Modeling Li-ion Battery Temperature and Degredation
Department
Mechanical and Aerospace Engineering
Major
Mechanical Engineering
Research Advisor
Park, Jonghyun
Advisor's Department
Mechanical and Aerospace Engineering
Abstract
An ideal battery model must gather sufficient electrochemical data about the battery system while remaining computationally efficient. To prevent failure from thermal runaway and protect the battery health, understanding the thermal characteristics of a battery throughout its lifespan is essential, particularly for 3D applications in a battery pack.
To achieve this, a single particle battery model was coupled with a 3D heat generation component to simulate the heat generation and 3D heat transfer in a cell. Mathematical modeling equations were used to predict the growth of the solid electrolyte interphase (SEI) layer, the primary contributor to degradation. This cell model was applied to a 6-cell pack to observe pack heat transfer during degradation.
To validate this model, a 6-cell battery pack was created and tested experimentally. From this experimental data, parameter estimation was performed to understand the composition of each cell. This pack was then recreated and simulated to provide a reference for the battery model.
The results indicate a parabolic SEI thickness growth when cycling. This resulted in non-linear capacity loss, and due to the corresponding increase in cell resistance from SEI growth, the heat generation increased as the battery degraded. The 3D pack temperature was highest at the center of the pack due to heat transfer with surrounding cells.
Biography
Derrick Barger is a senior mechanical engineering student that is passionate about reducing humanity's reliance on fossil fuels. He has conducted research focused on battery modelling and simulation under the guidance of Dr. Jonghyun Park since the spring of 2020. Derrick became interested in this project because of the unique challenges associated with engineering in extreme temperature environments, particularly ultra-cold environments. After learning about the research process as an undergraduate student at Missouri S&T, he plans on pursuing his master's degree in cold climate engineering at the Arctic University of Norway in Tromso.
Presentation Type
OURE Fellows Final Oral Presentation
Document Type
Presentation
Location
Ozark Room
Presentation Date
14 Apr 2022, 9:00 am - 9:30 am
Modeling Li-ion Battery Temperature and Degredation
Ozark Room
An ideal battery model must gather sufficient electrochemical data about the battery system while remaining computationally efficient. To prevent failure from thermal runaway and protect the battery health, understanding the thermal characteristics of a battery throughout its lifespan is essential, particularly for 3D applications in a battery pack.
To achieve this, a single particle battery model was coupled with a 3D heat generation component to simulate the heat generation and 3D heat transfer in a cell. Mathematical modeling equations were used to predict the growth of the solid electrolyte interphase (SEI) layer, the primary contributor to degradation. This cell model was applied to a 6-cell pack to observe pack heat transfer during degradation.
To validate this model, a 6-cell battery pack was created and tested experimentally. From this experimental data, parameter estimation was performed to understand the composition of each cell. This pack was then recreated and simulated to provide a reference for the battery model.
The results indicate a parabolic SEI thickness growth when cycling. This resulted in non-linear capacity loss, and due to the corresponding increase in cell resistance from SEI growth, the heat generation increased as the battery degraded. The 3D pack temperature was highest at the center of the pack due to heat transfer with surrounding cells.
