A temperature-controlled and pressure-controlled formation method of a lithium-ion battery

A lithium-ion battery and a technology of a chemical formation method, which are applied in the field of power batteries, can solve the problems of electrolyte loss, cost increase, environmental pollution, etc., and achieve the effects of reducing ambient air pressure, improving film-forming quality, and slowing exhaust speed.

Active Publication Date: 2020-05-29
星恒电源(滁州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries will go through the formation process after liquid injection, and in order to discharge the gas generated during the formation, the open formation is generally used, and in the open formation, because the gas production rate is difficult to control, the electrolyte will change with time during the formation process. As the gas gushes out from the liquid injection hole, it pollutes the environment of the formation, and also causes the loss of the electrolyte. Most of the electrolyte is partially toxic, which is harmful to the health of the staff. At the same time, due to the high activity of the battery electrodes in the existing lithium-ion batteries, the electrolyte is easy to decompose and generate gas in a high-temperature environment, thereby affecting the high-temperature cycle life of the battery

Method used

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  • A temperature-controlled and pressure-controlled formation method of a lithium-ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1), place the lithium-ion battery injected with the electrolyte in a sealed formation device, vacuumize, adjust the air pressure in the sealed formation device to 0.04MPa, and let it stand for 0.3h; Adjust the air pressure in the sealed chemical formation device to 0.001MPa, and let it stand for 0.3h; the electrolyte includes a non-aqueous solvent, 0.6M LiPF 6 , and the LiBOB of 0.4M; And the mass fraction is the vinyl sulfite of 2% and the biphenyl of 1%; Described non-aqueous solvent is the ethyl carbonate of 65 volume % and the dimethyl carbonate of 35 volume %;

[0039] 2) Lowering the temperature inside the chemical conversion device to 8°C, while feeding nitrogen containing carbon dioxide, the volume fraction of the carbon dioxide is 5%, and adjusting the air pressure in the chemical conversion device to 0.1 MPa;

[0040] 3), using a current of 0.01C to adjust the voltage of the lithium-ion battery to a first voltage, the first voltage is 2.65V; stand still for 0....

Embodiment 2

[0056] 1), place the lithium-ion battery injected with the electrolyte in a sealed formation device, vacuumize, adjust the air pressure in the sealed formation device to 0.06MPa, and let it stand for 1h; continue to vacuumize, vacuumize the described The air pressure in the sealed chemical conversion device is adjusted to 0.01MPa, and it is left to stand for 1h; the electrolyte includes a non-aqueous solvent, 0.8M LiPF 6 , and the LiBOB of 0.6M; And the mass fraction is the vinyl sulfite of 4% and the biphenyl of 2%; Described non-aqueous solvent is the ethyl carbonate of 65 volume % and the dimethyl carbonate of 35 volume %;

[0057] 2) Lower the temperature inside the chemical conversion device to 12°C, and at the same time feed nitrogen containing carbon dioxide, the volume fraction of the carbon dioxide is 8%, and adjust the air pressure in the chemical conversion device to 0.1 MPa;

[0058] 3), using a current of 0.02C to adjust the voltage of the lithium-ion battery to t...

Embodiment 3

[0074] 1), place the lithium-ion battery injected with the electrolyte in a sealed formation device, vacuumize, adjust the air pressure in the sealed formation device to 0.05MPa, and let it stand for 0.5h; The air pressure in the sealed chemical formation device is adjusted to 0.005MPa, and left to stand for 0.5h; the electrolyte includes a non-aqueous solvent, 0.7M LiPF 6 , and the LiBOB of 0.5M; And the mass fraction is the vinyl sulfite of 3% and the biphenyl of 2%; The non-aqueous solvent is the ethyl carbonate of 65 volume % and the dimethyl carbonate of 35 volume %;

[0075] 2) Lower the temperature in the chemical conversion device to 10°C, and at the same time feed nitrogen containing carbon dioxide, the volume fraction of the carbon dioxide is 6%, and adjust the air pressure in the chemical conversion device to 0.1 MPa;

[0076] 3), using a current of 0.01C to adjust the voltage of the lithium-ion battery to a first voltage, the first voltage is 2.7V; stand still for ...

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Abstract

The invention provides a temperature-controlled and pressure-controlled formation method of a lithium-ion battery, which includes injecting liquid and forming the assembled battery under controlled temperature and pressure. The temperature-controlled and pressure-controlled formation method includes low-pressure formation and normal temperature formation. As well as multi-stage formation processes such as high-temperature formation, the lithium-ion battery obtained through the method has good cycle life and high-temperature stability.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a temperature-controlled and pressure-controlled formation method of a lithium-ion battery. Background technique [0002] Lithium-ion batteries will go through the formation process after liquid injection, and in order to discharge the gas generated during the formation, the open formation is generally used, and in the open formation, because the gas production rate is difficult to control, the electrolyte will change with time during the formation process. As the gas gushes out from the liquid injection hole, it pollutes the environment of the formation, and also causes the loss of the electrolyte. Most of the electrolyte is partially toxic, which is harmful to the health of the staff. At the same time, due to the high activity of the battery electrodes in the existing lithium-ion batteries, the electrolyte is easy to decompose and generate gas in a high-temperature envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 盛蕾
Owner 星恒电源(滁州)有限公司
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