CN102866092B - Device and method for detecting air permeability of lithium ion battery diaphragm - Google Patents
Device and method for detecting air permeability of lithium ion battery diaphragm Download PDFInfo
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- CN102866092B CN102866092B CN201210310793.8A CN201210310793A CN102866092B CN 102866092 B CN102866092 B CN 102866092B CN 201210310793 A CN201210310793 A CN 201210310793A CN 102866092 B CN102866092 B CN 102866092B
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- shaped pipe
- air permeability
- lithium ion
- ion battery
- barrier film
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- 230000035699 permeability Effects 0.000 title claims abstract description 38
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000004888 barrier function Effects 0.000 claims description 29
- 208000002925 dental caries Diseases 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 6
- 238000009738 saturating Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 8
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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- Hybrid Cells (AREA)
Abstract
The invention discloses a device and a method for detecting the air permeability of a lithium ion battery diaphragm. The device comprises a U-shaped tube and a ventilating device, wherein liquid with a certain height is added in the U-shaped tube; a first air valve and a second air valve are respectively arranged at the upper ends of a left cavity and a right cavity of the U-shaped tube; the ventilating device comprises a spiral sleeve and two sealing washers; a diaphragm to be detected is placed between the two sealing washers and is put into the spiral sleeve, and the spiral sleeve is screwed down; the right cavity of the U-shaped tube is connected with the spiral sleeve; and the air permeability of the diaphragm is the ratio of the volume of air flowing through the diaphragm and the time of the air flowing through the diaphragm to the area of the diaphragm. The device is simple in structure, convenient to measure and low in cost, the air permeability of the lithium ion battery diaphragm can be effectively detected in real time, and the device is beneficial to stability and consistency of diaphragm detection in a production process of ion batteries.
Description
Technical field
The present invention relates to battery technology field, relate in particular to a kind of pick-up unit and method of air permeability of lithium ion battery diaphragm.
Background technology
Barrier film is a kind of crucial starting material in lithium ion battery, and in battery structure, in the middle of both positive and negative polarity, its Main Function is isolation both positive and negative polarity, and as ion, travels to and fro between the passage of both positive and negative polarity.Microcellular structure on barrier film just ion is travelled to and fro between the passage of both positive and negative polarity, and its permeability has been reacted the situation of battery microcellular structure, directly affects the performance of battery.So detect the permeability of barrier film, to lithium ion battery production and design, be very significant.
The air permeability of battery diaphragm has reacted the permeability of barrier film, and the air permeability of battery diaphragm refers to certain and measure under area, certain pressure condition, and a certain amount of air sees through the needed time of barrier film.At present the test of barrier film air permeability is had to ASTM and JIS testing standard, need to buy specific testing apparatus, test process is complicated, and testing expense is high.In Production Process of Lithium Battery, will detect stability and the consistance of barrier film, that will all will detect every batch of supplied materials, and the cost of test is higher.
Summary of the invention
The object of the invention is exactly in order to make up the defect of prior art, and a kind of pick-up unit and method of air permeability of lithium ion battery diaphragm of convenient test simple in structure is provided.
The present invention is achieved by the following technical solutions:
A kind of pick-up unit of air permeability of lithium ion battery diaphragm, include U-shaped pipe and gas permeable devices, the liquid that adds certain altitude in U-shaped pipe, the upper end of left and right two cavitys of U-shaped pipe is respectively equipped with air valve one and air valve two, described gas permeable devices includes bolt sleeve and two packing washers, barrier film to be measured is placed on to two packing washers centres and puts in screw shell and tighten screw shell, U-shaped pipe the right cavity is connected with screw shell.
A detection method that adopts the air permeability of lithium ion battery diaphragm that above-mentioned device carries out, comprises the steps:
(1) air valve one and air valve two are opened, when U-shaped pipe both sides liquid level is equal, recorded the now height h1 of liquid level, now the air pressure P1 in the cavity of U-shaped pipe right side equals atmospheric pressure P0, and the gas volume in the cavity of right side is V1;
(2), close gas check valve two, from U-shaped pipe left side, in cavity, inflate the rise distance of a section of the liquid level in the cavity of U-shaped pipe right side;
(3), close gas check valve one, open air valve two and start timing, when the liquid level on U-shaped pipe both sides is static, the time is t, now, because U-shaped pipe the right after stable communicates with atmosphere, the air pressure P2 in the cavity of U-shaped pipe right side equals atmospheric pressure P0, and liquid level is h2, and gas volume is V2, V2=V1-(h2-h1) * S1, S1 is U-shaped tube chamber sectional area;
(4), according to Boyle law equation P 1 * V1=P2 * (V2+ Δ V), Δ V, for flowing through barrier film gas volume, calculates Δ V=(h2-h1) * S1;
(5), barrier film air permeability is to flow through barrier film gas volume and gas flow is crossed the time of barrier film and the ratio of diaphragm area, calculating barrier film air permeability is (h2-h1) * S1/(t * S2), S2 is diaphragm area.
The pick-up unit of described air permeability of lithium ion battery diaphragm, is characterized in that: the material of described U-shaped pipe is a kind of in glass, organic glass, resin, plastics.
The pick-up unit of described air permeability of lithium ion battery diaphragm, is characterized in that: the liquid in described U-shaped pipe is ethanol or ethyl acetate.
The pick-up unit of described air permeability of lithium ion battery diaphragm, is characterized in that: the diameter of described U-shaped pipe is greater than 6mm.
The detection method of described air permeability of lithium ion battery diaphragm, is characterized in that: control the position of the U-shaped pipe of gas replenishment process the right liquid level in step (2), (h2-h1) is constant, compares the size of the saturating rate of barrier film gas according to time t.
Advantage of the present invention is: the structure of the present invention by U-shaped pipe realizes air permeability of lithium ion battery diaphragm and test, simple in structure, it is convenient to measure, cost is low, and realize air permeability of lithium ion battery diaphragm is tested in real time, effectively detected, be conducive to detect stability and the consistance of barrier film in Production Process of Lithium Battery.
Accompanying drawing explanation
Fig. 1 is original state timer schematic diagram.
Fig. 2 inflates rear device schematic diagram.
Fig. 3 is gas permeable devices enlarged drawing.
Embodiment
As shown in Figure 1, 2, a kind of pick-up unit of air permeability of lithium ion battery diaphragm, include U-shaped pipe 3 and gas permeable devices 4, the liquid that adds certain altitude in U-shaped pipe 3, the upper end of left and right two cavitys of U-shaped pipe 3 is respectively equipped with air valve 1 and air valve 22, described gas permeable devices 4 includes bolt sleeve 6 and two packing washers 7, and barrier film to be measured 5 is placed on to two packing washers 7 centres and puts in screw shell 6 and tighten screw shell 6, and U-shaped pipe 3 the right cavitys are connected with screw shell 6.
A detection method that adopts the air permeability of lithium ion battery diaphragm that above-mentioned device carries out, comprises the steps:
(1) as shown in Figure 1, air valve 1 and air valve 22 are opened, until U-shaped pipe 3 both sides liquid levels, when equal, recorded the now height h1 of liquid level, now the air pressure P1 in U-shaped pipe 3 right side cavitys equals atmospheric pressure P0, and the gas volume in the cavity of right side is V1;
(2), close gas check valve 22, from U-shaped pipe 3 left sides, in cavity, inflate the rise distance of a section of the liquid level in U-shaped pipe 3 right side cavitys;
(3), as shown in Figure 2, close gas check valve 1, open air valve 22 and start timing, when the liquid level on U-shaped pipe 3 both sides is static, the time is t, now, air pressure P2 in U-shaped pipe 3 right side cavitys equals atmospheric pressure P0, and liquid level is h2, and gas volume is V2, V2=V1-(h2-h1) * S1, S1 is that U-shaped pipe 3 cavity cross-section are long-pending;
(4), according to Boyle law equation P 1 * V1=P2 * (V2+ Δ V), Δ V, for flowing through barrier film gas volume, calculates Δ V=(h2-h1) * S1;
(5), barrier film air permeability is to flow through barrier film gas volume and gas flow is crossed the time of barrier film and the ratio of diaphragm area, calculating barrier film air permeability is (h2-h1) * S1/(t * S2), S2 is diaphragm area.
The pick-up unit of described air permeability of lithium ion battery diaphragm, is characterized in that: the material of described U-shaped pipe 3 is a kind of in glass, organic glass, resin, plastics.
The pick-up unit of described air permeability of lithium ion battery diaphragm, is characterized in that: the liquid in described U-shaped pipe 3 is ethanol or ethyl acetate.
The pick-up unit of described air permeability of lithium ion battery diaphragm, is characterized in that: the diameter of described U-shaped pipe 3 is greater than 6mm.
The detection method of described air permeability of lithium ion battery diaphragm, is characterized in that: control the position of the U-shaped pipe 3 the right liquid levels of gas replenishment process in step (2), (h2-h1) is constant, compares the size of the saturating rate of barrier film gas according to time t.
Claims (2)
1. the detection method of the air permeability of lithium ion battery diaphragm that the pick-up unit of an air permeability of lithium ion battery diaphragm carries out, it is characterized in that: described pick-up unit includes U-shaped pipe and gas permeable devices, the liquid that adds certain altitude in U-shaped pipe, the upper end of left and right two cavitys of U-shaped pipe is respectively equipped with air valve one and air valve two, described gas permeable devices includes bolt sleeve and two packing washers, barrier film to be measured is placed on to two packing washers centres and puts in screw shell and tighten screw shell, U-shaped pipe the right cavity is connected with screw shell;
The detection method of the air permeability of lithium ion battery diaphragm that described device carries out, comprises the steps:
(1) air valve one and air valve two are opened, when U-shaped pipe both sides liquid level is equal, recorded the now height h1 of liquid level, now the air pressure P1 in the cavity of U-shaped pipe right side equals atmospheric pressure P0, and the gas volume in the cavity of right side is V1;
(2), close gas check valve two, from U-shaped pipe left side, in cavity, inflate the rise distance of a section of the liquid level in the cavity of U-shaped pipe right side;
(3), close gas check valve one, open air valve two and start timing, when the liquid level on U-shaped pipe both sides is static, time is t, and now, the air pressure P2 in the cavity of U-shaped pipe right side equals atmospheric pressure P0, liquid level is h2, gas volume is V2, V2=V1-(h2-h1) * S1, S1 is U-shaped tube chamber sectional area;
(4), according to Boyle law equation P 1 * V1=P2 * (V2+ Δ V), Δ V, for flowing through barrier film gas volume, calculates Δ V=(h2-h1) * S1;
(5), barrier film air permeability is to flow through barrier film gas volume and gas flow is crossed the time of barrier film and the ratio of diaphragm area, calculating barrier film air permeability is (h2-h1) * S1/(t * S2), S2 is diaphragm area.
2. the detection method of the air permeability of lithium ion battery diaphragm that the pick-up unit of air permeability of lithium ion battery diaphragm according to claim 1 carries out, it is characterized in that: the position of controlling the U-shaped pipe of gas replenishment process the right liquid level in step (2), (h2-h1) is constant, compares the size of the saturating rate of barrier film gas according to time t.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210310793.8A CN102866092B (en) | 2012-08-28 | 2012-08-28 | Device and method for detecting air permeability of lithium ion battery diaphragm |
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| CN201210310793.8A CN102866092B (en) | 2012-08-28 | 2012-08-28 | Device and method for detecting air permeability of lithium ion battery diaphragm |
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| Publication Number | Publication Date |
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| CN102866092A CN102866092A (en) | 2013-01-09 |
| CN102866092B true CN102866092B (en) | 2014-10-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106885764B (en) * | 2015-12-16 | 2019-08-27 | 北京银河巴马生物技术股份有限公司 | A kind of biomembrane anti-permeability detection device and application |
| CN106769777A (en) * | 2017-01-19 | 2017-05-31 | 智能（厦门）传感器有限公司 | The ventilative amount detecting device and detection method of a kind of ventilated membrane |
| 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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| JPH0769245B2 (en) * | 1991-06-20 | 1995-07-26 | 工業技術院長 | Membrane permeability measuring device for radioactive gas |
| CN2546872Y (en) * | 2002-05-23 | 2003-04-23 | 华南农业大学 | Diolame type control release fertilizer film permeability investigating apparatus |
| CN201266632Y (en) * | 2008-09-08 | 2009-07-01 | 深圳市比克电池有限公司 | Test device for battery diaphragm ventilation property |
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Address after: 230011, No. 7 D Road, Yaohai Industrial Park, Hefei, Anhui, China Applicant after: Hefei Guoxuan High-Tech Power Energy Co.,Ltd. Address before: 230011, No. 7 D Road, Yaohai Industrial Park, Hefei, Anhui, China Applicant before: Gotion High-tech Co., Ltd. |
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Address after: 230000 Yaohai Industrial Zone, Hefei New District, Anhui, No. D weft Road, No. 7 Patentee after: Gotion High-tech Co., Ltd. Address before: 230011, No. 7 D Road, Yaohai Industrial Park, Hefei, Anhui, China Patentee before: Hefei Guoxuan High-Tech Power Energy Co.,Ltd. |