CN105424706A - Inspection method for external film used for electrochemical equipment - Google Patents
Inspection method for external film used for electrochemical equipment Download PDFInfo
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- CN105424706A CN105424706A CN201510578838.3A CN201510578838A CN105424706A CN 105424706 A CN105424706 A CN 105424706A CN 201510578838 A CN201510578838 A CN 201510578838A CN 105424706 A CN105424706 A CN 105424706A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
An inspection method for an external film used for electrochemical equipment comprises: a spark discharge process of generating spark marks caused by defects occurring on the external film (1A) on a surface of the external film (1A) consisting of multiple layers of laminating films; and a detection process of detecting the spark marks.
Description
Technical field
The present invention relates to electrochemical apparatus (example: lithium rechargeable battery, double layer capacitor) inspection method of exterior film and the manufacture method of exterior film.
Background technology
As electrochemical apparatus, such as, in lithium rechargeable battery, comprise electrode (collector body), electrolyte (electrolytic solution) battery key element storage enclose in bag-shaped or container-like exterior body.The exterior film being used as the exterior material forming exterior body is generally formed by the laminated film with multilayer.For this exterior film, require to have relative to gas (comprising water vapor), liquid etc. higher barrier.If there is the defects such as pin hole in exterior film, can impair barrier, so check whether that existing defects is important to exterior film.
Although be not electrochemical apparatus exterior film but the inspection method of pin hole to food packaging seal, patent No. 3643400 publication (patent documentation 1) openly can method as follows: by applying voltage between pair of electrodes, detect the flowing whether having discharge current at the part place being configured at pin hole existing in two interelectrode seals, check pin hole thus.
Patent documentation 1: patent No. 3643400 publication
Summary of the invention
The problem that invention will solve
But, when carrying out the inspection of pin hole by the presence or absence of discharge current as above-mentioned known inspection method, be not easy the position of specific pin hole.
The present invention is the invention completed in view of above-mentioned technical background, and its object is to provide can the inspection method of electrochemical apparatus exterior film of position of the defect such as easy specific pin hole and the manufacture method of exterior film.
The present invention other object and advantage illustrated by following preferred implementation.
For the means of dealing with problems
The invention provides following means.
An inspection method for electrochemical apparatus exterior film, wherein, comprises:
Spark discharge operation, makes the surface of the exterior film formed by the laminated film with multilayer produce the electric spark trace caused by the defect being present in described exterior film; With
Detect operation, detect described electric spark trace.
The inspection method of the electrochemical apparatus exterior film according to preceding paragraph 1, wherein,
In described detection operation, based on the surface being taken described exterior film by filming apparatus and the shooting image obtained detects described electric spark trace.
The inspection method of the electrochemical apparatus exterior film according to preceding paragraph 1, wherein,
Described exterior film is rectangular film,
In described spark discharge operation, while the mode between the pair of electrodes making described exterior film be possessed by spark discharge device with described exterior film is relative to the relative movement on the length direction of described exterior film of described pair of electrodes, while apply spark discharge voltage between described pair of electrodes, described electric spark trace is produced thus on the surface of described exterior film
In described detection operation,
The amount of movement of the described exterior film that move is measured by amount of movement tester, and based on the surface being taken the described exterior film that move by filming apparatus and the shooting image obtained detects described electric spark trace,
And then, based on the detection moment of the described electric spark trace of described filming apparatus and the amount of movement of described exterior film that measured to by described amount of movement tester, detect the position of the described electric spark trace on the surface of described exterior film.
The inspection method of the electrochemical apparatus exterior film according to preceding paragraph 3, wherein,
Described pair of electrodes is left in parallel with each other and is configured to relative shape, and the side in described pair of electrodes is the electrode of ground connection, and the opposing party is earth-free inspection electrode,
In described spark discharge operation, described spark discharge electricity consumption is installed with and is decided to be DC voltage 1.3 ~ 2.7kV, be set as 1 ~ 50mm by from described inspection electrode to the distance of described exterior film, the translational speed of exterior film is set as 10 ~ 200m/min, make described exterior film relative movement.
The inspection method of the electrochemical apparatus exterior film according to any one of preceding paragraph 1 to 4, wherein,
In described detection operation, light when also producing based on described electric spark trace and at least one party of sound, detect and there is electric spark trace on the surface of described exterior film.
The inspection method of the electrochemical apparatus exterior film according to any one of preceding paragraph 1 to 5, wherein,
Described exterior film at least has metal level and resin bed as described multilayer.
A manufacture method for electrochemical apparatus exterior film, comprises the operation being checked exterior film by the inspection method of the electrochemical apparatus exterior film according to any one of preceding paragraph 1 to 6.
Invention effect
The present invention plays following effect.
According to preceding paragraph [1], not detect the defect self being present in exterior film, but detect the electric spark trace being exaggerated size because of the spark discharge produced in the part of defect, so easily can detect electric spark trace by the eye, filming apparatus etc. of examinant.Therefore, it is possible to the position of defect on the surface of easily specific exterior film.
In preceding paragraph [2], the shooting image obtained based on the surface by filming apparatus shooting exterior film detects electric spark trace, thus can easily and reliably carry out the detection of electric spark trace, thus can the position of defect on the surface of easily and reliably specific exterior film.
In preceding paragraph [3], based on the reason same with described [2], can easily and reliably carry out the detection of electric spark trace.And then, can check rectangular exterior film workability highland.
And, based on the detection moment of the electric spark trace of filming apparatus and the amount of movement of exterior film that measured to by amount of movement tester, detect the position of the electric spark trace on the surface of exterior film, so can the position of defect on the surface of more easily and more reliably specific exterior film.
In preceding paragraph [4], electric spark trace can be made reliably to produce.
In preceding paragraph [5], can detect more reliably and there is electric spark trace on the surface of exterior film.
In preceding paragraph [6], when exterior film at least has metal level and resin bed, also can produce electric spark trace on the surface of exterior film, can the position of defect on the surface of easily specific exterior film.
In preceding paragraph [7], the defect that can obtain pin hole etc. does not exist or considerably less exterior film.
Accompanying drawing explanation
Fig. 1 checks that the state of midway illustrates the summary side view of the testing fixture of the electrochemical apparatus exterior film of one embodiment of the present invention.
Fig. 2 is the summary amplification view of the exterior film of the 1st embodiment.
Fig. 3 illustrates that the surface in the exterior film of the 1st embodiment creates the summary enlarged drawing on the surface of the exterior film of the state of electric spark trace.
Fig. 4 illustrates that the exterior film at the 1st embodiment exists the summary amplification view of the state of other defect.
Fig. 5 is the summary amplification view of the exterior film of the 2nd embodiment.
Fig. 6 is the summary amplification view of the exterior film of the 3rd embodiment.
Fig. 7 is the summary amplification view of the exterior film of the 4th embodiment.
Embodiment
Then, referring to accompanying drawing, one embodiment of the present invention is described.In addition, in the present embodiment, the statement of aluminium uses with the meaning comprising the both sides of pure aluminum and its alloy.
In FIG, " 10 " are the testing fixtures of the electrochemical apparatus exterior film of one embodiment of the present invention." 1A " is the exterior film of the 1st embodiment checked by the testing fixture 10 of present embodiment.
Exterior film 1A is the film as the rectangular band shape forming the exterior material that the exterior body of storage inclosure as the lithium rechargeable battery key element of electrochemical apparatus key element uses.For exterior film 1A, require to have gas (comprising water vapor), liquid etc. higher barrier.
As shown in Figure 2, exterior film 1A is formed by the laminated film with multilayer, is namely the film of multiple folded integration layer by layer and formation.A concrete structure of exterior film 1A is such as shown below.
Exterior film 1A have be configured in battery key element side hot adhesion (thermoplasticity) resin bed as internal layer 2A (example: polyolefin layer), as the metal level (example: aluminium foil, stainless steel foil, nickel foil, Copper Foil, titanium foil) of middle layer 3A and the 1st resin bed as outer 4A, also there is the 2nd resin bed as outermost layer 5A in the outside being configured in outer 4A.In addition, these layer of 2A, 3A, 4A, 5A are configured to layered laminate, and internal layer 2A and middle layer 3A is bondd by marginal cementing agent 6, middle layer 3A and outer 4A is bondd by marginal cementing agent 6, outer 4A and outermost layer 5A is bondd by marginal cementing agent 6, thus, these layer of stacked integration of 2A, 3A, 4A, 5A.
In the exterior film 1A of this 1st embodiment, internal layer 2A is such as specifically tensionless winkler foundation polypropylene (CPP) rete.Middle layer 3A is such as specifically aluminium (Al) layers of foil.Outer 4A is such as specifically biaxial stretch-formed nylon (ONy) rete.Outermost layer 5A is such as specifically biaxial stretch-formed polyethylene terephthalate (PET) rete.
The width of exterior film 1A is certain on the length direction of exterior film 1A, such as, be 10 ~ 2000mm.The length of exterior film 1A is such as 10 ~ 25000mm.The thickness of exterior film 1A is such as 30 ~ 500 μm.The thickness of internal layer 2A is such as 10 ~ 100 μm, and the thickness of middle layer 3A is such as 7 ~ 120 μm, and the thickness of outer 4A is such as 10 ~ 40 μm, and the thickness of outermost layer 5A is such as 2 ~ 40 μm.The thickness of each cementing agent 6 is such as 0.1 ~ 10 μm.
As shown in Figure 1, the testing fixture 10 of present embodiment comprises spark discharge unit 11, detecting unit 20 etc.
Spark discharge unit 11 is the devices of the electric spark trace (describing in detail, is spark discharge trace) 8 surface of exterior film 1A being produced caused by the defect 7 being present in exterior film 1A, possesses spark discharge device 12, mobile unit 16 etc.
Be present in the defect 7 of exterior film 1A, such as with pin hole 7a as shown in Figure 2 for representative, in addition, the tiny flaws such as white point (fisheye), the foreign matter 7b (foreign matter be mixed in exterior film 1A) that exists in exterior film 1A as shown in Figure 4 can also be enumerated.In fig. 2, pin hole 7a exterior film 1A outermost layer 5A throughout its thickness direction integrally extension and exist.These defects 7 are small, and surface that is most from the face side of exterior film 1A observable defect 7 outward appearance and exterior film 1A has almost no change, so be difficult to utilize the eye of examinant to check these defects 7.
Spark discharge device 12 possesses the spark discharge electrode 13,14 and high-voltage power supply 15 etc. of pair of plate-shaped etc., the spark discharge electrode 13,14 of pair of plate-shaped etc. leaves in parallel with each other and is configured to flatly in relative shape, and high-voltage power supply 15 applies spark discharge voltage between two electrodes 13,14.A side in two electrodes 13,14 is the ground-electrode 14 of ground connection, and the opposing party is the inspection electrode 13 not having ground connection.In the present embodiment, such as, ground-electrode 14 throughout the state being integrally configured to transversal exterior film 1A of the Width of exterior film 1A, checks electrode 13 in the upside of exterior film 1A throughout the state being integrally configured to transversal exterior film 1A of the Width of exterior film 1A in the downside of exterior film 1A.
As shown in Figure 3, the electric spark trace 8 produced on the surface of exterior film 1A by spark discharge unit 11, larger than the defect 7 produced before spark discharge on the surface of exterior film 1A, and local discolouration is black etc.Thus, electric spark trace 8 can easily be checked by detecting unit 20 (filming apparatus 22) described later, and then become can than the eye examination be easier to by examinant.The size of such as, electric spark trace 8 on the surface of exterior film 1A is roughly diameter 0.1 ~ 4.0mm, and this is the size of roughly 2 times of the size of the defect 7 produced before spark discharge.
Mobile unit 16 makes exterior film 1A relatively move on the length direction of exterior film 1A at a predetermined velocity relative to two electrodes 13,14 with exterior film 1A by the mode in the roughly centre position between two electrodes 13,14.In the present embodiment, the allocation position of two electrodes 13,14 is fixed, and mobile unit 16 is configured to become and each electrode 13,14 parallel and exterior film 1A and the discontiguous mode of each electrode 13,14 make exterior film 1A move in their length direction with exterior film 1A.
And then, mobile unit 16 as make exterior film 1A as described above movement drive source and possess outlet roller 17 and take up roll 18 etc.Exterior film 1A is rolled into roll at outlet roller 17.Further, the exterior film 1A sent from outlet roller 17 with predetermined translational speed successively by between two electrodes 13,14 and detecting unit 20 and be wound into roll at take up roll 18.
Detecting unit 20 checks electric spark trace 8, possesses amount of movement tester 21, filming apparatus 22, resolver 23 etc.
Amount of movement tester 21 measures by mobile unit 16 and the amount of movement of the exterior film 1A of movement.In the present embodiment, yardage etc. is used as amount of movement tester 21.Further, amount of movement tester 21 is configured in the moving direction downstream of the exterior film 1A of the allocation position of two electrodes 13,14, and then its allocation position is fixing on the moving direction of exterior film 1A.
Filming apparatus 22 is taken by mobile unit 16 and the surface of the exterior film 1A of movement, in the present embodiment, uses CCD camera etc. as filming apparatus 22.Further, filming apparatus 22 is configured in the moving direction downstream of the exterior film 1A of the allocation position of two electrodes 13,14 and near the upstream side of amount of movement tester 21, and then its allocation position is fixing on the moving direction of exterior film 1A.
Filming apparatus 22 also possesses a pair the 1st filming apparatus 22a and the 2nd filming apparatus 22b that are configured to relative shape in the thickness direction both sides (i.e. the both sides up and down of exterior film 1A) of exterior film 1A.Each filming apparatus 22a, 22b can take the entirety of the Width on the surface of the correspondence of the exterior film 1A of the camera site by each filming apparatus 22a, 22b.
On the surface of the thickness direction both sides of the 1st filming apparatus (filming apparatus of upside) 22a shooting exterior film 1A, electric spark trace 8 is detected on the surface (i.e. upper surface) of a side.Electric spark trace 8 is detected on the surface (i.e. lower surface) that 2nd filming apparatus (filming apparatus of downside) 22b takes exterior film 1A the opposing party.
Resolver 23 has the computing machine etc. being provided with predetermined analysis program, and the shooting image that computer analyzing is taken by each filming apparatus 22a, 22b and obtained is to detect electric spark trace 8.And then each image and analysis result and shooting moment taken is stored in storage part (not shown) explicitly.
And, detecting unit 20 is configured to when detecting electric spark trace 8 by filming apparatus 22 (resolver 23), based on this detection moment and the amount of movement of exterior film 1A that measured to by amount of movement tester 21, calculate and detect the position that two of exterior film 1A detects the electric spark trace 8 on the surface of electric spark trace 8 on the surface.
For the detection method of the position of electric spark trace 8, illustrate as follows particularly.Such as, the amount of movement of the exterior film 1A measured by amount of movement tester 21 is set as the amount of movement of the exterior film 1A from the camera site of filming apparatus 22, in addition, the detection moment of electric spark trace 8 and the amount of movement of exterior film 1A is associated.Further, when electric spark trace 8 being detected, the position of the electric spark trace 8 on the length direction on the surface of (specific) exterior film 1A can be detected based on the amount of movement of the exterior film 1A corresponding with this detection moment.And then, by adding the detection position of the electric spark trace 8 on the Width on the surface of the exterior film 1A of filming apparatus 22 in its testing result, the position of the electric spark trace 8 on the length direction on the surface of (specific) exterior film 1A and Width can be detected.
Then, below the inspection method of the exterior film 1A using the testing fixture 10 of present embodiment is described.
The inspection method of present embodiment comprises electric spark trace 8 the spark discharge operation produced and the detection operation detecting electric spark trace 8 that the defect 7 being present in exterior film 1A by the surface at exterior film 1A is caused.
In spark discharge operation, while make exterior film 1A be moved in their length direction by the ground, roughly centre position between two electrodes 13,14 of spark discharge device 12 with exterior film 1A and each electrode 13,14 parallel and exterior film 1A and the discontiguous mode of each electrode 13,14 by mobile unit 16, between two electrodes 13,14, apply spark discharge voltage by high-voltage power supply 15.Thus, time between the defect 7 being present in exterior film 1A is by two electrodes 13,14, produce spark discharge in the part of this defect 7, make the part of the defect 7 on the surface of exterior film 1A produce electric spark trace 8.In addition, light (spark) and sound is sent with the generation (i.e. the generation of electric spark trace 8) of spark discharge.
Preferably, the spark discharge voltage put between two electrodes 13,14 by power supply 15 is configured to DC voltage 1.3 ~ 2.7kV, further preferably, 1 ~ 50mm is configured to respectively (preferably from inspection electrode 13 and ground-electrode 14 to the distance of exterior film 1A, 2 ~ 50mm), and the translational speed of the exterior film 1A realized by mobile unit 16 is configured to 10 ~ 200m/min.By such setting, can reliably produce electric spark trace 8, the defect 7 of diameter 0.06 ~ 2mm especially can be made reliably to produce electric spark trace 8.Consider the reliability of the inspection (filming apparatus) of processing speed, back segment, preferably the translational speed of the 1A of exterior film is 60 ~ 120m/min further.
In detection operation, measured the amount of movement of the exterior film 1A that move by amount of movement tester 21, and the shooting image that obtains detects electric spark trace 8 based on taking two surfaces of the exterior film 1A that move by the 1st filming apparatus 22a and the 2nd filming apparatus 22b respectively.Then, based on the detection moment of the electric spark trace 8 of filming apparatus 22 and the amount of movement of exterior film 1A that measured to by amount of movement tester 21, calculate and detect the position of the electric spark trace 8 on the surface of exterior film 1A.The concrete example of this detection method as described above.
The position of the electric spark trace 8 on the surface of exterior film 1A detected at the testing fixture 10 by present embodiment after, remove the part of electric spark trace 8 from exterior film 1A.Now, because the position of electric spark trace 8 detected, so can the position of electric spark trace 8 (i.e. defect 7) on the surface of easily specific exterior film 1A, therefore, it is possible to easily remove defect 7 from exterior film 1A.
Inspection method according to the present embodiment, because be not detect the defect 7 itself being present in exterior film 1A, but detect the electric spark trace 8 being exaggerated defect 7 size because of the spark discharge produced in the part of defect 7, so easily electric spark trace 8 can be checked by the eye, filming apparatus 22 etc. of examinant.Therefore, it is possible to the position of defect 7 on the surface of easily specific exterior film 1A.
And then, because based on the surface being taken exterior film 1A by filming apparatus 22 and the shooting image obtained detects electric spark trace 8, so can easily and reliably carry out the detection of electric spark trace 8, thus can the position of defect 7 on the surface of easily and reliably specific exterior film 1A.
And then, exterior film 1A is rectangular film, in spark discharge operation, while make exterior film 1A be moved in their length direction by the mode between two electrodes 13,14 with exterior film 1A, while apply spark discharge voltage between two electrodes 13,14, the surface of exterior film 1A can be made thus to produce electric spark trace 8, so can check rectangular exterior film 1A workability highland.
And, because based on the detection moment of the electric spark trace 8 of filming apparatus 22 and the amount of movement of exterior film 1A that measured to by amount of movement tester 21, detect the position of electric spark trace 8 on the surface of exterior film 1A, so can the position of defect 7 on the surface of more easily and more reliably specific exterior film 1A.
And, even if at least have the metal level (middle layer 3A) and resin bed (internal layer 2A that are laminated to each other at exterior film 1A, outer 4A, outermost layer 5A) when, also the surface of exterior film 1A can be made to produce electric spark trace 8, can the position of defect 7 on the surface of easily specific exterior film 1A.
And then in the detection method of present embodiment, light during generation preferably based on electric spark trace 8 and at least one party of sound, detect and there is electric spark trace 8 on the surface of exterior film 1A.By such setting, can detect more reliably and there is electric spark trace 8 on the surface of exterior film 1A.In addition, when this detection method, the light during generation of electric spark trace 8, sound can by detections such as the eye of examinant, ears, or can by detections such as photodetector, Miniature optical detecting devices.
The manufacture method of the electrochemical apparatus exterior film of one embodiment of the present invention comprises the operation being checked exterior film 1A by the inspection method of above-mentioned embodiment.Thus, when electric spark trace 8 being detected in detection operation, waited the part of removing electric spark trace 8 from exterior film 1A by excision, the defects 7 such as pin hole 7a can be obtained thus and do not exist or considerably less exterior film 1A.Further, conventionally manufacture bag-shaped and/or container-like grade for the exterior body of reservation shape by this exterior film 1A is used as exterior material, can obtain that there is the barrier exterior body of height.
The defect 7 that can be detected by the inspection method of present embodiment is except the pin hole 7a (being namely present in the pin hole of the outermost layer 5A of exterior film 1A) shown in above-mentioned Fig. 2, can also be as shown in Figure 4, the pin hole 7a being present in skin (resin bed) 4A, be present in the pin hole 7a of middle layer (metal level) 3A, be present in the pin hole 7a of internal layer (resin bed) 2A, be present in foreign matter (foreign matter be namely mixed in the exterior film 1A) 7b etc. of (bonding interfaces of 2 interlayers such as coincided with one another) in exterior film 1A, and then, not shown white point etc. can also be detected.Inspection method according to the present embodiment can be that the surface of exterior film 1A produces the electric spark trace 8 caused by these defects 7.
And then, the exterior film that can become the check object of the inspection method of present embodiment is not limited to the exterior film 1A of the 1st embodiment shown in Fig. 2, in addition, the exterior film 1B ~ 1D of the 2nd ~ 4th embodiment such as, shown in Fig. 5 ~ 7 also can become check object.
In the exterior film 1B of the 2nd embodiment shown in Fig. 5, outer 4B and outermost layer 5B clips the adhesion resin as cementing agent 6 between and extends along 2 axles by after Thermometal extrusion laminated bonding.Other structure is identical with the exterior film 1A of above-mentioned 1st embodiment shown in Fig. 2.Namely, internal layer 2B is such as tensionless winkler foundation polypropylene (CPP) rete, middle layer 3B is such as aluminium foil (Al) layer, outer 4B is such as biaxial stretch-formed nylon (ONy) rete, outermost layer 5B is such as biaxial stretch-formed polyethylene terephthalate (PET) rete, and adhesion resin is maleated polypropylene resin.Further, internal layer 2B and middle layer 3B is bondd by marginal cementing agent 6, and middle layer 3B and outer 4B is bondd by marginal cementing agent 6.
In the exterior film 1C of the 3rd embodiment shown in Fig. 6, outer 4C is only 1 layer, such as, be biaxial stretch-formed nylon (ONy) rete.The exterior film 1A of above-mentioned 2nd embodiment shown in other structure with Fig. 2 is identical.That is, internal layer 2C is such as tensionless winkler foundation polypropylene (CPP) rete, and middle layer 3C is such as aluminium foil (Al) layer.Further, internal layer 2C and middle layer 3C is bondd by marginal cementing agent 6, and middle layer 3C and outer 4C is bondd by marginal cementing agent 6.
In the exterior film 1D of the 4th embodiment shown in Fig. 7, identical with above-mentioned 3rd embodiment, outer 5D is only 1 layer, such as, be biaxial stretch-formed polyethylene terephthalate (PET) rete.Other structures are identical with the exterior film 1A of above-mentioned 2nd embodiment shown in Fig. 2.That is, internal layer 2D is such as tensionless winkler foundation polypropylene (CPP) rete, and middle layer 3D is such as aluminium foil (Al) layer.Further, internal layer 2D and middle layer 3D is bondd by marginal cementing agent 6, and middle layer 3D and outer 5D bonds via marginal cementing agent 6.
And then although not shown, exterior film can internal layer be also two-layer, the multilayers such as three layers.And then, also can exterior film 1A, the 1B of the 1st and the 2nd embodiment as shown in Figure 2 and Figure 5 such, skin becomes the multilayer such as two-layer.
Be explained above embodiments of the present invention, but the present invention is not limited to above-mentioned embodiment, various change can be carried out in the scope not departing from main idea of the present invention.
The exterior film that can become the check object of inspection method of the present invention is not limited to the exterior body of the battery key element being used in the secondary cells such as storage lithium rechargeable battery as exterior material, in addition, the exterior body of the capacitor key element of storage double layer capacitor such as also can be used in as exterior material, in addition, the exterior body of the electrochemical apparatus key element of receiving other also can be used in as exterior material.
Embodiment
Then, below specific embodiment of the present invention is described.But the present invention is not limited to following embodiment.
As exterior film, prepare the exterior film 1A of the 1st embodiment shown in Fig. 2.The internal layer 2A of exterior film 1A is tensionless winkler foundation polypropylene (CPP) rete of thickness 80 μm, middle layer 3A is aluminium (Al) layers of foil of thickness 40 μm, outer 4A is biaxial stretch-formed nylon (ONy) rete of thickness 15 μm, and outermost layer 5A is biaxial stretch-formed polyethylene terephthalate (PET) rete of thickness 12 μm.
At the outermost layer 5A of exterior film 1A, worn the pin hole 7a of a large amount of diameter 0.02mm, 0.06mm, 0.1mm, 0.5mm and 2mm from the surface of exterior film 1A by laser beam irradiation as the defect 7 being present in exterior film 1A.The degree of depth of each pin hole 7a is roughly the same with the thickness of outermost layer 5A.
Then, by using the testing fixture 10 of the present embodiment shown in Fig. 1 to check exterior film 1A, have rated and electric spark trace 8 can be detected.It checks condition as described below.
The spark discharge applied between two electrodes 13,14 is with voltage (DC voltage): 1.3kV, 1.8kV, 2.2kV, 2.5kV, 2.7kV, 3.0kV, 4.0kV.
From checking the distance of electrode 13 to exterior film 1A: 15mm.
The translational speed of exterior film 1A: 30m/min.
Its evaluation result as described below.
For the pin hole beyond the pin hole of diameter 0.02mm, all electric spark trace can be detected.On the other hand, for the pin hole of diameter 0.02mm, its major part can detect electric spark trace, but its part can not detect electric spark trace.
In addition, when spark discharge voltage is more than 3.0kV, not only pin hole, the part of the small dust on the surface being attached to exterior film also creates spark discharge and has been checked through electric spark trace.Therefore, by spark discharge voltage sets is become 1.3 ~ 2.7kV to check, confirm reliably to detect the electric spark trace caused by pin hole.
And then, by making, from checking that the distance of electrode 13 to exterior film 1A changes and make the translational speed of exterior film 1A change to carry out above-mentioned inspection in the scope of 10 ~ 200m/min in the scope of 1 ~ 50mm, to obtain the result same with above-mentioned evaluation result.
The application advocates the right of priority of No. 2014-186454, the patented claim of Japan's patented claim that on September 12nd, 2014 applies for, its disclosure former state forms a application's part.
Term as used herein and expression be for illustration of instead of for limited explanation, be not precluded within and illustrate and all equipollents of feature item described herein, the various distortion allowed in the scope described in claims of the present invention must be recognized.
The present invention can instantiated in many different ways, it openly should be counted as the embodiment for providing principle of the present invention, these embodiments be not intended to limit the invention to herein record, preferred embodiment illustrated, on the basis having understood these, a lot of illustrated embodiment is recorded in this.
Utilizability in industry
The present invention can be used in electrochemical apparatus (example: lithium rechargeable battery, double layer capacitor) inspection method of exterior film and the manufacture method of exterior film.
Claims (7)
1. an inspection method for electrochemical apparatus exterior film, wherein, comprises:
Spark discharge operation, makes the surface of the exterior film formed by the laminated film with multilayer produce the electric spark trace caused by the defect being present in described exterior film; With
Detect operation, detect described electric spark trace.
2. the inspection method of electrochemical apparatus exterior film according to claim 1, wherein,
In described detection operation, based on the surface being taken described exterior film by filming apparatus and the shooting image obtained detects described electric spark trace.
3. the inspection method of electrochemical apparatus exterior film according to claim 1, wherein,
Described exterior film is rectangular film,
In described spark discharge operation, while the mode between the pair of electrodes making described exterior film be possessed by spark discharge device with described exterior film is relative to the relative movement on the length direction of described exterior film of described pair of electrodes, while apply spark discharge voltage between described pair of electrodes, described electric spark trace is produced thus on the surface of described exterior film
In described detection operation,
The amount of movement of the described exterior film that move is measured by amount of movement tester, and based on the surface being taken the described exterior film that move by filming apparatus and the shooting image obtained detects described electric spark trace,
And then, based on the detection moment of the described electric spark trace of described filming apparatus and the amount of movement of described exterior film that measured to by described amount of movement tester, detect the position of the described electric spark trace on the surface of described exterior film.
4. the inspection method of electrochemical apparatus exterior film according to claim 3, wherein,
Described pair of electrodes is left in parallel with each other and is configured to relative shape, and the side in described pair of electrodes is the electrode of ground connection, and the opposing party is earth-free inspection electrode,
In described spark discharge operation, described spark discharge electricity consumption is installed with and is decided to be DC voltage 1.3 ~ 2.7kV, be set as 1 ~ 50mm by from described inspection electrode to the distance of described exterior film, the translational speed of exterior film is set as 10 ~ 200m/min, make described exterior film relative movement.
5. the inspection method of electrochemical apparatus exterior film according to any one of claim 1 to 4, wherein,
In described detection operation, light when also producing based on described electric spark trace and at least one party in sound, detect and there is electric spark trace on the surface of described exterior film.
6. the inspection method of electrochemical apparatus exterior film according to any one of claim 1 to 5, wherein,
Described exterior film at least has metal level and resin bed as described multilayer.
7. a manufacture method for electrochemical apparatus exterior film, comprises the operation being checked exterior film by the inspection method of the electrochemical apparatus exterior film according to any one of claim 1 to 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-186454 | 2014-09-12 | ||
| JP2014186454A JP2016057271A (en) | 2014-09-12 | 2014-09-12 | Inspection method of exterior film for electrochemical device |
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