Mass Production and Application of 12BB Graphene High Efficiency Modules-ZNshine

Mass Production and Application of 12BB Graphene High Efficiency Modules Wang Dong Introduction of ZNSHINESOLAR Development process ZNSHINESOLAR Focus on Main business Power station development and operation and maintenance EPC Module Manufacturing Contents Performances of Graphene Glass Value of Graphene glass Technology Power Station With Graphene Module Mass production of ZNSHINE 12BB Module Application of graphene technology Graphene material is considered as the king of new materials. It is the thinnest and lightest, most flexible, strongest, and most conductive nano-material in the world. It is recognized as a revolutionary and subversive new material in the 21st century. Applications:  As filter film in various fields  Good electrical conductivity: next generation supercomputer  Cable for making “space elevator“  Display screen of computer, TV, mobile phone  New generation solar cell  Photon sensor  Medical disinfection and food packaging  Composite with plastic– New plastic  Transparent touch screen, light transmissive board  High-performance integrated circuits and new nanoelectronic devices  Ultra-thin and ultra-light aircraft materials Introduction of ZNSHINE Graphene Module Technology Graphene coated glass Theory: The use of graphene film to enhance anti-reflection, self-cleaning, photocatalyst to increase module power and increase module power generation capacity. Products generation I: Glass single-sided coating technology Products generation II: Glass bifacial coating technology (In research) Graphene high efficiency solar cell (In research) Theory: graphene with the excellent thermal conductivity and the excellent transmittance of light, can enhance the conversion efficiency of solar cell. Transmittance of graphene-based anti-reflective glass Tran smit tan ce/ % wavelength Broad spectrum transmittance curve  Graphene-based antireflection filim has excellent light transmission properties: AM1.5 transmittance: 94.05%; Visible light transmittance: 94.30% Coating Uncoating Graphene-based anti-reflective glass: dust accumulation prevention Semi-closed pore structure of graphene coating layer Stacked open structure of conventional coating layer Graphene coated glass Ordinary coated glass Struc tur e of coa tin g la ye r Du st acc umu latio n c ompar iso n Graphene-based anti-reflective glass: Hydrophilicity Hydrophilic, Below 20。 Hydrophobic, Above 90。 Contact angle Super hydrophilic, Below 5。 Graphene-based antireflection coating layer contact angle measured, 4.5。 Coating Uncoating Graphene-based anti-reflective glass: Self-cleaning Graphene coated glass Ordinary coated glass Graphene Coated Glass Module Ordinary Coated Glass Module Before rain Before rain After rain After rain Du st accu mula tio n Module surface area dust test Sunny Rainy Ordinary Coated Glass Graphene Coated Glass Accumulation Period Scouring Period Outdoor placement for one month Photocatalyst: Decomposition of organic pollution Photocatalyst self-cleaning mechanism Glass Glass Gla ss Glass Glass Phot oc atal yst coa tin g Phot oc atal yst coa tin g Phot oc atal yst coa tin g Phot oc atal yst coa tin g Phot oc atal yst coa tin g Dir t Degradation effect of methylene blue solution under the action of photocatalyst： Ultraviolet irradiation Reliability evaluation of graphene glass Light transmittance, pencil hardness, hydrophilic angle, organic decomposition 85° 85% humidity, 1000 hours 85° , ‐40° Cycle 200 times UV irradiation 60Kwh / m2 Wind-resistant sand (200um quartz sand, 10m/s, 24h) Acid resistance (1mol/l HCl, soaked for 24h) Neutral salt spray resistence Light transmittance, pencil hardness, hydrophilic angle, organic decomposition Standard Contents Performances of Graphene Glass Value of Graphene glass Technology Power Station With Graphene Module Mass production of ZNSHINE 12BB Module The effect of dust accumulation on module power Cell Glass Dust Light Optical path（ shading）） Test under continuous dust accumulation 0 Module power reduced by 25% Transmittance Peak power Outdoor placement for one month The effect of dust accumulation on operating temperature of module Dust density Dust density Up to 2。 C difference, average difference 1 。 C Ordinary Coated Glass Module Graphene Coated Glass Module Time Temper atur e The effect of dust accumulation on power generation efficiency Power generation efficiency of module with dust Irr ad iat ion Po wer gen era tion ef fic ien cy Irradiation Power generation efficiency Average efficiency line Po wer gen era tion ef fic ien cy Power generation efficiency comparison of with and without dust accumulation Harm of organic pollutants such as bird droppings A bird dropping will put the module in a sub-health state. Long-term sub-health of module can affect the reliability and longevity of the product, even can cause fires. Contents Performances of Graphene Glass Value of Graphene glass Technology Power Station With Graphene Module Mass production of ZNSHINE 12BB Module Graphene field tracking effect report Compare the power generation capability and the glass self-cleaning effect of the 5BB graphene module and 5BB conventional module . Module specification The first square matrix is made up of multi graphene module of 265W (60 pcs)； The second square matrix is made up of multi ordinary module of 265W (60 pcs) ; (Each square matrix consists of 13 modules) Test location: ZNSHINE Solar Plant Zone Graphene field tracking effect report -- power generation Increased 5BB graphene module power generation gain Graphene field tracking effect report -- Hydrophilic effect Conventiional Graphene Rain particles are small and not easy to flow Rain particles are large and will fall off quickly Graphene field tracking effect report – dust accumulation prevention 5BB graphene multi module 5BB conventional multi module Summary  The emergence of graphene glass has accelerated the decline in LCOE. 1. Graphene glass increases module power and reduces manufacturing costs; 2. Graphene glass increases system power generation and increases user return on investment; 3. Graphene glass improves self-cleaning and reduces user maintenance costs; 4. Graphene glass reduces the risk of hot spot of module and makes users safer to use.  Graphene glass technology can be perfectly integrated with existing various cost reduction and efficiency increased technologies. 1. Graphene glass can achieve the anti-reflection effect of light in different wavelength bands through the adjustment of the process, which complements PERC technology and black silicon technology. 2. Graphene glass can be used in products such as conventional modules and double-glass modules, and the effect is equally excellent. conventional Graphene coated glass Contents Performances of Graphene Glass Value of Graphene glass Technology Power Station With Graphene Module Mass production of ZNSHINE 12BB Module Advantages of 12BB module Advantages Reduce resistance, Efficiency improvement Reduce crack risk Round solder ribbon with self- reflection Save silver paste and reduce costs Good appearance High compatibility, half-cut technology, high-efficiency cell Production line quality problem distribution 12BB cell Percentage Tabbing position deviation Ribbon overall offset Flux residue Cell breaks Secondary rework Foreign material Cell cracks Bubble Corner breakage EVA insoluble Back sheet imprint Ribbon unwelded Overflow The tabbing position deviation and ribbon offset accounted for more than 50% of problems. The reason is mainly related to cell graphics, paste, ribbon, equipment debugging and so on. Welding tensile force Cell welding tensile force test standard: 1. MBB cell welding tensile force, front ≥ 0.8N is qualified, rear ≥ 0.8N is qualified 2. The positive/negative electrode does not allow more than two consecutive pseudo soldering joints; the effective grid area of the entire grid line is not less than 85% of the total solder area. 3. No pseudo soldering in the busbars head and tail. 4. Test method (consistent with the routine): The dynamometer is 180° in reverse with the cell busbar and is pulled at a constant speed of approximately 1cm/s for peel test. Test Data： 12BB cell front side 12BB cell rear side Average Average Optimized design of 12BB cell graphics Optimization content: 1.The pad width is increased as appropriate. 2. The number of pads changed from 108 to 120 3. The pad position corresponds to the position adjustment with the welding machine needle. 4.The number of fingers changed from 89 to 109 Before Optimization After Optimization Ribbon and pad offset No offset Other optimizations of 12BB cell module NO. Type Items 1 Materials Uneven tin-coated layer of ribbon 2 Materials Cell pattern and pastes improvement 3 Materials Choose the right flux 4 Equipments Welding head adjustment 5 Equipments Improve flux spray system 6 Equipments Improve the ribbon clamp to prevent the ribbon from twisting 7 Equipments Replace the welding belt traction clamp to avoid deflection of the welding head when pulling 8 Equipments Optimize welding belt tension and vacuum adsorption 9 Equipments Preheating temperature optimization of the cell before soldering 10 Equipments Replace the welding strip coating base plate and change to the sinking type to avoid flux overflow Products Yeild ZNSHINE Solar 500MW/a 12BB cell module production line was officially put into operation in Q4 2017. Jan. Feb. Mar. Apr. May Jun. Production: 12.1MW Yield : 91.61% Production: 10.3MW Yield : 94.81% Cell graphics optimization Yield : 99.25% Production: 7.2MW Yield : 99.12% Production: 12MW Yield : 98.78% Yield : 99.46% Continuous improvement