A voltage of a battery cell is measured, and a current flowing through the battery cell is measured. An open circuit voltage (OCV) of the battery cell is estimated based on the measured voltage, the measured current, and an equivalent circuit model based on electrochemistry of the battery cell, and a state of charge (SOC) of the battery cell is estimated based on the estimated OCV, SOC-OCV characteristics on a charge side of the battery cell, and SOC-OCV characteristics on a discharge side of the battery cell. At least one of a positive electrode and negative electrode of the battery cell is a mixed electrode containing a plurality of materials. Estimated is a current flowing through a material in which capacity-OCV characteristics are different between the charge side and the discharge side, the material being included in the plurality of materials contained in the mixed electrode, and a ratio between the SOC-OCV characteristics on the charge side and the SOC-OCV characteristics on the discharge side is determined based on the current.


    Access

    Download


    Export, share and cite



    Title :

    Battery state estimation device, battery state estimation method, and battery system


    Contributors:

    Publication date :

    2023-11-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung



    BATTERY STATE ESTIMATION DEVICE, BATTERY SYSTEM, AND BATTERY STATE ESTIMATION METHOD

    RAHUL KUMAR / KONO TORU / UEDA YUTAKA et al. | European Patent Office | 2023

    Free access

    BATTERY STATE ESTIMATION DEVICE, BATTERY STATE ESTIMATION METHOD, AND BATTERY SYSTEM

    NISHIKAWA SHINYA / WATANABE TOHRU / IIDA TAKASHI | European Patent Office | 2022

    Free access

    BATTERY STATE ESTIMATION DEVICE, BATTERY STATE ESTIMATION SYSTEM, BATTERY STATE ESTIMATION METHOD, AND RECORDING MEDIUM

    FUJII ASAKO / KASHIMA TAKUROH / OI NORIHITO et al. | European Patent Office | 2023

    Free access

    BATTERY STATE ESTIMATION DEVICE, BATTERY SYSTEM, AND BATTERY STATE ESTIMATION METHOD

    KUMAR RAHUL / KOUNO TORU / UEDA YUTAKA et al. | European Patent Office | 2023

    Free access

    BATTERY STATE ESTIMATION DEVICE

    OUCHI MASANOBU / OKUMURA MOTOYOSHI / TERASHIMA DAIKI | European Patent Office | 2022

    Free access