Views: 0 Author: Site Editor Publish Time: 2022-11-20 Origin: Site
Now, people buy new energy vehicles objectively have to choose between two technologies lithium iron phosphate and ternary lithium batteries, the industry told us: pay attention to range and vehicle lightness to choose the ternary system, pay attention to the safety of lithium iron phosphate system. In this regard, consumers are eager to industry insiders to give a practical answer from a technical point of view: lithium iron phosphate batteries are safe? This question should be answered from the material / structural stability, production process, charge and discharge characteristics of the three aspects.
1. lithium iron phosphate is currently the safest lithium-ion battery cathode material, does not contain any heavy metal elements harmful to humans, its olivine structure is difficult to precipitate oxygen, which improves the stability of the material.
2. lithium iron phosphate battery production process and other lithium battery varieties are largely the same, the core processes are: dosing, coating, rolling, production, winding. In the batching process, lithium iron phosphate material conductivity is relatively poor, so the particles are generally made smaller, the objective effect of doing so is that: the internal arrangement is more uniform, prompting the formation of a balanced voltage platform, the work can maintain the stability of the battery state.
3. charge and discharge are the two basic working states of lithium batteries. When the lithium iron phosphate battery charging and discharging, because the iron ion oxidation ability is not strong, will not release oxygen, it is naturally difficult to occur with the electrolyte redox reaction, which makes the lithium iron phosphate battery charging and discharging process in a safe environment. Not only that, lithium iron phosphate battery in the large multiplier discharge, and even overcharge and discharge process, it is difficult to occur in the violent redox reaction. At the same time, lithium in the de-embedding, lattice changes so that the cell (the smallest constituent unit of the crystal) will eventually shrink in size, which just offset the increase in the volume of the carbon cathode in the reaction, so the charge and discharge of lithium iron phosphate can maintain the stability of the physical structure, eliminating the potential for increased volume and the phenomenon of battery burst.
The above-mentioned battery safety is for the sake of convenience and the use of a single example to illustrate, when put into use, lithium iron phosphate batteries need to provide the rated voltage and capacity for electrical appliances, it is necessary to carry out the lithium iron phosphate battery with the group, that is, the single lithium iron phosphate battery through the series / parallel / series-parallel way to equip the practical lithium battery pack. The most important thing to pay attention to is the consistency of the individual cells. Usually, it also has a balanced management system to ensure the safety of lithium battery use through the control of key parameters, which is a common feature of all types of lithium battery pack.