Method for preventing small storage battery from being fed when charging electric vehicle
A technology for electric vehicles during charging, applied in the field of electric vehicle power management, can solve problems such as stop charging, overheating of chargers, and small battery feeding, and achieve the effects of prolonging service life, alleviating heat generation, and complete and compact structural design
Pending Publication Date: 2019-03-22
SHANDONG KINGOLD AUTOMOBILE CO LTD
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The invention discloses a method for preventing a small storage battery from being fed when charging an electric vehicle, wherein when a charger is working, a battery management system (BMS) is awakened through a hard wire, at the same time, a vehicle control unit (VCU) and a direct current direct current converter (DCDC) need to be awakened. When the VCU detects that the whole vehicle is in a charging state, a pre-charge circuit of a motor controller and a main positive relay are sequentially closed, the DCDC is enabled to be in a working state by preset enabled DCDC for charging a small storage battery. When the charging process is over or finished, the enabled DCDC is controlled to close by the VCU, then the main positive relay of the motor is switched off to make the motor enter a discharging state, and after finishing discharging, the DCDC and the VCU enter a dormant state. The method has the advantages that the situation that the charger overheats during charging is relieved, theservice life of the charger is extended, the problem that the charging is stopped due to overheat of the charger in the charging process is solved, the charging time is shortened, and the situation that the small storage battery is fed due to the operation of a heat-removal system in the charging process is effectively relieved.
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