Balanced charging and discharging control method and system for battery

Abstract

The invention relates to the technical field of battery management, and provides a battery balance charge and discharge control method and system, and the method comprises the steps: constructing a voltage comparator circuit model of a multi-section series lithium battery pack, and calculating the electric quantity fullness corresponding to the multi-section series lithium battery pack based on the voltage comparator circuit model; scheduling charging and discharging process data corresponding to the plurality of serially connected lithium battery packs from the control upper computer, constructing a volt-ampere characteristic curve corresponding to the plurality of serially connected lithium battery packs, and calculating a vitality index of the plurality of serially connected lithium battery packs; the method comprises the following steps: acquiring temperature sensing signals corresponding to a plurality of serially connected lithium battery packs in real time, performing signal conditioning on the temperature sensing signals to obtain standard temperature signals, converting the standard temperature signals into temperature digital values, and calculating thermal stability coefficients corresponding to the plurality of serially connected lithium battery packs based on the temperature digital values; and identifying an unbalanced battery pack and a to-be-balanced battery pack in the plurality of lithium battery packs connected in series, and executing balance control processing of the unbalanced battery pack to obtain a control result. The invention aims to improve the accuracy of battery balance charge and discharge control.

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