A new energy vehicle power battery passive equalization control method

Abstract

The present invention relates to the technical field of battery balance control, in particular to a new energy vehicle power battery passive balance control method, including every time T n (material, structure), to perform a round of battery cell voltage query; when there are one or more cells in the battery, the actual voltage U n (tep, time) and the absolute value of the average voltage difference of the battery cell is outside the set safe voltage range, then perform passive equalization control; the passive equalization control process is: calculate the theoretical total capacity SOC of the battery 理论 and battery real-time power SOC 实时 The difference SOC', by querying the SOC range-balanced current I comparison table to determine the SOC range to which SOC' belongs, and perform balanced control according to the balanced current corresponding to the SOC range in the SOC range-balanced current I comparison table. Passive balancing is performed when the power difference between them reaches the threshold, and the difference area of ​​power is fully considered, so that the balancing current can be controlled in a reasonable small area to ensure the accuracy of passive balancing control.

Description

technical field [0001] The invention relates to the technical field of battery equalization control, in particular to a passive equalization control method for a power battery of a new energy vehicle. Background technique [0002] The power battery is the energy source of electric vehicles. It not only provides electric energy for the driving of electric vehicles, but also provides electric energy for the electronic auxiliary equipment on the vehicle. It is difficult to achieve complete consistency in the performance of the single cells of the battery pack in series, and the environmental differences in the use process will exacerbate the inconsistency between the performance of the single cells of the battery pack, resulting in the deterioration of the imbalance between the cells. Therefore, during the use of the battery pack, it is necessary to improve the inconsistency between the cells through balanced control, improve the energy utilization efficiency of the battery pac...

AI Technical Summary

Problems solved by technology

This method fully considers the real-time values ​​of the real-time voltage and current of the cell, but does not consider the influence of the balanced current, temperature and time.

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