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Surface coating device and method for lithium battery pole piece or diaphragm

A surface coating, lithium battery technology, applied in the device, battery electrode, coating and other directions of coating liquid on the surface, can solve the problem of inability to accurately coat the substrate material, achieve good filtration adsorption performance, high stability, The effect of convenient coating operation

Inactive Publication Date: 2015-01-14
WANXIANG 123 CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a surface coating device for lithium battery pole pieces or separators in order to solve the defect that the existing coating device cannot accurately coat the base material below 10μ

Method used

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  • Surface coating device and method for lithium battery pole piece or diaphragm
  • Surface coating device and method for lithium battery pole piece or diaphragm
  • Surface coating device and method for lithium battery pole piece or diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A surface coating method for a lithium battery pole piece or separator, the surface coating method comprising the following steps:

[0037] a) Preparation of slurry: Dissolve the binder polyvinylidene fluoride in the solvent N-methylpyrrolidone to make glue, the glue has a solid content of 1%, and the viscosity is 600mPa·s. Aluminum oxide, the mass ratio of aluminum oxide to binder polyvinylidene fluoride is 1:20, the solid content of the ceramic slurry is 20.8%, the fineness is 8um, and the viscosity is 1250mPa·s, so that the aluminum oxide Aluminum is evenly dispersed in the glue solution, and then vacuumized to remove air bubbles for 1 hour to prepare a slurry;

[0038] b) Surface coating: set the pole piece roll or diaphragm roll to be coated on the coating device, the slurry prepared in step a) reaches the coating head through the feeding mechanism, and the coating head is close to the coating to be coated The material and the slurry are attached to the gravure ro...

Embodiment 2

[0040] A surface coating method for a lithium battery pole piece or separator, the surface coating method comprising the following steps:

[0041]a) Preparation of slurry: dissolve the binder polyvinylidene fluoride and polytetrafluoroethylene in the solvent N-methylpyrrolidone to make a glue solution, and the mass ratio of polytetrafluoroethylene to polyvinylidene fluoride is 1 : 3, the solid content of the glue is 2%, and the viscosity is 1000mPa s, adding aluminum oxide, aluminum phosphate and silicon dioxide in the glue, the mass ratio of aluminum oxide, aluminum phosphate, silicon dioxide is 1 : 1.7: 2.5, the solid content of the ceramic slurry is 65%, the fineness is 10um, and the viscosity is 2000mPa·s, so that the aluminum oxide, aluminum phosphate and silicon dioxide are evenly dispersed in the glue, and then vacuumed to remove air bubbles 1.5h, make the slurry;

[0042] b) Surface coating: set the pole piece roll or diaphragm roll to be coated on the coating device,...

Embodiment 3

[0044] A surface coating method for a lithium battery pole piece or diaphragm, the surface coating method comprising the following steps:

[0045] a) Preparation of slurry: dissolve the binder polytetrafluoroethylene in the solvent N-methylpyrrolidone to make glue, the solid content of the glue is 0.5%, the viscosity is 500mPa·s, and trioxide is added to the glue Aluminum, aluminum phosphate and silicon dioxide, the mass ratio of aluminum oxide, aluminum phosphate and silicon dioxide is 1: 1.2: 2.2, the solid content of the ceramic slurry is 10%, the fineness is 2um, and the viscosity is 600mPa· s, make aluminum oxide, aluminum phosphate, and silicon dioxide evenly dispersed in the glue solution, and then vacuumize to remove air bubbles for 2 hours to prepare a slurry;

[0046] b) Surface coating: set the pole piece roll or diaphragm roll to be coated on the coating device, the slurry prepared in step a) reaches the coating head through the feeding mechanism, and the coating h...

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Abstract

The invention relates to a surface coating device and method for a lithium battery pole piece or diaphragm; a coating head is provided with an upper scraper which can be vertically and finely tuned, a lower scraper, an intaglio roller, a slurry cavity and a baffle plate for sealing the cavity; the upper scraper and the lower scraper are respectively positioned on the upper part and the lower part of the intaglio roller; the surface of an intaglio roller body is marked with regular patterns; the coating method comprises two steps: slurry preparation and surface coating. A ceramic slurry has the advantages of chemical corrosion resistance, high temperature resistance, good filtration and adsorption performance and higher stability, can prevent generation of diaphragm contraction due to heat emitting of a battery, and also can prevent a fire outbreak problem caused by crystal structure shifting and collapse due to unstable anode materials; and the influence of the cavity pressure fluctuation on the coating thickness can be avoided, the coating operation on an ultra-thin substrate material is facilitated, and the coating accuracy is ensured.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a surface coating device and method for lithium battery pole pieces or diaphragms that improve the safety performance of lithium batteries. [0002] Background technique [0003] In the battery industry, lithium batteries have received more and more attention and attention due to their advantages such as high energy density, high voltage, wide operating temperature range, and long life. Over the past decade, lithium batteries have dominated the non-rechargeable and rechargeable battery markets and are widely used in portable electronic devices such as mobile phones, notebook computers, and digital cameras. [0004] However, during the application of lithium-ion batteries, the main three reasons for battery fire safety accidents are: 1. Due to the shrinkage of the diaphragm caused by the heating of the battery, the contact between the positive and negative electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C1/08B05C11/04B05D1/28H01M4/139H01M2/14C04B35/634
CPCY02E60/10
Inventor 张兴国郑丁韩春
Owner WANXIANG 123 CO LTD
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