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Lithium ion battery electrode preparation process and intaglio printing equipment

A lithium-ion battery and a preparation process technology are applied in the field of lithium-ion battery electrode preparation technology and gravure printing equipment, and can solve problems such as easy precipitation of lithium, increase areal density, improve production efficiency and service life, and avoid pole piece deformation. Effect

Pending Publication Date: 2022-02-11
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that lithium is easily deposited on the upper edge of the negative electrode of the lithium ion battery in the prior art, thereby providing a lithium ion battery electrode preparation process and gravure printing equipment

Method used

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  • Lithium ion battery electrode preparation process and intaglio printing equipment
  • Lithium ion battery electrode preparation process and intaglio printing equipment
  • Lithium ion battery electrode preparation process and intaglio printing equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0039] refer to figure 1 and image 3 In the lithium-ion battery electrode preparation process provided in this embodiment, after the coating is completed and dried, the negative electrode slurry layer is printed or sprayed on the negative electrode thinning area 51, and the thickness of the negative electrode slurry layer is less than 15 μm, preferably 4-5 μm , specifically 4 μm or 4.5 μm or 5 μm. The negative electrode slurry layer can be a common solid layered structure, or a hollowed-out layered structure.

[0040] In the lithium-ion battery electrode preparation process of this embodiment, after the drying is completed, the negative electrode slurry layer is printed or sprayed on the negative electrode thinned area 51, which can increase the area density of this area and increase the NP ratio, thereby improving the problem of lithium deposition in the negative electrode.

[0041] As a preferred solution of the above technical solution, the printing adopts gravure printi...

Embodiment 2

[0051] refer to figure 2and image 3 , the gravure printing equipment provided in this embodiment includes a printing plate cylinder 1 and an embossing cylinder 2 .

[0052] The printing plate cylinder 1 has a plurality of grooves evenly distributed along the circumferential direction on the circumferential surface of part of the shaft section to form a scoring area 11; the circumferential surface of the remaining part of the shaft section is a smooth surface, which is used to remove the thinning area of ​​the pressing pole piece other parts of. The shape of the grooves is not limited, and can be strip grooves, circular grooves, triangular grooves or other common groove shapes. No matter what groove shape is used, as long as it is evenly distributed, it will increase the surface density of the negative electrode thinned region 51 . Preferably, the groove is a strip-shaped groove, and the length direction of the strip-shaped groove is parallel to the axial direction of the p...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrode preparation process and gravure printing equipment. According to the lithium ion battery electrode preparation technology, after coating and drying are completed, a negative electrode slurry layer is printed or sprayed on a negative electrode thinned area, and the thickness of the negative electrode slurry layer is smaller than 15 microns. The intaglio printing equipment comprises a printing plate roller, and a plurality of grooves are evenly distributed in the circumferential face of part of the shaft section of the printing plate roller in the circumferential direction to form a nick area. And the impressing roller is axially parallel to the forme roller and axially corresponding to the forme roller, and the impressing roller is suitable for being connected with the forme roller to complete printing. According to the lithium ion battery electrode preparation process provided by the invention, the thickness difference between the thinned areas of the positive electrode and the negative electrode can be filled, the surface density of the thinned areas of the negative electrode is increased, the NP ratio of the thinned areas is improved, and the problem of cyclic lithium precipitation caused by thinning can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrode preparation process and gravure printing equipment. Background technique [0002] With the aggravation of environmental pollution, people's demand for clean energy such as electric energy is becoming stronger and stronger. As a good carrier of electric energy, lithium-ion batteries have been widely used. Lithium-ion battery electrode preparation generally includes processes such as slurry preparation, coating, drying, and rolling. Among them, the coating is to stir the material evenly, and then coat the surface of the copper / aluminum foil to form an active material layer; the roll pressing is to carry out the roller compaction on the coated and dried pole piece. [0003] During coating, due to the existence of surface tension, the slurry will gather towards the edge, so that the thickness of the slurry at the edge is greater than the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139B41F9/00B41F9/06B41F9/10B41M1/10B41M1/26
CPCH01M4/0402H01M4/0404H01M4/0435H01M4/0419H01M4/139B41M1/10B41M1/26B41F9/00B41F9/061B41F9/10Y02E60/10
Inventor 胡朝帅王茂范胡伟东徐亚杰袁园
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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