Battery management systems may be as simple as electronics to measure voltage and stop charging when the desired voltage is reached. At that point, they might shut down the power flow; in the event of irregular or dangerous conditions they might issue an alarm. 

Lithium-ion batteries are now very popular. Now-a-Days these batteries are used in maximum devices. But unlike other types of batteries, for example,  lead-acid or nickel batteries, lithium-ion batteries are very demanding for the charger parameters. Battery management system lithium ion batteries (Like 18650 Batteries) is very important.

If you don’t control the process of charging and discharging of Lithium-ion batteries, they will fail soon. These batteries can swell and even explode from overcharging, and a deep discharge can cause of battery failure.

The ideal charger for lithium-ion batteries should have a stabilizing unit for voltage and current and also a voltage balancing system for banks. The voltage of the fully charged can of lithium-ion the battery is 4.2 Volts.

As soon as the battery has reached this voltage, the charging process should stop. Today we will examine a circuit that will allow charging lithium-ion cans connected in series, as well as balancing them in the process of charging. This circuit is not only simple but also very effective.