The invention discloses a direct current charging circuit and a direct current charging method, and relates to the technical field of electric vehicle charging. The circuit comprises: a bidirectional DC converter comprising a low voltage port and a high voltage port; the low-voltage port is connected with a low-voltage auxiliary battery of the vehicle through a switch element, and a charging socket of the vehicle is connected to the two ends of the switch element and the low-voltage auxiliary battery in parallel through a first one-way conductive element. The high-voltage port is connected with a high-voltage direct-current bus of a power battery of the vehicle; and the bidirectional direct current converter is used for converting high-voltage electricity transmitted by the power supply equipment through the charging socket in a constant-voltage mode or a constant-current mode into low-voltage electricity under the condition that the low-voltage auxiliary battery and the power battery are both in a feed state, and charging the low-voltage auxiliary battery by using the low-voltage electricity. According to the invention, deep discharge of the power battery caused by the fact that the fed power battery supplies power to the low-voltage auxiliary battery can be avoided, so that a battery cell of the power battery is prevented from being damaged.

    本申请公开了一种直流充电电路和直流充电方法,涉及电动汽车充电技术领域。所述电路包括:双向直流转换器,双向直流转换器包括低压端口和高压端口;低压端口通过一个开关元件与车辆的低压辅助电池连接,且车辆的充电插座通过第一单向导电元件并联连接于开关元件和低压辅助电池的两端;高压端口与车辆的动力电池的高压直流母线连接;双向直流转换器用于:在低压辅助电池和动力电池均处于馈电状态的情况下,将供电设备以恒压模式或恒流模式通过充电插座输送的高压电转化为低压电,并利用低压电为低压辅助电池充电。本申请能够避免因已经馈电的动力电池给低压辅助电池补电而导致动力电池深度放电,从而避免损害动力电池的电芯。


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    Title :

    Direct current charging circuit and direct current charging method


    Additional title:

    一种直流充电电路和直流充电方法


    Contributors:
    ZHOU JIYUN (author) / LIU DONGQUN (author)

    Publication date :

    2024-10-29


    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 / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen




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