Desain dan Implementasi Real Time Monitoring Charger Baterai Lithium – Ion Menggunakan Metode Constant Current Constant Voltage

Baterai Li - Ion menjadi sumber daya utama perangkat portabel dan kendaraan listrik karena karakteristiknya yang sangat baik. Setelah digunakan untuk menyuplai energi, baterai Li - Ion akan berkurang kapasitas energinya dan perlu dilakukan charging agar baterai kembali ke kapasitas maksimumnya. Ada beberapa metode untuk mengisi daya baterai, salah satu metodenya adalah Constant Current Constant Voltage (CC-CV) yaitu dengan memberikan arus konstan terlebih dahulu dan dilanjutkan tegangan konstan pada kondisi tertentu. Metode ini sesuai untuk baterai Li-Ion karena usia baterai Li-Ion sangat dipengaruhi oleh kondisi overcharging sehingga dengan menggunakan metode ini dapat memperpanjang usia baterai. Pada penelitian ini akan dirancang charger baterai Li - Ion menggunakan topologi konverter Buck Boost dengan metode CC-CV. Akan diusulkan juga sistem real time monitoring saat proses charging baterai. Pada Implementasinya, konverter Buck Boost memiliki efisiensi rata-rata 88,2% pada pembebanan 10% sampai 100%. Metode CC-CV memiliki reliabilitas tinggi dalam menjaga tegangan dan arus charging secara konstan dan dapat menghasilkan arus konstan 1,3 Ampere dan tegangan konstan 12,6 Volt. Pada pengujian charging baterai Li – Ion, didapatkan bahwa keseluruhan proses charging membutuhkan waktu selama 89 menit dengan rician 56 menit pada mode Constant Current dan 33 menit pada mode Constant Voltage dengan arus cut – off sebesar 180 mA. Parameter dari baterai Li - Ion seperti tegangan dan arus charging, tegangan antar sel dan State of Charge akan ter - update setiap detik sehingga terpantau secara real time. Kata kunci : Buck Boost, Lithium Ion, CC-CV, Real Time Monitoring =========================================================================================================== Li-Ion batteries are 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 batteries return to their maximum capacity. There are several methods for charging a battery, one of the methods is Constant Current Constant Voltage (CC-CV), namely by providing a constant current first and continuing with constant voltage under certain conditions. This method is suitable for Li-Ion batteries because the age of Li-Ion batteries 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 its implementation, the Buck Boost converter has an average efficiency of 88.2% at 10% to 100% load. The CC-CV method has high reliability in maintaining constant charging voltage and current and can produce a constant current of 1.3 Amperes and a constant voltage of 12.6 Volts. In testing the Li-Ion battery charging, it was found that the entire charging process took 89 minutes with a 56 minute 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. Key Word : Buck Boost, Lithium Ion, CC-CV, Real Time Monitorin