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Critical thickness of nano-enhanced RT-42 paraffin based battery thermal management system for electric vehicles: A numerical study

电池(电) 相变材料 材料科学 工作温度 核工程 功率密度 热的 热能储存 泄流深度 储能 锂离子电池 复合材料 汽车工程 功率(物理) 电气工程 热力学 工程类 物理
作者
Aditya R. Bais,Dattataraya G. Subhedar,Satyam Panchal
出处
期刊:Journal of energy storage [Elsevier]
卷期号:52: 104757-104757 被引量:77
标识
DOI:10.1016/j.est.2022.104757
摘要

Use of electric vehicles has increased worldwide. Lithium Ion (Li-Ion) batteries are widely used to power them due to their high energy density and low self-discharge rates as compared to other conventional batteries such as lead acid. But at 3C discharge rates (where 3C means 3 times the rated Ah capacity of the battery cell), there is a sharp rise in temperature which impacts battery cell performance. After temperature exceeding 50 °C, the Li-Ion battery cells become unstable and catch fire and thus, its thermal management became a priority. Battery thermal management system (BTMS) aims to control battery cell temperature within operating limits at high discharge rates and ambient temperatures. BTMS utilizes either a fluid medium to carry away heat or working material in the form of Phase Change Material (PCM). In the present numerical investigation RT-42 paraffin is used as working material to control battery temperatures. In this investigation the performance of RT-42 paraffin for different thicknesses ranging from 1 mm to 7 mm around the battery cell was used to control battery temperature effectively. It is observed that up to 4 mm thickness of RT-42 paraffin gain in controlling the temperature is maximum. But low thermal conductivity of pure RT-42 impacts on its heat transfer performance. Therefore investigation of performance of Al2O3/RT-42 paraffin nano PCM (NePCM) with percentage weight fractions of 0.5, 1, 2, and 5 at critical thickness 4 mm was carried out. NePCM was able to maintain the maximum battery temperature 42.77 °C and remains in partially liquefied state at the end of discharge cycle of 1200 s.
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