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Positive and negative tab binder, preparation method thereof and manufacturing method of pole piece

A technology of adhesive preparation and production method, which is applied in the direction of adhesive, adhesive type, cellulose adhesive, etc., can solve the problems of limited energy density, waste of space, and poor welding, so as to improve energy density and connect Firmness and the effect of improving production efficiency

Inactive Publication Date: 2021-03-02
CHONGQING VDL ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium batteries are composed of positive and negative electrodes, diaphragm, electrolyte and casing. The positive and negative electrodes are one of the core components. figure 1 As shown, in the existing process of making the positive electrode sheet 2 of the pouch battery, the welding method is mainly used at present, that is, the positive electrode tab 1 and the positive electrode sheet 2 are stacked together, and the positive electrode tab 1 and the positive electrode sheet 2 are stacked together. The two are combined to form a structure with solder joints 9, but this is prone to the problem of welding through or weak welding. At the same time, during the coating process, it is necessary to reserve the positive electrode ear position 10 without coating. For welding the positive tab 1 in the subsequent process, in order to stabilize the welding process, the width of the positive tab 10 is reserved larger than the width of the positive tab 1, which wastes a certain amount of space and limits the increase in energy density. Similarly, the negative tab 5 also has the above problems

Method used

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  • Positive and negative tab binder, preparation method thereof and manufacturing method of pole piece
  • Positive and negative tab binder, preparation method thereof and manufacturing method of pole piece
  • Positive and negative tab binder, preparation method thereof and manufacturing method of pole piece

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1 of the present invention provides a method for preparing positive and negative tab binders. The preparation method for positive tab binders includes the following steps:

[0030] Step S1, the preparation of the positive tab binder, the conductive carbon black, polyvinylidene fluoride (PVDF) and N-methylpyrrolidone (NMP) in a ratio of 1:9:90, under the condition of humidity ≤ 30%, Control the temperature between 30-40°C, stir with a stirring device with a linear speed of 5-8m / min for 1.5-2.5h to form a uniformly dispersed slurry, and let it stand for 3.5-4.5h after stirring to form a positive tab binder ;

[0031] The preparation method of the negative tab binder comprises the steps of:

[0032] Step S2, the preparation of negative electrode tab binder, mix conductive carbon black, sodium carboxymethyl cellulose and water at a ratio of 1:5:95, control the temperature between 30-40°C, and use a line speed of 5-8m / min mixing equipment for 1.5-2.5h to form a...

Embodiment 2

[0034] Embodiment 2 of the present invention provides a positive and negative tab binder. The positive tab binder is prepared by the method for preparing the positive tab binder described in Example 1. The negative tab binder is prepared using The preparation method of the negative tab binder described in Example 1 is prepared. The positive tab binder and the negative tab binder prepared in the present invention have excellent electrical conductivity and bonding performance, and are firmly connected.

Embodiment 3

[0036] In the third embodiment, if figure 2 As shown, a layer of the above-mentioned positive tab adhesive is coated on the first overlapping bonding portion 3 of the positive electrode sheet 2 , so that the positive electrode tab 1 can be directly bonded to the positive electrode sheet 2 .

[0037] In the third embodiment, if image 3 As shown, a layer of the above-mentioned negative tab adhesive is coated on the second overlapping bonding portion 6 of the negative electrode sheet 5 , so that the negative electrode tab 4 can be directly bonded to the negative electrode sheet 5 .

[0038] Please refer to Figure 2 to Figure 4 , Embodiment 3 of the present invention provides a method for manufacturing positive and negative electrodes, the method includes the following steps:

[0039] Step S10, coating the first overlapping bonding portion 3 of the positive tab 1 and the positive sheet 2 with a layer of the positive tab adhesive according to claim 2;

[0040] Step S20, bondi...

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Abstract

The invention discloses a positive and negative tab binder, a preparation method thereof and a manufacturing method of a pole piece. The preparation method comprises the following steps of firstly, preparing a positive tab binder through a positive tab binder preparation method, secondly, preparing a negative tab binder through a negative tab binder preparation method, thirdly, coating the first overlapped binding part of the positive tab and the positive plate with a layer of positive tab binder, and binding the positive tab coated with the positive tab binder on the first overlapped bindingpart of the positive plate, and finally, coating the second overlapped binding part of the negative tab and the negative plate with a layer of the prepared negative tab binder, and binding the negative tab coated with the negative tab binder to the second overlapped binding part of the negative plate. A tab welding position does not need to be reserved in the case of coating, the tabs are connected with the pole piece current collector in a binding manner, so that the internal space is fully utilized, the energy density is improved, the production efficiency is improved, and the potential safety hazard is reduced.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a positive and negative tab binder, a preparation method thereof, and a method for manufacturing pole pieces. Background technique [0002] Since the 1990s, the research and production of lithium-ion batteries have made significant progress, and their applications in various fields have become more and more extensive. Polymer lithium-ion batteries are favored by more and more fields due to their high safety and shape customization. With the explosive growth of wireless earphones, electronic cigarettes and other industries, the supply of mini polymer batteries is in short supply. With the rapid growth of miniature consumer electronic products represented by wireless earphones, higher requirements are placed on the energy density of lithium batteries. [0003] Lithium batteries are composed of positive and negative electrodes, diaphragm, electrolyte and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J127/16C09J11/04C09J101/28H01M50/531H01M50/528H01M4/139H01M10/0525
CPCC08K2201/001C09J11/04C09J101/286C09J127/16H01M4/139H01M10/0525C08K3/04Y02E60/10
Inventor 吕新坡
Owner CHONGQING VDL ELECTRONICS