Minimum monomer voltage-based electric vehicle discharge protection method

Abstract

The invention discloses a minimum monomer voltage-based electric vehicle discharge protection method. During a battery discharge process, battery SOC and monomer voltage are determined; when the battery SOC is lower than a preset SOC lower limiting value or the minimum monomer voltage of the battery is lower than a lower limiting value of the monomer voltage, battery discharge is terminated. During the discharge process, SOC works as judgment condition; under a specific condition, discharge of the electric vehicle by discharge equipment is paused, and a minimum value of the power battery monomer voltage can be acquired; discharge of the electric vehicle can be protected according to dual judgment conditions of the SOC and the minimum monomer voltage value, so the battery can be effectivelyprotected; excessive discharge of the battery can be avoided; meanwhile, much electricity can be discharged by the electric vehicle; and electric vehicle energy storage efficiency failure due to excessive protection can be prevented.

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 minimum 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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