Structure for improving power of photovoltaic module

Abstract

The utility model discloses a structure for improving the power of a photovoltaic module. The photovoltaic module comprises front glass, and a front packaging adhesive film, a battery layer, a back packaging adhesive film and back glass which are sequentially stacked on the front glass. The photovoltaic module further comprises a reflective film attached to the periphery of the photovoltaic module. According to the structure capable of improving the power of the photovoltaic module, the reflective film is attached to the periphery of the photovoltaic module, so that a light reflection path in the module is increased, light originally escaping from the periphery of the module is reflected again by the reflective film, light captured by the battery layer is increased, and the power of the photovoltaic module is improved. And the power generation power of the assembly is improved. Meanwhile, the reflective film is attached to the periphery of the photovoltaic module, so that the interior of the module can be sealed, water vapor is prevented from permeating into the module from the periphery of the module, the effect of isolating the water vapor is achieved, and the problem that the interior of the module is delaminated due to water vapor erosion can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic modules, and particularly relates to a structure for improving the power of photovoltaic modules. Background Art

[0002] With the rapid development of the photovoltaic industry, improving the power of photovoltaic modules has also become the goal pursued by the photovoltaic industry. Generally speaking, a photovoltaic module is a laminated structure, which includes glass, encapsulant film, a photovoltaic cell layer, and a backsheet. In order to improve the efficiency of photovoltaic modules, most of the existing technologies start from the perspective of photovoltaic cells and strive to improve the photoelectric conversion efficiency of photovoltaic cells to achieve the purpose of improving the power of photovoltaic modules, while ignoring the influence of the structure of photovoltaic modules itself on the power of the modules. The current structure design of photovoltaic modules has a low utilization rate of light, which affects the overall power of the modules. In addition, photovoltaic modules also face environmental problems during long-term outdoor use. The existing structure of photovoltaic modules is prone to problems such as the internal part of the module being eroded by water vapor during long-term outdoor use, resulting in delamination of the module, which not only affects the power of the module but also affects the service life of the module. Summary of the Utility Model

[0003] The purpose of the utility model is to design a structure for improving the power of photovoltaic modules in view of the fact that the existing structure design of photovoltaic modules has a certain influence on the power of the modules, and in view of the problem that the existing structure of photovoltaic modules is prone to being eroded by water vapor inside the module during long-term outdoor use, resulting in delamination of the module. This structure can not only improve the power generation power of the module but also prevent the module from delaminating.

[0004] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0005] The utility model designs a structure for improving the power of photovoltaic modules. The photovoltaic module includes a front glass, and a front encapsulant film, a cell layer, a back encapsulant film, and a back glass that are sequentially laminated on the front glass; it also includes a reflective film attached to the periphery of the photovoltaic module.

[0006] Further, a structure for improving the power of photovoltaic modules: the thickness of the reflective film is set to 1.0 - 5.0 mm.

[0007] Furthermore, a structure for improving the power of photovoltaic modules: the reflectivity of the reflective film > 90%.

[0008] Further, a structure for improving the power of photovoltaic modules: the front encapsulant film and the back encapsulant film are selected from POE encapsulant film, EVA encapsulant film, or light conversion encapsulant film.

[0009] Specifically, the light conversion adhesive film refers to a type of adhesive film doped with, for example, CdS quantum dots, CdSe quantum dots, and ZnS quantum dots in a matrix adhesive film.

[0010] Furthermore, a structure for improving the power of a photovoltaic module: the haze of the front encapsulation adhesive film is 2.0 - 4.0%.

[0011] Advantages of the present utility model:

[0012] A structure designed by the present utility model that can improve the power of a photovoltaic module. By attaching a reflective film around the photovoltaic module, it increases the internal light reflection path of the module, reflects the light that originally escaped from the periphery of the module using this reflective film, and thus increases the light captured by the battery layer, which is beneficial to the improvement of the power generation power of the module. At the same time, by attaching a reflective film around the photovoltaic module, the present utility model can also play a role in sealing the inside of the module, thereby reducing the penetration of water vapor into the inside of the module from its periphery, playing a role in isolating water vapor, and thus avoiding the problem of delamination of the module due to internal water vapor erosion.

[0013] The structure designed by the present utility model that can improve the power of a photovoltaic module has a two - birds - with - one - stone effect. It can not only improve the power of the module but also reduce the entry of water vapor into the inside of the module to prevent delamination of the module. In addition, by optimizing the haze of the front encapsulation adhesive film, the present utility model can further achieve the effect of improving the power of the module. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 It is a layered schematic diagram of a structure for improving the power of a photovoltaic module designed for Embodiment 1 of the present utility model.

[0016] Markings in the figure: 1 - front glass, 2 - front encapsulation adhesive film, 3 - battery layer, 4 - back encapsulation adhesive film, 5 - back glass, 6 - reflective film. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0019] Embodiment 1

[0020] As Figure 1 shown, a structure for improving the power of a photovoltaic module is provided. The photovoltaic module includes a front glass 1, and a front encapsulation film 2, a battery layer 3, a back encapsulation film 4, and a back glass 5 that are sequentially stacked on the front glass 1. It also includes a reflective film 6 attached to the periphery of the photovoltaic module; the thickness of the reflective film 6 is set to 4.0 mm, and the reflectivity of the reflective film 6 > 90%; the haze of the front encapsulation film 2 is 3.0%; both the front encapsulation film 2 and the back encapsulation film 4 are made of EVA film; the size of the photovoltaic module is 203 * 190 mm, and the size of the battery layer 3 is 182 * 182 mm.

[0021] Embodiment 2

[0022] Provided is a structure for improving the power of a photovoltaic module. The photovoltaic module includes a front glass 1, and a front encapsulation film 2, a battery layer 3, a back encapsulation film 4, and a back glass 5 that are sequentially stacked on the front glass 1. It also includes a reflective film 6 attached to the periphery of the photovoltaic module. The thickness of the reflective film 6 is set to 4.0 mm, and the reflectivity of the reflective film 6 > 90%. The haze of the front encapsulation film 2 is 3.0%. The front encapsulation film 2 is a light conversion film (the light conversion film is a film doped with 0.5 wt% CdS quantum dots in an EVA film), and the back encapsulation film 4 is an EVA film. The size of the photovoltaic module is 203 * 190 mm, and the size of the battery layer 3 is 182 * 182 mm.

[0023] Comparative Example 1

[0024] Provided is a photovoltaic module, which includes a front glass 1, and a front encapsulation film 2, a battery layer 3, a back encapsulation film 4, and a back glass 5 that are sequentially stacked on the front glass 1. The haze of the front encapsulation film 2 is 3.0%. Both the front encapsulation film 2 and the back encapsulation film 4 are EVA films.

[0025] The difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, the reflective film 6 is not provided around the module, and the rest is the same as in Example 1.

[0026] Comparative Example 2

[0027] Provided is a structure for improving the power of a photovoltaic module. The photovoltaic module includes a front glass 1, and a front encapsulation film 2, a battery layer 3, a back encapsulation film 4, and a back glass 5 that are sequentially stacked on the front glass 1. It also includes a reflective film 6 attached to the periphery of the photovoltaic module. The thickness of the reflective film 6 is set to 4.0 mm, and the reflectivity of the reflective film 6 > 90%. The haze of the front encapsulation film 2 is 1.0%. Both the front encapsulation film 2 and the back encapsulation film 4 are EVA films. The size of the photovoltaic module is 203 * 190 mm, and the size of the battery layer 3 is 182 * 182 mm.

[0028] The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, the haze of the front encapsulation film 2 is lower than that in Example 1, and the rest is the same as in Example 1.

[0029] Comparative Example 3

[0030] Provided is a structure for improving the power of a photovoltaic module. The photovoltaic module includes a front glass 1, and a front encapsulation film 2, a battery layer 3, a back encapsulation film 4, and a back glass 5 that are sequentially stacked on the front glass 1. It also includes a reflective film 6 attached to the periphery of the photovoltaic module; the thickness of the reflective film 6 is set to 4.0 mm, and the reflectivity of the reflective film 6 > 90%; the haze of the front encapsulation film 2 is 6.0%; both the front encapsulation film 2 and the back encapsulation film 4 are made of EVA film; the size of the photovoltaic module is 203 * 190 mm, and the size of the battery layer 3 is 182 * 182 mm.

[0031] The difference between Comparative Example 3 and Example 1 is that the haze of the front encapsulation film 2 in Comparative Example 3 is relatively higher than that in Example 1, and the rest is the same as in Example 1.

[0032] Test:

[0033] Test the current density and power of the photovoltaic modules of the above Examples 1 - 2 and Comparative Examples 1 - 3, and the test results are as follows:

[0034] <![CDATA[Current density (A / cm 2 )]]> Power (W) Example 1 0.0448 5.689 Example 2 0.0455 5.731 Comparative Example 1 0.0435 5.638 Comparative Example 2 0.0439 5.653 Comparative Example 3 0.0441 5.667

[0035] It can be seen from the test data of Example 1 and Comparative Example 1 above that the present invention effectively improves the power of the module by setting a reflective film around the photovoltaic module. It can be seen from the test data of Example 1 and Comparative Examples 2 and 3 that the present invention also achieves the effect of further improving the power of the module by optimizing the haze of the front encapsulation film.

[0036] The above are the preferred embodiments of the present invention, which are only used to explain the present invention and are not used to limit the present invention. Any obvious changes or variations derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A structure for increasing the power of a photovoltaic module, characterized in that: The photovoltaic module comprises a front glass (1), and a front packaging film (2), a battery layer (3), a back packaging film (4) and a back glass (5) which are sequentially stacked on the front glass (1); and also comprises a reflective film (6) attached to the four sides of the photovoltaic module.

2. A structure for increasing the power of a photovoltaic module according to claim 1, characterized in that: The thickness of the reflective film (6) is set to 1.0-5.0 mm.

3. A structure for increasing the power of a photovoltaic module according to claim 1 or 2, characterized in that: The reflectivity of the reflective film (6) is greater than 90%.

4. A structure for increasing the power of a photovoltaic module according to claim 1, characterized in that: The front packaging film (2) and the back packaging film (4) are selected from POE film, EVA film or light conversion film.

5. A structure for increasing the power of a photovoltaic module according to claim 1 or 4, characterized in that: The haze of the front packaging film (2) is 2.0-4.0%.

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