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What is the cause of the decline in lithium batteries for electric vehicles?

August 13, 2019

As a power source device for new energy vehicles, lithium-ion power batteries are related to the cruising range of vehicles. However, in actual use, the battery will be degraded due to various factors. This is like us. Like the electronic products, after a long time of use, you will find that the performance is not as good as before, and the power is not as good as before. When it comes to the cause of the decline of the lithium battery, you still need to look at the working condition of the lithium battery.

Lithium battery mainly converts chemical energy into electric energy through internal electrode oxidation reaction. The internal structure of lithium battery is composed of positive and negative electrode materials of battery and electrolyte. When the battery is repeatedly charged and discharged, the internal motor of the battery will The battery body electrode will produce crystals, causing the internal conductivity of the battery to decrease, that is, the activity of lithium ions is decreased, which will cause its resistance to increase, and finally affect the attenuation of the battery capacity. In fact, from the actual In view of the environment, it affects the battery decline, the voltage of charge and discharge, and even the power of the battery including the charge and discharge and the temperature of the environment.

At present, the new energy vehicle battery mainly uses ternary lithium battery, then the biggest point for the ternary lithium battery is that it will be afraid of the high temperature of the environment, which will affect the life of its use. Of course, this will also affect To the energy density, the power of the electric car is working. The battery decline is mainly due to the fact that the vehicle is in use. Different charging and discharging rates are used to meet different driving conditions. The charging and discharging rate is larger, and the battery capacity is increased. The faster the attenuation, the more it is mainly due to the change in the structure and properties of the material, making the internal ion diffusion become relatively difficult.

For the battery, if the internal resistance is inconsistent, it will be a situation in which the internal current and voltage are unevenly distributed, which may cause a partial undervoltage of the individual battery. In general, the factors affecting the life of the power battery pack are In fact, there are still a lot of them. Of course, various factors are also affecting each other. The current decline of lithium-ion battery is also an inevitable situation. With the continuous improvement of the technology of power batteries, the problems related to the battery capacity decline are solved. It is very important to extend the service life of the power battery. Of course, this is also crucial for the development of electric vehicles.

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