Packaging adhesive film and photovoltaic module
By introducing a wavelength conversion layer and an ultraviolet cutoff layer into the packaging film of the photovoltaic module, the problem of insufficient resistance to ultraviolet light of solar cells is solved, and the effect of improving the performance and output power of the photovoltaic module is achieved.
Patent Information
- Application Number
- CN202420243154.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-31
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-01-31
AI Technical Summary
Solar cells have low tolerance to ultraviolet light. Traditional ultraviolet cutoff films lead to low battery power. The wavelength converter is easy to decompose under high temperature and high humidity conditions, and it is impossible to achieve wavelength conversion and ultraviolet cutoff functions at the same time.
A packaged adhesive film is adopted, including a wavelength conversion layer and an ultraviolet cutoff layer. The wavelength conversion layer converts ultraviolet light with a wavelength less than 380nm into visible and infrared light, and the ultraviolet cutoff layer absorbs the remaining ultraviolet light.
Effectively protect the performance of photovoltaic modules, ensure output power, and improve the stability and reliability of the modules.
Smart Images
Figure CN222509873U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaics, in particular to a packaging adhesive film and a photovoltaic component. Background Art
[0002] With the development of photovoltaic product technology in recent years, new technical routes have been continuously improved and upgraded, product efficiency has gradually increased, and the market scale has gradually expanded. It can be foreseen that photovoltaic products will become one of the main sources of clean energy in the future. However, the problem of solar cell packaging has always been a problem that has plagued the industry. The main problem is that the solar cell itself has a low tolerance to ultraviolet light. For example, heterojunction solar cells will cause certain damage to the internal structure of the cell when ultraviolet light with a wavelength below 365nm, resulting in reduced product output performance. Traditional technology uses a UV cutoff film on the inner layer of the front film of the solar cell, but the UV cutoff film used by the solar cell will cause the cell power to be low. In response to the low battery power caused by the UV cutoff film, the prior art has also proposed adding wavelength converters or UV absorbers to achieve wavelength conversion or UV cutoff functions. However, the wavelength converter is unstable and easily decomposed under high temperature and high humidity conditions. There are also problems such as the degradation of the wavelength conversion agent under long-term UV conditions and the low UV cutoff ability of the wavelength conversion film itself. The wavelength converter and the UV absorber will affect each other and cannot work at the same time. Therefore, it is impossible to add two materials to the same film to achieve different functions respectively. Furthermore, when using a UV absorber, the UV transmittance can be achieved below 2%, and the product reliability can be guaranteed, but the product output power will still be greatly reduced. Utility Model Content
[0003] Based on this, it is necessary to provide a packaging film. The packaging film of the utility model can guarantee the output performance of the photovoltaic module to the greatest extent and improve the reliability of the photovoltaic module.
[0004] An embodiment of the present application provides a packaging film.
[0005] A packaging film includes a packaging film, the packaging film includes a wavelength conversion layer and an ultraviolet cutoff layer. When the packaging film is used for battery cell packaging, the wavelength conversion layer is attached to the panel, and the ultraviolet cutoff layer is attached to the battery cell, wherein the wavelength conversion layer can convert ultraviolet light with a wavelength less than 380nm into visible light and infrared light with a wavelength of 380nm~1200nm.
[0006] In some embodiments, the wavelength conversion layer and the ultraviolet cutoff layer are independent of each other and are connected in a stacked manner; or the wavelength conversion layer and the ultraviolet cutoff layer are connected to form a composite film structure.
[0007] In some of the embodiments, the average transmittance of the wavelength conversion layer in the wavelength range of 280nm-380nm is lower than the average transmittance in the wavelength range of 380nm-1200nm.
[0008] In some of the embodiments, the average transmittance of the ultraviolet cutoff layer in the wavelength range of 280nm~380nm is lower than the average transmittance in the wavelength range of 380nm~1200nm.
[0009] In some of the embodiments, the average transmittance of the wavelength conversion layer in the wavelength range of 280nm~380nm is greater than 5%.
[0010] In some of the embodiments, the average transmittance of the ultraviolet cut-off layer in the wavelength range of 280nm~380nm is less than 30%.
[0011] In some of the embodiments, the average transmittance of the wavelength conversion layer and the ultraviolet cut-off layer in the wavelength range of 300nm to 1200nm is greater than 80%.
[0012] In some embodiments, the wavelength conversion layer has a thickness of 100 μm to 1000 μm.
[0013] In some embodiments, the thickness of the ultraviolet cutoff layer is 30 μm to 500 μm.
[0014] In some embodiments, the wavelength conversion layer is made of EVA, POE, a multilayer composite material of EVA and POE, or other high molecular polymer materials.
[0015] In some embodiments, the UV cutoff layer is made of EVA, POE, a multilayer composite material of EVA and POE, or other high molecular polymer materials.
[0016] A photovoltaic module comprises a cell and the above-mentioned encapsulation film, wherein the encapsulation film is used to encapsulate the cell, wherein the wavelength conversion layer is attached to the panel, and the ultraviolet cutoff layer is attached to the cell.
[0017] In some of the embodiments, the photovoltaic module further includes a front panel and a back panel, and the photovoltaic module includes a front panel, a packaging film, a battery cell, a packaging film, and a back panel that are sequentially stacked and connected.
[0018] The encapsulation film of the present application converts most of the ultraviolet light into visible light or infrared light through the wavelength conversion layer, and then absorbs and cuts off the remaining ultraviolet light through the ultraviolet cutoff layer. Since the ultraviolet absorber only absorbs light in the ultraviolet band and has no effect on visible light and infrared light, the encapsulation film of the present application can not only ensure the performance of the photovoltaic module, but also ensure the output power of the photovoltaic module, thereby improving the stability and reliability of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.
[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.
[0021] FIG1 is a schematic diagram of a packaging film according to an embodiment of the present invention;
[0022] FIG. 2 is a schematic diagram of a packaging film according to another embodiment of the present invention.
[0023] Description of Reference Numerals
[0024] 10. Encapsulation film; 101. Wavelength conversion layer; 102. UV cutoff layer; 20. Photovoltaic module; 100. Front panel; 200. Solar cell; 300. Back panel. DETAILED DESCRIPTION
[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model 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 utility model. However, the utility model 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 utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0026] In the description of the present invention, it should be understood that 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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 the present invention can be understood according to specific circumstances.
[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a 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.
[0029] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0031] In the present disclosure, the front side refers to the light-receiving side, and the back side refers to the backlight side, wherein the "light-receiving side" and "backlight side" are only used to distinguish the locations of the two opposite surfaces of the battery substrate. In actual working conditions, the "light-receiving side" is the surface of the battery substrate that mainly receives light, but the "backlight side" does not necessarily not receive light. On the contrary, due to the existence of diffusely reflected light, the "backlight side" can also receive light in actual working conditions.
[0032] The present application provides a packaging film 10 to solve at least one of the following problems: the low UV tolerance of solar cells; the problem of low battery power caused by using UV cut-off films in conventional technologies; the problem of easy decomposition under high temperature and high humidity conditions caused by adding wavelength conversion agents; and the problem of significant reduction in battery output power caused by adding UV absorbers. The packaging film 10 will be described below in conjunction with the accompanying drawings.
[0033] The encapsulation film 10 provided in the embodiment of the present application is exemplified as shown in Figure 1, which is a schematic diagram of the structure of the encapsulation film 10 provided in the embodiment of the present application. The encapsulation film 10 of the present application can be used for solar cell encapsulation.
[0034] In order to more clearly illustrate the structure of the packaging film 10 , the packaging film 10 will be introduced below with reference to the accompanying drawings.
[0035] For example, please refer to FIG. 1 , which is a schematic diagram of the structure of a packaging film 10 provided in an embodiment of the present application.
[0036] A packaging film 10 includes a packaging film 10, and the packaging film 10 includes a wavelength conversion layer 101 and an ultraviolet cutoff layer 102. When the packaging film 10 is used for packaging a battery cell 200, the wavelength conversion layer 101 is attached to the panel, and the ultraviolet cutoff layer 102 is attached to the battery cell 200. The wavelength conversion layer 101 can convert ultraviolet light with a wavelength less than 380nm into visible light and infrared light with a wavelength of 380nm to 1200nm.
[0037] In some embodiments, as shown in Fig. 1, the wavelength conversion layer 101 and the ultraviolet cutoff layer 102 are independent of each other and are stacked. Alternatively, as shown in Fig. 2, Fig. 2 is a schematic diagram of a packaging film 10 of another embodiment of the utility model, and the wavelength conversion layer 101 and the ultraviolet cutoff layer 102 are connected to form a composite film structure.
[0038] In some embodiments, the average transmittance of the wavelength conversion layer 101 in the wavelength range of 280 nm to 380 nm is lower than the average transmittance in the wavelength range of 380 nm to 1200 nm.
[0039] In some embodiments, the average transmittance of the ultraviolet cutoff layer 102 in the wavelength range of 280 nm to 380 nm is lower than the average transmittance in the wavelength range of 380 nm to 1200 nm.
[0040] In some embodiments, the average transmittance of the wavelength conversion layer 101 in the wavelength range of 280 nm to 380 nm is greater than 5%.
[0041] In some embodiments, the average transmittance of the UV cutoff layer 102 in the wavelength range of 280 nm to 380 nm is less than 30%.
[0042] In some embodiments, the average transmittance of the wavelength conversion layer 101 and the ultraviolet cut-off layer 102 in the wavelength range of 300 nm to 1200 nm is greater than 80%.
[0043] In some embodiments, the thickness of the wavelength conversion layer 101 is 100 μm to 1000 μm. For example, the thickness of the wavelength conversion layer 101 can be 100 μm; for another example, the thickness of the wavelength conversion layer 101 can be 1000 μm. It is not difficult to understand that in other embodiments, the thickness of the wavelength conversion layer 101 can also be 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm or other values.
[0044] In some embodiments, the thickness of the ultraviolet cutoff layer 102 is 30 μm to 500 μm. For example, the thickness of the ultraviolet cutoff layer 102 can be 30 μm; for another example, the thickness of the ultraviolet cutoff layer 102 can be 500 μm. It is not difficult to understand that in other embodiments, the thickness of the ultraviolet cutoff layer 102 can also be 50 μm, 100 μm, 200 μm, 300 μm, 400 μm or other values.
[0045] In some embodiments, the wavelength conversion layer 101 is made of EVA, POE, EVA and POE multilayer composite materials or other high molecular polymer materials. Correspondingly, the wavelength conversion layer 101 can be an EVA layer, a POE layer, an EVA and POE composite layer or other high molecular polymer material layer prepared from EVA, POE, EVA and POE multilayer composite materials or other high molecular polymer materials.
[0046] In some embodiments, the UV cutoff layer 102 is made of EVA, POE, EVA and POE multilayer composite material or other high molecular polymer material. Correspondingly, the UV cutoff layer 102 can be an EVA layer, a POE layer, an EVA and POE composite layer or other high molecular polymer material layer prepared from EVA, POE, EVA and POE multilayer composite material or other high molecular polymer material.
[0047] A photovoltaic module 20 includes a cell 200 and the above-mentioned encapsulation film 10. The encapsulation film 10 is used to encapsulate the cell 200, wherein the wavelength conversion layer 101 is attached to the panel, and the ultraviolet cutoff layer 102 is attached to the cell 200.
[0048] In some embodiments, the photovoltaic module 20 further includes a front panel 100 and a back panel 300. The photovoltaic module 20 includes the front panel 100, the encapsulation film 10, the cell 200, the encapsulation film 10, and the back panel 300 which are sequentially stacked and connected. The encapsulation film 10 located on the front of the photovoltaic module 20 uses the above-mentioned encapsulation film 10. It should be noted that the encapsulation film 10 located on the back of the photovoltaic module 20 can be the above-mentioned encapsulation film 10 or a common film, which refers to a film that does not contain a wavelength conversion layer 101 and an ultraviolet cutoff layer 102.
[0049] The packaging film 10 of the present application converts most of the ultraviolet light into visible light or infrared light through the wavelength conversion layer 101, and then absorbs and cuts off the remaining ultraviolet light through the ultraviolet cutoff layer 102. Since the ultraviolet absorber only absorbs light in the ultraviolet band and has no effect on visible light and infrared light, the packaging film 10 of the present application can not only ensure the performance of the photovoltaic module 20, but also ensure the output power of the photovoltaic module 20, thereby achieving the purpose of improving the stability and reliability of the photovoltaic module 20.
[0050] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0051] 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.
[0052] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A packaging film (10), characterized in that: The packaging adhesive film (10) comprises a wavelength conversion layer (101) and an ultraviolet cutoff layer (102); when the packaging adhesive film (10) is used for packaging a battery cell (200), the wavelength conversion layer (101) is adhered to a panel, and the ultraviolet cutoff layer (102) is adhered to the battery cell (200); wherein the wavelength conversion layer (101) is capable of converting ultraviolet light with a wavelength less than 380 nm into visible light and infrared light with a wavelength of 380 nm to 1200 nm.
2. The packaging adhesive film (10) according to claim 1, characterized in that: The wavelength conversion layer (101) and the ultraviolet cut-off layer (102) are independent of each other and are connected in a stacked manner; or the wavelength conversion layer (101) and the ultraviolet cut-off layer (102) are connected to form a composite film structure.
3. The packaging adhesive film (10) according to claim 1, characterized in that: The average transmittance of the wavelength conversion layer (101) in the wavelength range of 280nm to 380nm is lower than the average transmittance in the wavelength range of 380nm to 1200nm.
4. The packaging adhesive film (10) according to claim 1, characterized in that: The average transmittance of the ultraviolet cutoff layer (102) in the wavelength range of 280 nm to 380 nm is lower than the average transmittance in the wavelength range of 380 nm to 1200 nm.
5. The packaging adhesive film (10) according to claim 1, characterized in that: The wavelength conversion layer (101) has an average transmittance greater than 5% in the wavelength range of 280 nm to 380 nm.
6. The packaging adhesive film (10) according to claim 1, characterized in that: The average transmittance of the ultraviolet cutoff layer (102) in the wavelength range of 280 nm to 380 nm is less than 30%.
7. The packaging adhesive film (10) according to any one of claims 1 to 6, characterized in that: The average transmittance of the wavelength conversion layer (101) and the ultraviolet cut-off layer (102) in the wavelength range of 300 nm to 1200 nm is greater than 80%.
8. The packaging adhesive film (10) according to any one of claims 1 to 6, characterized in that: The wavelength conversion layer (101) has a thickness of 100 μm to 1000 μm.
9. The packaging adhesive film (10) according to any one of claims 1 to 6, characterized in that: The ultraviolet cutoff layer (102) has a thickness of 30 μm to 500 μm.
10. A photovoltaic module (20), characterized in that: The invention comprises a battery cell (200) and a packaging film (10) as claimed in any one of claims 1 to 9, wherein the packaging film (10) is used to package the battery cell (200), wherein the wavelength conversion layer (101) is adhered to a panel, and the ultraviolet cutoff layer (102) is adhered to the battery cell (200).