The invention discloses an electric automobile, a lithium ion battery system and a control method and a control device thereof, the lithium ion battery system comprises a first battery module and a second battery module, the rated capacity of the first battery module is larger than that of the second battery module, and the rated capacity of the second battery module is larger than that of the first battery module. The control method comprises the following steps: obtaining a target parameter of the first battery module; the target parameter is a cell voltage or a battery electric quantity; and in the discharging process of the lithium ion battery system, if the target parameter is lower than a first threshold value, reducing the output power of the first battery module according to a set rate, and improving the output power of the second battery module according to the set rate. According to the method, a large number of battery modules are protected against the obvious undervoltage problem under the condition of continuous output or high-power output, and the problems of sudden power drop, short-time power interruption and incoherent power output of the vehicle are solved.

    本发明公开了一种电动汽车、锂离子电池系统及其控制方法、控制装置,其中所述锂离子电池系统包括第一电池模块与第二电池模块,所述第一电池模块的额定容量大于所述第二电池模块的额定容量,所述控制方法包括:获得所述第一电池模块的目标参数;所述目标参数为电芯电压或电池电量;在所述锂离子电池系统的放电过程中,若所述目标参数低于第一阈值,则按照设定速率降低所述第一电池模块的输出功率,并按照所述设定速率提高所述第二电池模块的输出功率。上述方法保护大量电池模块在持续输出或大功率输出情况下不会出现明显的欠压问题,且不会造成本车动力突降、动力短时中断、动力输出不连贯的问题。


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    Title :

    Electric automobile, lithium ion battery system and control method and control device of lithium ion battery system


    Additional title:

    电动汽车、锂离子电池系统及其控制方法、控制装置


    Contributors:
    ZHU JINXIN (author)

    Publication date :

    2022-07-12


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    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



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