A battery pack 100 includes multiple series-connected battery modules 200 and a battery pack controller 140. Each group of battery modules 200 includes a switch or relay 133 which switches between connecting the battery module group 200 into the series circuit or bypassing the battery module group 200 thus isolating it from the series circuit. The isolated battery module group 200 has a voltage below the safe extra low voltage (SELV) level. The battery pack controller 140 may operate the switch 133 when the vehicle is switched off, in the event of a crash, or when a battery module 200 is determined to have failed. Battery module failure is determined by monitoring the state of health, impedance, thermal properties, and other factors relating to the battery module 200. The battery modules 200 may be submerged in a dielectric liquid which prevent fire and thermal runaway. Pressure sensors and level sensors are used to monitor the dielectric liquid and to determine whether gas must be released.


    Access

    Download


    Export, share and cite



    Title :

    Battery pack controller - safety and reliability of battery pack


    Contributors:

    Publication date :

    2020-12-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



    Battery pack external controller and battery pack

    LIANG DONGSHENG / SI YANTAO | European Patent Office | 2024

    Free access

    BATTERY PACK CONTROLLER

    IKEDA TOMOHIRO / TAKISHITA RYUTA / KAWASHITA KAZUYUKI | European Patent Office | 2015

    Free access


    BATTERY PACK CASE AND BATTERY PACK

    SUGIHARA YURI / TANAKA HIDEAKI | European Patent Office | 2022

    Free access

    Battery pack high-voltage safety protection structure, battery pack and vehicle

    LIU SUHONG / ZENG TING / LI PING et al. | European Patent Office | 2024

    Free access