CN105319139A - Diaphragm puncture strength testing device and method - Google Patents
Diaphragm puncture strength testing device and method Download PDFInfo
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- CN105319139A CN105319139A CN201510859203.0A CN201510859203A CN105319139A CN 105319139 A CN105319139 A CN 105319139A CN 201510859203 A CN201510859203 A CN 201510859203A CN 105319139 A CN105319139 A CN 105319139A
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- proving installation
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Abstract
A diaphragm is one of important components of a battery, and the puncture strength is an important index of the diaphragm. However, diaphragms with different thicknesses and different specifications have different performances, and many manufactures require effective tests on the puncture strength of the diaphragms. Short circuit is caused by anode and cathode contact generated because the diaphragms are possibly punctured by polar plates on electrodes and dust in the battery production process, and furthermore safety accidents are caused. The puncture strength can represent the particle puncture resistance and burr puncture resistance of the diaphragms. In order to solve the problem, the invention mainly aims at providing a lithium ion battery diaphragm puncture strength testing device and method, so that the puncture strength of a lithium ion battery diaphragm can be conveniently and rapidly tested, and the reliable basis is provided when various battery manufactures select diaphragms.
Description
Technical field
The invention belongs to macromolecule member material field tests, particularly relate to a kind of puncture resistant aptitude tests devices and methods therefor for lithium ion battery micro-pore septum material.
Technical background
Because it is high that lithium ion battery has energy density, have extended cycle life, the advantages such as self-discharge rate is little, environmental protection, lithium ion battery is widely used in notebook computer, mobile phone, the consumption electronic products such as video camera.The main material of current lithium ion battery separator is porous polyolefin membrane, comprises tygon (PE) or polypropylene (PP) etc., generally adopts the barrier film of different size according to application, as wet method or the dry method barrier film of individual layer, bilayer and three layers.Battery diaphragm ionic conduction ability be directly connected to the overall performance of battery; the effect of its isolation both positive and negative polarity makes the rising of battery energy Limited Current when overcharging or internal temperature raises; prevent battery generation thermal runaway from setting off an explosion; there is the self-closing protective effect of micropore, battery user and equipment are played to the effect of safeguard protection.
Barrier film is one of important component part of battery, and puncture strength is an important indicator of barrier film.And the membrane properties of different-thickness different size is different, a lot of producer all requires effectively to test the puncture strength of barrier film.In cell fabrication processes, the pole plate on electrode and dust likely pierce through barrier film, and cause both positive and negative polarity to contact and short circuit, and then cause security incident.The ability that puncture strength can characterize the resistance to particle of barrier film, burr pierces through.
Summary of the invention
For the problems referred to above, fundamental purpose of the present invention is for providing a kind of lithium ion battery separator puncture strength proving installation and method of testing, thus realize the puncture strength conveniently testing out lithium ion battery separator, for each cell production companies is selected to provide reliable basis during barrier film.
Inventive concept: adopt air-actuated jaw switch, utilizes microcomputer controlled electronic universal tester to detect the punctured resistance of barrier film.So-called punctured resistance refers to the quality being applied to and given aciculiform thing being used for exposing barrier film sample, represents with it the trend that barrier film is short-circuited in assembling process, because barrier film is sandwiched between rough positive and negative plate, needs to bear very large pressure.In order to prevent short circuit, barrier film must possess certain puncture strength.
In the present invention, indication barrier film comprises the macromolecule micro-pore septums such as PE, PP, PP-PE, nonwoven fabrics, polyimide, and its thickness is between 5um ~ 60um.
Technical solution of the present invention:
A kind of lithium ion battery separator puncture strength proving installation, comprise puncture needle 1, upper fixture 2, lower clamp 3, base for supporting 4, and upper fixture 2 and lower clamp 3 central authorities are provided with pin hole 5 in correspondence with each other, wherein, lower clamp 3 is fixed on base for supporting 4, upper fixture 2 and the movable connection of lower clamp 3, and puncture needle 1 can pass through pin hole 5.
Described movable connection comprises screw, snap close, the mode such as pneumatic connect.Preferably, pneumatic connection, further comprises pneumatic switch 6.Open general supply, start computer, then call through test electromechanical source.Turned clockwise by pneumatic switch, fixture is opened, and the barrier film cut is put into fixture, is rotated counterclockwise by starting switch, and fixture is closed, and starts test.Adopt air-actuated jaw switch, control clamp barrier film, compare screw means and more operate more simple and convenient, and barrier film stressed evenly, with the laminating better effects if of fixture.
Preferably, described upper fixture and lower clamp are selected from rectangular parallelepiped, square or right cylinder, are preferably right cylinder.
Preferably, described cylindrical diameter is Ф
1=80 ~ 100mm.
Preferably, the diameter of described pin hole 5 is Ф
2=10 ~ 20mm.
Preferably, the round and smooth and impulse-free robustness of the syringe needle of described puncture needle 1.
Preferably, the surfacing of described upper fixture and lower clamp is smooth, and roughness Ra < 0.8.If chucking surface has particle, easily make barrier film pierce through, affect test accuracy.
Preferentially, above-mentioned puncture needle specification: Ф=0.5 ~ 2.0mm, upper lower clamp specification: Ф
1=100mm, Ф
2=20mm.
A kind of lithium ion battery separator puncture strength proving installation method of testing, comprises the following steps:
1, battery diaphragm sample is cut;
2, arrange the test parameter of needs, puncture speed is 20 ~ 500mm/min, and setting displacement is 10 ~ 50mm;
3, be put in smooth for barrier film sample in the middle of fixture, and barrier film and fixture fit tightly;
4, allow puncture needle at the uniform velocity glide downwards, barrier film is pierced through.
Preferably, along barrier film longitudinal direction, according to above-mentioned steps duplicate measurements, then remove maximin, get arithmetic average as final sample puncture strength data.
Advantage of the present invention is:
(1) when the present invention adopts air-actuated jaw switch, control clamp barrier film, compare screw means and more operate more simple and convenient, and barrier film stressed evenly, with the laminating better effects if of fixture;
(2) the present invention is easy and simple to handle, equipment is simple, testing staff can independent operation, detect reproducible, testing efficiency is high, compared with the puncture strength numerical value testing out lithium ion battery separator of accurate quick, can be applicable to the testing process of the lithium ion battery separator material of various different size, applied range, for producer provides foundation accurately.
Accompanying drawing explanation
Fig. 1 puncture strength proving installation screw fixed structure schematic diagram;
Fig. 2 puncture strength proving installation snap close fixed sturcture schematic diagram;
The pneumatic fixed sturcture schematic diagram of Fig. 3 puncture strength proving installation;
Wherein, 1 puncture needle; Fixture on 2; 3 lower clamps; 4, base for supporting; 5 pin holes; 6 pneumatic switchs; 7 screws; 8 snap closes.
Specific embodiment
Embodiment 1
(1) sample is cut growth about 1000mm, the size of wide 35 ~ 60mm;
(2) edit diaphragm puncture strength test experimental program, the test parameter of needs is set, puncture speed 20 ~ 500mm/min, setting shift value 10 ~ 50mm.
(3) be put in the middle of fixture by smooth for barrier film, guarantee that barrier film and fixture fit tightly.
(4) allow puncture needle at the uniform velocity glide downwards, barrier film is pierced through.
(5) along barrier film longitudinal direction, according to above-mentioned steps duplicate measurements, then remove maximin, get 3 data arithmetic average as final sample puncture strength data.
Embodiment 2
The invention provides a kind of lithium ion battery separator puncture strength method of testing, the MEMBRANEA sample of the present embodiment to 16umPP material is tested, and concrete operation step is as follows:
(1) 1,500mm*900mm barrier film is cut;
(2) open general supply, start computer, then call through test electromechanical source;
(3) dextrorotation is taken offence dynamic clamp switch, and upper fixture is upwards opened;
(4) sample is clipped by smooth for the barrier film middle also turn air-actuated jaw of fixture that is put in, the test hurdle of software is reset;
(5) moving beam is to appropriate location (be 40.0mm to back-up ring displacement), adjusts spacing back-up ring position (first time test needs to regulate);
(6) counterclockwise turn air-actuated jaw switch, upper fixture is closed downwards, fits tightly with lower clamp, starts test;
(7) viewing test process, barrier film is punctured rear displacement transducer and automatically returns car, repeats (4)-(7) step, measures collinear 5 points, obtain the data of diaphragm puncture intensity;
(8) data processing: remove minimax 2 value, get the arithmetic average of residue 3 values as final diaphragm puncture intensity data;
Table 132umPP material diaphragm puncture strength values/g
| 624.9 | 632.1 | 642.2 | 634.0 | 629.4 |
Remove each 2 values of minimax, its arithmetic average is: 631.8g.
Embodiment 3
On upper routine basis, then random selecting one volume thickness is the PP material barrier film of 32um, its puncture strength numerical value of same method repeated test:
Table 232umPP material diaphragm puncture strength values/g
| 667.6 | 642.3 | 647.2 | 627.7 | 636.8 |
Remove each 2 values of minimax, its arithmetic average is: 642.1g.
Embodiment 4
Choose the PP material barrier film that a volume thickness is 25um, its puncture strength numerical value of same method repeated test:
Table 325umPP material diaphragm puncture strength values/g
| 523.5 | 505.2 | 519.9 | 521.8 | 513.4 |
Remove each 2 values of minimax, its arithmetic average is: 518.4g.
The foregoing is only preferred embodiment of the present invention, be in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.All any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a lithium ion battery separator puncture strength proving installation, comprise puncture needle (1), upper fixture (2), lower clamp (3), base for supporting (4), and upper fixture (2) and lower clamp (3) central authorities are provided with pin hole (5) in correspondence with each other, wherein, described lower clamp (3) is fixed on base for supporting (4), upper fixture (2) and lower clamp (3) movable connection, described puncture needle (1) can pass pin hole (5).
2. proving installation according to claim 1, it is characterized in that, described movable connection comprises screw, snap close or pneumatic connection.
3. proving installation according to claim 1, it is characterized in that, described upper fixture and lower clamp are selected from the one in rectangular parallelepiped, square or right cylinder.
4. proving installation according to claim 1, it is characterized in that, described upper fixture and lower clamp are preferably right cylinder.
5. proving installation according to claim 3 or 4, is characterized in that, described cylindrical diameter is Ф
1=80 ~ 100mm.
6. proving installation according to the arbitrary claim of claim 1-4, is characterized in that, the diameter of described pin hole (5) is Ф
2=10 ~ 20mm.
7. proving installation according to claim 1, is characterized in that, the round and smooth and impulse-free robustness of the syringe needle of described puncture needle (1).
8. proving installation according to the arbitrary claim of claim 1,3 or 4, it is characterized in that, the surfacing of described upper fixture and lower clamp is smooth, and roughness Ra < 0.8.
9. a lithium ion battery separator puncture strength proving installation method of testing, comprises the following steps:
(1) battery diaphragm sample is cut;
(2) arrange test parameter, puncture speed is 20 ~ 500mm/min, and setting displacement is 10 ~ 50mm;
(3) be put in smooth for barrier film sample in the middle of fixture, and barrier film and fixture fit tightly;
(4) allow puncture needle at the uniform velocity glide downwards, barrier film is pierced through.
10. method of testing according to claim 9, it is characterized in that, further comprise step (5) along barrier film longitudinal direction, according to above-mentioned steps duplicate measurements, then remove maximin, get arithmetic average as final sample puncture strength data.
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| CN201510859203.0A CN105319139A (en) | 2015-11-30 | 2015-11-30 | Diaphragm puncture strength testing device and method |
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| CN201510859203.0A CN105319139A (en) | 2015-11-30 | 2015-11-30 | Diaphragm puncture strength testing device and method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973691A (en) * | 2016-06-20 | 2016-09-28 | 天能电池集团有限公司 | Detection method for puncture resistance performance of lead storage battery separator as well as special clamp |
| CN106199453A (en) * | 2016-08-31 | 2016-12-07 | 华南理工大学 | A kind of cylindrical battery lancing test fixture |
| CN106706428A (en) * | 2017-01-18 | 2017-05-24 | 江苏海四达电源股份有限公司 | Method for testing puncture resistance of aluminum foil |
| CN106840923A (en) * | 2017-01-18 | 2017-06-13 | 江苏海四达电源股份有限公司 | The verifying attachment of aluminium foil puncture resistance |
| CN108627387A (en) * | 2018-06-28 | 2018-10-09 | 桑德集团有限公司 | A kind of test method of battery diaphragm puncture resistant ability and test combine the unit |
| CN109187172A (en) * | 2018-06-28 | 2019-01-11 | 合肥国轩高科动力能源有限公司 | One kind is for detecting diaphragm puncture intensity device and test method |
| CN110274815A (en) * | 2019-05-06 | 2019-09-24 | 中国汽车技术研究中心有限公司 | A kind of analysis method of inside lithium ion cell construction machine intensity |
| CN110926966A (en) * | 2019-12-13 | 2020-03-27 | 国联汽车动力电池研究院有限责任公司 | Method for detecting safety of lithium ion battery diaphragm |
| CN112525464A (en) * | 2020-11-20 | 2021-03-19 | 汕尾天贸新能源科技有限公司 | Test method for maintaining constant dyne value of surface of aluminum plastic film after battery processing |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973691A (en) * | 2016-06-20 | 2016-09-28 | 天能电池集团有限公司 | Detection method for puncture resistance performance of lead storage battery separator as well as special clamp |
| CN105973691B (en) * | 2016-06-20 | 2019-04-30 | 天能电池集团有限公司 | A kind of lead storage battery partition anti-puncture method for testing performance and special fixture |
| CN106199453A (en) * | 2016-08-31 | 2016-12-07 | 华南理工大学 | A kind of cylindrical battery lancing test fixture |
| CN106706428A (en) * | 2017-01-18 | 2017-05-24 | 江苏海四达电源股份有限公司 | Method for testing puncture resistance of aluminum foil |
| CN106840923A (en) * | 2017-01-18 | 2017-06-13 | 江苏海四达电源股份有限公司 | The verifying attachment of aluminium foil puncture resistance |
| CN108627387A (en) * | 2018-06-28 | 2018-10-09 | 桑德集团有限公司 | A kind of test method of battery diaphragm puncture resistant ability and test combine the unit |
| CN109187172A (en) * | 2018-06-28 | 2019-01-11 | 合肥国轩高科动力能源有限公司 | One kind is for detecting diaphragm puncture intensity device and test method |
| CN108627387B (en) * | 2018-06-28 | 2020-12-04 | 桑顿新能源科技有限公司 | Method and combined device for testing puncture resistance of battery diaphragm |
| CN110274815A (en) * | 2019-05-06 | 2019-09-24 | 中国汽车技术研究中心有限公司 | A kind of analysis method of inside lithium ion cell construction machine intensity |
| CN110926966A (en) * | 2019-12-13 | 2020-03-27 | 国联汽车动力电池研究院有限责任公司 | Method for detecting safety of lithium ion battery diaphragm |
| CN112525464A (en) * | 2020-11-20 | 2021-03-19 | 汕尾天贸新能源科技有限公司 | Test method for maintaining constant dyne value of surface of aluminum plastic film after battery processing |
| CN112525464B (en) * | 2020-11-20 | 2024-02-20 | 汕尾天贸新能源科技有限公司 | Test method for maintaining unchanged surface dyne value of aluminum-plastic film after battery processing |
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Application publication date: 20160210 |