Light conversion glass matched with heterojunction battery assembly and photovoltaic heterojunction battery assembly

Abstract

The invention provides light conversion glass matched with a heterojunction battery assembly and a photovoltaic heterojunction battery assembly, the light conversion glass comprises a glass body, the glass body is provided with a light conversion film, the light conversion film is prepared from glass coating liquid and a light conversion agent, and the reflectivity of the light conversion glass is basically equal to that of conventional coated glass. The power quality guarantee of a photovoltaic heterojunction battery assembly adopting the light conversion glass is prolonged by about 5 years, the power can be improved by about 1.3%, and the manufacturing cost is reduced by about 3 minutes per watt (namely 310,000,000 yuan / GW).

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic modules, and particularly to a light conversion glass for matching heterojunction battery modules and a photovoltaic heterojunction battery module. Background Art

[0002] Photovoltaic heterojunction (abbreviation: HJT) battery modules have the advantages of high conversion efficiency, short process flow, no LID effect and PID attenuation, and high bifaciality, and have always been a research hotspot in recent years. The photovoltaic HJT battery module is mainly composed of a glass before coating, an encapsulant, an HJT cell, an encapsulant, and a glass after embossing, which are sequentially arranged from top to bottom. Due to the special structure of the HJT cell, the light-induced degradation effect (also known as the Steabler-Wronski effect) is likely to occur. The ultraviolet light of the HJT cell passes through the TCO and the N layer to reach between the i layer and the silicon wafer. High-energy UV (wavelength < 353 nm) will break the Si-H bond (after the HJT cell is passivated, H combines with the dangling bond to form a saturated bond, that is, the Si-H bond), resulting in an increase in the surface defect density. At the same time, the carriers in Si are excited by UV to the conduction band of SiO 2 causing an increase in the Si-SiO 2 interface states and an increase in the surface recombination rate (recombination occurs between the H bonds between the i layer and the silicon wafer). During long-term outdoor use, the attenuation of the battery efficiency caused by ultraviolet light can reach 0.2% - 0.5%, which seriously affects the power generation of the HJT battery.

[0003] At present, high-cutoff encapsulants are generally used in the photovoltaic industry to intercept ultraviolet light. Although the use of high-cutoff encapsulants can effectively solve the efficiency attenuation caused by ultraviolet light, it will also cause the factory power of HJT products to drop by about 1.3%, affecting the economic benefits of HJT manufacturers and the power generation of the power station end and system end. In the prior art, light conversion agents are also added to the encapsulant to intercept ultraviolet light, but this kind of encapsulant has poor reliability, and at the same time, there are many lamination bubbles in the production process, resulting in a low product yield.

[0004] In the present invention, the light conversion agent is added to the glass coating solution, which can not only achieve the function of the light conversion encapsulant, but also solve the problems of the reliability of the light conversion encapsulant and lamination bubbles, thereby improving the product yield. However, when adding the light conversion agent to the glass coating solution, there are still the following problems: After multiple tests, it is found that after adding the light conversion agent, the reflectivity of the glass surface increases, resulting in a decrease in the solar transmittance. The average reflectivity of the conventional coated glass (the glass coating solution does not add the light conversion agent) is about 10.5%, and the average reflectivity after adding the light conversion agent is about 14.5%, thereby greatly reducing the power and power generation of the photovoltaic module. Summary of the Invention

[0005] The present invention provides a light conversion glass for matching a heterojunction battery module and a photovoltaic heterojunction battery module. The reflectivity of the light conversion glass is basically the same as that of a conventional coated glass. The power quality guarantee of the photovoltaic heterojunction battery module can be extended by about 5 years, the power can be increased by about 1.3%, and the manufacturing cost can be reduced by about 3 cents per watt (i.e., 30 million yuan per GW).

[0006] The technical solution of the present invention is realized as follows: A light conversion glass for matching a heterojunction battery module includes a glass body, and a light conversion film is provided on the glass body. The light conversion film is prepared from raw materials with the following mass percentages: 90%-99% of a glass coating solution and 1%-10% of a light conversion agent.

[0007] Further, the light conversion film is prepared from raw materials with the following mass percentages: 96%-98% of a glass coating solution and 2%-4% of a light conversion agent.

[0008] Further, the glass coating solution includes a silane coupling agent, nano-silica, ethanol, deionized water, and a light antireflection agent. The mass ratio of the silane coupling agent, nano-silica, ethanol, deionized water, light antireflection agent, and light conversion agent is (3.8-4.1):(1.1-1.3):(4.0-4.2):0.5:(1.04-1.25):(0.31-0.36).

[0009] Further, the preparation method of the light conversion glass includes the following steps: The light conversion agent and the glass coating solution are stirred evenly, and then coated on the glass body to form a light conversion film, obtaining the light conversion glass.

[0010] Further, the thickness of the light conversion film is 100-140 mm.

[0011] A photovoltaic heterojunction battery module includes the above-mentioned light conversion glass, and the light conversion glass can be used as the front glass and / or the embossed rear glass of the photovoltaic heterojunction battery module.

[0012] The beneficial effects of the present invention:

[0013] The present invention simultaneously achieves the functions of intercepting ultraviolet light and improving the power of a photovoltaic HJT battery module by adding a light conversion agent to the glass coating solution. By adding the light conversion agent, the ultraviolet light in sunlight is converted into blue light. At the same time, through the adjustment of the light conversion film formula, the reflectivity of the glass is reduced, making the reflectivity of the light conversion glass basically the same as that of a conventional coated glass, thereby ensuring the improvement of the test power of the photovoltaic HJT battery module.

[0014] The present invention can effectively solve the problem of efficiency degradation of photovoltaic HJT cell modules caused by ultraviolet light during long-term outdoor use; extend the power quality guarantee of photovoltaic HJT cell modules. Currently, the longest power quality guarantee for HJT products is 30 years. After being paired with light-converting glass, the efficiency degradation of the cell wafers is less than 0.15% within 10 years, and the power quality guarantee can be extended to about 35 years; the power of photovoltaic HJT cell modules can be increased by about 1.3%, the manufacturing cost can be reduced by about 3 cents per watt (i.e., 30 million yuan per GW), the cost per kilowatt-hour of photovoltaic products can be reduced, and the investment return rate can be improved. Detailed implementation manners

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] The light-converting agent in the embodiments of the present invention is purchased from Nitto Denko Corporation, and the light anti-reflection agent is purchased from Shanghai Shangruige Plastics Co., Ltd., with the model AR76.

[0017] Embodiment 1

[0018] A light-converting glass for matching a heterojunction cell module, comprising a glass body, on which a light-converting film is provided. The light-converting film comprises a glass coating solution and a light-converting agent. The glass coating solution comprises a silane coupling agent, nano-silica, ethanol, deionized water and a light anti-reflection agent. The mass ratio of the silane coupling agent, nano-silica, ethanol, deionized water, light anti-reflection agent and light-converting agent is 4.1:1.3:4.1:0.5:1.25:0.31.

[0019] The preparation method of the light-converting glass comprises the following steps: uniformly stirring the light-converting agent and the glass coating solution, and then coating the upper surface of the glass body to form a light-converting film, thereby obtaining the light-converting glass. The thickness of the light-converting film is 140 mm.

[0020] Embodiment 2

[0021] A light-converting glass for matching a heterojunction cell module, comprising a glass body, on which a light-converting film is provided. The light-converting film comprises a silane coupling agent, nano-silica, ethanol, deionized water and a light-converting agent. The mass ratio of the silane coupling agent, nano-silica, ethanol, deionized water, light anti-reflection agent and light-converting agent is 3.8:1.1:4.0:0.5:1.1:0.36.

[0022] The preparation method of the light-converting glass comprises the following steps: uniformly stirring the light-converting agent and the glass coating solution, and then coating the upper surface of the glass body to form a light-converting film, thereby obtaining the light-converting glass. The thickness of the light-converting film is 100 mm.

[0023] Example 3

[0024] A light conversion glass for matching a heterojunction battery component, comprising a glass body, on which a light conversion film is provided. The light conversion film comprises a glass coating solution and a light conversion agent. The glass coating solution comprises a silane coupling agent, nano-silica, ethanol and deionized water. The mass ratio of the silane coupling agent, nano-silica, ethanol, deionized water, light antireflection agent and light conversion agent is 4:1.2:4.2:0.5:1.18:0.36.

[0025] A preparation method of the light conversion glass comprises the following steps: uniformly stirring the light conversion agent and the glass coating solution, and then coating the upper surface of the glass body to form a light conversion film, thereby obtaining the light conversion glass. The thickness of the light conversion film is 120 mm.

[0026] Comparative Example 1

[0027] This example is basically the same as Example 3, except that the mass ratio of the silane coupling agent, nano-silica, ethanol, deionized water and light antireflection agent is 4:1:4.2:0.5:0.3.

[0028] Coat the glass coating solution prepared in Comparative Example 1 on the upper surface of the glass body to obtain a conventional coated glass.

[0029] Comparative Example 2

[0030] This example is basically the same as Example 3, except that the mass ratio of the silane coupling agent, nano-silica, ethanol, deionized water, light antireflection agent and light conversion agent is 3.8:1.1:4.0:0.3:1.1:0.41.

[0031] Perform reflectivity tests (GB / T30984.3-2016) on the light conversion glasses prepared in Example 3, Comparative Example 1 and Comparative Example 2.

[0032] Use the light conversion glasses prepared in Example 3, Comparative Example 1 and Comparative Example 2 as the front glass and the embossed back glass of a photovoltaic HJT battery component, and test the power of the photovoltaic HJT battery component (the cell size is 210*105 mm, the component is a 132 double-glass version, and the test method is IEC60904). The results are shown in the following table.

[0033] Reflectivity of light conversion glass Power of photovoltaic HJT cell module / W Example 3 10.49％ 710.5 Comparative Example 1 10.6％ 701.4 Comparative Example 2 14.87％ 705.8

[0034] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. The light conversion glass for matching a heterojunction battery component includes a glass body. It is characterized in that: A light conversion film is provided on the glass body, and the light conversion film is prepared from raw materials in the following mass percentages: 90%-99% of a glass coating solution and 1%-10% of a light conversion agent.

2. The light conversion glass for matching a heterojunction battery component according to claim 1. It is characterized in that: The light conversion film is prepared from raw materials in the following mass percentages: 96%-98% of a glass coating solution and 2%-4% of a light conversion agent.

3. The light conversion glass for matching a heterojunction battery component according to claim 1 or 2. It is characterized in that: The glass coating solution includes a silane coupling agent, nano-silica, ethanol, deionized water, and a light antireflection agent. The mass ratio of the silane coupling agent, nano-silica, ethanol, deionized water, light antireflection agent, and light conversion agent is (3.8-4.1):(1.1-1.3):(4.0-4.2):0.5:(1.04-1.25):(0.31-0.36).

4. The light conversion glass for matching a heterojunction battery component according to claim 1. It is characterized in that: The preparation method of the light conversion glass includes the following steps: uniformly stirring the light conversion agent and the glass coating solution, and then coating the mixture on the glass body to form a light conversion film, thereby obtaining the light conversion glass.

5. The light conversion glass for matching a heterojunction battery component according to claim 1. It is characterized in that: The thickness of the light conversion film is 100-140 mm.

6. A photovoltaic heterojunction battery component. It is characterized in that it includes the light conversion glass according to any one of claims 1-5.