Device and method for battery state determination

US7561978B2 · kind B2 · utility

Assignee

• VB Autobatterie GmbH & Co. KGAA · DE

Inventors

• Ingo Koch · Hameln, DE
• Eberhard Meissner · Hofheim, DE

Key dates

• Filing date: Sep 17, 2007
• Grant date: Jul 14, 2009
• Expiry date: Sep 17, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/3648
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining the state of a battery includes receiving measurements representative of at least one of a battery terminal voltage and a battery terminal current from a first unit and using a second unit to determine at least one characteristic variable for a battery state from at least one of the measured battery terminal voltage and the measured battery current. The method also includes using a microprocessor to statistically assess the at least one characteristic variable for the battery state by performing a statistical process check. The method further includes defining an observation window for the at least one characteristic variable within which the at least one characteristic variable is assumed to be steady-state and identifying an implausible value, which is not caused by the battery, for the at least one characteristic variable if the scatter of the at least one characteristic variable exceeds a defined scatter limit.