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Method for testing porosity of lithium-ion battery separator

The technology of a lithium ion battery and a testing method is applied in the field of testing the porosity of lithium ion battery separators, which can solve the problems of expensive instruments and consumables used for testing, cumbersome testing process, and high testing process cost, and achieves cheap and accurate instruments and consumables. High, simple test process effect

Inactive Publication Date: 2016-06-22
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to make up for the deficiencies of the prior art, the present invention provides a method for testing the porosity of lithium-ion battery diaphragms, which overcomes the problems of high cost of the test process caused by the cumbersome test process and expensive test instruments and consumables in the prior art.

Method used

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  • Method for testing porosity of lithium-ion battery separator
  • Method for testing porosity of lithium-ion battery separator
  • Method for testing porosity of lithium-ion battery separator

Examples

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Embodiment 1

[0028] The invention discloses a method for testing the porosity of a lithium-ion battery diaphragm, according to the formula The calculation of the void ratio is simple, convenient and accurate, and the instruments and consumables used in the testing process are relatively cheap.

[0029] Instruments and medicines used in the process of the present invention: film processor, precision balance (0.0001g), precision thickness gauge (±0.1μm), filter paper, tweezers, drying box.

[0030] Please refer to the attached figure 1 , which is a flow chart of a test method for the porosity of a lithium battery diaphragm disclosed by the present invention;

[0031] A method for testing the porosity of a lithium battery diaphragm, comprising the following steps:

[0032] (a) Take the lithium-ion battery separator PP film with a thickness of 20 μm and 40 μm as an example, cut a section of sample from the microporous separator to be tested, and use a punching machine to punch out 3 circula...

Embodiment 2

[0038] The invention discloses a method for testing the porosity of a lithium-ion battery diaphragm, according to the formula The calculation of the void ratio is simple, convenient and accurate, and the instruments and consumables used in the testing process are relatively cheap.

[0039] Instruments and medicines used in the process of the present invention: film processor, precision balance (0.0001g), precision thickness gauge (±0.1μm), filter paper, tweezers, drying box.

[0040] Please refer to the attached figure 1 , which is a flow chart of a test method for the porosity of a lithium battery diaphragm disclosed by the present invention;

[0041] A method for testing the porosity of a lithium battery diaphragm, comprising the following steps:

[0042] (a) Take the lithium-ion battery separator PP film with a thickness of 20 μm and 40 μm as an example, cut a section of sample from the microporous separator to be tested, and use a punching machine to punch out 3 circula...

Embodiment 3

[0048] The invention discloses a method for testing the porosity of a lithium-ion battery diaphragm, according to the formula The calculation of the void ratio is simple, convenient and accurate, and the instruments and consumables used in the testing process are relatively cheap.

[0049] Instruments and medicines used in the process of the present invention: film processor, precision balance (0.0001g), precision thickness gauge (±0.1μm), filter paper, tweezers, drying box.

[0050] Please refer to the attached figure 1 , which is a flow chart of a test method for the porosity of a lithium battery diaphragm disclosed by the present invention;

[0051] A method for testing the porosity of a lithium battery diaphragm, comprising the following steps:

[0052] (a) Taking the lithium-ion battery separator PE film with a thickness of 20 μm and 40 μm as an example, cut a section of sample from the microporous separator to be tested, and use a punching machine to punch out 3 circu...

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Abstract

The invention relates to a method for testing the porosity of a lithium-ion battery separator. The method comprises the steps of obtaining samples through punching on the lithium-ion battery separator to be tested by means of a punching machine, and recording the diameter of the samples as d; placing the samples in a drying oven to be dried, lowering temperature to indoor temperate, and measuring the thickness delta and quality M1 of each sample; selecting the sample with uniform thickness, and soaking the sample in hexadecane; adsorbing residual liquid on the surface of the sample with filter paper, weighing the sample after the surface of the filter paper does not change any more, conducting adsorption again with the filter paper, weighing the sample again till weights obtained at two successive times are equal, and recording data M2; obtaining the porosity of the lithium-ion battery separator through a calculation formula according to mass change before and after soaking. Instruments and materials adopted in the testing process are inexpensive, testing is easy and convenient, and the accuracy rate is as high as 99.99%.

Description

(1) Technical field [0001] The invention relates to the field of lithium-ion battery electrode materials, in particular to a method for testing the porosity of a lithium-ion battery diaphragm. (2) Background technology [0002] The diaphragm is an important part of the lithium-ion battery cell, which mainly plays the role of ion conductivity and electronic insulation, and the ion conductivity has a lot to do with the many tiny holes in the diaphragm, so the porosity is the key to the diaphragm. Important control indicators in the manufacturing process. When the porosity of the separator is too low, the gas permeability is poor, resulting in low electrical conductivity and other problems, while the porosity of the separator is too high, resulting in weakened puncture ability, increased shrinkage rate and poor mechanical properties of the separator, posing safety hazards. At present, although there are many methods for testing porosity, the process is cumbersome and the instr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N5/02
CPCG01N15/0893G01N5/02
Inventor 张焕吕金钊李延锋夏颖欣程浩然李进潘赵成龙王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH