Individual maximum voltage-based electric vehicle discharging protection method

Abstract

The invention discloses an individual maximum voltage-based electric vehicle discharging protection method. The method comprises the steps of judging whether current temperature of batteries is in permissible discharging temperature ranges or not in the battery discharging process, if not, stopping discharging, and if so, calculating current discharging rates of the batteries, determining target discharging rates of the batteries according to the current temperature and the current discharging rates of the batteries, and calculating a battery discharging individual maximum voltage protection threshold V1 according to the target discharging rates of the batteries; and ending discharging when the current individual maximum voltage Vmax of the batteries is smaller than or equal to the batterydischarging individual maximum voltage protection threshold V1, or else, continuing to discharge. According to the protection method, by taking the individual maximum voltage of the batteries as protection points, a calculation method of the individual maximum voltage protection threshold is provided under the condition of comprehensively considering the factors, such as the temperature and the discharging rates of the batteries during discharging and a battery voltage difference range; and the individual maximum voltage of the batteries is protected, so that an over-discharge risk of the batteries can be completely eradicated effectively.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle discharge, and in particular relates to an electric vehicle discharge protection method based on the highest single voltage. Background technique [0002] The rapid development of electric vehicles has brought about major changes in the automotive industry, and has also brought a new operating model to the energy storage industry. Electric vehicles use the on-board power battery system as the energy source for vehicle power, which itself is a new form of energy storage—mobile energy storage. During the discharge process of electric vehicles, whether it will cause damage to personal safety, vehicle safety, and equipment safety is the focus of vehicle users and charging and discharging equipment operators. The discharge process of the power battery is a process in which chemical energy is converted into electrical energy. When an electric vehicle is discharged to the outside, it is necessa...

AI Technical Summary

Problems solved by technology

[0003] At present, when electric vehicles are discharged through the charging interface through the discharge equipment, the BMS does not provide information on the voltage of the battery cells to the discharge equipment, so the discharge equipment cannot perform traditional low-voltage protection on the power battery of the electric vehicle.

There is no effective monitoring of the state of the battery during the discharge process. This blind and extensive discharge cannot effectively protect the battery and will have a serious impact on the safety and life of the battery.

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