Rapid balance control method and device for power battery pack

Abstract

The invention discloses a rapid balance control method for a power battery pack. SoC of battery cells and battery packs is detected, the imbalance state of each pack is judged according to the SoC of each battery pack, the battery packs needing energy transfer-out, the amount of energy needing to be transferred out, the battery packs needing energy transfer-in and the amount of energy needing to be transferred in are judged, one battery pack needing energy transfer-out is selected according to the SoC of each battery pack, one battery cell needing energy transfer-out is selected from the battery pack, one battery pack needing energy transfer-in is selected, one battery cell needing energy transfer-in is selected from the battery pack, and energy balance is carried out; the imbalance state of the battery cells in the packs is judged according to the SoC of the battery cells in the packs, one pair of battery cells is selected according to the requirements of energy balance, and energy balance is carried out except for the selected battery packs participating in inter-pack balance. The invention further discloses a rapid balance control device for the power battery pack. The device is used for balancing energy of the battery cells.

Description

technical field [0001] The invention relates to a fast equalization control method for a power battery pack and a fast equalization control device for a power battery pack. Background technique [0002] The new energy vehicle power battery pack is composed of multiple single cells in series, and its state and life directly affect the performance of the vehicle. Due to the influence of factors such as unstable production process and inconsistent use environment, there is always a certain degree of inconsistency among the individual cells in the battery pack. The overall performance of the battery pack with balanced management will be improved to a certain extent. The battery balanced control management will help to improve the overall capacity of the battery pack and the depth of charge and discharge of the battery. It is necessary to perform balanced management of the battery pack. [0003] At present, battery balancing control mainly includes shunt resistance method, DC / DC...

AI Technical Summary

Problems solved by technology

[0003] At present, battery balancing control mainly includes shunt resistance method, DC / DC converter method, switched capacitor method, flying capacitor method, etc. These methods consume a lot of energy and take a long time. Find a more reasonable, efficient and convenient method. The method of electric vehicle battery balance control management, which has been one of the contents that the applicant is committed to researching

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