Control-oriented modeling and adaptive parameter estimation of a lithium ion intercalation cell

Battery management systems using parameter and state estimators based on electrochemical models for Lithium ion cells, are promising efficient use and safety of the battery. In this thesis, two findings related to electrochemical model based estimation are presented - first an extended adaptive observer for a Li-ion cell and second a reduced order model of the Pseudo Two-Dimensional model. In order to compute the optimal control at any given time, a precise estimation of the battery states and health is required. This estimation is typically carried out for two metrics, state of charge (SOC) and state of health (SOH), for advanced BMS. To simultaneously estimate SOC and SOH of the cell, an extended adaptive observer, guaranteeing global stability for state tracking, is derived. This extended adaptive observer is based on a non-minimal representation of the linear plant and a recursive least square algorithm for the parameter update law. We further present a reduced order model of the Pseudo Two-Dimensional model, that captures spatial variations in physical phenomena in electrolyte diffusion, electrolyte potential, solid potential and reaction kinetics. It is based on the absolute nodal coordinate formulation (ANCF) proposed in [281 for nonlinear beam models. The ANCF model is shown to be accurate for currents up to 4C for a LiCoO2 /LiC6 cell. The afore mentioned extended adaptive observer is also applied to the ANCF model and parameters are shown to converge under conditions of persistent excitation..

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2015

Author dc:creator

• Bi, Pierre (Pierre Yanhe)

Advisor dc:contributor.advisor

• Anuradha M. Annaswamy.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/100153

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/100153