Passive balance control method and system for electric vehicle battery management system

Abstract

The invention relates to a passive equalization control method and system of an electric vehicle battery management system. The method includes the following steps: acquiring the working mode of the battery system; when the battery system is in a static, quasi-static, or external charging mode, acquiring the real-time unit charge state value of the unit battery, and determining the first target balancing unit; Control it to perform discharge equalization, and detect the change of the state of charge of the cell in real time, judge the correctness of the equalization response and control the equalization off; when the battery system is in the driving discharge mode, obtain the real-time cell voltage of the battery cell, and determine the second The target is to balance the cell; control it to perform discharge equalization, and detect the voltage change of the cell in real time, judge the correctness of the equalization response and control the equalization to close. The invention solves the problems that unreasonable opening and closing of the equalization will reduce the equalization efficiency, that the environment of the whole vehicle is easy to omit equalization opportunities, and that the open-loop equalization management leads to low accuracy and precision.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a passive equalization control method and system for an electric vehicle battery management system. Background technique [0002] The equalization technology of the battery system is an important algorithmic function of the electric vehicle battery management system. In electric vehicles, the consistency of the battery cells will directly affect the overall performance of the battery pack. If the consistency of the battery cells is poor, on the one hand, it will affect the overall performance of the entire battery pack and thus affect the performance of the vehicle, resulting in a discount on the comfort of the vehicle. ; On the other hand, a battery pack with poor consistency of battery cells will cause the battery to be overcharged or overdischarged, making the battery in an incorrect state of use for a long time, affecting the performance and life of the battery. D...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a passive equalization control method and system of an electric vehicle battery management system, which solves the problems caused by unreasonable opening and closing of the equalization in the related art, which will reduce the equalization efficiency, does not take into account the easy omission of equalization opportunities in the vehicle environment, and the open-loop equalization management causes Issues with low accuracy and precision

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