Encapsulation backplane and solar cell assembly
By combining a reflective coating and a light-transmitting coating on the encapsulation backsheet, the problem of the encapsulation backsheet not being able to simultaneously meet aesthetic and light utilization requirements is solved, achieving efficient photoelectric conversion and light reuse of solar cell modules, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI HUASUN ENERGY CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-06-26
AI Technical Summary
Existing encapsulation backsheets cannot improve light utilization while meeting architectural aesthetic requirements, resulting in low power output of solar cell modules.
The encapsulation backplane design includes a base layer, a reflective coating, a first black transparent coating, and a second black transparent coating. The reflective coating is set in a corresponding manner with the spacer area, and the first and second black transparent coatings are located on both sides of the reflective coating, respectively. The high transmittance and low absorbance characteristics are used to improve light utilization.
While meeting architectural aesthetic requirements, the combination of reflective and translucent coatings improves the photoelectric conversion efficiency and light utilization of solar cell modules, and reduces the cost of the encapsulation backsheet.
Smart Images
Figure CN224419181U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of solar cell technology, specifically to an encapsulation backplane and a solar cell module. Background Technology
[0002] With the development of the times and the gradual improvement of people's living standards, the photovoltaic industry, in order to meet the aesthetic requirements of rooftop installations, has specially produced all-black solar cell modules. This means that the encapsulation frame, encapsulation film, busbars, and encapsulation backsheet of the solar cell module are all made of black materials. Existing encapsulation backsheets mostly use a black enamel coating, which absorbs most of the spectrum, resulting in very low reflectivity and thus reducing light utilization. Since solar cell modules convert light energy into electrical energy, existing solar cell modules have lower power output compared to conventional solar cell modules. Therefore, there is a need to provide an encapsulation backsheet and solar cell module that can improve light utilization while meeting architectural aesthetic requirements. Utility Model Content
[0003] Therefore, the technical problem to be solved by this utility model is to overcome the defect that the encapsulation backplate in the prior art cannot improve the utilization rate of light while satisfying the architectural aesthetic characteristics, thereby providing an encapsulation backplate and a solar cell module.
[0004] In a first aspect, the present invention provides an encapsulation backsheet, comprising a base layer, a reflective coating, a first black light-transmitting coating, and a second black light-transmitting coating. The base layer includes a plurality of spaced solar cell mounting areas and a spacing area between adjacent solar cells. The reflective coating is located on one side of the base layer and is disposed at least opposite to the spacing area. The first black light-transmitting coating is located on the surface of the reflective coating away from the base layer and is disposed at least opposite to the spacing area. The second black light-transmitting coating is located between the reflective coating and the base layer and is disposed at least opposite to the spacing area.
[0005] Both the first and second black translucent coatings are positioned opposite to at least the gap between adjacent solar cells, which helps to achieve a completely black effect on both sides of the encapsulation cover in the gap between adjacent solar cells, satisfying architectural aesthetic requirements. When light shines on the first black translucent coating, due to its high light transmittance, the light can pass through to the reflective coating. The reflective coating, with its lower absorption spectrum, can reflect most of the light that has passed through the first black translucent coating, thus achieving light reuse and improving the photoelectric conversion efficiency of the solar cell. Therefore, the encapsulation backplate provided by this invention satisfies architectural aesthetic requirements while also improving light utilization.
[0006] In some embodiments, both the reflective coating and the first black translucent coating are in a mesh pattern, and the orthographic projection of the first black translucent coating on the substrate coincides with the orthographic projection of the reflective coating on the substrate. This helps to reduce the cost of the encapsulation backplane.
[0007] In some embodiments, the orthographic projection of the second black translucent coating on the substrate coincides with the orthographic projection of the reflective coating on the substrate.
[0008] In some embodiments, the reflective coating comprises a white enamel layer.
[0009] In some embodiments, the first black translucent coating comprises a black fluoropolymer coating.
[0010] In some embodiments, the second black translucent coating comprises a black fluoropolymer coating.
[0011] In some embodiments, the thickness of the reflective coating is 2.5 to 3.5 times the thickness of the first black translucent coating.
[0012] In some embodiments, the thickness of the reflective coating is 14 μm-20 μm.
[0013] In some embodiments, the thickness of the first black translucent coating is 4μm-6μm.
[0014] In some embodiments, the thickness of the second black translucent coating is 4μm-6μm.
[0015] Secondly, this utility model provides a solar cell module, comprising: an encapsulation backplate provided in the first aspect; an encapsulation cover plate disposed opposite to the encapsulation backplate; and a solar cell array located between the encapsulation backplate and the encapsulation cover plate, wherein the solar cell array comprises a plurality of solar cells, and the solar cells are disposed opposite to the solar cell mounting area.
[0016] In some embodiments, both the reflective coating and the first black translucent coating are in a grid pattern, and the orthographic projection of the first black translucent coating on the substrate coincides with the orthographic projection of the reflective coating on the substrate; the solar cell is located in the grid of the first black translucent coating and the reflective coating.
[0017] In some embodiments, the solar cell module further includes: a first encapsulating adhesive layer located between the encapsulation cover and the solar cell array; and a second encapsulating adhesive layer located between the solar cell array and the encapsulation backplate.
[0018] In some embodiments, a plurality of solar cells are connected in series via interconnecting strips to form a solar cell string, and a plurality of solar cell strings are connected in parallel via busbars to form the solar cell array. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of the packaging backplate provided in Embodiment 1 of this utility model;
[0021] Figure 2 This is a schematic diagram of the structure of the packaging backplate provided in Embodiment 2 of this utility model;
[0022] Figure 3 This is a schematic diagram of the structure of the solar cell module provided in Embodiment 3 of this utility model.
[0023] Explanation of reference numerals in the attached figures:
[0024] 10-Base layer; 20, 21-Reflective coating; 30, 31-First black transparent coating; 40, 41-Second black transparent coating; 1-Encapsulation backplate; 2-Solar cell array; 3-Encapsulation cover plate; 4-First encapsulation adhesive layer; 5-Second encapsulation adhesive layer. Detailed Implementation
[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0026] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0027] Example 1
[0028] refer to Figure 1This embodiment provides an encapsulation backplane, including a base layer 10, a reflective coating 20, a first black translucent coating 30, and a second black translucent coating 40. The base layer 10 includes a plurality of spaced solar cell mounting areas and gaps between adjacent solar cells; the reflective coating 20 is located on one side of the base layer 10, and is disposed at least opposite to the gaps; the first black translucent coating 30 is located on the surface of the reflective coating 20 facing away from the base layer 10, and is disposed at least opposite to the gaps; the second black translucent coating 40 is located between the reflective coating 20 and the base layer 10, and is disposed at least opposite to the gaps.
[0029] Both the first black translucent coating 30 and the second black translucent coating 40 are positioned opposite to the gap between adjacent solar cells at least once, which helps to achieve a completely black effect on both sides of the encapsulation cover in the gap between adjacent solar cells, satisfying architectural aesthetic requirements. The reflective coating 20 is positioned opposite to the gap at least once. When light shines on the first black translucent coating 30, because the first black translucent coating 30 has high light transmittance, the light can pass through the first black translucent coating 30 to the reflective coating 20. The reflective coating 20, because it absorbs less of the spectrum, can reflect most of the light that has passed through the first black translucent coating 30, thereby achieving light reuse and improving the photoelectric conversion efficiency of the solar cell. Therefore, the encapsulation backplate provided by this utility model can improve the utilization rate of light while satisfying architectural aesthetic requirements.
[0030] Specifically, the base layer 10 includes, but is not limited to, transparent glass; the reflective coating 20 includes, but is not limited to, a white enamel layer; the first black translucent coating 30 includes, but is not limited to, a black fluoropolymer coating; and the second black translucent coating 40 includes a black fluoropolymer coating. Because the white enamel layer absorbs less light, it can reflect most of the light reaching it, thus achieving light reuse. The black fluoropolymer coating has high light transmittance, which is beneficial for light transmission. The white enamel layer can use white enamel commonly used in the art, and the black fluoropolymer coating can use black fluoropolymer coatings commonly used in the art. The coloring material of the black fluoropolymer coating includes perylene-based pigments.
[0031] In some embodiments, the thickness of the reflective coating 20 can be 2.5 to 3.5 times the thickness of the first black transparent coating 30, for example, 2.5 times, 2.6 times, 2.7 times, 2.8 times, 2.9 times, 3 times, 3.25 times, 3.5 times, or any range of the above values.
[0032] For example, the thickness of the reflective coating 20 can be 14μm-20μm, such as 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, or any range of the above values. By limiting the reflective coating to the above thickness range, the light utilization rate can be effectively improved while controlling the cost of the packaging backplane.
[0033] For example, the thickness of the first black translucent coating 30 can be 4μm-6μm, such as 4μm, 4.5μm, 5μm, 5.5μm, 6μm, or any range of the above values. By limiting the first black translucent coating to the above thickness range, a visually obvious all-black effect can be achieved, while improving the light transmittance of the first black translucent coating. In addition, it also helps to reduce the cost of the packaging backplane.
[0034] For example, the thickness of the second black translucent coating 40 can be 4μm-6μm, such as 4μm, 4.5μm, 5μm, 5.5μm, 6μm, or any range of the above values. By limiting the thickness of the second black translucent coating to the above-mentioned range, a visually distinct all-black effect can be achieved, while simultaneously improving the light transmittance of the second black translucent coating. Furthermore, it also helps to reduce the cost of the encapsulation backplane.
[0035] In some embodiments, the orthographic projection of the second black translucent coating 40 on the base layer 10 coincides with the orthographic projection of the reflective coating 20 on the base layer 10.
[0036] Example 2
[0037] refer to Figure 2 This embodiment provides a packaging backplate, which differs from the packaging backplate provided in Embodiment 1 only in that: the reflective coating 21, the first black translucent coating 31, and the second black translucent coating 41 are all in a mesh pattern. The orthographic projection of the first black translucent coating 31 on the substrate 10 coincides with the orthographic projection of the reflective coating 21 on the substrate, and the orthographic projection of the second black translucent coating 41 on the substrate 10 coincides with the orthographic projection of the reflective coating 21 on the substrate 10. The reflective coating 21, the first black translucent coating 31, and the second black translucent coating 41 are only arranged opposite to the spacing area, which helps to reduce the cost of the packaging backplate.
[0038] The method for preparing the encapsulation backplane provided in this embodiment includes the following steps:
[0039] A base layer 10 is provided, the base layer 10 including a plurality of spaced solar cell mounting areas and a spacing area between adjacent solar cells;
[0040] A second black translucent coating is formed on one side surface of the base layer 10. The second black translucent coating is at least disposed opposite to the interval area. The process of forming the second black translucent coating includes, but is not limited to, screen printing.
[0041] A reflective coating 11 is formed on the surface of the second black translucent coating away from the base layer 10. The reflective coating 11 is at least disposed opposite to the interval area. The process of forming the reflective coating 11 includes, but is not limited to, screen printing.
[0042] A first black translucent coating 12 is formed on the surface of the reflective coating 11 away from the base layer 10. The first black translucent coating 12 is disposed opposite to the interval area at least. The process of forming the first black translucent coating 12 includes, but is not limited to, screen printing.
[0043] In some embodiments, the method for preparing the encapsulation backplate may further include: before forming a second black translucent coating on one side surface of the base layer 10, performing edge grinding, chamfering, and cleaning treatment on the base layer in sequence, wherein the purpose of the cleaning treatment is to remove stains from the surface of the base layer.
[0044] In some embodiments, the method for preparing the encapsulation backplane further includes: tempering the encapsulation backplane, wherein the tempering treatment is beneficial for increasing the rigidity of the encapsulation backplane. The tempering treatment step may include: placing the encapsulation backplane in a tempering furnace for heat treatment, followed by cooling treatment.
[0045] Example 3
[0046] refer to Figure 3 This embodiment provides a solar cell module, including: an encapsulation backplate 1 provided in Embodiment 1 or Embodiment 2, an encapsulation cover plate 3 disposed opposite to the encapsulation backplate 1, and a solar cell array 2 located between the encapsulation backplate 1 and the encapsulation cover plate 3. The solar cell array 2 includes a plurality of solar cells, and the solar cells are disposed opposite to the solar cell mounting area. The solar cell module has all the advantages of the aforementioned encapsulation backplate, which will not be repeated here.
[0047] Both the first black translucent coating and the first black light-transmitting coating are arranged at least opposite to the interval area, which helps to achieve a completely black effect on both sides of the solar cell module in the interval area between adjacent solar cells, satisfying architectural aesthetics. The reflective coating is arranged at least opposite to the interval area. When light shining from the front of the solar cell module reaches the first black translucent coating, the light can pass through the first black translucent coating to the reflective coating because the first black translucent coating has a high light transmittance. The reflective coating has a lower absorption spectrum and can reflect most of the light that has passed through the first black translucent coating back to the solar cell, thereby achieving the reuse of light and improving the photoelectric conversion efficiency of the solar cell.
[0048] In some embodiments, both the reflective coating and the first black translucent coating are in a grid pattern, and the orthographic projection of the first black translucent coating on the substrate coincides with the orthographic projection of the reflective coating on the substrate; the solar cell is located in the grid of the first black translucent coating and the reflective coating.
[0049] In some embodiments, the solar cell module further includes: a first encapsulating adhesive layer 4 located between the encapsulation cover plate 3 and the solar cell array 2; and a second encapsulating adhesive layer 5 located between the solar cell array 2 and the encapsulation backplate 1.
[0050] In some embodiments, the solar cell array 2 includes a plurality of solar cell strings connected in parallel, and each solar cell string includes a plurality of solar cells connected in series. Specifically, a plurality of solar cells are connected in series via interconnecting strips to form a solar cell string, and a plurality of solar cell strings are connected in parallel via busbars to form the solar cell array. Solar cells include, but are not limited to, heterojunction cells.
[0051] In the description of this utility model, the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0052] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 based on the specific circumstances.
[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A packaging backplane, characterized in that, include: The base layer includes several spaced solar cell mounting areas and spacing areas between adjacent solar cells; A reflective coating located on one side of the base layer, the reflective coating being disposed at least opposite to the interval area; A first black translucent coating is located on the surface of the reflective coating on the side opposite to the base layer, and the first black translucent coating is disposed at least opposite to the interval area; A second black translucent coating is located between the reflective coating and the base layer, and the second black translucent coating is disposed at least opposite to the interval area.
2. The packaging backplane according to claim 1, characterized in that, Both the reflective coating and the first black translucent coating are in a grid pattern, and the orthographic projection of the first black translucent coating on the substrate coincides with the orthographic projection of the reflective coating on the substrate.
3. The packaging backplane according to claim 1 or 2, characterized in that, The orthographic projection of the second black translucent coating on the substrate coincides with the orthographic projection of the reflective coating on the substrate.
4. The packaging backplane according to claim 1, characterized in that, The reflective coating includes a white enamel layer; and / or, the first black translucent coating includes a black fluoropolymer coating. And / or, the second black translucent coating comprises a black fluoropolymer coating.
5. The packaging backplane according to claim 1 or 2, characterized in that, The thickness of the reflective coating is 2.5 to 3.5 times the thickness of the first black transparent coating.
6. The packaging backplane according to claim 5, characterized in that, The thickness of the reflective coating is 14μm-20μm; and / or, the thickness of the first black transparent coating is 4μm-6μm; and / or, the thickness of the second black transparent coating is 4μm-6μm.
7. A solar cell module, characterized in that, include: The packaging backplate as described in any one of claims 1 to 6; An encapsulation cover plate disposed opposite to the encapsulation backplate; as well as A solar cell array located between the encapsulation backplate and the encapsulation cover plate, the solar cell array comprising a plurality of solar cells, the solar cells being disposed opposite to the solar cell mounting area.
8. The solar cell module according to claim 7, characterized in that, Both the reflective coating and the first black translucent coating are in a grid pattern, and the orthographic projection of the first black translucent coating on the substrate coincides with the orthographic projection of the reflective coating on the substrate; the solar cell is located in the grid of the first black translucent coating and the reflective coating.
9. The solar cell module according to claim 7 or 8, characterized in that, The solar cell module also includes: The first encapsulating adhesive layer is located between the encapsulation cover and the solar cell array; A second encapsulating adhesive layer located between the solar cell array and the encapsulation backsheet.
10. The solar cell module according to claim 7, characterized in that, A number of solar cells are connected in series via interconnecting strips to form a solar cell string, and a number of solar cell strings are connected in parallel via busbars to form the solar cell array.