High-efficiency photovoltaic module

Abstract

The utility model provides a high-efficiency photovoltaic module, which comprises double-coated glass, a front film, a battery layer, a high-reflection layer, a rear film and a rear plate which are sequentially laminated from top to bottom, the battery layer comprises a plurality of battery pieces, the surfaces of the plurality of battery pieces are provided with grid-shaped conductive adhesive tapes, and the grid-shaped conductive adhesive tapes are arranged on the surfaces of the plurality of battery pieces. The high-reflection layer comprises a first insulating layer, a second ultraviolet high-reflection layer, a third visible light high-reflection layer, a fourth infrared high-reflection layer and a fifth insulating layer which are sequentially stacked from top to bottom. According to the photovoltaic module, through structure optimization, anti-reflection of incident light, increase of absorption of reflected light and reduction of transmission resistance, the power generation efficiency of the photovoltaic module is obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic field especially relates to a high -efficient photovoltaic module. BACKGROUND

[0002] Solar cell is also called "photocell" or "solar chip", it is a kind of semiconductor flake to convert light energy into electric energy, solar cell piece is fragile, needs to be packaged to constitute photovoltaic module and can use.Photovoltaic module's power generation efficiency mainly depends on the light conversion efficiency of cell piece, the higher the light energy utilization rate on cell piece, the higher the power generation efficiency of photovoltaic module, and the current photovoltaic module's loss still has many problems to influence power generation efficiency, such as incident light loss, light absorption loss, electrical transmission loss, effective cell area shielding etc., therefore, it is necessary to design and improve photovoltaic module to further improve power generation efficiency. SUMMARY

[0003] In view of the above, the application provides a kind of high efficiency photovoltaic module, by the optimization of structure, increase the absorption of reflection light, reduce transmission resistance, to significantly improve the power generation efficiency of photovoltaic module.

[0004] The specific technical solutions are as follows: a kind of high efficiency photovoltaic module, from top to bottom sequentially includes double-coated glass, front film, cell layer, high reflection layer, rear film, rear plate, the cell layer includes several cell pieces, the surface of several cell pieces is equipped with grid conductive adhesive tape, the high reflection layer from top to bottom sequentially includes first insulating layer, second ultraviolet high reflection layer, third visible light high reflection layer, fourth infrared high reflection layer, fifth insulating layer.

[0005] As a further improved technical scheme of the utility model, the first insulating layer of the high reflection layer is attached to the cell layer, and the first insulating layer and the fifth insulating layer are the same, which is a yellow EVA layer.

[0006] As a further improved technical scheme of the utility model, the second ultraviolet high reflection layer is a blue EVA layer.

[0007] As a further improved technical scheme of the utility model, the third visible light high reflection layer is a red aluminum film layer.

[0008] As a further improved technical scheme of the utility model, the fourth infrared high reflection layer is a green PET film layer.

[0009] As a further improved technical scheme of the utility model, the double-coated glass includes a glass substrate, an anti-reflection layer and a refractive index matching layer disposed on the glass substrate, and the thickness ratio of the anti-reflection layer and the refractive index matching layer is 3:5.

[0010] As a further improved technical scheme of the present utility model, the high reflection layer is also arranged in the gap between adjacent battery pieces.

[0011] As a further improved technical scheme of the present utility model, the material of the antireflection layer and the refractive index matching layer is the same, which is silicon dioxide.

[0012] As a further improved technical scheme of the present utility model, the thickness ratio of the first insulating layer, the second ultraviolet high reflection layer, the third visible light high reflection layer, the fourth infrared high reflection layer and the fifth insulating layer is 1:1:3:2:1.

[0013] As a further improved technical scheme of the present utility model, the front film is a composite film, and the rear film is a transparent EVA layer.

[0014] The high-efficiency photovoltaic module of the present application improves the light transmission of incident light by arranging high-transparency double-coated film glass and a composite front film, reduces the loss of incident light, fully utilizes the incident light, arranges a five-layer high reflection layer on the back of the battery to reduce the optical path loss of the light source inside the module, increase the absorption of reflected light, improve the utilization of reflected light source, connect the back of the battery string into a whole by the superconducting grid tape, increase the current collection path, reduce the current transmission loss, effectively reduce the packaging loss of the module as a whole, and improve the efficiency of the module.

[0015] The additional aspects and advantages of the present utility model will be further given in the following description, some of which will become apparent from the following description or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 As shown is a photovoltaic module structure schematic view of the present utility model.

[0017] Figure 2 As shown is a high reflection layer structure schematic view of the present utility model

[0018] Figure 3 As shown is a double-coated film glass structure schematic view of the present utility model.

[0019] Figure 4 As shown is a battery layer structure schematic view of the present utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present utility model more clear, the present utility model is described in detail below in combination with the drawings and specific embodiments. In addition, it needs to be explained that, in order to facilitate description, only the parts related to the present utility model are shown in the drawings instead of all the structures.

[0021] REFERENCE Figure 1 and Figure 4The high-efficiency photovoltaic module of the embodiment comprises, from top to bottom, double-coated glass 1, front film 2, cell layer 3, high-reflection layer 4, back film 5, and back plate 6. Cell layer 3 comprises a plurality of cell pieces 31. The surface of the plurality of cell pieces 31 is provided with a grid-shaped conductive adhesive tape 32. The cell pieces 31 are connected in series or parallel to increase the current collection path and reduce the current transmission loss.

[0022] The front film 2 is a composite film with a refractive index of 1.91 or above, which reduces the refractive difference with the passivation layer and makes full use of the incident light. The composite film is formed by mixing and matching different refractive particles, or by grafting some functional groups to form a microcrystalline structure, such as sulfur-containing polymers (SCPs). The Korean Academy of Science and Technology has proposed a one-step gas-phase synthesis process called sulfur chemical vapor deposition (sCVD) to directly use elemental sulfur (as a high-molar refractive functional group) to generate high-stability, ultra-high-refractive (n>1.9) polymers (SCPs). Nano-composite optical thin films are obtained by introducing crystalline silicon nanoparticles into different sols and polymers, resulting in a series of composite optical films with high transparency, high refractive index, and high Abbe number. The film layer has a refractive index of 1.990, and the transmittance of the film layer in the visible light region is higher than 70%. Graphene-doped high-refractive composite optical thin films are prepared by chemically modifying single-layer graphene oxide and compounding it into different organic systems. The film layer has a refractive index of 1.936, and the transmittance of the film layer in the visible light region is more than 80%. In addition, the back film 5 is a transparent EVA layer.

[0023] Referring to Figure 2 The high-reflection layer 4 is not only attached to the cell layer 3 but also has a gap between adjacent cell pieces 31. The high-reflection layer 4 comprises, from top to bottom, a first insulating layer 41, a second ultraviolet high-reflection layer 42, a third visible light high-reflection layer 43, a fourth infrared high-reflection layer 44, and a fifth insulating layer 45. The first insulating layer 41 of the high-reflection layer 4 is attached to the cell layer. The first insulating layer 41 and the fifth insulating layer 45 have the same structure and material, which is a yellow EVA layer, to prevent the module from short-circuiting after the cell layer contacts the conductive material in the inner layer. The second ultraviolet high-reflection layer 42 is a blue EVA layer that reflects light with a wavelength below 380 nm and transmits visible light. The third visible light high-reflection layer 43 is a red aluminum film layer that reflects light with a wavelength of 380-780 nm. The fourth infrared high-reflection layer 44 is a green PET film layer that reflects light with a wavelength above 780 nm. Each layer is prepared by spraying with a spray gun, and the next layer is sprayed after high-temperature curing of the previous layer. The thickness ratio of the first insulating layer 41, the second ultraviolet high-reflection layer 42, the third visible light high-reflection layer 43, the fourth infrared high-reflection layer 44, and the fifth insulating layer 45 is 1:1:3:2:1. The arrangement of the high-reflection layer 4 further reduces the reflection path of the light source inside the module, reduces the reflection path loss, and improves the utilization of the reflected light source.

[0024] Referring to Figure 3 The double-coated glass 1 comprises a glass substrate 11, a refractive index matching layer 12 and an anti-reflection layer 13, the materials of the anti-reflection layer 3 and the refractive index matching layer 12 are the same, which is SiO2, the thickness ratio of the anti-reflection layer 13 and the refractive index matching layer 12 is 3:5, the anti-reflection layer 13 of the double-coated glass 1 is the first light receiving surface, the refractive index of the anti-reflection layer 13 is 1.46, the thickness is about 1 / 4 of the average wavelength of visible light, that is, 110-130nm, the use of the refractive index matching layer 12 can optimize the interference effect of light, realize wider anti-reflection bandwidth and lower reflectivity, when the anti-reflection layer 13 and the refractive index matching layer 12 form a double-layer anti-reflection film, good anti-reflection effect can be obtained.

[0025] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower" and the like appear, the orientation or position relationship is based on the orientation or position relationship shown in the drawings, in order to facilitate the description of the present application and simplify the description, when the orientation of the photovoltaic module changes, the "upper" and "lower" orientations may change, but the relative position relationship of the structure layers in the photovoltaic module will not change, for ordinary skilled persons in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] In addition, the above embodiments are only used to illustrate the present application and not to limit the technical solutions described in the present application, the understanding of the present application should be based on the skilled person in the art, although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the skilled person in the art can still modify or equivalently replace the present application, and all technical solutions and improvements which do not deviate from the spirit and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. A high efficiency photovoltaic module characterized by: From top to bottom, a double-coated glass, a front film, a battery layer, a high reflection layer, a back film and a back plate are sequentially stacked, the battery layer comprises a plurality of battery pieces, surfaces of the plurality of battery pieces are provided with a grid-shaped conductive adhesive tape, and the high reflection layer comprises, from top to bottom, a first insulating layer, a second ultraviolet high reflection layer, a third visible light high reflection layer, a fourth infrared high reflection layer and a fifth insulating layer.

2. The high efficiency photovoltaic module of claim 1, wherein, The first insulating layer of the high reflection layer is attached to the battery layer, and the first insulating layer is the same as the fifth insulating layer, which is a yellow EVA layer.

3. The high efficiency photovoltaic module of claim 1, wherein, The second ultraviolet high reflection layer is a blue EVA layer.

4. The high efficiency photovoltaic module of claim 1, wherein, The third visible light high reflection layer is a red aluminum film layer.

5. The high efficiency photovoltaic module of claim 1, wherein, The fourth infrared high reflection layer is a green PET film layer.

6. The high efficiency photovoltaic module of claim 1, wherein, The double-coated glass comprises a glass substrate, an anti-reflection layer and a refractive index matching layer arranged on the glass substrate, and the thickness ratio of the anti-reflection layer and the refractive index matching layer is 3:

5.

7. The high efficiency photovoltaic module of claim 1, wherein, The high reflection layer is also arranged in the gap between adjacent battery pieces.

8. The high efficiency photovoltaic module of claim 6, wherein, The materials of the anti-reflection layer and the refractive index matching layer are the same, which is silicon dioxide.

9. The high efficiency photovoltaic module of claim 1, wherein, The thickness ratio of the first insulating layer, the second ultraviolet high reflection layer, the third visible light high reflection layer, the fourth infrared high reflection layer and the fifth insulating layer is 1:1:3:2:

1.

10. The high efficiency photovoltaic module of claim 1, wherein, The front film is a composite film, and the back film is a transparent EVA layer.

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