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Theses

Études thermiques du stockeur d'énergie électrique automobile

Abstract : Lithium-ion batteries, characterized by their high energy and power density, are highly recommended as power sources for electrified vehicles (HEV/PHEV/EV). However, lithium-ion batteries are very sensitive to their environment and are prone to thermal runaway at high temperature. The goals of this thesis are to develop an accurate lithium-ion cell heat loss calculation method and to investigate the thermal performance of several cooling solutions for HEV/PHEV/EV batteries. The first part presents a global heat calculation procedure for lithium-ion cell which takes into account both the polarization heat and the entropic heat. This heat generation model was coupled with a cell two-dimensional thermal model in order to predict the cell’s temperature. Temperature estimations obtained by simulation for a 22 Ah LiNi0.8Co0.15Al0.05O2/graphite cell showed a very good agreement with experimental results. In the second part, thermal performances of several cooling solutions for HEV/PHEV/EV batteries (air, phase change material (PCM) and heat pipe) were evaluated experimentally under several heat rates and cooling conditions. Heat pipe cooling was found to be a promising cooling solution which works efficiently even under low rate ventilation cooling condition. The experimented PCM cooling system had very poor thermal performance, mainly due to the low thermal conductivity of the used PCM formulation. However, simulations showed that significant improvement could be achieved by using another alternative PCM formulation.
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Submitted on : Wednesday, December 1, 2021 - 3:17:08 PM
Last modification on : Thursday, December 2, 2021 - 3:50:02 AM

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TRAN_Thanh_Ha2.pdf
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Identifiers

  • HAL Id : tel-03461880, version 1

Citation

Thanh-Ha Tran. Études thermiques du stockeur d'énergie électrique automobile. Thermique [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambresis, 2014. Français. ⟨NNT : 2014VALE0009⟩. ⟨tel-03461880⟩

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