Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 50 for “"Thermal runaway"”.
-
Methodology for Pyrolysis-induced Thermal Runaway Analysis in Li-ion Batteries
… which have traditionally been tools in polymer thermal analysis since the 1950s, have seen increasing use in LIB thermal research in recent decades. However, applying these techniques to LIBs poses challenges due to the multifaceted composition of LIBs and its sensitivity to environmental …
-
Experimental and Theoretical Study of Microwave Heating of Thermal Runaway Materials
… energy. One of these problems is called thermal runaway, which is a type of thermal instability due to the interaction between the electromagnetic waves and materials. As thermal runaway occurs, the temperature of the heated material rises uncontrollably. The normal consequence of thermal …
-
Experimental Testing and Numerical Modelling of Thermal Runaway in 18650 Lithium-Ion Batteries
… However, damaged or abused LIBs can undergo thermal runaway (TR), a rapid exothermic process causing high temperatures in seconds, and often resistant to conventional fire suppression systems. A deeper understanding of TR is vital for developing effective mitigation strategies. This research …
-
Role of electric field profiles in continuous microwave processing of thermal runaway materials
… better energy efficiency, but also diminishing thermal gradients inside the materials, producing more uniform heating, and therefore better mechanical properties. However, the strong temperature dependence of the ability to store or absorb the microwave energy of the material, and its variation …
-
Machine Learning and Data-Driven Analysis of Thermal Runaway Characteristics in Lithium-Ion Batteries
This study explores thermal runaway in lithium-ion batteries, particularly examining NCM (Nickel Cobalt Manganese) and NCA (Nickel Cobalt Aluminum) chemistries. Utilizing data analysis and machine learning on approximately 400 data points, it gives insights into thermal runaway dynamics, focusing …
-
Experimental Verification for Microwave Processing of Materials in a Single Mode Rectangular Resonant Cavity
… creating uncontrollable heating, often called 'thermal runaway'. The focus of this research is to address this challenge. The work described here is an experimental program for the microwave processing of specific ceramic rods and polymer tows. The objective of the program is to study the …
-
Modeling temperature distribution in cylindrical lithium ion batteries for use in electric vehicle cooling system design
… ion batteries will experience what is known as thermal runaway. During thermal runaway, the temperature of the battery increases uncontrollably and fires and explosions can occur. For this reason, adequate thermal management is a necessity in bringing lithium ion battery powered vehicles to …
-
3-D temperature distributions in spot heating of a ceramic by a focused microwave source
… field power requirements, uniform heating, and thermal runaway. The partial differential equation from the mathematical model was solved numerically with an implicit finite-difference method. Using experimentally measured dielectric loss properties for alumina, the required electric field …
-
Simulation of Microwave Heating of Mullite Rods
… which makes the material more susceptible to thermal runaway. The purpose of this research is to develop a model that accurately reproduces experimental data and can be used to explore new applicator designs for continuous processing of such ceramics. A two-dimensional numerical model, created …
-
Field Simulation for the Microwave Heating of Thin Ceramic Fibers
… avoid destructive phenomena such as cracking and thermal runaway. Thermal runaway is a potential problem in materials with temperature dependent dielectric properties. As the material absorbs electromagnetic energy, the temperature increases as does its ability to absorb more energy. Controlled …
-
Predictive Modeling for Assessing the Reliability of Bypass Diodes in Photovoltaic Modules
… failure mechanisms in bypass diodes such as thermal runaway, high temperature forward bias operation and thermal cycling are discussed. Operation of bypass diode under shading is modeled and method for calculating the module I-V curve under any shading scenario is presented. Frameworks for …
-
Material characterization of lithium ion batteries for crash safety
… as laptops and cell phones. Several cases of thermal runaway in lithium ion batteries that resulted in fires have been reported recently. And in the case of vehicle batteries, deformation during a crash event could cause an internal short circuit, leading to thermal runaway, fires, or toxic …
-
Assessment of fire and explosion hazards in large-scale battery energy storage systems intended for Namibian green hydrogen projects
… in lithium-ion batteries, leading to thermal runaway, like electrical faults, and mechanical damage. It also examines various battery chemistries and their respective safety profiles, alongside an analysis of global case studies to draw lessons for Namibia. Fault Tree Analysis (FTA) …
-
A Multi-Region Multi-Timescale Burning Plasma Dynamics Model for Tokamaks
… reaction rate and may conceivably lead to a thermal runaway instability. Meanwhile, core electrons lose energy to the edge plasma and wall through electron cyclotron radiation, bremsstrahlung, impurity radiation, and transport; and core ions lose energy through transport to the edge and ion …
-
Capacity Fade Analysis and Model Based Optimization of Lithium-ion Batteries
… damage, capacity fade, and the potential for thermal runaway. This dissertation contributes to the efforts in the modeling, simulation and optimization of lithium-ion batteries and their use in the design of better batteries for the future. While physics-based models have been widely developed …
-
Material characterization of high-voltage lithium-ion battery models for crashworthiness analysis
… element models and explore the mechanisms of thermal runaway caused by internal short circuit. In phase one, medium and large sized cells at low state of charge (SOC) were impacted or compressed while measuring punch load, displacement, cell voltage, and surface temperature until an internal …
-
An electrical network model for computing current distribution in a spirally wound lithium ion cell
… because of heating issues that may lead to thermal runaway. This work aims at supplementing the existing electrochemical heat distribution model of a spirally wound lithium ion battery with an electrical network that can model the heat losses due to electric resistances of the current …
-
Performance analysis of high power photoconductive switch at elevated temperature
… shows that filamentary conduction results in thermal runaway that severely affects and damages the device as the breakdown voltages had been observed to be much less than the operating voltages of the switches. Further simulations were also done on a 6H-SiC photoconductive semiconductor switch …
-
Thermal stability criteria embedded in avanced control systems for batch process intensification
Thermal stability of batch processes is a major factor for the safe and efficient production of polymers and pharmaceutical chemicals. The prediction of thermal stability for such nonlinear, non steady-state processes is unreliable when using most stability criteria found in literature. A new …
-
Radio frequency interference (RFI) modeling of complex modules in mobile devices and system-level modeling for transient ESD simulation
… determine if a junction would experience thermal runaway under an arbitrary injection waveform"--Abstract, page iv.</p>
Page 1 of 3