Composite adhesive film strip and photovoltaic module

Abstract

The utility model discloses a composite adhesive film strip and a photovoltaic module, which are applied to the field of photovoltaic technology. According to the utility model, the packaging adhesive film for packaging and filling is added on the basis of the functional film, so that the obtained composite adhesive film strip integrates the functional film and the packaging adhesive film. In the process of preparing a photovoltaic module, the composite adhesive film strip can be directly laid in a gap area and / or an edge area of a battery string layer, and a thinned front adhesive film and a thinned back adhesive film are combined, so that the scheme replaces the scheme of laying a whole thicker packaging adhesive film on the front surface and the back surface of the battery string layer in the traditional photovoltaic module, the use of the adhesive film is reduced, and the cost is reduced. Therefore, the cost of the adhesive film can be reduced, and the assembly production process of the gap film and the functional film is simplified; in addition, the thickness of the middle of the composite adhesive film strip is larger than that of the edge of the composite adhesive film strip, so that adhesive film steps generated by height difference when the composite adhesive film strip is in contact with other adhesive films can be reduced, and bubbles caused by the adhesive film steps are improved.

Description

TECHNICAL FIELD

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

[0002] In order to reduce the cost of film covering, the traditional no-busbar photovoltaic module usually increases gap film in the gap area of cell string layer to fill the gap area. With the increasing demand for power generation efficiency and appearance of no-busbar photovoltaic module, functional films such as reflective film and shading film are applied. The existing no-busbar photovoltaic module preparation process correspondingly increases the step of laying functional film in the gap area and the edge area. However, this preparation process requires multiple gap film lamination machines and functional film machines to cooperate with the sample preparation of the module, resulting in a very cumbersome preparation process. SUMMARY

[0003] Therefore, the purpose of the utility model is to provide a composite glue film strip and photovoltaic module, which can reduce the cost of glue film while simplifying the production process of modules with gap film and functional film.

[0004] To solve the above technical problems, the utility model provides a composite glue film strip, comprising: the functional film is provided with the packaging glue film on at least one side in the thickness direction; the width of the functional film is less than the width of the packaging glue film, and the functional film is located at the middle position of the packaging glue film in the width direction; the composite glue film strip includes a middle area and an edge area in the width direction, the middle area is provided with the functional film, the edge area is not provided with the functional film, and the thickness of the middle area is greater than the thickness of the edge area.

[0005] Optionally, the functional film is a reflective film or a shading film.

[0006] Optionally, at least one side surface of the reflective film is provided with a prismatic array structure.

[0007] And / or, the reflective angle of the reflective film is 20°-70°, and the values at both ends are included.

[0008] Optionally, the packaging glue film is EVA glue film, POE glue film, EPE glue film or EP glue film.

[0009] And / or, the width of the functional film is 2mm-10mm, and the values at both ends are included.

[0010] And / or, the thickness of the functional film is 5μm-100μm, and the values at both ends are included.

[0011] And / or, the width of the composite glue film strip is 5mm-150mm, and the values at both ends are included.

[0012] and / or, the middle thickness of the composite adhesive film strip is 0.11mm-0.3mm, and the values at both ends are included;

[0013] and / or, the gram weight of the encapsulation adhesive film is 50g-150g, and the values at both ends are included.

[0014] Optionally, the functional film is embedded in the interior of the encapsulation adhesive film; the functional film is provided with the encapsulation adhesive film on both sides in the thickness direction; the thickness of the edge area gradually decreases in the width direction away from the functional film;

[0015] Or, the functional film is embedded in the interior of the encapsulation adhesive film on one side in the thickness direction; the thickness of the edge area gradually decreases in the width direction away from the functional film.

[0016] Optionally, one side surface of the edge area in the thickness direction is a plane, and the other side surface is an inclined surface or an arc surface.

[0017] Optionally, the composite adhesive film strip comprises: two layers of encapsulation adhesive films; the two layers of encapsulation adhesive films are stacked in the thickness direction; the width of one layer of encapsulation adhesive film is smaller than that of the other layer of encapsulation adhesive film; and the functional film is arranged between the two layers of encapsulation adhesive films.

[0018] To solve the above technical problems, the utility model also provides a photovoltaic module, comprising: a plurality of composite adhesive film strips, and a back encapsulation layer, a back adhesive film, a cell string layer, a front adhesive film and a front encapsulation layer arranged in sequence in the thickness direction;

[0019] The cell string layer is provided with the composite adhesive film strip on at least one side in the thickness direction; the composite adhesive film strip is arranged on the side surface with smaller width in the thickness direction and corresponds to the gap area and / or the edge area of the cell string layer; and the composite adhesive film strip is the composite adhesive film strip as described above.

[0020] Optionally, the cell string layer comprises a plurality of cell strings; the cell string comprises a plurality of cell pieces and a carrier film; the carrier film is arranged on the surface of the cell piece; the cell piece is a main grid-free cell piece; and the carrier film and the cell piece are provided with a solder strip.

[0021] Optionally, the composite adhesive film strip comprises a first composite adhesive film strip; the functional film in the first composite adhesive film strip is a reflective film; the first composite adhesive film strip is arranged on the side of the cell string layer close to the back encapsulation layer; the first composite adhesive film strip covers the gap area; and the gap area comprises the gap between adjacent cell strings in the cell string layer and / or the gap between adjacent cell pieces in the cell string.

[0022] Optionally, the photovoltaic module further comprises an edge adhesive film; the edge adhesive film is arranged at the outer periphery of the cell string layer.

[0023] Optionally, the cell string layer further comprises a bus bar;

[0024] The composite adhesive film strip comprises a second composite adhesive film strip; the functional film in the second composite adhesive film strip is a shielding film; the second composite adhesive film strip is arranged at the side of the cell string layer close to the front encapsulation layer; and the second composite adhesive film strip covers the bus bar.

[0025] It can be seen that the composite adhesive film strip provided by the utility model integrates the functional film and the encapsulation adhesive film by adding the encapsulation adhesive film used for encapsulation and filling on the basis of the functional film. In the process of preparing the photovoltaic module, the composite adhesive film strip can be directly laid in the gap region and / or the edge region of the cell string layer, and combined with the thinned front adhesive film and the back adhesive film, so that the scheme replaces the scheme of laying the whole thick encapsulation adhesive film on the front and back of the cell string layer in the traditional photovoltaic module, reduces the use of the adhesive film, and thus the component production process of laying the gap film and the functional film can be simplified while reducing the cost of the adhesive film. In addition, since the middle thickness of the composite adhesive film strip is greater than the edge thickness of the composite adhesive film strip, the adhesive film step caused by the height difference when the composite adhesive film strip contacts with other adhesive films can be reduced, and the bubbles caused by the adhesive film step can be improved. The utility model also provides a photovoltaic module, which has the above beneficial effects. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the utility model, and those skilled in the art can obtain other drawings according to the provided drawings without creating creative labor.

[0027] Figure 1 The cross-sectional view of the first strip-shaped composite adhesive film strip provided by the utility model embodiment is shown in the figure.

[0028] Figure 2 The cross-sectional view of the second strip-shaped composite adhesive film strip provided by the utility model embodiment is shown in the figure.

[0029] Figure 3 The cross-sectional view of the third strip-shaped composite adhesive film strip provided by the utility model embodiment is shown in the figure.

[0030] Figure 4 The cross-sectional view of the fourth strip-shaped composite adhesive film strip provided by the utility model embodiment is shown in the figure.

[0031] Figure 5The fifth kind of sectional view of the strip-shaped composite adhesive film strip provided by the utility model embodiment;

[0032] Figure 6 The sixth kind of sectional view of the strip-shaped composite adhesive film strip provided by the utility model embodiment;

[0033] Figure 7 The seventh kind of sectional view of the strip-shaped composite adhesive film strip provided by the utility model embodiment;

[0034] Figures 8 to 10 The preparation flowchart of the strip-shaped composite adhesive film strip provided by the utility model embodiment;

[0035] Figure 11 The sectional view of the photovoltaic module with the first composite adhesive film strip provided by the utility model embodiment;

[0036] Figure 12 The sectional view of the photovoltaic module with the second composite adhesive film strip provided by the utility model embodiment;

[0037] Figure 13 The preparation flowchart of the photovoltaic module provided by the utility model embodiment.

[0038] The sign of the drawing is explained as follows:

[0039] 11-first composite adhesive film strip; 12-second composite adhesive film strip; 111-packaging adhesive film; 112-functional film; 1121-reflective film; 1122-shielding film; 3-back glass; 4-back adhesive film; 51-battery piece; 52-carrier film; 53-welding strip; 6-front adhesive film; 7-front glass. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the utility model embodiments clearer, the technical scheme in the utility model embodiments will be described clearly and completely in combination with the drawings in the utility model embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0041] Please refer to Figure 1The utility model discloses a kind of composite adhesive film strips, which can include: functional film 112 and encapsulation adhesive film 111;Functional film 112 is provided with encapsulation adhesive film 111 at least one side along the thickness direction;Functional film 112 is provided with encapsulation adhesive film 111 at least one side along the thickness direction;The width of functional film 112 is less than the width of encapsulation adhesive film 111, and functional film 112 is located at the middle position of encapsulation adhesive film 111 in the width direction;In the width direction, the composite adhesive film strip includes middle region and edge region, the middle region is provided with functional film 112, and the edge region is not provided with functional film 112, and the thickness of the middle region is greater than the thickness of the edge region.

[0042] It should be noted that the composite adhesive film strip in this embodiment is in a strip shape and is used to cover the gap region and / or edge region of the cell string layer in the photovoltaic module. In this embodiment, the width direction is perpendicular to the extension direction of the cell string. The width of the functional film 112 specifically refers to the width of the functional film 112 in the direction perpendicular to the extension direction of the cell string. The width of the encapsulation adhesive film 111 specifically refers to the width of the encapsulation adhesive film 111 in the direction perpendicular to the extension direction of the cell string.

[0043] This embodiment does not limit the specific type of encapsulation adhesive film 111. For example, the encapsulation adhesive film 111 can be an EVA adhesive film, a POE adhesive film, an EPE adhesive film, or an EP adhesive film. Among them, the EPE adhesive film and the EP adhesive film are adhesive films made by co-extrusion process from EVA adhesive film and POE adhesive film. It should be noted that EVA (Ethylene Vinyl Acetate Copolymer) and POE (Polyolefin elastomer) are common materials in the prior art. This embodiment does not limit the internal components of the encapsulation adhesive film 111, but directly uses the film layer made of existing materials as the encapsulation adhesive film 111.

[0044] This embodiment does not limit the specific type of functional film 112. For example, the functional film 112 can be a reflective film 1121 or a shielding film 1122. This embodiment does not limit the specific transparency of the functional film 112. For example, the functional film 112 can be transparent or opaque. It should be noted that the composite adhesive film strip including the reflective film 1121 can be used in the back structure of the photovoltaic module to reflect the light incident on the gap region to the surface of the cell sheet to continue power generation, so as to improve the power generation efficiency of the photovoltaic module. The composite adhesive film strip including the shielding film 1122 can be used in the front structure of the photovoltaic module to shield the bus bar or other positions, so as to increase the beauty of the photovoltaic module or other effects.

[0045] The embodiment is not limited to the specific type of the light-reflecting film 1121. The light-reflecting film 1121 can be, but is not limited to, an aluminum film. It should be noted that aluminum is a common material in the prior art. The embodiment is not limited to the internal components of the light-reflecting film 1121. Instead, the film layer made of the existing material is directly used as the light-reflecting film 1121. The embodiment is not limited to the specific structure of the light-reflecting film 1121. For example, at least one side surface of the light-reflecting film 1121 can be provided with a prismatic array structure. Specifically, the upper surface of the light-reflecting film 1121 can be provided with a prismatic array structure as shown in Figure 1 and Figure 2 The lower surface of the light-reflecting film 1121 can be provided with a prismatic array structure as shown in Figure 3 and Figure 4 The upper surface and the lower surface of the light-reflecting film 1121 can be provided with a prismatic array structure as shown in Figure 7 It should be noted that the light-reflecting film 1121 in the embodiment can reflect light at a non-perpendicular angle to the surface of the battery sheet through the prismatic array structure. The embodiment is not limited to the specific flatness of the surface of the light-reflecting film 1121. For example, the light-reflecting surface of the light-reflecting film 1121 can be flat or rough. The flat light-reflecting surface can be directly reflected. The rough light-reflecting surface can be diffusely reflected. The embodiment is not limited to the specific light-reflecting angle. For example, the light-reflecting angle of the light-reflecting film 1121 can be 20°-70°, and the values at both ends are included.

[0046] The embodiment is not limited to the specific color of the light-shielding film. The light-shielding film can be black or other colors. The embodiment is not limited to the specific flatness of the surface of the light-shielding film. For example, the surface of the light-shielding film can be flat or rough.

[0047] The embodiment is not limited to the specific arrangement of the adhesive film and the functional film 112. For example, the following arrangements can be included:

[0048] (1) As shown in Figures 1 to 6 , the functional film 112 is embedded in the inside of the encapsulating adhesive film 111. The functional film 112 is provided with the encapsulating adhesive film 111 on both sides in the thickness direction. The thickness of the edge region gradually decreases in the direction away from the functional film 112 in the width direction.

[0049] The embodiment is not limited to the specific shape of the cross section of the composite adhesive film strip in the thickness direction. For example, one side surface of the edge region in the thickness direction can be a plane, and the other side surface can be an inclined surface or an arc surface. It should be noted that when one side surface of the edge region in the thickness direction is a plane, and the other side surface is an inclined surface, the cross section of the edge region in the thickness direction is a standard trapezoidal shape as shown in Figure 1 , Figure 3 and Figure 5 When one side surface of the edge region in the thickness direction is a plane, and the other side surface is an arc surface, the cross section of the edge region in the thickness direction is a trapezoidal shape as shown inFigure 2 , Figure 4 and Figure 6 As shown, when one surface of the encapsulating film 111 in the edge region is flat and the other surface is curved along the thickness direction, the cross-section of the edge region in the thickness direction is a curved trapezoidal shape. This embodiment does not limit the specific inclination angle of the inclined surface or the specific curvature of the curved surface, as long as it ensures that the composite film strip can generate a step in the thickness direction, thereby reducing the film steps caused by the height difference when the composite film strip comes into contact with other films, and thus improving the bubbles caused by the film steps.

[0050] To make this embodiment easier to understand, as follows: Figures 8 to 10 As shown, this embodiment also provides a preparation process for a composite adhesive strip, the process including:

[0051] Step 1: Place the raw materials such as the encapsulating film 111 and the functional film 112;

[0052] Step 2: Confirm the number of layers and structure of the composite adhesive film strip. In this embodiment, the preparation of structure (1) requires a three-layer structure consisting of a layer of encapsulating adhesive film 111, a layer of functional film 112, and another layer of encapsulating adhesive film 111 arranged sequentially. The two layers of encapsulating adhesive film 111 have the same width. The basis weight of each layer of encapsulating adhesive film 111 can be 50g-150g, including the values ​​at both ends. The thickness of each layer of encapsulating adhesive film 111 can be 0.05mm-0.15mm, including the values ​​at both ends. The width of each layer of encapsulating adhesive film 111 can be 5mm-150mm, including the values ​​at both ends.

[0053] Step 3: Use cold pressing or infrared heat treatment to fuse the three-layer structure together to produce a strip of a certain shape with the functional membrane 112 sandwiched in the middle.

[0054] Step 4: The strip composite adhesive film strip is heat-treated or cold-treated to form a standard trapezoidal or curved trapezoidal cross-sectional structure.

[0055] (2) The functional film 112 is embedded in the encapsulating film 111 on one side along the thickness direction; the thickness of the edge region gradually decreases along the width direction away from the functional film 112. It should be noted that in this structure, the encapsulating film 111 is provided on only one side of the functional film 112 along the thickness direction. This embodiment does not limit the specific shape of the cross-section of the composite film strip in the thickness direction. For details, please refer to the structure (1) above, which will not be repeated here.

[0056] To make this embodiment easier to understand, this embodiment also provides a preparation process for a composite adhesive strip, the process including:

[0057] Step 1: Place the raw materials such as the encapsulating film 111 and the functional film 112;

[0058] Step 2: Confirm the number of layers and structure of the composite adhesive strip. In this embodiment, the preparation of structure (2) requires the use of two layers: a layer of encapsulating adhesive film 111 and a layer of functional film 112 arranged in sequence.

[0059] Step 3: Use cold pressing or infrared heat treatment to fuse the two layers together to produce a strip of a certain shape with the functional membrane 112 sandwiched in the middle.

[0060] Step 4: The strip composite adhesive film strip is heat-treated or cold-treated to form a standard trapezoidal or curved trapezoidal cross-sectional structure.

[0061] (3) such as Figure 7 As shown, the composite adhesive strip includes: two layers of encapsulating adhesive film 111; the two layers of encapsulating adhesive film 111 are stacked along the thickness direction: the width of one layer of encapsulating adhesive film 111 is smaller than the width of the other layer of encapsulating adhesive film 111; and a functional film 112 is disposed between the two layers of encapsulating adhesive film 111.

[0062] To make this embodiment easier to understand, this embodiment also provides a preparation process for a composite adhesive strip, the process including:

[0063] Step 1: Place the raw materials such as the encapsulating film 111 and the functional film 112;

[0064] Step 2: Confirm the number of layers and structure of the composite adhesive strip. In this embodiment, the preparation of structure (3) requires a three-layer structure consisting of a layer of encapsulating adhesive film 111, a layer of functional film 112, and a layer of encapsulating adhesive film 111 arranged sequentially; wherein, the widths of the two encapsulating adhesive films 111 are different.

[0065] Step 3: Using cold pressing or infrared heat treatment, the three-layer structure is combined together to produce a strip of a certain shape with a functional membrane 112 sandwiched in the middle. This strip of composite adhesive film has a trapezoidal structure without any other treatment.

[0066] This embodiment does not limit the specific width of the functional membrane 112. For example, the width of the functional membrane 112 can be 2mm-10mm, including the values ​​at both ends. This embodiment does not limit the specific thickness of the functional membrane 112. For example, the thickness of the functional membrane 112 can be 5μm-100μm, including the values ​​at both ends.

[0067] This embodiment does not limit the specific width of the composite adhesive strip. For example, the width of the composite adhesive strip can be 5mm-150mm, including the values ​​at both ends. This embodiment does not limit the specific thickness of the composite adhesive strip. For example, the thickness of the middle of the composite adhesive strip can be 0.11mm-0.3mm, including the values ​​at both ends.

[0068] Based on the above embodiment, the utility model discloses a functional film is added to the encapsulation adhesive film for encapsulating and filling on the basis of the functional film, and the composite adhesive film strip obtained integrates the functional film and the encapsulation adhesive film. In the process of preparing the photovoltaic module, the composite adhesive film strip can be directly laid in the gap area and / or the edge area of the cell string layer, and combined with the thinned front adhesive film and the back adhesive film, the scheme replaces the scheme of laying a whole thick encapsulation adhesive film on the front and back of the cell string layer in the traditional photovoltaic module, reduces the use of adhesive film, so that the adhesive film cost can be reduced, and the component production process of the gap film and the functional film is simplified. In addition, since the middle thickness of the composite adhesive film strip is greater than the edge thickness of the composite adhesive film strip, the adhesive film step caused by the height difference when the composite adhesive film strip contacts other adhesive films can also be reduced, and the bubbles caused by the adhesive film step can be improved.

[0069] Please refer to Figures 11 to 13 The utility model embodiment provides a kind of photovoltaic module, which can include: multiple composite adhesive film strips, and back encapsulation layer, back adhesive film 4, cell string layer, front adhesive film 6 and front encapsulation layer sequentially arranged along the thickness direction.

[0070] The cell string layer is provided with a composite adhesive film strip on at least one side along the thickness direction. The composite adhesive film strip has a surface with a small width along the thickness direction facing the cell string layer, and is arranged corresponding to the gap area and / or the edge area of the cell string layer. The composite adhesive film strip is as described above.

[0071] The present embodiment does not limit the specific type of front encapsulation layer. For example, the front encapsulation layer can be a transparent front plate or transparent glass. The present embodiment does not limit the specific type of back encapsulation layer. For example, the back encapsulation layer can be a transparent back plate or transparent glass.

[0072] The present embodiment does not limit the specific structure of the cell string layer, which can include but is not limited to the following structures: the cell string layer includes multiple cell strings; the cell string includes multiple cell pieces and a carrier film 52; the carrier film 52 is arranged on the surface of the cell piece; the cell piece is a main grid-free cell piece 51; a solder strip 53 is arranged between the carrier film 52 and the cell piece. It should be noted that the present embodiment is based on the main grid-free cell piece 51 film coating scheme, and the adhesive film cost is reduced by using the precise film coating scheme. By using the strip-shaped composite adhesive film strip in combination with the surface carrier film 52 of the main grid-free cell piece 51, and in combination with the thinned front adhesive film 6 and back adhesive film 4, the adhesive film is completely encapsulated, thereby reducing the use of adhesive film.

[0073] The present embodiment does not limit the specific position of the composite adhesive film strip, which can be determined according to the specific type of the composite adhesive film strip. For example, it can be arranged at the following two positions:

[0074] (1) as Figure 11As shown, the composite film strip may include a first composite film strip 11; the functional film 112 in the first composite film strip 11 is a reflective film 1121; the first composite film strip 11 may be disposed on one side of the battery string layer close to the back encapsulation layer; the first composite film strip 11 covers the gap region; the gap region includes the gap between adjacent battery strings in the battery string layer and / or the gap between adjacent battery cells in the battery string.

[0075] It should be noted that in this embodiment, the first composite film strip 11 may be used alone at the battery string spacing position and / or the battery cell spacing position to fill the gaps between the photovoltaic modules and between the strings; it may also be used in a "grid" cross pattern in the photovoltaic module in synchronization with the non-laminated strip-shaped film, for example, the photovoltaic module may further include: an edge film; the edge film is disposed on the outer periphery of the battery string layer. In this embodiment, the edge film is a traditional non-laminated strip-shaped film.

[0076] It should be noted that in this embodiment, the first composite film strip 11 may be disposed between the back encapsulation layer and the back film 4, or may be disposed between the back film 4 and the battery string layer.

[0077] (2) As Figure 12 shown, the battery string layer further includes a bus bar;

[0078] The composite film strip includes a second composite film strip 12; the functional film 112 in the second composite film strip 12 is a shielding film 1122; the second composite film strip 12 is disposed on one side of the battery string layer close to the front encapsulation layer; the second composite film strip 12 covers the bus bar.

[0079] It should be noted that in this embodiment, the second composite film strip 12 may be disposed between the front encapsulation layer and the front film 6, or may be disposed between the front film 6 and the battery string layer.

[0080] It should be noted that in this embodiment, the first composite film strip 11 may be disposed on one side of the battery string layer close to the back encapsulation layer; the second composite film strip 12 may be disposed on one side of the battery string layer close to the front encapsulation layer; it is also possible to simultaneously dispose the first composite film strip 11 on one side of the battery string layer close to the back encapsulation layer and the second composite film strip 12 on one side of the battery string layer close to the front encapsulation layer.

[0081] To make this embodiment easier to understand, as Figure 13 shown, this embodiment further provides a preparation process for a photovoltaic module, and the process includes:

[0082] Step 1: Prepare a strip-shaped composite film strip;

[0083] Step 2: Lay the front glass 7;

[0084] Step 3: the prepared strip-shaped composite adhesive film strip with the shielding film 1122 is fixed in the specified position range of the front glass 7 by using a machine or manually using hot pressing, cold pressing or glue, etc., to achieve the effect of supplementing the adhesive amount and shielding the bus bar;

[0085] Step 4: the front adhesive film 6 is laid;

[0086] Step 5: the battery string with the film is laid;

[0087] Step 6: the back adhesive film 4 is laid;

[0088] Step 7: the prepared strip-shaped composite adhesive film strip with the reflective film 1121 is fixed in the specified position range of the back adhesive film 4 by using a machine or manually using hot pressing, cold pressing or glue, etc., to achieve the effect of supplementing the adhesive amount and improving the power by reflecting;

[0089] Step 8: the back glass 3 is laid;

[0090] Step 9: the subsequent processes such as testing and laminating are performed.

[0091] Compared with the conventional preparation process, the preparation process in the embodiment adds a step of preparing the strip-shaped composite adhesive film strip, and after the preparation of the strip-shaped composite adhesive film strip, the strip-shaped composite adhesive film strip needs to be fixed in the front glass 7 or the back adhesive film 4, and the subsequent processes are consistent with the conventional preparation process, including welding, overlapping welding, adhesive film laying, testing, laminating, etc.

[0092] Based on the above embodiment, the utility model uses the above-mentioned composite adhesive film strip, which also has the above-mentioned beneficial effects.

[0093] The composite adhesive film strip and the photovoltaic module provided by the utility model are described in detail above, and for the general technical personnel in the field, according to the idea of the embodiment of the utility model, the specific implementation mode and the application range will be changed, and according to the above, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A composite adhesive strip, characterized in that, include: Functional films and encapsulating films; The functional membrane has the encapsulating film disposed on at least one side along its thickness direction; The width of the functional film is smaller than the width of the encapsulating film, and the functional film is located in the middle of the encapsulating film in the width direction; the composite film strip in the width direction includes a middle region and an edge region, the functional film is disposed in the middle region, the functional film is not disposed in the edge region, and the thickness of the middle region is greater than the thickness of the edge region.

2. The composite adhesive strip according to claim 1, characterized in that, The functional film is a reflective film or a shielding film.

3. The composite adhesive strip according to claim 2, characterized in that, At least one surface of the reflective film is provided with a prismatic array structure; And / or, the reflective angle of the reflective film is 20°-70°, including the values ​​at both ends.

4. The composite adhesive strip according to claim 1, characterized in that, The encapsulating film is an EVA film, POE film, EPE film, or EP film. And / or, the width of the functional membrane is 2mm-10mm, including the values ​​at both ends; And / or, the thickness of the functional membrane is 5μm-100μm, including the values ​​at both ends; And / or, the width of the composite adhesive strip is 5mm-150mm, including the values ​​at both ends; And / or, the thickness of the composite adhesive strip is 0.11mm-0.3mm in the middle, including the values ​​at both ends; And / or, the basis weight of the encapsulating film is 50g-150g, including the values ​​at both ends.

5. The composite adhesive strip according to any one of claims 1 to 4, characterized in that, The functional film is embedded inside the encapsulating film; the encapsulating film is provided on both sides of the functional film along the thickness direction; the thickness of the edge region gradually decreases along the width direction away from the functional film; Alternatively, the functional film is embedded inside the encapsulating film on one side along the thickness direction; the thickness of the edge region gradually decreases along the width direction away from the functional film.

6. The composite adhesive strip according to claim 5, characterized in that, The edge region has a flat surface on one side along the thickness direction and a sloped or curved surface on the other side.

7. The composite adhesive strip according to any one of claims 1 to 4, characterized in that, include: The two layers of the encapsulating film; The two layers of the encapsulating film are stacked along the thickness direction: the width of one layer of the encapsulating film is smaller than the width of the other layer of the encapsulating film; The functional film is disposed between the two layers of the encapsulating film.

8. A photovoltaic module, characterized in that, include: Multiple composite adhesive film strips, and a back encapsulation layer, a back adhesive film, a battery string layer, a front adhesive film, and a front encapsulation layer arranged sequentially along the thickness direction; The composite adhesive strip is provided on at least one side of the battery string layer along the thickness direction; the surface of the composite adhesive strip with the smaller width along the thickness direction faces the battery string layer and is provided corresponding to the gap region and / or edge region of the battery string layer; the composite adhesive strip is the composite adhesive strip as described in any one of claims 1 to 7.

9. The photovoltaic module according to claim 8, characterized in that, The battery string layer includes multiple battery strings; each battery string includes multiple battery cells and a carrier film; the carrier film is disposed on the surface of the battery cell; the battery cell is a gridless battery cell; and a solder strip is disposed between the carrier film and the battery cell.

10. The photovoltaic module according to claim 8 or 9, characterized in that, The composite adhesive strip includes a first composite adhesive strip; the functional film in the first composite adhesive strip is a reflective film; the first composite adhesive strip is disposed on the side of the battery string layer near the back encapsulation layer; the first composite adhesive strip covers the gap area; the gap area includes the gap between adjacent battery strings in the battery string layer, and / or the gap between adjacent battery cells in the battery string.

11. The photovoltaic module according to claim 10, characterized in that, Also includes: Edge adhesive film; the edge adhesive film is disposed on the outer periphery of the battery string layer.

12. The photovoltaic module according to claim 8 or 9, characterized in that, The battery string layer also includes busbars; The composite adhesive strip includes a second composite adhesive strip; the functional film in the second composite adhesive strip is a shielding film; the second composite adhesive strip is disposed on the side of the battery string layer near the front encapsulation layer; the second composite adhesive strip covers the busbar.

Images