Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Rapid lithium battery capacity degradation early warning method

A lithium battery and capacity technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of waste of test costs, time-consuming, and termination of tests, etc., and achieve the effect of stable calculation results

Active Publication Date: 2021-02-05
BEIHANG UNIV
View PDF9 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Second, the test data of the diving battery sample has an impact on the overall life analysis
The cost of battery charge and discharge cycle test is high and time-consuming, so the test cannot be terminated in time when the diving point is about to appear or shortly after it appears, which brings a large waste of test cost, including economic cost and time cost

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
  • Rapid lithium battery capacity degradation early warning method
  • Rapid lithium battery capacity degradation early warning method
  • Rapid lithium battery capacity degradation early warning method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0061] In practice, lithium-ion battery capacity degradation data contains a lot of noise. These noises show the characteristics of local fluctuations in the degradation curve, but have no significant impact on the long-term degradation trend. Therefore, in order to ensure the robustness of data processing, it is necessary to perform smoothing and denoising preprocessing on capacity degraded data. In the present invention, the locally weighted scatter-point regression smoothing (LOWESS) method is used to process the capacity degradation data, and the long-term trend is retained while removing the local fluctuation in the degradation process. The specific implementation is as follows:

[0062] 1. Take a point x 1 As the center, determine a data with an interval length of f, which depends on q=fn, where q is the number of observations participating in local regression, f is the number of observations participating in local regression to the number of observations Proportion, ...

specific Embodiment

[0109] The present invention uses the test data of Ningde Times New Energy Technology Co., Ltd. to verify the feasibility and effectiveness of the proposed lithium-ion battery life prediction method (note: the battery used in the test is a pouch battery specially used in the product design stage , which differ from the batteries used in the company's real products).

[0110] Lithium battery samples under 25°C test conditions are selected for analysis and verification. This method uses four samples for case analysis, including two diving samples and two normal samples. The numbers of the four samples are marked as follows:

[0111] Normal samples: N1, N2

[0112] Diving samples: D1, D2

[0113] The original degradation curves of the four battery samples are as Figure 5 Shown:

[0114]Step 1: Lithium battery capacity diving identification

[0115] Step 1.1: Data Preprocessing

[0116] The diving identification and labeling based on the characteristic included angle and th...

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 a rapid lithium battery capacity degradation early warning method. The method comprises the following steps: obtaining a lithium battery degradation curve of a lithium batterycharge-discharge cycle after data preprocessing, the lithium battery degradation curve comprising a starting point Q1 and an ending point Q2; determining a characteristic included angle of the lithiumbattery degradation curve according to the bending degree of the lithium battery degradation curve; comparing the characteristic included angle of the lithium battery degradation curve with a characteristic included angle alarm threshold value and a characteristic included angle diving threshold value; determining whether rapid lithium battery capacity degradation occurs or not according to a comparison result; and triggering rapid lithium battery capacity degradation alarm when determining that the rapid lithium battery capacity degradation has occurred.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery capacity diving warning method. Background technique [0002] Lithium-ion batteries are currently the main energy storage devices widely used in military electronic products, avionics devices, electric vehicles and various portable electronic devices (such as laptops, digital cameras, tablet computers, mobile phones, etc.), due to their light weight, discharge With the characteristics of low efficiency and long life, lithium-ion batteries have basically replaced nickel-cadmium batteries and nickel-metal hydride batteries. At the same time, due to the current concern about climate change and the urgency of new energy development, lithium-ion electric vehicles have developed rapidly. Many automobile manufacturers and research institutions are committed to developing new energy vehicles that can replace traditional petroleum, such as Germany Automobile c...

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): G01R31/392G01R31/367
CPCG01R31/367G01R31/392
Inventor 马剑马梁宋登巍郝杰丁宇吕琛
Owner BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com