The invention provides a control method and a control device for low-temperature fast charging of an electric vehicle, and the electric vehicle. The control method comprises the steps that after charging configuration is completed, when the lowest temperature of a single battery of a battery pack is lower than a preheating intervention temperature, a heating relay and a direct current-to-direct current converter are closed; a first control signal including the first request voltage, the request current and the constant voltage output mode is sent to the charging pile; when the charging pile is in a stable output state, a main positive relay of the battery pack is disconnected; and when the lowest temperature of the single batteries in the battery pack is lower than the first preset temperature, a boost signal including the second request voltage is sent to the charging pile. In the method of the invention, the existing structure of the battery pack is not changed, and the charging pile is enabled to be boosted for power supply in the boosting stage through segmented control only when the battery pack needs to be heated, so that the heating power of the battery pack is improved, the battery pack can enter the charging stage as soon as possible, the low-temperature quick charging time is shortened, and the cost is not increased.
本发明提供了一种电动汽车低温快充的控制方法、控制装置及电动汽车,其中,控制方法包括:在充电配置完成后,当电池包的单体电池最低温度低于预加热介入温度时,闭合加热继电器和直流转直流变换器,并发送包括第一请求电压、请求电流以及恒压输出模式的第一控制信号至充电桩;当充电桩处于稳定输出时,断开电池包的主正继电器;当电池包中电池单体的最低温度低于第一预设温度时,发送包括第二请求电压的升压信号至充电桩。在本发明的实施例中,不对电池包的现有结构进行改变,仅通过在电池包需要加热时,通过分段控制,使充电桩在升压阶段升压供电,有利于提升电池包的加热功率,使得电池包能尽快进入充电阶段,缩短低温快充时间,且无成本增加。
Control method and control device for low-temperature fast charging of electric vehicle, and electric vehicle
一种电动汽车低温快充的控制方法、控制装置及电动汽车
2021-10-26
Patent
Elektronische Ressource
Chinesisch
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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