Lithium Iron Phosphate Battery Fast Charge -Lithium - Ion Battery Equipment

Lithium Iron Phosphate Battery Fast Charge -Lithium - Ion Battery Equipment

As the most important technical path for the development of new energy vehicles, fast charging has a significant effect on relieving cruising range anxiety and reducing charging time, so it has also become the market choice of many car companies and battery companies.

In the new energy vehicle subsidy adjustment plan released at the end of 2016, the fast-charging pure electric bus is regarded as a separate subdivision product, and a detailed subsidy standard is given: according to the electric capacity of the bus, a subsidy of 3,000 yuan/Kwh can be obtained. "3C-5C, 5C-15C, 15C+" 3 grades of fast charging rate get 0.8 times, 1 times, and 1.4 times subsidies respectively.

In this context, mainstream car companies including Beiqi Foton, Yutong, Xiamen Jinlong, and power battery companies such as Ningde Times, Waterma, Mengli, and Weihong Power have begun to increase their layout in the field of fast charging.

From a technical point of view, although there are frequent reports in the scientific community that certain research or new materials can greatly improve the energy density of batteries, in actual production applications, due to cost, technology, process and safety considerations, battery life is still It is a major factor restricting the development of new energy vehicles. Before a revolutionary breakthrough in battery technology, choosing fast charging to alleviate the shortcoming of new energy vehicles' cruising range is a good way to find another way.(Lithium - Ion Battery Equipment)

In fact, the application of fast charging in power batteries has already blossomed everywhere. But looking at its technology, in fact, the same results are achieved. The core of fast charging technology is to accelerate the speed of lithium ions moving between positive and negative electrodes through chemical system and design optimization without affecting the life and safety of cells.

When batteries with ordinary chemical systems are fast charged, by-products will appear in the negative electrode, which affects the cycle and stability of the battery cells. The general solution to this stumbling block is to make the negative electrode capable of withstanding fast charging by using specially designed negative electrode materials (such as hard carbon, soft carbon, carbon-coated graphite, etc.). For the positive electrode material that is only used as a source of lithium ions, there is actually no requirement. In theory, as long as enough lithium ions can be provided, it can be used as a positive electrode.

Although the fast charging technology is quite different, the specific application is also the eight immortals crossing the sea to show their magical powers. Inventory of the mainstream fast-charging batteries on the market, the author divides them into three types according to battery materials: iron phosphate batteries, lithium titanate batteries, and lithium manganate batteries.

Some people say that lithium iron phosphate is not suitable for fast charging because its conductivity is not good enough, and it is easy to heat up during fast charging. But this is only for the pure-phase lithium iron phosphate material, which has good ion and electron mobility after grain refinement, surface carbon coating, and unit cell element doping, which is suitable for fast charging. The characteristics of high safety, high thermal stability and long cycle life of lithium iron phosphate phosphate make it a good choice for fast charging. At present, domestic companies focusing on lithium iron phosphate fast charging technology are represented by CATL and Waterma.

As a representative enterprise of lithium iron phosphate battery, CATL has its own quite mature system on the way of fast charging. CATL is the only national enterprise in China that can benchmark with Japanese and Korean battery companies, with internationalization of resources, internationalization of customers and internationalization of talents. The company has strong human resources and an excellent R&D team. From R&D and design, to production, to testing and verification, to production, it has strong resource support, laying the three advantages of product safety, reliability and durability.

Dr. Wang Shengwei, a fast charging expert from the Technology Department of CATL, introduced its fast charging technology at the "2016-2017 China Bus Industry Development Summit Forum". For the positive electrode, CATL has developed the "super electronic network" technology, which enables lithium iron phosphate to have excellent electronic conductivity, which can reach 1,000 times that of ternary materials. Safety and reliability.



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