Ningde era Wang Shengwei: lithium iron phosphate fast charging technology of new energy bus applications
Publish：Sino Energy Corporation Time：2017-01-09
[lithium engineering comprehensive report]
In the year 2016-2017 China bus industry development forum, Ningde times new energy Polytron Technologies Inc (hereinafter referred to as CATL) technology of fast charging expert Dr. Wang Shengwei, to "CATL lithium iron phosphate fast charge technology application of new energy bus" as the theme, made a wonderful speech.
Wang Shengwei introduction, CATL was founded in 2011, the rapid development of technology resources reserves, in 2012 12th Five-Year the national key support, to establish cooperation with foreign luxury car BMW company; in 2013, the formation of CATL cooperative relationship with domestic famous Yutong Bus Company; in 2014 the German branch established in 2015, academician workstation was established, and selected national R & D projects the focus in 13th Five-Year. 2015 sales ranked three in the world, the country‘s top two, is expected in this year‘s ranking is expected to further enhance.
CATL is the only one with South Korea battery enterprise benchmarking of national enterprises, have the resources and talent internationalization, internationalization of international clients. Enterprise human resources is abundant, outstanding R & D team, from design to production, research and development, to the test, put into operation, powerful resources support, provides three major advantages of product safety, reliability and durability. Fast charging technology, the power battery CATL accumulate steadily, become a shining star in the industry.
On the choice of fast charging materials, CATL is mainly used as the cathode material of lithium iron phosphate and graphite as the anode material. For many people think that lithium iron phosphate can not do fast charging, Wang Shengwei made a professional and detailed analysis. He believes that some of this understanding, only know one, I do not know the second one sidedness.
As we all know, the general chemical system of the battery, fast charging when the cathode will produce a by-product, thereby affecting the core of the cycle and stability, can only be used to withstand the rapid charging of high current anode material to achieve fast charging. Professional quick charge field, focus on fast charge in the anode, and the cathode for choice, whether it is three yuan or lithium iron phosphate, will not affect the performance of fast charging, and its reliability. Therefore, the core of fast charging technology lies in the optimization of the chemical system and design to accelerate the speed of the lithium ion moving between the positive and negative poles, reducing or blocking the production of the negative side products.
But that is not suitable for lithium iron phosphate fast charge, and has a certain reference value, because the traditional conductive lithium iron phosphate is relatively poor, the effect of heating fast charge, so to solve the above two issues, in-depth technical research by CATL, innovative solutions are given.
In the cathode, CATL has developed a "super electronic network technology, makes the lithium iron phosphate has excellent electronic conductivity of up to three yuan, 1000 times the material, and the cathode of the lithium iron phosphate also take into account the high safety and reliability of the battery fast charging system.
In the anode surface of graphite, CATL uses a "fast ion ring" technical modification, the modified graphite taking into account the characteristics of super fast charging and high energy density, fast charge is negative no by-products, so greatly improve the speed of embedding of lithium ion in graphite layer, which has 4-5C fast charging capability, 10-15 minutes fast charge, and can guarantee the energy density of the system level above 70wh/kg, realize the cycle life 10000 times.
In addition, the current development of fast charging products CATL, thermal management system equipped with self-developed, full recognition of fixed chemical systems at different temperatures and SOC under the "health charge interval", greatly broaden the operating temperature of lithium battery. When the battery is in the cold northern winter, hot water system at low temperature for electric heating core, when the electric core temperature requirements, namely open fast charge mode; meet South hot summer, the battery system automatic heating alarm, water cooling system for cooling the electric core, truly "fast charge full climate".
Wang Shengwei said, CATL select lithium iron phosphate graphite fast charging technology has three characteristics. The first is the high rate of ten minutes, quickly filled with basic, comparable fuel vehicle refueling time; followed by long life, can reach more than 10000 times the charge discharge cycle, meet the bus customers using 8 year warranty requirements; again is high security system, lithium iron phosphate battery at this stage is relatively mature and safety, the start demonstration application in "11th Five-Year", as the main force in the development of electric vehicles in 12th Five-Year. ". Lithium iron phosphate battery is proven by the practice, more mature battery materials.
The market for application of lithium iron phosphate fast charging technology, Wang Shengwei CATL has studied as early as three years ago, many of the current bus customer prototype is already in use, is now beginning to spread, mainly from the product for CATL, hope to provide reliable, safe and has been developed to meet the passenger car battery products.
Fast charging technology of lithium iron phosphate, and thermal management system escort, CATL has been at the forefront of the industry, is a step by step to achieve long-term, reliable and safe bus to meet the demand of fast charging, fast charging technology for future CATL a good prospect!
