Single-cell EKF (extended Kalman filter) and UKF (unscented Kalman filter) estimation comparing method

Abstract

The invention discloses a single-cell EKF (extended Kalman filter) and UKF (unscented Kalman filter) estimation comparing method. The single-cell EKF and UKF estimation comparing method includes placing an EKF estimation block diagram and a UKF estimation block diagram of a single lithium cell in the same simulation environment, discharging for 3000 s by 1C pulse discharging current, and measuring estimation results of EKF and UKF with the same initial state covariance value and the initial measurement covariance value; placing EKF estimation block diagrams and UKF estimation block diagrams of a lithium cell pack in the same simulation environment, discharging for 1400 s by constant pulse discharging current, and measuring estimation results of EKF and UKF with the same initial state covariance value and the initial measurement covariance value. The single-cell EKF and UKF estimation comparing method can overcome the defects of short service life, poor safety and reliability and the like of the prior art and has the advantages of long service life and high safety and reliability.

Description

[0001] technical field [0002] The invention relates to the technical field of lithium batteries, in particular to a method for estimating and comparing the EKF and UKF of a single battery. Background technique [0003] In recent years, the automobile industry has developed rapidly, especially in China. From 2004 to 2012, the number of automobiles in my country has increased. As of 2012, the number of private automobiles in my country has reached 93.09 million, and the growth trend will be obvious in the next few years. A series of problems, such as energy security and environmental pollution, have become the key factors restricting the development of automobiles. In terms of energy security, the growth trend of my country's oil production and consumption from 2004 to 2010. As of 2010, my country's dependence on foreign oil has reached 53%, exceeding the warning line of 50%. The energy consumption of automobiles accounts for nearly 60% of the total energy consumption of re...

AI Technical Summary

Problems solved by technology

[0007] (2) Lithium batteries are poor in safety, and overcharging and overdischarging must be prevented;

[0008] (3) SOC is an important parameter when electric vehicles are running, and it is used to judge whether the battery is overcharged. However, the lithium battery itself is a closed and complex electrochemical reaction, and its estimation is difficult.

[0009] In the process of realizing the present invention, the inventor found that there are at least defects such as short service life, poor safety and low reliability in the prior art