ECONOMIC FEASIBILITY ESTIMATION DEVICE AND ECONOMIC FEASIBILITY ESTIMATION METHOD USING CHARGE AND DISCHARGE CURVE OF BATTERY

Title:

ECONOMIC FEASIBILITY ESTIMATION DEVICE AND ECONOMIC FEASIBILITY ESTIMATION METHOD USING CHARGE AND DISCHARGE CURVE OF BATTERY

Document Type and Number:

WIPO Patent Application WO/2024/009854

Kind Code:

A1

Abstract:

This economic feasibility estimation device derives approximate curves of an initial open terminal voltage function and an initial impedance function, sets a prior-estimation function, and measures charge/discharge voltages and charge/discharge currents. A state estimation unit uses a Kalman filter to estimate state parameters including an SOC value, a polarization voltage, and internal impedance. An estimation error between the prior-estimation voltage and an actual measurement voltage is obtained by using the state parameters, and a posterior estimation value is obtained with a correction equation formed by a Gaussian function having terms of a learning rate and a correction width that are set for the calculated estimation error and current values. The prior estimation function is corrected on the basis of the posterior estimation value, a new prior estimation function is set, and the charge/discharge curve is estimated. An economic feasibility index is estimated on the basis of charge/discharge power amounts of a secondary battery, which are estimated from the charge/discharge curve.

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Inventors:

ARIMA MASAHITO (JP)
LIN LEI (JP)
ONIKI NAOKI (JP)

Application Number:

PCT/JP2023/023864

Publication Date:

January 11, 2024

Filing Date:

June 27, 2023

Export Citation:

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Assignee:

DAIWA CAN CO LTD (JP)

International Classes:

G01R31/367; G01R31/378; G01R31/382; G01R31/385; G01R31/387; G01R31/389; G01R31/392; H01M10/44; H01M10/48; H02J7/00

Domestic Patent References:

WO2019240270A1	2019-12-19
WO2019117198A1	2019-06-20

Foreign References:

JP2022007946A	2022-01-13
JP2017220293A	2017-12-14
JP2015224876A	2015-12-14
CN111896881A	2020-11-06

Attorney, Agent or Firm:

SUZUYE & SUZUYE (JP)

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