18650 lithium-ion battery classification
18650 lithium-ion battery production are to have protection lines to prevent the battery from being overcharged and overdischarged. Of course this about lithium-ion batteries are necessary, which is also a general disadvantage of lithium-ion batteries, because the materials used in lithium-ion batteries are basically lithium cobaltate material, and lithium cobaltate material lithium-ion batteries can not be discharged at high current, the safety is poor, from the classification of 18650 lithium-ion batteries can be classified in the following way.
Power type battery and energy type battery. Energy type batteries are characterized by high energy density and are important for high energy output; power type batteries are characterized by high power density and are important for instantaneous high power output and output. The power-energy lithium-ion battery is accompanied by the emergence of plug-in hybrid vehicles. It requires a higher energy stored in the battery, which can support a distance of pure electric driving, but also to have better power characteristics, and enter the hybrid mode at low power.
Simple understanding, the energy type is similar to the marathon runner, to have endurance, is the requirement of high capacity, the high current discharge performance requirements are not high; then the power type is the sprinters, the fight is burst power, but endurance should also have, otherwise the capacity is too small will not run far.
Lithium-ion batteries are divided into liquid lithium-ion batteries (LIB) and polymer lithium-ion batteries (PLB).
Liquid lithium-ion batteries use a liquid electrolyte (which is mostly used in power batteries today). Polymer lithium-ion batteries use a solid polymer electrolyte instead, which can be either dry or gel, and most of them currently use polymer gel electrolytes. Regarding solid-state batteries, strictly speaking, it means that both electrodes and electrolytes are solid.
Divided into: cylindrical, soft package, square.
Cylindrical and square outer packaging is mostly steel or aluminum shell. Soft pack outer packaging is aluminum plastic film, in fact, soft pack is also a kind of square, the market is accustomed to the aluminum plastic film packaging called soft pack, some people also call soft pack batteries polymer batteries.
About the cylindrical lithium-ion battery, its model number is generally 5 digits. The first two digits are the diameter of the battery, and the middle two digits are the height of the battery. The unit is millimeter. For example, the 18650 lithium-ion battery, which has a diameter of 18 mm and a height of 65 mm.
Anode materials: lithium iron phosphate ion battery (LFP), lithium cobalt acid ion battery (LCO), lithium manganate ion battery (LMO), (binary battery: lithium nickel manganate / lithium nickel cobalt acid), (ternary: lithium nickel cobalt manganate ion battery (NCM), lithium nickel cobalt aluminum acid ion battery (NCA))
Negative materials: lithium titanate ion battery (LTO), graphene battery, nano carbon fiber battery.
The concept of graphene in the relevant market refers importantly to graphene-based batteries, i.e. graphene slurry in the pole piece, or graphene coating on the diaphragm. Lithium nickel-acid and magnesium-based batteries are basically non-existent in the market.
Post time: Dec-12-2022