The invention discloses a method for prolonging the service life of a power battery of an electric automobile in the technical field of automobile engineering. The method comprises the steps that S1, the braking force distribution range of front and rear wheels is determined according to automobile structure parameters, an ideal braking force distribution curve, an ECE regulation curve and an f curve; s2, dividing the SOC of the power battery into three intervals according to the impedance spectrum frequency change trend of the power battery when the SOC of the power battery is different; s3, calculating an optimal braking strength point, and designing a front and rear wheel braking force distribution curve and a regenerative braking fuzzy controller according to the divided intervals; s4, formulating a composite power supply system control strategy based on a double fuzzy controller; and S5, calculating battery capacity attenuation according to the battery life model. According to the method, the SOC of the power battery is divided into three intervals according to the impedance spectrum frequency change of the battery, and a braking force distribution scheme considering the service life of the battery is designed for the three intervals, so that the service life of the battery is prolonged.

    本发明公开了汽车工程技术领域的一种电动汽车动力电池寿命的延长方法,包括步骤S1:根据汽车结构参数、理想制动力分配曲线、ECE法规曲线、f曲线确定前后轮制动力分配范围;步骤S2:根据动力电池SOC不同时其阻抗谱频率变化趋势,将动力电池SOC划分为三个区间;步骤S3:计算最优制动强度点,根据划分的区间设计前后轮制动力分配曲线,再生制动模糊控制器;步骤S4:制定基于双模糊控制器的复合电源系统控制策略;步骤S5:根据电池寿命模型计算电池容量衰减。本发明根据电池阻抗谱频率变化将动力电池SOC划分三个区间,针对三个区间设计考虑电池寿命的制动力分配方案,以实现电池寿命的延长。


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    Title :

    Method for prolonging service life of power battery of electric vehicle


    Additional title:

    一种电动汽车动力电池寿命的延长方法


    Contributors:
    SHEN YUTAO (author) / SHEN YONGFENG (author) / ZHANG JIE (author)

    Publication date :

    2023-01-13


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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