Composite packaging adhesive film
By introducing a tightly fit PVA layer into the packaging film of the photovoltaic cell module, using its dense hydrogen bond network to block the ions and oxygen, the PID and oxygen intrusion problems of the photovoltaic cell module during service is solved, significantly improving the stability and reliability of the module.
Patent Information
- Application Number
- CN202421370899.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-06-14
AI Technical Summary
Existing photovoltaic cell modules are susceptible to potential-induced attenuation (PID) and oxygen invasion during service, resulting in a decrease in component stability and reliability, and the effectiveness of conventional anti-PID measures is insufficient.
A composite encapsulation film is adopted, including at least one first matrix resin layer and a tightly bonded PVA layer, and the Na+, K+, Cl-plasma and oxygen are blocked through the dense hydrogen bond network of the PVA layer, thereby improving the oxygen barrier and PID resistance of the film.
It achieves more effective barriers to isolation ions and oxygen for photovoltaic cell modules, extends the service life of the modules, and significantly improves the anti-PID performance.
Smart Images
Figure CN222935345U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of photovoltaics, and in particular to a composite encapsulation film with excellent oxygen barrier and anti-PID effects. Background Art
[0002] Crystalline silicon battery modules face challenges in long-term stability and reliability during normal service, which ultimately leads to power attenuation. Among them, potential-induced degradation (PID) is relatively severe. For conventional photovoltaic battery modules, it is generally believed in the industry that the cause of potential-induced degradation is the migration of metal sodium ions. Therefore, the migration of sodium ions can be blocked by enhancing the density of the encapsulation film, thereby reducing the risk of PID failure of the module. Moreover, when oxygen invades the film, it will also cause irreparable damage to the efficacy of the film. Currently, for films with anti-PID effects, the method of adding ions or charge trappers to the matrix resin is generally adopted, so that the relevant ions or charges are captured during the migration process and cannot reach the surface (back surface) of the battery, or the crosslinking density is increased to improve the density of the film, thereby preventing the accumulation of charges on the surface of the battery.
[0003] However, the selection and acquisition of relevant materials are not so easy. It not only requires ion capture ability, but also needs to pay attention to the compatibility with the matrix resin, the influence on the light transmittance of the matrix resin, and the influence on the aging performance of the matrix resin. At the same time, adding relevant ions or charge trappers to the film can only capture the ions or charges that migrate into the film. For those ions or charges remaining on the surface of the battery or passing through the film in large quantities, they do not have the ability to capture or have limited capture ability. As a result, even if ion or charge trappers are used to enhance the anti-PID effect, the effect is still insufficient. Moreover, these added materials do not play any function in the oxygen barrier effect at all.
[0004] For the above reasons, it is necessary to provide an encapsulation film with better anti-PID and oxygen barrier effects for ions or charges passing through the film. Summary of the Utility Model
[0005] In order to improve the oxygen barrier and anti-PID functions of the encapsulation film, the main purpose of the present application is to propose a new composite encapsulation film, and the PVA layer in this composite encapsulation film is used to reflect the ion barrier effect, thereby realizing the extension of the service life of the module using this encapsulation film.
[0006] The present application provides a composite encapsulation film, and the technical means adopted include:
[0007] At least one first matrix resin layer;
[0008] And a PVA layer closely attached to the first matrix resin layer.
[0009] The objectives to be achieved by the composite encapsulation film provided in the application include that the first matrix resin layer is selected from one of EVA, POE, POP, PVB, PP, EAA, SEBS, PE, EMA, and EMMA.
[0010] The objectives to be achieved by the composite encapsulation film provided in the application further include a second matrix resin layer, and the second matrix resin layer is closely attached to the PVA layer.
[0011] The objectives to be achieved by the composite encapsulation film provided in the application include a second matrix resin layer, and the second matrix resin layer is closely attached to the first matrix resin layer.
[0012] The objectives to be achieved by the composite encapsulation film provided in the application include that the second matrix resin layer is selected from one of EVA, POE, POP, PVB, PP, EAA, SEBS, PE, EMA, and EMMA.
[0013] The objectives to be achieved by the composite encapsulation film provided in the application include that the first matrix resin layer is different from the second matrix resin layer.
[0014] Due to the formation of a large number of dense hydrogen bond networks in the PVA film, it has excellent barrier effects on ions such as Na+, K+, and Cl- as well as oxygen. Description of the Drawings
[0015] Figure 1 It is a plan view of the first embodiment of the composite encapsulation film of the present application.
[0016] Figure 2 It is a plan view of the second embodiment of the composite encapsulation film of the present application.
[0017] Figure 3 It is a plan view of the third embodiment of the composite encapsulation film of the present application.
[0018] Figure 4 It is a plan view of the fourth embodiment of the composite encapsulation film of the present application. Detailed Description of the Invention
[0019] The following further describes the present application in detail with reference to the Figure 1-2 drawings.
[0020] Please refer to Figure 1 and Figure 2as shown, which shows the plan views of the first and second embodiments of the composite encapsulation film provided by the present application; as can be seen, in the first embodiment, the composite encapsulation film provided by the present application has at least a first matrix resin layer 10 and a PVA layer 20 tightly bonded to the first matrix resin layer 10. As can be seen from the figure, the first matrix resin layer 10 is tightly bonded to the PVA layer 20, so that in Figure 1 and Figure 2 the first matrix resin layer 10 can be on either side of the PVA layer 20. In the encapsulation film combined in this way, due to the presence of the PVA layer 20, through the excellent oxygen barrier performance of the PVA layer 20, as well as good light transmittance and adhesion performance, high-oxygen-barrier encapsulation can be achieved in the composite encapsulation film provided by the application. Furthermore, the PVA layer 20 also has a good oxygen and Na+ barrier effect, so the method of using the PVA layer 20 to replace the previous POE resin layer can improve the anti-PID performance of the battery cells in the component in the future.
[0021] Furthermore, please refer to Figure 3 and Figure 4 as shown, in which, as can be seen, in addition to the first matrix resin 10 and the PVA layer 20, there is also a second matrix resin layer 30. From Figure 3 the structure shown in it can be seen that the second matrix resin layer 30 is tightly bonded to the PVA layer; and the PVA layer 20 is sandwiched between the first matrix resin layer 10 and the second matrix resin layer 30. And in Figure 4 the structure in it can be seen that the second matrix resin layer 30 is sandwiched between the first matrix resin layer 10 and the PVA layer 20.
[0022] In the above various different embodiments, from the structure visible in the figure, there is at least one layer of the first matrix resin 10 and at least one layer of the second matrix resin 30, and the PVA layer 20 sandwiched between the first matrix resin 10 and the second matrix resin 30; or in the case of the following several embodiments where the PVA layer 20 is respectively bonded to the first matrix resin 10 and the second matrix resin 30 under the premise that the first matrix resin 10 and the second matrix resin 30 are combined with each other, the first matrix resin 10 and the second matrix resin 30 can respectively be selected from one of EVA, POE, POP, PVB, PP, EAA, SEBS, PE, EMA, EMMA. The first matrix resin 10 and the second matrix resin 30 can be selected from the same material or different materials; and when the PVA layer 20 is sandwiched between the first matrix resin 10 and the second matrix resin 30, the first matrix resin 10 and the second matrix resin 30 can be selected from the same material or different materials.
[0023] It should be specifically noted that:
[0024] EVA: The English abbreviation of ethylene-vinyl acetate copolymer;
[0025] POE: The English abbreviation of ethylene-butene copolymer or ethylene-octene copolymer;
[0026] POP: The English abbreviation of vinyl polymer grafted polyether polyol;
[0027] PVB: The English abbreviation of polyvinyl butyral;
[0028] PP: The English abbreviation of polypropylene;
[0029] EAA: The English abbreviation of ethylene acrylic acid copolymer;
[0030] SEBS: The English abbreviation of a linear triblock copolymer with a polystyrene end segment and an ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastic block;
[0031] PE: The English abbreviation of polyethylene;
[0032] EMA: The English abbreviation of ethylene methyl acrylate copolymer;
[0033] EMMA: The English abbreviation of ethylene methyl methacrylate copolymer.
[0034] The above are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.
Claims
1. A composite packaging film, characterized in that ,include: at least one first base resin layer; and a PVA layer tightly attached to the first base resin layer, wherein the first base resin layer is selected from one of EVA, POE, POP, PVB, PP, EAA, SEBS, PE, EMA, and EMMA.
2. The composite packaging film according to claim 1, characterized in that: It also includes a second base resin layer, which is tightly attached to the PVA layer.
3. The composite packaging film according to claim 1, characterized in that: It also includes a second base resin layer, which is tightly attached to the first base resin layer.
4. The composite packaging film according to claim 2 or 3, characterized in that: The second base resin layer is selected from one of EVA, POE, POP, PVB, PP, EAA, SEBS, PE, EMA, and EMMA.
5. The composite packaging film according to claim 2, characterized in that: The first matrix resin layer is different from the second matrix resin layer.