Integrated Battery and Traction Cooling Based on Reversed Brayton Refrigeration Cycle for High Speed Performance Bikes.

Recent advancement and compact design requirements in the field of two wheeler Electric vehicle has resulted for the requirement of cooling system for high performance bikes. It has also been observed that heating requirement are dominant at higher speed, because of higher power consumption and thus cooling is required for high speed EV bikes. This paper represents an integrated motor and battery cooling system taking advantages of freely available air. Air collector will be installed in the direction of the vehicle motion to collect available ram air, the collected ram air will be divided into two parts, one part will be directed to motor and MCU for direct air cooling and the second part will be used for battery cooling. Second part will be made to pass through a drier to make air moisture free, the dry air is then made to pass through compressor where it is isentropically compressed to higher pressure. Then this compressed air will be intercooled to initial atmospheric temperature with the help of an intercooler. The cooled air is then isentropically expanded in the turbine to cool it further. This cooled air is then made to pass over battery for cooling by convection. The integrated battery and traction cooling system will operate in different modes as per cooling requirements of vehicle based on ambient temperature. 1. Mode I: Integrated battery and traction cooling Mode 2. Mode II: Only Battery cooling Mode 3. Mode III: Only battery heating mode 4. Mode IV: Self circulation Mode Advantage 1. It works on reverse Brayton refrigeration cycle and uses freely available air instead of water glycol or refrigerant for motor and batter cooling. 2. This system will provide cooling based on vehicle speed thus will optimize the vehicle cooling cycle. 3. Since it works on open gas cycle there will not be any coolant leakage problem and will require less maintenance. 4. Less expensive as compared to refrigerant cooling cycle.