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Device for detecting puncture strength of diaphragm and detection method

A technology of puncture strength and testing method, which is applied in the field of diaphragm puncture strength detection device, which can solve the problems of no test puncture strength, safety accidents, battery short circuit, etc., and achieve the effect of simple structure, high reliability, and uniform stress on the diaphragm

Inactive Publication Date: 2019-01-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the puncture strength is an important index in the test item of the separator material. During the battery processing process, dust in the environment, particles on the positive and negative electrodes, burrs, lithium dendrites in the battery, etc. will directly contact the separator, and it is also possible Piercing the diaphragm, causing a short circuit in the battery and causing a safety accident
With the gradual increase of battery energy density, thinning and functionalization of the separator has become an application trend. The puncture resistance strength index of the separator is particularly important, especially it can truly reflect the puncture resistance of the separator when it is applied in the battery cell. At present, the separator industry There is no standard and reference method for testing puncture strength in China

Method used

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  • Device for detecting puncture strength of diaphragm and detection method
  • Device for detecting puncture strength of diaphragm and detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Place the polyethylene-based film sample diaphragm in an environment with a humidity of 50%±10% and a temperature of 23°C±2°C for 2 hours to adjust the test state, and then cut three 14μm-thick polyethylene-based film samples with a length of 5cm, width is 5cm;

[0043] 2) Record the sample numbers as M1, M2, and M3 respectively, and then perform thickness tests at 5 points on each sample according to the positions of the thickness test points, and record the thickness test results;

[0044] 3) Set the diaphragm puncture strength speed to 50mm / min, set the displacement value to 20mm-50mm,

[0045]4) Fix the position of the lower fixture 42, place the sample to be tested on the lower fixture 42 flatly, and the first driving mechanism 3 drives the upper fixture 41 to move downwards to ensure that the sample to be tested is closely attached to the fixture assembly 4 and is evenly stressed;

[0046] 5) The second driving mechanism 23 drives the puncture needle 21 to mov...

Embodiment 2

[0049] 1) Place the polyethylene-based film sample diaphragm in an environment with a humidity of 50%±10% and a temperature of 23°C±2°C for 2 hours to adjust the test state, and cut three 14μm-thick polyethylene-alumina ceramic samples. The length of the sample is is 5cm and the width is 5cm;

[0050] 2) Record the sample numbers as M1, M2, and M3 respectively, and then perform thickness tests at 5 points on each sample according to the positions of the thickness test points, and record the thickness test results;

[0051] 3) Set the diaphragm puncture strength speed to 50mm / min, set the displacement value to 20mm-50mm,

[0052] 4) Fix the position of the lower fixture 42, place the sample to be tested on the lower fixture 42 flatly, and the first driving mechanism 3 drives the upper fixture 41 to move downwards to ensure that the sample to be tested is closely attached to the fixture assembly 4 and is evenly stressed;

[0053] 5) The second driving mechanism 23 drives the pu...

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Abstract

The invention discloses a device for detecting puncture strength of a diaphragm and a detection method. The device for detecting the puncture strength of the diaphragm comprises a base, a puncturing component, a first driving mechanism and a clamp component, wherein a guide rail stretching along the vertical direction is arranged on the base; the clamp component is arranged on the guide rail in the manner of moving up and down; the clamp component comprises an upper clamp and a lower clamp; the upper clamp and the lower clamp are oppositely arranged and both can move relative to the guide rail; an accommodating space for clamping the diaphragm is formed between the upper clamp and the lower clamp; rubber gaskets are respectively arranged on the two opposite sides of the clamping positionsof the upper clamp and the lower clamp; through holes are oppositely formed on the upper clamp, the lower clamp and the rubber gaskets. The device for detecting the puncture strength of the diaphragmprovided by the invention has a simple structure; the height of the clamp component can be conveniently adjusted; the diaphragm is flatly clamped under the action of the rubber gaskets and is uniformly stressed. According to the detection method provided by the invention, the puncture strength of the diaphragm is not influenced by the thickness of the diaphragm; the detection method is suitable for the detection of diaphragms in different sizes; the detection result is high in reliability.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a device and a testing method for detecting the puncture strength of a diaphragm. Background technique [0002] In a lithium battery, the separator is a layer of material that separates the positive and negative electrodes and prevents the electrons in the battery from freely passing through, allowing the ions in the electrolyte to pass freely between the positive and negative electrodes. It is a very critical part of the battery. Battery safety and cost have a direct impact. Among them, the puncture strength is an important index in the test item of the separator material. During the battery processing process, dust in the environment, particles on the positive and negative electrodes, burrs, lithium dendrites in the battery, etc. will directly contact the separator, and it is also possible Piercing the diaphragm, causing the battery to short circuit and causing a safety acci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/04G01N3/00
CPCG01N3/00G01N3/04G01N2203/0003G01N2203/0252G01N2203/0282G01N2203/0405
Inventor 陈萌钱涛杨茂萍张江伟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY