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Method for testing porosity of green plate

A test method, the technology of raw plates, applied in the direction of measuring device, permeability/surface area analysis, weighing by removing certain components, etc., can solve the problem of inaccurate test results, shorten the test cycle and increase the test The effect of small amount and short test time

Pending Publication Date: 2021-12-07
CHAOWEI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of inaccurate test results of the porosity of the green plate, the present invention provides a test method for the porosity of the green plate, the process method is simple, the test is convenient and quick, and the porosity of the measured green plate has high accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for testing the porosity of a raw electrode plate, comprising the following steps:

[0026] 1) Randomly select 1 piece of 6-DZF-20 and use positive raw plates to number and weigh it: record it as dry weight 98.5g;

[0027] 2) Use a vernier caliper to test the length 134.63mm, width 64.64mm, and thickness 2.36mm of the raw plate. In order to reduce the error, test the data of 5 different positions of the plate, and finally use the average value as the length, width, and thickness of the plate value;

[0028] 3) Put the raw plate in a negative pressure environment (-0.8MPa) for infiltration in absolute ethanol, take it out from absolute ethanol after 20 minutes, weigh the mass of the plate immediately after 30 seconds, record it as the wet weight of 105.5g;

[0029] 4) Remove the active material on the plate and clean it with alcohol. Dry the grid in an oven at 60±2°C for 1 hour, then weigh the weight of the grid to 19.9g, and the porosity of the first green pla...

Embodiment 2

[0033] A method for testing the porosity of a raw electrode plate, comprising the following steps:

[0034] 1) Randomly select a piece of 6-DZF-20 negative raw plate and weigh it according to the number: record it as dry weight 68.5g;

[0035] 2) Use a vernier caliper to test the length 135.88mm, width 65.00mm, and thickness 1.72mm of the raw plate. In order to reduce the error, test the data of 5 different positions of the plate, and finally take the average value as the length, width and thickness of the plate value;

[0036] 3) Put the raw plate in a negative pressure environment (-0.8MPa) for infiltration in absolute ethanol, take it out of absolute ethanol after 20 minutes, weigh the mass of the plate immediately after 30 seconds, and record it as the wet weight of 73.6g;

[0037] 4) Remove the active material on the plate and clean it with alcohol. Dry the grid in an oven at 60±2°C for 1 hour, then weigh the weight of the grid to 13.8g, and the porosity of the first gre...

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Abstract

The invention relates to the field of porosity testing, and provides a method for testing the porosity of a green plate, aiming at the problem that the test result of the porosity of the green plate is inaccurate. The method comprises the following steps of: numbering and weighing one green plate, and recording the weight as dry weight M11; measuring the length L11, the width S11 and the thickness H11 of the green plate; performing ethanol permeation on the green plate, taking out the green plate, and weighing the green plate as a wet weight M12; then removing active substances on the polar plate, drying and weighing the mass of the grid, and recording the mass as M13, wherein the porosity A11 of the first green plate is equal to (M12-M11) / rho ethanol / (L11 * S11 * H11-M13 / rho grid) * 100%; and finally, taking a plurality of green plates at the same position in parallel, repeating the previous steps to measure a plurality of porosities, and taking an average value as the porosity of the position. The process method is simple, the test is convenient and fast, and the measured porosity of the green plate is high in accuracy.

Description

technical field [0001] The invention relates to the field of porosity testing, in particular to a testing method for the porosity of a raw electrode plate. Background technique [0002] Lead-acid batteries have been invented for more than 150 years, and have been widely used due to their advantages such as good reliability, high cost performance, and recyclability. The plate is an important part of the lead-acid battery, and the characteristics of the plate play a decisive role in the performance of the battery. The minimum constituent unit of the active material structure of the positive electrode plate is lead oxide particles, and a certain number of lead oxide particles are connected to each other to form aggregates of different sizes. A large number of agglomerates and individual small particles are interconnected under certain circumstances to form aggregates or porous substances, and micropores are formed between the agglomerates that make up the aggregate. The poros...

Claims

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Application Information

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IPC IPC(8): G01N5/04G01N15/08
CPCG01N5/04G01N15/088
Inventor 马洪涛闫大龙李娟杨云珍钱欢
Owner CHAOWEI POWER CO LTD
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