Battery pack balance control method of SOC

Abstract

The invention discloses a battery pack balance control method of an SOC and belongs to the technical field of control. According to the purposes of the battery pack balance control method of the SOC,based on the SOC estimation result and by adopting a model prediction control algorithm, a battery pack balance system is achieved, the inconsistency between single bodies in a battery pack is improved, the battery balance time is effectively shortened, the energy consumption is effectively reduced, and the battery pack balance control method is based on the SOC. The control method includes the steps that a second-level two-way balance circuit based on a power inductor is designed; a second-order RC ring equivalent circuit model considering temperature is built; battery SOC estimation considering capacity fading is performed, and double Kalman estimators are designed to perform battery SOC estimation; and battery pack balance control is performed based on model prediction control. According to the battery pack balance control method, on the basis that the temperature and the capacity fading are considered, the battery SOC estimation precision is improved, and an accurate balance indexis provided for battery pack balance.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a battery balancing technology of an electric vehicle. Background technique [0002] With the rapid development of science and technology and the continuous progress of society, the living standards of people all over the world have also been continuously improved, and the number of automobiles has also increased significantly, which has led to the excessive consumption of the earth's resources, especially some non-renewable energy sources, such as oil, etc. . my country is a big oil importer, and the continuous increase in car ownership has led to an increase in our country's dependence on oil imports. Therefore, the development of electric vehicles is an inevitable choice for our country. The key part of electric vehicles is the battery, and the current batteries generally include nickel-metal hydride batteries, lithium-ion batteries and fuel cells. Considering th...

AI Technical Summary

Problems solved by technology

The battery balance evaluation index is an important part of the balance control. The selection of the balance index will seriously affect the effect of battery balance and affect the evaluation of battery consistency.

Images