Optical state-of-charge monitor for batteries
July 24, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3917411 Apparatus for the continuous measurement of the density of a liquid by utilization of the law of refraction Apparatus for measuring the density of a contained liquid, by utilizing the angular displacement of the limiting angle at total reflection Refractive-index responsive light-signal system Specific gravity transducer and battery performance indicator Electrochromic thin film state-of-charge detector for on-the-cell application Battery voltage tester for end of cell Patent #: 5494496 InventorAssigneeApplicationNo. 121975 filed on 07/24/1998US Classes:320/136, With battery or cell condition monitoring (e.g., for protection from overcharging, heating, etc.)324/427, To determine ampere-hour charge capacity356/135, Prism engaging specimen429/91For charge or liquid levelExaminersPrimary: Wong, Peter S.Assistant: Shin, K. Attorney, Agent or FirmInternational ClassesH02J 007/00G01N 021/41 AbstractA 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. |
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