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The lithium battery charger and the constant current and constant voltage charging


Lithium battery charging requires constant current charging. When the battery voltage reaches a certain value, it enters constant voltage charging mode.

The lithium battery charger and the constant current and constant voltage charging
 
Today, Let us explore this problem that does the lithium battery charger can be instead of the constant current and constant voltage charging or not?
battery charger
Lithium battery charging requires constant current charging. When the battery voltage reaches a certain value, it enters constant voltage charging mode. But why it needs constant current first, and then constant voltage? In fact, whether it is constant voltage or constant current, the principle is to "activate". The constant current charging mode can make the reaction proceed with a stable and large current. As the reaction progresses to a certain extent, a film will be formed on the surface of the electrode. At this time, the internal resistance increases. With the increasing in internal resistance polarization, it will be caused the electrode potential deviation. At this time, it is necessary to enter constant voltage charging. With the charging continues, the reverse electromotive force begins to increase, the total electromotive force of the entire circuit is decreasing, the circuit current gradually decreases, and the polarization voltage becomes weaker until the termination of accurate control charging .
lithium battery charger
 
Lithium battery charging process
The design of the constant current and constant voltage power supply is fully match with lithium battery charging. The question is, does the lithium battery charger can be instead of the constant current and constant voltage charging?
 
The constant voltage and constant current power supply is a kind of switching power supply. The difference from the switching power supply is that there are two circuits of constant voltage and constant current inside the constant voltage and constant current power supply. The output voltage and current can be continuously adjusted from 0 to the rated value. The constant current working mode will automatically switch in actual work; the lithium battery charger is essentially a constant voltage and constant current power supply with a constant output current, which does not change with the grid voltage and load, and most of them have circuits to continuously monitor the battery voltage, to prevent overcharging effectively.
 
The difference between a lithium battery charger and a constant voltage and constant current power supply is that the lithium battery charger has the function of monitoring the battery voltage, but the constant voltage and constant current power supply cannot be monitored. It must be a protective plate if use the constant voltage and constant current power supply to be charged for the lithium battery.
 
It is possible to replace the lithium battery charger with a constant voltage and constant current power supply to charge the lithium battery. Its main advantage lies in the centralized charging of lithium batteries, such as serial or parallel charging of multiple lithium batteries, which is convenient and fast and saves time.

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