A brief analysis of the charging process of -Lithium - Ion Battery Equipment

A brief analysis of the charging process of lithium batteries -Lithium - Ion Battery Equipment

Lithium Ion Battery

The positive data of lithium-ion batteries are usually composed of the active compound of lithium, while the negative electrode is carbon with a special molecular structure. A common important component of the positive data is LiCoO2. During charging, the potential on the electrode causes the compound of the positive electrode to release lithium ions, and the molecules of the negative electrode intercalate into the carbon in a sheet-like structure. When the lithium ions are discharged, the lithium ions are separated from the layered carbon and combined with the anode compound. Although the principle of the chemical reaction is very simple, in actual industrial production, there are still many practical issues to be considered: the data of the positive electrode additive should adhere to repeated charging activities, and the data of the negative electrode should contain more lithium ions at the molecular structure design level ; The electrolyte filled between the positive electrode and the negative electrode, in addition to stability, also has good electrical conductivity, which reduces the resistance of the battery.(Lithium - Ion Battery Equipment)

Lithium-ion batteries are generally equipped with processing chips and charge control chips. Among them, there are a series of registers in the processing chip, including values ​​such as capacity, temperature, ID, charging state, and discharging time. These values ​​gradually change in use. The important function of charging and discharging about once a month in the application note is to correct the inappropriate values ​​in these registers, so that the charge control and nominal capacity of the battery match the actual condition of the battery. The charging control chip firstly controls the charging process of the battery. The charging process of the lithium-ion battery is divided into two stages: the constant current fast charging stage (the battery indicator light is yellow) and the constant voltage current drop stage (the battery indicator light is green).

In the constant current fast charging stage, the battery voltage is gradually increased to the standard voltage of the battery, and then transferred to the constant voltage stage under the control chip. The voltage is no longer added to ensure that overcharging does not occur. As the power of the battery increases, the current gradually decreases to zero, and the charging is finally completed. The battery computing chip samples the power of the battery by recording the discharge curve (voltage, current, time), which is the wh value we read the battery information. However, after the lithium-ion battery is used repeatedly, the discharge curve will change. If the chip never has a chance to read a good discharge curve, the calculated power will be inaccurate. So we need a deep charge to calibrate the battery chip.



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