Method for detecting electric quantity of lithium ion battery for electric vehicle

A lithium-ion battery and power detection technology, applied in the direction of measuring electric variables, measuring electricity, measuring devices, etc., can solve problems such as increased internal resistance of lithium batteries, reduced total storage capacity, and large cumulative errors

Inactive Publication Date: 2015-05-06
YUYAO YIWEI ELECTRONICS TECH
View PDF0 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This detection method is intuitive, but long-time integration will cause a large cumulative error
[0005] As the number of charging and discharging

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
  • Method for detecting electric quantity of lithium ion battery for electric vehicle
  • Method for detecting electric quantity of lithium ion battery for electric vehicle
  • Method for detecting electric quantity of lithium ion battery for electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The following examples are further explanations and supplements to the present invention, and do not constitute any limitation to the present invention.

[0032] Below, the patent solution of the present invention will be further described by means of the accompanying drawings and examples.

[0033] The battery power detection method and system provided by the patent of the present invention adopt external detection circuits connected at both ends of the battery. For the internal resistance detection module, such as figure 1 , After each charge is completed, first measure the open circuit voltage E of the battery, then manually close the switch S, connect an external resistor, and measure the voltage U across the fixed load R and the loop current I. Available internal resistance R0 = (E-U) / I. Disconnect S after measuring. Get the internal resistance R0 of this cycle, and pass this value to the MCU.

[0034] When the electric vehicle is working, this internal resis...

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 method for detecting the electric quantity of a lithium ion battery for an electric vehicle. The method comprises obtaining a function expression of an OCV-SOC (Open Circuit Voltage and State Of Charge) curve by an interpolation method in the case of constant discharge current and setting the road conditions during usage to select a minimum error of curve reference table; measuring the OCV of the lithium ion battery under the fully-charged state and a current value under external loads, obtaining the internal resistance of the lithium ion battery through a loop current value, the load size, the load voltage and the OCV and meanwhile recording the total number of charging and discharging of the battery; collecting the working loop current of the lithium ion battery and the voltage of each end of the battery every T1 time when the lithium ion battery works, obtaining the voltage of the equivalent capacitance through the conversion according to the internal resistance, performing the difference operation on the voltage, performing the integral operation on the time through the current, calculating the ratio of the voltage and the current and obtaining the residual voltage through the comparison on a newly proposed reference curve.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to the detection technology of lithium ion battery power. Background technique [0002] With the growth of population and the consumption of petroleum resources, people pay more and more attention to environmental protection. Due to the use of electric energy, a clean secondary energy source, electric vehicles have advantages over traditional fuel vehicles in terms of environmental protection and economy. At present, there are few charging stations for electric vehicles, and the driving range of electric vehicles is short. These problems are likely to bring inconvenience and anxiety to electric vehicle users. In this case, the remaining power detection technology in the battery management technology can bring very important information to the user. [0003] The traditional methods for detecting the remaining power of lithium batteries mainly include the relationship cur...

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 周燕敏
Owner YUYAO YIWEI ELECTRONICS TECH
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