Optical state-of-charge monitor for batteries

Details Optical state-of-charge monitor for batteries Optical state-of-charge monitor for batteries

1998-07-24

1999-09-07

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

429 91, 320DIG21, 324427, 356135, H02J 700, G01N 2141

Patent

active

059492198

ABSTRACT:
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.

REFERENCES:
patent: 3917411 (1975-11-01), Schwizer et al.
patent: 3932038 (1976-01-01), Schweizer et al.
patent: 3977790 (1976-08-01), Schweizer et al.
patent: 4240747 (1980-12-01), Harmer
patent: 4329406 (1982-05-01), Dahl et al.
patent: 5458992 (1995-10-01), Bailey
patent: 5494496 (1996-02-01), Huhndorff et al.

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