Electric automobile power battery equalization management system and method

Abstract

The invention provides an electric automobile power battery equalization management system and method. Battery cells of a battery pack of the electric automobile power battery equalization management system are connected in series and sequentially divided into M identical battery modules. All the battery modules are connected with corresponding resistor equalization circuits and capacitor equalization circuits as well as a coaxial multi-winding DC-DC converter. A microcontroller is connected with a battery management system so as to acquire battery pack status data. Signals of the microcontroller are connected with all the resistor equalization circuits and the capacitor equalization circuits and further connected with a pulse drive unit and a converter. According to the equalization management method, the microcontroller first acquires nominal parameters of the battery pack, so that control parameters are determined; then, the microcontroller acquires current operation variables, so that the maximum deviation and the dispersion degree of voltage of the battery modules are calculated; according to different states of the battery pack, namely charging, quiescence and discharging, different judgment standards for starting equalization are selected, the converter is used for equalization between the modules, the resistor equalization circuits and the capacitor equalization circuits are used for equalization between the battery cells. According to the electric automobile power battery equalization management system and method, advantages of various equalization circuits are complementary to one another, so that equalization speed is increased, and equalization efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of power control of new energy vehicles, specifically an electric vehicle power battery balancing management system and a balancing management method. Background technique [0002] At present, new energy vehicles are a hot topic in automobile development research, and electric vehicles are even more focused. The power battery pack is a key component that restricts the industrialization process of electric vehicles. There is a "barrel effect" in the power battery pack, that is, the battery pack and its performance are determined by the worst battery among them. Therefore, the consistency of the cells in the battery pack is one of the key indicators to judge the performance of the battery pack. Studying the battery balancing management system has become a necessary means to solve the inconsistency of cells in the battery pack. However, battery balancing management technology at home and abroad mainly focuses...

AI Technical Summary

Problems solved by technology

Although this patent reduces the complexity of the equalization method to a certain extent, it is mainly implemented with passive equalization circuits, which reduces the equalization speed and equalization efficiency, and uses a single variable—the remaining battery power as the judgment condition for the equalization operation, ignoring The impact of the battery working state and the driving state of the electric vehicle on the balancing operation cannot be fully and realistically reflected in the battery balancing situation.

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