Power battery actual capacity estimation method

A technology of actual capacity and power battery, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of affecting accuracy, battery monitoring and management errors, battery overcharging, etc., to achieve high reliability and fast calculation speed Effect

Active Publication Date: 2013-11-20
CHONGQING CHANGAN AUTOMOBILE CO LTD
View PDF6 Cites 39 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the number of cycles and usage time increase, the battery will gradually age and the actual capacity will gradually decrease
If the actual capacity cannot be updated regularly, it will affect the accuracy of estimating the battery SOC value using the AH integral algorithm and the accuracy of estimating the battery SOH using the actual capacity of the battery
As a result, errors in the monitoring and management of the batt

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
  • Power battery actual capacity estimation method
  • Power battery actual capacity estimation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] In order to facilitate the understanding of those skilled in the art, the implementation process of the present invention will be described below in conjunction with the accompanying drawings and specific implementation examples.

[0024] The specific steps of this embodiment are as follows:

[0025] Step 1: Detect battery current (I), voltage (V) and temperature (T) to obtain real-time battery data;

[0026] Step 2: On the basis of the mathematical model F(OCV,Cap,V,I,T)=0, use the system identification algorithm to estimate the open circuit voltage (OCV) and actual capacity (Cap) of the power battery in real time; The mathematical model of is the state noise; v is the measurement noise; V p is the battery polarization voltage; OCV is the battery open circuit voltage; R o is the internal resistance of the battery; Cap is the actual capacity of the battery; V is the terminal voltage of the battery; SOC is the state of charge of the battery.

[0027]

[0028] The...

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 provides a power battery actual capacity estimation method. The estimation method is based on a battery mathematical model, the open-circuit voltage and capacity of a battery are identified by utilizing a system identification algorithm, the battery capacities, corresponding to the battery open-circuit voltages OCV1 and OCV2, are respectively recorded as Cap1 and Cap2, meanwhile the battery capacity Cap3 is estimated by utilizing an AH integral algorithm, and then the Cap1, Cap2 and Cap3 are weighted and filtered to obtain battery capacity Cap0, and finally, the Cap0 is filtered to obtain the actual battery capacity in accordance with the engineering application requirement. The power battery actual capacity estimation method has the advantages that the influence of the identification algorithm and the battery operating conditions on the actual capacity estimation can be avoided; and the estimation method is applicable to estimating the actual capacity of power batteries for pure electric vehicles and power batteries for hybrid electric vehicles.

Description

technical field [0001] The invention relates to a method for estimating the actual capacity of a power battery. Background technique [0002] With the increasingly prominent energy and environmental issues, pure electric vehicles and hybrid vehicles are highly valued by countries all over the world. Therefore, the development of electric vehicles with excellent performance lithium batteries as the power source has become the current research direction. In order to safely use lithium batteries during the operation of electric vehicles, it is necessary to use a dedicated battery management system to monitor lithium batteries. The key indicators monitored are the state of charge (State of Charge, SOC) and the state of health (State of Health, SOH) of the lithium battery, and the estimation accuracy of the SOC value and SOH value is directly or indirectly related to the actual capacity of the battery . The actual capacity of the battery is difficult to obtain when the battery...

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
IPC IPC(8): G01R31/36
Inventor 赵天林姚振辉郑英邓柯军袁昌荣杨辉前
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap