Method for dynamically measuring the state of health and...

Details Method for dynamically measuring the state of health and... Method for dynamically measuring the state of health and...

2005-04-05

2005-04-05

Tso, Edward H. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

Reexamination Certificate

active

06876174

ABSTRACT:
Based on the measurement of the increase of sinusoidal voltage ΔV=Vmaxsine(2πft) on adding a sinusoidal current ΔI=Imaxsine(2πft+φ) to the battery current, where f is the frequency and Imax, the amplitude of the superimposed current, with whose magnitudes the electrochemical impedance of the battery Z(f)=Vmax/Imaxejφis calculated, comprising the application of a first sinusoidal signal of prefixed frequency to the battery which generates an alternate voltage component superimposed over the direct one; eliminating the direct component of the response signal; applying a second periodic voltage signal with a frequency identical to that of said first signal and carrying out a synchronous detection of the alternate component generated by the application of said first signal to obtain the voltage proportional to the electrochemical impedance and evaluate the state of health and charge of the battery.

REFERENCES:
patent: 4816768 (1989-03-01), Champlin
patent: 5862515 (1999-01-01), Kobayashi et al.
patent: WO 9415222 (1994-07-01), None

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