What is the reason for the decline of lithium batteries in electric vehicles?
As the power source device of new energy vehicles, lithium-ion power battery is related to the endurance mileage of vehicles. However, in the actual use process, the battery will decline due to the influence of various factors, which is just like our electronic products. After a long time of use, we will find that the new agriculture is not as good as before, and the electricity is not as good as before Speaking of the reasons for the decline of lithium batteries, we need to start from the working conditions of lithium batteries.
Lithium battery mainly converts chemical energy into electrical energy through internal electrode oxidation reaction. The internal structure of lithium battery is composed of positive electrode, negative electrode material and electrolyte. When the battery is charged and discharged repeatedly, the motor inside the battery will make the electrode of the battery body material produce crystal, which will lead to the decline of the internal conductivity of the battery, that is, the activity of lithium ion In fact, from the perspective of the actual environment, it will affect the decline of the battery, including the charging and discharging voltage, even the charging and discharging power of the battery and the temperature of the environment.
At present, the battery of new energy vehicles mainly uses the ternary lithium battery, so the biggest point for the ternary lithium battery is that it will be afraid of the high temperature of the environment, which will affect its service life, of course, this will also affect the energy density. In terms of the power of electric vehicles, the battery recession is mainly caused by the fact that the vehicle is in the process of using, for example Different charge discharge ratio is used to meet different driving conditions. The larger the charge discharge ratio is, the faster the battery capacity decays. In fact, due to the change of material structure and property, the internal ion diffusion becomes relatively difficult.
For batteries, if the internal resistance is not the same, it will be the uneven distribution of current and voltage, which will lead to the undervoltage of a local single battery. In a word, there are many factors that affect the life of the power battery pack. Of course, various factors also affect each other. The current decline of lithium-ion power battery is inevitable With the continuous improvement of power battery technology, it is very important to solve the problem of battery capacity decline to extend the service life of power battery. Of course, it is also crucial for the development of electric vehicles.