چكيده به لاتين
With regards to issues like air pollution and rising fossil fuel prices, governments, industry and researchers have been struggling to find an alternative to conventional cars. In this regard, electric vehicles are considered as one of the most suitable alternatives for conventional cars and have come to production and commercialization. One of the most important challenges with electric vehicles is the performance of the battery with optimum efficiency. Since the batteries have an optimal temperature range, heat transfer in their cells should be made in such a way as to maintain the operating temperature in the optimal area. One ways for controlling heat transfer is the use of phase-change materials around the cells of these batteries which We intend to provide the best way to thermal manage in these batteries by simulating heat transfer in cells and using phase-varying phase material with different geometries using Ansis Fluent software. In this essay, we first study the melting of a phase change material in a vertical cylindrical tube by numerical method and validate the results using experimental data. The numerical analysis is performed using an enthalpy–porosity formulation. The effect of the term describing the mushy zone in the momentum equation is examined. The results show quantitatively that at the beginning of the process, the heat transfer is by conduction from the tube wall to the solid phase through a relatively thin liquid layer. As the melting progresses, natural convection in the liquid becomes dominant, changing the solid shape to a conical one. After simulating melting in cylindrical tube and ensuring the accuracy of the results, The function of the thermal management system based on the phase change material for four different arrays of cells in the module consists of fourteen cylindrical cells and the same volume of phase-change material (for four row, rectangular, hexagonal and octagonal arrangements) have simulated, analyzed and compared. The results of these simulations indicate that the hexagonal and rectangular makeup is melting later than the other two layers and hence more suitable layouts. On the other hand, considering the necessity of low maximum temperature difference and maximum cell temperature in the battery, the hexagonal arrangement is the most suitable arrangement, and then the rectangular gradient with the least significant difference will be chosen.
Keywords: Electric Vehicle, phase change material(PCM), battery thermal management,
Battery Madule, cell arrangement, Numerical Simulation.
