| Summary: | 碩士 === 華梵大學 === 機電工程學系博碩專班 === 99 === In this thesis, the computational fluid dynamics software CFD-RC is used to establish a three-dimensional numerical heat transfer model of the lithium-ion battery with different arrangement of Lithium-ion battery modules with various gaps between lithium-ion battery cell of lithium-ion battery module, volume heat generation rate and heat transfer cooling rate. With the predicted results under different conditions, these would be useful for the design of lithium-ion cells in an electric vehicle.
The volume heat generation rate stands for the heat generation of lithium-ion cells during charge or discharge. The higher the heat generation rate, the lower efficiency of the lithium-ion cells during charge or discharge. Under this condition, the temperature rise in the lithium-ion cells would be considerable. Therefore, the detailed consideration of the temperature distributions should be examined in the lithium-ion cells of an electric vehicle. Due to the natural convection effects in the enclosure of lithium-ion cells and the external cooling of the enclosure of lithium-ion cells, the arrangement of lithium-ion cells become be important. The predicted results showed that with the assistance of the approximate arrangement of the cells, the lower temperature rise would be encountered. In addition, the higher external cooling rate (higher heat transfer coefficient), the lower temperature rise in the cells is noted. In addition, higher temperature rise is experienced for the case with larger volume heat generation rate. As for the gap effects, in general, a lower temperature rise is encountered for a case with a larger gap. But for the SP-type arrangement, this is not the case for the gas effects.
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