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160 Ah LiFePO4 prismatic cells were tested for capacity, cycle life and realistic road test evaluation for the application of electric vehicle. The testing was done to compare the performance of LiFePO4 cells to LiCoO2 cells that were previously shown to be not suitable for use in EVs. The testing was done in the Battery Evaluation Lab at UMass, Lowell (Massachusetts), which is briefly described....
The purpose of this paper is to investigate the performance of 100 A-h lithium polymer batteries to determine their suitability for use in battery powered electric vehicles (BPEVs). The performance includes: battery cell capacity evaluation, battery efficiency, temperature effects on the performance of the batteries, self discharge, fast chargeability, and realistic load test. These are important...
Results of cycle testing and load testing 100 amp-hour prismatic lithium cobalt cells at -20degC, 0degC, +20degC and +40degC are presented. The goal was to demonstrate and / or confirm the name-plate capacity rating of the cell and to investigate the effect of cycling at various temperatures on capacity in the early life of the cell with the long term goal of using these cells in electric vehicles...
This paper investigates the fast chargeability of lithium polymer batteries. Attempts to fast charge 100 A-h lithium polymer batteries are presented in this paper. The tests were done at five charging currents: 50 amperes (0.5C), 100 amperes (1C), 200 amperes (2C), 300 amperes (3C), and 320 amperes (3.2C). The tests were done at three ambient temperatures: -20, 0.0, and +20degC. The currents, voltages,...
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,...
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