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Lithium ion battery pole piece adhesive power testing method

A lithium-ion battery and testing method technology, which is applied in the field of lithium-ion battery pole piece adhesion testing, can solve problems such as the inability to judge the adhesion strength of powder materials, insufficient consideration of pole piece swelling, and the impact of lithium battery performance.

Inactive Publication Date: 2019-11-01
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can judge the bonding force between the material and the foil, but it cannot judge the bonding force between the powder materials, and the bonding force between the coating material and the coating material also has a great influence on the performance of the lithium battery. big impact
In addition, this method does not fully consider the swelling of the pole piece in the electrolyte, which truly and effectively reflects the strength of the adhesion of the lithium battery in the actual application process.

Method used

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  • Lithium ion battery pole piece adhesive power testing method
  • Lithium ion battery pole piece adhesive power testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A test method for the adhesion of lithium-ion battery pole pieces, comprising the following steps:

[0026] Prepare the negative electrode sheet samples of lithium-ion batteries first: use slurries with different binder contents, and coat them to obtain sample negative electrode sheets I, II, III, and IV.

[0027] (1) Cut the negative electrode sheet I of the sample into an area of ​​20cm 2 Circular pole piece, weighed to obtain the initial weight M1;

[0028] (2) Soak pole piece I in ethanol for 1 min, keep the pole piece perpendicular to the liquid plane in the ultrasonic instrument and fully submerged;

[0029] (3) Turn on the ultrasound, the ultrasound power is 600W, the ultrasound frequency is 20KHz, the ultrasound time is 30s, and the test pole piece is taken out after a period of ultrasound;

[0030] (4) Bake the post-ultrasound pole piece I in an oven at 50°C for 30 minutes, weigh it after drying, and obtain the initial weight M2;

[0031] (5) According to th...

Embodiment 2

[0037] A test method for the adhesion of lithium-ion battery pole pieces, comprising the following steps:

[0038] Firstly prepare negative electrode sheet samples of lithium-ion batteries: the preparation method is the same as in Example 1, and sample negative electrode sheets I, II, III, and IV are obtained.

[0039] (1) Cut the negative electrode sheet I of the sample into an area of ​​20cm 2 Circular pole piece, weighed to obtain the initial weight M1;

[0040] (2) Soak pole piece I in ethanol for 1 min, keep the pole piece perpendicular to the liquid plane in the ultrasonic instrument and fully submerged;

[0041] (3) Turn on the ultrasound, the ultrasound power is 100W, the ultrasound frequency is 40KHz and the ultrasound time is 120s. After a period of ultrasound, take out the test pole piece;

[0042] (4) Bake the post-ultrasound pole piece I in an oven at 110°C for 5 minutes, weigh after drying, and obtain the initial weight M2;

[0043] (5) According to the differ...

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Abstract

The invention belongs to the technical field of lithium ion batteries and discloses a lithium ion battery pole piece adhesive power testing method. The method comprises the following steps: firstly, weighing a to-be-tested lithium battery pole piece slitting part, then, putting the part into an ultrasonic instrument liquid for soaking, keeping the pole piece perpendicular to the liquid plane of anultrasonic container, soaking for a period of time and then starting the ultrasound, taking out the test pole piece after the ultrasound for a period of time, putting the test pole piece in a dryingoven for baking, weighing after drying, calculating the weight loss ratio of the pole piece, and judging the adhesive power of the pole piece according to the weight loss ratio. According to the method in the invention, under the condition that the existing process conditions and technological processes are not changed, a theory that the pole piece coating materials can be mutually separated fromeach other under ultrasonic vibrations or fall off from a current collector and different adhesive power causes different falling weight of the coating layer is used, so that the adhesive power between the lithium ion pole piece coating material and a coating material and the adhesive power between the coating material and the current collector can be rapidly and effectively measured, and effective support is provided for the design, analysis and improvement of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for testing the adhesion of pole pieces of lithium-ion batteries. Background technique [0002] In recent years, with the depletion of fossil energy and the increasingly serious environmental pollution problems, the new energy industry has attracted the attention of governments around the world, and a wave of electrification of vehicles has been set off worldwide. Lithium-ion batteries have become a research hotspot in the world today because of their advantages such as high energy density, high power, long life, and no memory effect, and because they are the heart of new energy electric vehicles, their performance directly affects electric vehicles. security applications. [0003] Lithium-ion batteries are assembled from positive and negative electrodes and diaphragms by winding or lamination into bare cells, loaded into the case, and injected with electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 张延强刘福园刘艳侠马安博李蒙刘凡于天恒赵冲冲
Owner 郑州中科新兴产业技术研究院