Overload proof power battery charging-discharging monitoring control method

Abstract

The invention provides an overload proof power battery charging-discharging monitoring control method. The method comprises the following steps: calculating the temperatures of a battery to be testedand the extreme current charging/discharging rates at different SOCs (Systems on Chip) according to a voltage change ratio; determining different temperatures and charging/discharging voltage upper limits at different SOCs according to the maximum current charging/discharging ratio; judging whether failure duration exceeds a preset unexpected duration or not by taking the current charging/discharging ratio under each temperature as an overload current threshold value, and the charging voltage upper limit and discharging voltage lower limit at different temperatures and different SOCs as battery aging failure threshold values, and transmitting an alarm signal; and calibrating the power battery capacity after aging, and calculating a charging voltage upper limit and a discharging voltage upper limit under the current battery capacity. The maximum current loading ratio and voltage working range are taken as monitoring objects of the whole battery system in working, so that the overload proof power battery charging-discharging monitoring control method has the advantages of convenience in operation, high reliability, easiness in judging the working state, recognition of the failure type, and improvement on the system feasibility and reliability.

Description

technical field [0001] The invention relates to the technical field of power battery supervision, in particular to a power battery charge and discharge supervision control method for preventing overload. Background technique [0002] As an energy storage device, power batteries play an important role in daily life. In order to reduce the occurrence of power battery abuse, it is necessary to monitor and diagnose the state of the power battery in real time. Therefore, it is of great significance and work value to research and develop a power battery fault diagnosis system. The power battery fault diagnosis system is an important part of the battery management system of various materials. The system can judge the possible faults of the power battery by monitoring the battery state data such as charging and discharging current, voltage, temperature, etc. in real time, and give corresponding solutions. Treatment measures to avoid serious failure of the power battery, ensure the ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems that the existing vehicle power battery system is subject to various coupling stress impacts in real time, which may easily cause the aging degree of the power battery pack to be inconsistent, resulting in frequent overcharging / discharging, overloading, or low energy utilization of the single battery, the present invention A power battery charging and discharging supervision and control method to prevent overload is proposed to limit the loading threshold of the power battery pack under different environmental stresses to ensure the safety and reliability of the system and prolong the service life of the vehicle

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