State of charge indicator

Details State of charge indicator State of charge indicator

1999-05-14

2000-10-03

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

324432, 324433, H02J 700, G01N 27416

Patent

active

061278068

ABSTRACT:
A state of charge indicator of a lithium ion battery computes a state of charge (SOC) corresponding to a cell open circuit voltage from a SOC-cell open circuit voltage characteristic map, and displays the SOC on a display device. Herein, the SOC-cell open circuit voltage characteristics are obtained by defining the battery charge amount when the open circuit voltage of the cell is 3.9 V as SOC=100%, and defining the battery charge amount when the open circuit voltage of the cell is 3.5 V as SOC=100%. By defining SOC=100% and SOC=0% in this way, the SOC can be correctly computed and displayed even if the battery has deteriorated.

REFERENCES:
patent: 5160880 (1992-11-01), Palanisamy
patent: 5321627 (1994-06-01), Reher
patent: 5352968 (1994-10-01), Reni et al.
patent: 5381096 (1995-01-01), Hirzel
patent: 5539318 (1996-07-01), Sasaki
patent: 5561362 (1996-10-01), Kawamura et al.
patent: 5821756 (1998-10-01), McShane

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