Centralized initiative balancing device for electric vehicle battery management system

Abstract

The invention relates to a centralized initiative balancing device for an electric vehicle battery management system. The centralized initiative balancing device comprises a balancing controller, a guide rail, balancing executing mechanisms, a balancing arm, balancing contacts A, balancing wiring harnesses, a communication bus and balancing contacts B. According to the centralized initiative balancing device, balancing can be carried out on specific units in all unit batteries to enable the specific units to keep the consistency with other unit batteries, and the service life of a whole battery pack is prolonged. A centralized balancing control mode is adopted, and battery packs with the huge amount can be simultaneously balanced through the one or more balancing executing mechanisms. The balancing executing mechanisms are driven by motors to move through the guide rail, accurate location in three-dimensional space can be achieved, and sufficient and reliable contact between the balancing executing mechanisms and the balancing contacts is ensured. The balancing executing mechanisms can bear large-current charging and large-current discharging, therefore, rapid balancing on the unit batteries can be achieved, the balancing time is shortened, and the balancing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and relates to a battery active equalization device, in particular to a centralized active equalization device for a battery management system. Background technique [0002] Power batteries are generally connected in series. There are inconsistencies in the manufacture, initial capacity, voltage, and internal resistance of the individual batteries. The temperature of each individual battery in the battery pack is not exactly the same. The phenomenon of overcharge and overdischarge of the battery will cause the capacity of individual battery cells to be lower than other battery cells in severe cases. In order to protect the power batteries connected in series, the discharge of the entire battery pack has to be stopped, causing great damage to the service time and capacity of the entire battery pack. In fact, the actual released capacity of a group of batteries is determined by the lithi...

AI Technical Summary

Problems solved by technology

During the charging process, the battery cell that is discharged first will be fully charged first, so that the phenomenon of overcharging will occur, so that the entire battery pack cannot be fully charged normally.

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