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Test method and test device for liquid absorption rate of macromolecular microporous diaphragm

A technology of microporous diaphragm and testing method, which is applied in the direction of material absorption and weighing, can solve the problems of poor consistency and reproducibility of test results, large artificial errors of test results, comparison of coated diaphragm and base film, etc., to achieve Representative, convincing, consistent and reproducible results

Active Publication Date: 2014-09-24
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the test of the liquid absorption rate and liquid retention rate of the diaphragm is measured by the soaking solvent weighing method. Due to the influence of human factors and environmental factors, the consistency and reproducibility of the test results are relatively poor; The processing method is relatively rough, which introduces a large human error to the test results; in addition, due to the difference in the density of the coating material of the coating diaphragm and the material density of the base film, the calculation method in this measurement method cannot be used for the coating diaphragm and the base film. comparison between

Method used

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  • Test method and test device for liquid absorption rate of macromolecular microporous diaphragm

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Experimental program
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Effect test

Embodiment

[0036] Randomly select a roll of PP separator and ceramic coated separator with a thickness of 20 μm and qualified performance. Cut the separator into five groups of samples with a size of 65*1500mm, and wind them into cores with 38mm wide needles.

[0037] Take a piece of aluminum-plastic film for flexible packaging of lithium ions, cut the aluminum-plastic film into a size of 103*176mm, put the core into the aluminum-plastic film shell, and use the top-side sealing machine to seal the aluminum-plastic film on the top and side , The heat sealing temperature is about 175°C, and the samples are marked.

[0038]Put the top-side-sealed aluminum-plastic film into a vacuum oven and bake for 2 hours at a temperature of 80°C and a vacuum degree of <-0.09MPa.

[0039] Test Set Reference figure 1 , including a glove box 1, the glove box 1 is sealed and separated into three independent spaces, and a liquid injection device 2, a vacuum static device 3 and a vacuum heat sealing device 4...

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Abstract

The invention discloses a test method for a liquid absorption rate of a macromolecular miroporous diaphragm. The test method comprises the following steps: step 1: producing a roll core according to a wound or laminated lithium ion battery, placing the roll core into an aluminum-plastic membrane, and capping and laterally sealing the aluminum-plastic membrane to obtain a diaphragm sample; step 2: carrying out vacuum baking on the diaphragm sample; step 3: weighing the baked diaphragm sample, recording the weight as G1; step 4: immersing the diaphragm sample into a solution; step 5: weighing the vacuumized and hot-sealed aluminum-plastic membrane, and recording the weight as G2, wherein the calculation formula of the liquid absorption rate of the diaphragm is as follows: eta=(G2-G1) / S*100%. The invention also discloses a test device. The test method and test device have the advantages that the manmade error can be reduced, the environment influence is alleviated, the consistency and reproducibility of the test result are high, and convenience for comparing the liquid absorption performance of the coated diaphragm and the liquid absorption performance of a basic membrane can be achieved.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a high-efficiency battery that can reduce human errors and environmental impacts, has high consistency and reproducibility of test results, and facilitates the comparison of liquid absorption performance between the coated diaphragm and the base film. A test method and a test device for the liquid absorption rate of a molecular microporous membrane. Background technique [0002] Since its launch, lithium-ion batteries have become the most competitive in the field of chemical power sources due to their high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental protection compared with other secondary batteries. Battery. At present, lithium-ion batteries have been widely used in notebook computers, digital products, electric vehicles, hybrid vehicles and even aerospace and other fields. With the development of new energy electric vehicles,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02
Inventor 李世隆杨佳富
Owner SHENZHEN SENIOR TECH MATERIAL
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