Formation and matching method for lithium ion battery

A lithium-ion battery and battery technology, applied in secondary batteries, electrochemical generators, secondary battery charging/discharging, etc., can solve the problems of product function loss, failure to guarantee battery uniformity, explosion and fire, etc., and achieve consistent performance Good performance, long life, and the effect of improving storage life

Active Publication Date: 2017-10-24
青岛恒金源电子科技有限公司
View PDF11 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing method cannot guarantee the uniformity of the battery, which will become a hidden danger of product function loss and explosion and fire in the future

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
  • Formation and matching method for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Provide 1000 lithium-ion batteries to be formed, pulse charge the battery with a current of 0.05C, and charge the battery 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;

[0029] 2) Discharging the battery with a current of 0.2C to the discharge cut-off voltage, the discharge cut-off voltage is 2.8V;

[0030] 3), repeat steps 1-2 3 times;

[0031] 4), static aging for 5 days;

[0032] 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;

[0033] 6) Charge the battery with a current of 5C to a cut-off voltage of 4.35V, and then disch...

Embodiment 2

[0036] 1) Provide 1000 lithium-ion batteries to be formed, pulse charge the battery with a current of 0.02C, and charge 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;

[0037] 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;

[0038] 3), repeat steps 1-2 0 times;

[0039] 4), static aging for 1 day;

[0040] 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;

[0041] 6) Charge the battery with a current of 1C until the charging cut-off voltage is 4.2V, and then di...

Embodiment 3

[0044] 1) Provide 1,000 lithium-ion batteries to be formed, pulse charge the battery with a current of 0.03C, and charge 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;

[0045] 2) Discharging the battery with a current of 0.1C to the discharge cut-off voltage, the discharge cut-off voltage is 2.75V;

[0046] 3), repeat steps 1-2 twice;

[0047] 4), static aging for 3 days;

[0048] 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;

[0049] 6) Charge the battery with a current of 3C until the charging cut-off voltage is 4.25V, and then discha...

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 formation and matching method for a lithium ion battery. For forming a stable and uniform SEI film and screening out batteries with similar performances, a low-current pulse and high-current charging-discharging circulation mode is adopted; concentration polarization on the surface of an electrode is eliminated by low-current pulse charging, so as to form the stable and uniform SEI film; the active material of the electrode is activated by the high-current charging-discharging circulation so as to balance the rate capacity of the battery; by increasing current, the heating amount among different batteries can be increased; and therefore, the batteries with similar capacity and same heat dissipation can be matched into a battery pack more accurately according to the capacity and the heating amount of the batteries, thereby improving the uniformity of the battery pack.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a formation and assembly method of lithium ion batteries. Background technique [0002] With the rapid development of lithium-ion batteries, lithium-ion batteries have also begun to be widely used as power and energy storage power sources. Compared with small mobile electrical equipment such as mobile phones, power and energy storage batteries require high energy storage power output and long service life, which requires batteries to be combined in multiple parallels and multiple strings. The price of the battery pack is high and the value is high. , therefore, higher requirements are placed on battery reliability and consistency. The functional failure of any single battery in the battery pack will lead to the functional failure of the entire battery pack, and even lead to problems such as battery safety loss of control. In order to ensure the consistency of each single batt...

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): H01M10/42H01M10/44H01M10/0525
CPCH01M10/0525H01M10/4207H01M10/446Y02E60/10
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 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