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Method for testing liquid absorption rate of battery diaphragm

A test method and battery diaphragm technology, applied in the direction of using material absorption and weighing, etc., can solve the problems of poor reproducibility and accuracy of test results, large diaphragm quality errors, and large impact on test results. The process is easy to standardize and quantify, Precise measurement, testing equipment and conditions require less effect

Inactive Publication Date: 2014-01-15
SHENZHEN SENIOR TECH MATERIAL
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AI Technical Summary

Problems solved by technology

Due to the large error in the weighing of the diaphragm after absorbing liquid, the reproducibility and accuracy of the test results are poor, and the subjectivity of the tester has a great influence on the test results

Method used

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  • Method for testing liquid absorption rate of battery diaphragm
  • Method for testing liquid absorption rate of battery diaphragm
  • Method for testing liquid absorption rate of battery diaphragm

Examples

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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 liquid absorption rate of a battery diaphragm, comprising the following steps:

[0028] (1) Cut a rectangular sample at a place where the battery separator to be tested is flat and uniform;

[0029] (2) The thickness of the sample is measured by the thickness gauge, and the calculated volume is V 1 ; The thickness of the intercepted 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 the cover 5 containing the electrolyte solution inside (refer to figure 1 , figure 2 with 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 rod 1, and the other end...

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Abstract

The invention relates to the field of battery detection and discloses a method for testing the liquid absorption rate of a battery diaphragm. The method comprises the following steps: (1) intercepting a diaphragm sample; (2) measuring the volume of the diaphragm sample, and recording the volume as V1; (3) putting a container filled with an electrolyte on an electronic scale, making the reading return to zero, fixing a circular ring by using a fine line, and recording reading of the scale as M1 after the circular ring is completely immersed and suspended in the electrolyte; (4) fixing the diaphragm sample on the circular ring, repeating the step (3), and recording reading of the scale as M2 within 1-180 minutes; and (5) substituting a formula L=(rhoV1+M1-M2) / V1 of the liquid absorption rate, and calculating the liquid absorption rate L. The method has the advantages of simplness in operation, accurate test result, simple equipment, high operability, low test cost and the like.

Description

technical field [0001] The invention relates to the field of battery detection, in particular to a method for testing the liquid absorption rate of a battery diaphragm with simple operation and accurate testing. Background technique [0002] A lithium-ion battery consists of a positive electrode, a negative electrode, a separator, and an electrolyte. The separator is placed between the positive and negative electrodes. Its main function is to isolate the positive and negative electrodes, but to allow the ions in the battery to pass freely. The ion conductivity of the battery separator is directly related to the overall performance of the battery. The higher the conductivity of the diaphragm, the greater the amount of ions passing through the diaphragm per unit area per unit time. At this time, the charge and discharge performance of the battery will increase. [0003] The liquid absorption rate of the separator not only reflects the affinity between the separator and the e...

Claims

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Application Information

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IPC IPC(8): G01N5/02
Inventor 陈秀峰陈良吴术球杨佳富王今刚
Owner SHENZHEN SENIOR TECH MATERIAL
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