Why do lithium-ion batteries need to be pre-charged in the first place?

Many consumers don't understand why lithium-ion battery needs to be pre-charged. This is mainly because lithium-ion battery has higher energy ratio. If the battery directly accesses to quickly charge mode, it may damage the battery, affect the service life and may bring security issues.

Lithium electricity charging in advance

Although the lithium ion battery in the process of design, built-in line protection board, normally the battery overcharge had very little chance of filling, at first, but if the battery is not prefilled will bring a lot of concerns, such as protection board failure, long placed self-discharge rate, etc., when the battery discharge will lead to the recovery of active material is difficult, the first in small current charge to 2.5 V to 3.0 V, then into a quick charge is necessary. Preliminary charging small battery can effectively solve the problem of discharge the battery charge.

Lithium battery voltage from 2.5 V to 4.2 V at work, when the voltage is less than 2.5 V, the battery discharge is terminated, at the same time because the discharge loop closure to make internal protection circuit of current loss is reduced to a minimum, of course, due to the different internal material in the practical application, the discharging termination voltage in the range of 2.5 V to 2.5 V, when the voltage is greater than 4.2 V, the charging circuit is terminated, in order to protect the battery safety; When monomer battery voltage has dropped below 3.0 V, we can think after discharge, discharge circuit is terminated, to protect the security of the battery.

The consumer believes that they need to choose battery with large current for fast charge, but this is not correct. The greater the charging current is not the better. Taking the monomer of lithium-ion battery for example, the charging ways are including constant current, constant voltage charging process. Constant voltage tend to be 4.2 V, while constant current setting value is 0.1 C ~ 1 C. Although large current charging will shorten the charging time, it can also shorten life cycle and capacity of the battery. Therefore, experts advise consumers to correctly recognize the importance of battery charging in advance. The goal of lithium-ion battery in the design process is to solve the problems above. All in all, the new battery must be pre-charged, and select the appropriate constant current for battery charging.

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