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

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,...

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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

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