Method for intermittently coating battery pole piece

A battery pole piece and coating method technology, applied to battery electrodes, devices for coating liquid on the surface, circuits, etc., can solve problems such as coating thickness deviation, U-shape, and influence on the uniformity of the pole piece, and achieve additional The effect of quantity control

Inactive Publication Date: 2011-03-16
BALEAF XIAMEN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the thickness of the pole piece produced by the current method of making the pole piece is uneven, and the thickness difference is large, so it will directly affect the quality of the battery
The existing coating methods include single-side gap coating and single-side continuous coating. Although single-side continuous coating can have less influence on the overall thickness error during coating, there will be many problems in the production process. Unfavorable, it indirectly affects the uniformity of the pole piece. With the expansion of lithium battery production and the improvement of the process, the use of coating machines has gradually increased, and the functions have also changed. In order to facilitate the production of subsequent processes, the metal foil is separated. Section coating, so at present, intermittent coating is mainly selected, so the coating amount at the beginning or end of each section of coating will change in a process, so there is also a degree of deviation or serious dislocation of coating thickness, and in When the pole piece is rolled, it will appear U-shaped or break, which will bring inconvenience to the subsequent stations

Method used

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  • Method for intermittently coating battery pole piece
  • Method for intermittently coating battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Preparation of slurry

[0017] Mix 143 grams of positive electrode active ingredient LiFePO4, 6.4 grams of conductive agent SP, 9.55 grams of binder polyvinylidene fluoride PVDF, and 262 grams of N-methylpyrrolidone, and then stir in a vacuum mixer to form a uniform positive electrode slurry.

[0018] (2) intermittent coating

[0019] according to figure 1 The process shown is intermittent coating; the specific operation steps are:

[0020] A, the slurry prepared in step (1) is carried out one-sided coating to pole piece 1 according to above-mentioned process, first coat slurry 2,

[0021] B. The intermittent distance on one side of slurry 2 is 8mm;

[0022] C. Dry the coated single-sided pole piece and pass through the coating machine head once;

[0023] D. Carry out intermittent coating on the second side of the single-sided pole piece that has passed through the empty strip, coat the slurry 3, and dry the product after coating;

[0024] The prepared product ...

Embodiment 2

[0027] Mix 143 grams of positive electrode active ingredient LiFePO4, 6.4 grams of conductive agent SP, 9.55 grams of binder polyvinylidene fluoride PVDF, and 262 grams of N-methylpyrrolidone, and then stir in a vacuum mixer to form a uniform positive electrode slurry.

[0028] (2) intermittent coating

[0029] according to figure 1 The process shown is for coating, and the specific operation steps are:

[0030] a. The slurry prepared in step (1) is coated on one side according to the above process, and the pole piece 1 is first coated with the slurry 2;

[0031] b. The intermittent distance of one side of slurry 2 is 10mm;

[0032] c. Dry the coated single-sided pole piece and pass through the coating machine head once;

[0033] D, carry out the second side intermittent coating of the single-sided pole piece that has passed the empty band, carry out the coating of slurry 3, dry and make product after coating is finished;

[0034] The prepared product was tested, and the m...

Embodiment 3

[0037] Mix 143 grams of positive electrode active ingredient LiFePO4, 6.4 grams of conductive agent SP, 9.55 grams of binder polyvinylidene fluoride PVDF, and 262 grams of N-methylpyrrolidone, and then stir in a vacuum mixer to form a uniform positive electrode slurry.

[0038] (2) intermittent coating

[0039] according to figure 1 The process shown is for coating, and the specific operation steps are:

[0040] 1) The slurry prepared in step (1) is coated on one side according to the above-mentioned process, first, the pole piece 1 is coated with the slurry 2;

[0041] 2) The intermittent distance of slurry 2 coating on one side is 5mm;

[0042] 3) Dry the coated single-sided pole piece and pass through the coating machine head once;

[0043] 4) Carry out intermittent coating on the second side of the single-sided pole piece that has passed through the empty strip, and then coat the slurry 3, and dry the product after the coating is completed;

[0044] The prepared produc...

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Abstract

The invention relates to a method for intermittently coating a battery pole piece. The method comprises the following steps of: firstly, performing single-sided intermittent coating by using slurry according to a normal coating operation process, and drying, and rolling to form a single-sided pole piece; secondly, placing the single-sided pole piece on the head of a coating machine to pass through an empty tape for one time; and finally, performing intermittent coating on the second surface of the single-sided pole piece after passing through the empty tape, and drying to obtain a product. By the method, the coating uniformity is effectively controlled; the difference between single-sided thickness and double-sided thickness is reduced; and the misplacement of the pole piece and U-shaped fragments are improved certainly.

Description

technical field [0001] The invention relates to a coating method for battery pole pieces, in particular, the invention relates to a batch coating method for battery pole pieces. Background technique [0002] Due to the advantages of high specific capacity, high working voltage, no environmental pollution, long cycle life, and wide operating temperature range, lithium-ion batteries are widely used in electronic products such as mobile phones, notebook computers, digital cameras, and even in automobiles. In the world, with the rapid development of science and technology and economy, the functions of electronic products in the market are becoming more and more powerful, and the shape and size requirements are getting smaller and smaller, and the weight requirements are getting lighter and lighter. Therefore, the performance requirements of lithium-ion batteries are getting higher and higher. [0003] Lithium-ion battery is composed of positive electrode sheet, negative electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/32H01M4/139
CPCY02E60/122Y02E60/10
Inventor 庄志光
Owner BALEAF XIAMEN NEW ENERGY TECH
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