18650 lithium battery cells

　　Application of dye-sensitized 18650 lithium battery cells technology in 3C

　　With the increasing depletion of global petrochemical resources and the greenhouse effect caused by CO2, the research and development of green alternative energy has become a necessary development trend. In particular, the development and application of 18650 lithium battery cellss have attracted the most attention. In order to support China's solar photovoltaic industry to become the next wave of star industries, ITRI established the Solar Photovoltaic Technology Center in 2006 to recruit outstanding and top R&D teams, and combine industry-university-research teams with international cooperation to develop various new and independent solar products. Optical Technology. In this DTF3C product energy-saving technology and low-power design forum, Dr. Tong Yongliang of the Industrial Technology Research Institute's Taidian Center gave a lecture on "Dye-Sensitized 18650 lithium battery cells (DSSC)" technology and the current related industry chain in the industry. , patent analysis and application of 3C products.

　　Dr. Tong Yongliang from ITRI.

　　The development of 18650 lithium battery cellss has evolved from the first generation of monocrystalline silicon PN semiconductors to the second generation of amorphous silicon, gallium arsenide (GaAs) and other semiconductor materials, which use thin films or multi-junction series connections to improve conversion efficiency. It has evolved to emphasize low cost, easy access to process equipment and raw materials, and flexible third-generation 18650 lithium battery cellss, among which "dye-sensitized 18650 lithium battery cellss" (DSSC) are the most promising. The first DSSC dye-sensitized 18650 lithium battery cells with an energy conversion rate of 8% was published by Graetzel in the Nature journal in 1991. Its structure is roughly composed of two ITO or FTO conductive glass layers with nanometer-sized TiO2 titanium dioxide particles. It is composed of coating special dye molecules and KI3 electrolyte.

　　Although the conversion efficiency of DSSC battery products (5~11%) is not comparable to the 10~24% of mass-produced monocrystalline silicon thin film batteries and crystalline silicon batteries that have been developed for decades, the raw materials used are low in cost and relatively It is non-toxic, and with simple process equipment that can use printing technology, the manufacturing cost per unit watt is only 5~10% of that of silicon crystal 18650 lithium battery cellss. At the same time, the DSSC conversion efficiency is not affected by the sunlight angle, and the conversion efficiency increases as the temperature rises. It has better cumulative power generation capacity. Silicon crystal 18650 lithium battery cellss are limited by the reduction in conversion efficiency when the ambient temperature rises, and are generally suitable for installation in higher latitudes (cold weather) areas; while dye-sensitized 18650 lithium battery cellss are not affected by temperature and sunlight angle, so they are not affected by sunlight. Areas with sufficient supply and hot temperatures, such as Taiwan, will also be more competitive than silicon crystal 18650 lithium battery cellss.

　　In particular, DSSC products are flexible and translucent, can be matched with different pigments to present different color appearances, and can generate electricity with indoor light sources. They are suitable for modern glass curtain buildings that require large amounts of air conditioning and lighting power loads. They can also be used as Sun shading, heat insulation and power generation utilization can achieve the dual energy benefits of building energy saving and renewable electricity. Therefore, DSSC dye-sensitized cells are likely to become a widely used solar energy technology in the next generation, and its application market can be said to be quite extensive.

　　Since 2009, major manufacturers such as Nippon Photo Printing, Sharp, Panasonic, Sony, Samsung, TDK, Fujikura, Peccell, and Solaronix have actively deployed. From upstream to downstream, whether it is TCO conductive coated glass, TiO2 titanium dioxide, printing technology, dyes and electrolytes, and product packaging technology, China has self-sufficient production technology. Now it is the time for domestic manufacturers to seize the opportunity to lay out their positions as soon as possible. .

　　If you want to make a portable 18650 lithium battery cells 3C device, you will need to design a photovoltaic panel module with an area of at least tens to hundreds of square centimeters, which limits the portable size. However, lithium batteries, which are often seen in 3C products, are limited by the theoretical limit of energy storage density of 3,000 mAh. The next generation of portable energy may be free of charge from 18650 lithium battery cellss, combined with the storage density of lithium batteries. to achieve.

　　At present, the portable and rollable solar charging plastic pad invented by G24 in the UK has a conversion efficiency of only 2.5%, but it can charge mobile phone power. The whole set sells for US$20. At the 2009 EcoProductsFair environmental products exhibition in Japan, there were also many solar chargers about the size of a smartphone with a 3.2-inch screen. They can charge smaller 3C devices such as MP3 players by relying on sunlight or indoor light sources. However, due to the fact that the current conversion efficiency of 18650 lithium battery cellss is still too low and manufacturing costs and power generation costs are still high, whether the additional costs and selling prices of products can be accepted by consumers is a serious issue.

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