Active equalization system and method of power battery packs of electric bus

Abstract

The invention provides an active equalization system and method of power battery packs of an electric bus. The system comprises a capacitor battery management and monitoring module, a motor control module, an equalization control module and a capacitor battery circuit module. The capacitor battery circuit module comprises a main circuit switch, a first branch and a plurality of second branches connected in parallel. The first branch and the second branches are connected with the main circuit switch in series after being connected in parallel. The first branch is formed by connecting a super-capacitor pack and a branch switch in series. Each second branch is formed by connecting one power battery pack and a branch switch in series. The invention further provides the equalization method of the active equalization system of the power battery packs of the electric bus. The active equalization system is simple in overall structure and easy to obtain, the utilization rate of the power battery packs is increased, fault cost and maintenance cost caused by overcharge or over-discharge are reduced, and the active equalization system is suitable for being applied and popularized on a large scale.

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. [0002] Background technique [0003] 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...

AI Technical Summary

Problems solved by technology

[0003] 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 in electric buses Too many, to achieve the 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

Images