Secondary battery charge/discharge electricity amount...

Details Secondary battery charge/discharge electricity amount... Secondary battery charge/discharge electricity amount...

2005-01-27

2009-12-08

Dunn, Drew A (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S063000, C320S127000, C320S137000

Reexamination Certificate

active

07630842

ABSTRACT:
If a particular selection condition is satisfied, a non-load voltage calculation unit (105) calculates a no-load voltage Vsep as a voltage piece when the current in approximate straight line obtained by statistical processing using the method of least squares for a plurality of sets of data containing current data I(n) and voltage data V(n) is zero. If a particular current condition or voltage condition is continuously satisfied for a predetermined time, an open-circuit voltage calculation unit (106) calculates a secondary cell terminal voltage as an open-circuit voltage Voc and a voltage-at-zero-current storing unit (108) stores voltage-at-zero-current Vzo calculated by a voltage-at-zero-current calculation unit (107). By using a predetermined voltage change amount adjustment constant ΔVbc/adjustment coefficient Kb, an electromotive force change constant Keq, and a polarization voltage generation constant Kpol, an estimated charge/discharge electric amount calculation unit (118A) calculates an estimated charge/discharge electricity amount ΔQe as a function of the change amount ΔVzo of a voltage-at-zero-current Vzo. It is possible to estimate charge/discharge electricity amount without being affected by the current measurement error.

REFERENCES:
patent: 6160380 (2000-12-01), Tsuji et al.
patent: 2004/0239333 (2004-12-01), Kikuchi
patent: 6-331714 (1994-12-01), None
patent: 2000-147075 (2000-05-01), None
patent: 2001-223033 (2001-08-01), None

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