Thermal modeling of the lithium/polymer battery

Thesis/Dissertation · Sat Oct 01 00:00:00 EDT 1994

DOI:https://doi.org/10.2172/10107731· OSTI ID:10107731

Pals, Carolyn R. ^[1]

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1. Univ. of California, Berkeley, CA (United States). Dept. of Chemical Engineering

Research in the area of advanced batteries for electric-vehicle applications has increased steadily since the 1990 zero-emission-vehicle mandate of the California Air Resources Board. Due to their design flexibility and potentially high energy and power densities, lithium/polymer batteries are an emerging technology for electric-vehicle applications. Thermal modeling of lithium/polymer batteries is particularly important because the transport properties of the system depend exponentially on temperature. Two models have been presented for assessment of the thermal behavior of lithium/polymer batteries. The one-cell model predicts the cell potential, the concentration profiles, and the heat-generation rate during discharge. The cell-stack model predicts temperature profiles and heat transfer limitations of the battery. Due to the variation of ionic conductivity and salt diffusion coefficient with temperature, the performance of the lithium/polymer battery is greatly affected by temperature. Because of this variation, it is important to optimize the cell operating temperature and design a thermal management system for the battery. Since the thermal conductivity of the polymer electrolyte is very low, heat is not easily conducted in the direction perpendicular to cell layers. Temperature profiles in the cells are not as significant as expected because heat-generation rates in warmer areas of the cell stack are lower than heat-generation rates in cooler areas of the stack. This nonuniform heat-generation rate flattens the temperature profile. Temperature profiles as calculated by this model are not as steep as those calculated by previous models that assume a uniform heat-generation rate.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10107731
• Report Number(s): LBL-36293; ON: DE95004680; TRN: AHC29505%%20
• Resource Relation: Other Information: TH: Thesis (M.S.); PBD: Oct 1994
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
33 ADVANCED PROPULSION SYSTEMS
ELECTRIC-POWERED VEHICLES
METAL-NONMETAL BATTERIES
THERMAL ANALYSIS
TEMPERATURE DEPENDENCE
TEMPERATURE CONTROL
TEMPERATURE DISTRIBUTION
LITHIUM SULFATES
TITANIUM SULFIDES
MATHEMATICAL MODELS
POLYETHYLENE GLYCOLS
BATTERY SEPARATORS
T CODES
COMPUTER PROGRAM DOCUMENTATION
EXPERIMENTAL DATA
250902
250904
330300
PERFORMANCE AND TESTING
OTHER APPLICATIONS
ELECTRIC-POWERED SYSTEMS