The invention discloses a power battery self-heating control method and system and an automobile. The method comprises the following steps: when the real-time temperature of the power battery is lower than a preset low-temperature threshold value, switching to a self-heating mode of the power battery; after the current open-circuit voltage and the alternating-current internal resistance of the power battery are obtained according to the current SOC, determining the switching frequency and the duty ratio needed by the heating circuit for heating the power battery; controlling the on-off state of a transistor in the three-phase bridge-type structure module according to the determined switching frequency and duty ratio, so a self-heating loop between the three-phase bridge-type structure module and the power battery is conducted; carrying out self-heating operation on the power battery through the conducted self-heating loop until the real-time temperature of the power battery is higher than a preset target temperature threshold value, disconnecting the self-heating loop and quitting the self-heating mode of the power battery. According to the invention, the power battery is heated through the periodic current which is generated by the self-heating loop and can be continuously kept at a relatively high level, so the heating efficiency is improved.

    本发明公开了一种动力电池自加热控制方法、系统以及汽车。该方法在动力电池的实时温度低于预设低温阈值,切换至动力电池的自加热模式;根据当前SOC获取动力电池当前的开路电压和交流内阻之后,确定加热电路对动力电池进行加热所需的开关频率和占空比;根据确定的开关频率和占空比控制三相桥式结构模块中晶体管的通断状态,令三相桥式结构模块与动力电池之间的自加热回路导通;通过导通的自加热回路对动力电池进行自加热操作,直至动力电池的实时温度高于预设目标温度阈值时,断开自加热回路并退出动力电池的自加热模式。本发明通过自加热回路产生的可持续保持在较高水平的周期性电流对动力电池进行加热,提高了加热效率。


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    Title :

    Power battery self-heating control method and system and automobile


    Additional title:

    动力电池自加热控制方法、系统以及汽车


    Contributors:
    DENG LINWANG (author) / FENG TIANYU (author) / LI XIAOQIAN (author) / HE LONG (author)

    Publication date :

    2022-01-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

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



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