Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Patent
1998-04-02
1999-08-10
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
320DIG21, H01M 1044, H01M 1046
Patent
active
059363835
ABSTRACT:
A self-correcting and adjustable apparatus and method of predicting remaining capacity (Q) and reserve time (t) of a discharging battery to a selected end voltage determined by an arrangement considering the open circuit voltage (E.sub.oc), battery voltage (V) battery temperature (T) and battery internal resistance (R.sub.int). The apparatus and method of the present invention utilize a calculation process which first compares calculated and measured capacity discharged between two times (Q.sub.dis.calc. -Q.sub.dis.act.). If this difference exceeds a certain predetermined tolerance or limit of error, the calculation process is adjusted or tuned and the comparison is repeated until the difference between the actual capacity and the calculated capacity are within a predetermined tolerance. The calculation process is tuned by adjusting the value attributed to the battery's internal resistance (R.sub.int). A correlation between battery capacity and battery internal resistance is used to make a reasoned initial adjustment to the calculation process. Then an iterative process of successive approximations is used to tune the calculation process within a given tolerance factor. Once the calculation process has been tuned, the adjusted internal resistance (R.sub.int) is then used for subsequent calculations of remaining battery capacity (Q) and reserve time (t). The calculation process may be tuned or adjusted initially, intermittently, or throughout the battery discharge.
REFERENCES:
patent: 5631540 (1997-05-01), Nguyen
patent: 5652502 (1997-07-01), van Phuoc et al.
patent: 5751134 (1998-05-01), Huerner et al.
Hirsch Marc D.
Ng Patrick Kwok-Yeung
Lucent Technologies - Inc.
Tso Edward H.
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