Method for estimating battery degradation in a vehicle battery pack

US8519674B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• Alastair Gordon Anderson · Munich, DE
• Remy Fontaine · Montlhéry, FR
• Sebastian Lienkamp · Milford, US
• Stephen Raiser · Egelsbach, DE
• Peter Kilian · Heidelberg, DE

Key dates

• Filing date: Nov 12, 2009
• Grant date: Aug 27, 2013
• Expiry date: Jul 7, 2031

Classification

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

Abstract

A method for gathering information from battery sensors—for instance, information regarding the state-of-charge (SOC), temperature and/or other characteristics of battery cells in a vehicle battery pack—and using that information to estimate or predict battery degradation or state-of-health (SOH). According to an exemplary embodiment, the method uses both a time-based algorithm and an event-based algorithm to predict or estimate battery degradation. The event-based algorithm may select certain data from the battery conditions (e.g., a state-of-charge (SOC) swing (ΔSOC) or an SOC maximum (SOCMax)), instead of using the entire set of battery condition data, and may use this information in its prediction or estimate.