Realistic electric vehicle load test for lithium polymer batteries

The purpose of the realistic load test is to determine if a battery voltage would exceed its upper voltage limit during the braking and its lower limit during acceleration. It is also used to determine whether a carpsilas batteries need cooling in summer and/or heating in winter. 100 A-h lithium polymer electric vehicle batteries were tested under simulated operating conditions. During evaluation, the batteries were given the same actual charging and discharging current collected from electric vehicle during a road driving test. The cycle includes; charging (regenerative braking), discharging (acceleration), and resting. The realistic test is followed by a residual discharging; that is, discharging the battery until it is fully discharged; so as to find the energy used during the realistic drive portion. The evaluation was conducted at four different temperatures to study the effect of seasonal changes in temperature. The test show that the lithium batteries performed well (the battery temperature and voltage stayed within their limits) during the evaluation at 0.0degC, +20degC and +40degC.