lipo battery 3s self-discharge factors

Today, I will continue to explain the factors affecting the self-discharge of lipo battery 3s. Last week, I introduced the influence of the environment and its humidity on the self-discharge of lipo battery 3s in the article: lipo battery 3s self-discharge dry goods! This article will introduce The effect of standing time and diaphragm thickness on the self-discharge of lipo battery 3s, let's find out with me.

Lipo battery 3s self-discharge concept

The lipo battery 3s with a certain amount of electricity will lose a part of its capacity after being stored for a period of time at a certain temperature. This is the self-discharge of the lipo battery 3s. Simple understanding, self-discharge is the capacity loss of lipo battery 3s when it is not used, such as the power of the negative electrode returns to the positive electrode or the power of lipo battery 3s reacts through side reactions.
The consistency of self-discharge is an important part of the influencing factors. The SOC of lipo battery 3s with inconsistent self-discharge will vary greatly after a period of storage, which will greatly affect its capacity and safety.

Lipo battery 3s self-discharge factors

lipo battery 3s rest time
Studies have shown that the self-discharge rate of lipo battery 3s is the largest at the beginning of standing, and then gradually becomes smaller as time increases until the self-discharge rate of lipo battery 3s ages to a certain extent, and the self-discharge rate rises again. This is because as the standing time increases, the SEI layer at the internal electrode/electrolyte interface of the lipo battery 3s gradually thickens, which hinders the transfer of ions and electrons between the electrode and the electrolyte, making the self-discharge slower.

lipo battery 3s diaphragm thickness
In Zhang Wujun's article "The Effect of Diaphragm Thickness on Battery Self-discharge at Different Temperatures", it is mentioned that increasing the thickness of the diaphragm can inhibit the physical self-discharge of lipo battery 3s at room temperature. The increase in the thickness of the diaphragm can suppress the increase in pressure drop and internal resistance of the lipo battery 3s during shelving at room temperature, but the increase in internal resistance increases during high temperature shelving due to the increase in liquid retention.

Measuring method of self-discharge of lipo battery 3s

Lipo battery 3s capacity test: Before the battery is put on hold for a long time, charge and discharge the lipo battery 3s once, and record the discharge capacity Q0 before standing. After standing, discharge was performed under the same discharge conditions, and the discharge capacity Q after standing was recorded. The self-discharge rate η is calculated from (Q0-Q)/Q0*100%.
Open circuit voltage test: Characterize the self-discharge of the lithium battery by directly measuring the change of the open circuit voltage before and after the 3s static process of the lipo battery.

lipo battery 3s current test: charge the lipo battery 3s with a small current to maintain the voltage of the battery unchanged, and the charging current value when it is stable is the self-discharge current.
The above is all about the self-discharge of the lipo battery 3s today. I believe that after reading the whole text, everyone has a deep understanding of the self-discharge of lithium batteries. Self-discharge is the loss of capacity of the lipo battery 3s when it is not used.

For example, the power of the negative electrode returns by itself The phenomenon that the power to the positive electrode or the lipo battery 3s is reacted by side reactions; the main factors affecting the self-discharge of the lipo battery 3s are the resting time of the lipo battery 3s and the thickness of the lipo battery 3s diaphragm.
More information is continuously updated.
Past highlights:
lipo battery 3s self-discharge dry goods!