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research-article

Parameterization of Battery Electro-Thermal Models Coupled with Finite Element Flow Models for Cooling

[+] Author and Article Information
Nassim A. Samad

ASME Member Department of Mechanical Engineering University of Michigan Ann Arbor, Michigan 48109
nassimab@umich.edu

Boyun Wang

Department of Mechanical Engineering University of Michigan Ann Arbor, Michigan 48109
bywang@umich.edu

Jason B. Siegel

Research Scientist Department of Mechanical Engineering University of Michigan Ann Arbor, Michigan 48109
siegeljb@umich.edu

Anna G. Stefanopoulou

ASME Fellow William Clay Ford Professor of Manufacturing Professor of Mechanical Engineering Automotive Research Center Director University of Michigan Ann Arbor, Michigan 48109
annastef@umich.edu

1Corresponding author.

ASME doi:10.1115/1.4035742 History: Received October 06, 2015; Revised December 19, 2016

Abstract

Developing and parameterizing models that accurately predict the battery voltage and temperature in a vehicle battery pack is challenging due to the complex geometries of the airflow that influence the convective heat transfer. This paper addresses the difficulty in parameterizing low order models which rely on coupling with finite element simulations. First we propose a methodology to couple the parameterization of an equivalent circuit model (ECM) for both the electrical and thermal battery behavior with a finite element model (FEM) for the parameterization of the convective cooling of the airflow. In air cooled battery packs with complex geometries and cooling channels, an FEM can provide the physics basis for the parameterization of the ECM that might have different convective coefficients between the cells depending on the airflow patterns. The second major contribution of this work includes validation of the ECM against data collected from a 3-cell fixture that emulates a segment of the pack with relevant cooling conditions for a hybrid vehicle. The validation is performed using an array of thin film temperature sensors covering the surface of the cell. Experiments with pulsing currents and drive cycles are used for validation over a wide range of operating conditions (ambient temperature, state of charge, current amplitude and pulse width).

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