Active balancing system and method for power battery pack of electric bus

Abstract

The present invention provides an active equalization system and method for a power battery pack of an electric bus. The system includes a capacitor battery management and monitoring module, a motor control module, an equalization control module, and a capacitor battery loop module; the capacitor battery loop module includes a trunk switch, a second A branch and a plurality of second branches connected in parallel, the first branch is connected in parallel with the plurality of second branches and then connected in series with the trunk switch, and the first branch is composed of a supercapacitor group and a branch switch in series , each second branch is composed of a power battery pack and a branch switch in series. The invention also provides an equalization method for the active equalization system of the power battery pack of the electric passenger car. The invention has a simple overall structure, is easy to implement, improves the utilization rate of the power battery pack, reduces failures and maintenance costs caused by overcharging or overdischarging, and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of equalization of power battery packs, in particular to an active equalization system and method for power battery packs of electric buses. Background technique [0002] At present, most of the power battery equalization technologies for electric buses are concentrated in the field of single battery equalization. The equalization technology is divided into active equalization and passive equalization. Most of the passive equalization uses the high-voltage monomer to reduce the voltage through the discharge circuit, which belongs to lossy equalization and reduces The energy utilization rate of the whole group of batteries; the active equalization technology of the monomer has great advantages over the passive equalization. It can charge the high-voltage monomer to the low-voltage monomer without losing the energy of the whole battery. However, the number of batteries used by electric buses If there are too m...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the power battery equalization technologies for electric buses are concentrated in the field of single battery equalization. The equalization technology is divided into active equalization and passive equalization. Most of the passive equalization uses the high-voltage monomer to reduce the voltage through the discharge circuit, which belongs to lossy equalization and reduces The energy utilization rate of the whole group of batteries; the active equalization technology of the monomer has great advantages over the passive equalization. It can charge the high-voltage monomer to the low-voltage monomer without losing the energy of the whole battery. However, the number of batteries used by electric buses Too many, to achieve active balancing of the monomer will inevitably increase the corresponding number of equalization circuits and control circuits, and the battery pack system has a complex structure and difficult maintenance, which limits its wide application

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