Supercharge Your Innovation With Domain-Expert AI Agents!

An online calculation method for the internal resistance of a power battery

A calculation method and power battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as difficulty in applying BMS products, complex theory, and large amount of calculation.

Active Publication Date: 2021-03-19
苏州正力新能源科技有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used algorithms for calculating internal resistance are the recursive least squares method and the Kalman filter algorithm. These algorithms are still in the theoretical stage, the theory is complex, and the amount of calculation is so large that it is difficult to apply them to BMS products.

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
  • An online calculation method for the internal resistance of a power battery
  • An online calculation method for the internal resistance of a power battery
  • An online calculation method for the internal resistance of a power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0179] Step 1. Obtain the OCV curve and the corresponding internal resistance value of SOC at different temperatures through experimental testing. According to the OCV curve, calculate the average slope meanH of OCV to SOC in the range of 30%-70% of SOC, as follows:

[0180] Step 1.1, experimental test OCV;

[0181] Step 1.2, calculate the slope average value meanH of the OCV of SOC in the range of 30%-70% to SOC;

[0182] Step 1.3. Do HPPC experiments at -20, -10, 0, 10, 25, and 45 degrees to obtain the internal resistance values ​​corresponding to SOC at different temperatures;

[0183] Step 1.4, calculating the average value of the internal resistance of the SOC between 30% and 70%;

[0184] Step 1.5, set the internal resistance at 25 degrees to r 0 , internal resistance and r at different temperatures 0 By comparison, the internal resistance relative to r at different temperatures is obtained 0 Ratio table rateTemTable.

[0185] Step 2. During the driving process of t...

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 online calculating method for internal resistance of power batteries. The method includes obtaining an OCV curve and internal resistance values corresponding to an SOC underdifferent temperatures through experiment testing, and calculating the average gradient of the OCV on the SOC within a set range according to the OCV curve; collecting, by a BMS, actual working conditions during the driving of an automobile; setting high and low magnification intervals with the same sizes according to actual data automatic choice behavior magnification; utilizing a time decay algorithm to filter driving working conditions affected by voltage delay and filtering driving working condition data of the SOC exceeding the set range; respectively counting the average voltage, average magnification and average SOC values in the high and low magnification intervals in the filtered driving working condition data; and adopting a battery characteristic based internal resistance calculating formula to update the internal resistance of a battery. Thus, the online calculating of the internal resistance of the power battery can be realized; and the method has advantages of being highin robustness, small in calculated amount and strong in practicality.

Description

technical field [0001] The invention relates to the technical field of power lithium battery systems for new energy vehicles, in particular to an online calculation method for the internal resistance of a power battery. Background technique [0002] In the battery management system of new energy vehicles, internal resistance, as an important parameter, plays an important role in the estimation of SOC and the evaluation of the state of health of the battery. At present, most BMS manufacturers use experimental testing methods to obtain battery internal resistance. This method can obtain accurate battery internal resistance, but this method has major defects. The internal resistance of the battery will gradually change with the aging of the battery, and the use of each car is different, and the degree of aging is different, so the resistance after aging is naturally different. The internal resistance obtained by the experimental test is the internal resistance value of the new...

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 Patents(China)
IPC IPC(8): G01R31/389
Inventor 孙景宝王志刚李中飞刘祥田扩
Owner 苏州正力新能源科技有限公司
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com