Electric vehicle battery residual power monitoring method and monitoring system thereof

Abstract

After a vehicle is used and before a battery is charged, the voltage and the temperature of an individual cell in the battery are detected. The detected voltage of individual cells is compared to determine a single cell with the smallest voltage. The voltage V1 and the position number of the single cell are recorded. According to the voltage V1, the percentage X of the residual power at the corresponding temperature is acquired. A battery pack is charged, and charging power is calculated. After charging, the voltage V2 of the single cell with the smallest voltage before charging is acquired. According to the voltage V2, the percentage Y of the corresponding residual power is acquired. The total available capacity Qz is calculated, and the total available capacity value is updated. The total available capacity of the battery can be accurately monitored. The total available capacity of the battery pack is updated in real time. The accuracy of ultimate residual power monitoring is ensured. The method and the system are easy for use.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a method for monitoring the remaining power of an electric vehicle storage battery and a monitoring system thereof. Background technique [0002] In an electric vehicle, the state of charge of the battery pack (including the available total capacity and remaining power) seriously affects the performance and endurance of the electric vehicle. State of charge and monitoring and management; in the prior art, the electric vehicle battery management system always evaluates the storage battery based on the fixed value at the factory, so as to evaluate the available total capacity according to the charging and discharging state. , due to the influence of temperature and aging state, its fixed total capacity changes and gradually decreases, that is to say, with the use of the battery, when the battery is fully charged, its total capacity is less than the factory fixed value, then the fac...

AI Technical Summary

Problems solved by technology

[0002] In an electric vehicle, the state of charge of the battery pack (including the available total capacity and remaining power) seriously affects the performance and endurance of the electric vehicle. State of charge and monitoring and management; in the prior art, the electric vehicle battery management system always evaluates the storage battery based on the fixed value at the factory, so as to evaluate the available total capacity according to the charging and discharging state. , due to the influence of temperature and aging state, its fixed total capacity changes and gradually decreases, that is to say, with the use of the battery, when the battery is fully charged, its total capacity is less than the factory fixed value, then the factory fixed value Monitoring and calculating the remaining power of the battery will seriously affect the calculation accuracy, and often the evaluation value indicates that the battery has tens of percent of power remaining, but the battery is dead, which seriously affects the use

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