Experimental Study of the Performance of a Li-Ion Battery in a Highway Driving Cycle

Abstract

Li-ion batteries, as a secondary battery type, are currently the most viable option for powering hybrid/electric vehicles. They have considerable advantages such as high specific energy and power, no memory effect, long cycling life, low maintenance requirement, and low self-discharge rate. However, their thermal performance can easily deteriorate at extreme ambient temperatures. Therefore, in this study, thermal and electrical behaviors of Li-ion batteries were investigated under various operating temperatures using a driving cycle that represents a highway driving condition. A battery testing system was used to determine the performance of Li-ion batteries under simulated loads. The results show that the measured temperature profiles, in broad strokes, follow the current profile. Because of the thermal capacitance of the battery, the changes in temperature variations are observed to be the smoothened out version of the current profile. Moreover, the results show that the extreme ambient temperatures have adverse effects on thermal performance of Li-ion batteries. The volumetric energy density and the capacity of the cell significantly decrease at cold ambient temperatures, especially for the sub-zero temperature applications possibly due to weak ionic conductivity within the cell. On the other hand, the difference between the ambient temperature and the surface of the cell becomes more pronounced as the ambient temperature decreases.

Keywords

• Driving cycle,Electric vehicle,Li-ion battery,Thermal behavior

References

1. [1] Huo W., He H., Sun F., 2015. Electrochemical–thermal Modeling for a Ternary Lithium Ion Battery During Discharging and Driving Cycle Testing. Royal Society of Chemistry Advancement, 5, pp. 57599-57607.
2. [2] Pesaran A. A., 2002. Battery Thermal Models for Hybrid Vehicle Simulations. Journal of Power Sources, 110, pp. 377-382.
3. [3] Chung Y., Kim M. S., 2019. Thermal Analysis and Pack Level Design of Battery Thermal Management System with Liquid Cooling for Electric Vehicles. Energy Conversion and Management, 196, pp. 105-116.
4. [4] Motloch C., Christophersen J., Belt J., Wright R., 2002. High-power Battery Testing Procedures and Analytical Methodologies for HEV's. SAE, 797-802 doi: 10.4271/2002-01-1950.
5. [5] Ramadas P., Haran B., White R., Popov B. N., 2002. Capacity Fade of Sony 18650 Cells Cycled at Elevated Temperatures: Part I Cycling Performance. Journal of Power Sources, 112, pp. 606-613.
6. [6] Bandhauer T. M., Garimella S., Fuller T. F., 2011. A Critical Review of Thermal Issues in Li-Ion Batteries. Journal of the Electrochemical Society, 158, pp. 1-25.
7. [7] Nagasubramanian G., 2001. Electrical Characteristics of 18650 Li-ion Cells at Low Temperatures. Journal of Applied Electrochemistry, 31, pp. 99-104.
8. [8] Jaguemont J., Boulon L., Dube Y., Poudrier D., 2014. Low Temperature Discharge Cycle Tests for a Li-Ion cell. Proceeding of IEEE Vehicle Power and Propulsion Conference, Coimbra, Portugal, 27-30 October, pp. 1-6.

9. [9] Tourani A., White P., Ivey P., 2014. Analysis of Electric and Thermal Behavior of Lithium-ion Cells in Realistic Driving Cycles. Journal of Power Sources, 268, pp. 301-314.
10. [10] Panchal S., Mathew M., Dincer I., Agelin-Chaab M., Fraser R., Fowler M., 2018. Thermal and Electrical Performance Assessments of Lithium-ion Battery Modules for an Electric Vehicle under Actual Drive Cycles. Electric Power Systems Research, 163, pp. 18-27.
11. [11] Mastali M., Foreman E., Modjtehedi A., Samadani E., Amirfazli A., Fraser R. A., Fraser R. A., Fowler M., Farhad S., 2018. Electrochemical-thermal Modeling and Experimental Validation of Commercial Graphite/LiFePO4 Pouch Lithium-ion Batteries, International Journal of Thermal Sciences, 129, pp. 218-230.
12. [12] Boyalı A., Güvenç L., 2010. Modeling and Rule Based Control of Hybrid Electric Vehicles. İTÜ Journal/D engineering, 9, pp. 83-94.
13. [13] EPA, 2019. Vehicle and Fuel Emissions Testing. United States Environmental Protection Agency, https://www.epa.gov/vehicle-and-fuel-emissions-testing/vehicle-testing-regulations. (Access Date: 01.01.2018).