CN107340182A - Weigh the measuring method of soft package lithium battery punching press packaging bag security - Google Patents
Weigh the measuring method of soft package lithium battery punching press packaging bag security Download PDFInfo
- Publication number
- CN107340182A CN107340182A CN201610865773.5A CN201610865773A CN107340182A CN 107340182 A CN107340182 A CN 107340182A CN 201610865773 A CN201610865773 A CN 201610865773A CN 107340182 A CN107340182 A CN 107340182A
- Authority
- CN
- China
- Prior art keywords
- packaging bag
- packaging
- lithium battery
- sample
- packaging film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
Abstract
The measuring method of soft package lithium battery punching press packaging bag security is weighed, belongs to lithium battery packing technique field.The present invention is that the packaging film of lithium ion battery thickness in stamping process is thinning to have potential safety hazard in order to solve, it is impossible to carries out the problem of effective and safe is assessed.It obtains the true stress―strain curve of packaging film first；Further according to the battery core design size of lithium battery, three-dimensional modeling is carried out to packaging bag sample；Packaging bag sensitive part thinning in forming process is obtained using method for numerical simulation；Sensitive part is cut off, the both side surface at the packaging bag sample section with sensitive part is clamped with polymer material layer all standing, is fixed on quick cutter；Cut and packaging bag diaphragm is obtained at the mark point of packaging bag sample；The diaphragm section is placed in parallel with microscope viewing objective；The packaging film aluminum layer thickness of measuring diaphragm section part.The present invention is used for the measurement of lithium battery packaging film shaping security.
Description
Technical field
The present invention relates to the measuring method for weighing soft package lithium battery punching press packaging bag security, belong to lithium battery packing technique
Field.
Background technology
In soft bag lithium ionic cell field, packaging bag to lithium ion battery product excellent rate and it is safe to use play it is most important
Effect.But packaging bag material therefor is relatively thin, original thickness typically between 70um-100um, its primary intensity supporting role
Aluminium lamination/aluminium foil, thickness is more between 35-60 μm, and thickness can further reduce after stamped shaping, it is easy in packaging bag angle position
Microdefect is caused, is hidden some dangers for for safety problem.And existing packaging bag punching production technique, not to this safety problem
The method assessed.Common camera bellows observation, only when microfissure occurs in packaging bag, just it is observed that defect, than
It is more rough.
According to existing technical conditions, it is considered that, once aluminium lamination/aluminum foil thickness is less than 25 μm, and it is to ventilative, permeable
Shielding will be reduced quickly, be that lithium battery institute is unallowable, while for intensity angle, in the situation without microfissure
Under, the thickness of aluminium lamination/aluminium foil is bigger, then the protective effect to the naked battery core of lithium electricity is also bigger, and certain falls under hit intensity, goes wrong
Probability it is also smaller.
The content of the invention
The invention aims to solve, the packaging film of lithium ion battery thickness in stamping process is thinning to have peace
Full hidden danger, it is impossible to carry out the problem of effective and safe is assessed, there is provided one kind weighs soft package lithium battery punching press packaging bag security
Measuring method.
The measuring method of the present invention for weighing soft package lithium battery punching press packaging bag security, it comprises the following steps：
Step 1：Using electronics extension test method, the vertical and horizontal of testing package film form the curve of load, and are located
Reason, is separately converted to longitudinal true stress―strain curve of packaging film and horizontal true stress―strain curve；
Step 2：According to the battery core design size of lithium battery, three-dimensional modeling is carried out to packaging bag sample；The packaging bag sample
Product are by the stamping acquisition of packaging film；
Step 3：According to the true stress―strain curve of packaging film and the three-dimensional modeling of packaging bag sample, using Numerical-Mode
Plan method obtains packaging bag sensitive part thinning in forming process；
Step 4：The sensitive part is marked in packaging bag sample, and the bag is cut off in the position close to mark point
Pack sample；Then the both side surface at the packaging bag sample section with sensitive part is clamped with polymer material layer all standing
Firmly, it is fixed on quick cutter；
Step 5：Start quick cutter, cut and packaging bag diaphragm is obtained at the mark point of packaging bag sample；
Step 6：Corresponding with sensitive part diaphragm section is determined by microscope, and by the diaphragm section and microscope
Viewing objective is placed in parallel；
Step 7：The packaging film aluminum layer thickness of measuring diaphragm section part, according to the packaging film aluminum layer thickness to packaging bag
The security of sample is assessed.
Advantages of the present invention：The measuring method of the present invention that security is shaped to packaging film, can effectively assess lithium
The thinning degree of material after the stamped shaping of ion battery packaging film, to optimize Sheet Metal Forming Technology, battery core security performance assessing provides
Strong support.
The inventive method can just detect relative to prior art when there is bad product, make bag membrane
The thinning degree of piece is being possibly realized using preceding carrying out evaluation, is further optimized for aluminum-plastic composite membrane Sheet Metal Forming Technology, there is provided strong
Support.It effectively prevent the waste of manpower and materials, improve battery core production excellence rate and the security using process.
Brief description of the drawings
Fig. 1 is the direction schematic diagram of packaging film；Arrow represents composite membrane coiling direction in figure；
Fig. 2 is the longitudinal stretching true stress―strain curve figure of aluminum plastic film in embodiment；
Fig. 3 is the cross directional stretch true stress―strain curve figure of aluminum plastic film in embodiment；
Fig. 4 is stamping extended state schematic diagram when being packaging bag of packaging film；
Fig. 5 is the schematic diagram observed with electron microscope cutting section in embodiment.
Embodiment
Embodiment one：Illustrate present embodiment with reference to Fig. 1 to Fig. 5, Soft Roll is weighed described in present embodiment
The measuring method of lithium battery punching press packaging bag security, it comprises the following steps：
Step 1：Using electronics extension test method, the vertical and horizontal of testing package film form the curve of load, and are located
Reason, is separately converted to longitudinal true stress―strain curve of packaging film and horizontal true stress―strain curve；
Step 2：According to the battery core design size of lithium battery, three-dimensional modeling is carried out to packaging bag sample；The packaging bag sample
Product are by the stamping acquisition of packaging film；
Step 3：According to the true stress―strain curve of packaging film and the three-dimensional modeling of packaging bag sample, using Numerical-Mode
Plan method obtains packaging bag sensitive part thinning in forming process；
Step 4：The sensitive part is marked in packaging bag sample, and the bag is cut off in the position close to mark point
Pack sample；Then the both side surface at the packaging bag sample section with sensitive part is clamped with polymer material layer all standing
Firmly, it is fixed on quick cutter；
Step 5：Start quick cutter, cut and packaging bag diaphragm is obtained at the mark point of packaging bag sample；
Step 6：Corresponding with sensitive part diaphragm section is determined by microscope, and by the diaphragm section and microscope
Viewing objective is placed in parallel；
Step 7：The packaging film aluminum layer thickness of measuring diaphragm section part, according to the packaging film aluminum layer thickness to packaging bag
The security of sample is assessed.
The cutting speed of quick cutter is 0.1-1m/s in step 5.
The packaging bag sample is to obtain packaging film using mould punching shaping；The length direction of packaging bag sample is bag
Fill the direction that tensile strength is larger in film vertical and horizontal direction.
In step 7, the packaging film aluminum layer thickness of diaphragm section part three times is measured, is averaged as diaphragm section part
Packaging film aluminum layer thickness.
In present embodiment step 1, the formation curve of load to packaging film is handled, and is carried out using mathematical method
Processing；Three-dimensional modeling is carried out to packaging bag sample using 3D sculpting software in step 2, can be by three-dimensional modeling model conversation
The relevant file formats such as stl, imported into numerical simulation software；Packaging film is aluminum-plastic composite membrane；Numerical simulation in step 3,
Deform softwares etc. can be used, the method that packaging film punching course calculates is simulated and calculated, acquisition punching press and ess-strain
Distribution, so as to speculate crackly position, i.e. position the most serious, and the position that strain is maximum is thinned in packaging bag；Step
Using marking pen mark sensitive part in rapid four, packaging bag sample is cut off with scissors, is clamped with the harder high polymer material of quality
Firmly packaging bag sample section, then the packaging bag sample entirety both sides of polymer material layer and inner clip are clamped with clip, it is firmly solid
It is scheduled on quick cutter；Working angles in step 5 need close observation, untill being cut to marking pen labeling position；
Packaging bag sample in step 4, shaped using mould punching, orientation of putting of the packaging bag sample in punching press is：Take
Direction of the larger direction of packaging film tensile strength as the relatively long side of the packaging bag sample of shaping；It will be cut in step 6
Section is cut to move integrally on light microscope or electron microscope workbench, it is fixed, microscope ocular and object lens are adjusted, it is determined that with
Diaphragm section corresponding to sensitive part；The measurement of thickness is carried out in step 7 using the instrument that is measured microscopically, measures aluminum layer thickness
It is because aluminium lamination plays most important protective effect for the security of battery core.After carrying out above-mentioned measurement, according to the thinning journey of packaging film
Degree, the fabrication strength of packaging film can be calculated, so as to provide foundation for battery core security performance assessing, Sheet Metal Forming Technology optimization.
Embodiment：Certain model battery core, Japan's production thickness is used as 86um aluminum-plastic composite membrane, wherein nylon material ny25,
Aluminium lamination 40, stress-strain diagram test is carried out to aluminum-plastic composite membrane first, is changed into the true stress―strain curve of aluminum plastic film such as
Shown in Fig. 2 and Fig. 3, while related data is input in Finite Element Simulation Software deform3D.
Using pro/E softwares, punch-pin is designed, its face size is 42x32mm, and its corresponding cavity plate size
42.2x32.1mm, stl file formats are saved as, imported in deform3D softwares, primary condition and boundary condition are set, carried out
FEM calculation.To the interpretation of result after calculating, it is found that thinning region the most serious is 4 drift angles of packaging bag, such as Fig. 4 institutes
Show, strain is maximum at this, thinning most serious.
With marking pen by the most thin part mark of packaging bag drift angle, cut off, be clipped in the harder macromolecule material of certain thickness quality
Among material, be fixed on quick cutter and cut, then observed again with Olympus electron microscopic as shown in figure 5,
Test result size is as shown in table 1：
Claims (4)
1. a kind of measuring method for weighing soft package lithium battery punching press packaging bag security, it is characterised in that it comprises the following steps：
Step 1：Using electronics extension test method, the vertical and horizontal of testing package film form the curve of load, and are handled,
It is separately converted to longitudinal true stress―strain curve of packaging film and horizontal true stress―strain curve；
Step 2：According to the battery core design size of lithium battery, three-dimensional modeling is carried out to packaging bag sample；The packaging bag sample by
The stamping acquisition of packaging film；
Step 3：According to the true stress―strain curve of packaging film and the three-dimensional modeling of packaging bag sample, using numerical simulation side
Method obtains packaging bag sensitive part thinning in forming process；
Step 4：The sensitive part is marked in packaging bag sample, and the packaging bag is cut off in the position close to mark point
Sample；Then the both side surface at the packaging bag sample section with sensitive part is clamped with polymer material layer all standing,
It is fixed on quick cutter；
Step 5：Start quick cutter, cut and packaging bag diaphragm is obtained at the mark point of packaging bag sample；
Step 6：Corresponding with sensitive part diaphragm section is determined by microscope, and by the diaphragm section and micro- sem observation
Objective parallel is placed；
Step 7：The packaging film aluminum layer thickness of measuring diaphragm section part, according to the packaging film aluminum layer thickness to packaging bag sample
Security assessed.
2. the measuring method according to claim 1 for weighing soft package lithium battery punching press packaging bag security, it is characterised in that
The cutting speed of quick cutter is 0.1-1m/s in step 5.
3. the measuring method according to claim 2 for weighing soft package lithium battery punching press packaging bag security, it is characterised in that
The packaging bag sample is to obtain packaging film using mould punching shaping；The length direction of packaging bag sample is packaging film longitudinal direction
The larger direction with tensile strength in horizontal direction.
4. the measuring method of the measurement soft package lithium battery punching press packaging bag security according to claim 1,2 or 3, its feature
It is, in step 7, measures the packaging film aluminum layer thickness of diaphragm section part three times, the packaging averaged as diaphragm section part
Film aluminum layer thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610865773.5A CN107340182A (en) | 2016-09-29 | 2016-09-29 | Weigh the measuring method of soft package lithium battery punching press packaging bag security |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610865773.5A CN107340182A (en) | 2016-09-29 | 2016-09-29 | Weigh the measuring method of soft package lithium battery punching press packaging bag security |
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| Publication Number | Publication Date |
|---|---|
| CN107340182A true CN107340182A (en) | 2017-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610865773.5A Pending CN107340182A (en) | 2016-09-29 | 2016-09-29 | Weigh the measuring method of soft package lithium battery punching press packaging bag security |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630021A (en) * | 2020-11-25 | 2021-04-09 | 惠州亿纬锂能股份有限公司 | Method for testing battery core sleeve label |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202495548U (en) * | 2012-02-13 | 2012-10-17 | 东莞新能源科技有限公司 | Flexible packaging lithium ion battery |
| CN202585641U (en) * | 2012-03-19 | 2012-12-05 | 宁德新能源科技有限公司 | Flexible packaged lithium battery |
| CN203637251U (en) * | 2014-01-02 | 2014-06-11 | 哈尔滨理工大学 | Lithium battery aluminum-plastic film packing bag stamping male die |
| CN105352804A (en) * | 2015-11-30 | 2016-02-24 | 深圳市星源材质科技股份有限公司 | Method for detecting service life of tensioned dry method uniaxial tension diaphragm |
-
2016
- 2016-09-29 CN CN201610865773.5A patent/CN107340182A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202495548U (en) * | 2012-02-13 | 2012-10-17 | 东莞新能源科技有限公司 | Flexible packaging lithium ion battery |
| CN202585641U (en) * | 2012-03-19 | 2012-12-05 | 宁德新能源科技有限公司 | Flexible packaged lithium battery |
| CN203637251U (en) * | 2014-01-02 | 2014-06-11 | 哈尔滨理工大学 | Lithium battery aluminum-plastic film packing bag stamping male die |
| CN105352804A (en) * | 2015-11-30 | 2016-02-24 | 深圳市星源材质科技股份有限公司 | Method for detecting service life of tensioned dry method uniaxial tension diaphragm |
Non-Patent Citations (1)
| Title |
|---|
| 张鹏博等: "锂离子电池用铝塑复合膜精密冲压工艺研究", 《热加工工艺》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630021A (en) * | 2020-11-25 | 2021-04-09 | 惠州亿纬锂能股份有限公司 | Method for testing battery core sleeve label |
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Application publication date: 20171110 |