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Evaluation method for amplification effect of lithium battery homogenizing process

An evaluation method, lithium battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as need to be improved, waste of manpower and material resources, and the effect of homogenization cannot be optimized.

Pending Publication Date: 2022-04-22
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the homogenization stage of lithium ions, there will be a lot of amplification problems of process parameters due to the different sizes of equipment in different stages.
At this stage, it mainly depends on the production experience of the engineer or the general parameters provided by the manufacturer for debugging. Although some homogenization parameters or methods are provided in this way, the homogenization effect is often not optimal, and several experiments are required for fine adjustment. The optimal homogenization process parameters can only be selected after the battery cell evaluation, which not only takes a long time, but also causes waste of manpower and material resources
[0003] It can be seen that the existing evaluation methods for the amplification effect of the lithium battery homogenate process still need to be improved

Method used

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  • Evaluation method for amplification effect of lithium battery homogenizing process
  • Evaluation method for amplification effect of lithium battery homogenizing process
  • Evaluation method for amplification effect of lithium battery homogenizing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix the lithium iron phosphate powder, the conductive agent powder, and the binder according to the mass ratio of 95.5:2:2.5 to prepare a slurry with a solid content of 40%, place it in a THINKY MIXER mixer, and take it out for mixing. The final slurry is coated on the aluminum foil with a 150μm scraper, dried, and the resistance R of the pole piece is tested by the ohm method. 2 is 4.8mΩ.

[0030] Using the same system, mix lithium iron phosphate powder, conductive agent powder, and binder according to the ratio of mass ratio of 95.5:2:2.5. In a 5L homogenizer, first prepare 8% binder solution, and then Add the conductive agent and mix, then add the remaining solvent and stir, finally add all the lithium iron phosphate powder and stir to complete, take out the mixed slurry, use a 150μm scraper, coat it on the aluminum foil, dry it, and test the slurry with the Ohm method Electrode resistance R 1 5.82mΩ, R 1 / R 2 is 1.21. A 2A·h cell was further assembled using the...

Embodiment 2

[0032] Mix the lithium iron phosphate powder, the conductive agent powder, and the binder according to the mass ratio of 95.5:2:2.5 to prepare a slurry with a solid content of 40%, place it in a THINKY MIXER mixer, and take it out for mixing. The final slurry is coated on the aluminum foil with a 150μm scraper, dried, and the resistance R of the pole piece is tested by the ohm method. 2 is 4.8mΩ.

[0033]Using the same system, mix lithium iron phosphate powder, conductive agent powder, and binder in a mass ratio of 95.5:2:2.5. In a 5L homogenizer, first add lithium iron phosphate powder, conductive agent powder Body, binder powder dry mixing and stirring, then add all the solvent and stir to complete, take out the mixed slurry, use a 150μm scraper, coat it on the aluminum foil, dry it, and use the ohm method to test the resistance R of the slurry pole piece 1 6.5mΩ, R 1 / R 2 is 1.35. The pole piece was further used to assemble a 2A·h battery, and the AC internal resistance...

Embodiment 3

[0035] Mix lithium iron phosphate powder, conductive agent powder and binder according to the mass ratio of 95.5:2:2.5 to prepare a slurry with a solid content of 40%, place it in a THINKY MIXER mixer, take it out and mix The final slurry is coated on the aluminum foil with a 150μm scraper, dried, and the resistance R of the pole piece is tested by the ohm method. 2 is 4.8mΩ.

[0036] Using the same system, mix lithium iron phosphate powder, conductive agent powder, and binder in a mass ratio of 95.5:2:2.5. In a 5L homogenizer, first add lithium iron phosphate powder, conductive agent powder Body, binder powder dry mixing and stirring, then add a part of solvent to form 65% solid content kneading and stirring, finally add the remaining solvent and stir to complete, take out the mixed slurry, use a 150μm scraper, coat it on aluminum foil, bake After drying, use the ohm method to test the resistance R of the slurry pole piece 1 5.2mΩ, R 1 / R 2 is 1.08. A 2A·h cell was furth...

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Abstract

The invention discloses a method for evaluating the amplification effect of a lithium battery homogenizing process. The evaluation method comprises the following steps: (1) providing amplified homogenate slurry to be detected and contrast homogenate slurry, wherein the amplified homogenate slurry to be detected is prepared by an amplified homogenate process of a lithium battery to be evaluated; (2) coating the surface of a current collector with the to-be-detected amplified homogenate slurry, and drying to obtain a to-be-detected pole piece; coating the surface of a current collector with the contrast homogenate slurry, and drying to obtain a contrast pole piece; and (3) respectively measuring the resistance of the to-be-measured pole piece and the resistance of the contrast pole piece, and evaluating the amplification effect of the lithium battery amplification and homogenization process according to the resistance value of the to-be-measured pole piece and the resistance value of the contrast pole piece. The evaluation method is simple and rapid, can comprehensively reflect the homogenizing effect of the lithium battery amplification homogenizing process, and provides guidance for improving the homogenizing process.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular, the invention relates to a method for evaluating the amplification effect of a homogenization process of a lithium battery. Background technique [0002] In the production of new lithium-ion battery systems, it is generally necessary to use button batteries to evaluate the physical and chemical properties of materials, and then go through the process of small test, pilot test and mass production. During the enlargement process, the process parameters such as coating surface density, coating size, and cutting size basically do not change with the change of equipment, and can be put into production smoothly. However, in the homogenization stage of lithium ions, there are many problems of amplification of process parameters due to different equipment sizes at different stages. At this stage, it mainly depends on the production experience of the engineer or the general parameters prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02G01R31/389
CPCG01R27/02G01R31/389
Inventor 黄本赫伍上福刘璋勇李雷詹升维王金凤吴光麟
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD