University of Twente Student Theses


Numerical Investigation On The Thermal Behavior Of Li-ion Batteries Under Various Cooling Methods

Patel, A. (2023) Numerical Investigation On The Thermal Behavior Of Li-ion Batteries Under Various Cooling Methods.

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Abstract:In this study, thermal management of the lithium-ion (Li-ion) battery pack for low-range applications such as E-bikes, electric scooters, solar equipment, etc. is contemplated. A major problem related to batteries operating at a high temperature which leads to thermal runaway has been studied. Various stages of the thermal runaway are discussed briefly. Safety issues associated with Li-ion batteries such as the causes that lead to thermal, mechanical, and electrical abuse, how they impact the battery structure and further lead to thermal runaway have been discussed in the study. The extreme working conditions and uneven distribution of the temperature, affect the effectiveness and the battery life, the focus of the study is to examinate the thermal behaviour of cylindrical Li-ion batteries and the optimization of the parameters to achieve a reduced temperature in the batteries and uniformity across the battery pack during the discharging operation. To ensure that the battery pack operates in the range of optimal working temperature of 15oC to 40oC delivering better performance with safety, thermal analysis is performed on the batteries. A 52V 18Ah Li-ion battery pack is used and to simplify the computation and reduce its time, two modules of 4S1P are subjected to various cooling scenarios. The study uses Ansys - Computational Fluid Dynamics (CFD) to set the thermal model and execute the simulations under varied parameters like cell spacing, ambient temperatures, inlet velocities (in the case of forced convection), discharge rates, etc. The findings in the study depict that the temperature of the batteries is drastically reduced when natural convection and forced convection cooling are compared. After analyzing the cooling performance of the forced convection, cooling of the battery modules with the use of phase change materials (PCM) is investigated. The results show that the phase change material provides more uniformity in the temperature throughout the modules lowering the overall temperature of the battery pack.
Item Type:Essay (Master)
Fraunhofer Innovation Platform, Enschede, Netherlands
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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