Lithium ion battery positive pole piece and gap coating method thereof

A technology of lithium ion battery and positive pole piece, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode manufacturing, etc., can solve problems such as pole fragmentation, improve thickness uniformity, improve cold-pressed stripping, and reduce stress cumulative effect

Pending Publication Date: 2022-04-05
BATTERO TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional lithium-ion battery positive pole piece is made by continuous coating. After coating, the stress on the pole piece can only be released to the two edges of the slurry coating when it is rolled. When the stress reaches a certain level, it will cause the pole piece to be broken

Method used

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  • Lithium ion battery positive pole piece and gap coating method thereof
  • Lithium ion battery positive pole piece and gap coating method thereof
  • Lithium ion battery positive pole piece and gap coating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for gap coating of the positive electrode sheet of a lithium ion battery. First, the positive electrode slurry is coated on the surface A of the aluminum foil 1 according to the normal coating process, and the ceramic slurry is continuously coated, and then dried and wound after coating. , to form a single-sided pole piece; then take the above-mentioned single-sided pole piece to the coating machine head, perform gap coating on the B side, and then dry to obtain the positive pole piece.

[0033] Specifically, the positive electrode slurry coating gap L on the aluminum foil 1 3 40mm~60mm, the ceramic slurry is continuously coated on the edge of the positive electrode slurry, the coating position of the first segment of the positive electrode slurry on the A side is aligned with the coating position of the first segment of the B side, and the coating position of the tail segment of the positive electrode slurry on the A side is aligned with the coating position of...

Embodiment 2

[0035] A method for coating gaps between positive pole pieces of a lithium-ion battery, the specific steps of which are as follows:

[0036] S1: Gap coating 1: Put the empty aluminum foil 1 at the coating head, the die head of the coating machine uses positive electrode slurry and ceramic slurry, firstly coat the A side of the aluminum foil 1, and the positive electrode slurry when coating Gap coating according to the process, ceramic slurry for continuous coating;

[0037] S2: pole piece drying 1: Put the pole piece coated on side A into the oven for drying, and take it back to the coating head for standby after winding;

[0038] S3: Gap coating 2: The die head of the coating machine continues to use the positive electrode slurry and the ceramic slurry to coat the electrode piece on the A side after coating and drying on the B side, and the positive electrode slurry is gap coated according to the process during coating Dislocation between cloth and surface A, continuous coat...

Embodiment 3

[0041] A lithium-ion battery positive pole piece, prepared according to the method described in Example 2, with a structure such as figure 1 As shown, it includes an aluminum foil 1 and a positive electrode slurry layer 2 and a ceramic layer 3 coated on the aluminum foil 1, wherein a plurality of positive electrode slurry layers 2 are distributed on the aluminum foil 1 at intervals to form a matrix structure, along the length direction of the pole piece On, the gap L between two adjacent positive electrode slurry layers 2 3 is 50mm, along the pole piece width direction, the gap D between two adjacent positive electrode slurry layers 2 4 45mm, the aluminum foil 1 in the gap is exposed, and the ceramic layer 3 is coated on the aluminum foil 1 in the gap between the adjacent positive electrode slurry layers 2. Four ceramic layers 3 are arranged in parallel and at intervals along the width direction of the pole piece. Each ceramic layer 3 width D 3 It is 10mm, and it is in conta...

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Abstract

The invention relates to a lithium ion battery positive pole piece and a gap coating method thereof.The positive pole piece comprises an aluminum foil (1), a positive slurry layer (2) and ceramic layers (3), the positive slurry layer (2) and the ceramic layers (3) are arranged on the aluminum foil (1), and the ceramic layers (3) are continuously distributed in the length direction of the pole piece and distributed at intervals in the width direction of the pole piece; the positive slurry layers (2) are distributed at intervals along the length direction and the width direction of the pole piece, and the ceramic layers (3) are connected with the positive slurry layers (2). Compared with the prior art, the problem of stress accumulation effect in the coating process can be effectively solved, and the problem of cold pressing strip breakage is improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery manufacturing, in particular to a lithium-ion battery positive pole piece and a gap coating method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high average output voltage, small self-discharge, no memory effect, and long cycle life, and are widely used in electronic equipment, energy storage devices, and new energy vehicles. With the advancement of society and technology, the performance requirements for lithium-ion batteries are also getting higher and higher, which also requires higher and higher manufacturing technology for batteries. [0003] The traditional lithium-ion battery positive pole piece is made by continuous coating. After coating, the stress on the pole piece during rolling can only be released to the two edges of the slurry coating. When the stress reaches a certain level, the pole piece will be broken. With the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M10/0525
CPCY02E60/10
Inventor 江德顺樊文龙张五堂肖礼军
Owner BATTERO TECH CORP LTD
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