Preparation method of high water, oxygen and high temperature-resistant cell

A technology of high temperature resistance and water resistance, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, circuits, etc., to achieve the effect of improving service life and safety performance, reducing control requirements, and reducing manufacturing costs

Active Publication Date: 2019-07-23
合肥国轩精密涂布材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as we all know, NCM (especially the high-nickel system) is not as safe as LFP. Therefore, it is necessary to improve the high temperature resistance of the battery cell to improve its safety performance during the manufacture and application of the NCM system lithium-ion power battery.

Method used

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  • Preparation method of high water, oxygen and high temperature-resistant cell
  • Preparation method of high water, oxygen and high temperature-resistant cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Preparation of Al by Coating and Adhesive Method 2 o 3 / PET / CPP insulation film

[0029] (1) Apply glue evenly on the surface of the PET film with a gravure coater to realize the adhesion between the CPP film and the PET film to make a PET / CPP film, wherein the thickness of the CPP film is 60 μm, and the thickness of the PET film is 10 μm;

[0030] (2) Al 2 o 3 Powder, styrene-butadiene rubber binder, and water are mixed according to the mass percentage of 49:0.5:50, and then a uniform and stable Al 2 o 3 slurry, using a gravure coater to coat Al 2 o 3 The slurry is uniformly coated on the surface of the PET layer of the PET / CPP film, Al 2 o 3 The thickness of the coating is 3 μm, and the water-blocking, oxygen-blocking and high-temperature resistant Al 2 o 3 / PET / CPP insulation film.

Embodiment 2

[0031] Example 2 Preparation of Al by Melt Extrusion and Thermal Bonding 2 o 3 / PET / CPP insulation film

[0032] (1) Use hot extrusion equipment to melt CPP particles at a high temperature of 180°C, and process them into a film with a thickness of 70 μm through an extrusion touch head. The extrusion width of the CPP film is the same as that of the PET film; the extruded CPP film and the PET film The compounding of the two is realized by a heat recovery machine, the thickness of the PET film is 20 μm, and the heat recovery temperature is controlled at 150 ° C to prepare a PET / CPP film;

[0033] (2) Al 2 o3 Powder, polyacrylic acid binder, and water are mixed according to the mass percentage of 49:0.5:50, and then a uniform and stable Al is prepared by a high-speed disperser 2 o 3 slurry, using a gravure coater to coat Al 2 o 3 The slurry is uniformly coated on the surface of the PET layer of the PET / CPP film, Al 2 o 3 The thickness of the coating is 2 μm, and Al is prep...

Embodiment 3

[0034] Example 3 Preparation of high-resistance water-resistance oxygen-resistance high-temperature resistant electric core

[0035] (1) Coat the viscous slurry containing the positive active material on the aluminum foil and dry it, and make a laser sheet to make the positive pole piece, and use the aluminum foil as the positive tab; coat the viscous slurry containing the negative active material on the copper Foil, drying, and laser production to make negative pole pieces, using copper foil as negative pole lugs; making positive pole pieces, diaphragms, and negative pole pieces into roll core 1 by lamination; figure 1 As shown, the single positive pole lug and negative pole lug in the winding core are ultrasonically welded on the positive pole connecting piece 11 and the negative pole connecting piece 12 respectively, and the surfaces of the positive pole connecting piece 11 and the negative pole connecting piece 12 are coated with PP glue 3 The distance between the coating ...

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Abstract

The invention discloses a preparation method of a high water, oxygen and high temperature-resistant cell, and belongs to the field of preparation of lithium ion batteries. The surface of the cell is coated with an Al2O3 / PET / CPP insulating film composed of Al2O3, PET and CPP, and the insulating film can effectively resist water, oxygen and high temperature. The coating function of the Al2O3 / PET / CPPinsulating film makes that the prepared roll core reduces the control requirements on the ambient humidity in the post-charging and activation process after the heat sealing is completed, carried outunder normal temperature and humidity conditions, which greatly reduces the energy consumption during the cell preparation process and reduces the manufacturing cost of the power battery. Moreover, since the outer layer of the Al2O3 / PET / CPP insulating film is an Al2O3 layer having good performance of high temperature resistance, so that the prepared cell can still work normally at a high temperature, thereby improving the service life and safety performance of the power battery.

Description

technical field [0001] The invention belongs to the field of lithium ion battery preparation, and in particular relates to a preparation method of a high-resistance water-resistance oxygen-resistance high-temperature resistance electric core. Background technique [0002] With the rapid development of the field of new energy vehicles, lithium-ion power batteries have also been developed by leaps and bounds. We know that the main raw materials used in lithium-ion batteries, such as positive electrode LFP / NCM, electrolyte, etc., are extremely sensitive to moisture. Therefore, the requirements for environmental humidity control in the production and manufacturing of lithium-ion power batteries are particularly high, and the entire process of battery manufacturing is at low temperature. Carried out under humidity conditions (RH≤40%). Especially starting from the injection of the electrolyte into the cell, in order to ensure the performance of the battery, all processes starting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/02H01M50/116H01M50/124
CPCH01M10/058H01M50/116H01M50/124H01M50/1245Y02E60/10Y02P70/50
Inventor 陈萍李瑜陈兵张江伟
Owner 合肥国轩精密涂布材料有限责任公司
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