CN107064155A - The detection method and device of a kind of lithium ion battery separator - Google Patents
The detection method and device of a kind of lithium ion battery separator Download PDFInfo
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- CN107064155A CN107064155A CN201710142570.8A CN201710142570A CN107064155A CN 107064155 A CN107064155 A CN 107064155A CN 201710142570 A CN201710142570 A CN 201710142570A CN 107064155 A CN107064155 A CN 107064155A
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- basement membrane
- film
- light
- polarizing film
- curtain coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8848—Polarisation of light
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- Health & Medical Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Cell Separators (AREA)
Abstract
This application discloses a kind of detection method of lithium ion battery separator and device.The detection method of the lithium ion battery separator of the application, including irradiating the curtain coating basement membrane that dry method tension produces lithium battery diaphragm using uniform light source, and it is placed in parallel light polarizing film formation light and shade alternating stripes in the rear of curtain coating basement membrane, by observing the light and shade alternating stripes that light polarizing film is formed, judge the orientation of curtain coating basement membrane and be cast the thickness evenness of basement membrane different directions.The detection method of the application, the orientation and thickness that are cast basement membrane are detected in advance using light polarizing film, underproof curtain coating basement membrane is screened out, underproof curtain coating basement membrane is avoided to flow into follow-up production technology, avoid the resource thereby resulted in and cost is wasted, production efficiency and the quality of production are improved, the product disqualification rate caused by being cast basement membrane is reduced.
Description
Technical field
The application is related to lithium ion battery separator detection field, more particularly to a kind of detection side of lithium ion battery separator
Method and device.
Background technology
Chargeable lithium ion secondary cell has the characteristic of high-energy-density, long circulation life, memory-less effect, has peace again
Entirely, the advantages of reliable and energy fast charging and discharging, thus the focus as novel power supply technical research in recent years.Due to lithium-ion electric
Pond is the secondary cell of green pollution-free, meets the big growth requirement of countries nowadays energy environment protection aspect, in all trades and professions
Usage amount increase sharply.It is anti-that current lithium ion battery is not only widely used in daily well known mobile phone, notebook computer, list
The digital electronic goods such as camera, and it is widely used in some high power batteries aspect such as electric car, electric bicycle.
Barrier film is the important feature part of lithium ion battery, and its performance determines the interfacial structure of battery, internal resistance etc., directly
Influence the characteristics such as capacity, the cycle performance of battery.
The barrier film of current commercial lithium-ion batteries is mostly MIcroporous polyolefin film, including polypropylene (abbreviation PP) individual layer is micro-
Pore membrane, polyethylene (abbreviation PE) single layer microporous film, and the multilayer microporous film being combined by PP and PE.Existing polyalkene diaphragm life
Production. art can be divided into two major classes according to dry and wet, while dry method can be subdivided into simple tension technique and biaxial tension work again
Skill.Wherein, in the market using it is most be dry method simple tension technique.
Dry method simple tension technique is the method by producing hard elastic fibre, prepares highly oriented poly- the third of low-crystallinity
Alkene or polyethylene film, then high annealing obtain the oriented film of high-crystallinity.This film first carries out stretching shape at low temperature
Into microdefects such as crazings, defect then is pulled open under high temperature, form the barrier film containing micropore.The technique passes through the hair of decades
Exhibition, highly developed in the U.S., Japan, China also has many lithium battery diaphragm manufacturers to use the technique.
But in dry method simple tension process of industrialization, although technical maturity, equipment is simpler, will not in production process
Produce any environmental pollution, but the requirement to technology controlling and process is very high, production efficiency and product qualification rate are relatively low, this often into
For restriction barrier film, enterprise reduces the key of production cost.
The content of the invention
The purpose of the application is to provide the detection method and device of a kind of new lithium ion battery separator.
To achieve these goals, the application employs following technical scheme：
The one side of the application discloses a kind of detection method of lithium ion battery separator, including is shone using uniform light source
The curtain coating basement membrane that dry method tension produces lithium battery diaphragm is penetrated, and light polarizing film is placed in parallel in the rear of curtain coating basement membrane, light and shade is formed
Alternating stripes, by observing the light and shade alternating stripes that light polarizing film is formed, judge that the orientation of curtain coating basement membrane is different with curtain coating basement membrane
The thickness evenness in direction.
It should be noted that using uniform light source irradiation curtain coating basement membrane, it is equal the purpose is to entirely to be cast basement membrane
Even illuminates, it is to avoid influence to observe result because of light source.Although the application's it is critical that the platelet of curtain coating basement membrane is arranged not
It is very regular, but still with certain orientation texture；Therefore, observed by light polarizing film, it is observed that being cast taking for basement membrane
To.Light and dark striped can be for example observed with the naked eye to produce, while moved along the curtain coating perpendicular to casting films
Direction is observed, and the width of such as light and shade striped is not of uniform size or different widths are very big, then illustrates that the orientation texture of casting films is poor, from
And can determine whether out that the uniformity of casting films is poor.
The detection method of the application, can uniformly detect that filtering is removed to the orientation and thickness for being cast basement membrane in advance
Underproof curtain coating basement membrane, it is to avoid it is flowed into follow-up production technology, improves the quality of production and product qualification rate；Avoid
Resource and cost caused by unqualified curtain coating basement membrane inflow subsequent production are wasted.
It is preferred that, the light polarizing film that the detection method of the application is used is iodine polarizing film, dyestuff system light polarizing film, metal polarisation
At least one of film and polyethylene light polarizing film.
It is furthermore preferred that light polarizing film is iodine polarizing film.Iodine polarizing film is that iodine molecule is mixed into the shape in high polymer material
Into.
It is preferred that, the polarisation film thickness of the application is 10-5000 microns.
It is preferred that, the distance between curtain coating basement membrane and light polarizing film are less than or equal to 8 meters.
It is preferred that, light source is fluorescent lamp or white LED lamp.
It is preferred that, curtain coating basement membrane is polyolefin film.
The detection method of the application is carried out primarily directed to curtain coating basement membrane, and is that make use of curtain coating basement membrane to exist in itself
Certain orientation texture, it will be understood that based on identical invention thinking, the detection method of the application is not only limited in polyolefin
Film.
It is furthermore preferred that polyolefin film be high density poly propylene film, it is low density polypropylene film, density polyethylene film with high, low close
Spend in polyethylene film, or high density poly propylene film, low density polypropylene film, density polyethylene film with high and low density polyethylene films
Two or more composition multilayer complex films.
It is furthermore preferred that the thickness of polyolefin film is 5-50 microns.
The another side of the application discloses a kind of detection means of lithium ion battery separator, including light source and light polarizing film, light
Source is parallelly mounted to the underface of the curtain coating basement membrane of dry method simple tension technique curtain coating process section production, and light polarizing film is parallel to curtain coating
Basement membrane, and it is installed on the surface of curtain coating basement membrane.
It should be noted that the detection means of the application, can enter separately as an independent device to curtain coating basement membrane
Row detection；It can also be incorporated into dry method simple tension system, on-line checking is carried out to curtain coating basement membrane.
It is preferred that, in the detection means of the application, light polarizing film is iodine polarizing film, dyestuff system light polarizing film, metal light polarizing film
At least one of with polyethylene light polarizing film.
It is preferred that, the polarisation film thickness that the detection means of the application is used is 10-5000 micron.
It is preferred that, in the detection means of the application, the installation site distance of light polarizing film is cast being smaller than or waiting for basement membrane
In 8 meters.
It is preferred that, light source is fluorescent lamp or white LED lamp in the detection means of the application.
The application simultaneously to disclose a kind of lithium ion battery separator dry method of the detection means of use the application again unidirectional
Tensioning system.
Due to being using the beneficial effect of above technical scheme, the application：
The detection method of the application, is detected, is screened out in advance using light polarizing film to the orientation and thickness that are cast basement membrane
Underproof curtain coating basement membrane, it is to avoid underproof curtain coating basement membrane is flowed into follow-up production technology, it is to avoid the money thereby resulted in
Source and cost are wasted, and improve production efficiency and the quality of production, reduce the product disqualification rate caused by being cast basement membrane.
Brief description of the drawings
Fig. 1 is the theory structure schematic diagram of light polarizing film in the embodiment of the present application；
Fig. 2 is the structure arrangement schematic diagram of detection means in the embodiment of the present application；
Fig. 3 is the observation result figure of curtain coating basement membrane in the embodiment of the present application.
Embodiment
The applicant has found in substantial amounts of production practices, for the curtain coating basement membrane of dry method simple tension, not specification
Rational detection means.Be cast basement membrane further stretching turn into lithium ion battery separator during, be cast basement membrane orientation and
Thickness directly determines the quality of barrier film, and does not have for being cast the orientation of basement membrane and be included in detection ranks, also without corresponding
Method and apparatus.
Light polarizing film be widely used in modern liquid crystal show product, such as LCD TV, notebook computer, mobile phone, electronic dictionary,
MP3, instrument and meter, projecting apparatus etc., it can also be used to fashion polaroid glasses.Polarisation membrane material is the high molecular polymerization for mixing iodine molecule
Thing, such as polyvinyl alcohol, have asymmetric electron density when being arranged in the same direction due to iodine molecule, therefore to different directions
The absorption coefficient of light that polarizes is different, if the polarised direction of light is vertical with iodine molecule chain long axis direction, polarized light can lead to completely
Cross, otherwise the intensity through light weakens therewith, until it is completely obscured, so iodine molecule long-chain has plays bias, principle well
As shown in Figure 1.The main function of light polarizing film is the natural light for not having deflection polarity can be converted into polarised light, through turning for liquid crystal
To control whether penetrating for light, and then the display effect of generation panel light and shade.
And the curtain coating basement membrane of the application just has certain orientation texture, after light is by being cast basement membrane, then pass through
Light polarizing film, can observe with the naked eye has light and dark striped to produce herein；Simultaneously along the curtain coating fortune perpendicular to casting films
Dynamic direction observation, the width of such as light and shade striped is not of uniform size or different widths are very big, then illustrate the orientation textures of casting films compared with
Difference, so as to judge that the uniformity of casting films is poor.Thus, curtain coating base is then reflected by the uniformity of light and shade striped brightness
The thickness evenness of film.Study and recognize based on more than, propose the detection method and device of the application.The detection method of the application
And device, to lithium ion battery separator dry method simple tension industrialized production, with very useful directive function, using this Shen
Detection method please and device, can produce that consistency of thickness is good, excellent performance battery diaphragm, and can improve battery
Barrier film production efficiency and product qualification rate.
The application is described in further detail below by specific embodiments and the drawings.Following examples are only to the application
It is further described, should not be construed as the limitation to the application.
Embodiment one
The lithium ion battery separator detection means of this example, as shown in Fig. 2 including light source 3 and light polarizing film 1, the parallel peace of light source 3
Loaded on dry method simple tension technique be cast process section production curtain coating basement membrane 2 underface, light polarizing film 1 parallel to curtain coating basement membrane 2,
And it is installed on the surface of curtain coating basement membrane 2；According to shown in Fig. 2, i.e., light source 3 and light polarizing film 1 are separately mounted to be cast the two of basement membrane 2
Individual side.The detection means of this example is directly installed in dry method simple tension system, and on-line checking is carried out to curtain coating basement membrane.
Wherein, light source is fluorescent lamp, it would however also be possible to employ white LED lamp.Light polarizing film can using iodine polarizing film, dyestuff system light polarizing film,
Metal light polarizing film or polyethylene light polarizing film, this example specifically use iodine polarizing film, and the thickness of light polarizing film is usually 10 microns-
5000 microns, this example specifically uses 500 microns of iodine polarizing film.
8 meters are smaller than between light polarizing film and curtain coating basement membrane；It should be noted that between light polarizing film and curtain coating basement membrane
Spacing is too big, and one is that the space taken is big, it is necessary to bigger production site；Two be both away from too far away, easily have optical signal damage
Lose, such as fine particle in air is to the scattering of light so that the light and shade striped presented in light polarizing film is not clear enough, or,
Stronger light source is needed, to ensure the definition of light and shade striped；Therefore, this example is specifically designed between light polarizing film and curtain coating basement membrane
Be spaced about 1 meter.
After the detection means installation of this example, this example is specifically detected to high density poly propylene microporous barrier, in life
During production, light source is uniformly radiated on curtain coating basement membrane, and light is by being cast after basement membrane and light polarizing film, in light polarizing film surface shape
Into light and shade alternating stripes, as shown in figure 3, visually observing formed light and shade alternating stripes, it is seen then that alternating stripes are clear, uniform,
Prove that the curtain coating basement membrane orientation texture of microporous polypropylene membrane prepared by this example is good, at the same time, striped light and shade itself is uniform, bar
Line size, width are consistent, it is seen that the polypropylene microporous film thickness of this example is uniform, can be used in follow-up barrier film production.
Above content is to combine the further description that specific embodiment is made to the application, it is impossible to assert this Shen
Specific implementation please is confined to these explanations.For the application person of an ordinary skill in the technical field, do not taking off
On the premise of from the application design, some simple deduction or replace can also be made, the protection of the application should be all considered as belonging to
Scope.
Claims (10)
1. a kind of detection method of lithium ion battery separator, it is characterised in that：Including irradiating dry method tension using uniform light source
The curtain coating basement membrane of lithium battery diaphragm is produced, and light polarizing film formation light and shade alternating stripes are placed in parallel in the rear of curtain coating basement membrane, is led to
The light and shade alternating stripes that observation light polarizing film is formed are crossed, the orientation for judging curtain coating basement membrane and the thickness for being cast basement membrane different directions are equal
Even property.
2. detection method according to claim 1, it is characterised in that：The light polarizing film is iodine polarizing film, dyestuff system is inclined
At least one of light film, metal light polarizing film and polyethylene light polarizing film.
3. detection method according to claim 1, it is characterised in that：The polarisation film thickness is 10-5000 microns.
4. detection method according to claim 1, it is characterised in that：It is described curtain coating basement membrane and the light polarizing film between away from
From less than or equal to 8 meters.
5. detection method according to claim 1, it is characterised in that：The light source is fluorescent lamp or white LED lamp.
6. detection method according to claim 1, it is characterised in that：The curtain coating basement membrane is polyolefin film；The polyene
Hydrocarbon film is high density poly propylene film, low density polypropylene film, density polyethylene film with high, low density polyethylene films, or high density
In polypropylene screen, low density polypropylene film, density polyethylene film with high and low density polyethylene films two or more composition it is many
Layer composite membrane.
7. detection method according to claim 6, it is characterised in that：The thickness of the polyolefin film is 5-50 microns.
8. a kind of detection means of lithium ion battery separator, it is characterised in that：Including light source and light polarizing film, the source parallel peace
The underface of the curtain coating basement membrane of process section production is cast loaded on dry method simple tension technique, the light polarizing film is parallel to curtain coating base
Film, and it is installed on the surface of curtain coating basement membrane.
9. detection means according to claim 8, it is characterised in that：The light polarizing film is iodine polarizing film, dyestuff system is inclined
At least one of light film, metal light polarizing film and polyethylene light polarizing film；The polarisation film thickness is 10-5000 microns；It is described inclined
The installation site of light film is smaller than or equal to 8 meters apart from curtain coating basement membrane；The light source is fluorescent lamp or white LED lamp.
10. a kind of lithium ion battery separator dry method simple tension system of the detection means described in use claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710142570.8A CN107064155A (en) | 2017-03-10 | 2017-03-10 | The detection method and device of a kind of lithium ion battery separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710142570.8A CN107064155A (en) | 2017-03-10 | 2017-03-10 | The detection method and device of a kind of lithium ion battery separator |
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| CN107064155A true CN107064155A (en) | 2017-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710142570.8A Pending CN107064155A (en) | 2017-03-10 | 2017-03-10 | The detection method and device of a kind of lithium ion battery separator |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1090197A (en) * | 1996-09-11 | 1998-04-10 | Kitsutaka Kogaku Kenkyusho:Kk | Flaw detector for filmy body |
| JP2000081312A (en) * | 1998-07-07 | 2000-03-21 | Nippon Makushisu:Kk | Inspecting method and apparatus for transparent substrate |
| JP2002189125A (en) * | 2000-12-21 | 2002-07-05 | Toray Ind Inc | Polyester film used to be stick with polarizer film |
| CN103487381A (en) * | 2013-09-16 | 2014-01-01 | 达尼特材料科技（芜湖）有限公司 | Membrane uniformity detection method and device |
| CN103698334A (en) * | 2013-10-25 | 2014-04-02 | 明基材料有限公司 | Pin hole flaw detection system for isolated film and detection method thereof |
| CN104899964A (en) * | 2008-04-28 | 2015-09-09 | 伊诺维亚薄膜有限公司 | Method of authenticating a polymer film |
-
2017
- 2017-03-10 CN CN201710142570.8A patent/CN107064155A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1090197A (en) * | 1996-09-11 | 1998-04-10 | Kitsutaka Kogaku Kenkyusho:Kk | Flaw detector for filmy body |
| JP2000081312A (en) * | 1998-07-07 | 2000-03-21 | Nippon Makushisu:Kk | Inspecting method and apparatus for transparent substrate |
| JP2002189125A (en) * | 2000-12-21 | 2002-07-05 | Toray Ind Inc | Polyester film used to be stick with polarizer film |
| CN104899964A (en) * | 2008-04-28 | 2015-09-09 | 伊诺维亚薄膜有限公司 | Method of authenticating a polymer film |
| CN103487381A (en) * | 2013-09-16 | 2014-01-01 | 达尼特材料科技（芜湖）有限公司 | Membrane uniformity detection method and device |
| CN103698334A (en) * | 2013-10-25 | 2014-04-02 | 明基材料有限公司 | Pin hole flaw detection system for isolated film and detection method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 魏巍: "《液晶器件制造工艺技术》", 31 January 2011, 北京：航空工业出版社 * |
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Address after: 518120 No. 8 Binhai Road, Dapeng street, Dapeng New District, Shenzhen, Guangdong, China. Applicant after: Shenzhen Zhongxing new material technology Limited by Share Ltd Address before: 518020 Shenzhen, Guangdong Dapeng New District Dapeng street water head community Zhongxing Xinzhou complete equipment Co., Ltd. 3 plant 102 Applicant before: Shenzhen ZTE Innovation Material Technology Co., Ltd. |
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Application publication date: 20170818 |