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- W14810000 abstract "A two-dimensional mathematical model was developed to predict the temperature excursion of a single-module battery. For the eV application, however, a large number of cells or modules are often needed to power a vehicle of practical size. Generally the temperature rise in these modules will be higher than that of a single module. Significant temperature variation among cells and modules has also been observed. In order to accurately predict and subsequently to control the temperature of a full-size battery during its operation, a three-dimensional model capable of depiciting thermal interactions among cells and modules was derived and is described. It was found that the numerical method employed is stable, while the number of iterations required strongly depends on the rate of battery heat generation. A typical result of the modeling is shown, in which the temperature distribution at the mid-height cross-section of a 3-module lead-acid battery is presented. The result shows that the average temperature of modules rises from 25/sup 0/C to approx. 33/sup 0/C after two hours of charging at C/3 rate. The existance of sharp temperature gradient near the external surface indicates the high internal thermal resistance of the battery. The small gap between modules, although provide amore » heat sink, is not effective in dissipating heat under the free convection condition. The result also demonstrates that higher temperature exists near the area whose surface is covered by other modules. The model was also applied to study the thermal behavior of ground nickel/iron cells at various discharge rates and different array arrangement. The effects of cooling rate and the spacing between cells were also studied. Based on estimated parameters, the model prediction agree well with preliminary measurements of cell temperature.« less" @default.
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- W14810000 date "1982-01-01" @default.
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- W14810000 title "Three-dimensional thermal modeling of eV batteries" @default.
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