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Optical state-of-charge monitor for batteries

United States Patent

5,949,219
September 7, 1999
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A method and apparatus for determining the instantaneous state-of-charge of a battery in which change in composition with discharge manifests itself as a change in optical absorption. In a lead-acid battery, the sensor comprises a fiber optic system with an absorption cell or, alternatively, an optical fiber woven into an absorbed-glass-mat battery. In a lithium-ion battery, the sensor comprises fiber optics for introducing light into the anode to monitor absorption when lithium ions are introduced.
Weiss; Jonathan D. (Albuquerque, NM)
The United States of America as represented by the United States (Washington, DC)
09/ 121,975
July 24, 1998
The present invention was conceived and developed in the performance of a U.S. Government Contract. The U.S. Government has certain rights in this invention pursuant to contract No. DE-AC04-94AL85000 between the United States Department of Energy and Sandia Corporation.