| As energy shortage and environment pollution problem increasingly prominent, electric vehicle (EV) has become an important way and inevitable choice for energy saving and emission reduction in the world transportation field. Major global auto companies have invested heavily in electric vehicle technology and product research.As the energy storage component of EV, battery becomes the main reason for restricting the development of EV. Ni-MH power capacitor batteries are used in EV for its advantage, but its exothermic question is a problem that must be cared. It not only influences the performance of Ni-MH power capacitor batteries, but also can bring safety problems. So heat dissipation system of battery pack in EV is essential for effective operation in all condition.This paper is based on Ni-MH power batteries which are used on electric bus. The reaction principle and heat mechanism of Ni-MH power capacitor battery are analyzed, and the heat dissipation of Ni-MH power capacitor battery is studied by means of the combination of simulation and experimental method, and the heat dissipation of the battery pack is designed. In order to achieve effective heat dissipation and temperature equilibrium when charging, this study improved and optimized the structure of the heat dissipation of the battery pack. This paper includes the following content:First of all, the structure of Ni-MH power capacitor battery is introduced in the paper, and the heat mechanism and the reaction principle of Ni-MH power capacitor battery are analyzed, then the heat production of the battery is calculated.Secondly, thermal simulation is implemented by establishing single Ni-MH power capacitor battery model, and the test on the temperature rise of the battery charging is conducted, it can not only help analyze the heat transfer of Ni-MH power capacitor battery but also test the reliability of thermal simulation by comparing test results and simulation results.Then, the cooling mode and the ventilation mode of the internal battery within the battery pack are analyzed according to the design process of heat dissipation system, and the heat dissipation system of battery pack is designed from a balance between the two aspects of effective heat dissipation and temperature equilibrium, which includes the calculation of the amount of heat the battery pack, fan selection, the size determination of the heat sink and air duct, the structural design of heat dissipation system and so on.Finally, the geometric model of battery pack is established by using 3D modeling software, thermal simulation for heat dissipation system of battery pack is achieved with ANSYS software. After analyzing the simulation results, problems should be found from the simulation results and the structure of original heat dissipation system should be improved and optimized, then verify the heat dissipation performance of the cooling system after optimization by simulation.This paper introduces the latest research heat dissipation system at home and abroad and did a correlation analysis, then puts forward the general design method of power battery cooling system, summarizes the reasonable design process, and introduces the cooling device. This study has a guiding significance for the design and development of the overall cooling system of power battery. |
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