BMS detection precision calibration device and method for electric automobile battery module

Abstract

The invention discloses a BMS detection precision calibration device and a method for an electric automobile battery module. According to the technical scheme of the invention, a battery module, a BMS slave board and a BMS main board are arranged in a constant-temperature box. Meanwhile, the current value, the voltage value, the SOC value and the temperature value of the battery module at various ambient temperatures are collected by charging and discharging equipment and temperature acquisition equipment, with the precision thereof higher than the BMS device, and the BMS slave board at the same time. After that, the current value, the voltage value, the SOC value and the temperature value of the battery module, collected by the charging and discharging equipment and the temperature acquisition equipment, are adopted for calibrating the precision of the current value, the voltage value, the SOC value and the temperature value of the battery module collected by the BMS slave board. According to the technical scheme of the invention, the device and the method are applicable to the wide temperature range from 40 DEG C to 85 DEG C, so that the obtained BMS detection precision is higher than that of the industry standard. Moreover, the BMS detection precision of the electric automobile in various working environments is obtained, so that a more reliable and accurate foundation is provided for the control of the electric automobile. The overall control effect of the electric automobile is improved.

Description

technical field [0001] The invention relates to the field of electric vehicle testing, in particular to an electric vehicle battery module BMS detection accuracy calibration device, and an electric vehicle battery module BMS detection accuracy calibration method using the device. Background technique [0002] BMS (BATTERY MANAGEMENT SYSTEM, battery management system) is the link between the battery and the user. BMS can improve the utilization rate of the battery, prevent the battery from overcharging and overdischarging, prolong the service life of the battery, and monitor the state of the battery. [0003] The main functions of the BMS include: accurately estimating the SOC (State of Charge, state of charge) of the power battery pack, that is, the remaining power of the battery, ensuring that the SOC is maintained within a reasonable range, and preventing damage to the battery due to overcharging or overdischarging , and display the remaining energy of the electric vehicle...

AI Technical Summary

Problems solved by technology

This method has certain disadvantages. For example, the calibration of its accuracy is generally carried out after high temperature and low temperature resistance and returning to room temperature, which cannot truly describe the BMS module of the electric vehicle battery in a real high temperature and low temperature environment. The detection accuracy of the BMS cannot be known under working conditions such as hot summer and cold winter, which affects the control accuracy of the control system

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