Unlock instant, AI-driven research and patent intelligence for your innovation.

RLS-based lithium battery full-working-condition self-adaptive equivalent circuit model

An equivalent circuit model, lithium battery technology, applied in the measurement of electricity, measurement of electrical variables, electrical digital data processing and other directions, can solve problems such as poor identification effect and divergence

Active Publication Date: 2020-12-29
HENAN POLYTECHNIC UNIV
View PDF10 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems: according to its equation characteristics, its identification effect on time-varying conditions is better, and its identification effect on time-invariant conditions is poor and may even diverge.
In fact, the change of working conditions has strong randomness. During the driving process of new energy vehicles, there are not only fast-changing working conditions, but also relatively stable working conditions at a uniform speed, which leads to the application of the least squares method. limitations, which are only applicable to time-varying conditions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • RLS-based lithium battery full-working-condition self-adaptive equivalent circuit model
  • RLS-based lithium battery full-working-condition self-adaptive equivalent circuit model
  • RLS-based lithium battery full-working-condition self-adaptive equivalent circuit model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] The RLS-based adaptive equivalent circuit model of the lithium battery under full working conditions includes the following contents:

[0101] S1. Establish a lithium battery DP offline model; the DP offline model is a DP equivalent circuit model. Such as figure 1Shown is the lithium battery DP off-line model structure of the present invention; It includes a voltage source U oc , an ohmic internal resistance R and two RC loops.

[0102] Among them, i is the current (assuming that the sign is positive when discharging, and the sign is negative when charging), U oc Indicates the open circuit voltage of the lithium battery, R is the ohmic resistance, and the two RC loops are R p 、C p with R s 、C s ; p Indicates the concentration difference polarization resistance of the lithium battery, C p Indicates the polarized capacitance of lithium battery concentration difference, R s Indicates the electrochemical polarization internal resistance, C s Indicates the electro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an RLS-based lithium battery full-working-condition self-adaptive equivalent circuit model. The method comprises the steps that S1, a lithium battery DP offline model is established; S2, an OCV-SOC curve of the lithium battery is acquired; S3, parameter identification is carried out on the DP offline model by utilizing a terminal voltage response curve when the lithium battery is discharged; S4, the residual parameters of the R-DP online model with the known ohmic resistance is identified by using the RLS with forgetting factors; and S5, the full-working-condition self-adaptive equivalent circuit model is established, specifically, when a working condition current is constant, a DP offline model identification result is output; and when the working condition currentis time-varying, an R-DP online model identification result is output. The method can significantly improve the model precision and the model adaptability, and is suitable for new energy automobile lithium battery equivalent circuit model parameter identification.

Description

technical field [0001] The invention belongs to the field of equivalent circuit modeling of a power battery of a new energy vehicle, and relates to an RLS-based self-adaptive equivalent circuit model of a lithium battery under full working conditions. It is suitable for the battery management system of new energy vehicles. Background technique [0002] With its superior characteristics, lithium batteries have gradually become the first choice for new energy vehicle power batteries. The characteristics of lithium batteries are complex, changeable and coupled with each other, which brings many challenges to battery management. The battery model is the mathematical representation of battery characteristics. An accurate battery model can not only reflect the relationship between battery characteristics and many influencing factors, but also provide an important basis for accurate state estimation. level is important. [0003] Common power battery models include electrochemica...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/388G01R31/392G06F30/367
CPCG01R31/367G01R31/392G01R31/388G06F30/367Y02E60/10
Inventor 郭向伟高岩司阳刘鹏辉杜少通朱军谢东垒
Owner HENAN POLYTECHNIC UNIV