Thermal Analysis of Lithium Batteries
| Autor: | Shin-Chih Chen, 陳欣志 |
|---|---|
| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 Two precise thermal models for prismatic and spirally wound lithium batteries have been developed to investigate the thermal behavior of battery discharge. The geometric characteristics, interface behavior, boundary conditions and component properties were carefully considered to ascertain the reliability of the model. Besides the scientific research, several simplified thermal models aimed at the practical applications are also developed, and the validity is further certified by the detailed thermal model. These models were used to study the effects of design parameters and operating variables upon the thermal behavior of lithium batteries. The simulation results of prismatic lithium batteries show that the temperature distribution inside a battery is asymmetrical, and the maximum temperature occurs somewhere below the center of a battery. Furthermore, radiation was found to be an important factor, and it contributes up to 63% of the total heat dissipation. The results also indicates that strong forced convection is effective in suppressing the maximum temperature, and the temperature uniformity does not decrease continuously when the extent of forced convection is enhanced. For the analysis of spirally wound lithium batteries, the results show that the maximum temperature locates at a circular region near the hole but not at the exact center. The contribution of radiation on heat transfer is as large as that found in prismatic lithium batteries, and applying the forced convection can remove more than half the heat generated during discharge. The results also show that materials with high thermal conductivity are recommended for use as battery case. Furthermore, the thermal behavior of a battery under a cross flow can be roughly examined under a parallel flow with the average heat transfer coefficient to avoid the complicity. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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