State-of-charge estimating device of secondary battery

Details State-of-charge estimating device of secondary battery State-of-charge estimating device of secondary battery

2008-04-01

2008-04-01

Sterrett, Jeffrey (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S149000, C324S426000, C324S427000, C324S429000, C324S433000

Reexamination Certificate

active

11487882

ABSTRACT:
A state-of-charge (SOC) estimating device and method for a secondary battery that estimates the SOC of the battery with high precision when variation takes place in the parameters of the battery model, even if the input current is constant. A first SOC estimating part estimates the open-circuit voltage by estimating the battery parameters en bloc using an adaptive digital filter computing treatment from the measurement values of the current and the terminal voltage and computes a first estimated SOC of the secondary battery from the open-circuit voltage and a predetermined relationship between the open-circuit voltage and the SOC. A second SOC estimating part computes a second estimated SOC by means of current-integration. State-of-charge estimated value-selecting part selects the second SOC value as when the current is constant and otherwise selects the first SOC value.

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English translation of Yumoto et al.
English Translation of JP 2004079472 A Mar. 2004 Japan Yumoto et al.
Takuya Kinoshita, “Kalman Filtering SOC Estimation For Secondary Batteries”, (Hitachi, Ltd.), Masato Isogai, (Hitachi Maxell, Ltd.).

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