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Perpendicular detecting method for detecting battery diaphragm liquid absorption speed and liquid protection volume

A detection method and a battery separator technology, which are applied in measuring devices, suspension and porous material analysis, permeability/surface area analysis, etc., can solve the problems that the ratio of samples affects the accuracy and timeliness of detection results, and achieve low implementation difficulty , Precise fluid retention and improved accuracy

Active Publication Date: 2019-05-10
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a vertical detection method for detecting the liquid absorption rate and liquid retention capacity of the battery diaphragm in view of the deficiencies in the prior art, so as to solve the problem that the existing battery diaphragm detection method cannot be fast and accurate due to the detection process. The problem that the accuracy and timeliness of the test results are affected by the differences between eye-catching comparison samples

Method used

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  • Perpendicular detecting method for detecting battery diaphragm liquid absorption speed and liquid protection volume
  • Perpendicular detecting method for detecting battery diaphragm liquid absorption speed and liquid protection volume
  • Perpendicular detecting method for detecting battery diaphragm liquid absorption speed and liquid protection volume

Examples

Experimental program
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Effect test

Embodiment 1

[0042] see figure 1 , the diagram provides a flow chart of a vertical detection method for detecting the liquid absorption rate and liquid retention capacity of the battery diaphragm for this embodiment, and the method includes the following steps:

[0043] S101: Cutting the battery separator to be tested into a preset shape to obtain a separator sample;

[0044] The preset shape is a rectangle or a trapezoid, and the specific area size is determined by the size of the sample, while the diaphragm sample in this embodiment is a rectangle, its length L is 150-300 mm, and its width is 70-150 mm;

[0045] S102: Hang the diaphragm sample vertically, and draw marks on the lower and upper parts of the diaphragm sample respectively, denoted as L1 and L2; specifically, in this embodiment, a 5 ~ 30g glass rod, the diaphragm sample is pulled by the glass rod to keep it vertical to the ground;

[0046] Specifically, hang the diaphragm sample vertically above the infiltrator; the marked ...

Embodiment 2

[0059] see figure 2 , the diagram provides one of the specific flowcharts of a vertical detection method for detecting the liquid absorption rate and liquid retention capacity of the battery diaphragm for this embodiment, and the method includes the following steps:

[0060] S201: Cutting the battery separator to be tested into a preset shape to obtain a separator sample;

[0061] The preset shape is a rectangle or a trapezoid, and the specific area size is determined by the size of the sample, while the diaphragm sample of this embodiment is a rectangle, its length L is 100-200 mm, and its width is 50-100 mm;

[0062] S202: hang the diaphragm sample vertically, and mark the lower part and the upper part of the diaphragm sample respectively, denoted as L1 and L2;

[0063] Specifically, hang the diaphragm sample vertically above the infiltrator; the marked marks are all horizontal lines balanced on the ground, L1 represents the distance from the lower marking line of the diap...

Embodiment 3

[0075] see image 3 , the diagram provides the second specific flow chart of a vertical detection method for detecting the liquid absorption rate and liquid retention capacity of the battery diaphragm for this embodiment, and the method includes the following steps:

[0076] S301: Cutting the battery separator to be tested into a preset shape to obtain a separator sample;

[0077] The preset shape is a rectangle or a trapezoid, and the specific area size is determined by the size of the sample, while the diaphragm sample of this embodiment is a rectangle, its length L is 100-200mm, and its width is 50-100mm;

[0078] S302: hang the diaphragm sample vertically, and draw marks on the lower and upper parts of the diaphragm sample respectively, denoted as L1 and L2;

[0079] Specifically, hang the diaphragm sample vertically above the infiltrator; the marked marks are all horizontal lines balanced on the ground, L1 represents the distance from the lower marking line of the diaphr...

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Abstract

The invention discloses a perpendicular detecting method for detecting battery diaphragm liquid absorption speed and liquid protection volume. The perpendicular detecting method for detecting the battery diaphragm liquid absorption speed and the liquid protection volume is convenient to operate, has small implementation difficulty, and battery diaphragms are tested through the steps such as interception and perpendicular infiltration. Compared with a traditional steeping method, a capillary phenomenon of micropore diaphragms is used in perpendicular detecting, an electrolyte solution is absorbed, and the situation that the steeping method affects an experiment result due to uncertainty of filter paper absorption time is avoided; moreover, an inert color developing agent is added into a testing solution, significant differences between samples can be intuitively observed, and the timeliness of diaphragm testing is improved; and furthermore, a drying step is additionally arranged, the dried diaphragm samples are adopted to calculate, the influence of lithium salt in the testing solution on the diaphragm samples can be removed, so that the liquid protection volume of the battery diaphragms is calculated more accurately, and thus, the accuracy of diaphragm testing is improved.

Description

technical field [0001] The invention relates to the technical field of battery diaphragms, in particular to a vertical detection method for detecting the liquid absorption rate and liquid holding capacity of the battery diaphragm. Background technique [0002] Diaphragm is an important part of liquid lithium-ion secondary battery. Its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle performance and safety performance of the battery. A diaphragm with excellent performance can improve the performance of lithium-ion batteries. Overall performance plays an important role. [0003] The ionic conductivity of the battery is one of the most important factors affecting the performance of the battery. The higher the ionic conductivity, the higher the concentration of conductive ions in the electrolyte, and the stronger the ability of the battery to conduct current. The better wettability of the diaphragm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N15/08
Inventor 褚林波杜雪丽徐大伟牛会琴江柯成
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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