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Porosity testing tool and testing method thereof

A technology for testing tooling and testing methods, which is applied in measuring devices, permeability/surface area analysis, suspension and porous material analysis, etc., and can solve problems such as poor accuracy of porosity testing, springback of electrode sheets or diaphragms, etc.

Pending Publication Date: 2022-01-18
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a kind of porosity testing equipment and testing method thereof, to solve the problem that the electrodes will be damaged after the pressure is released after the pressure is applied to the electrode piece or diaphragm during the existing mercury porosimetry test and gas adsorption method (BET) test process. The springback of the sheet or diaphragm results in poor porosity test accuracy

Method used

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  • Porosity testing tool and testing method thereof
  • Porosity testing tool and testing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A test method for porosity, comprising:

[0052] Take a fresh separator (referring to the separator that has not been assembled into a battery, the thickness is 14 μm, and the thickness of the PE base film is 9 μm, Al 2 o 3 The thickness of the ceramic layer is 3 μm, and the thickness of PVDF coated on both sides is 1 μm) as the sample to be tested, which is soaked in dimethyl carbonate (DMC) for 20 minutes, cleaned and dried. Fold the above-mentioned fresh septum in half, and ensure that the septum is flat.

[0053] Such as figure 1In the schematic diagram of the porosity test tooling structure shown, the folded sample to be tested is placed in the chamber 110 of the liquid nitrogen quenching part 100, and pressure is applied through the torque wrench 260, and the pressure value is observed. When the applied pressure reaches 3000N, Keep it for 5 minutes. At this time, the porosity test tool shows that the pressure is 2542N. Continue to increase the pressure to make ...

Embodiment 2

[0057] The difference from Example 1 is that the applied pressure is 1000N.

Embodiment 3

[0059] The difference from Example 1 is that the applied pressure is 5000N.

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Abstract

The invention provides a porosity testing tool and a testing method thereof. The porosity testing tool comprises a liquid nitrogen cold quenching part, a pressurizing part and a porosity testing part. A cavity is formed in the liquid nitrogen cold quenching part and used for storing liquid nitrogen and storing a to-be-tested sample, and the to-be-tested sample comprises an electrode plate and / or a battery diaphragm; the pressurizing part is used for applying pressure to the to-be-tested sample; and the porosity testing part is used for testing pores in the to-be-tested sample which is subjected to liquid nitrogen cold quenching. The cold quenching treatment on the to-be-tested sample (the electrode plate and / or the battery diaphragm) can inhibit the to-be-tested sample from springback due to pressure relief after pressure is applied to the to-be-tested sample. On one hand, the real state of the to-be-tested sample can be kept, and the morphological change of the to-be-tested sample in a pressure state can be truly reflected; on the other hand, the adverse effect of springback of the to-be-tested sample after pressure relief on the porosity testing result can be inhibited, the error of the porosity testing result can be reduced, and the porosity testing accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of porosity testing, in particular to a porosity testing tool and a testing method thereof. Background technique [0002] In the development process of secondary batteries such as lithium-ion power batteries, the selection of battery separator plays a pivotal role in the design of battery cells, and porosity is a key parameter in the selection of battery separator. Based on the level of the single cell, the selection of the battery separator directly affects the infiltration of the electrolyte on the pole piece, affects the interface of the pole piece, and then affects the cycle capacity and service life of the battery cell; in addition, the porosity of the pole piece directly affects the compaction density of the pole piece , The design of the cell injection coefficient, which in turn affects the cycle performance of the cell. Based on the module level, the cell during the cycle is affected by the initial ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 于奥张要军何见超高飞骆兆军杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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