Method and apparatus for calibrating a rechargeable battery

US6630814B2 · kind B2 · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• Kristoffer Ptasinski · Lund, SE
• Charles Forsberg
• Sarandis Kalogeropoulos · Mendrisio, CH
• Rickard Andersson · Lidköping, SE
• Petrus Sebastiaan Adrianus Daniel Evers · Mineral Springs, US
• Anders Långberg · Veberöd, SE
• David Demers · Wake Forest, US
• Jeremy Robert Carlson · Cary, US
• Derek Liddle · Winchester, GB

Key dates

• Filing date: May 16, 2001
• Grant date: Oct 7, 2003
• Expiry date: May 16, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/10
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Method and apparatus for calibrating a rechargeable battery for mobile telephones and other electronic devices. Calibration is accomplished during a process of completely charging the battery by determining the total amount of charge accepted by the battery during the charging process, and providing a value of total charge capacity of the battery based, at least in part, on the total amount of charge accepted by the battery. The total charge capacity of the battery is used to calculate remaining battery capacity and to predict the remaining operational time of the device. Alternative calibration procedures are provided if the battery is not completely discharged before charging or if the battery is not fully charged by the charging process. The calibration procedures of the invention require no interaction from a user (other than his initiating the normal charging process), and typically permits a calibration to be carried out notwithstanding varying usage habits of different users.