Charging and discharging battery replacing method for electric vehicle and battery replacing device of charging and discharging battery replacing method

Abstract

The invention provides a charging and discharging battery replacing method and device for an electric vehicle, and the method comprises the specific steps: an AC / DC controller monitors the change of charging demands in real time, and provides a time sequence according to the charging demands of a battery box and a charging pile of the electric vehicle; when the charging pile and the battery box need to be charged at the same time, the AC / DC controller compares the capacity sum S of the charging requirements of the charging pile and the battery box with the charging capacity S0 of the AC / DC charging and discharging unit, and corresponding operation is completed; when the charging pile and the battery box do not need to be charged at the same time, the AC / DC controller compares the capacity sum S of the charging requirements of the charging pile and the battery box with the charging capacity S0 of the AC / DC charging and discharging unit, and corresponding operation is completed; and according to the voltage and current of the battery fed back by the charging pile battery management system and the electric vehicle battery box management system in real time, the output voltage and current of the charging pile are adjusted, and charging is completed. Charging and battery swapping can be provided for the electric vehicle, electric energy is provided for the power grid according to power grid dispatching, and the utilization rate and economic benefits of the charging and battery swapping station are effectively improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging and exchanging, in particular to a charging, discharging and exchanging method for electric vehicles and a power exchanging device thereof. Background technique [0002] In recent years, with the gradual popularization of electric vehicles and the continuous construction of charging and replacement stations, the demand for electricity has gradually increased, which will have a certain impact on the power grid. Affect the normal life of residents. Existing charging stations or swapping stations only provide charging and power swapping services for electric vehicles, and fail to interact with the power grid. Electric vehicles and swapping battery boxes cannot be used as energy storage units to discharge the power grid. [0003] In the current charging methods for batteries, there are three mainstream charging methods: the specific implementation process of the constant current and...

AI Technical Summary

Problems solved by technology

[0003] In the current charging methods for batteries, there are three mainstream charging methods: the specific implementation process of the constant current and constant voltage charging method is divided into three processes: pre-charging, constant current charging and constant voltage charging. Eliminate the polarization phenomenon of the battery, and the charging speed is slow; the specific implementation process of the variable current intermittent charging method is divided into two processes: the variable current intermittent charging stage and the constant voltage charging stage. However, the circuit of this charging mode is relatively complicated and the cost is high; the specific implementation process of the pulse charging method is consistent with the process of the constant current and constant voltage charging method, and at the same time, a large current pulse is used in the pulse charging stage. The battery is charged. This method breaks the shackles of the optimal charging current curve for battery charging. The charging efficiency is high, the temperature change is small, and the impact on battery life is small. However, a power supply with a current limiting function needs to be provided separately, which greatly increases the charging cost.

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