Actual life and theoretical life of lithium batteries

Often the actual life span is always less than the theoretical life, and it can not reach the theoretical life value. Why is this? It has been said that the life of a lithium-ion battery is generally determined at the moment the battery is made, based on the fact that the life of the battery is determined by the material, and the life of the battery calculated solely on the basis of the material and structure is called the theoretical life. However, the actual life of lithium batteries in operation is often expressed as the actual life, and the degree of actual life less than the theoretical life is caused by the non-working loss of capacity. Today, the electric car lithium battery expert, to explain to you.

This non-working loss is affected by the following factors:

1, the side reaction of lithium ion batteries.

2,Inreversible consumption of active substances in lithium-ion batteries;

3, for large lithium-ion batteries, the battery working current is large, heat dissipation is slow, easy to damage the battery structure.

4, if you add security measures to the lithium battery, it needs to be maintained by the power provided by the lithium battery.

The reduction of lithium battery capacity is manifested in the charging, discharge, and self-discharge of lithium battery:

1,As the number of cycles increases, the charging time decreases. The charging platform of the lithium battery is from 3.7 V to 4.2 V. The charging capacity at this stage accounts for more than 90 % of the total charge. As the number of cycles increases, the voltage increases faster and the charging capacity decreases.

2, the ratio of self-discharge of lithium battery to the total battery power of lithium battery increases with the increase of the number of cycles, but the discharge platform of lithium battery is accelerated and reduced.

Lithium battery life is still limited, which is a natural law, but to extend the battery life has to be scientifically charged and discharged.

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