 |
The main material composition of solar module
Backplanes, EVA, ribbons, cells, glass, silicone, aluminum, junction boxes.
Tempered glass
1. It mainly supports the entire assembly and provides sufficient mechanical strength for the assembly, usually with a thickness of 3.2mm.
2. Tempered glass used in the solar industry requires no more than 0.01% iron.
3. Transmittance: The light transmittance in the spectral range of 400 nm to 1100 nm is required to be 91% or more.
4. Wind pressure resistance performance: The wind pressure resistance performance is required to be greater than 2400 Pa (equivalent to wind pressure of 800 Pa produced by hurricane 12 and 3 times the safety factor).
Junction Box
. Features
It is used to output the photovoltaic modules to produce electricity and to protect the components when the components are shaded and shaded.
Composition
1, box, box cover: made of high weather resistance, high flame-retardant plastic material, to provide protection for the various components within the box.
2. Bypass diodes: Bypass the device to ensure that the component is not covered by shadows and does not cause the entire module to fail.
3, cable: for electrical output, with good weather resistance and flame retardant.
4. Connector: It is used for the connection between adjacent components to form a power generation system with a certain scale, and should have good weather resistance, flame retardancy and electrical properties.
Tin coated copper tape
Tin-coated copper tape is used for the electrical connection of the internal battery of the module. Pure copper is used as the base material and a tin layer is coated on the surface to prevent oxidation and discoloration of the copper-based material. On the other hand, it is convenient for welding materials to the grid of the battery. on-line.
Tin coated copper strip performance indicators:
1. Tensile strength: It shows the tensile properties of copper tape;
2. Elongation: It reflects the ductility of the copper tape;
3. Peeling strength: It refers to the peeling strength of the battery sheet. Generally, the pulling force is greater than 0.3kgf.
Sealant
Performance requirements:
One-component RTV silicone rubber, white in color, low in odor, non-solvent, non-corrosive. Excellent weather resistance, excellent resistance to UV aging and ozone resistance.
Consider the main performance indicators of PV sealant:
1. Mechanical properties: hardness, tensile strength, elongation at break, shear strength;
2. Electrical properties: volume resistivity, breakdown dielectric strength;
3. Curing depth: 24 hours curing depth requirements greater than 2mm.
Packaging Material--EVA
Ethylene-vinyl acetate copolymer (EVA) is a copolymer of ethylene (E) and vinyl acetate (VA).
EVA solar cell film is a film-like product that is heated, cast, and extruded by production and processing equipment, using EVA as the main raw material, adding various modification aids, and mixing thoroughly.
When used, thermal cross-link curing occurs, resulting in permanent adhesive seals that can withstand a wide range of climatic conditions and harsh conditions.
Features of EVA
EVA film is used for solar cell module packaging and has the following performance characteristics:
1. High light transmittance;
2. Reasonable degree of crosslinking;
3. Excellent UV aging resistance and excellent resistance to moist heat aging;
4. Very low shrinkage rate;
5. For a variety of backplanes and glass have a strong long-term adhesion;
6. Higher volume resistivity.
Backboard material
The solar back sheet is composed of multi-layer polymer films laminated by rolling, and plays a role of protection and support for the battery sheet, and has reliable insulation, water resistance, and aging resistance.
Features:
Excellent weather resistance
Low water vapor permeability
Good electrical insulation
Certain mechanical properties
Backplane components
PET provides mechanical properties and insulation properties, and fluorine materials provide barrier properties and weather resistance.
The quality of the backboard product also depends mainly on the surface of the fluorine material, in general as long as the proper processing, the fluorine content is sufficient, the weather resistance and barrier properties of the backboard are not a problem.
Only PVF composite membranes were first used by backplane manufacturers, and the use of PVF composite membranes has been validated for more than 20 years. Therefore, the current acceptance of PVF composite membranes is still higher than that of backsheets coated with fluorine coatings.
Solar Back Sheet Industry Status
At present, from a global perspective, there are many manufacturers of solar cells, but there are relatively few manufacturers that can produce solar backsheet materials; the localization of solar cell backsheets in China has been extremely low so far. Currently, domestic solar cell module manufacturers are Most of the backplanes used are imported, and the prices are higher.
In order to reduce the manufacturing cost of the unit power generation of solar modules, and thus further promote the large-scale application of solar cells, localization of backplanes is an inevitable trend and an inevitable choice for component companies.
Solar Backboard Industry Development Trend
· The replacement of solar backsheet materials continues to increase.
PVDF resin is a kind of resin product similar to PVF structure. Its fluorine content is 59% larger than that of PVF 41% because of its high wear resistance, strong stain resistance, high barrier property, high purity, and easy processing and molding. Such characteristics, its application in solar cell backsheet is even better.
Currently PVF benefits from preemptive advantages, and market usage still occupies major advantages. However, it is not difficult to predict that with the use of PVDF and other materials, its market share will be partially replaced.
In addition, backings for polyamide materials have also appeared on the market. Isovolta's AAA backsheet is a co-extruded three-layer polyamide material. Its performance characteristics have also been recognized by the industry.
· Environmentally-friendly solar backplane materials are receiving increasing attention:
Restricted by the relevant environmental protection regulations of various governments and the public's demand for green environmental protection, some manufacturers in the world have begun to use environmentally-friendly materials to replace the existing back-sheet materials.
For example, Japan's Fujimori Industry Factory uses a three-layer modified PET composite solar backsheet that contains no PE and no fluorine (without PVF and PVDF). Its water vapor permeability can be as low as zero, and it truly belongs to green materials. ;
BioSolar, a California-based biomaterials developer, has introduced a new bright white back panel made from plants that can reduce the cost of solar modules. BioSolar said that its bio-based backplane made of renewable materials can make photovoltaic solar modules more environmentally friendly.
· The domesticization of solar backplanes is imperative:
Benefited from the national new energy stimulus policy and the strengthening of human environmental awareness, in recent years, China's photovoltaic-related companies have grown rapidly, and some companies have reached the global leading level in terms of scale and technology.
As countries around the world gradually pay attention to the development of new energy sources, they will all upgrade their energy strategies to the national level. The energy competition among countries will be mainly reflected in the high ground of competition for energy strategies, including high-end solar module raw materials.
In 2010, the demand for solar backplanes in China was around 60 million square meters. China's solar cell module production capacity and output have reached more than 50% of the world's total, but most of the backplane materials are still dependent on imports, so it is necessary to achieve localization of backplanes.
(Althus Chief Technical Expert Zhou Chengbai)
Under the measurement conditions, continuous flow, memory and display of the total amount of cold (hot) water flowing through the enclosed full pipe.
volumetric water meter,dry volumetric water meter,brass volumetric water meter,plastic volumetric water meter
Ningbo Jingcheng Technology Co., Ltd. , https://www.jingchengmeter.com