An introduction to heat transfer

Introduction to heat transfer

Thermal issues about Li-ion batteries and recent progress in battery thermal management systems: A review

A critical review of battery thermal performance and liquid based battery thermal management

Phase entropy as a function of lithium filling in the layered oxide S = KB ln(Ω) , Boltzman configuration entropy With Ω the configuration multiplicity (number of ways the inserted lithium cations could be arranged in the host lattice). Under the reasonable assumption of indistinguishable lithium cations, the configuration multiplicity of N lithium cations into the host material with Ns effective total number of sites follows the combinatorial equation below: Notes by MIT Student (and MZB)

Lithium Ion Batteries

Experimental and theoretical analysis of a method to predict thermal runaway in Li-ion cells

Experimental and numerical investigation of core cooling of Li-ion cells using heat pipes

https://escholarship.org/content/qt4794p4mt/qt4794p4mt.pdf?t=qzf8se

A review of thermal physics and management inside lithium-ion batteries for high energy density and fast charging

Author(s): Chalise, D; Shah, K; Prasher, R; Jain, A | Abstract: Thermal management of Li-ion battery packs is a critical technological challenge that directly impacts safety and performance. Removal of heat generated in individual Li-ion cells into the ambient is a considerably complicated problem involving multiple heat transfer modes. This paper develops an iterative analytical technique to model conjugate heat transfer in coolant-based thermal management of a Li-ion battery pack. Solutions for the governing energy conservation equations for thermal conduction and convection are derived and coupled with each other in an iterative fashion to determine the final temperature distribution. The analytical model is used to investigate the dependence of the temperature field on various geometrical and material parameters. This work shows that the coolant flowrate required for effective cooling can be reduced significantly by improving the thermal conductivity of individual Li-ion cells. Further, this work helps understand key thermal-electrochemical trade-offs in the design of thermal management for Li-ion battery packs, such as the trade-off between temperature rise and energy storage density in the battery pack.

/pdf/conjugate-heat-transfer-analysis-of-thermal-management-of-a-2wqcdg635a.pdf

Conjugate Heat Transfer Analysis of Thermal Management of a Li-Ion Battery Pack

While additive manufacturing offers significant advantages compared to traditional manufacturing technologies, deterioration in thermal and mechanical properties compared to properties of the underlying materials is a serious concern. In the context of polymer extrusion based additive manufacturing, post-process approaches, such as thermal annealing have been reported for improving mechanical properties based on reptation of polymer chains and enhanced filament-to-filament adhesion. However, there is a lack of similar work for improving thermal properties such as thermal conductivity. This paper reports significant enhancement in build-direction thermal conductivity of polymer extrusion based parts as a result of thermal annealing. Over 150% improvement is observed when annealed at 135 °C for 96 h. The effect of annealing temperature and time on thermal conductivity enhancement is investigated through experiments. A theoretical model based on Arrhenius kinetics for neck growth and a heat transfer model for the consequent impact on inter-layer thermal contact resistance is developed. Predicted thermal conductivity enhancement is found to be in good agreement with experimental data for a wide range of annealing temperature and time. The theoretical model may play a key role in developing practical thermal annealing strategies that account for the multiple constraints involved in annealing of polymer parts. This work may facilitate the use of polymer extrusion additive manufacturing for producing enhanced thermal conductivity parts capable of withstanding thermal loads.

Divya Chalise

Papers

Experimental and theoretical analysis of a method to predict thermal runaway in Li-ion cells

Experimental and numerical investigation of core cooling of Li-ion cells using heat pipes

A review of thermal physics and management inside lithium-ion batteries for high energy density and fast charging

Conjugate Heat Transfer Analysis of Thermal Management of a Li-Ion Battery Pack

Improvement in build-direction thermal conductivity in extrusion-based polymer additive manufacturing through thermal annealing