Design of Overcharging Protection and Passive Balancing Circuits Using Dioda for Lithium-Ion Battery Management System

Currently, the type of battery that is widely used is a Lithium material battery. Lithium batteries have high power density than other materials, however lithium material is very toxic and dangerous, hence it requires special handling for operation. In this paper, a battery management system which can protect and do passive balancing of the battery from overcharging are carried out. The overcharging protection circuit is tested by monitoring the voltage and current values of each battery cell when it is charged, simultaneously. While the passive balancing circuit is conducted only by measuring the voltage value of each battery cell. Based on the measurements, the proposed circuit is able to protect from overcharging and to balance each battery cell at a voltage of 3.75 Volt with a charging current of 0.2 Ampere.