The topic of this article: Lithium battery charging principle, the difference between a constant voltage and constant current power supply and a lithium battery charger. Can a constant voltage and constant current power supply replace the lithium battery charger?
As we all know, lithium battery charging requires constant current charging. When the battery voltage reaches a certain value, it enters constant voltage charging mode. So why should constant current be followed by constant pressure? 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. Due to the increase in polarization of the internal resistance, the electrode Potential deviation. At this time, it is necessary to enter constant voltage charging. As 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 .
The design of the lithium battery charger fully meets the needs of lithium battery charging. So, can a constant voltage and constant current power supply replace the lithium battery charger?
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. Effectively prevent overcharging.
The difference between lithium battery charger and constant voltage constant current power supply
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, and the constant voltage and constant current power supply cannot be monitored, so if a constant voltage and constant current power supply is selected to charge the lithium battery, the lithium battery There must be a protective plate.
Can a constant voltage and constant current power supply replace the lithium battery charger? Where are the advantages?
In summary, it is possible to replace the lithium battery charger with a constant voltage and constant current power supply to charge the lithium battery. The main advantage lies in the centralized charging of lithium batteries, such as the serial or parallel charging of multiple lithium batteries, which is convenient and fast and saves time.
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