Thermal Management Development Of Battery Electric Vehicle Based Heat Pump

Along with the increasing environmental and energy problem, the world's major motormakers have invested a lot of manpower, material resources and financial resources to develop and produce battery/hybrid/fuel cell electric vehicles. As one of the types, there are several BEVs(Battery Eelectric Vehicle) entering into the market.On the basis of a lot of papers including home and abroad, concerning the problem of the thermal management of refrigeration, heating, battery and motor of BEV are isolated separation,which can't effectively integrated management. Using heat pump technology, put forward a kind of integrated thermal management system which can recycle motor's waste heat in heating mode and cool battery in refrigeration mode.First of all, design BEV's thermal management system(TMS) solutions using heat pump technology.In summer condition, the cooling system like the traditional automobile's air conditioner cycle.When the BEV's speed is high, the battery has a large calorific value, and the solution for battery thermal management system is that using TMS to chilling battery. In winter condition, using heat pump cycle instead. The interior will get heat from outside environment by the heat pump. At the same time, the heat recovery loop with motor would be activate that can recycle heat form heat exchanger which is the bridge of motor's chilling loop and heat pump loop, increase the heating's effect, reduce the power consumption of the heating mode.Second, develop automatic control system for BEV's thermal management system based on freescale's 16-bit microcontroller of MC9S12XEP100. On the side of hardware, draw the schematic circuit diagram in the use of Altium Designer. On the side of Software, develop controling system modularized in the use of Mat Lab/Simulink/Stateflow and generate the standard C program automatically in the use of RTW.Then, conduct the performance test experiment of thermal management system. With various typical working conditions under the cooling and heating mode. The results show that thermal management system can satisfy the demands of the vehicle's cooling and heating. In meanwhile, the controller's initial online calibration is carried out with CANape.At last, on the basis of theory and experiment, the thermal management model is established, integrated into the whole vehicle model based on Advisor platform. The results show that in the winter's heating mode, compared with the PTC system, the power consumption of the BEV reduce by 16.4%, and driving range increased by 18.3% when equipped with heat pump.In this paper, a comprehensive design scheme of BEV's thermal management system is proposed. And develop its automatic control system which achieved the vehicle thermal management regulation integral. The work of this paper is of great significance to promote the development of BEV's thermal management system and the commercialization of the battery electric vehicles.