Study In Wind Cooling System For RAV-4 EV Packs

As one of the key technologies in the development of battery electric vehicles, battery management system (BMS) is the key factor in the commercialization and practiclization of electric vehicles. This paper dedicates on the research of thermal management system of electric vehicle battery, analyzing the cooling system in the Toyota electric vehicle RAV-4. With the help of FLUENT software, using the computational aerodynamics numerical simulation methods, exploring the internal air flow situation in the battery simulation for the flow situation of cooling gas in the battery packet.The main content of this paper are as follows:(1) Introduce the heating mechanism of the nickel-hydrogen battery and comparatively analyze the temperature of the nickel-hydrogen battery through the influence on them when the IC charges and discharges under different temperature.(2)Analyze the cooling mode of the internal battery module within the RAV-4 battery packet, compare the serial and parallel ventilation cooling and shows the superiority of object structural design in this paper.(3) Using numerical simulation method to research on the ventilation cooling effect on the thermal management during the nickel-hydrogen batteries practices. Achieving its internal airflow situation according to the actual vehicles (RAV-4) modeling and simulation of the internal structure of the battery package(4)To conduct real-time monitoring tests on the three typical conditions (the exercise, parking charge, post-charging) through 40 multi-point temperature sensors on the internal temperature of the batteries packages. The running result on Toyota RAV-4 in the national electric vehicle Experiment Demonstration Centre showed: if the temperature of the battery package can remain the optical working temperature range of MH/ Ni batteries, the difference of the temperature will be less than 5℃, while the cooling system can run very well.(5) Conduct comparative analysis on the simulation results and the result on the multi-point measurement, raise suggestion for further improvement. The result of this study will be highly reference valued in the layout of the internal batteries module and the design for cooling system in electric vehicles.