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Method and device for measuring air permeability of battery diaphragm

A technology for battery separators and testing methods, which is applied to measuring devices, permeability/surface area analysis, suspension and porous material analysis, etc. It can solve the problems of expensive testing equipment, complicated operation process, inconvenient maintenance, etc., and achieve simple structure, The effect of simple principle and easy maintenance

Inactive Publication Date: 2014-09-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the test standards for battery separators mainly include GB1038 and ASTM D1434, but professional test equipment is expensive, costing tens of thousands of yuan, and the operation process is complicated and inconvenient to maintain

Method used

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  • Method and device for measuring air permeability of battery diaphragm
  • Method and device for measuring air permeability of battery diaphragm

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Embodiment Construction

[0022] Such as Figure 1-Figure 2 As shown, the battery diaphragm air permeability test device of the present invention mainly includes: an air supply system (1), a voltage stabilization system (2), a temperature change test system (3), a metering system (4), and an output end of the air supply system (1) It is connected to the voltage stabilizing system (2), the output end of the voltage stabilizing system (2) is connected to the variable temperature testing system (3), and the output end of the variable temperature testing system (3) is connected to the metering system (4), where:

[0023] The test gas is mainly air (oxygen:nitrogen=29:71 according to the volume ratio), and any other types of gases can also be tested. The gas supply system (1) is mainly composed of gas cylinder A and its supporting high and low pressure relief valves and on-off valves.

[0024] The voltage stabilization system (2) is mainly composed of the back pressure valve B and its matching needle valve, pre...

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Abstract

The invention belongs to the technical field of battery, and particularly relates to a method and device for measuring air permeability of a battery diaphragm at different pressures and different temperatures. The method for measuring the air permeability of the battery diaphragm comprises the steps of fixing and sealing the battery diaphragm; stetting a diaphragm temperature by a heating device; introducing air from an air inlet side and setting a pressure value; metering a time required by passing a certain volume of air from the air inlet side; and calculating the air permeability of the diaphragm. The device for measuring the air permeability of the battery diaphragm comprises an air supply system, a pressure stabilization system, a variable temperature measuring system and a metering system. The method and device for measuring the air permeability of the battery diaphragm have the advantages of simple operations, low cost, accurate data and high practicality. Meanwhile, the method and device can measure the air permeability of the diaphragm at different temperatures, ascertain variable relationships between the air permeability of the diaphragm and the temperature, and further study a hole closing temperature and a diaphragm broken temperature of the battery diaphragm, and can predicate battery performance changes caused by temperature variation.

Description

Technical field [0001] The invention belongs to the technical field of batteries, and particularly relates to a method and a device for testing the air permeability of a battery diaphragm. Background technique [0002] The battery diaphragm is the most important part of the battery structure. The performance of the diaphragm will affect the cycle life and charge and discharge performance of the battery to a large extent. The thickness, average pore diameter and distribution of the diaphragm become important indicators for judging battery performance. A battery separator with excellent performance will increase the capacity and cycle life of the battery, while a battery separator with poor performance will cause safety accidents such as battery fire or even explosion under severe conditions. [0003] The air permeability of a battery diaphragm refers to the time required for air to pass through the designated area diaphragm under certain conditions. It is an important indicator for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N7/10
Inventor 肖伟赵丽娜刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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