公开(公告)号：US11860235B2

公开(公告)日：2024-01-02

申请号：US17693679

申请日：2022-03-14

Applicant: DENSO CORPORATION

Inventor： Yuri Sano ,  Hiroki Fujii ,  Koji Ohira

IPC: G01R31/389 ,  G01R31/3842 ,  G01R31/374 ,  G01R31/36

CPC classification number: G01R31/389 ,  G01R31/3648 ,  G01R31/374 ,  G01R31/3842

Abstract: A battery state estimation apparatus calculates a measured DC resistance value of a DC resistance based on a current change amount and a voltage change amount, which are calculated in a predetermined period using measured current value and voltage value. The battery state estimation apparatus further calculates (i) a non-temperature dependent constant and (ii) a constant of a temperature dependent function based on (i) an estimated DC resistance value and (ii) the measured DC resistance value. The estimated DC resistance value is an estimated value of the measured DC resistance value; the estimated DC resistance value is represented as a sum of (i) the non-temperature dependent constant Ra, which indicates a temperature independent component of the DC resistance of the secondary battery, and (ii) the temperature dependent function Rb, which indicates a temperature dependent component of the DC resistance of the secondary battery.

公开(公告)号：US10302706B2

公开(公告)日：2019-05-28

申请号：US14944989

申请日：2015-11-18

Applicant: DENSO CORPORATION

Inventor： Yuri Sano

IPC: G01R31/36 ,  G01R31/367 ,  G01R31/3842

Abstract: In an apparatus, an OCV calculator measures a close circuit voltage (CCV) across an equivalent circuit of a storage battery, and calculates an open circuit voltage (OCV) across the storage battery based on the CCV, the equivalent circuit, and a current flowing through the storage battery. The equivalent circuit simulates an electrochemical behavior of the storage battery. The equivalent circuit includes the OCV as a power supply voltage and a predetermined internal impedance connected in series to the power supply voltage. The internal impedance includes a capacitance. A calculator calculates an SOC of the storage battery as a function of the OCV. A determiner determines whether the capacitance is saturated as a function of an electrical parameter associated with a charge stored in the capacitance. A diagnosing unit diagnoses whether the SOC of the storage battery is appropriate according to whether the capacitance is saturated.