Rancang Bangun Sistem Pengukuran Resistansi Internal dan Open Circuit Voltage (OCV) Berbasis Pulse Load pada Modul Baterai LiFePO4

Fathoni, Muhammad Raihan (2026) Rancang Bangun Sistem Pengukuran Resistansi Internal dan Open Circuit Voltage (OCV) Berbasis Pulse Load pada Modul Baterai LiFePO4. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Baterai lithium iron phosphate (LiFePO4) banyak digunakan pada sistem penyimpanan energi bersih karena memiliki stabilitas termal yang baik, umur siklus panjang, dan keselamatan operasi yang tinggi. Penelitian ini bertujuan merancang dan mengevaluasi sistem pengukuran open-circuit voltage (OCV) dan resistansi internal berbasis metode pulse load pada modul baterai LiFePO4. Sistem mengintegrasikan sensor INA226 dengan external shunt, ESP32-S3, MOSFET, lampu halogen sebagai beban uji, dan Microsoft Excel sebagai media pencatatan serta pengolahan data. Pengujian dilakukan dalam dua tahap, yaitu pengujian statis pada state of charge (SoC) 100%, 80%, dan 60%, serta pengujian dinamis pada SoC 80% dengan variasi pulse time 50–500 ms dan rest time 3–60 s. Hasil pengujian statis menunjukkan bahwa OCV menurun dari 14,0018 V pada SoC 100% menjadi 13,3432 V pada SoC 80% dan 13,2158 V pada SoC 60%. Setelah faktor kalibrasi global diterapkan, resistansi internal hasil sistem masing-masing sebesar 57,6360 mΩ, 54,9022 mΩ, dan 53,7942 mΩ. SoC 100% digunakan sebagai titik acuan kalibrasi, sedangkan error relatif pada SoC 80% dan 60% masing-masing sebesar 4,6241% dan 4,4916%. Pada pengujian dinamis, hasil terbaik diperoleh pada pulse time 500 ms dan rest time 20 s, dengan resistansi internal sistem sebesar 57,487 mΩ, nilai IR Meter sebesar 57,476 mΩ, error relatif 0,019%, dan rata-rata konstanta waktu efektif sebesar 46,9482 ms. Hasil penelitian menunjukkan bahwa sistem mampu mengukur OCV, merekam respons tegangan dan arus, serta mengestimasi resistansi internal dengan kesesuaian relatif yang baik terhadap alat pembanding praktis. Sistem ini mendukung karakterisasi baterai untuk aplikasi penyimpanan energi bersih dan relevan terhadap SDG 7 serta SDG 9.
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Lithium iron phosphate (LiFePO4) batteries are widely used in clean energy storage systems because of their good thermal stability, long cycle life, and operational safety. This study aimed to design and evaluate an open-circuit voltage (OCV) and internal resistance measurement system based on the pulse-load method for a LiFePO4 battery module. The system integrated an INA226 sensor with an external shunt, an ESP32-S3, a MOSFET, a halogen lamp as the test load, and Microsoft Excel for data recording and processing. Testing was conducted in two stages: static tests at state-of-charge (SoC) levels of 100%, 80%, and 60%, and dynamic tests at 80% SoC using pulse times of 50–500 ms and rest times of 3–60 s. The static test results showed that OCV decreased from 14.0018 V at 100% SoC to 13.3432 V at 80% SoC and 13.2158 V at 60% SoC. After applying a global calibration factor, the internal resistance values measured by the system were 57.6360, 54.9022, and 53.7942 mΩ, respectively. The 100% SoC condition was used as the calibration point, while the relative errors at 80% and 60% SoC were 4.6241% and 4.4916%, respectively. The best dynamic result was obtained at a pulse time of 500 ms and a rest time of 20 s, yielding a system-measured internal resistance of 57.487 mΩ, an IR meter value of 57.476 mΩ, a relative error of 0.019%, and a mean effective time constant of 46.9482 ms. These results demonstrate that the system can measure OCV, record voltage and current responses, and estimate internal resistance with good relative agreement with a practical comparison instrument. The system supports battery characterization for clean energy storage applications and is relevant to SDGs 7 and 9.

Item Type:	Thesis (Other)
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2921 Lithium cells. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2941 Storage batteries T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK351 Electric measurements.
Divisions:	Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Raihan Fathoni
Date Deposited:	03 Aug 2026 04:06
Last Modified:	03 Aug 2026 04:09
URI:	http://repository.its.ac.id/id/eprint/142122

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