Method for testing foil resistivity

A test method and resistivity technology, applied in the direction of measuring resistance/reactance/impedance, measuring device, analyzing materials, etc., to achieve the effect of simple and reliable test method, high data accuracy, and great application prospects

Inactive Publication Date: 2019-07-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual test process, there is always a non-negligible contact resistance between the foil and the fixture or test instrument

Method used

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  • Method for testing foil resistivity
  • Method for testing foil resistivity
  • Method for testing foil resistivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this embodiment, the resistivity of an aluminum foil is tested by this method. Before the test, gently wipe the surface of the aluminum foil with absolute ethanol to remove oil stains on the surface of the aluminum foil. After the ethanol volatilizes naturally, use a foil sampler to cut the aluminum foil into strips with a width of 5mm. Using a foil sampler can ensure that the sample Cut evenly without burrs. Then use a utility knife to cut the strip sample into samples with lengths of 25cm, 20cm, 15cm, and 10cm respectively, and use insulating plates or clamps to fix the samples to prevent the samples from bending and breaking. Connect the fixed samples to the electrodes at both ends of the electrochemical workstation, test the impedance of the samples with lengths of 25cm, 20cm, 15cm, and 10cm in turn, and directly read the intersection points of the curve and the Z-axis from the impedance spectrogram, which is the different lengths under the foil resistors.

[0...

Embodiment 2

[0041] To test the resistivity of a certain type of copper foil, the resistivity of a certain type of copper foil was tested by the same method as the aluminum foil resistivity test, and the specific data are summarized in Table 2. From the data in Table 2, we can see that after two parallel sample tests, the results are consistent. The average resistivity of the copper foil obtained by the test is 2.21×10 -8 Ω m, close to the resistivity of pure copper 1.75×10 -8 Ω·m, indicating that the test method provided by the present invention is accurate and reliable.

[0042] Specifically, in the above two embodiments, for the convenience of calculation, the lengths of each sample are successively increased to form an arithmetic sequence.

[0043] Table 2: Example 2 sample test data table

[0044]

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Abstract

The invention provides a method for testing foil resistivity. The method comprises the following steps: S1, cutting a foil to be tested into a plurality of samples with different lengths and equal widths; S2, testing the resistance Ri of each sample, wherein i is a sample number; S3, drawing a coordinate taking the length Li of each sample as a transverse axis and taking the resistance Ri of eachsample as a longitudinal axis, substituting each coordinate point (Li, Ri) into the coordinate to draw an oblique line, and acquiring the slope k of the oblique line, wherein i is an element of a set(1, n), and n is the quantity of samples; and S4, acquiring the resistivity of the foil to be tested according to a slope curve k=rho / S, wherein rho is the resistivity, and S is the cross sectional area of each sample of a unit length. According to the method, the slope k is obtained through coordinate fitting, so that the influence of external resistance on sample testing is eliminated, and the intrinsic resistivity of the foil to be tested can be calculated accurately. The testing method is simple and reliable, has high data accuracy, can realize accurate measurement of the resistivity of the foil, and has great application prospect in the field of lithium ion battery current collectors.

Description

technical field [0001] The invention relates to the technical field of current collectors for lithium ion batteries, in particular to a method for testing the resistivity of foil materials. Background technique [0002] Lithium-ion batteries have the advantages of high voltage and energy density, long cycle life, high energy efficiency, no memory effect, and low environmental pollution. Therefore, lithium-ion batteries are widely used in various portable electronic products, electric vehicles, and large power supplies. , secondary charging and energy storage and other fields. [0003] In lithium-ion batteries, the current collector refers to the base metal used to attach the active material to the positive or negative electrode of the battery. For lithium-ion batteries, aluminum foil is commonly used as the positive current collector and copper foil as the negative current collector. The current collector is in contact with the active material to collect the current genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02G01N27/416
CPCG01N27/416G01R27/02
Inventor 鲁扬
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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