CN203811516U - Testing device for air permeability of battery diaphragms - Google Patents
Testing device for air permeability of battery diaphragms Download PDFInfo
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- CN203811516U CN203811516U CN201420258808.5U CN201420258808U CN203811516U CN 203811516 U CN203811516 U CN 203811516U CN 201420258808 U CN201420258808 U CN 201420258808U CN 203811516 U CN203811516 U CN 203811516U
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- diaphragm seal
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- 238000012360 testing method Methods 0.000 title claims abstract description 56
- 230000035699 permeability Effects 0.000 title claims abstract description 43
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000009172 bursting Effects 0.000 abstract 1
- 239000012466 permeate Substances 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 22
- 230000004888 barrier function Effects 0.000 description 20
- 238000010998 test method Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 6
- 239000012528 membrane Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000008393 encapsulating agent Substances 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229920006311 Urethane elastomer Polymers 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model belongs to the technical field of batteries, and particularly relates to a testing device for the air permeability of battery diaphragms. The testing device for the air permeability of the battery diaphragms is used for testing the air permeability of the battery diaphragms under different pressures at different temperatures and comprises an air supply system, a pressure stabilizing system, a temperature-variable testing system and a metering system. A testing method for the air permeability of the battery diaphragms includes fixing and sealing a battery diaphragm; setting the temperatures of the diaphragm by the aid of a heating device; enabling air to flow through the battery diaphragm via an air inlet side and setting pressure values; metering the required time when a certain volume of air permeates through an air permeation side of the battery diaphragm; computing the air permeability of the diaphragm. The testing device for testing the air permeability of the battery diaphragms has the advantages of simplicity in operation, low cost, accurate data, high practicality and the like. Besides, the air permeability of the diaphragms at the different temperatures can be tested by the aid of the testing method and the testing device, relations between change of the air permeability of the diaphragms and change of the temperatures can be verified, hole closing temperatures and diaphragm bursting temperatures of the battery diaphragms can be studied, and battery performance change due to the change of the temperatures can be predicted to a certain degree.
Description
Technical field
The utility model belongs to battery technology field, particularly a kind of battery diaphragm septum permeability testing device.
Background technology
Battery diaphragm is a most important part in battery structure, and the quality of membrane properties will affect cycle life and the charge-discharge performance of battery to a great extent, and membrane thicknesses, average pore size and distribution become the important indicator of differentiating battery performance.The battery diaphragm of function admirable will promote capacity and the cycle life of battery, and the battery diaphragm of poor-performing will cause battery on fire under mal-condition, even the security incident such as blast.
The air permeability of battery diaphragm refers under certain condition, and air is by giving directions the area needed time of barrier film, and it is the important indicator of evaluating membranes pores structure, is the important parameter of barrier film on battery performance impact.At present, the testing standard of battery diaphragm mainly contains GB1038, ASTM D1434, but professional test equipment price is expensive, and tens thousand of units, and operating process are easily complicated, and inconvenience is safeguarded.Therefore,, in order to meet the requirement of laboratory low cost, Fast Measurement battery diaphragm air permeability, need to invent new method and device thereof according to its test philosophy.
Utility model content
The purpose of this utility model is to provide a kind of battery diaphragm septum permeability testing device, with the air permeability of this device to test battery diaphragm, have simple to operate, with low cost, data are accurate, the advantage such as practical.Simultaneously, this proving installation can be tested the air permeability of different temperatures lower diaphragm plate, verify the air permeability of barrier film and the variation relation of temperature, and then closed pore temperature and the broken film temperature of research battery diaphragm, can change the battery performance variation causing by predicted temperature to a certain extent.
The technical solution of the utility model is:
A kind of battery diaphragm septum permeability testing device, this proving installation comprises: air supply system, voltage-stabilizing system, temperature variation testing system, metering system, the output terminal of air supply system is communicated with voltage-stabilizing system, the output terminal of voltage-stabilizing system and temperature variation testing system connectivity, the output terminal of temperature variation testing system is communicated with metering system.
Described battery diaphragm septum permeability testing device, temperature variation testing system by thering is the diaphragm sealing structure of temperature adjustment function, the battery diaphragm of testing forms, the diaphragm sealing structure with temperature adjustment function is provided with: air intake opening, gas outlet, O-ring seal, stainless steel mesh, battery diaphragm, diaphragm seal chamber I, engaging lug I, engaging lug II, diaphragm seal chamber II, bolt, and concrete structure is as follows:
Diaphragm seal chamber I, diaphragm seal chamber II are oppositely arranged by seam and dock and form diaphragm seal chamber, and battery diaphragm is between diaphragm seal chamber I, diaphragm seal chamber II, and the other lining of battery diaphragm is with 50 order～400 order stainless steel mesh; The inner side at relative position place between diaphragm seal chamber I, diaphragm seal chamber II, one end of diaphragm seal chamber I arranges battery diaphragm by O-ring seal, and the inboard of battery diaphragm arranges stainless steel mesh; The outside at relative position place between diaphragm seal chamber I, diaphragm seal chamber II, one end of diaphragm seal chamber I arranges engaging lug I, and the other end of diaphragm seal chamber II arranges engaging lug II, is bolted fixing between engaging lug I and engaging lug II; The other end of diaphragm seal chamber I is provided with air intake opening, and the other end of diaphragm seal chamber II is provided with gas outlet.
The battery diaphragm air permeability method of testing of described device, adopts level pressure to measure technique, and method of testing comprises following five steps: (1) fixing also sealed cell barrier film; (2) by heating arrangement, set barrier film temperature; (3) air intake opening one side ventilation setup pressure value; (4) metering breathable sides sees through certain volume gas required time; (5) calculate the air permeability of barrier film.
Described battery diaphragm air permeability method of testing, the encapsulant of battery diaphragm is made by rubber, plastics, graphite or compound substance, need to select according to probe temperature: in the time of 200～300 ℃, adopt the O-ring seal of graphite or polytetrafluoroethylmaterial material, during lower than the lower temperature of 200 ℃ to-30 ℃, select the O-ring seal of urethane rubber or butyl rubber material.
Described battery diaphragm air permeability method of testing, the encapsulant skin of battery diaphragm has attemperating unit, air permeability data in-30 ℃～300 ℃ temperature ranges of convenient test, attemperating unit temperature rate remains on 5 ℃～30 ℃/min.
Described battery diaphragm air permeability method of testing, the device that temperature variation testing system temperature is controlled by temperature-adjustables such as high low temperature experimental boxs completes, and adopts temperature-gradient method mode: lower than 200 ℃ to-30 ℃, heating rate is 20～30 ℃/min; 200 ℃ to 300 ℃, heating rate is 5～30 ℃/min.
Described battery diaphragm air permeability method of testing, the pressure of air intake opening one side is by gas handling system reduction valve and voltage-regulating system counterbalance valve co-controlling, impact for fear of air-flow to barrier film, air inlet wall pressure should rising, rises to the 0.1MPa used time be greater than 20s by 0MPa.
Described battery diaphragm air permeability method of testing, in battery diaphragm air permeability method of testing, main measurement parameter comprises: testing sample area A (m
2), the poor △ P of barrier film pressure at both sides (Pa), see through gas volume V (cm
3), required time T (s), air permeability value G
v (100)=100T/ (A *
△p * V).
Described battery diaphragm air permeability method of testing, the gas permeation time need measure after gas is stable, at three measurement numerical value of priority, differs and is less than 2%.
Advantage of the present utility model and beneficial effect are:
1, the utility model provides a kind of battery diaphragm septum permeability testing device, this principle of device is simple, can to the pore structure of battery diaphragm, predict quantitatively, facilitate between different barrier films and contrast, and the membrane configuration that temperature variation is caused changes and to study, tentatively determine closed pore temperature and the broken film temperature of battery diaphragm.
2, battery diaphragm septum permeability testing device of the present utility model, have simple in structure, compact, easy operating, cost is low, be easy to the advantages such as maintenance, is highly suitable for the mechanisms such as related scientific research institutes and uses.
Accompanying drawing explanation
Fig. 1 is the battery diaphragm septum permeability testing device schematic diagram that the utility model provides.
In figure, (one) air supply system; A gas cylinder; (2) voltage-stabilizing system; B counterbalance valve; (3) temperature variation testing system; C has the diaphragm sealing structure of temperature adjustment function; The battery diaphragm that D tests; (4) metering system; E soap bubble flowmeter or wet test meter.
Fig. 2 is the battery diaphragm sealed structural representation that the utility model provides.In figure, 1 air intake opening; 2 gas outlets; 3 O-ring seals; 4 battery diaphragms; 5 stainless steel mesh; 6 diaphragm seal chamber I; 7 engaging lug I; 8 engaging lug II; 9 diaphragm seal chamber II; 10 bolts.
Embodiment
As Figure 1-Figure 2, the utility model battery diaphragm septum permeability testing device mainly comprises: air supply system (), voltage-stabilizing system (two), temperature variation testing system (three), metering system (four), the output terminal of air supply system () is communicated with voltage-stabilizing system (two), the output terminal of voltage-stabilizing system (two) is communicated with temperature variation testing system (three), the output terminal of temperature variation testing system (three) is communicated with metering system (four), wherein:
Test is mainly air (oxygen by volume: nitrogen=29:71), also can test other any kind gases with gas.Air supply system (one) mainly consists of gas cylinder A and matching used high and low pressure reduction valve and switch valve etc.
Voltage-stabilizing system (two) is mainly comprised of counterbalance valve B and matching used needle valve, tensimeter and switch valve etc., voltage-stabilizing system (two) by counterbalance valve regulate, the fixing pressure of barrier film air intake opening one side.
Temperature variation testing system (three) mainly forms by having the diaphragm sealing structure C of temperature adjustment function, the battery diaphragm D testing, and the device that temperature variation testing system temperature is controlled by temperature-adjustables such as high low temperature experimental boxs completes.Adopt temperature-gradient method mode, low-temperature zone as: lower than 200 ℃ to-30 ℃ (heating rate is 20 ℃/min), high temperature section is as 200 ℃ to 300 ℃ (heating rate is 5 ℃/min).
Metering system (four) is mainly comprised of gas gauge and gas volumetric displacement meter, and wherein volumetric flow of gas is counted soap bubble flowmeter or wet test meter E.
In the utility model proving installation, tensimeter used is higher level, as: more than 0.25 grade.
As shown in Figure 2, the diaphragm sealing structure with temperature adjustment function mainly comprises: air intake opening 1, gas outlet 2, O-ring seal 3, battery diaphragm 4, stainless steel mesh 5, diaphragm seal chamber I 6, engaging lug I 7, engaging lug II 8, diaphragm seal chamber II 9, bolt 10 etc., and concrete structure is as follows:
Diaphragm seal chamber I 6, diaphragm seal chamber II 9 are oppositely arranged by seam and dock and form diaphragm seal chamber, and battery diaphragm 4 is between diaphragm seal chamber I 6, diaphragm seal chamber II 9, and the other lining of battery diaphragm 4 is with 50 order～400 order stainless steel mesh 5; The inner side at relative position place between diaphragm seal chamber I 6, diaphragm seal chamber II 9, one end of diaphragm seal chamber I 6 arranges battery diaphragm 4 by O-ring seal 3, and the inboard of battery diaphragm 4 arranges stainless steel mesh 5; The outside at relative position place between diaphragm seal chamber I 6, diaphragm seal chamber II 9, one end of diaphragm seal chamber I 6 arranges engaging lug I 7, the other end of diaphragm seal chamber II 9 arranges engaging lug II 8, between engaging lug I 7 and engaging lug II 8, by bolt 10, is connected and fixed.The other end of diaphragm seal chamber I 6 is provided with air intake opening 1, and the other end of diaphragm seal chamber II 9 is provided with gas outlet 2.
The utility model battery diaphragm air permeability method of testing, adopts level pressure to measure technique, and method of testing comprises following five steps: (1) fixing also sealed cell barrier film; (2) by heating arrangement, set barrier film temperature; (3) air intake opening one side ventilation setup pressure value; (4) metering breathable sides sees through certain volume gas required time; (5) calculate the air permeability of barrier film.
The encapsulant of battery diaphragm is made by rubber, plastics, graphite and compound substance etc., need to select according to probe temperature, as: the O-ring seal of the material such as 200～300 ℃ of appropriate to the occasion employing graphite or teflon, lower than the appropriate to the occasion O-ring seal of selecting the materials such as urethane rubber or butyl rubber of the lower temperatures of 200 ℃ to-30 ℃.During seal operation, must handle with care, avoid damaging barrier film, affect test result.
The encapsulant skin of battery diaphragm has attemperating unit, air permeability data in-30 ℃～300 ℃ temperature ranges of convenient test.Attemperating unit temperature rate remains on 5 ℃～30 ℃/min, is preferably 10 ℃～20 ℃/min.
The pressure of air intake opening one side is by gas handling system reduction valve and voltage-regulating system counterbalance valve co-controlling, and for avoiding the impact of air-flow to barrier film, air inlet wall pressure should rising, as: by 0MPa, rise to the 0.1MPa used time and be greater than 20s.
In described battery diaphragm air permeability method of testing, main measurement parameter comprises: testing sample area A (m
2), the poor △ P of barrier film pressure at both sides (Pa), see through gas volume V (cm
3), required time T (s), air permeability value G
v (100)=100T/ (A *
△p * V).The gas permeation time need measure after gas is stable, as: successively measure numerical value for three times and differ and be less than 2% and be advisable.
The utility model is improvements over the prior art, and main improvement is transformation and alternating temperature two aspects of proving installation, and the barrier film in the utility model proving installation is to keep in the casing of controllable temperature, can arbitrarily change the temperature of film to be measured; The air inlet wall pressure of proving installation can arbitrarily regulate; Near barrier film, the screen cloth of auxiliary high order number, can be practically applicable to the diaphragm material that elasticity is high; Although the utility model proving installation comprises four systems, preparation cost is cheap.
Through above-mentioned improvement, can under different condition, test the permeability of perforated membrane, obtain the air permeability of barrier film and the interdependence of temperature and pressure, contribute to analyze the pore passage structure of barrier film; And can be large to elasticity, the less membrane material in aperture carries out larger pressure test, and needn't worry that film is damaged.It is simple that the utility model method of testing and device have principle, easy operating, and work efficiency is high, test and the advantage such as maintenance cost is low.
Claims (2)
1. a battery diaphragm septum permeability testing device, it is characterized in that, this proving installation comprises: air supply system, voltage-stabilizing system, temperature variation testing system, metering system, the output terminal of air supply system is communicated with voltage-stabilizing system, the output terminal of voltage-stabilizing system and temperature variation testing system connectivity, the output terminal of temperature variation testing system is communicated with metering system.
2. according to battery diaphragm septum permeability testing device claimed in claim 1, it is characterized in that, temperature variation testing system by thering is the diaphragm sealing structure of temperature adjustment function, the battery diaphragm of testing forms, the diaphragm sealing structure with temperature adjustment function is provided with: air intake opening, gas outlet, O-ring seal, stainless steel mesh, battery diaphragm, diaphragm seal chamber I, engaging lug I, engaging lug II, diaphragm seal chamber II, bolt, and concrete structure is as follows:
Diaphragm seal chamber I, diaphragm seal chamber II are oppositely arranged by seam and dock and form diaphragm seal chamber, and battery diaphragm is between diaphragm seal chamber I, diaphragm seal chamber II, and the other lining of battery diaphragm is with 50 order～400 order stainless steel mesh; The inner side at relative position place between diaphragm seal chamber I, diaphragm seal chamber II, one end of diaphragm seal chamber I arranges battery diaphragm by O-ring seal, and the inboard of battery diaphragm arranges stainless steel mesh; The outside at relative position place between diaphragm seal chamber I, diaphragm seal chamber II, one end of diaphragm seal chamber I arranges engaging lug I, and the other end of diaphragm seal chamber II arranges engaging lug II, is bolted fixing between engaging lug I and engaging lug II; The other end of diaphragm seal chamber I is provided with air intake opening, and the other end of diaphragm seal chamber II is provided with gas outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420258808.5U CN203811516U (en) | 2014-05-20 | 2014-05-20 | Testing device for air permeability of battery diaphragms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420258808.5U CN203811516U (en) | 2014-05-20 | 2014-05-20 | Testing device for air permeability of battery diaphragms |
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|---|---|
| CN203811516U true CN203811516U (en) | 2014-09-03 |
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|---|---|---|---|
| CN201420258808.5U Expired - Lifetime CN203811516U (en) | 2014-05-20 | 2014-05-20 | Testing device for air permeability of battery diaphragms |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020093A (en) * | 2014-05-20 | 2014-09-03 | 中国科学院金属研究所 | Method and device for measuring air permeability of battery diaphragm |
| CN106979915A (en) * | 2016-01-15 | 2017-07-25 | 张家港康得新光电材料有限公司 | The test device and method of testing of Obstruct membrane vapour lock performance |
| CN106979916A (en) * | 2016-01-15 | 2017-07-25 | 张家港康得新光电材料有限公司 | The test device of water vapor rejection film |
| CN107328703A (en) * | 2017-08-21 | 2017-11-07 | 中国计量科学研究院 | A kind of preparation method of reusable gas permeation rate reference membrane |
| CN111337405A (en) * | 2020-03-20 | 2020-06-26 | 山东伟基炭科技有限公司 | Testing arrangement of graphite material's air permeability |
-
2014
- 2014-05-20 CN CN201420258808.5U patent/CN203811516U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020093A (en) * | 2014-05-20 | 2014-09-03 | 中国科学院金属研究所 | Method and device for measuring air permeability of battery diaphragm |
| CN106979915A (en) * | 2016-01-15 | 2017-07-25 | 张家港康得新光电材料有限公司 | The test device and method of testing of Obstruct membrane vapour lock performance |
| CN106979916A (en) * | 2016-01-15 | 2017-07-25 | 张家港康得新光电材料有限公司 | The test device of water vapor rejection film |
| CN107328703A (en) * | 2017-08-21 | 2017-11-07 | 中国计量科学研究院 | A kind of preparation method of reusable gas permeation rate reference membrane |
| CN111337405A (en) * | 2020-03-20 | 2020-06-26 | 山东伟基炭科技有限公司 | Testing arrangement of graphite material's air permeability |
| CN111337405B (en) * | 2020-03-20 | 2022-12-09 | 山东伟基炭科技有限公司 | Testing arrangement of graphite material's air permeability |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140903 Effective date of abandoning: 20160113 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140903 Effective date of abandoning: 20160113 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |