A package assembly for improving low irradiance power generation of a component

Abstract

This utility model discloses an encapsulation component for improving the power generation of a module under low irradiance, comprising, from top to bottom, an antireflective front glass, an antireflective film, a stacked crystalline silicon cell, a transparent film, and a grid-coated high-reflectivity back glass. The antireflective front glass includes high-transparency glass and a double-layer coating layer disposed on the upper surface of the high-transparency glass. The antireflective high-refractive-index film includes a cross-linked elastomer film layer disposed near the antireflective front glass and a high-refractive-index film layer disposed near the stacked crystalline silicon cell. This utility model features a double-coating design for the upper high-transparency glass, which improves light transmittance and incident rate, thereby increasing the incident energy of light reaching the solar cells and increasing module power. The middle anti-reflective high-refractive-index film layer, through a double-layer refractive index difference design, reduces the loss of light due to refraction and reflection caused by the refractive index difference, thereby increasing the incident light reaching the solar cells and increasing module power generation efficiency. The bottom layer of high-reflective grid-coated glass is a white grid-coated glass, which improves the secondary utilization rate of incident light. Matching the uppermost low-thickness anti-reflective glass, it can effectively ensure the overall mechanical load design of the module.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module packaging technology, and more specifically, to a packaging film for improving the power generation of a module under low irradiance and the module packaged therein. Background Technology

[0002] Solar energy is an inexhaustible and clean energy source. Photovoltaic modules work by directly converting solar energy into electrical energy. With continuous innovation in battery technology, various types of cells and their encapsulated modules have emerged, including TOPcon, PREC, HJT, perovskite, XBC, and cadmium telluride. However, due to differences in the unique EQE curves or passivation structures of different battery technologies, many high-efficiency cells, while showing high power output in module power tests, exhibit discrepancies between their actual power generation and the installed capacity during actual power plant operation. Furthermore, data analysis of actual power generation at power plants reveals that many types of high-efficiency modules generate particularly low amounts of power during periods of weak sunlight and high incident light angles, such as early morning and late evening.

[0003] Therefore, those skilled in the art urgently need to provide a method that can effectively increase the power generation of high-efficiency modules under low irradiance conditions in the morning and evening, thereby promoting higher power generation and revenue from the operation of high-efficiency modules at the power plant end. Utility Model Content

[0004] To address the aforementioned technical problems, this paper provides an encapsulating film for improving power generation under low irradiance conditions and the encapsulated module thereof. The design incorporates a double-layer coating on a high-transmittance front glass, while simultaneously reducing the total thickness of the front glass and increasing the thickness of the back glass. This design ensures high light transmittance while maintaining mechanical load capacity, reducing light loss due to reflection and refraction caused by differences in refractive indices between different materials at large incident angles. Furthermore, the layered crystalline silicon cells provide efficient EQE absorption of both long-wavelength and short-wavelength light, thus guaranteeing the high power generation efficiency of the module in actual power plants, especially under low irradiance conditions during the early morning and late evening.

[0005] To achieve the above objectives, this utility model discloses an encapsulation module for improving the power generation of a module under low irradiance, comprising, from top to bottom, an antireflective front glass, an antireflective film, a stacked crystalline silicon cell, a transparent film, and a grid-like high-reflectivity coated back glass. The antireflective front glass includes high-transparency glass and a double-layer coating layer disposed on the upper surface of the high-transparency glass. The antireflective high-refractive-index film includes a cross-linked elastomer film layer disposed near the antireflective front glass and a high-refractive-index film layer disposed near the stacked crystalline silicon cell.

[0006] Preferably, the double-layer coating includes a second coating layer disposed on the upper surface of the high-transparency glass, and a first coating layer disposed on the side of the second coating layer away from the high-transparency glass. The refractive index of the first coating layer is 1.10 to 1.18, and the thickness is 80 nm to 150 nm.

[0007] Preferably, the refractive index of the second coating layer is 1.19 to 1.29, and the thickness is 130 nm to 210 nm.

[0008] Preferably, the high-transmittance glass has a refractive index of 1.50 to 1.53 and a thickness of 800 μm to 2000 μm.

[0009] Preferably, the refractive index of the cross-linked elastomer film layer is 1.48 to 1.49 and the thickness is 280 μm to 400 μm, and the refractive index of the high-refractive film layer is 1.49 to 1.54 and the thickness is 20 μm to 100 μm.

[0010] Preferably, the tandem crystalline silicon solar cell is an N-type crystalline silicon tandem solar cell layer with a transparent conductive oxide superimposed perovskite deposit on its surface.

[0011] Preferably, the transparent film is a conventional high-transparency film with a thickness of 400μm to 600μm.

[0012] Preferably, the high-reflectivity glazed glass with a grid pattern is glazed glass with a grid pattern white glaze, the thickness of which is 2200μm to 3200μm, and the reflectivity of the grid pattern white glaze layer is >88.5% at 380nm to 1100nm.

[0013] The beneficial effects of this utility model compared with the prior art are as follows:

[0014] (1) The upper high-transparency glass adopts a double coating layer design to reduce the loss of light due to refraction and reflection caused by the difference in refractive index. At the same time, the upper high-transparency glass adopts an overall low thickness design, which improves the light transmittance and incident rate, thereby increasing the incident energy of light reaching the solar cell and increasing the module power.

[0015] (2) The intermediate antireflective high refractive index film layer is designed with a double refractive index difference. The cross-linked thin film layer with a refractive index of 1.480-1.489 is used near the glass surface, while the high refractive index film layer with a refractive index of 1.49-1.54 is used near the cell surface. This reduces the loss of light due to refraction and reflection caused by the refractive index difference, thereby increasing the incident light reaching the cell and increasing the power generation efficiency of the module. The effect is more obvious when the incident angle of light is large.

[0016] (3) The bottom layer of high-reflectivity glazed glass is glazed glass with grid white glaze (the reflectivity of the glaze layer at 380-1100nm is >88.5%), which improves the secondary utilization rate of incident light. The thickness is designed to be 2200-3200μm, which can effectively ensure the overall mechanical load design of the component when matched with the top layer of low-thickness anti-reflective glass. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the figure: 10 is the antireflective glass before coating; 101 is the first coating layer; 102 is the second coating layer; 103 is the high-transparency glass; 20 is the antireflective film; 201 is the cross-linked elastomer film layer; 202 is the high-refractive-index film layer; 30 is the stacked crystalline silicon solar cell; 40 is the transparent film; 50 is the grid-reflective glass after coating. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] One embodiment of this utility model is as follows: Figure 1 As shown, the structure includes, from top to bottom, an antireflective front glass 10, an antireflective film 20, a stacked crystalline silicon solar cell 30, a transparent film 40, and a grid-type high-reflectivity coated rear glass 50. The antireflective front glass 10 includes a high-transparency glass 103 and a double-layer coating layer disposed on the upper surface of the high-transparency glass 103. The double-layer coating layer includes a second coating layer 102 disposed on the upper surface of the high-transparency glass 103. A first coating layer 101 is disposed on the side of the second coating layer 102 away from the high-transparency glass 103. The antireflective high-refractive-index film 20 includes a cross-linked elastomer film layer 2 disposed close to the antireflective front glass 10. The high-refractive-index encapsulant layer 202, located near the tandem silicon cell 30, is a double-layer coating on the high-transmittance front glass design. The design of reducing the total thickness of the front glass and increasing the thickness of the back glass ensures high light transmittance of the module while also ensuring the mechanical load of the module. It reduces the loss of light due to reflection and refraction caused by the difference in refractive index between different materials when light is incident at a large angle. At the same time, the tandem silicon cell has efficient EQE absorption of both long-wavelength and short-wavelength light, thereby ensuring the power generation efficiency of the high-efficiency module in actual power plants, especially in low irradiance conditions during the morning and evening.

[0022] In this embodiment, the refractive index of the first coating layer 101 is 1.10–1.18, and the thickness is 80 nm–150 nm. Specifically, the refractive index of the first coating layer can be 1.10, 1.13, 1.15, or 1.18, and the thickness can be 80 nm, 90 nm, 100 nm, 120 nm, 140 nm, or 150 nm, or other suitable dimensions. The refractive index of the second coating layer 102 is 1.19–1.29, and the thickness is 130 nm–210 nm. Specifically, the refractive index of the second coating layer can be 1.19, 1.22, 1.24, 1.26, or 1.29, and the thickness can be 130 nm, 150 nm, 160 nm, 180 nm, or 200 nm. The dimensions can be 1.50μm, 210nm, or other suitable sizes. The high-transmittance glass 103 has a refractive index of 1.50 to 1.53 and a thickness of 800μm to 2000μm. Specifically, the refractive index of the high-transmittance glass can be 1.50, 1.51, 1.52, or 1.54, and the thickness can be 800μm, 900μm, 1000μm, 1100μm, or 1200μm, or other suitable sizes. The upper high-transmittance glass adopts a double-coating layer design to reduce the loss of light due to refraction and reflection caused by the difference in refractive index. At the same time, the upper high-transmittance glass adopts an overall low-thickness design, which improves the light transmittance and incident rate, thereby increasing the incident energy of light reaching the solar cells and increasing the module power.

[0023] In this embodiment, the refractive index of the cross-linked elastomer film layer 201 is 1.48–1.49, and the thickness is 280 μm–400 μm. Specifically, the refractive index of the cross-linked elastomer film layer can be 1.480, 1.482, 1.486, or 1.488, and the thickness can be 280 μm, 320 μm, 360 μm, 380 μm, or 400 μm, or other suitable dimensions. The refractive index of the high-refractive-index film layer 202 is 1.49–1.54, and the thickness is 20 μm–100 μm. Specifically, the refractive index of the high-refractive-index film layer can be 1.48. 9, 1.50, 1.51, 1.52, 1.54, with thicknesses of 20μm, 40μm, 60μm, 80μm, 100μm, or other suitable sizes. The intermediate antireflective high-refractive-index film layer uses a double-layer refractive index difference design, employing a cross-linked thin film layer near the glass surface and a high-refractive-index film layer near the cell surface. This reduces light loss due to refraction and reflection caused by the refractive index difference, thereby increasing the incident light reaching the cell and increasing the module's power generation efficiency, especially when the light incident angle is large.

[0024] The tandem crystalline silicon solar cell 30 is an N-type crystalline silicon tandem solar cell layer with a transparent conductive oxide superimposed perovskite deposition on its surface.

[0025] Transparent film 40 is a conventional high-transparency film with a thickness of 400μm to 600μm.

[0026] The high-reflectivity glazed glass 50 is a glazed glass with a grid-like white glaze, with a thickness of 2200μm to 3200μm. The specific thickness can be 2200μm, 2400μm, 2600μm, 2800μm, or 3200μm, or other suitable sizes. The glaze layer of the grid-like white glaze has a reflectivity of >88.5% in the 380nm to 1100nm range, which improves the secondary utilization rate of incident light. When matched with the top layer of low-thickness anti-reflective glass, it can effectively ensure the design of the overall mechanical load of the component.

[0027] Several points need to be clarified: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships, and the relative positional relationships may change when the absolute position of the described objects changes. Second, in this document, relational terms such as "first" and "second" are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities.

[0028] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. An encapsulated module for improving power generation under low irradiance, characterized in that, The device includes, from top to bottom, an antireflective front glass (10), an antireflective film (20), a stacked crystalline silicon cell (30), a transparent film (40), and a grid-coated high-reflectivity glazed back glass (50). The antireflective front glass (10) includes a high-transparency glass (103) and a double-layer coating layer disposed on the upper surface of the high-transparency glass (103). The antireflective high-refractive-index film (20) includes a cross-linked elastomer film layer (201) disposed near the antireflective front glass (10) and a high-refractive-index film layer (202) disposed near the stacked crystalline silicon cell (30).

2. The encapsulation module for improving low-irradiance power generation of a module according to claim 1, characterized in that, The double-layer coating includes a second coating layer (102) disposed on the upper surface of the high-transparency glass (103). A first coating layer (101) is disposed on the side of the second coating layer (102) away from the high-transparency glass (103). The refractive index of the first coating layer (101) is 1.10 to 1.18 and the thickness is 80 nm to 150 nm. The refractive index of the second coating layer (102) is 1.19 to 1.29 and the thickness is 130 nm to 210 nm. The refractive index of the high-transparency glass (103) is 1.50 to 1.53 and the thickness is 800 μm to 2000 μm.

3. A packaging module for improving low-irradiance power generation according to claim 1, characterized in that, The cross-linked elastomer film layer (201) has a refractive index of 1.48 to 1.49 and a thickness of 280 μm to 400 μm, while the high refractive index film layer (202) has a refractive index of 1.49 to 1.54 and a thickness of 20 μm to 100 μm.

4. A packaging module for improving low-irradiance power generation according to claim 1, characterized in that, The stacked crystalline silicon solar cell (30) is an N-type crystalline silicon stacked solar cell layer with a transparent conductive oxide superimposed perovskite deposition on its surface.

5. A packaging module for improving low-irradiance power generation according to claim 1, characterized in that, The transparent film (40) is a conventional high-transparency film with a thickness of 400μm to 600μm.

6. A packaged module for improving low-irradiance power generation according to claim 1, characterized in that, The high-reflectivity glazed glass (50) with grid is a glazed glass with grid white glaze, with a thickness of 2200μm to 3200μm and a reflectivity of >88.5% for the glaze layer of grid white glaze at 380nm to 1100nm.

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