Reflective film tape with novel structure and photovoltaic module

Abstract

The utility model provides a reflective film tape with a novel structure and a photovoltaic module, the reflective film tape comprises a base material, a first reflective layer, a protective layer and a bonding layer which are stacked in sequence, and the base material is located at the bottom layer of the reflective film tape and plays a role in molding and supporting the reflective film tape; and the bonding layer is positioned on the top layer of the reflective film belt and is used for bonding the reflective film belt on the back surfaces of adjacent batteries in the photovoltaic module. The outer surface layer of the reflective film belt has adhesive performance and can be directly adhered to the back edge of an adjacent battery, on one hand, a light source can be directly reflected to a battery piece without passing through a back EVA path, the light source is prevented from being reflected to the back of the battery, more light energy is utilized, and the power of the assembly is further improved; and on the other hand, due to the application of the reflective film belt with the novel structure, the use of a positioning adhesive tape is avoided, and the position between the battery pieces is more stable.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power generation technology, and in particular to a new structure of reflective film strip and photovoltaic module. Background Technology

[0002] A photovoltaic (PV) module is a device that encapsulates photovoltaic cells through certain electrical connections. PV modules convert light energy into electrical energy, and maximizing the absorption of light energy is a crucial means of increasing the module's power generation capacity.

[0003] Traditional photovoltaic modules are mainly crystalline silicon modules, which output electrical performance by regularly connecting crystalline silicon solar cells. There are gaps between the solar cells, and in order to make full use of light energy, the non-solar cell areas between the cells are generally designed to be opaque, such as by applying a reflective film to the back glass. The reflective interface is designed on the back glass or backsheet material.

[0004] As disclosed in patents CN118116992A, CN221660296U, and CN208622752U, although photovoltaic modules utilize cell gap reflective technology, the reflective film is attached to the back glass or backsheet. The principle of the reflective film is to reflect light that hits the film layer back onto the solar cells, thereby increasing the power generation of the photovoltaic module. However, with the design of photovoltaic modules, the gaps between the cells are becoming smaller and smaller, even below 0.9mm. An EVA layer still exists between the solar cells and the reflective film on the back glass. This adhesive layer still has a certain thickness, generally 0.3mm-0.5mm. The light reflected from the gaps onto the reflective film and then reflected back to the solar cells must pass through the EVA layer. This results in a certain proportion of light energy hitting the back or longitudinal surface of the solar cells. The power generation efficiency of the back or longitudinal surface is far lower than the light absorption efficiency of the front surface, effectively preventing the reuse of some light sources. This, in turn, weakens the effect of increasing the power output of the photovoltaic module. Utility Model Content

[0005] The present invention aims to provide a new structure of reflective film strip and photovoltaic module to solve the problem that the power output of photovoltaic module is reduced due to the inability to reuse some light sources in the prior art.

[0006] According to one aspect of the present invention, a novel reflective film strip is provided, the reflective film strip comprising a substrate, a first reflective layer, a protective layer and an adhesive layer stacked sequentially, wherein the substrate is located at the bottom layer of the reflective film strip and serves to support the formation of the reflective film strip; the adhesive layer is located at the top layer of the reflective film strip and is used to adhere the reflective film strip to the back of adjacent cells in a photovoltaic module.

[0007] Optionally, the widths of the substrate, the first reflective layer, the protective layer, and the adhesive layer are equal.

[0008] Optionally, the protective layer and the adhesive layer are integrally formed, and the whole is an adhesive protective layer formed of insulating, UV-resistant, highly transparent and adhesive materials, which has both protective and adhesive functions.

[0009] Optionally, a second reflective layer is provided on the back side of the substrate.

[0010] Optionally, the first reflective layer and / or the second reflective layer is a silver-white aluminum layer, a white reflective layer containing TiO2, or a black reflective layer containing black substances.

[0011] According to another aspect of the present invention, a photovoltaic module is provided, comprising a rear cover glass or back sheet, a rear encapsulating film, a battery layer, a front transparent encapsulating film, and a front cover glass stacked together, wherein the rear cover glass or back sheet is located at the bottom layer of the photovoltaic module, and the front cover glass is located at the top layer of the photovoltaic module.

[0012] The battery layer includes a plurality of spaced-apart battery cells, and a reflective film strip as described above is provided in the gap between two adjacent battery cells, and the reflective film strip is attached to the back edge of the two adjacent battery cells by an adhesive layer.

[0013] This invention proposes a novel reflective film strip and photovoltaic module. By adding an adhesive layer to the outer surface of the reflective film strip, it acquires adhesive properties and can be directly attached to the back edge of adjacent cells. Firstly, the light source can be directly reflected onto the cell, bypassing the back EVA path and preventing reflection onto the back of the cell, thus maximizing light energy utilization and increasing module power. Secondly, the application of this novel reflective film strip eliminates the need for positioning tape, resulting in more stable cell placement. Furthermore, this novel reflective film strip can be designed with a double-sided reflective structure. When light from the back of the module shines on the reflective film strip, it is further reflected onto the back of the cell, further improving the power generation performance of bifacial modules.

[0014] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 A schematic diagram of the new reflective film strip structure provided in this embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the photovoltaic module structure provided in an embodiment of the present utility model;

[0018] Among them, 10-reflective film strip, 11-substrate, 12-first reflective layer, 13-protective layer, 14-adhesive layer, 20-rear cover glass or back plate, 30-rear adhesive film, 40-battery cell, 50-front transparent adhesive film, 60-front cover glass. Detailed Implementation

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] This utility model embodiment provides a novel reflective film strip 10. The reflective film strip is typically used between solar cells and adhered to the inner surface of the glass on the back of the module. By creating specific textures on the film strip, directional reflection to the cell surface is increased, thereby improving the module's power output. Figure 1As shown, the reflective film strip 10 includes a substrate 11, a first reflective layer 12, a protective layer 13, and an adhesive layer 14 stacked sequentially. The substrate 11, located at the bottom of the reflective film strip 10, is generally a PET structure and serves as a support for the formation of the reflective film strip 10. The adhesive layer 14, located at the top of the reflective film strip 10, is used to adhere the reflective film strip to the back of adjacent cells in the photovoltaic module. This can further replace the positioning tape used in existing production technologies, thereby improving the module's power generation efficiency while reducing material costs. The adhesive layer 14, generally a pressure-sensitive adhesive, has properties such as adhesion, high transmittance, and UV resistance, and is adhered to the edge of the back of the cell. The protective layer 13 is generally a resin with a certain degree of hardness and has properties such as high transmittance, insulation, and UV resistance. In this embodiment of the invention, the reflective film strip 10 is adhered to the back of the cell. By reducing the path of light passing through the back adhesive film, it increases the light energy reflected to the front of the cell, thereby improving the module's power.

[0024] like Figure 1 As shown, the substrate 11, the first reflective layer 12, the protective layer 13, and the adhesive layer 14 in the reflective film strip 10 have equal widths.

[0025] In an optional embodiment of this utility model, the protective layer 13 and the adhesive layer 14 are integrally formed, and the entire protective layer 13 is formed of an insulating, UV-resistant, highly transparent, and adhesive material, possessing both protective and adhesive functions. In other words, the new structure of the reflective film strip 10 of this utility model embodiment, by setting the protective layer 13 and the adhesive layer 14 on the first reflective layer 12, can combine the two into one layer.

[0026] In this embodiment, a second reflective layer is provided on the back side of the substrate 11. The reflective film strip 10 of this embodiment can also be made into a double-sided reflective structure. It is not limited by the reflective structure and can be applied in any way, improving the power generation efficiency on the front side while also improving the power generation efficiency on the back side.

[0027] In practical applications, the color and material of the reflective layer are not limited. As a preferred option, the first reflective layer 12 and / or the second reflective layer in this embodiment can be silver-white, white, or black. Silver-white is generally an aluminum layer, white is a white substance containing TiO2, and black is a black material.

[0028] This utility model embodiment also provides a photovoltaic module, such as... Figure 2As shown, the photovoltaic module of this utility model embodiment includes a back cover glass or backplate 20, a back adhesive film 30, a battery layer, a front transparent adhesive film 50, and a front cover glass stacked together. The back cover glass or backplate 20 is located at the bottom layer of the photovoltaic module, and the front cover glass is located at the top layer of the photovoltaic module. The battery layer includes a plurality of spaced-apart battery cells 40. A reflective film strip 10 as described in the above embodiment is provided in the gap between two adjacent battery cells 40, and the reflective film strip 10 is attached to the back edge of the two adjacent battery cells 40 through an adhesive layer 14.

[0029] This invention primarily designs a novel reflective film strip 10 to improve the power of photovoltaic modules and its application in a new structural module. The main solution involves attaching the reflective film strip 10 to the back of the solar cell 40, allowing direct contact between the reflective film strip 10 and the solar cell 40. This avoids the conventional structure where there is still a back adhesive film between the reflective film and the cell, further reducing the reflection path. With a limited spacing between cells, this reduces the absorption and reflection of light on the back of the cell, while reflecting more light energy to the front, increasing the light energy absorbed by the solar cell 40 and thus increasing the module power. Simultaneously, the novel reflective film strip 10 is designed with an insulating pressure-sensitive adhesive or hot melt adhesive coated on the reflective layer 12, facilitating the attachment of the reflective side of the reflective film strip 10 to the cell. Meanwhile, conventional module positioning tape is dispersed and attached to the back of the cell. The design and application of this novel reflective film strip 10 also serves as a replacement for conventional module positioning tape.

[0030] For the current industry design of small battery cells with a spacing of 40mm and less than 0.9mm, the reflective film, when pasted on the back glass or back panel, results in significant light loss when it reaches the front of the battery, with some light reflected to the back of the battery, leading to severe light energy loss. This invention proposes a new structure for the reflective film strip 10 and its application in a new component. An adhesive layer 14 is provided outside the reflective layer 12, allowing direct pasting to the back edge of adjacent batteries. This avoids light energy reflection through the back EVA to the back of the battery, reducing light energy loss and positively impacting component power.

[0031] This utility model proposes a new structure of reflective film tape and application of a new structural component, which can be directly pasted onto the back edge of adjacent batteries to fix the relative position of the battery cells, thereby further eliminating the need for positioning tape in the prior art and further reducing costs.

[0032] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A new construction of a reflective film tape, characterized by, The reflective film strip (10) includes a substrate (11), a first reflective layer (12), a protective layer (13), and an adhesive layer (14) stacked in sequence. The substrate (11) is located at the bottom layer of the reflective film strip (10) and serves as a support for the formation of the reflective film strip (10). The adhesive layer (14) is located at the top layer of the reflective film strip (10) and is used to attach the reflective film strip to the back of adjacent cells in the photovoltaic module.

2. The new construction retroreflective film strip of claim 1, wherein The widths of the substrate (11), the first reflective layer (12), the protective layer (13), and the adhesive layer (14) are equal.

3. The new construction retroreflective film strip of claim 1, wherein The protective layer (13) and the adhesive layer (14) are integrally formed, and the whole is an adhesive protective layer (13) formed by insulating, UV resistant, high transmittance and adhesive materials, which has both protective and adhesive functions.

4. The new construction retroreflective film strip of any one of claims 1-3, wherein, A second reflective layer is provided on the back side of the substrate (11).

5. The new construction reflective film strip of claim 4, wherein The first reflective layer (12) and / or the second reflective layer is a silver-white aluminum layer, a white reflective layer containing TiO2, or a black reflective layer containing black substances.

6. A photovoltaic module, characterized by The photovoltaic module includes a back cover glass or backplate (20), a back adhesive film (30), a battery layer, a front transparent adhesive film (50), and a front cover glass, which are stacked together. The back cover glass or backplate (20) is located at the bottom layer of the photovoltaic module, and the front cover glass is located at the top layer of the photovoltaic module. The battery layer includes a plurality of spaced battery cells (40), and a reflective film strip (10) according to any one of claims 1-5 is provided between two adjacent battery cells (40), and the reflective film strip (10) is attached to the back edge of the two adjacent battery cells (40) by an adhesive layer (14).

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