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Fast charging technology of lithium iron phosphate battery

Time:2021-01-06 Views:160

  Different battery data systems have different advantages and disadvantages. New battery data systems continue to appear, showing a trend that is better than blue. Especially after the release of the ternary data of electric buses, the system has become more and more popular. As the mainstay of the battery data system at that time, as its energy density is getting closer and closer to the upper limit, what other killers can ensure that the lithium iron phosphate data system can exist independently in the market? The development prospects of lithium iron phosphate batteries have received widespread attention .

Fast charging technology of lithium iron phosphate battery

  The crisis of lithium iron phosphate

  Lithium-ion battery positive data includes lithium cobalt acid, lithium manganese acid, lithium nickel acid, lithium iron phosphate, ternary data and so on. In terms of working principle, lithium iron phosphate is also an embedding/de-embedding process of lithium ions, which is the same as lithium cobalt oxide and lithium manganate. Lithium iron phosphate is often compared to a ternary lithium-ion battery, which is also the focus of debate in the industry.

  In the information differentiation attack at a certain temperature, the ternary data is at 200 degrees Celsius, the onset of differentiation and the lithium iron phosphate material is differentiated at 800 degrees Celsius, which means that the ternary information is more likely to become the chess piece of the fire accident. The battery needs to have the same level of safety and higher skills and technology.

  However, the energy density of lithium iron phosphate is lower than that of a ternary battery. The energy density of the lithium iron phosphate battery is about 145Wh/kg, while the energy density of the ternary lithium ion battery is relatively high, and the energy density of the ternary lithium ion battery is about 220Wh/kg. Therefore, given the data characteristics of lithium iron phosphate, the energy density of lithium iron phosphate batteries frequently transmitted in the industry is limited and may be replaced by other battery systems in the future.

  At present, when intellectual property rights are getting more and more attention, lithium iron phosphate is less than 3 yuan, which restricts the development of lithium iron phosphate batteries. The earliest patent application for lithium iron phosphate was obtained by FXMITTERMAIER & SOEHNEOHG (DE) on June 25, 1993, and the application result was announced on August 19, 1993. The basic patent for li-ironphosphate held by the University of Texas and the carbon coating patent applied by Canadians are difficult to bypass. The global patent statistics of the nickel-cobalt-manganese ternary lithium-ion battery industry of institutions and the automotive industry in 2017 show that whether the patent layout of other countries is still in my country, technological innovation protection awareness, ternary lithium-ion battery manganese-cobalt-nickel technology development hot spots , The patent application of nickel-cobalt-manganese ternary lithium-ion battery is the world's leading in my country. Therefore, in terms of patents, the advantages of lithium iron phosphate are not as good as ternary batteries.

  In terms of energy density, the upper limit of lithium iron phosphate is slightly lower and there is almost no space, but it provides users with a window to understand the charging speed. As a technical path that must be overcome for the development of new energy vehicles, fast charging has obvious effects in alleviating driving distance anxiety and shortening charging time. Therefore, fast charging has become the development direction of automobile companies and battery companies, and it is also a bright spot in the future application of lithium iron phosphate batteries.

  Announced at the end of December 2016, in addition, the new energy vehicle allowance adjustment method, 3c-5c and 5c-15, 15c+c three levels of fast charging rates, respectively, 0.8 times, 1 time, 1.4 times, in the policy encouragement Next, companies that use lithium iron phosphate technology have stepped up their efforts to develop fast charging, and fast-charging lithium iron phosphate batteries have created a new breakthrough.

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