The invention discloses a power battery pulse heating method and system and an electric automobile, and the method comprises the steps: calculating the duty ratio d of six power switches according to U alpha and U beta, and forming the pulse width modulation signals of the six power switches in combination with the switching frequency f. The six power switches are controlled to be switched on and off according to the mode of the first strategy based on the pulse width modulation signal, and pulse heating current is generated. Wherein the strategy I specifically comprises the following steps of: switching on a lower bridge power switch of one phase of bridge arm and upper bridge power switches of the other two phases of bridge arms at the previous d * T time of the (i + 2k * n) th switching period, and switching off six power switches at the later (1-d) * T time; the six power switches are turned off before (1-d) * T time of the (i + (2k + 1) * n) th switching period, and the lower bridge power switch of one phase of bridge arm and the upper bridge power switches of the other two phases of bridge arms are turned on after d * T time. The problem of shaking generated when the power battery of the electric automobile is subjected to pulse heating in a low-temperature environment can be solved.

    本发明公开了一种动力电池脉冲加热方法、系统及电动汽车,其方法包括:根据Uα、Uβ,计算六个功率开关的占空比d,结合开关频率f,形成六个功率开关的脉宽调制信号。基于脉宽调制信号控制六个功率开关按照策略一的方式通断,产生脉冲加热电流。其中,策略一具体为:在第i+2k*n个开关周期的前d*T时间一相桥臂的下桥功率开关、另两相桥臂的上桥功率开关导通,后(1‑d)*T时间六个功率开关都关断;在第i+(2k+1)*n个开关周期的前(1‑d)*T时间六个功率开关都关断,后d*T时间一相桥臂的下桥功率开关、另两相桥臂的上桥功率开关导通。采用本发明能解决电动汽车在低温环境下动力电池脉冲加热时产生的抖动问题。


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    Title :

    Power battery pulse heating method and system and electric vehicle


    Additional title:

    动力电池脉冲加热方法、系统及电动汽车


    Contributors:
    XIAO FENG (author) / SU LING (author) / WANG SHUANGQUAN (author) / ZHOU MIN (author)

    Publication date :

    2024-11-08


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern / 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



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