Accession Number:

ADA583295

Title:

Online Parameterization of Lumped Thermal Dynamics in Cylindrical Lithium Ion Batteries for Core Temperature Estimation and Health Monitoring

Descriptive Note:

Journal article

Corporate Author:

MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING

Report Date:

2012-01-01

Pagination or Media Count:

13.0

Abstract:

Lithium ion batteries should always be prevented from overheating and hence thermal monitoring is indispensable. Since only the surface temperature of the battery can be measured, a thermal model is needed to estimate the core temperature of the battery, which can be higher and more critical. In this paper, an online parameter identification scheme is designed for a cylindrical lithium ion battery. An adaptive observer of the core temperature is then designed based on the online parameterization methodology and the surface temperature measurement. A battery thermal model with constant internal resistance is explored first. The identification algorithm and the adaptive observer is validated with experiments on a 23Ah 26650 lithium iron phosphategraphite battery. The methodology is later extended to address temperature dependent internal resistance with non-uniform forgetting factors. The capability of the methodology to track the long term variation of the internal resistance is beneficial for battery health monitoring.

Subject Categories:

  • Electrochemical Energy Storage
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE