Model-based prognostics for batteries which estimates useful life and uses a probability density function

US8332342B1 · kind B1 · utility

Assignee

• The United States of America as Represented by the Administrator of the National Aeronautics and Space Administration (NASA) · US

Inventors

• Bhaskar Saha · Redwood City, US
• Kai Frank Goebel · Mountain View, US

Key dates

• Filing date: Nov 19, 2009
• Grant date: Dec 11, 2012
• Expiry date: Feb 5, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/367
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

This invention develops a mathematical model to describe battery behavior during individual discharge cycles as well as over its cycle life. The basis for the form of the model has been linked to the internal processes of the battery and validated using experimental data. Effects of temperature and load current have also been incorporated into the model. Subsequently, the model has been used in a Particle Filtering framework to make predictions of remaining useful life for individual discharge cycles as well as for cycle life. The prediction performance was found to be satisfactory as measured by performance metrics customized for prognostics for a sample case. The work presented here provides initial steps towards a comprehensive health management solution for energy storage devices.