Patent Number: 6,166,524

Title: Alternate fuel gauge for an alkali metal electrochemical cell

Abstract: A "fuel gauge" for a pulse dischargeable alkali metal/solid cathode cell is described. The rate of voltage recovery is used to determine the state of charge of the cell. Voltage recovery includes recovery from one load to a second, lighter load, or a loaded condition to OCV. The present invention is particularly useful as an end-of-life indicator for a Li/CF.sub.x cell powering an implantable medical device.

Inventors: Takeuchi; Esther S. (East Amherst, NY), Waite; Noelle M. (Clarence Center, NY), Syracuse; Kenneth C. (Williamsville, NY)

Assignee: Wilson Greatbatch Ltd.

International Classification: H01M 10/42 (20060101); H01M 6/00 (20060101); H01M 10/44 (20060101); H01M 6/50 (20060101); G01R 31/36 (20060101); H01M 4/58 (20060101); H01M 6/16 (20060101); H01M 010/44 (); H01M 010/46 ()

Expiration Date: 12/26/2017