What is the danger of long-term storage of lithium batteries?

In the process of using lithium batteries, many people will store the battery after it is fully charged. However, this practice is not correct, and even has a great harm to the battery. So what are the hazards in doing so? Here is the technical staff of the manufacturer Yaluxing to explain to you:

During the use and suspension of the lithium battery, the battery continuously forms/consumes the SEI film, which will generate a negative electrode film-forming gas, which will cause flatulence (bulging); the internal crystal of the lithium battery is too active to cause the battery to swell (drum), the general reason The battery is overcharged, over discharge, charging current is too large, long-term full power storage; lithium battery internal crystal long-term activity is high, will make the battery slowly bulge, long time is full state, this chemical reaction has been At a faster rate, although the self-discharge rate of the battery is relatively low, the chemical reaction continues, and the reaction speed is faster than the terminal voltage of 3.8V.

Lithium batteries, regardless of their use or not, will inevitably lose capacity over time. This refers to the loss of irreversibility. Lithium battery starts from the factory, and the chemical reaction that causes capacity loss begins slowly. However, when the battery voltage is relatively high, the reaction is faster. Therefore, if the lithium battery is not used for a long time, the terminal voltage is 3.8V, so that the above reaction is not too fast, and the long-term storage does not cause a loss and over discharge, 3.8V. It is the result of comprehensive consideration, so the new factory's new lithium battery is mostly 3.7-3.9V.

The battery protection board in the lithium battery pack has more or less self-consumption current, so the inferior protection board is likely to increase the self-consumption current value, which will indirectly cause irreversible capacity loss of the battery. !

At the same time, the long-term storage of lithium batteries is full of drawbacks:

1, will increase security risks;

2. Accelerate battery aging;

Therefore, the manufacturer reminds everyone: Do not store the battery during the process of storing the battery, be sure to leave a little margin.

The page contains the contents of the machine translation.