Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for testing porosity of composite diaphragm

A technology of composite diaphragm and test method, applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc. Quantitative, precise measurement, test equipment and conditions requiring less effect

Inactive Publication Date: 2014-09-17
SHENZHEN SENIOR TECH MATERIAL
View PDF3 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method provides a solution for the measurement of composite diaphragm porosity, the test process cannot be standardized and quantified, and subjective factors have a greater impact on the test results

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for testing porosity of composite diaphragm
  • Method for testing porosity of composite diaphragm
  • Method for testing porosity of composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings.

[0027] A method for testing the porosity of a battery ceramic coating film, comprising the following steps:

[0028] (1) Cut a rectangular sample at a place where the surface of the ceramic coating film to be tested is flat and uniform in thickness;

[0029] (2) The thickness of the sample is measured by a thickness gauge, and the calculated volume is V 1 ; The thickness of the intercepted ceramic-coated diaphragm sample should be uniform, the surface should be flat, and the area should be 1-100cm 2 ;

[0030] (3) Put the glass container 6 and cover 5 filled with DOP liquid inside (refer to figure 1 , figure 2 and image 3 ) on an electronic balance with an accuracy of 0.0001g. After the value is stable, the reading is cleared; the thin plastic wire 2 passes through the small hole 501 of the glass cover 5, one end is tied to the glass ro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the battery detection field, and discloses a method for testing the porosity of a composite diaphragm. The method comprises the following steps: 1, cutting a diaphragm sample; 2, measuring the volume of the diaphragm sample, and recording the volume as V1; 3, arranging a container provided with an electrolyte on an electronic balance, returning the read number to zero, fixing a circular ring by a fine wire, and recording the read number of the balance as M1 after the circular ring is completely immersed and suspends in the electrolyte; 4, fixing the diaphragm sample to the circular ring, repeating step 3, and recording the read number of the balance as M2 1-180min later; and 5, substituting to an electrolyte uptake formula of L=(rhoV1+M1-M2) / V1 to calculate the electrolyte uptake L. The method has the advantages of simple operation, accurate test result, simple equipment, strong operability, low test cost and the like.

Description

technical field [0001] The invention relates to the field of battery testing, in particular to a testing method for the porosity of composite diaphragms made of different materials. Background technique [0002] Diaphragm is a major component of lithium-ion batteries, and it is also a key factor restricting the development of lithium-ion batteries. With the continuous improvement of the performance of lithium-ion batteries, the safety of traditional polyolefin separators has been difficult to meet the demand, and some high-temperature resistant new material separators (polyimide separators) and composite separators (organic-inorganic composite separators) have been developed. . [0003] Porosity is an important control index in the diaphragm manufacturing process, but the density of different materials in the composite diaphragm is not the same, it is difficult to accurately measure the porosity of the diaphragm with the traditional weighing method. [0004] In response to...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02G01N15/08
Inventor 吴术球王今刚陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL