This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Improved Battery Performance in Electric Vehicles via Reduced Glazing Thermal Conductivity
Technical Paper
2011-01-1341
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Reduced battery discharge rates in electric vehicles (EV) tend to extend single-cycle range as well as battery lifetime. Vehicle features that tend to reduce battery discharge rate thus support viability of EV. Of special interest are features that reduce the load on the heating, ventilation and air conditioning (HVAC) system since that system can in turn impose a significant load on EV batteries. A companion paper quantifies the effect on steady state nominal HVAC load of glazing (i.e. window) thermal conductivity using Computational Fluid Dynamics (CFD) to simulate heat transfer between the ambient and the air in a model car cabin when the cabin air is maintained at a comfortable temperature. For hot and cold climate, and for stationary and moving cars, reductions in HVAC load resulted from replacing a monolithic glass backlite and rooflite with polycarbonate (PC), the latter with a five-fold lower inherent thermal conductivity. This paper estimates percent increases in battery single-cycle discharge time, indicative of EV range, and battery lifetime due to these reductions in HVAC load afforded by the lower thermal conductivity of the PC backlite and rooflite. The focus on percent changes instead of absolute values facilitates an approach largely independent of specific battery and EV parameters. Estimated improvements in these measures of battery performance are 2 to 3% for moving cars without accounting for PC's lower mass density relative to glass, which would also tend to reduce battery discharge rate and further improve battery performance.
Recommended Content
Authors
Topic
Citation
Gasworth, S., Tankala, T., Kancharla, A., and Shuler, S., "Improved Battery Performance in Electric Vehicles via Reduced Glazing Thermal Conductivity," SAE Technical Paper 2011-01-1341, 2011, https://doi.org/10.4271/2011-01-1341.Also In
References
- Gasworth, S. Tankala, T. “Reduced Steady State Heating and Air Conditioning Loads via Reduced Glazing Thermal Conductivity,” SAE Technical Paper 2011-01-0126 2011 10.4271/2011-01-0126
- Farrington, R. Rugh, J. “Impact of Vehicle Air-Conditioning on Fuel Economy, Tailpipe Emissions, and Electric Vehicle Range” Earth Technologies Forum Washington, D.C. October 31 2000
- Doerffel, D. Sharkh, S.A. “A Critical Review of Using the Peukert Equation for Determining the Remaining Capacity of Lead-Acid and Lithium-Ion Batteries,” Journal of Power Sources 155 395 400 2006
- Drouilhet, S. Johnson, B.L. “A Battery Life Prediction Method for Hybrid Power Applications” 35th AIAA Aerospace Sciences Meeting and Exhibit Reno, Nevada January 6 9 1997
- Rugh, J. “Proposal for a Vehicle Level Test Procedure to Measure Air Conditioning Fuel Use,” SAE Technical Paper 2010-01-0799 2010 10.4271/2010-01-0799