Device and method for active equalization hierarchical control of power battery pack

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a device and method for active equalization hierarchical control of a power battery pack, and the device comprises a main controller, and a plurality of bottom equalization modules, a top equalization module, a selection switch and a plurality of switch matrixes which are connected with the main controller. The main controller judges the single batteries needing to be equalized through an equalization control strategy according to SOC values of the single batteries and sends driving signals to the top-layer equalization module, the bottom-layer equalization module, the selection switch and the switch matrix through a control bus, and the bottom equalization modules realize equalization of the single batteries in the same battery pack according to the driving signals. The top equalization module sequentially controls the selection switch and the corresponding switch matrix according to the driving signal to realize the equalization of the single batteries in different battery packs or the equalization between the battery packs. According to the equalization device, the inter-group equalization mode is more flexible, the energy transfer efficiency is high, the balancing speed is high, and the energy transfer control capability is higher.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a device and method for active equalization and layered control of a power battery pack. Background technique [0002] The application of power batteries is becoming more and more extensive. However, in the manufacturing process of batteries, due to the subtle differences in the content of various raw materials and the subtle fluctuations in the production process, there are small differences in electrode thickness, pore structure and electrode porosity. As a result, there will be certain inconsistencies in the performance of the manufactured batteries in terms of capacity, voltage, and internal resistance. As the number of charge and discharge cycles increases, this inconsistency will intensify, which requires battery equalization. As an electric vehicle power battery system, the existing balance control device for the battery pack is to balance the adjacent cells ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above technical problems, the present invention proposes a device and method for active equalization and layered control of power battery packs, which overcomes the inflexible inter-group equalization mode, large energy loss, low transfer efficiency, and equalization speed existing in existing battery equalization devices. slow, poor control over energy transfer, etc.

Images