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A kind of lithium ion battery pole piece and preparation method thereof

A technology for lithium-ion batteries and pole pieces, applied in battery electrodes, electrode manufacturing, non-aqueous electrolyte storage battery electrodes, etc., can solve the problems of broken belts, height differences, and brittle foils, etc., and save preparation steps, The effect of reducing production cost and improving production efficiency

Active Publication Date: 2019-03-05
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are following problems in using conventional structural adhesive paper: as Figure 1~3 As shown, since the coating of the active material layer 3 belongs to quantitative coating, the structural adhesive paper 2 will occupy part of the space of the active material layer 3, resulting in the formation of a bulge on the active material layer 3 at the edge of the structural adhesive paper 2, have a certain height difference
When the structural adhesive paper 2 is heated and curled and peeled off, the bulge at the peeled edge cannot be eliminated. In the subsequent rolling process, the current collector 1 at the bulge will be subjected to excessive shear force, causing the foil to become brittle, and even appear Fracture, resulting in the process can not be carried out normally
In addition, the thickness of the active material layer 3 at the peeled edge of the conventional structural tape 2 is larger than that of the normal area, which makes it easier to break the tape during the subsequent rolling process

Method used

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  • A kind of lithium ion battery pole piece and preparation method thereof
  • A kind of lithium ion battery pole piece and preparation method thereof
  • A kind of lithium ion battery pole piece and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0061] The preparation method of this heat-shrinkable glue is:

[0062] (1) Prepare foaming adhesive: mix glue, foaming agent and curing agent in proportion and stir;

[0063] (2) The foaming adhesive is coated on the heat-shrinkable substrate, which can be coated with a scraper, and dried after coating; the drying time is 1-3 minutes, and the oven temperature is <85°C;

[0064] (3) Curing (crosslinking by curing agent); temperature is 40-50°C, time >48h; too high temperature will affect the performance of foaming agent, too low temperature will not cure completely; too short curing time will not cure completely;

[0065] (4) Slitting and shipping.

[0066] The invention also relates to the application of the heat-shrinkable glue in preparing lithium-ion battery pole pieces, and the battery pole pieces include positive pole pieces and negative pole pieces.

[0067] The present application also relates to a foam glue 6 used in the above preparation process, which is composed ...

Embodiment 1

[0074] The preparation of embodiment 1 heat-shrinkable glue

[0075] 1. Prepare foaming adhesive: mix acrylate, foaming agent and curing agent in proportion and stir;

[0076] 2. The foaming adhesive is coated on the heat-shrinkable substrate, which can be coated with a scraper, and dried after coating; the drying time is 1 to 3 minutes, and the oven temperature is <85°C;

[0077] 3. Curing (curing agent for cross-linking): the temperature is 40-50°C, and the time is >48h;

[0078] 4. Slitting and shipping. The parameters of the prepared heat shrinkable glue are shown in Table 1.

[0079] Table 1:

[0080]

Embodiment 2

[0081] Example 2 Preparation of battery pole piece

[0082] 1. Design the reserved position of the tab;

[0083] 2. Paste one-way heat-shrinkable glue on the reserved position of the tab of the current collector, and the heat-shrinkable direction of the heat-shrinkable glue is along the length direction of the current collector;

[0084] 3. Coat the active material on the surface of the current collector, heat it to 110-125°C, and the heating rate is >10°C / s; the heat-shrinkable rubber shrinks and curls and then peels off from the current collector, and the active material layer gradually dries;

[0085] 4. The mechanical brush cleans and removes the heat shrinkable rubber and the active substances coated on it;

[0086] 5. Form a reserved position for tabs for welding of tabs.

[0087] The prepared battery pole piece was prepared according to a conventional method to prepare a lithium-ion battery.

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Abstract

The invention relates to the field of a lithium ion battery, in particular relates to a lithium ion battery pole plate and a preparation method thereof. The pole plate comprises a current collector and an active substance layer, wherein the active substance layer is attached onto the surface of the current collector, a groove is formed in the active substance layer and is used for embedding a tab, the side wall of the groove is the cross section of the active substance layer, and the thickness of the cross section, at the at least one side wall, of the active substance layer is gradually reduced. The lithium ion battery pole plate is prepared from a hot shrinkage adhesive and a foamed adhesive with a certain three-dimensional shape, and the defect that the edge of a reserved position of the tab is thickened after the ordinary foamed adhesive is stripped is avoided; during the drying process of an active material, the above process is completed, thus, the installation reserved position of the tab is formed, the production efficiency can be greatly improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery pole piece and a preparation method thereof. Background technique [0002] Currently, before coating the pole piece of the lithium-ion battery, it is necessary to reserve a tab position on the current collector to ensure that the welding position of the tab is the empty foil area of ​​the current collector that is not coated with the active material layer. In the prior art, conventional structural tape is added to the reserved position of the tab before coating, and its pasting surface corresponds to an empty foil area. After the coating operation is completed, the tape is removed to reserve a position for the tab. In the coating process, the active material layer is covered on the empty foil area and adhesive paper, and then in the drying process, two temperature zones are set in the drying tunnel, wherein the former temperature zone is the active mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M4/04
CPCH01M4/0404H01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 戴志芳龙海陶兴华
Owner NINGDE AMPEREX TECH