Design of wireless real time monitoring lithium ion battery charger using constant current constant voltage method

Li-Ion battery is the main power source for portable devices and electric vehicles because of their excellent characteristics. After being used to supply energy, Li-Ion batteries will reduce their energy capacity and need to be charged so that the battery returns to its maximum capacity. There are several methods for charging a battery, one of the methods is Constant Current Constant Voltage (CC-CV). This method provides a a constant current first and continuing with constant voltage under certain conditions. This method is suitable for Li-Ion battery because the age of Li-Ion battery is greatly affected by overcharging conditions so that using this method can extend battery life. In this research, Li-Ion battery charger will be designed using the Buck Boost converter topology with the CC-CV method. Real time monitoring system during the battery charging process will also be proposed. In the implementation, the Buck Boost converter has an average efficiency of 88.2% at 10% to 100% load condition. The CC-CV method has high reliability in maintaining constant charging voltage and current and can produce a constant current of 1.3 A and a constant voltage of 12.6 V. In the Li-Ion battery charging test, it was found that the entire charging process took 89 minutes with 56 minutes in Constant Current mode and 33 minutes in the Constant Voltage mode with a cut-off current of 180 mA. The parameters of the Li-Ion battery such as charging voltage and current, the voltage between cells and the State of Charge will be updated every second so that it is monitored in real time wireless.