Packaging adhesive film and photovoltaic module
By setting up a storage groove of inclined side walls on the packaging film, the problem of abnormal cell slip and spacing in photovoltaic modules is solved, and the welding fixation quality and product yield are improved.
Patent Information
- Application Number
- CN202420571989.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-21
AI Technical Summary
During the packaging process of photovoltaic modules, the surface of the packaging film is flat and the friction between the battery cell and the packaging film is small, resulting in the battery cell slipping, resulting in abnormal spacing of the battery cell, affecting subsequent welding and fixing.
A packaging adhesive film is designed, which is equipped with a receiving groove on one side surface of the adhesive film body. The receiving groove has an inclined side wall, which can be embedded in the battery cell, prevent slippage, and facilitate the arrangement of the interconnection strip, avoid bending and Breaked.
The stable fixation of the battery cells is achieved, the abnormal spacing problem is avoided, and the welding fixation quality and product yield are improved.
Smart Images
Figure CN222190755U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of photovoltaic technology, and in particular to a packaging film and a photovoltaic module. Background Art
[0002] Photovoltaic modules refer to power generation elements that convert solar energy into electrical energy. They mainly include glass, encapsulation film, battery cells and backplanes. Among them, the encapsulation film is mainly arranged between the battery cells and the backplane, which can seal, insulate and protect the battery cells.
[0003] In the process of bonding the battery cell to the packaging film, since the surface of the packaging film is relatively flat, the friction between the battery cell and the packaging film is small, which causes the battery cell to slip easily, resulting in abnormal spacing between the battery cells, affecting subsequent welding and fixation. Utility Model Content
[0004] Based on this, it is necessary to provide a packaging film and a photovoltaic module to address the problem that the friction between the battery cell and the packaging film is small, which causes the battery cell to slip easily and thus causes abnormal spacing between the battery cells.
[0005] According to one aspect of the present application, an embodiment of the present application provides a packaging film, including: a film body, a receiving groove is provided on one side surface of the film body, the receiving groove has a bottom wall, an opening opposite to the bottom wall, and a side wall connected between the bottom wall and the surface of the film body, the side wall is inclined relative to the bottom wall and the surface of the film body.
[0006] In one embodiment, the surface shape of the opening is polygonal or elliptical.
[0007] In one embodiment, the side wall is inclined at an angle of 105° to 165° relative to the bottom wall.
[0008] In one embodiment, the thickness of the adhesive film body is between 0.1 mm and 1.5 mm; along the thickness direction of the adhesive film body, the distance between the bottom wall and the surface of the adhesive film body is between 50 μm and 200 μm.
[0009] In one embodiment, a plurality of the accommodating grooves are disposed on the surface of the adhesive film body, the plurality of the accommodating grooves are arranged in rows along a first direction and in columns along a second direction, and the first direction intersects with the second direction.
[0010] In one of the embodiments, the maximum dimension of the accommodating groove in the first direction is between 150 mm and 250 mm.
[0011] In one embodiment, the minimum distance between two adjacent accommodating grooves in the same row in the first direction is between 0.4 mm and 4 mm.
[0012] In one embodiment, the maximum dimension of the accommodating groove in the second direction is between 75 mm and 150 mm.
[0013] In one of the embodiments, the minimum distance between two adjacent accommodating grooves in the same row in the second direction is between 0.5 mm and 2 mm.
[0014] According to another aspect of the present application, an embodiment of the present application further provides a photovoltaic module, comprising: the packaging film as described above; and a battery cell, wherein the battery cell is disposed in the receiving groove.
[0015] The above-mentioned packaging film, by setting a receiving groove on one side surface of the film body, and making the side wall of the receiving groove inclined relative to its bottom wall and the surface of the film body, allows the battery cell to be embedded in the receiving groove, achieving relatively stable fixation, not prone to slippage, thereby avoiding problems such as abnormal spacing between battery cells, and facilitating subsequent welding and fixation. In addition, the inclined side wall of the receiving groove is conducive to the setting of the interconnection strip on the battery cell, which can prevent the interconnection strip from bending and breaking during the lamination process, thereby improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the overall structure of a packaging film provided in one embodiment of the present application.
[0017] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle.
[0018] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at BB in the middle.
[0019] Figure 4 A schematic diagram of the structure of a photovoltaic module provided in one embodiment of the present application.
[0020] The reference numerals in the specific implementation manner are as follows:
[0021] 10: Encapsulation film;
[0022] 100: Adhesive film body;
[0023] 110: receiving groove, 111: bottom wall, 112: opening, 113: side wall;
[0024] 20: Battery cell;
[0025] 30: front packaging film;
[0026] 40: Back side encapsulation film
[0027] 50: front glass;
[0028] 60: back panel;
[0029] x: first direction, y: second direction. DETAILED DESCRIPTION
[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 application.
[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.
[0036] Figure 1 FIG. 1 shows a schematic diagram of the overall structure of a packaging film 10 provided in one embodiment of the present application. Figure 2 Shows Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle. Figure 3 Shows Figure 1 Schematic diagram of the cross-sectional structure at BB in the middle.
[0037] In order to at least partially solve the problem in the related art that the friction between the battery cell and the encapsulation film 10 is small, resulting in the battery cell being easy to slip, thereby causing abnormal spacing between the battery cells and affecting subsequent welding and fixing, please refer to Figures 1 to 3 The embodiment of the present application provides a packaging film 10, which includes a film body 100, and a receiving groove 110 is provided on one side surface of the film body 100. The receiving groove 110 has a bottom wall 111, an opening 112 opposite to the bottom wall 111, and a side wall 113 connected between the bottom wall 111 and the surface of the film body 100. The side wall 113 is inclined relative to the bottom wall 111 and the surface of the film body 100.
[0038] Among them, the material, shape, size, etc. of the film body 100 are not limited and are set according to actual use requirements. For example, in some embodiments, the film body 100 can use single-layer films such as EVA (Ethylene-Vinyl Acetate copolymer) film, POE (Polyolefin Elastomer) film, PVB (PolyvinylButyral) film, or two-layer co-extruded film of EVA and POE, three-layer co-extruded film of EVA, POE and EVA, etc. EVA film is a thermosetting and sticky film with excellent performance in adhesion, durability, optical properties, etc.
[0039] The adhesive film body 100 has two opposite surfaces, and a receiving groove 110 is provided on the surface of any one side. The receiving groove 110 can be formed by removing materials on the surface of the adhesive film body 100 along its thickness direction, and the receiving groove 110 has a bottom wall 111, an opening 112 opposite to the bottom wall 111, and a side wall 113 connected between the bottom wall 111 and the surface of the adhesive film body 100, so as to form a receiving space for storing battery cells. Specifically, the structure or form of the bottom wall 111 and the opening 112 of the receiving groove 110 is not limited, and the side wall 113 is inclined relative to the bottom wall 111 and the surface of the adhesive film body 100, and the inclination angle is not limited. In this way, the inclined side wall 113 can limit the battery cell located in the receiving groove 110 in the receiving groove 110, and is also conducive to the arrangement of the interconnection strip on the battery cell, so as to facilitate the installation and connection of the battery cell.
[0040] The packaging film 10 of the embodiment of the present application is provided with a receiving groove 110 on one side surface of the film body 100, and the side wall 113 of the receiving groove 110 is inclined relative to its bottom wall 111 and the surface of the film body 100, so that the battery cell can be embedded in the receiving groove 110, and relatively firmly fixed, and not easy to slip, thereby avoiding problems such as abnormal spacing between battery cells, and facilitating subsequent welding and fixing. In addition, the inclined side wall 113 of the receiving groove 110 is conducive to the setting of the interconnection strip on the battery cell, which can prevent the interconnection strip from bending and breaking during the lamination process, thereby improving the product yield.
[0041] As described above, the surface shape of the opening 112 of the receiving groove 110 is not limited. In some embodiments, the surface shape of the opening 112 is optionally polygonal or elliptical. Specifically, the surface shape of the opening 112 can be a polygon such as a quadrilateral, pentagon, hexagon, octagon, or an ellipse or a quasi-circle. Figure 1In the illustrated embodiment, the surface shape of the opening 112 is a special quadrilateral, namely a rectangle, which is convenient for matching with the shape of the battery cell and plays a better role in fixing the battery cell.
[0042] Please combine Figure 1 Also see Figures 2 to 3 , the side wall 113 of the receiving groove 110 is inclined relative to the bottom wall 111 and the surface of the film body 100. In some embodiments, optionally, the angle of inclination of the side wall 113 relative to the bottom wall 111 is between 105° and 165°. For example, the angle of inclination of the side wall 113 relative to the bottom wall 111 can be 105°, 110°, 120°, 135°, 150°, 165°, etc. The above data are only examples of the angle of inclination of the side wall 113 relative to the bottom wall 111. In other embodiments, the angle of inclination of the side wall 113 relative to the bottom wall 111 may not be limited to the above examples. By making the side wall 113 inclined relative to the bottom wall 111 at the above angle, the battery cell can be fixed in the receiving groove 110 of the packaging film 10, and the interconnection strips between the battery cells can be prevented from bending and breaking.
[0043] It should be noted that, depending on the different surface shapes of the opening 112 of the receiving groove 110, the number of side walls 113 connected between the bottom wall 111 and the surface of the film body 100 may also be different. On this basis, only a part of the multiple side walls 113 may be inclined relative to the bottom wall 111 and the surface of the film body 100, or all of the side walls 113 may be inclined relative to the bottom wall 111 and the surface of the film body 100, which can be flexibly adjusted according to different application scenarios. Figure 1 In the receiving groove 110 shown, only Figure 2 The side wall 113 is inclined relative to the bottom wall 111 and the surface of the film body 100, and the inclination angle is α. Figure 3 The side wall 113 is inclined relative to the bottom wall 111 and the surface of the film body 100, and the inclination angle is β, which can also be Figure 2 and Figure 3 The side walls 113 are inclined relative to the bottom wall 111 and the surface of the film body 100 , respectively. At this time, the values of α and β may be equal or unequal.
[0044] The receiving groove 110 can be formed on the surface of the film body 100 along the thickness direction thereof by removing material, such as Figure 2As shown, in some embodiments, optionally, the thickness dimension h1 of the adhesive film body 100 is between 0.1mm and 1.5mm. For example, the thickness dimension h1 of the adhesive film body 100 can be 0.1mm, 0.3mm, 0.8mm, 1.2mm, 1.4mm, 1.5mm, etc. The above data are only examples of the thickness dimension h1 of the adhesive film body 100. In other embodiments, the thickness dimension h1 of the adhesive film body 100 may not be limited to the above examples. The thickness of the adhesive film body 100 is moderate, which can form a suitable size of the receiving groove 110 thereon to accommodate the battery cell, and can appropriately reduce the thickness of the packaging adhesive film 10 and reduce its space occupation.
[0045] At the same time, along the thickness direction of the adhesive film body 100, the spacing h2 between the bottom wall 111 and the surface of the adhesive film body 100 is between 50μm and 200μm. For example, the spacing h2 between the bottom wall 111 and the surface of the adhesive film body 100 can be 50μm, 60μm, 75μm, 110μm, 160μm, 180μm, 195μm, 200μm, etc. The above data are only examples of the spacing h2 between the bottom wall 111 and the surface of the adhesive film body 100. In other embodiments, the spacing h2 between the bottom wall 111 and the surface of the adhesive film body 100 may not be limited to the above examples. The spacing h2 between the bottom wall 111 and the surface of the adhesive film body 100 is set in the above range, so that the accommodating groove 110 can match the thickness of the battery cell to better accommodate the battery cell, and it is also conducive to the setting of the interconnection strip between the battery cells. For reference, the thickness of the battery cell is usually between 90μm and 140μm.
[0046] Please continue reading Figure 1 In some embodiments, optionally, a plurality of receiving grooves 110 are provided on the surface of the adhesive film body 100, and the specific number thereof is determined according to the size of the adhesive film body 100. The plurality of receiving grooves 110 are arranged in rows along the first direction and in columns along the second direction. The first direction intersects the second direction, that is, the plurality of receiving grooves 110 are arranged in an array of multiple rows and columns. Figure 1 In the embodiment shown, the first direction is the left-right direction in the figure, and the second direction is the up-down direction in the figure. Figure 2 In the embodiment shown, the first direction is the left-right direction in the figure, and the second direction is the direction perpendicular to the paper surface in the figure. Figure 3 In the illustrated embodiment, the first direction is a direction perpendicular to the paper surface in the figure, and the second direction is a left-right direction in the figure.
[0047] See also Figure 2In some embodiments, optionally, the maximum dimension j of the accommodating groove 110 in the first direction is between 150 mm and 250 mm. Exemplarily, the maximum dimension j of the accommodating groove 110 in the first direction may be 150 mm, 165 mm, 172 mm, 198 mm, 210 mm, 246 mm, 250 mm, etc. The above data are only examples of the maximum dimension j of the accommodating groove 110 in the first direction. In other embodiments, the maximum dimension j of the accommodating groove 110 in the first direction may not be limited to the above examples.
[0048] Please continue reading Figure 2 In some embodiments, optionally, the minimum spacing d1 between two adjacent receiving grooves 110 in the same row in the first direction is between 0.4 mm and 4 mm. Exemplarily, the minimum spacing d1 between two adjacent receiving grooves 110 in the first direction may be 0.4 mm, 0.7 mm, 1 mm, 1.3 mm, 2.8 mm, 3.2 mm, 4 mm, etc. The above data are only examples of the minimum spacing d1 between two adjacent receiving grooves 110 in the first direction. In other embodiments, the minimum spacing d1 between two adjacent receiving grooves 110 in the first direction may not be limited to the above examples.
[0049] See also Figure 3 In some embodiments, optionally, the maximum dimension k of the accommodating slot 110 in the second direction is between 75 mm and 150 mm. Exemplarily, the maximum dimension k of the accommodating slot 110 in the second direction may be 75 mm, 95 mm, 100 mm, 118 mm, 123 mm, 139 mm, 150 mm, etc. The above data are only examples of the maximum dimension k of the accommodating slot 110 in the second direction. In other embodiments, the maximum dimension k of the accommodating slot 110 in the second direction may not be limited to the above examples.
[0050] Please continue reading Figure 3 In some embodiments, optionally, the minimum spacing d2 between two adjacent receiving grooves 110 in the same column in the second direction is between 0.5 mm and 2 mm. Exemplarily, the minimum spacing d2 between two adjacent receiving grooves 110 in the same column in the second direction may be 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.6 mm, 2 mm, etc. The above data are only examples of the minimum spacing d2 between two adjacent receiving grooves 110 in the same column in the second direction. In other embodiments, the minimum spacing d2 between two adjacent receiving grooves 110 in the same column in the second direction may not be limited to the above examples.
[0051] Figure 4 A schematic structural diagram of a photovoltaic assembly provided in one embodiment of the present application is shown.
[0052] Based on the same inventive concept, please refer to Figure 4 The embodiment of the present application further provides a photovoltaic module, which includes a battery cell 20, a front packaging film 30, a back packaging film 40, a front glass 50 and a back plate 60, wherein the front packaging film 30 and the back packaging film 40 can both adopt the packaging film 10 in any of the above embodiments, the front packaging film 30 covers the front side of the battery cell 20, the back packaging film 40 covers the back side of the battery cell 20, the front glass 50 covers the surface of the front packaging film 30 away from the battery cell 20, and the back plate 60 covers the surface of the back packaging film 40 away from the battery cell 20.
[0053] Among them, the battery cell 20 can be arranged in the receiving groove 110 of the front packaging film 30, or in the receiving groove 110 of the back packaging film 40, or in the receiving groove 110 of the front packaging film 30 and the receiving groove 110 of the back packaging film 40 at the same time.
[0054] The battery cell 20 can be a PERC battery (Passivated Emitter and Rear Cell), a TOPCON (Tunnel Oxide Passivated Contact), a HJT (Hereto-junction with Intrinsic Thin-layer) battery, an IBC (Interdigitated Back Contact), a perovskite battery, etc., and can be selected according to actual usage requirements.
[0055] The front glass 50 is used to protect the components, improve the durability and stability of the components, and facilitate light transmission. The main function of the back panel 60 is to protect the battery cells 20, improve the durability and stability of the components. Depending on the material, the back panel 60 can be made of a glass fiber composite material back panel, a fluoroplastic composite material back panel, etc., or a glass back panel to achieve double-sided light transmission.
[0056] The photovoltaic module of the embodiment of the present application is provided with a receiving groove 110 on the surface of one side of the film body 100 of the encapsulating film 10, and the side wall 113 of the receiving groove 110 is inclined relative to the bottom wall 111 and the surface of the film body 100, so that the battery cell 20 can be embedded in the receiving groove 110, and relatively firmly fixed, and not easy to slip, thereby avoiding problems such as abnormal spacing between the battery cells 20, and facilitating subsequent welding and fixing. In addition, the inclined side wall 113 of the receiving groove 110 is conducive to the setting of the interconnection strip on the battery cell 20, which can prevent the interconnection strip from bending and breaking during the lamination process, thereby improving the product yield.
[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0058] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A packaging film, characterized in that: include: The adhesive film body has a receiving groove on one side surface of the adhesive film body, the receiving groove has a bottom wall, an opening opposite to the bottom wall, and a side wall connected between the bottom wall and the surface of the adhesive film body, and the side wall is inclined relative to the bottom wall and the surface of the adhesive film body.
2. The packaging film according to claim 1, characterized in that: The surface shape of the opening is polygonal or elliptical.
3. The packaging film according to claim 1, characterized in that: The side wall is inclined relative to the bottom wall at an angle between 105° and 165°.
4. The packaging film according to claim 1, characterized in that: The thickness of the film body is between 0.1 mm and 1.5 mm; Along the thickness direction of the adhesive film body, the distance between the bottom wall and the surface of the adhesive film body is between 50 μm and 200 μm.
5. The packaging film according to claim 1, characterized in that: A plurality of the accommodating grooves are arranged on the surface of the adhesive film body. The plurality of the accommodating grooves are arranged in rows along a first direction and in columns along a second direction. The first direction intersects with the second direction.
6. The packaging film according to claim 5, characterized in that: The maximum dimension of the accommodating groove in the first direction is between 150 mm and 250 mm.
7. The packaging film according to claim 6, characterized in that: The minimum distance between two adjacent accommodating grooves in the same row in the first direction is between 0.4 mm and 4 mm.
8. The packaging film according to claim 5, characterized in that: The maximum dimension of the accommodating groove in the second direction is between 75 mm and 150 mm.
9. The packaging film according to claim 8, characterized in that: The minimum distance between two adjacent accommodating grooves in the same row in the second direction is between 0.5 mm and 2 mm.
10. A photovoltaic module, characterized in that: include: The encapsulation film according to any one of claims 1 to 9; as well as A battery cell is arranged in the receiving groove.