Modelling and Simulation of Cooling Systems for BEV High Voltage Battery
Examensarbete för masterexamen
Automotive engineering (MPAUT), MSc
The depletion of oil around the world due to extensive consumption has led to drastic increase in fuel prices. Also, there is a need to reduce emissions to move towards a sustainable future. The emission laws are becoming stricter to counter this and instigate vehicle manufacturers to produce low or zero emission vehicles. The answer to this are Hybrid vehicles and Battery Electric vehicles. Battery powered electric vehicles have zero emissions, if it is considered that the electricity is generated from renewable sources. The biggest challenges associated with these vehicles are maintaining the range and performance as that of conventional vehicles. The problem associated with these vehicles is frequent charging/discharging of the Battery which reduces the Battery performance and longevity. Relatively high levels of heat generated by the cells during these cycles, may lead to very high temperatures. If this is not monitored, it can be very harmful to the Battery. Thus, thermal management of the Battery system is critical, so that necessary cooling is provided to reduce the temperature rise in Battery during its operation, which will increase the longevity of the Battery. This will in turn improve the overall efficiency of the vehicle, affecting the performance and the range of the vehicle. Hence, it is important to ensure that the Battery cell temperatures do not exceed permissible levels, thus preventing component degradation. This thesis work aims at modelling and simulation of cooling circuits for the High Voltage Battery in future Battery electric vehicles via a 1D CFD approach using the commercial software GT-SUITE. The motive behind setting up simulations in a virtual environment is to replicate the physical representation of systems and to predict their behaviour. The advantage of using these models at concept stages of vehicle development helps to apprehend the system better. The study helps in understanding the importance of regulating Battery temperature for various drive case scenarios. A basic control strategy is suggested based on using the cooling system in an energy efficient manner, which could result in decreasing the power consumed and thereby possibly maximising the range of the electric vehicle. Complex control strategies could be determined from analysis much more detailed and comprehensive than the example exhibited in this thesis work.
Energi , Transport , Grundläggande vetenskaper , Hållbar utveckling , Strömningsmekanik och akustik , Energy , Transport , Basic Sciences , Sustainable Development , Fluid Mechanics and Acoustics