Colored battery assembly and photovoltaic system

Abstract

This application relates to the field of solar cell technology, providing a colored solar cell module and a photovoltaic system. The colored solar cell module includes a front panel, a front encapsulating film, a cell array, a rear encapsulating film, and a back panel stacked sequentially. The reflectivity of the light-receiving surface of the colored back-contact solar cell array is 5%-45%. Thus, by setting the reflectivity of the light-receiving surface of the colored back-contact solar cell within the reasonable range of 5%-45%, the brightness of the colored back-contact solar cell can be effectively improved. This ensures that after the colored back-contact solar cell array is formed and encapsulated into a colored solar cell module, the colored solar cell module also possesses bright and vibrant colors. This avoids a significant reduction in brightness after encapsulation and lamination, resulting in dull and indistinct colors. Furthermore, it eliminates the need for colored glass, colored encapsulating films, or colored inks to achieve the colorization of the solar cell module, reducing parasitic absorption and ensuring module efficiency.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, and more particularly to a colored cell module and photovoltaic system. Background Technology

[0002] Currently, the industry uses colored solar cell modules to achieve color through structures such as colored glass, colored encapsulating films, or colored inks. The cells in these colored solar cell modules typically use conventional cells. The above solutions have significant parasitic absorption of light, which greatly affects the module efficiency. There are also solutions in the industry that use colored cells to achieve color in solar cell modules. These colored cells are texturized on a silicon substrate and then high / low refractive index films are stacked on the front side to make the cells appear in different colors. However, after such cells are laminated and encapsulated into modules, the brightness is greatly reduced, the cells are not bright enough, and the colors become dim or even indistinct. Summary of the Invention

[0003] This application provides a colored battery module and a photovoltaic system, aiming to solve the technical problem of how to make the encapsulated module have bright and vivid colors and ensure conversion efficiency during the manufacturing of colored battery modules.

[0004] This application is implemented as follows: the colored back-contact solar cell provided by this application includes a front plate, a front encapsulating film, a cell array, a rear encapsulating film and a back plate stacked in sequence. The cell array includes a plurality of colored back-contact solar cells. The reflectivity of the light-receiving surface of the colored back-contact solar cell is 5%-45%. The front encapsulating film covers the light-receiving surface of the back-contact solar cell.

[0005] Furthermore, the reflectivity of the light-receiving surface of the colored back-contact solar cell is 10%-40%.

[0006] Furthermore, the reflectivity of the light-receiving surface of the colored battery assembly is 2%-40%.

[0007] Furthermore, the reflectivity of the light-receiving surface of the colored battery assembly is 20%-35%.

[0008] Furthermore, the colored back-contact solar cell includes a brightness-enhancing silicon wafer and a color-adjusting film layer disposed on the light-receiving surface of the brightness-enhancing silicon wafer, wherein the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer is 15%-45%.

[0009] Furthermore, the thickness of the color-adjusting film is 20nm-560nm, and the refractive index of the color-adjusting film is 1.4-3.5.

[0010] Furthermore, the color adjustment film layer includes a first film layer and a second film layer. The first film layer is stacked on the light-receiving surface of the brightness-enhancing silicon wafer, and the second film layer is stacked on the side of the first film layer that is away from the light-receiving surface of the brightness-enhancing silicon wafer. The refractive index of the first film layer is less than the refractive index of the second film layer.

[0011] Furthermore, the color adjustment film layer also includes a third film layer, which is stacked between the first film layer and the brightness enhancement silicon wafer.

[0012] Furthermore, the refractive index of the third film layer is greater than that of the first film layer.

[0013] Furthermore, the battery array includes colored solder ribbons connecting the colored back-contact solar cells; or

[0014] The battery array includes colored busbars connecting the colored back-contact solar cells; or

[0015] The battery array includes colored solder strips connecting the colored back-contact solar cells and colored busbars connecting the colored solder strips.

[0016] Furthermore, the color of the colored solder ribbon is the same as the color of the colored back-contact solar cell.

[0017] Furthermore, the color of the colored busbar is the same as the color of the colored back-contact solar cell.

[0018] Furthermore, a colored shielding layer is provided between two adjacent colored back-contact solar cells.

[0019] Furthermore, the color of the colored shielding layer is the same as the color of the colored back-contact solar cell.

[0020] Furthermore, the battery array includes at least two different colors of the back-contact solar cells.

[0021] Furthermore, the backsheet is a colored backsheet, and the color of the colored backsheet is the same as the color of the colored back-contact solar cell.

[0022] This application also provides a photovoltaic system, which includes the color battery module described in any of the above claims.

[0023] In the colored battery module and photovoltaic system of this application embodiment, by setting the reflectivity of the light-receiving surface of the colored back-contact solar cell to a reasonable range of 5%-45%, the brightness of the colored back-contact solar cell can be effectively improved. This ensures that after the colored back-contact solar cell is formed into a battery array and encapsulated and laminated into a colored battery module, the colored battery module also has a bright and vivid color. This avoids the significant reduction in brightness of the colored solar cell module after encapsulation and lamination, resulting in a dull and indistinct color. At the same time, it eliminates the need to use colored glass, colored encapsulation film, or colored ink to achieve the colorization of the battery module, reducing parasitic absorption and ensuring the efficiency of the module.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the photovoltaic system provided in this application;

[0026] Figure 2 This is a schematic diagram of the structure of the color battery assembly provided in this application;

[0027] Figure 3 This is a schematic diagram of the structure of the colored back-contact solar cell provided in this application;

[0028] Figure 4 This is another structural schematic diagram of the colored back-contact solar cell provided in this application;

[0029] Figure 5 This is another structural schematic diagram of the colored back-contact solar cell provided in this application;

[0030] Figure 6 This is another structural schematic diagram of the colored back-contact solar cell provided in this application. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0032] In the description of this application, it should be understood that the terms "upper", "lower", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0033] 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 the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0036] In this application, by setting the reflectivity of the light-receiving surface of the colored back-contact solar cell to a reasonable range of 5%-45%, the brightness of the colored back-contact solar cell can be effectively improved. This ensures that after the colored back-contact solar cell is formed into a cell array and encapsulated and laminated into a colored cell module, the colored cell module also has a bright and vivid color. This avoids the situation where the brightness of the colored solar cell module is greatly reduced after encapsulation and lamination, resulting in a dull and indistinct color. At the same time, it eliminates the need to use colored glass, colored encapsulation film, or colored ink to achieve the colorization of the cell module, reducing parasitic absorption and ensuring the efficiency of the module.

[0037] Example 1

[0038] Please see Figures 1-2 The photovoltaic system 1000 in this application embodiment may include the color battery module 100 in this application embodiment. The color battery module 100 in this application embodiment may include a front panel 10, a front encapsulant film 20, a battery array 30, a rear encapsulant film 40 and a back panel 50 stacked in sequence. The battery array 30 includes a plurality of color back contact solar cells 31. The reflectivity of the light-receiving surface of the color back contact solar cells 31 is 5%-45%. The front encapsulant film 20 covers the light-receiving surface of the color back contact solar cells 31.

[0039] In the colored battery module 100 and photovoltaic system 1000 of this application embodiment, by setting the reflectivity of the light-receiving surface of the colored back-contact solar cell 31 to a reasonable range of 5%-45%, the brightness of the colored back-contact solar cell 31 can be effectively improved. This ensures that after the colored back-contact solar cell 31 forms the battery array 30 and is encapsulated and laminated into the colored battery module 100, the colored battery module 100 also has a bright and vivid color. This avoids the situation where the brightness of the colored solar cell module 200 is greatly reduced after encapsulation and lamination, resulting in a dull and indistinct color. At the same time, it eliminates the need to use colored glass, colored encapsulation film, or colored ink to achieve the colorization of the battery module, reducing parasitic absorption and ensuring the efficiency of the module.

[0040] It should be noted that in this application, the colored back contact solar cell 31 refers to a colored back contact solar cell, and the colored refers to a color other than black and white.

[0041] In this application, the brightness of the colored back contact solar cell 31 is adapted to the reflectivity of the light-receiving surface of the colored back contact solar cell 31, which is 5%-45%. That is, different reflectivities of the light-receiving surface of the colored back contact solar cell 31 correspond to different brightness of the colored back contact solar cell 31.

[0042] It should also be noted that "the reflectivity of the light-receiving surface of the colored back contact solar cell 31" refers to the overall reflectivity of the front of the cell in the air after the entire colored back contact solar cell 31 has been manufactured, and not the reflectivity of the topmost surface of the colored back contact solar cell 31.

[0043] Furthermore, in the embodiments of this application, "reflectivity of the light-receiving surface of the colored back-contact solar cell 31" can be understood as the average reflectivity or weighted average reflectivity of the light-receiving surface of the colored back-contact solar cell 31 in the visible light band. In the following text, if the same or similar descriptions (e.g., the reflectivity of a certain element) appear, they can also be understood with reference to this text.

[0044] The average reflectance can be understood as the average reflectance of light of various wavelengths within the visible light band (380nm-780nm) on the light-receiving surface of the colored back-contact solar cell 31.

[0045] The weighted average reflectance can be determined by the following formula:

[0046]

[0047] Where WAR represents the weighted average reflectance; λ represents the wavelength; φ(λ) represents the luminous flux at the corresponding wavelength; and R(λ) represents the reflectance at the corresponding wavelength.

[0048] Specifically, in some embodiments, the reflectivity of the light-receiving surface of the colored back-contact solar cell 31 can be measured by instruments such as a D8 reflectometer, an ultraviolet-visible-near-infrared spectrophotometer, and an ellipsometer. The various reflectivities mentioned below can also be measured together by these instruments.

[0049] In the embodiments of this application, the colored back-contact solar cell 31 may be a half cell or a full cell, and no specific limitation is made here.

[0050] In this application, multiple colored back-contact solar cells 31 in the colored battery module 100 can be connected in series to form a battery string. Each battery string can be connected in series, in parallel, or in a series-parallel combination to form a battery array and realize current collection and output. For example, the connection of each battery string can be achieved by setting solder strips, busbars, interconnecting strips, etc.

[0051] It is understood that in the embodiments of this application, the front adhesive film 20 can be filled between the front side of the battery array 30 and the front plate 10, and the rear adhesive film 40 can be filled between the back side of the battery array 30 and the back plate 50, etc. As fillers, both can be transparent colloids with good light transmittance and aging resistance. For example, the adhesive film can be a transparent EVA adhesive film or a transparent POE adhesive film. The specific choice can be made according to the actual situation and is not limited here.

[0052] The front panel 10 can be photovoltaic glass, which can cover the front encapsulant film 20. The photovoltaic glass can be ultra-clear glass, which has high light transmittance, high transparency, and superior physical, mechanical and optical properties. For example, the light transmittance of ultra-clear glass can reach more than 92%, which can protect the colored back contact solar cell 31 without affecting the efficiency of the colored back contact solar cell 31 as much as possible.

[0053] The backsheet 50 can also be photovoltaic glass, tempered glass, plexiglass, aluminum alloy TPT composite film, etc., and its specific configuration can be determined according to the specific circumstances. There are no restrictions here. The front film 20 can bond the photovoltaic glass and the cell array 30 together, and the rear film 40 can bond the cell array 30 and the backsheet 50 together, thereby forming the overall colored cell module 100.

[0054] Furthermore, in this embodiment, the photovoltaic system 1000 can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy for power generation, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system 1000 are not limited to these; that is, the photovoltaic system 1000 can be applied in all fields that require solar energy for power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic system 1000 may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple colored battery modules 100. For example, multiple colored battery modules 100 can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0055] In this application, the brightness of the colored back-contact solar cell 31 can be 0.1-0.8. Thus, by keeping the reflectivity of the light-receiving surface of the colored back-contact solar cell 31 within a reasonable range of 5%-45%, the brightness of the colored solar cell 100 can be kept within this reasonable range of 0.1-0.8, thereby effectively improving the brightness of the colored back-contact solar cell 31. This ensures that after the colored back-contact solar cell 31 is encapsulated and laminated to form the colored cell module 100, the module will also have bright and vibrant colors, while avoiding excessive brightness that could lead to lower conversion efficiency.

[0056] It should be noted that in this application, "brightness" refers to the L value in the HSL color space. Specifically, the brightness in this document is the normalized brightness value calculated and measured under a D50 light source with a 2° viewing angle, defined in the HSL color space.

[0057] Furthermore, in some embodiments, the reflectivity of the light-receiving surface of the colored back-contact solar cell 31 is preferably 10%-40%.

[0058] In this way, setting the overall reflectivity of the colored back-contact solar cell 31 within this optimal range allows the colored back-contact solar cell 31 to also have a bright and vivid color after being encapsulated and laminated to form the colored battery module 100.

[0059] Specifically, in such an embodiment, the reflectivity of the light-receiving surface of the colored back-contact solar cell 31 can be any value among 10%, 15%, 20%, 25%, 30%, 35%, 40%, or 10%-40%, without any specific limitation.

[0060] In this embodiment, the brightness of the colored back-contact solar cell 31 is 0.2-0.8. Thus, by keeping the reflectivity of the light-receiving surface of the colored back-contact solar cell 31 within the optimal range of 10%-40%, the brightness of the colored solar cell 100 can be kept within the optimal range of 0.2-0.8. This ensures that the colored back-contact solar cell 31 retains a bright and vibrant color after being encapsulated and laminated into the colored cell module 100, while also preventing excessive brightness from causing a decrease in conversion efficiency.

[0061] In some embodiments, the reflectivity of the light-receiving surface of the color battery assembly 100 may be 2%-40%.

[0062] In this way, the reflectivity of the entire colored back-contact solar cell 31 is within this reasonable range, which can effectively ensure that the brightness of the entire colored cell module 100 is within a reasonable range, avoiding the problem that the color is dim and not obvious due to the low brightness of the colored cell module 100, and also avoiding the problem that the conversion efficiency is low due to the high brightness.

[0063] It should be noted that "the reflectivity of the light-receiving surface of the colored solar cell module 100" refers to the reflectivity of the entire module after the entire colored solar cell module 100 is manufactured, and not the reflectivity of the topmost surface of the colored solar cell module 100. For example, it can be understood as the reflectivity of the module formed after multiple colored back-contact solar cells 31 are laminated and encapsulated through a front encapsulating film 20, a front panel 10, a rear encapsulating film 40, and a back panel 50. Its reflectivity is determined by the reflectivity of the light-receiving surface of the colored back-contact solar cells 31, the reflectivity of the front encapsulating film 20, and the reflectivity of the front panel 10. For the specific meaning and measurement method of reflectivity, please refer to the definition and measurement method of the reflectivity of the light-receiving surface of the colored back-contact solar cells 31 mentioned above, which will not be repeated here.

[0064] In such an embodiment, the brightness of the color battery module 100 can be 0.1-0.6. Thus, by keeping the reflectivity of the light-receiving surface of the color battery module 100 within a reasonable range of 2%-40%, the brightness of the color battery module 100 can be kept within a reasonable range of 0.1-0.6, ensuring that the module has bright and vivid colors.

[0065] Preferably, in some embodiments, the reflectivity of the light-receiving surface of the color battery assembly 100 is preferably 20%-35%.

[0066] In such a case, preferably, the brightness of the color battery assembly 100 is 0.15-0.6.

[0067] Thus, by setting the reflectivity of the light-receiving surface of the color battery module 100 within this optimal range, the brightness of the color battery module 100 can be guaranteed to be within the optimal range of 0.15-0.6, ensuring that the module has bright and vivid colors, while also avoiding excessive brightness that would lead to a decrease in conversion efficiency.

[0068] Specifically, in such an embodiment, the reflectivity of the color battery module 100 can be any value among 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 35%, or 20%-35%, without any specific limitation. The brightness of the color battery module 100 can be any value between 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.55, 0.6, or 0.15-0.6, without any specific limitation, as different reflectivities correspond to different brightness levels.

[0069] Example 2

[0070] Please see Figure 3 In some embodiments, the colored back-contact solar cell 31 includes a brightness-enhancing silicon wafer 311 and a color-adjusting film layer 312 disposed on the light-receiving surface of the brightness-enhancing silicon wafer 311, wherein the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 is 15%-45%.

[0071] The light-receiving surface of the brightness-enhancing silicon wafer 311 refers to the upper surface of the brightness-enhancing silicon wafer 311. The color of the colored back contact solar cell 31 is matched with the thickness and refractive index of the color adjustment film layer 312. That is, the color of the colored back contact solar cell 31 can be determined by the thickness and refractive index of the color adjustment film layer 312. Different thickness ranges and refractive index ranges correspond to different colors and different brightness.

[0072] In this application, the reflectivity and brightness of the light-receiving surface of the colored back contact solar cell 31 are adapted to the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311. That is to say, with the same color adjustment film 20, different reflectivities of the light-receiving surface of the brightness-enhancing silicon wafer 311 correspond to different reflectivities and brightness of the colored back contact solar cell 31.

[0073] Thus, when manufacturing the colored back-contact solar cell 31, the thickness and refractive index of the color adjustment film layer 312 can be reasonably adjusted during the manufacturing process to achieve the colorization of the colored back-contact solar cell 31 and the colored battery module 100, without the need to use ink glass, colored glass, or colored encapsulating film during lamination and encapsulation to achieve the colorization of the colored battery module 100. This avoids the instability of the module caused by the influence of the environment on the printed ink, improves the stability and reliability of the module, reduces costs, and also avoids the high parasitic absorption caused by the use of printing ink, colored glass, or colored encapsulating film, which leads to low conversion efficiency, thereby improving the conversion efficiency of the colored battery module 100.

[0074] Meanwhile, by setting the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 within a reasonable range of 15%-45%, the reflectivity of the colored back-contact solar cell 31 can be ensured to be within a reasonable range of 5%-45%, effectively improving the brightness of the colored back-contact solar cell 31. This ensures that the colored back-contact solar cell 31 also has a bright and vivid color after being encapsulated and laminated into a module, avoiding a significant reduction in the brightness of the colored solar cell module 200 after encapsulation and lamination, which would result in a dull and indistinct color.

[0075] It should be noted that the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 refers to the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 in air when the color adjustment film layer 312 is not applied. In contrast, the "reflectivity of the light-receiving surface of the colored back-contact solar cell 31" refers to the overall reflectivity of the front side of the cell after the entire colored back-contact solar cell 31 has been fabricated. For example, it can be understood as the reflectivity after the color adjustment film layer 312 has been applied to the light-receiving surface of the brightness-enhancing silicon wafer 311, and its reflectivity is determined by both the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 and the reflectivity of the color adjustment film layer 312.

[0076] Furthermore, it should be noted that in the embodiments of this application, the color adjustment film layer 312 has a passivation function. That is to say, the color adjustment film layer 312 can change the color of the colored back contact solar cell 31 while also having a passivation function, thereby improving the conversion efficiency of the colored back contact solar cell 31.

[0077] Specifically, in this application, in order to achieve a high reflectivity and clean light-receiving surface of the brightness-enhancing silicon wafer 311, the brightness-enhancing silicon wafer 311 can be chemically treated, such as by damage removal, acid polishing or alkaline polishing, chemical mechanical polishing, or electrochemical polishing. Alternatively, texturing can be performed first, followed by the above treatments.

[0078] For example, in some embodiments, the light-receiving surface of the brightness-enhancing silicon wafer 311 is a planarized surface, which can be polished by acidic solutions such as hydrofluoric acid and nitric acid to make the light-receiving surface of the brightness-enhancing silicon wafer 311 planarized. Alternatively, in some embodiments, the light-receiving surface of the brightness-enhancing silicon wafer 311 can be polished by alkaline solutions such as potassium hydroxide and sodium hydroxide to make the light-receiving surface of the brightness-enhancing silicon wafer 311 planarized. The specific process for achieving planarization is not limited here.

[0079] In the embodiments of this application, the brightness of the colored back-contact solar cell 31 is positively correlated with the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311. Thus, the overall reflectivity of the colored back-contact solar cell 31 can be adjusted by regulating the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 during manufacturing, thereby ensuring its brightness reaches a suitable range and preventing a significant reduction in brightness after encapsulation and lamination, which would result in a dull and indistinct color. This allows the encapsulated and laminated colored cell module 100 to have a bright and vibrant color.

[0080] In the embodiments of this application, the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 is preferably 20%-40%.

[0081] Thus, by setting the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 within the aforementioned preferred range, the reflectivity of the colored back-contact solar cell 31 can be in a better range, thereby keeping its brightness in a better range and achieving the optimal color effect, thus minimizing the possibility that the colored cell module 100 will not be bright and vivid enough after encapsulation and lamination.

[0082] Specifically, in such an embodiment, the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 can be any value among 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, or 20%-40%.

[0083] In traditional technologies, the reflectivity of the light-receiving surface of brightness-enhancing silicon wafers (311) is typically 4%-15%. Since they are usually not planarized, their low reflectivity results in a significant reduction in brightness after lamination to form a module, leading to dull and indistinct colors, or even color loss. To achieve color in the laminated module, traditional solutions typically employ the following techniques:

[0084] 1. When encapsulating into components, glass with printed ink is used for encapsulation;

[0085] 2. When encapsulating into components, colored glass is used for encapsulation;

[0086] 3. When encapsulating into components, use colored encapsulating film for encapsulation.

[0087] However, using traditional technical solution 1 results in significant light absorption across the entire module, and the ink can lead to module instability, low reliability, and low conversion efficiency after prolonged use. Traditional technical solutions 2 and 3 also result in significant light absorption and low conversion efficiency across the entire module.

[0088] Regarding the aforementioned traditional solutions for colorizing solar cells, the inventors of this application discovered during their research that, in order to achieve colorization of the solar cells, the thickness and refractive index of the color adjustment film layer 312 in this application can be adjusted during the manufacturing process to achieve colorization of both the solar cells and the module. This eliminates the need for printing inks, colored glass, and colored encapsulating films, reducing parasitic absorption of light and improving conversion efficiency. Furthermore, the inventors found that by processing the light-receiving surface of the brightness-enhancing silicon wafer 311 (e.g., planarization) and setting the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer 311 within a reasonable range of 15%-45%, the reflectivity of the colored back-contact solar cell 31 is ensured to be within a reasonable range of 5%-45%, thereby increasing the brightness of the colored back-contact solar cell 31. During the subsequent lamination of the colored back-contact solar cell 31 to form the colored solar cell module 100, the color and brightness of the colored solar cell module 100 do not change significantly, ensuring that the colored solar cell module 100 also possesses bright and vibrant colors.

[0089] In other words, the technical solution of this application eliminates the need for ink, colored glass, and colored encapsulating film, resulting in less light absorption, higher reliability, and effective guarantee of conversion efficiency. It also enhances the brightness of the colored back-contact solar cell 31, giving it a bright and vibrant color. Even after being encapsulated into a colored battery module 100, the colored battery module 100 retains its bright and vibrant color. Therefore, compared to traditional colorization technologies 1-3, this application can improve conversion efficiency while also giving the colored battery module 100 higher brightness and a bright and vibrant color, and it also improves the reliability of the colored battery module 100.

[0090] Furthermore, in the embodiments of this application, the color-adjusting film layer 312 may be one or more of the following: aluminum oxide film layer, silicon oxide film layer, silicon nitride film layer, silicon oxynitride film layer, titanium dioxide film layer, silicon carbide film layer, amorphous silicon film layer, polycrystalline silicon film layer, magnesium fluoride film layer, and zinc sulfide film layer. That is to say, the color-adjusting film layer 312 may be a single-layer film or a composite film layer of multiple layers stacked together, and there is no specific limitation here.

[0091] Example 3

[0092] In some embodiments, the thickness of the color adjustment film 312 can be 20nm-560nm, and the refractive index of the color adjustment film 312 can be 1.4-3.5.

[0093] Thus, by adjusting the thickness and refractive index of the color adjustment film layer 312 within the aforementioned range, the color of the colored back contact solar cell 31 can basically cover various colors, thereby adapting to various application scenarios.

[0094] Specifically, in such an embodiment, the thickness of the color adjustment film 312 is preferably between 40nm and 300nm, and the refractive index is preferably between 1.4 and 2.6. By setting the thickness and refractive index of the color adjustment film 312 within this preferred range, it is possible to avoid the color becoming lighter and the brightness becoming lower due to the thickness of the color adjustment film 312 being too thick. At the same time, it is also possible to avoid the color adjustment film 312 being too thin, which would prevent the formation of the required color and result in a poor passivation effect. In addition, it is also possible to effectively avoid the phenomenon of unevenness in the deposition process caused by the film being too thin.

[0095] More specifically, in some embodiments, the color adjustment film layer 312 may be a silicon nitride film layer;

[0096] When the thickness of the silicon nitride film layer is in the range of 60-120 nm and the refractive index is 1.8-2.4, the color of the colored back contact solar cell 31 can be blue;

[0097] When the thickness of the silicon nitride film layer is in the range of 130-180nm and the refractive index is 1.8-2.4, the color of the colored back contact solar cell 31 can be gold.

[0098] When the color adjustment film layer 312 is a silicon nitride film layer with a thickness range of 120-130nm and a refractive index of 1.8-2.4, the color of the colored back contact solar cell 31 can be silver-white.

[0099] Thus, by setting the thickness and refractive index of the silicon nitride film layer in different ranges, the colored back contact solar cell 31 can have different colors to meet the needs of different scenarios.

[0100] It should be noted that the colors mentioned above are merely illustrative. It is understood that when users require different colors, the color of the colored back contact solar cell 31 can be adjusted to the user's desired color by adjusting the thickness and refractive index of the color adjustment film layer 312. No specific restrictions are imposed here.

[0101] Example 4

[0102] Please see Figure 4 In some embodiments, the color adjustment film layer 312 is a two-layer film structure, with the bottom film 313 having a refractive index of 1.8-2.4 and the top film 314 having a refractive index of 1.4-2.1.

[0103] Thus, by setting the color adjustment film layer 312 into two film layers with refractive indices in different ranges, the color of the colored back contact solar cell 31 and the overall reflectivity of the colored back contact solar cell 31 can be adjusted by adjusting the refractive indices of the two film layers, thereby adjusting the brightness.

[0104] Specifically, in this embodiment, a bottom layer film 313 is stacked on the light-receiving surface of the brightness-enhancing silicon wafer 311, and a top layer film 314 can be disposed above the bottom layer film 313. The refractive index of the bottom layer film 313 is preferably different from that of the top layer film 314 to achieve a combination of different refractive indices. The refractive index of the bottom layer film 313 can be 1.8, 1.9, 2.0, 2.1, 2.2, 2.4, 2.4, or any value from 1.8 to 2.4, and the refractive index of the top layer film 314 can be 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, or any value from 1.4 to 2.1; no specific limitation is imposed here.

[0105] Example 5

[0106] Please see Figure 5 In some embodiments, the color adjustment film layer 312 may include a first film layer 315 and a second film layer 316. The first film layer 315 is stacked on the light-receiving surface of the brightness enhancement silicon wafer 311, and the second film layer 316 is stacked on the side of the first film layer 315 away from the brightness enhancement silicon wafer 311. The refractive index of the first film layer 315 is less than the refractive index of the second film layer 316.

[0107] Thus, setting the refractive index of the first film layer 315 and the second film layer 316 stacked from the light-receiving surface of the brightness-enhancing silicon wafer 311 to a low-high arrangement can effectively prevent the color from darkening after lamination to form the module, and effectively improve the overall reflectivity of the colored back contact solar cell 31 and the colored cell module 100 to make the color more vibrant.

[0108] Specifically, in such an embodiment, the refractive index of the first film layer 315 can be 1.4-2.1, such as 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1 or any value between 1.4 and 2.1, and the refractive index of the second film layer 316 can be 1.8-2.4, such as 1.8, 1.9, 2.0, 2.1, 2.2, 2.4, 2.4 or any value between 1.8 and 2.4.

[0109] Further, please refer to Figure 6In some embodiments, the color adjustment film layer 312 may further include a third film layer 317, which is stacked between the first film layer 315 and the brightness enhancement silicon wafer 311. In this way, the color and reflectivity of the colored back contact solar cell 31 and the colored cell assembly 100 can also be adjusted by adjusting the thickness and refractive index of the third film layer 317.

[0110] Furthermore, in such an embodiment, the refractive index of the third film layer 317 may be greater than the refractive index of the first film layer 315.

[0111] Thus, the third film layer 317, the first film layer 315, and the second film layer 316 form a composite film layer with a high-low-high refractive index, which can further improve the reflectivity of the colored back contact solar cell 31 and the colored battery module 100, effectively preventing the colored back contact solar cell 31 from becoming dull after lamination to form the colored battery module 100, and giving it a bright and vivid color.

[0112] Specifically, in such embodiments, the first film layer 315, the second film layer 316, and the third film layer 317 can all be film layers of the same material. For example, they can all be one of the following: aluminum oxide film layer, silicon oxide film layer, silicon nitride film layer, silicon oxynitride film layer, titanium dioxide film layer, silicon carbide film layer, amorphous silicon film layer, polycrystalline silicon film layer, magnesium fluoride film layer, and zinc sulfide film layer. Of course, it is understood that in other embodiments, the materials of the first film layer 315, the second film layer 316, and the third film layer 317 can be the same for each other or all three can be different; no specific limitations are imposed here.

[0113] Furthermore, in some embodiments, the number of third film layers 317 can be a single layer or multiple layers, and there is no specific limitation here. The materials of different third film layers 317 can be the same or different. In addition, in some embodiments, a fourth film layer can be disposed above the second film layer 316, or multiple film layers can be disposed sequentially above the second film layer 316, and there is no specific limitation here. Moreover, in some embodiments, the number of anti-reverse composite films 40 can also be multiple. That is to say, in such embodiments, the first film layer 315 and the second film layer 316 can be repeatedly stacked to form multiple layers, and there is no specific limitation here.

[0114] Example 6

[0115] In some embodiments, the battery array 30 further includes colored solder strips (not shown) connecting the colored back contact solar cells 31.

[0116] In this way, the setting of colored solder ribbons can make the entire back of the battery array 30 have a colored effect.

[0117] Specifically, in such an embodiment, the back side of the colored back contact solar cell 31 has grid lines of different polarities in different polarity regions. For example, the positive electrode region on the back side of the colored back contact solar cell 31 has positive grid lines, and the negative electrode region has negative grid lines. The colored solder ribbon may include positive colored solder ribbon and negative colored solder ribbon. The positive colored solder ribbon is welded to the positive grid line to achieve current charging, and the negative colored solder ribbon is welded to the negative grid line to achieve current charging. There can be multiple positive and negative solder ribbons. The colored back contact solar cells 31 can be connected in series to form a battery string through the positive and negative colored solder ribbons.

[0118] In some embodiments, the battery array 30 may further include colored busbars (not shown) connected to colored solder ribbons. The colored busbars may include positive and negative busbars. The positive busbar can be connected to the positive colored solder ribbon to achieve positive current charging, and the negative busbar can be connected to the negative colored solder ribbon to achieve negative current charging. The colored busbars can connect multiple batteries in series to form the battery array 30. Thus, the arrangement of the colored busbars can also give the entire back surface of the battery array 30 a colored effect.

[0119] Of course, it is understood that in some embodiments, only the solder ribbon may be set as colored solder ribbon, while the busbar may be set as a conventional busbar. That is to say, the battery array 30 may only include colored solder ribbon connecting the colored back contact solar cells 31. In addition, in some embodiments, only the busbar may be set as colored busbar, while the solder ribbon may be set as a conventional solder ribbon. That is to say, the battery array 30 may include colored busbar connecting the colored back contact solar cells 31. The specifics are not limited here.

[0120] In addition, in some embodiments, only colored busbars may be provided instead of colored solder strips. In such cases, the colored busbars can be directly connected to the grid lines. For example, the positive colored busbar can be directly connected to the positive grid line to achieve negative current charging, and the negative busbar can be directly connected to the negative grid line to achieve negative current charging. No specific restrictions are imposed here.

[0121] Furthermore, in some embodiments, the color of the colored solder ribbon can be the same as the color of the colored back-contact solar cell 31. In this way, the front and back sides of the cell array 30 have substantially the same color, resulting in more uniform color and improved aesthetics.

[0122] Furthermore, in some embodiments, the color of the colored busbar is also the same as the color of the colored back-contact solar cell 31, thereby achieving color uniformity and improving aesthetics.

[0123] Understandably, in order to allow the back of the colored battery module 100 to display the colors of the colored solder strips and colored busbars, the back panel 50 of the colored battery module 100 can be a photovoltaic cover plate or tempered glass with good light transmittance.

[0124] Example 7

[0125] Please see Figure 2 In some embodiments, a colored shielding layer 60 may be provided between two adjacent colored back-contact solar cells 31.

[0126] Thus, the colored shielding layer 60 can cover and fill the gap between two adjacent colored back contact solar cells 31, thereby ensuring that the back solder strip and other structures cannot be observed from the front through the gap between the colored back contact solar cells 31, thus ensuring the aesthetic appearance.

[0127] Specifically, in such embodiments, the colored shielding layer 60 can be understood as a colored filler that can fill and block gaps, such as a colored film, colored glass, etc.

[0128] In this embodiment, the color of the colored shielding layer 60 can be the same as the color of the colored back-contact solar cell 31. This consistency between the color of the colored shielding layer 60 and the color of the solar cell ensures a more uniform appearance of the solar cell.

[0129] Of course, it is understood that in other embodiments, the color of the colored shielding layer 60 may not be different from the color of the battery cell, and no specific limitation is made here.

[0130] Example 8

[0131] In some embodiments, the backplate 50 of the color battery module 100 may be a colored backplate, which is disposed on the back surface of the colored back contact solar cell 31, and the color of the colored backplate may be consistent with the color of the colored back contact solar cell 31 in the color battery module 100. In this way, from an appearance perspective, the front and back of the entire color battery module 100 are colored and of the same color, which improves the aesthetics.

[0132] In addition, in some embodiments, the battery array 30 may include at least two different colors of back-contact solar cells.

[0133] Thus, the colored battery module 100 can also include colored solar cells 100 of different colors, so that the colored battery module 100 can present a variety of colors to enhance the aesthetics.

[0134] Table 1 below compares the reflectivity, brightness, and normalized efficiency of silicon wafers, colored back-contact solar cells 31, and colored battery modules 100 in traditional battery cell colorization technologies with those of the colored back-contact solar cells 31 and colored battery modules 100 in this application.

[0135] Table 1

[0136]

[0137] In Table 1 above, Comparative Example 1 is a component encapsulated with colored glass, Comparative Example 2 is a component encapsulated with glass printed with ink, and Comparative Example 3 is a component encapsulated with colored encapsulating film.

[0138] As shown in Table 1 above, in Comparative Examples 1-3, although the modules can be colored by printing ink, using colored glass, or using colored encapsulating film, the brightness of the colors is low, with the highest brightness of the modules reaching only 0.4. The colors are relatively dim, and there is also high parasitic absorption. The normalized efficiency is generally low, and the power is low. In contrast, in this application, the reflectivity of the light-receiving surface of the silicon wafer, the reflectivity of the colored back-contact solar cell 31, and the reflectivity of the module are all high, and the brightness is also high. The highest brightness of the module can reach 0.6, and the module has bright and vivid colors. At the same time, the normalized efficiency is also high, and the power is high.

[0139] Therefore, by adopting the technical solution of this application, without using colored ink, colored glass and colored encapsulating film, the efficiency of the module can be guaranteed, and the colored solar cell 100 and the colored solar module 100 can have bright and vivid colors.

[0140] Table 2 below compares the color, reflectivity, and brightness of conventional solar cells and modules with the colored back-contact solar cell 31 of this application.

[0141] Table 2

[0142]

[0143] As shown in Table 2 above, in traditional solar cells, the reflectivity and brightness of both the cells and modules are low across all colors. After being packaged into modules, the traditional modules exhibit low reflectivity and brightness, with dull or even absent colors, lacking vibrant color performance. However, in this application, the reflectivity and brightness of the modules are significantly improved across all colors, resulting in bright and vibrant colors in the colored solar cell module 100 of this application.

[0144] As can be seen from Tables 1 and 2 above, the new colorization technology proposed in this application can realize the colorization of solar cells and modules, and the resulting modules have higher conversion efficiency compared with traditional colorization technologies.

[0145] In the description of this specification, the use of terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., refers to specific features, structures, materials, or characteristics described in connection with the embodiments or examples, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0146] Furthermore, the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A colored battery assembly, characterized in that, The device includes a front panel, a front adhesive film, a battery array, a rear adhesive film, and a back panel stacked in sequence. The battery array includes several colored back-contact solar cells, and the reflectivity of the light-receiving surface of the colored back-contact solar cells is 5%-45%. The front adhesive film covers the light-receiving surface of the back-contact solar cells. The brightness of the colored back-contact solar cell is 0.1-0.8, and the reflectance of the light-receiving surface of the colored back-contact solar cell is the weighted average reflectance of the light-receiving surface of the colored back-contact solar cell in the visible light band.

2. The color battery assembly according to claim 1, characterized in that, The reflectivity of the light-receiving surface of the colored back-contact solar cell is 10%-40%.

3. The color battery assembly according to claim 1, characterized in that, The reflectivity of the light-receiving surface of the colored battery assembly is 2%-40%.

4. The color battery assembly according to claim 3, characterized in that, The reflectivity of the light-receiving surface of the colored battery assembly is 20%-35%.

5. The color battery assembly according to claim 1, characterized in that, The colored back-contact solar cell includes a brightness-enhancing silicon wafer and a color-adjusting film layer disposed on the light-receiving surface of the brightness-enhancing silicon wafer, wherein the reflectivity of the light-receiving surface of the brightness-enhancing silicon wafer is 15%-45%.

6. The color battery assembly according to claim 5, characterized in that, The thickness of the color adjustment film is 20nm-560nm, and the refractive index of the color adjustment film is 1.4-3.

5.

7. The color battery assembly according to claim 5, characterized in that, The color adjustment film layer includes a first film layer and a second film layer. The first film layer is stacked on the light-receiving surface of the brightness-enhancing silicon wafer, and the second film layer is stacked on the side of the first film layer away from the light-receiving surface of the brightness-enhancing silicon wafer. The refractive index of the first film layer is less than the refractive index of the second film layer.

8. The color battery assembly according to claim 7, characterized in that, The color adjustment film layer also includes a third film layer, which is stacked between the first film layer and the brightness enhancement silicon wafer.

9. The color battery assembly according to claim 8, characterized in that, The refractive index of the third film layer is greater than that of the first film layer.

10. The color battery assembly according to claim 1, characterized in that, The battery array includes colored solder strips connecting the colored back-contact solar cells; or The battery array includes colored busbars connecting the colored back-contact solar cells; or The battery array includes colored solder strips connecting the colored back-contact solar cells and colored busbars connecting the colored solder strips.

11. The color battery assembly according to claim 10, characterized in that, The color of the colored solder ribbon is the same as the color of the colored back-contact solar cell.

12. The color battery assembly according to claim 10, characterized in that, The color of the colored busbar is the same as the color of the colored back-contact solar cell.

13. The color battery assembly according to claim 1, characterized in that, A colored shielding layer is provided between two adjacent colored back-contact solar cells.

14. The color battery assembly according to claim 13, characterized in that, The color of the colored shielding layer is the same as the color of the colored back-contact solar cell.

15. The color battery assembly according to claim 1, characterized in that, The battery array includes back-contact solar cells of at least two different colors.

16. The color battery assembly according to claim 1, characterized in that, The backsheet is a colored backsheet, and the color of the colored backsheet is the same as the color of the colored back-contact solar cell.

17. A photovoltaic system, characterized in that, The color battery assembly includes any one of claims 1-16.

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