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Evaluation of Indirect Liquid Cooling for Electric Vehicle Battery Thermal Management System

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Abstract
Green-powered electric vehicles are reliable substitutes to lessen greenhouse gas emissions and reliance on fossil fuels. Electric vehicles are now extensively used worldwide, and this will be high in the future. The battery pack is the key feature of an electric vehicle. The battery pack's performance and life are incredibly temperature-sensitive, a problem related to battery thermal management. So, it is mandatory to keep the optimal temperature range for smooth performance and safety.
This study evaluates the coolant cooling system for the thermal management of 45kWh and 64 kWh battery packs, respectively. A chiller and radiator are employed to cool the operating fluid, combining water and ethylene glycol with the 50:50 ratio. A thermal-fluid simulation executed using a standard commercial tool known as GT Suite, and the battery pack temperature experiment using a vehicle was conducted to validate the simulation results. The results reveal that the proposed systems'performance typically improved by mproving the flow rate and the chiller power. It depicts that the cooling rate is maximum at 40 °C initial attery temperature and an ambient temperature of 25 °C with 3 kW chiller capacity and flow rate of 20 liters per minute (LPM) in the chiller cycle mode. While in the radiator cycle, the highest cooling rate is at an ambient temperature of 25 °C, an initial battery temperature of 40 °C with an airflow rate of 3600 cubic meters per hour (CMH), and a 30 LPM of coolant flow rate in both systems, respectively. Besides, a thermal management system of a 45 kWh battery pack was found better than a 64 kWh battery pack system in terms of cooling performance. In the future, the proposed BTMS could be a realistic solution and help develop the electric vehicles' thermal system.
Author(s)
Waseem Raza
Issued Date
2021
Awarded Date
2021. 2
Type
Dissertation
URI
https://oak.jejunu.ac.kr/handle/2020.oak/23490
Alternative Author(s)
와심, 라자
Affiliation
Jeju National University
Department
대학원 에너지응용시스템학부 Mechanical Engineering
Advisor
Park, Youn Cheol
Table Of Contents
Chapter 1 Introduction 3
1.1 Overview 3
1.2 Adverse Effect of Temperature on Lithium-ion Battery 4
1.2.1 Low Temperature 5
1.2.2 High Temperature . 6
1.2.3 Advised Temperature Range . 9
1.3 Battery Thermal Management System . 9
1.3.1 BTMS Selection Based on Medium 11
1.3.2 Indirect Cooling Method . 14
1.3.3 Cold Plate 14
1.4 Objective/Aim 16
1.5 Thesis Structure . 16
Chapter 2 Modeling, Simulation, and System Description. 18
2.1 Conservation Equations . 18
2.2 Required Operating Mode of Thermal System . 19
2.2.1 Chiller Mode . 21
2.2.2 Radiator Mode . 22
2.2.3 Heater Mode 23
2.3 Chiller . 24
2.4 Radiator 25
2.5 Battery Pack . 26
2.6 Cooling System 28
Chapter 3 Simulation Setup . 33
Chapter 4 Results and Discussion 36
4.1 45 kWh Battery Pack . 36
4.1.1 Cooling Cycle using Chiller for 45 kWh Battery Pack . 36
4.1.2 Cooling Cycle using Radiator for 45 kWh Battery Pack . 40
4.2 64 kWh Battery Pack . 43
4.2.1 Cooling Cycle using Chiller for 64 kWh Battery Pack . 43
4.2.2 Cooling Cycle using Radiator for 64 kWh Battery Pack . 46
Chapter 5 Comparison and Verification . 49
Chapter 6 Conclusions and Future Work 53
References
Degree
Master
Publisher
Graduate School of Jeju National University
Citation
Waseem Raza. (2021). Evaluation of Indirect Liquid Cooling for Electric Vehicle Battery Thermal Management System
Appears in Collections:
Faculty of Applied Energy System > Mechanical Enginering
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