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Method for testing porosity of lithium ion battery pole piece

A lithium-ion battery and testing method technology, which is applied in the field of testing the porosity of lithium-ion battery pole pieces, can solve the problems affecting the real porosity of pole pieces, quality reduction, serious pollution, etc., to improve test accuracy, reduce deviation, Measuring the effect of low cost

Inactive Publication Date: 2017-05-31
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This test method is costly, difficult to operate and seriously polluting
[0004] In addition, domestically, there is a method (CN103134744B) in which pole pieces are immersed in the solution and weighed to calculate the porosity of the pole pieces (CN103134744B). Ignoring the quality reduction caused by the volatilization of the immersion solution after the pole piece is taken out, which affects the true porosity of the pole piece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Take a rectangular lithium iron phosphate positive pole piece, measure the length, width and thickness of the pole piece, according to V 0 = Length (L) × Width (m) × Thickness (d), get its volume V 0 =3.982×10 -5 m 3 ;

[0031] (2) Hang the pole piece on the electronic spring balance, and read the weight G of the pole piece 0 =0.8124N;

[0032] (3) Put the electrode piece suspended on the electronic spring scale into a container filled with ethylene glycol solution, so that the ethylene glycol is completely immersed in the lithium iron phosphate positive electrode piece. After soaking for 2 hours, read the value F of the electronic spring scale 1 =0.6190N;

[0033] (4) According to the formula ε=1-(G 0 -F 1 ) / ρgV 0 ×100%, the porosity ε=38.52% of the pole piece is obtained.

Embodiment 2

[0035] (1) Take a circular graphite negative electrode, measure the radius and thickness of the electrode, and then according to V 0 = πr 2 ×thickness (d) to get its volume V 0 =1.287×10 -5 m 3 ;

[0036] (2) Hang the pole piece taken on the electronic spring balance, and read the weight G of the pole piece 0 =0.3510N;

[0037] (3) Place the electrode piece suspended on the electronic spring scale in a container filled with distilled water solution, so that the distilled water completely immerses the graphite negative electrode piece, and after soaking for 2 hours, read the value F of the electronic spring scale 1 =0.2698N;

[0038] (4) According to the formula ε=1-(G 0 -F 1 ) / ρgV 0 ×100%, the porosity ε=36.94% of the pole piece is obtained.

[0039] The pole pieces tested in the above examples 1 and 2 were respectively measured for their porosity using the mercury porosimeter method and the cetane soaking quality difference method, and the data comparison is as foll...

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Abstract

The invention discloses a method for testing porosity of a lithium ion battery pole piece. The method comprises steps as follows: the lithium ion battery pole piece in a regular shape is taken, and the volume V0 of the lithium ion battery pole piece is measured; the pole piece is suspended on an electronic spring scale, and the weight G0 of the pole piece is obtained; the pole piece suspended on the electronic spring scale is totally immersed in an infiltrating type solution, and a numeric value F1 of the electronic spring scale is read after no less than 2 hours; the porosity epsilon of the pole piece is calculated according to the formula that epsilon is equal to a product obtained by multiplying the difference between 1 and the difference between G0 and F1 by 100%. The testing method has the advantages of being simple to operate, high in testing efficiency, low in testing cost and the like, complicated operation processes of mercury injection apparatus are avoided, pollution of mercury to the environment and harm of mercury to operators are reduced, and porosity test deviation caused by solution volatilization when the piece is taken out for weighing after immersion can be effectively reduced due to the fact that the volume change during immersion of the pole piece is considered in the test process and weight change after liquid absorption of the pole piece is measured in situ.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for testing the porosity of pole pieces of lithium ion batteries. Background technique [0002] Lithium-ion batteries are regarded as one of the most efficient electrochemical energy storage systems due to their high specific energy, high specific power, and environmental friendliness. Lithium-ion batteries are composed of positive and negative pole pieces and electrolyte, wherein the porosity of the pole piece is the ratio of the total volume of the tiny voids inside the pole piece to the total volume of the pole piece, and the effective porosity is the interconnected tiny voids in the pole piece The ratio of the total volume to the surface volume of the pole piece is an important parameter affecting the electrolyte transmission performance, and the porosity directly reflects the compactness of the material. If the porosity is too large, it wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00G01N15/08
CPCG01N5/00G01N15/0893
Inventor 汪伟伟彭家兴刘兴亮
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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