the photovoltaic module of the third aspect of the present application, it comprises: a front plate 200, a first adhesive film 300, a cell piece 400, a second adhesive film and a back plate 500, the first adhesive film 300 is arranged on one side of the front plate 200, the cell piece 400 is arranged on the side of the first adhesive film 300 away from the front plate 200, the second adhesive film is arranged on the other side of the cell piece 400, the second adhesive film is the encapsulating film 100 of the above photovoltaic module, the back plate 500 is arranged opposite to the front plate 200, and the second adhesive film is arranged on the side of the back plate 500 close to the front plate 200. The front plate 200 and the back plate 500 can protect the cell piece 400, thereby prolonging the service life of the cell piece 400, and the first adhesive film 300 and the second adhesive film are arranged on both sides of the thickness of the cell piece 400, thereby facilitating the cell piece 400 to be bonded on the front plate 200 and the back plate 500 through the first adhesive film 300 and the second adhesive film.

[0067] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0068] In the description of the present application, "first feature" and "second feature" can include one or more features. In the description of the present application, "a plurality of" means two or more. In the description of the present application, "above" or "below" of the first feature to the second feature can include direct contact of the first and second features, or can include indirect contact of the first and second features through another feature therebetween. In the description of the present application, "above", "above" and "above" of the first feature to the second feature include the first feature directly above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height.

[0069] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0070] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An encapsulation film (100) for a photovoltaic module, characterized in that, include: The main film portion (10) is used to bond with the battery cell (400); Side membrane portion (20), the side membrane portion (20) is located on at least one side of the outer periphery of the main membrane portion (10), the material of the main membrane portion (10) and the material of the side membrane portion (20) are different; A connecting membrane portion (30) is connected between the main membrane portion (10) and the side membrane portion (20), and the connecting membrane portion (30) is a combination of the material of the main membrane portion (10) and the material of the side membrane portion (20).

2. The encapsulation film (100) for a photovoltaic module according to claim 1, characterized in that, The connecting membrane (30) is a mixed membrane composed of the material of the main membrane (10) and the material of the side membrane (20).

3. The encapsulation film (100) for a photovoltaic module according to claim 2, characterized in that, The connecting membrane (30) is a mixed membrane in which the material of the main membrane (10) and the material of the side membrane (20) are mixed by means of hot melting, hot air, hot pressing or cold pressing.

4. The encapsulation film (100) of the photovoltaic module according to claim 1, characterized in that, The connecting membrane (30) is a composite membrane composed of the material of the main membrane (10) and the material of the side membrane (20).

5. The encapsulation film (100) for a photovoltaic module according to claim 4, characterized in that, The connecting membrane portion (30) includes: The first connecting membrane layer (31) is integrally formed with the main membrane part (10) and is made of the same material; The second connecting film layer (32) is integrally formed with the side film portion (20) and is made of the same material. The first connecting film layer (31) and the second connecting film layer (32) are composite in a stacked manner.

6. The encapsulation film (100) for a photovoltaic module according to claim 1, characterized in that, The width of the side membrane portion (20) is d1, and the width of the connecting membrane portion (30) is d2. d1 and d2 satisfy the relationship: 0.2d1≤d2≤0.8d1.

7. The encapsulation film (100) of the photovoltaic module according to claim 1, characterized in that, The width of the side membrane portion (20) is d1, and d1 satisfies the relationship: 8mm≤d1≤23mm; The width of the connecting membrane (30) is d2, and d2 satisfies the relationship: 2mm≤d2≤15mm.

8. The encapsulation film (100) for a photovoltaic module according to claim 1, characterized in that, The thickness of the main membrane portion (10) is h1, and the thickness of the side membrane portion (20) is h2. h1 and h2 satisfy the relationship: h1≤h2≤3h1.

9. The encapsulation film (100) for a photovoltaic module according to claim 1, characterized in that, The thickness of the main membrane portion (10) is h1, and the thickness of the connecting membrane portion (30) is h3. h1 and h3 satisfy the relationship: h1≤h3.

10. The encapsulation film (100) of the photovoltaic module according to claim 1, characterized in that, The side membrane portion (20) and the connecting membrane portion (30) are located on opposite sides of the main membrane portion (10). A portion of the side membrane portion (20) protrudes from the main membrane portion (10) and the connecting membrane portion (30) in the thickness direction of the main membrane portion (10). The main membrane portion (10) and the side membrane portions (20) on opposite sides together form a receiving cavity for accommodating the battery cell (400).

11. The encapsulation film (100) of the photovoltaic module according to claim 10, characterized in that, The surface of the main membrane portion (10) is rectangular and has a long side and a short side. The side membrane portion (20) and the connecting membrane portion (30) are located on opposite sides corresponding to the short side of the main membrane portion (10).

12. The encapsulation film (100) of the photovoltaic module according to claim 1, characterized in that, The main membrane section (10) is a POE membrane, and the side membrane section (20) is an EVA membrane.

13. The encapsulation film (100) for a photovoltaic module according to claim 1, characterized in that, The main membrane portion (10) includes: a first membrane layer (11) and a second membrane layer (12), the second membrane layer (12) being sandwiched between the first membrane layer (11), the first membrane layer (11) and the side membrane portion (20) being both EVA membranes, and the second membrane layer (12) being a POE membrane.

14. A photovoltaic module, characterized in that, include: The encapsulation film (100) of the photovoltaic module according to any one of claims 1-13.

15. A photovoltaic module, characterized in that, include: front plate(200); A first adhesive film (300) is disposed on one side of the front panel (200); A battery cell (400) is disposed on the side of the first adhesive film (300) away from the front panel (200); The second adhesive film is disposed on the other side of the solar cell (400), and the second adhesive film is the encapsulation film (100) of the photovoltaic module according to any one of claims 1-13. A back panel (500) is disposed opposite to the front panel (200), and the second adhesive film is disposed on the side of the back panel (500) near the front panel (200).

Images