Battery health monitor

US7554294B2 · kind B2 · utility

Assignee

• THE JOHNS HOPKINS UNIVERSITY · US

Inventors

• Rengaswamy Srinivasan · Ellicott City, US
• Hassan Saffarian · Silver Spring, US
• Terry E. Phillips · Ellicott City, US
• Paul R. Zarriello · Catonsville, US
• Bliss G. Carkhuff · Laurel, US
• Subhas Chandra Chalasani · Plano, US

Key dates

• Filing date: Jan 28, 2005
• Grant date: Jun 30, 2009
• Expiry date: May 15, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/389
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A battery health monitor (BHM) that operates as a battery-mountable full-spectrum alternating current (ac) impedance meter that facilitates monitoring a state-of-charge and a state-of-health of a battery. The BHM is used for monitoring one or more electrical parameters, e.g., impedance, of a battery. The BHM includes: a current sink coupled to the first terminal and configured to sink therefrom an oscillatory current so as to cause the battery to produce at a first terminal thereof an oscillatory voltage equal to or less than a dc operating voltage of the battery that would be present at the first terminal in the absence of the oscillatory current; and a voltage sensor configured to sense the oscillatory voltage at the first terminal.