The embodiment of the invention discloses a battery management circuit, a battery management system, an electric vehicle and a battery management method. The battery management circuit comprises a power supply interface, a plurality of branches and a control unit. The battery interface in each branch is coupled with a battery unit, and the cathode connecting end of the battery interface is coupled and grounded through a branch switch unit and a current detection unit. Each branch switch unit comprises a switch element used for switching on/off the branch and a diode with the conduction direction pointing to the negative electrode connecting end of a battery. The control unit drives the branch switch units to be conducted to form a second conductive path replacing a first conductive path or disconnect the second conductive path according to whether the changes of the current values in the branches reach a threshold, so that the elements are prevented from being overheated. When there is a voltage difference between the batteries, the diodes in the branches with lower voltages are cut off by a reverse bias voltage, so that charging and discharging between the batteries are avoided. In addition, a slow-start main switch unit can avoid spark generation caused by sudden current change. A perfect battery hot plug scheme is realized.

    本申请实施例中的电池管理电路、电池管理系统、电动载具及电池管理方法,电池管理电路包括:一供电接口、多个支路及一控制单元。每个支路中电池接口耦接一电池单元,电池接口的负极连接端经支路开关单元及电流侦测单元耦接并接地;支路开关单元包括用于通/断支路的开关元件和导通方向指向电池负极连接端的二极管,控制单元根据支路中电流值变化达到阈值来驱动支路开关单元导通形成替代第一导电路径的第二导电路径或者断开第二导电路径,避免元件过热;电池间存在电压差时,电压较低支路中的二极管会被反向偏压截止,避免电池间充放电;另外,还可以配合缓启动的主路开关单元以避免电流突变而产生火花;实现完善的电池热插拔方案。


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    Title :

    Battery management circuit, battery management system, electric vehicle and battery management method


    Additional title:

    电池管理电路、电池管理系统、电动载具及电池管理方法


    Contributors:
    MA BINYAN (author)

    Publication date :

    2022-02-08


    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 / 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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