CN219017675U - Color battery assembly and photovoltaic system - Google Patents

Abstract

The application is applicable to the technical field of solar cells, and provides a color battery assembly and a photovoltaic system, wherein the color battery assembly comprises a front plate, a front adhesive film, a battery array, a rear adhesive film and a back plate which are sequentially stacked, and the reflectivity of a light receiving surface of a color back contact solar cell of the battery array is 5% -45%. Therefore, the brightness of the color back contact solar cell can be effectively improved within a reasonable range that the reflectivity of the light receiving surface of the color back contact solar cell is set to 5% -45%, the color back contact solar cell is ensured to have bright and bright colors after a cell array is formed and the color cell assembly is formed by packaging and laminating, the phenomenon that the brightness of the color cell assembly is greatly reduced after packaging and laminating to cause the darkness of the color is not obvious is avoided, and meanwhile, the colorization of the cell assembly is realized without adopting structures such as color glass, color packaging adhesive films or color ink, parasitic absorption is reduced, and the efficiency of the assembly is ensured.

Description

Color battery assembly and photovoltaic system

Technical Field

The application relates to the technical field of solar cells, in particular to a color battery assembly and a photovoltaic system.

Background

At present, the color solar cell module in the industry realizes the colorization of the solar cell module through structures such as color glass, color packaging adhesive films or color ink, and the like, and the cell in the color solar cell module usually adopts a conventional cell, so that the parasitic absorption of the light rays by the scheme is larger, and the module efficiency can be greatly influenced; there are also proposals in the industry to realize colorization of solar cell modules using colored cells which are textured on a silicon substrate and subsequently laminated with high/low refractive index films on the front side to make the cells appear different colors, but such cells, after being laminated and packaged into modules, can result in a significant reduction in brightness, insufficient brightness, and a darkened or even insignificant color.

Disclosure of Invention

The application provides a color battery assembly and a photovoltaic system, and aims to solve the technical problems that the color battery assembly is manufactured, and the color battery assembly is formed after packaging and has bright colors, and conversion efficiency is guaranteed.

The application is realized like this, and the color back contact solar cell that this application provided is including front bezel, preceding glued membrane, battery array, back glued membrane and the backplate that stacks gradually the setting, battery array includes a plurality of color back contact solar cell, the reflectivity of the light receiving surface of color back contact solar cell is 5% -45%, preceding glued membrane covers the light receiving surface of back contact solar cell.

Further, the reflectivity of the light receiving surface of the colored back contact solar cell is 10% -40%.

Further, the reflectivity of the light receiving surface of the color battery component is 2% -40%.

Further, the reflectivity of the light receiving surface of the color battery component is 20% -35%.

Further, the colored back contact solar cell comprises a brightness enhancement silicon wafer and a color adjustment film layer arranged on the light receiving surface of the brightness enhancement silicon wafer, wherein the reflectivity of the light receiving surface of the brightness enhancement silicon wafer is 15% -45%.

Further, the thickness of the color adjusting film layer is 20nm-560nm, and the refractive index of the color adjusting film layer is 1.4-3.5.

Still further, the color adjusting film layer comprises a first film layer and a second film layer, the first film layer is arranged on the light receiving surface of the brightness enhancement silicon wafer, the second film layer is arranged on one side of the first film layer, which is away from the light receiving surface of the brightness enhancement silicon wafer, and the refractive index of the first film layer is smaller than that of the second film layer.

Still further, the color adjusting film layer further comprises a third film layer, and the third film layer is arranged between the first film layer and the brightness enhancement silicon wafer.

Further, the refractive index of the third film layer is greater than the refractive index of the first film layer.

Further, the cell array comprises a colored solder strip connected with the colored back contact solar cell; or alternatively

The cell array comprises a color bus bar connected with the color back contact solar cell; or alternatively

The cell array comprises a colored solder strip connected with the colored back contact solar cell and a colored bus bar connected with the colored solder strip.

Further, the color of the color welding strip is the same as that of the color back contact solar cell.

Further, the color bus bar has the same color as the color back contact solar cell.

Furthermore, a color shielding layer is arranged between two adjacent color back contact solar cells.

Further, the color of the color shielding layer is the same as the color of the color back contact solar cell.

Still further, the cell array includes at least two different colors of the back contact solar cells.

Further, the back plate is a color back plate, and the color of the color back plate is consistent with the color of the color back contact solar cell.

The application also provides a photovoltaic system comprising the color cell assembly of any one of the above.

In the color battery assembly and the photovoltaic system of the embodiment of the application, the brightness of the color back contact solar battery piece can be effectively improved within a reasonable range that the reflectivity of the light receiving surface of the color back contact solar battery piece is set to be 5% -45%, the color back contact solar battery piece is ensured to have bright and vivid colors after a battery array is formed and the color battery assembly is formed by packaging and laminating, the color battery assembly is prevented from being greatly reduced in brightness after the packaging and laminating due to the adoption of the assembly of the color back contact solar battery piece, the color of the battery assembly is not obvious due to the fact that color is not obvious, and meanwhile, structures such as color glass, color packaging adhesive films or color ink are not required to be adopted to realize the colorization of the battery assembly, parasitic absorption is reduced, and the efficiency of the assembly is ensured.

Additional aspects and advantages of the 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 the application.

Drawings

FIG. 1 is a schematic block diagram of a photovoltaic system provided herein;

FIG. 2 is a schematic view of the structure of the color cell assembly provided herein;

fig. 3 is a schematic structural diagram of a color back contact solar cell provided in the present application;

FIG. 4 is another schematic view of a color back contact solar cell provided herein;

FIG. 5 is a schematic view of a further structure of the color back contact solar cell provided herein;

fig. 6 is a schematic view of still another structure of the color back contact solar cell provided in the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. Furthermore, it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

In the description of the present application, it should be understood that the terms "upper," "lower," "horizontal," "top," "bottom," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or usage scenarios for other materials.

In this application, through setting the reflectivity of the light receiving surface of the colored back contact solar cell to 5% -45% within a reasonable range, the brightness of the colored back contact solar cell can be effectively improved, the colored back contact solar cell is ensured to be formed into a cell array and the color cell component is packaged and laminated, the colored cell component is enabled to be bright and bright, the brightness of the colored solar cell component is greatly reduced after packaging and lamination due to the component of the colored back contact solar cell, the color is not obvious, and meanwhile, the colorization of the cell component is realized without adopting structures such as colored glass, a colored packaging adhesive film or colored ink, so that parasitic absorption is reduced, and the efficiency of the component is ensured.

Example 1

Referring to fig. 1-2, a photovoltaic system 1000 in an embodiment of the present application may include a color cell assembly 100 in an embodiment of the present application, where the color cell assembly 100 in an embodiment of the present application may include a front plate 10, a front adhesive film 20, a cell array 30, a back adhesive film 40 and a back plate 50 that are sequentially stacked, the cell array 30 includes a plurality of color back contact solar cells 31, a reflectivity of a light receiving surface of the color back contact solar cells 31 is 5% -45%, and the front adhesive film 20 covers the light receiving surface of the color back contact solar cells 31.

In the color battery assembly 100 and the photovoltaic system 1000 of the embodiments of the present application, the reflectivity of the light receiving surface of the color back contact solar cell 31 is set to be 5% -45%, which is a reasonable range, so that the brightness of the color back contact solar cell 31 can be effectively improved, the color back contact solar cell 31 is ensured to form the battery array 30, and after the color battery assembly 100 is formed by packaging and laminating, the color battery assembly 100 also has bright and vivid colors, the color is prevented from being inconspicuous due to the fact that the brightness of the color solar cell assembly 200 is greatly reduced after the packaging and laminating by adopting the assembly of the color back contact solar cell 31, and meanwhile, the colorization of the battery assembly is realized without adopting structures such as color glass, color packaging adhesive film or color ink, so that parasitic absorption is reduced, and the efficiency of the assembly is ensured.

In the present application, the colored back contact solar cell 31 refers to a back contact solar cell having a color, and the color refers to a color other than black and white.

In the present application, the brightness of the colored back contact solar cell 31 is adapted to the reflectance of the light receiving surface of the colored back contact solar cell 31 of 5% -45%, that is, the reflectance of the light receiving surface of different colored back contact solar cells 31 corresponds to the different brightness of the colored back contact solar cell 31.

It should be noted that "reflectance of the light receiving surface of the color back contact solar cell 31" refers to an overall reflectance of the front surface of the cell in air after the entire color back contact solar cell 31 is fabricated, and not to a reflectance of the uppermost surface of the color back contact solar cell 31.

Further, in the embodiments of the present application, "the reflectance of the light receiving surface of the color back contact solar cell 31" may be understood as an average reflectance or a weighted average reflectance of the light receiving surface of the color back contact solar cell 31 in the visible light band. In the following, reference is also made to the description herein for the understanding that the same or similar descriptions (e.g., reflectivity of a certain element) are present.

The average reflectance is understood as an average value of reflectance of light rays of respective wavelengths in the visible light band (380 nm to 780 nm) on the light receiving surface of the color back contact solar cell 31.

The weighted average reflectivity can then be determined by the following formula:

wherein WAR represents a weighted average reflectivity; λ represents a wavelength; phi (lambda) represents the luminous flux of the corresponding wavelength; r (λ) represents the reflectance of the corresponding wavelength.

Specifically, in some embodiments, the reflectivity of the light receiving surface of the color back contact solar cell 31 may be measured by a D8 reflectometer, an ultraviolet-visible near infrared spectrophotometer, an ellipsometer, or the like, and each reflectivity mentioned below may be measured by these together.

In the embodiment of the present application, the color back contact solar cell 31 may be a half-cell or a full-cell, and is not limited herein.

In the present application, the plurality of colored back contact solar cells 31 in the colored battery assembly 100 may be sequentially connected in series to form a battery string, and each battery string may be connected in series, in parallel, or combined in series and parallel to form a battery array and realize the current bus output, for example, the connection of each battery string may be realized by providing a solder strip, a bus bar, an interconnection bar, or the like.

It is to be understood that, in the embodiment of the present application, the front adhesive film 20 may be filled between the front surface of the battery array 30 and the front plate 10, the rear adhesive film 40 may be filled between the back surface of the battery array 30 and the back plate 50, etc., and as a filler, both may be transparent adhesives with good light transmittance and ageing resistance, for example, the adhesive film may be a transparent EVA adhesive film or a transparent POE adhesive film, which may be specifically selected according to practical situations, and is not limited herein.

The front plate 10 may be a photovoltaic glass, which may be coated on the front adhesive film 20, and the photovoltaic glass may be a super white glass, which has high light transmittance, high transparency, and excellent physical, mechanical, and optical properties, for example, the light transmittance of the super white glass may be up to 92% or more, which may protect the colored back contact solar cell 31 without affecting the efficiency of the colored back contact solar cell 31 as much as possible.

The back sheet 50 may also be photovoltaic glass or toughened glass, organic glass, aluminum alloy TPT composite adhesive film, etc., which may be specifically set according to specific situations, and is not limited herein. The front adhesive film 20 may bond the photovoltaic glass and the cell array 30 together, and the rear adhesive film 40 may bond the cell array 30 and the back sheet 50 together, thereby integrally forming the color cell assembly 100.

Further, in the present embodiment, the photovoltaic system 1000 may be applied to a photovoltaic power station, such as a ground power station, a roof power station, a water power station, or the like, and may also be applied to a device or apparatus that generates electricity using solar energy, such as a user solar power source, a solar street lamp, a solar car, a solar building, or the like. Of course, it is understood that the application scenario of the photovoltaic system 1000 is not limited thereto, that is, the photovoltaic system 1000 may be applied in all fields where solar energy is required to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system 1000 may include a photovoltaic array, a junction box and an inverter, where the photovoltaic array may be an array combination of a plurality of color battery assemblies 100, for example, the plurality of color battery assemblies 100 may form a plurality of photovoltaic arrays, the photovoltaic array is connected to the junction box, the junction box may junction currents generated by the photovoltaic array, and the junction box may convert the junction currents into alternating currents required by a utility power network through the inverter, and then access the utility power network to realize solar power supply.

In the present application, the brightness of the color back contact solar cell 31 may be 0.1 to 0.8. In this way, the reflectance of the light receiving surface of the color back contact solar cell 31 is within the reasonable range of 5% -45%, so that the brightness of the color solar cell 100 is within the reasonable range of 0.1-0.8, the brightness of the color back contact solar cell 31 is effectively improved, the effective color back contact solar cell 31 is ensured to have bright and bright colors after the color cell assembly 100 is formed by packaging and laminating, and meanwhile, the conversion efficiency is also prevented from being lowered due to overhigh brightness.

In this application, "brightness" refers to an L value in the color space HSL, specifically, brightness herein is defined as a normalized brightness value calculated and measured at an observation angle of 2 ° under a D50 light source in the color space HSL.

Further, in some embodiments, the reflectance of the light receiving surface of the color back contact solar cell 31 may be preferably 10% -40%.

Thus, setting the overall reflectance of the colored back contact solar cell 31 within this optimum range can enable the colored back contact solar cell 31 to also enable the colored cell 100 to have a bright and vivid color after the colored cell 100 is formed by encapsulation lamination.

Specifically, in such an embodiment, the reflectance of the light receiving surface of the color back contact solar cell 31 may be any one of 10%, 15%, 20%, 25%, 30%, 35%, 40% or 10% -40%, and is not limited herein.

In such an embodiment, the brightness of the colored back contact solar cell 31 is 0.2-0.8. In this way, by setting the reflectance of the light receiving surface of the color back contact solar cell 31 to be in the optimal range of 10% -40%, the brightness of the color solar cell 100 can be in the optimal range of 0.2-0.8, so that the color back contact solar cell 31 can be ensured to have bright and bright color after being packaged and laminated into the color cell assembly 100 while ensuring the efficiency, and meanwhile, the conversion efficiency can be prevented from being lowered due to too high brightness.

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

Therefore, the reflectivity of the whole color back contact solar cell 31 is within the reasonable range, so that the brightness of the whole color cell assembly 100 can be effectively ensured to be in a reasonable range, the phenomenon that the color is dull and is not obvious due to the too low brightness of the color cell assembly 100 is avoided, and the problem that the conversion efficiency is low due to the too high brightness is also avoided.

It should be noted that the "reflectivity of the light receiving surface of the color cell assembly 100" refers to the reflectivity of the entire assembly after the entire color cell assembly 100 is manufactured, and not to the reflectivity of the uppermost surface of the color cell assembly 100, for example, it is understood that the reflectivity of the assembly formed by laminating and packaging the plurality of color back contact solar cells 31 through the front adhesive film 20, the front plate 10, the back adhesive film 40 and the back plate 50 is determined by the reflectivity of the light receiving surface of the color back contact solar cells 31, the reflectivity of the front adhesive film 20 and the reflectivity of the front plate 10. The definition and measurement of the reflectance of the light-receiving surface of the color back-contact solar cell 31 can be referred to as the definition and measurement of the reflectance of the light-receiving surface, and are not described herein.

In such an embodiment, the brightness of the color battery assembly 100 may be 0.1-0.6. Therefore, the reflectance of the light receiving surface of the color battery assembly 100 is within a reasonable range of 2% -40%, so that the brightness of the color battery assembly 100 is within a reasonable range of 0.1-0.6, and the assembly is ensured to have bright and vivid colors.

Preferably, in some embodiments, the reflectivity of the light receiving surface of the color cell assembly 100 may be preferably 20% -35%.

In this case, it is preferable that the color battery assembly 100 has a brightness of 0.15 to 0.6.

Thus, the reflectivity of the light receiving surface of the color battery assembly 100 is set within the preferred range, so that the brightness of the color battery assembly 100 can be ensured to be within the preferred range of 0.15-0.6, the assembly can be ensured to have bright and bright colors, and the conversion efficiency is prevented from being lowered due to over-high brightness.

Specifically, in such embodiments, the reflectance of the color cell assembly 100 may be any one of 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 35%, or 20% -35%, particularly without limitation herein. The brightness of the color cell assembly 100 may 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, and is not limited herein, and different reflectivities correspond to different brightnesses.

Example two

Referring to fig. 3, in some embodiments, the color back contact solar cell 31 includes a brightness enhancement silicon wafer 311 and a color adjustment film 312 disposed on a light receiving surface of the brightness enhancement silicon wafer 311, where the reflectivity of the light receiving surface of the brightness enhancement silicon wafer 311 is 15% -45%.

The light receiving surface of the brightness enhancement silicon wafer 311 refers to the upper surface of the brightness enhancement silicon wafer 311, and the color of the color back contact solar cell 31 is adapted to the thickness and the refractive index of the color adjustment film 312, that is, the color of the color back contact solar cell 31 may be determined by the thickness and the refractive index of the color adjustment film 312, and different thickness ranges and refractive index ranges correspond to different colors and different brightnesses.

In the present application, the reflectivity and brightness of the light receiving surface of the color back contact solar cell 31 are adapted to the reflectivity of the light receiving surface of the brightness enhancement silicon wafer 311, that is, in the case that the color adjustment film 20 is the same, the reflectivities of the light receiving surfaces of the different brightness enhancement silicon wafers 311 correspond to the different reflectivities and brightnesses of the color back contact solar cell 31.

In this way, when the color back contact solar cell 31 is manufactured, the thickness and refractive index of the color adjustment film 312 can be reasonably adjusted in the manufacturing process, so that colorization of the color back contact solar cell 31 and the color cell module 100 can be realized without using ink glass, color glass or color packaging adhesive film to realize colorization of the color cell module 100 in lamination packaging, unstable modules caused by environmental influence of printed ink can be avoided, stability and reliability of the modules are improved, cost is reduced, and meanwhile, lower conversion efficiency caused by higher parasitic absorption caused by adoption of printed ink, color glass or color packaging adhesive film can be avoided, and conversion efficiency of the color cell module 100 is improved.

Meanwhile, the reflectance of the light receiving surface of the brightness enhancement silicon chip 311 is set within a reasonable range of 15% -45%, so that the reflectance of the color back contact solar cell 31 is ensured to be within a reasonable range of 5% -45%, the brightness of the color back contact solar cell 31 is effectively improved, the color back contact solar cell 31 is ensured to have bright and vivid colors after being packaged and laminated into a component, and the problem that the component adopting the color back contact solar cell 31 causes the brightness of the color solar cell component 200 to be greatly reduced after being packaged and laminated, so that the color is not obvious is avoided.

The reflectance of the light receiving surface of the brightness enhancement silicon wafer 311 refers to the reflectance of the light receiving surface of the brightness enhancement silicon wafer 311 in air when the color adjustment film layer 312 is not provided on the brightness enhancement silicon wafer 311. The "reflectivity of the light receiving surface of the color back contact solar cell 31" refers to the overall reflectivity of the front surface of the cell after the entire color back contact solar cell 31 is fabricated, for example, it can be understood that the reflectivity after the color adjustment film 312 is fabricated on the light receiving surface of the brightness enhancement silicon wafer 311 is determined by the reflectivity of the light receiving surface of the brightness enhancement silicon wafer 311 and the reflectivity of the color adjustment film 312.

Furthermore, it should be noted that, in the embodiment of the present application, the color adjustment film 312 has a passivation function, that is, the color adjustment film 312 may change the color of the color back contact solar cell 31 and also has a passivation function, so as to improve the conversion efficiency of the color back contact solar cell 31.

Specifically, in this application, in order to achieve the high reflectivity and clean light receiving surface of the brightness enhancement silicon wafer 311, the brightness enhancement silicon wafer 311 may be subjected to chemical treatment, such as damage removal, acid polishing or alkali polishing, chemical mechanical polishing, electrochemical polishing, or texturing, and then the above treatment.

For example, in some embodiments, the light receiving surface of the brightness enhancement silicon wafer 311 is a planarized surface, and the brightness enhancement silicon wafer 311 may be polished with an acidic solution such as hydrofluoric acid, nitric acid, or the like to planarize the light receiving surface of the brightness enhancement silicon wafer 311, and in other embodiments, the brightness enhancement silicon wafer 311 may be polished with an alkaline solution such as potassium hydroxide, sodium hydroxide, or the like to planarize the light receiving surface of the brightness enhancement silicon wafer 311, and the specific planarization process is not limited herein.

In the embodiment of the present application, the brightness of the color back contact solar cell 31 is positively correlated with the reflectance of the light receiving surface of the brightness enhancement silicon wafer 311. In this way, the overall reflectivity of the color back contact solar cell 31 can be adjusted by adjusting the reflectivity of the light receiving surface of the brightness enhancement silicon wafer 311 in the manufacturing process, so that the brightness of the color back contact solar cell reaches a proper range, and the phenomenon that the brightness of the component is greatly reduced after encapsulation lamination, and the color is not obvious is avoided. So that the color battery assembly 100 formed by the encapsulation lamination has a bright and vivid color.

In the embodiment of the present application, the reflectance of the light receiving surface of the brightness enhancement silicon wafer 311 may be preferably 20% to 40%.

In this way, setting the reflectivity of the light receiving surface of the brightness enhancement silicon chip 311 in the above preferred range can make the reflectivity of the color back contact solar cell 31 in a preferred range, so that the brightness thereof is in a preferred range, thereby realizing an optimized color effect and avoiding the color cell assembly 100 from being insufficiently bright and vivid after packaging and lamination to the greatest extent.

Specifically, in such embodiments, the reflectance of the light receiving surface of the brightness enhancement silicon wafer 311 may be any one of 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, or 20% -40%.

In the conventional technology, the reflectivity of the light receiving surface of the brightness enhancement silicon chip 311 is usually 4% -15%, the reflectivity is lower without flattening treatment, and after the package lamination is performed to form a component, the brightness of the component can be greatly reduced, so that the color is not obvious, and even the color is lost. In the conventional technical solution, in order to realize colorization of the assembly formed after lamination, the following technology is generally adopted:

1. when the assembly is packaged, the glass printed with the printing ink is used for packaging;

2. when the components are packaged, colored glass is adopted for packaging;

3. and packaging by adopting a color packaging adhesive film when packaging the components.

However, the adoption of the conventional technical scheme 1 can lead to serious light absorption of the whole assembly, and the ink can lead to unstable assembly after long-time use, and has lower reliability and lower conversion efficiency. The adoption of the above-mentioned conventional technical schemes 2 and 3 also results in serious light absorption of the whole assembly and lower conversion efficiency.

Aiming at the technical scheme of colorization of the traditional component, the inventor of the application finds that when colorization of the battery piece is realized, the colorization of the battery piece and the component can be realized by adjusting the thickness and the refractive index of the color adjusting film layer 312 in the application in the manufacturing process, and the colorization is realized without adopting a mode of printing ink, colored glass and a color packaging adhesive film, so that parasitic absorption of light is reduced, and the conversion efficiency is improved. Meanwhile, the inventor of the present application has found that by processing (for example, flattening) the light-receiving surface of the brightness enhancement silicon wafer 311 and setting the reflectivity of the light-receiving surface of the brightness enhancement silicon wafer 311 to be 15% -45% within a reasonable range, the reflectivity of the color back contact solar cell 31 is ensured to be 5% -45%, so as to improve the brightness of the color back contact solar cell 31, and in the subsequent process of laminating the color back contact solar cell 31 to form the color cell assembly 100, the color and brightness of the color cell assembly 100 will not change significantly, so that the color cell assembly 100 also has a bright color.

That is, by adopting the technical scheme of the application, the ink, the colored glass and the colored packaging adhesive film are not needed, the light absorption is less, the reliability is higher, the conversion efficiency is effectively ensured, and meanwhile, the brightness of the colored back contact solar cell 31 can be improved, so that the colored back contact solar cell 31 has bright and bright color, and even after being packaged into the colored battery assembly 100, the colored battery assembly 100 has bright and bright color. That is, compared to the conventional colorization schemes 1-3, the present application can improve the conversion efficiency and make the color battery assembly 100 have higher brightness, so that the color battery assembly 100 has bright and vivid colors, and the reliability of the assembly of the color battery assembly 100 can be improved.

Further, in embodiments of the present application, the color adjustment film 312 may be a combination of one or more of an aluminum oxide film, a silicon nitride film, a silicon oxynitride film, a titanium dioxide film, a silicon carbide film, an amorphous silicon film, a polysilicon film, a magnesium fluoride film, and a zinc sulfide film. That is, the color adjusting film layer 312 may be a single film or a composite film layer formed by laminating a plurality of films, and is not limited thereto.

Example III

In some embodiments, the thickness of the color-modifying film 312 may be 20nm-560nm and the refractive index of the color-modifying film 312 may be 1.4-3.5.

As such, adjusting the thickness and refractive index of the color adjustment film layer 312 within the above-described ranges may enable the color of the color back contact solar cell 31 to substantially cover various colors, thereby adapting to various usage scenarios.

Specifically, in such an embodiment, the thickness of the color adjusting film 312 may be preferably 40nm to 300nm, and the refractive index may be preferably 1.4 to 2.6, so that the color is made lighter and the brightness is made lower by setting the thickness and refractive index of the color adjusting film 312 within such preferable ranges, and the color adjusting film 312 is made too thin to form a desired color and to deteriorate the passivation effect, and the film is made too thin to cause non-uniformity during the deposition process.

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

when the thickness of the silicon nitride film layer ranges from 60nm to 120nm and the refractive index is 1.8 to 2.4, the color of the color back contact solar cell 31 can be blue;

When the thickness of the silicon nitride film layer is 130-180nm and the refractive index is 1.8-2.4, the color of the color back contact solar cell 31 can be gold;

when the color adjustment film 312 is a silicon nitride film, the thickness of the silicon nitride film ranges from 120 nm to 130nm, and the refractive index ranges from 1.8 to 2.4, the color of the color back contact solar cell 31 may be silvery white.

In this way, the thickness and refractive index of the silicon nitride film layer are set in different ranges, so that the color back contact solar cell 31 has different colors to meet different scene requirements.

It should be noted that the above colors are only exemplary colors, and it should be understood that, when the user needs different other different colors, the color of the color back contact solar cell 31 may be adjusted to the color desired by the user by adjusting the thickness and the refractive index of the color adjusting film layer 312, which is not limited herein.

Example IV

Referring to fig. 4, in some embodiments, the color adjusting film 312 has a two-layer structure, the bottom film 313 has a refractive index of 1.8-2.4, and the top film 314 has a refractive index of 1.4-2.1.

In this way, the color adjusting film 312 is configured as two films with refractive indexes in different ranges, and the color of the color back contact solar cell 31 and the overall reflectivity of the color back contact solar cell 31 can be adjusted by adjusting the refractive indexes of the two films to adjust the brightness.

Specifically, in such an embodiment, the underlayer film 313 is stacked on the light receiving surface of the brightness enhancement silicon wafer 311, the top layer film 314 may be disposed above the underlayer film 313, and the refractive index of the underlayer film 313 may preferably be 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 may be any one of 1.8, 1.9, 2.0, 2.1, 2.2, 2.4, or 1.8-2.4, and the refractive index of the top layer film 314 may be any one of 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, or 1.4-2.1, and is not particularly limited herein.

Example five

Referring to fig. 5, in some embodiments, the color adjusting film 312 may include a first film 315 and a second film 316, the first film 315 is stacked on the light-receiving surface of the brightness enhancement silicon chip 311, the second film 316 is stacked on a side of the first film 315 facing away from the brightness enhancement silicon chip 311, and the refractive index of the first film 315 is smaller than that of the second film 316.

In this way, the arrangement in which the refractive indexes of the first film layer 315 and the second film layer 316 laminated from the light receiving surface of the brightness enhancement silicon wafer 311 to the top are set to be low-high can effectively avoid darkening of the color after the assembly is formed by lamination, and effectively improve the overall reflectivity of the color back contact solar cell 31 and the color cell assembly 100 to improve the color to be more vivid.

Specifically, in such embodiments, the refractive index of the first film 315 may be any value between 1.4 and 2.1, such as 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, or 1.4 and 2.1, and the refractive index of the second film 316 may be any value between 1.8 and 2.4, such as 1.8, 1.9, 2.0, 2.1, 2.2, 2.4, or 1.8 and 2.4.

Further, referring to fig. 6, in some embodiments, the color adjusting film 312 may further include a third film 317, and the third film 317 is stacked between the first film 315 and the brightness enhancement silicon chip 311. In this way, the color and reflectance of the color back contact solar cell 31 and the color cell assembly 100 are also adjusted by adjusting the thickness and refractive index of the third film layer 317.

Still further, in such embodiments, the refractive index of the third film layer 317 may be greater than the refractive index of the first film layer 315.

In this way, the third film 317, the first film 315 and the second film 316 form a composite film with a refractive index of high-low-high, which can further improve the reflectivity of the color back contact solar cell 31 and the color cell assembly 100, and effectively avoid the color of the color back contact solar cell 31 from becoming dull after the color back contact solar cell 31 is laminated to form the color cell assembly 100, so that the color back contact solar cell assembly has bright and vivid color.

Specifically, in such an embodiment, the first film 315, the second film 316, and the third film 317 may be all made of the same material, for example, one of an aluminum oxide film, a silicon nitride film, a silicon oxynitride film, a titanium dioxide film, a silicon carbide film, an amorphous silicon film, a polysilicon film, a magnesium fluoride film, and a zinc sulfide film. Of course, it is understood that in other embodiments, the materials of the first film 315, the second film 316 and the third film 317 may be two-to-two or different, which is not limited herein.

In addition, in some embodiments, the number of third film layers 317 may be single or multiple, and in particular, the material of the different third film layers 317 may be the same or different. In addition, in some embodiments, a fourth film layer may be disposed above the second film layer 316 or a plurality of film layers may be disposed sequentially above the second film layer 316, which is not limited herein. Further, in some embodiments, the number of the lamination films 40 may be increased, that is, in such embodiments, the first film layer 315 and the second film layer 316 may be repeatedly stacked to be multiple layers, which is not limited herein.

Example six

In some embodiments, the cell array 30 further includes a colored solder strip (not shown) that connects the colored back contact solar cells 31.

In this way, the color welding strips can provide a color effect on the whole back surface of the battery array 30.

Specifically, in such an embodiment, the regions of different polarities of the back surface of the color back contact solar cell 31 are provided with the grid lines of different polarities, for example, the positive electrode region of the back surface of the color back contact solar cell 31 is provided with the positive electrode grid line, the negative electrode region is provided with the negative electrode grid line, the color welding strip may include a positive electrode color welding strip and a negative electrode color welding strip, the positive electrode color welding strip and the positive electrode grid line are welded together to realize the bus bar, the negative electrode color welding strip and the negative electrode grid line are welded together to realize the bus bar, the number of the positive electrode welding strip and the negative electrode welding strip may be plural, and the color back contact solar cell 31 may be connected in series by the positive electrode color welding strip and the negative electrode color welding strip to form the cell string.

In some embodiments, the battery array 30 may further include color bus bars (not shown) connected to the color welding strips, the color bus bars may include positive electrode bus bars and negative electrode bus bars, the positive electrode bus bars may be connected to the positive electrode color welding strips to implement positive electrode bus bars, the negative electrode bus bars may be connected to the negative electrode color welding strips to implement negative electrode bus bars, and the color bus bars may connect a plurality of battery strings to form the battery array 30. In this way, the arrangement of the color bus bars can also give a color effect to the entire back surface of the battery array 30.

Of course, it will be appreciated that in some embodiments, it is also possible to provide only the solder strips as colored solder strips, while the bus bars are provided as conventional bus bars, that is, the cell array 30 may include only colored solder strips connecting the colored back contact solar cells 31. Furthermore, in some embodiments, only the bus bars may be provided as color bus bars, and the solder strips may be provided as conventional solder strips, that is, the cell array 30 may include color bus bars connected to the color back contact solar cells 31, which is not limited herein.

In addition, in some embodiments, the color bus bar may be provided without a color welding strip, in which case the color bus bar may be directly connected to the grid line, for example, the positive color bus bar may be directly connected to the positive grid line to implement the negative bus bar, and the negative bus bar may be directly connected to the negative grid line to implement the negative bus bar, which is not limited herein.

Further, in some embodiments, the color of the color solder strip may be the same as the color of the color back contact solar cell 31. In this way, the front and rear surfaces of the battery array 30 have substantially the same color, so that the color is more uniform, and the aesthetic appearance is improved.

Furthermore, in some embodiments, the color of the color bus bar is the same as that of the color back contact solar cell 31, so that color uniformity is achieved and aesthetic feeling is improved.

It will be appreciated that the back sheet 50 of the color cell assembly 100 may be a photovoltaic cover sheet or tempered glass having good light transmission properties in order to enable the back side of the color cell assembly 100 to exhibit the color of the color solder strips and the color bus bars.

Example seven

Referring to fig. 2, in some embodiments, a color shielding layer 60 may be disposed between two adjacent color back contact solar cells 31.

In this way, the color shielding layer 60 can cover and fill the gap between two adjacent color back contact solar cells 31, so that the structure that the solder strip and the like on the back cannot be observed from the front through the gap between the color back contact solar cells 31 is ensured, and the aesthetic appearance is ensured.

In particular, in such embodiments, the color shielding layer 60 may be understood as a color filler, such as a color film, a color glass, or the like, capable of filling and shielding the slit.

In such embodiments, the color of the color shielding layer 60 may be the same as the color of the color back contact solar cell 31. In this way, the color of the color shielding layer 60 is consistent with the color of the battery piece, so that the appearance color of the battery piece can be ensured to be more uniform.

Of course, it is understood that in other embodiments, the color of the color shielding layer 60 may not be different from the color of the battery sheet, and is not limited herein.

Example eight

In some embodiments, the back sheet 50 of the color cell assembly 100 may be a color back sheet, which is disposed on the back light surface of the color back contact solar cell 31, and the color of the color back sheet may be consistent with the color of the color back contact solar cell 31 in the color cell assembly 100. Thus, the front and back surfaces of the entire color battery assembly 100 are colored and have the same color from the external appearance, thereby improving the aesthetic appearance.

Further, in some embodiments, the cell array 30 may include at least two different colored back contact solar cells.

In this way, the color solar cell 100 may also include color solar cell pieces 100 with different colors, so that the color solar cell 100 may exhibit various colors to improve the aesthetic feeling.

Table 1 below is a comparison table of the reflectance, brightness and normalized efficiency of the silicon wafer, the colored back contact solar cell 31 and the colored cell assembly 100 in the conventional cell colorization technology with the colored back contact solar cell 31 and the colored cell assembly 100 in the present application.

TABLE 1

In table 1 above, comparative example 1 is a module packaged with colored glass, comparative example 2 is a module packaged with glass printed with ink, and comparative example 3 is a module packaged with a colored packaging film.

As can be seen from table 1, in comparative examples 1 to 3, although the components can be colored after being packaged by printing ink, using colored glass or using a colored packaging film, the brightness of the color is lower, the brightness of the components can only reach 0.4 at the highest, the color is darker, and meanwhile, the parasitic absorption is higher, the normalization efficiency is generally lower, the power is lower, and in the present 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 components are higher, the brightness is also higher, the brightness of the components can reach 0.6 at the highest, the components have bright and bright colors, and the normalization efficiency is also higher, and the power is higher.

Therefore, by adopting the technical scheme of the application, under the condition that color ink, color glass and color packaging adhesive films are not adopted, the efficiency of the assembly can be ensured, and the color battery piece 100 and the color battery assembly 100 can have bright and vivid colors.

Table 2 below is a comparison of the color, reflectivity and brightness of conventional cells and assemblies with the color back contact solar cell 31 of the present application.

TABLE 2

As can be seen from table 2, in the conventional battery sheet, the reflectivity of the battery sheet and the brightness of the assembly are lower in each color, and the reflectivity and brightness of the assembly formed by packaging the battery sheet into the assembly are lower in the conventional assembly, the color is darker or even substantially disappeared, and the battery sheet does not have a vivid color function. However, in the present application, the reflectance and brightness of the assembly are greatly improved in each color, so that the color battery assembly 100 of the present application has bright and vivid colors.

It can be seen from the above tables 1 and 2 that the new colorization technology proposed in the present application can realize colorization of the battery plate and the assembly, and the formed assembly has higher conversion efficiency compared with the conventional colorization technology.

In the description of the present specification, reference to the terms "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the foregoing description of the preferred embodiment is provided for the purpose of illustration only, and is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (17)

1. The color battery assembly is characterized by comprising a front plate, a front adhesive film, a battery array, a rear adhesive film and a back plate which are sequentially stacked, wherein the battery array comprises a plurality of color back contact solar cells, the reflectivity of the light receiving surface of each color back contact solar cell is 5% -45%, and the front adhesive film covers the light receiving surface of each back contact solar cell.

2. The color cell assembly of claim 1, wherein the reflectance of the light-receiving surface of the color back-contact solar cell is from 10% to 40%.

3. The color cell assembly of claim 1, wherein the reflectance of the light-receiving surface of said color cell assembly is from 2% to 40%.

4. A color cell assembly as defined in claim 3, wherein the reflectance of the light-receiving surface of said color cell assembly is 20-35%.

5. The color cell assembly according to claim 1, wherein said color back contact solar cell comprises a brightness enhancement silicon wafer and a color adjusting film layer disposed on a light receiving surface of said brightness enhancement silicon wafer, and wherein a reflectance of said light receiving surface of said brightness enhancement silicon wafer is 15% -45%.

6. The color cell assembly of claim 5, wherein said color-adjusting film layer has a thickness of 20nm-560nm and a refractive index of 1.4-3.5.

7. The color cell assembly of claim 5, wherein said color-adjusting film comprises a first film layer disposed on said light-receiving surface of said brightness enhancement silicon wafer and a second film layer disposed on a side of said first film layer facing away from said light-receiving surface of said brightness enhancement silicon wafer, said first film layer having a refractive index less than a refractive index of said second film layer.

8. The color cell assembly of claim 7, wherein said color-modifying film layer further comprises a third film layer disposed layer upon layer between said first film layer and said brightness enhancement silicon wafer.

9. The color cell assembly of claim 8, wherein the refractive index of said third film layer is greater than the refractive index of said first film layer.

10. The color cell assembly of claim 1, wherein said cell array comprises a color solder strip connecting said color back contact solar cells; or alternatively

The cell array comprises a color bus bar connected with the color back contact solar cell; or alternatively

The cell array comprises a colored solder strip connected with the colored back contact solar cell and a colored bus bar connected with the colored solder strip.

11. The color cell assembly of claim 10, wherein the color solder strip has the same color as the color back contact solar cell.

12. The color cell assembly of claim 10, wherein the color bus bar is the same color as the color back contact solar cell.

13. The color cell assembly of claim 1, wherein a color shielding layer is disposed between two adjacent color back contact solar cells.

14. The color cell assembly of claim 13, wherein the color shielding layer has the same color as the color of the color back contact solar cell.

15. The color cell assembly of claim 1, wherein said cell array comprises at least two different colors of said back contact solar cells.

16. The color cell assembly of claim 1, wherein said back sheet is a color back sheet having a color consistent with a color of said color back contact solar cell.

17. A photovoltaic system comprising the color cell assembly of any one of claims 1-16.

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