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

Method for detecting lithium ion battery pack

A technology of lithium-ion battery pack and detection method, which is applied in the direction of measuring electricity, measuring device, measuring electrical variables, etc., can solve the problems of immature batteries, etc., and achieve the effects of improving operation safety, improving stability and prolonging service life.

Inactive Publication Date: 2019-01-15
青岛恒金源电子科技有限公司
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of electric vehicles, the technology of power battery packs is also widely used, and higher requirements are put forward for the safety of batteries, and the safety of batteries mainly refers to the prevention of thermal runaway of batteries. The technology for judging thermal runaway of batteries is still immature

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 lithium ion battery pack
  • Method for detecting lithium ion battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Provide a set of lithium-ion batteries to be formed, pulse charge the battery with a current of 0.05C until the charging cut-off voltage stops; the pulse time is 10min, the interval time is 120s, and the charging cut-off voltage is 4.35V;

[0031] 2) Discharging the battery with a current of 0.2C to the discharge cut-off voltage, the discharge cut-off voltage is 2.8V;

[0032] 3), repeat steps 1-2 3 times;

[0033] 4), static aging for 5 days;

[0034] 5) Pull out the electrolyte solution that is not immersed in the electrodes in the battery case, re-inject new electrolyte solution, and seal it. The new electrolyte solution includes 1.2mol / L lithium hexafluorophosphate and carbonic acid with a volume ratio of 1:2:1 Dimethyl ester, ethyl carbonate, a non-aqueous solvent composed of ethyl methyl carbonate, and 5% by volume of fluorovinylene carbonate;

[0035] 6) Charge the battery with a current of 5C to a cut-off voltage of 4.35V, and then discharge the battery wit...

Embodiment 2

[0041] 1) Provide a set of lithium-ion batteries to be formed, pulse charge the battery with a current of 0.02C until the charging cut-off voltage stops; the pulse time is 0.1min, the interval time is 30s, and the charging cut-off voltage is 4.2V;

[0042] 2), discharge the battery with a current of 0.05C to the discharge cut-off voltage, and the discharge cut-off voltage is 2.7V;

[0043] 3), repeat steps 1-2 0 times;

[0044] 4), static aging for 1 day;

[0045] 5) Pull out the electrolyte solution that is not immersed in the electrodes in the battery case, re-inject new electrolyte solution, and seal it. The new electrolyte solution includes 1.2mol / L lithium hexafluorophosphate and carbonic acid with a volume ratio of 1:2:1 Dimethyl ester, ethyl carbonate, a non-aqueous solvent composed of ethyl methyl carbonate, and 5% by volume of fluorovinylene carbonate;

[0046] 6) Charge the battery with a current of 1C until the charging cut-off voltage is 4.2V, and then discharge ...

Embodiment 3

[0052] 1) Provide a set of lithium-ion batteries to be formed, pulse charge the battery with a current of 0.03C until the charging cut-off voltage stops; the pulse time is 2min, the interval time is 40s, and the charging cut-off voltage is 4.3V;

[0053] 2) Discharging the battery with a current of 0.1C to the discharge cut-off voltage, the discharge cut-off voltage is 2.75V;

[0054] 3), repeat steps 1-2 twice;

[0055] 4), static aging for 3 days;

[0056] 5) Pull out the electrolyte solution that is not immersed in the electrodes in the battery case, re-inject new electrolyte solution, and seal it. The new electrolyte solution includes 1.2mol / L lithium hexafluorophosphate and carbonic acid with a volume ratio of 1:2:1 Dimethyl ester, ethyl carbonate, a non-aqueous solvent composed of ethyl methyl carbonate, and 5% by volume of fluorovinylene carbonate;

[0057] 6) Charge the battery with a current of 3C until the charging cut-off voltage is 4.25V, and then discharge the b...

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 a lithium ion battery pack. The method comprises the following steps: checking the temperature of a single battery to determine whether the single batteryis isolated from the battery pack for detection, and for the isolated battery under detection, detecting the cooling rate of the battery, and determining whether to replace the battery by comparing the detected cooling rate of the battery with a standard values pre-stored in the database. The detection method provided by the invention can detect the degree of self-discharge of the battery and thepossibility of occurrence of thermal runaway, accurately find out before the thermal runaway of the battery, isolate the battery in a dangerous state and replace the battery pack, thereby improving the operational security of the battery pack.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a detection method for a lithium-ion battery pack. Background technique [0002] Lithium-ion batteries have become the preferred power source for electric vehicles due to their high energy density, high power density, long cycle life, and good safety. With the development of electric vehicles, the technology of power battery packs is also widely used, and higher requirements are put forward for the safety of batteries, and the safety of batteries mainly refers to the prevention of thermal runaway of batteries. The technology for judging the thermal runaway of the battery is still immature. The inventor found that by measuring the cooling rate of the battery and comparing it with the standard cooling rate of the battery pre-stored in the database, the degree of self-discharge of the internal micro-short circuit of the battery to be tested can be judged, thereby accurately evalu...

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): G01R31/385G01R31/396
Inventor 不公告发明人
Owner 青岛恒金源电子科技有限公司
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