CN1749732A - Detecting method and its device for air permeability of lithium ion battery diaphragm - Google Patents
Detecting method and its device for air permeability of lithium ion battery diaphragm Download PDFInfo
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- CN1749732A CN1749732A CN 200510015016 CN200510015016A CN1749732A CN 1749732 A CN1749732 A CN 1749732A CN 200510015016 CN200510015016 CN 200510015016 CN 200510015016 A CN200510015016 A CN 200510015016A CN 1749732 A CN1749732 A CN 1749732A
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- barrier film
- air permeability
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- battery diaphragm
- ion battery
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Abstract
The present invention relates to battery technology. The detection method of air permeability of lithium ion battery diaphragm includes the following steps: fixing the battery diaphragm, applying air pressure on one side of the diaphragm, and measuring pressure drop with time. The corresponding detection device includes air container with sealing diaphragm, valve, pressure meter, and diaphragm fixing and sealing part. The present invention is simple, fast, convenient in operation, high in efficiency, and low in test cost.
Description
Technical field
The invention belongs to the battery technology field, particularly relate to a kind of air permeability of lithium ion battery diaphragm method of testing and device thereof.
Background technology
The air permeability of battery diaphragm is meant under certain condition (pressure, mensuration area) a certain amount of air by the needed time of barrier film, and it is to estimate the important parameter of barrier film to the battery behavior influence.The test to the barrier film air permeability at present has ASTM and JIS testing standard, needs to buy specific testing apparatus, makes the test process complexity, and testing expense is higher relatively.
Summary of the invention
The present invention provides a kind of method and device thereof of simple test air permeability of lithium ion battery diaphragm for solving the problem that prior art exists.
Barrier film is a kind of important starting material that use when making lithium ion battery, and its main effect is to separate both positive and negative polarity, and travels to and fro between the passage of both positive and negative polarity as ion.Microcellular structure on the barrier film these ions is just travelled to and fro between the important channel of both positive and negative polarity, and its permeability can directly have influence on the performance of battery.Therefore, the test of barrier film air permeability is very beneficial for the design and the manufacturing of lithium ion battery.
The objective of the invention is to set up a kind of air permeability of lithium ion battery diaphragm method of testing, the method simply, fast can test the barrier film air permeability at the lithium ion battery initial stage of making.
Air permeability of lithium ion battery diaphragm method of testing of the present invention adopts following technical scheme:
The air permeability of lithium ion battery diaphragm method of testing adopts the ventilative technology of measuring, and is characterized in that battery diaphragm air permeability test technology process comprises: the self-contained battery barrier film applies air pressure in barrier film one side, metering air pressure pressure drop and used time, the air permeability of detection barrier film.
Under the situation of fixing barrier film, barrier film one side is applied certain air pressure, because the micropore that exists on the barrier film, this air pressure can reduce gradually, up to equaling atmospheric pressure.Comparative pressure drops to the used time of termination pressure from original pressure, just the air permeability of this barrier film as can be known.By the pressure drop time of more different barrier films, can their air permeability performance be compared.The pressure drop time is more little, shows that permeability is good more.Whole test process is simple, quick, and data can directly be reacted the permeability of barrier film, have significant practicality.
In whole process, should note: 1, guarantee the proving installation sealing, and seal process can not damage barrier film.2, the original pressure value is unsuitable excessive, in order to avoid the damage barrier film.3, when different barrier films are tested, definite initial gas pressure value should be arranged and stop atmospheric pressure value, Ji Lu time just has comparative sense like this.
Air permeability of lithium ion battery diaphragm method of testing of the present invention can also adopt following technical measures:
Described air permeability of lithium ion battery diaphragm method of testing is characterized in: the original pressure that applies air pressure in barrier film one side is 0.03Mpa-0.5MPa.
Described air permeability of lithium ion battery diaphragm method of testing is characterized in: the termination pressure that applies air pressure in barrier film one side is 0.002Mpa-0.4MPa.
Another object of the present invention provides a kind of simple in structure, easy to operate a kind of air permeability of lithium ion battery diaphragm proving installation.
Air permeability of lithium ion battery diaphragm proving installation of the present invention adopts following technical scheme:
The air permeability of lithium ion battery diaphragm proving installation, comprise gas container, gas container has diaphragm seal, be characterized in that battery diaphragm air permeability proving installation is made up of gas container, valve, pressometer, barrier film fixing seals, gas container is equipped with valve, the turnover of control test gas, pressometer is installed on gas container, measurement gas room pressure, gas container have the barrier film fixing seals, fixing and sealing test barrier film.
Air permeability of lithium ion battery diaphragm proving installation of the present invention can also adopt following technical measures:
Described air permeability of lithium ion battery diaphragm proving installation is characterized in that gas container has two valves, controls test gas input and output gas container and gas container build-in test gas outflow passing through barrier film respectively.
Described air permeability of lithium ion battery diaphragm proving installation is characterized in that pressometer is a gas gauge.
Advantage that the present invention has and good effect:
The invention provides a kind of air permeability of lithium ion battery diaphragm method of testing and device, the method is simple, quick, can be used as a kind of householder method of battery design, can instruct design at the manufacturing initial stage.The air permeability of lithium ion battery diaphragm proving installation, simple in structure, easy to operate, test job efficient height.The present invention does not need specific installation, as long as there is the place of source of the gas to use, has advantages such as test is simple and convenient, testing efficiency is high, and testing expense is low.
Description of drawings
Fig. 1 is an air permeability of lithium ion battery diaphragm proving installation structural representation of the present invention.
Wherein, 1, the 2-gas compartment, 3, the 4-valve, 5-tensimeter, 6-barrier film, 7-O-ring seal, 8-gas container.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, enumerate following example now and be described in detail as follows:
Embodiment 1
With reference to accompanying drawing 1.
The air permeability of lithium ion battery diaphragm proving installation, form by gas container 8, valve 3, valve 4, tensimeter 5, barrier film fixing seals 7, the valve 3 that gas container 8 is equipped with, the input and output gas container 8 of valve 3 control test gas, gas container 8 is equipped with valve 4, gas container 8 is divided into gas compartment 1 and gas compartment 2, and valve 4 control test gas flow out by barrier film 6.Tensimeter 5 is installed on gas container, the measurement gas room pressure, and gas container 8 has barrier film fixing seals 7, fixing and sealing test barrier film 6.
Embodiment 2
With reference to accompanying drawing 1.
The air permeability of lithium ion battery diaphragm method of testing, the technological process that comprises: the seal 7 that battery diaphragm 6 is fixed on gas container 8, apply initial gas pressure in barrier film one side, because the micropore that exists on the barrier film 6, this air pressure can reduce gradually, reduces to termination air pressure up to air pressure, and the First Astronautic Research Institute for Measurement and Test uses the time, by the pressure drop time of more different barrier films, can their air permeability performance be compared and detect.The pressure drop time is more little, shows that permeability is good more.
Concrete test process is as follows:
1, with barrier film 6 smooth be positioned over fixing seals 7 places, seal with O-ring seal.
2, shut-off valve 4, open valve 3, and from valve 3 to chamber 2 air inlets, be the P between 0.04MPa～0.5MPa when tensimeter 5 shows force value
1The time, stop air inlet and shut-off valve 3.
3, open valve 4, chamber 1 and chamber 2 is communicated with, because the air pressure of chamber 1, chamber 2 is greater than barrier film opposite side air pressure, the gas in chamber 1, the chamber 2 can flow to the barrier film opposite side by the micropore of barrier film, when force value is reduced to P between 0.03MPa～0.5MPa
2The time, pick up counting.
4, reduce to P between 0.002MPa～0.4MPa when force value
3The time, stop timing, and write down this time value t.
By the pressure drop time t of more different barrier films, can their air permeability performance be compared.T is more little, shows that permeability is good more.Whole test process is simple, quick, and data can directly be reacted the permeability of barrier film, have significant practicality.
Embodiment 3
Product A, B, the C of three kinds of different trades mark of east combustion barrier film cut into five samples respectively, are numbered A1-A5, B1-B5, C1-C5, utilize the device of embodiment 1, test by embodiment 2 described test processs, decide force value and be respectively 0.04MPa and 0.006MPa, test result is as follows:
| Numbering | Pressure drop time t/s | Numbering | Pressure drop time t/s | Numbering | Pressure drop time t/s |
| A1 | 169 | B1 | 152 | C1 | 103 |
| A2 | 170 | B2 | 148 | C2 | 99 |
| A3 | 178 | B3 | 158 | C3 | 103 |
| A4 | 172 | B4 | 160 | C4 | 100 |
| A5 | 173 | B5 | 151 | C5 | 105 |
| Avg. | 172 | Avg. | 154 | Avg. | 102 |
From above experimental result as can be seen, very approaching with a kind of test value of barrier film, verified the collimation of testing.Compare the test value of three kinds of barrier films, the permeability value standard testing data of A, B, three kinds of barrier films of C are respectively 340sec/100cc, 280sec/100cc, 170sec/100cc.As can be seen, the value of C is less than the value of B, and therefore the value of B, can draw less than the value of A, and aspect permeability, barrier film C is better than B, and barrier film B is better than barrier film A.
Claims (6)
1. air permeability of lithium ion battery diaphragm method of testing, adopt the ventilative technology of measuring, it is characterized in that battery diaphragm air permeability test technology process comprises: the self-contained battery barrier film applies air pressure in barrier film one side, metering air pressure pressure drop and used time, the air permeability of detection barrier film.
2. air permeability of lithium ion battery diaphragm method of testing according to claim 1 is characterized in that: the original pressure that applies air pressure in barrier film one side is 0.03Mpa-0.5MPa.
3. air permeability of lithium ion battery diaphragm method of testing according to claim 1 is characterized in that: the termination pressure that applies air pressure in barrier film one side is 0.002Mpa-0.4MPa.
4. air permeability of lithium ion battery diaphragm proving installation, comprise gas container, gas container has diaphragm seal, it is characterized in that: battery diaphragm air permeability proving installation is made up of gas container, valve, pressometer, barrier film fixing seals, and gas container is equipped with valve, the turnover of control test gas, pressometer is installed on gas container, measurement gas room pressure, gas container have the barrier film fixing seals, fixing and sealing test barrier film.
5. air permeability of lithium ion battery diaphragm proving installation according to claim 4 is characterized in that: gas container has two valves, controls test gas input and output gas container and gas container build-in test gas outflow passing through barrier film respectively.
6. air permeability of lithium ion battery diaphragm proving installation according to claim 4 is characterized in that: pressometer is a gas gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510015016 CN1749732A (en) | 2005-09-08 | 2005-09-08 | Detecting method and its device for air permeability of lithium ion battery diaphragm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510015016 CN1749732A (en) | 2005-09-08 | 2005-09-08 | Detecting method and its device for air permeability of lithium ion battery diaphragm |
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| CN1749732A true CN1749732A (en) | 2006-03-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335929A (en) * | 2013-06-08 | 2013-10-02 | 厦门大学 | Detection method of porous diaphragm of lithium ion battery |
| CN103760621A (en) * | 2014-01-14 | 2014-04-30 | 重庆工商职业学院 | Diaphragm micro-hole detection device and control system thereof |
| 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 |
| CN107727548A (en) * | 2017-09-21 | 2018-02-23 | 东莞市创明电池技术有限公司 | Barrier film septum permeability testing device and barrier film air permeability method of testing |
| CN107843532A (en) * | 2016-09-21 | 2018-03-27 | 希悦尔（中国）有限公司 | A kind of film micropore ventilation property test device |
-
2005
- 2005-09-08 CN CN 200510015016 patent/CN1749732A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335929A (en) * | 2013-06-08 | 2013-10-02 | 厦门大学 | Detection method of porous diaphragm of lithium ion battery |
| CN103760621A (en) * | 2014-01-14 | 2014-04-30 | 重庆工商职业学院 | Diaphragm micro-hole detection device and control system thereof |
| 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 |
| CN107843532A (en) * | 2016-09-21 | 2018-03-27 | 希悦尔（中国）有限公司 | A kind of film micropore ventilation property test device |
| CN107727548A (en) * | 2017-09-21 | 2018-02-23 | 东莞市创明电池技术有限公司 | Barrier film septum permeability testing device and barrier film air permeability method of testing |
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