Design method and system for high-conversion-rate packaging material of HJT battery assembly

Abstract

The invention provides a design method and system for a high-conversion-rate packaging material of an HJT battery assembly, and the method comprises the steps: plating a first antireflection film on the surface of photovoltaic glass, and adding a light conversion substance into the first antireflection film; detecting a plurality of antireflection parameters of the first antireflection film added with the light conversion substance, and adjusting the content of the light conversion substance in the first antireflection film in combination with the plurality of antireflection parameters and a light transmission detection result of the first antireflection film so as to generate a first light conversion antireflection film; plating a second anti-reflection film on the first light conversion anti-reflection film, and adding a corresponding number of light conversion substances into the second anti-reflection film according to a light conversion detection result of the first light conversion anti-reflection film and a preset light conversion effect to generate the second light conversion anti-reflection film; and according to the light transmission effects of the first light conversion antireflection film and the second light conversion antireflection film, setting parameters of the reflective backboard of the HJT battery assembly. According to the method, on the basis of ensuring the photoelectric conversion efficiency of the HJT battery assembly, the cost consumed by light conversion of the packaging material is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of solar cell manufacturing, and in particular to a design method and system for a high conversion rate packaging material for an HJT battery assembly. Background Art

[0002] At present, the popularity of solar cells as a green energy source in various fields is gradually increasing. Among various types of solar cells, intrinsic thin-film heterojunction cells (Heterojunction Technology, referred to as HJT) have better application prospects due to their simple structure, low process temperature, high open circuit voltage and double-sided power generation.

[0003] Among them, the packaging material of the HJT battery assembly is an important component of the battery assembly. It can not only effectively protect the HJT battery, but also improve the photoelectric conversion efficiency of the HJT battery, thereby improving the battery's power generation capacity and other effects.

[0004] In the related art, in order to achieve the photoelectric conversion effect of the battery module packaging material, light-converting substances are usually added to the photovoltaic film of the module. However, in practical applications, the packaging materials designed in the above related art require high material costs and have limited effect on improving the photoelectric conversion efficiency. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the first purpose of the present application is to propose a design method for a high conversion rate packaging material for an HJT battery assembly, which reduces the cost of converting light using packaging materials while ensuring the photoelectric conversion efficiency of the HJT battery assembly.

[0007] The second object of the present application is to propose a design system for high conversion rate packaging materials of HJT battery components;

[0008] A third object of the present application is to provide a non-transitory computer-readable storage medium.

[0009] To achieve the above-mentioned purpose, the first aspect of the present application is to propose a design method for a high conversion rate packaging material of a HJT battery assembly, the method comprising the following steps:

[0010] A first anti-reflection film is coated on the photovoltaic glass surface of the HJT cell by an anti-reflection coating process, and a light-converting substance is added to the first anti-reflection film, wherein the light-converting substance is used to convert short-wavelength light into long-wavelength light that can be absorbed by the HJT cell;

[0011] Detecting a plurality of anti-reflection parameters of the first anti-reflection film after adding the light-converting substance, and adjusting the content of the light-converting substance added to the first anti-reflection film in combination with the plurality of anti-reflection parameters and the transmittance detection result of the first anti-reflection film to generate the first light-converting anti-reflection film;

[0012] A second anti-reflection film is plated on the first light-converting anti-reflection film, and a corresponding amount of light-converting material is added to the second anti-reflection film according to a light-converting detection result of the first light-converting anti-reflection film and a preset light-converting effect, so as to generate a second light-converting anti-reflection film;

[0013] The parameters of the reflective backplane of the HJT battery assembly are set according to the transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

[0014] Optionally, in one embodiment of the present application, the multiple anti-reflection parameters include: a film layer refractive index, a film layer thickness and a particle structure on a film layer surface, and the adjustment of the content of the light-converting substance added to the first anti-reflection film includes: based on the refractive index of the first anti-reflection film and the refractive index of the light-converting substance, detecting the film layer refractive index of the first anti-reflection film after adding the light-converting substance, and calculating the target refractive index of the first light-converting anti-reflection film according to the refractive index of air and the refractive index of the photovoltaic glass; adjusting the content of the light-converting substance added to the first anti-reflection film with the refractive index of the film layer approaching the target refractive index as the first goal.

[0015] Optionally, in one embodiment of the present application, the adjusting the content of the light conversion substance added to the first anti-reflection film also includes: detecting the current film thickness of the first anti-reflection film after the light conversion substance is added, and obtaining the spectral characteristics of the HJT battery; determining the target film thickness of the first light conversion anti-reflection film according to the spectral characteristics and the center wavelength of visible light; and adjusting the content of the light conversion substance added to the first anti-reflection film with the second goal of making the current film thickness approach the target film thickness.

[0016] Optionally, in one embodiment of the present application, the adjustment of the content of the light-converting substance added to the first anti-reflection film further includes: determining the light-shielding condition of the particulate matter based on the particle structure on the surface of the film layer of the first anti-reflection film after the light-converting substance is added; and removing a corresponding amount of the light-converting substance located on the surface of the film layer of the first anti-reflection film with the third goal of reducing the light-shielding area of ​​the particulate matter.

[0017] Optionally, in one embodiment of the present application, after adding a corresponding amount of light-converting substance to the second anti-reflection film, it also includes: detecting multiple anti-reflection parameters and transmittance of the second anti-reflection film after adding the light-converting substance, and detecting the light-converting effect of the second anti-reflection film after adding the light-converting substance; adjusting the content of the light-converting substance added to the second anti-reflection film in combination with the preset light-converting effect and the multiple anti-reflection parameters, transmittance and light-converting effect of the second anti-reflection film after adding the light-converting substance.

[0018] Optionally, in one embodiment of the present application, the parameters of setting the reflective backplane of the HJT battery assembly include: setting the constituent materials and surface structure of the reflective backplane according to the overall transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

[0019] To achieve the above-mentioned purpose, the second aspect of the present application further proposes a design system for high conversion rate packaging materials of HJT battery components, comprising the following modules:

[0020] A first coating module is used to coat a first anti-reflection film on the photovoltaic glass surface of the HJT cell through an anti-reflection coating process, and add a light conversion substance to the first anti-reflection film, wherein the light conversion substance is used to convert short-wavelength light into long-wavelength light that can be absorbed by the HJT cell;

[0021] An adjustment module, configured to detect a plurality of anti-reflection parameters of the first anti-reflection film after adding the light-converting substance, and adjust the content of the light-converting substance added to the first anti-reflection film in combination with the plurality of anti-reflection parameters and the transmittance detection result of the first anti-reflection film to generate the first light-converting anti-reflection film;

[0022] A second coating module is used to coat a second anti-reflection film on the first light-converting anti-reflection film, and add a corresponding amount of light-converting material to the second anti-reflection film according to the light-converting detection result of the first light-converting anti-reflection film and a preset light-converting effect, so as to generate the second light-converting anti-reflection film;

[0023] A setting module is used to set the parameters of the reflective backplane of the HJT battery assembly according to the transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

[0024] In order to implement the above-mentioned embodiments, the third aspect embodiment of the present application also proposes a non-temporary computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the design method of the high conversion rate packaging material of the HJT battery component in the above-mentioned first aspect is implemented.

[0025] The technical solution provided by the embodiment of the present application brings at least the following beneficial effects: the present application firstly coats the first anti-reflection film on the photovoltaic glass surface of the HJT cell through the anti-reflection coating process, and adds a light-converting substance to the first anti-reflection film; then detects multiple anti-reflection parameters of the first anti-reflection film after adding the light-converting substance, and adjusts the content of the light-converting substance added to the first anti-reflection film in combination with the multiple anti-reflection parameters and the transmittance detection results; then coats the second anti-reflection film on the first light-converting anti-reflection film, and according to the light-converting detection results of the first light-converting anti-reflection film and the preset light-converting effect, adds a corresponding amount of light-converting substance to the second anti-reflection film; finally, according to the transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film, sets the parameters of the reflective backplane of the HJT cell assembly. Thus, the present application adds the light-converting substance that performs the light-converting effect to the double-layer coating of the photovoltaic glass. Since the thickness of the anti-reflection film of the photovoltaic glass is much smaller than that of the photovoltaic adhesive film, compared with adding the light-converting substance to the photovoltaic adhesive film, the present application significantly reduces the consumption of the light-converting substance and reduces the cost of the packaging material. In addition, the present application improves the light transmittance of the HJT battery assembly through double-layer coating, and reasonably sets the amount of light conversion material added to the anti-reflection film on the basis of ensuring the light transmittance of each layer of anti-reflection film as much as possible, thereby reducing the influence of the added light conversion material on the light transmittance of the anti-reflection film, and taking into account the light transmittance and light conversion efficiency of each layer of anti-reflection film. Therefore, the present application reduces the cost of light conversion of packaging materials on the basis of ensuring the photoelectric conversion efficiency of the HJT battery assembly.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0028] Figure 1 A flow chart of a design method for a high conversion rate packaging material for a HJT battery assembly proposed in an embodiment of the present application;

[0029] Figure 2 A flow chart of a method for adjusting the content of a light-converting substance proposed in an embodiment of the present application;

[0030] Figure 3 A flow chart of another method for adjusting the content of light-converting substances proposed in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of the structure of a design system for a high conversion rate packaging material for an HJT battery assembly proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] The following describes a design method and system for a high conversion rate packaging material for a HJT battery assembly proposed in an embodiment of the present invention with reference to the accompanying drawings.

[0034] Figure 1 A flow chart of a design method for a high conversion rate packaging material for a HJT battery assembly proposed in an embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0035] Step S101, coating a first anti-reflection film on the photovoltaic glass surface of the HJT cell through an anti-reflection coating process, and adding a light conversion material to the first anti-reflection film, wherein the light conversion material is used to convert short-wavelength light into long-wavelength light that can be absorbed by the HJT cell.

[0036] Specifically, based on the unique spectral response and film water vapor sensitivity of the intrinsic thin-film heterojunction HJT battery, this application improves the design of the packaging materials of the HJT battery module from three aspects: photovoltaic film, photovoltaic glass and backplane.

[0037] In order to facilitate understanding of the packaging material design method of the present application and the principle of reducing the packaging material cost compared to the prior art, the packaging materials in the related art are first described below.

[0038] Specifically, photovoltaic film, which is used to bond photovoltaic glass and cells, is an important component of photovoltaic modules and plays a key role in the performance and stability of the modules. Specifically, it includes the following points: First, the protective effect: photovoltaic film can effectively protect photovoltaic cell modules, prevent external factors such as water vapor from damaging the battery, and extend the service life of the battery. Second, the efficiency-enhancing effect: photovoltaic film can optimize the optical properties of the surface of photovoltaic cell modules and improve the photoelectric conversion efficiency. Third, the insulating effect: photovoltaic film can enhance the electrical insulation performance of photovoltaic cell modules, effectively reduce the escape of electrolytes and current leakage, and improve the stability of photovoltaic cell systems. According to different materials, photovoltaic films can be divided into three types: EVA, POE, and EPE.

[0039] Among them, the main component of EVA film is polyethylene-polyvinyl acetate copolymer, and it also includes some additives, such as cross-linking agents, thickeners, antioxidants and light stabilizers. Traditional EVA film products are transparent EVA films, which are low in cost, but the attenuation rate of the encapsulated components is high. POE film is an elastomer obtained by random copolymerization of ethylene and α-olefins (for example, 1-butene, 1-hexene or 1-octene), which is more suitable for N-type battery components. POE film has excellent water vapor barrier ability, and its water vapor permeability is only about 1 / 8 of that of EVA, which ensures the normal operation of the components in high humidity environments, but the cost is relatively high. EPE film is formed by co-extrusion and melt processing of EVA resin and POE resin, and is a multi-layer co-extruded film. Since the inner layer of EPE film is POE film, it has high anti-PID performance, and the outer layer is EVA material, which reduces the consumption of POE resin and reduces the cost of components.

[0040] Since the transparent conductive film (TCO) layer and amorphous / microcrystalline silicon film layer on the surface of the HJT battery are more sensitive to ultraviolet light, the current of the battery is lower than that of ordinary batteries. To solve this problem, the relevant technology usually adds light-converting substances to the above-mentioned photovoltaic film to convert ultraviolet light into blue light, reduce the battery's absorption of short-wavelength light (ultraviolet light), and effectively increase the power generation of the component. Compared with conventional UV cutoff films, the use of light-converting films has a greater impact on the output power of HJT battery components. This application experimentally compares the performance of conventional UV cutoff films and light-converting films, and determines that the power of heterojunction components is increased by 0.75% after the use of light-converting films.

[0041] Photovoltaic glass is an important auxiliary material for photovoltaic modules, mainly providing high light transmittance and weather protection. Photovoltaic glass contains iron elements, and generally achieves higher light transmittance by reducing the iron content; at the same time, photovoltaic glass has higher strength after tempering, which can ensure that the battery cells can withstand large temperature changes and wind pressure, and can also protect the battery cells from corrosion by rain and harmful gases in the environment. Photovoltaic glass is mainly divided into ultra-white embossed glass and ultra-white float glass according to different production processes. Among them, ultra-white embossed glass is a glass product obtained by calendering, and has a high manufacturing cost. Ultra-white float glass adopts the float process, which has the advantages of low cost and high processing yield, but its light transmittance is not as good as embossed glass.

[0042] Among them, in order to improve the light transmittance of photovoltaic glass, the relevant technology can use the anti-reflection coating process of photovoltaic glass to coat a layer of anti-reflection film on the surface of the photovoltaic glass substrate. The anti-reflection film is mainly a porous film layer composed of nano-SiO2 particles, which has good anti-reflection and light transmission effect. Then, it is sintered at high temperature to enhance the bonding strength between the film layer and the glass, enhance the strength of the glass, and at the same time improve the output power of the photovoltaic module.

[0043] Based on the above analysis, in relevant embodiments, light-converting substances are usually added to the photovoltaic film. However, since the thickness of the photovoltaic film is relatively large, which is much greater than the thickness of the anti-reflection film coated on the photovoltaic glass, more light-converting substances are required when adding light-converting substances to the photovoltaic film according to the process in the relevant technology.

[0044] To this end, the present application transfers the light conversion process of the packaging material to the anti-reflection film coated on the surface of the photovoltaic glass, that is, adding light conversion substances to the anti-reflection film. Compared with adding fluorescent materials to the photovoltaic adhesive film, the amount of fluorescent materials used can be greatly reduced.

[0045] Among them, the present application adopts a double-layer coating process for photovoltaic glass, and prepares a secondary film layer based on the primary coating, so as to further improve the power of the HJT battery module, and add light conversion materials in the double-layer coating.

[0046] In specific implementation, a first anti-reflection film is firstly plated on the photovoltaic glass surface of the HJT cell by an anti-reflection coating process, for example, a first layer of anti-reflection film is plated on the photovoltaic glass substrate surface by a roller coating process. During the coating process of the first anti-reflection film, a light-converting substance is also added to the first anti-reflection film. The light-converting substance can be added to the first anti-reflection film in different ways according to actual conditions.

[0047] As a first example, after the first anti-reflection film is plated, a corresponding amount of light-converting material can be deposited on the surface of the first anti-reflection film by chemical vapor deposition (CVD) or other methods. The light-converting material can be a luminescent material doped with rare earth elements, which is used to convert short-wavelength light into long-wavelength light that can be absorbed by the currently designed HJT battery. The added light-converting material converts the short-wavelength light (about 300 to 400nm) into relatively longer-wavelength light (about 400 to 500nm), so that the short-wavelength light near the ultraviolet can be converted into electrical energy without being cut off, giving full play to the advantages of the window layer in the microcrystalline silicon structure, while avoiding the efficiency reduction caused by ultraviolet light to the battery.

[0048] As a second example, a mixed solution containing photovoltaic glass coating liquid and light-converting substances can be coated on the surface of photovoltaic glass, and then through calcination and other processes, an anti-reflection type light-converting glass film layer can be obtained. For the light-converting substances as some down-shifting materials, relevant metal oxides can be used as raw materials, and a down-shifting material precursor solution can be prepared by adding corresponding additives; then the down-shifting material precursor solution is mixed with photovoltaic glass coating liquid and an organic solvent to obtain a mixed solution.

[0049] Step S102, detecting multiple anti-reflection parameters of the first anti-reflection film after adding the light conversion substance, combining the multiple anti-reflection parameters and the transmittance detection result of the first anti-reflection film, adjusting the content of the light conversion substance added to the first anti-reflection film to generate the first light conversion anti-reflection film.

[0050] It should be noted that since the added light-converting material, such as the down-conversion material, is usually a material with larger particles, it may block the light transmission after being added to the first anti-reflection film. For this reason, the present application combines the light transmittance requirement of the anti-reflection film and the light conversion requirement for light conversion, and adjusts the amount of the light-converting material added to the first anti-reflection film to take into account the above two requirements as much as possible.

[0051] Specifically, whether the addition of the light-converting substance will affect the anti-reflection performance of the anti-reflection film depends on the anti-reflection parameters of the first anti-reflection film after the light-converting substance is added. The anti-reflection parameters may include multiple types, such as the film refractive index, film thickness, and particle structure on the surface of the film of the anti-reflection film. The present application first detects multiple anti-reflection parameters of the anti-reflection film, and calculates whether the current anti-reflection performance of the anti-reflection film after the light-converting substance is added meets the requirements based on the multiple anti-reflection parameters. The actual transmittance of the first anti-reflection film after the light-converting substance is added is tested.

[0052] Furthermore, the content of the added light-converting substance is adjusted in combination with the above calculation results and the detection results, so that the first anti-reflection film still meets the light transmittance requirement after adding the light-converting substance. After the adjustment, a first light-converting anti-reflection film with light-converting effect and anti-reflection effect is finally generated.

[0053] As a possible implementation method, based on the anti-reflection parameters, adjustments can be made from three aspects: the refractive index of the film layer, the thickness of the film layer, and the particle structure on the surface of the film layer. The present application can be adjusted in a corresponding manner according to the process of adding the light-converting substance to the first anti-reflection film. For example, in the first example of step S101, the mass of the light-converting substance can be reduced by removing the deposited light-converting substance. For another example, in the second example, the concentration of the light-converting substance in the mixed solution can be adjusted. For another example, the present embodiment can also first test the sample, and after determining the adjusted content of the light-converting substance through this step, the first light-converting anti-reflection film is actually prepared according to the adjusted content.

[0054] In order to more clearly describe the specific implementation process of adjusting the content of the added light-converting material from the perspective of the refractive index of the film layer in the present application, an adjustment method proposed in an embodiment of the present application is exemplified below. Figure 2 This is a flow chart of a method for adjusting the content of a light-converting substance proposed in an embodiment of the present application, such as Figure 2 As shown, the method comprises the following steps:

[0055] Step S201, based on the refractive index of the first anti-reflection film and the refractive index of the light conversion material, detecting the film layer refractive index of the first anti-reflection film after adding the light conversion material, and calculating the target refractive index of the first light conversion anti-reflection film according to the refractive index of air and the refractive index of the photovoltaic glass.

[0056] Specifically, for the ideal anti-reflection performance of a single-layer anti-reflection film, the refractive index of the film layer needs to satisfy the square root of the refractive index of air and the refractive index of the glass substrate. Therefore, the present application first calculates the refractive index of the first anti-reflection film after adding the light-converting substance, or directly performs actual detection and other methods to detect the refractive index of the first anti-reflection film after adding the light-converting substance.

[0057] Then, the ideal target refractive index of the first light-converting anti-reflection film is calculated according to the refractive index of air and the refractive index of the photovoltaic glass of the HJT cell assembly.

[0058] Step S202 , adjusting the content of the light-converting material added to the first anti-reflection film with the first goal of making the film layer refractive index approach the target refractive index.

[0059] Specifically, in order to achieve the target refractive index, the content of the light-converting substance added to the first anti-reflection film is continuously adjusted so that the actual film layer refractive index approaches the target refractive index.

[0060] In order to more clearly describe the specific implementation process of adjusting the content of the added light-converting substance from the perspective of film thickness in the present application, another adjustment method proposed in an embodiment of the present application is exemplified below. Figure 3 This is a flow chart of another method for adjusting the content of light-converting substances proposed in an embodiment of the present application, such as Figure 3 As shown, the method comprises the following steps:

[0061] Step S301, detecting the current film thickness of the first anti-reflection film after adding the light conversion material, and obtaining the spectral characteristics of the HJT cell.

[0062] Specifically, the ideal anti-reflection performance of a single-layer anti-reflection film requires that the thickness of the film layer should be one-quarter of the central wavelength of visible light, and in actual production. Due to the difference in the refractive index of the photovoltaic glass film layer and the unique spectral characteristics of the HJT battery, it is also necessary to determine the thickness of the anti-reflection film that can obtain the best power gain through experiments. Therefore, the present application first detects the actual film thickness of the first anti-reflection film after adding the light-converting substance, and then obtains the spectral characteristics of the HJT battery currently being processed.

[0063] Step S302 : determining a target film thickness of the first light-converting anti-reflection film according to the spectral characteristics and the central wavelength of visible light.

[0064] As described above, the initial target film thickness is first determined according to the central wavelength of visible light, and then adjusted in combination with the spectral characteristics of the HJT cell to determine the ideal target film thickness of the first light conversion anti-reflection film.

[0065] Step S303 , adjusting the content of the light-converting material added to the first anti-reflection film with the second goal of making the current film thickness approach the target film thickness.

[0066] Specifically, with the goal of achieving a target film thickness, the content of the light-converting substance added to the first anti-reflection film is continuously adjusted so that the actual film thickness approaches the target film thickness.

[0067] It should be noted that the embodiments of the present application can take multiple objectives into consideration during the adjustment process. For example, when the first objective and the second objective are met at the same time, the anti-reflection film can achieve better anti-reflection performance. If the peak value of the transmittance curve of the photovoltaic glass is between 550 and 650 nm, then the corresponding optimal film thickness is about 110 to 130 nm.

[0068] In one embodiment of the present application, adjusting the content of the light-converting substance added to the first anti-reflection film also includes: determining the light-shielding condition of the particles based on the particle structure on the surface of the film layer of the first anti-reflection film after the light-converting substance is added; and removing a corresponding amount of the light-converting substance located on the surface of the film layer of the first anti-reflection film with the third goal of reducing the light-shielding area of ​​the particles.

[0069] For example, most down-conversion materials are mainly particles, and directly adding them to the surface of the anti-reflection film may cause shading effects. Therefore, the surface structure of the film layer will also affect the anti-reflection performance. In this embodiment, for the addition process in the first example of step S101, the particle distribution on the surface of the film layer of the first anti-reflection film and the overall shading area and other shading conditions can be detected by image detection technology and other methods. Then, with the goal of reducing the shading area of ​​the particles on the surface of the film layer, the corresponding amount of light-converting substances on the surface of the film layer are removed.

[0070] Therefore, the present application adjusts the content of the light-converting substance added to the first anti-reflection film in a variety of ways, so as to ensure the light transmittance of the first anti-reflection film to the greatest extent.

[0071] Step S103, coating a second anti-reflection film on the first light-converting anti-reflection film, and adding a corresponding amount of light-converting material to the second anti-reflection film according to the light-converting detection result of the first light-converting anti-reflection film and the preset light-converting effect, so as to generate the second light-converting anti-reflection film.

[0072] Specifically, in accordance with the method of coating the first anti-reflection film in step S102, the second anti-reflection film is continuously coated on the first light-converting anti-reflection film, and a light-converting substance is also added to the second anti-reflection film. Among them, since the content of the light-converting substance added to the first anti-reflection film is adjusted, the light-converting effect (i.e., light-converting rate, etc.) of the first light-converting anti-reflection film may not meet the final light-converting requirements. Therefore, this step actually detects the light-converting rate of the first light-converting anti-reflection film, and according to the light-converting rate obtained by the detection and the preset light-converting effect (i.e., the expected final overall light-converting rate of the HJT battery assembly), a corresponding amount of light-converting substance is added to the second anti-reflection film to meet the preset light-converting effect requirements.

[0073] In one embodiment of the present application, after adding a corresponding amount of light-converting substance to the second anti-reflection film, it also includes: detecting multiple anti-reflection parameters and transmittance of the second anti-reflection film after adding the light-converting substance, and detecting the light-converting effect of the second anti-reflection film after adding the light-converting substance; adjusting the content of the light-converting substance added to the second anti-reflection film in combination with the preset light-converting effect and the multiple anti-reflection parameters, transmittance and light-converting effect of the second anti-reflection film after adding the light-converting substance.

[0074] Specifically, on the basis of satisfying the preset light conversion effect, this embodiment can also take into account the demand for the transmittance of the second anti-reflection film, and adjust the content of the light conversion substance added to the second anti-reflection film in combination with the multiple anti-reflection parameters and light conversion effect of the second anti-reflection film, so that each anti-reflection parameter of the adjusted second anti-reflection film reaches the ideal target anti-reflection parameter value, and the overall light conversion rate of the battery assembly after passing through the first anti-reflection film and the second anti-reflection film reaches the expected light conversion effect. Among them, the specific adjustment method of the content of the light conversion substance can refer to the relevant adjustment method in step S102, which will not be repeated here.

[0075] Therefore, the present application improves the light transmittance of the HJT battery module by converting light in the double-coated glass, which can be increased by about 0.6% compared to the light transmittance of the single-glass module, and achieves the light conversion effect, which is beneficial to improving the power of the HJT battery module. In addition, the thickness of the double-layer anti-reflection film is less than that of the photovoltaic film. The present application also adjusts the content of the added light conversion material through multiple steps, which can further reduce the amount of light conversion material used.

[0076] Step S104, setting the parameters of the reflective backplane of the HJT battery assembly according to the transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

[0077] Specifically, since the HJT battery module is a double-sided structure, both the front and back sides can receive light to generate electricity. The present application sets a reflective backplane to improve the photoelectric conversion efficiency of the module. The reflective backplane can reflect the light passing through the back side of the battery module, thereby increasing the absorption of light by the battery and improving the power output of the module. In specific implementation, since the material selection and surface treatment process of the reflective backplane have a direct impact on its reflective performance, in one embodiment of the present application, the constituent material of the reflective backplane and the surface structure of the backplane can be adjusted according to the overall transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

[0078] For example, if the overall transmittance is low, the backplane surface may be specially treated to increase its reflectivity by increasing the area of ​​the reflective surface, or using materials with high reflective properties, such as high reflective polymer materials or metal materials. When the overall transmittance is less than a certain value, the material of the reflective backplane is reduced accordingly, so as to reduce the material consumption of the reflective backplane while maximizing the reflection efficiency.

[0079] In summary, the design method of the high conversion rate packaging material of the HJT battery assembly of the embodiment of the present application is to first coat the first anti-reflection film on the photovoltaic glass surface of the HJT battery through the anti-reflection coating process, and add a light-converting substance to the first anti-reflection film; then detect multiple anti-reflection parameters of the first anti-reflection film after adding the light-converting substance, and adjust the content of the light-converting substance added to the first anti-reflection film in combination with the multiple anti-reflection parameters and the transmittance detection results; then coat the second anti-reflection film on the first light-converting anti-reflection film, and add a corresponding amount of light-converting substance to the second anti-reflection film according to the light-converting detection results of the first light-converting anti-reflection film and the preset light-converting effect; finally, according to the transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film, set the parameters of the reflective backplane of the HJT battery assembly. Thus, the method adds the light-converting substance that performs the light-converting effect to the double-layer coating of the photovoltaic glass. Since the thickness of the anti-reflection film of the photovoltaic glass is much smaller than that of the photovoltaic adhesive film, compared with adding the light-converting substance to the photovoltaic adhesive film, the present application significantly reduces the consumption of the light-converting substance and reduces the cost of the packaging material. In addition, the method improves the light transmittance of the HJT battery module through double-layer coating, and reasonably sets the amount of light conversion material added to the anti-reflection film on the basis of ensuring the light transmittance of each layer of anti-reflection film as much as possible, thereby reducing the influence of the added light conversion material on the light transmittance of the anti-reflection film, and taking into account the light transmittance and light conversion efficiency of each layer of anti-reflection film. Therefore, the method reduces the cost of light conversion of packaging materials on the basis of ensuring the photoelectric conversion efficiency of the HJT battery module.

[0080] In order to realize the above-mentioned embodiment, the present application also proposes a design system for a high conversion rate packaging material of a HJT battery assembly. Figure 4A schematic diagram of a design system for a high conversion rate packaging material for a HJT battery assembly proposed in an embodiment of the present application is shown in FIG. Figure 4 As shown, the system includes: a first plating module 100 , an adjustment module 200 , a second plating module 300 and a setting module 400 .

[0081] Among them, the first coating module 100 is used to coat the first anti-reflection film on the photovoltaic glass surface of the HJT cell through an anti-reflection coating process, and add a light-converting substance to the first anti-reflection film, wherein the light-converting substance is used to convert short-wavelength light into long-wavelength light that can be absorbed by the HJT cell.

[0082] The adjustment module 200 is used to detect multiple anti-reflection parameters of the first anti-reflection film after adding the light conversion material, and adjust the content of the light conversion material added to the first anti-reflection film based on the multiple anti-reflection parameters and the transmittance detection result of the first anti-reflection film to generate the first light conversion anti-reflection film.

[0083] The second coating module 300 is used to coat a second anti-reflection film on the first light-converting anti-reflection film, and add a corresponding amount of light-converting material to the second anti-reflection film according to the light-converting detection result of the first light-converting anti-reflection film and the preset light-converting effect, so as to generate the second light-converting anti-reflection film.

[0084] The setting module 400 is used to set the parameters of the reflective backplane of the HJT battery assembly according to the transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

[0085] Optionally, in one embodiment of the present application, the adjustment module 200 is specifically used to: detect the refractive index of the film layer of the first anti-reflection film after adding the light converting substance based on the refractive index of the first anti-reflection film and the refractive index of the light converting substance, and calculate the target refractive index of the first light converting anti-reflection film according to the refractive index of air and the refractive index of the photovoltaic glass; adjust the content of the light converting substance added to the first anti-reflection film with the refractive index of the film layer approaching the target refractive index as the first goal.

[0086] Optionally, in one embodiment of the present application, the adjustment module 200 is specifically used to: detect the current film thickness of the first anti-reflection film after the light conversion substance is added, and obtain the spectral characteristics of the HJT battery; determine the target film thickness of the first light conversion anti-reflection film according to the spectral characteristics and the central wavelength of visible light; and adjust the content of the light conversion substance added to the first anti-reflection film with the second goal of making the current film thickness approach the target film thickness.

[0087] Optionally, in one embodiment of the present application, the adjustment module 200 is specifically used to: determine the light shielding condition of the particles according to the particle structure on the film surface of the first anti-reflection film after adding the light-converting substance; and remove the corresponding amount of light-converting substance on the film surface of the first anti-reflection film with the third goal of reducing the light-converting area of ​​the particles.

[0088] Optionally, in one embodiment of the present application, the system also includes a second adjustment module, which is specifically used to: detect multiple anti-reflection parameters and transmittance of the second anti-reflection film after adding the light conversion substance, and detect the light conversion effect of the second anti-reflection film after adding the light conversion substance; adjust the content of the light conversion substance added to the second anti-reflection film in combination with the preset light conversion effect and the multiple anti-reflection parameters, transmittance and light conversion effect of the second anti-reflection film after adding the light conversion substance.

[0089] Optionally, in one embodiment of the present application, a module 400 is provided, specifically for: setting the constituent material and surface structure of the reflective back plate according to the overall light transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

[0090] It should be noted that the aforementioned explanation of the embodiment of the design method of the high conversion rate packaging material of the HJT battery assembly is also applicable to the system of this embodiment and will not be repeated here.

[0091] In summary, the design system of the high conversion rate packaging material of the HJT battery module in the embodiment of the present application adds the light conversion substance that performs the light conversion effect to the double-layer coating of the photovoltaic glass. Since the thickness of the anti-reflection film of the photovoltaic glass is much smaller than the photovoltaic film, compared with adding the light conversion substance in the photovoltaic film, the present application significantly reduces the consumption of the light conversion substance and reduces the cost of the packaging material. In addition, the system improves the transmittance of the HJT battery module through the double-layer coating. On the basis of ensuring the transmittance of each layer of the anti-reflection film as much as possible, the amount of light conversion substance added to the anti-reflection film is reasonably set, thereby reducing the influence of the added light conversion substance on the transmittance of the anti-reflection film, and taking into account the transmittance and light conversion efficiency of each layer of the anti-reflection film. Therefore, the system reduces the cost of light conversion of the packaging material on the basis of ensuring the photoelectric conversion efficiency of the HJT battery module.

[0092] In order to implement the above-mentioned embodiments, the present application also proposes a non-temporary computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, it implements the design method of high conversion rate packaging material of HJT battery components as described in any one of the above-mentioned first aspect embodiments.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0094] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0095] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0096] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0097] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0098] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0099] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0100] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A design method for a high conversion rate packaging material for a HJT battery assembly, characterized in that: The following steps are involved: A first anti-reflection film is coated on the photovoltaic glass surface of the HJT cell by an anti-reflection coating process, and a light-converting substance is added to the first anti-reflection film, wherein the light-converting substance is used to convert short-wavelength light into long-wavelength light that can be absorbed by the HJT cell; Detecting a plurality of anti-reflection parameters of the first anti-reflection film after adding the light-converting substance, and adjusting the content of the light-converting substance added to the first anti-reflection film in combination with the plurality of anti-reflection parameters and the transmittance detection result of the first anti-reflection film to generate the first light-converting anti-reflection film; A second anti-reflection film is plated on the first light-converting anti-reflection film, and a corresponding amount of light-converting material is added to the second anti-reflection film according to a light-converting detection result of the first light-converting anti-reflection film and a preset light-converting effect, so as to generate a second light-converting anti-reflection film; The parameters of the reflective backplane of the HJT battery assembly are set according to the transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

2. The design method according to claim 1, characterized in that: The multiple anti-reflection parameters include: film layer refractive index, film layer thickness and particle structure on the film layer surface, and the adjusting the content of the light-converting substance added to the first anti-reflection film includes: Based on the refractive index of the first anti-reflection film and the refractive index of the light conversion material, the refractive index of the film layer of the first anti-reflection film after the light conversion material is added is detected, and according to the refractive index of air and the refractive index of the photovoltaic glass, the target refractive index of the first light conversion anti-reflection film is calculated; With the first goal of making the refractive index of the film layer approach the target refractive index, the content of the light-converting material added to the first anti-reflection film is adjusted.

3. The design method according to claim 2, characterized in that: The adjusting the content of the light conversion substance added to the first anti-reflection film further includes: Detecting the current film thickness of the first anti-reflection film after adding the light conversion material, and obtaining the spectral characteristics of the HJT battery; Determining a target film thickness of the first light-converting anti-reflection film according to the spectral characteristics and the central wavelength of visible light; With the second goal of making the current film thickness approach the target film thickness, the content of the light-converting material added to the first anti-reflection film is adjusted.

4. The design method according to claim 2, characterized in that: The adjusting the content of the light conversion substance added to the first anti-reflection film further includes: Determining the light-shielding condition of the particles according to the particle structure on the film surface of the first anti-reflection film after the light-converting substance is added; With the third goal of reducing the light-shielding area of ​​the particles, a corresponding amount of light-converting material located on the surface of the first anti-reflection film is removed.

5. The design method according to claim 1, characterized in that: After adding a corresponding amount of light-converting material to the second anti-reflection film, the method further includes: Detecting a plurality of anti-reflection parameters and transmittance of the second anti-reflection film after adding the light-converting substance, and detecting the light-converting effect of the second anti-reflection film after adding the light-converting substance; The content of the light conversion substance added to the second anti-reflection film is adjusted in combination with the preset light conversion effect and the multiple anti-reflection parameters, light transmittance and light conversion effect of the second anti-reflection film after adding the light conversion substance.

6. The design method according to claim 1, characterized in that: The parameters of setting the reflective backplane of the HJT battery assembly include: The constituent material and surface structure of the reflective backplane are set according to the overall light transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

7. A design system for high conversion rate packaging materials of HJT battery components, characterized in that: include: A first coating module is used to coat a first anti-reflection film on the photovoltaic glass surface of the HJT cell through an anti-reflection coating process, and add a light conversion substance to the first anti-reflection film, wherein the light conversion substance is used to convert short-wavelength light into long-wavelength light that can be absorbed by the HJT cell; An adjustment module, configured to detect a plurality of anti-reflection parameters of the first anti-reflection film after adding the light-converting substance, and adjust the content of the light-converting substance added to the first anti-reflection film in combination with the plurality of anti-reflection parameters and the transmittance detection result of the first anti-reflection film to generate the first light-converting anti-reflection film; A second coating module is used to coat a second anti-reflection film on the first light-converting anti-reflection film, and add a corresponding amount of light-converting material to the second anti-reflection film according to the light-converting detection result of the first light-converting anti-reflection film and a preset light-converting effect, so as to generate the second light-converting anti-reflection film; A setting module is used to set the parameters of the reflective backplane of the HJT battery assembly according to the transmittance of the first light-converting anti-reflection film and the second light-converting anti-reflection film.

8. The design system according to claim 7, characterized in that: The adjustment module is specifically used for: Based on the refractive index of the first anti-reflection film and the refractive index of the light conversion material, the refractive index of the film layer of the first anti-reflection film after the light conversion material is added is detected, and according to the refractive index of air and the refractive index of the photovoltaic glass, the target refractive index of the first light conversion anti-reflection film is calculated; With the first goal of making the refractive index of the film layer approach the target refractive index, the content of the light-converting material added to the first anti-reflection film is adjusted.

9. The design system according to claim 8, characterized in that: The adjustment module is specifically used for: Detecting the current film thickness of the first anti-reflection film after adding the light conversion material, and obtaining the spectral characteristics of the HJT battery; Determining a target film thickness of the first light-converting anti-reflection film according to the spectral characteristics and the central wavelength of visible light; With the second goal of making the current film thickness approach the target film thickness, the content of the light-converting material added to the first anti-reflection film is adjusted.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for designing a high conversion rate packaging material for a HJT battery assembly according to any one of claims 1 to 6 is implemented.

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