THERMAL CHARACTERISTICS OF A SERIES CONNECTED BATTERY ARRAY

• Main Author: Silviyani Puteri, Adinda
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/75846
• Institution: Institut Teknologi Bandung

Lithium-ion batteries are widely used as an energy source for electric vehicles due to its specifications. However, temperature is a major problem for lithium-ion batteries and identified as a critical factor affecting battery performance. Therefore, to maintain battery temperature within a safe operational area it is essential to design an efficient battery thermal management system (BTMS) and it is said that an accurate battery thermal model is one of the keys to a thermal management system. The experiment and simulation in this study were conducted to understand the thermal characteristics of a series-connected battery array while being charged and discharged under the influence of different currents. This study is a continuation of a pervious study, the differences are, in this study, we collect data of voltage and current to determine the heat generated by the battery. The temperature rises during both charging and discharging processes, with higher temperatures when operated at 3000 mA for 1 hour (1C rate) compared to 1500 mA for 2 hours (0.5C rate). Battery 2 (middle) exhibits the highest temperature, while battery 3 (right side) has the lowest due to polarization. The battery's maximum temperature occurs at the side adjacent to another battery, except in the 0.5C charging experiment. During discharge, the battery temperature is higher due to exothermic reactions. From simulations, higher temperatures are observed at a 1C rate compared to 0.5C rate, with battery 2 having the highest temperature and battery 3 the lowest during discharging. In charging simulations, battery 2 has the highest temperature and battery 1 (left side) the lowest. The maximum temperature occurs at the side of the battery adjacent to another. The discharging simulation aligns well with the experimental results, but there are some differences in temperature distribution along the horizontal line. The charging simulation does not match the experimental results, and the simulation temperature on the side of the cell increases significantly due to the thin air model.