CN107727296A - The method of testing of cylinder battery winding core inner stress - Google Patents
The method of testing of cylinder battery winding core inner stress Download PDFInfo
- Publication number
- CN107727296A CN107727296A CN201710326414.7A CN201710326414A CN107727296A CN 107727296 A CN107727296 A CN 107727296A CN 201710326414 A CN201710326414 A CN 201710326414A CN 107727296 A CN107727296 A CN 107727296A
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- China
- Prior art keywords
- hard lead
- pulling force
- testing
- battery
- barrier film
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/06—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using mechanical means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to cell manufacturing techniques field, more particularly to a kind of method of testing of cylinder battery winding core inner stress, comprise the following steps：S1：Hard lead is provided, by hard lead together with being involved in positive plate and barrier film or battery roll core being formed in negative plate and barrier film during battery winder winding positive electrode sheet, barrier film and negative plate, the stress that battery roll core acts on hard lead is F；S2：Measurer for pulling force is provided, the clamp hard lead of measurer for pulling force is exposed into the one end outside battery roll core and pulls hard lead；S3：Pulling force f when measurer for pulling force pulls hard lead is read, F=f/ μ are calculated according to formula f=μ * F；Wherein, μ is definite value.The stress F of battery roll core difference interlayer big I is represented by the pulling force f of puller system test value, by comparing different stress differences between layers, optimize tension distribution of the battery winder in winding process, and then the performances such as the uniformity of battery roll core, circulation, multiplying power can be improved.
Description
Technical field
The invention belongs to cell manufacturing techniques field, more particularly to a kind of test side of cylinder battery winding core inner stress
Method.
Background technology
There is the multilaminate coiled structure of positive plate, negative plate, barrier film in cylindrical lithium ion battery, in battery charge and discharge process
In, the expansion of positive plate has important shadow with shrinking to the distribution of electrolyte, lithium ion conduction, stress of foil etc. in core
Ring.Therefore, different force differences between layers inside core are studied, optimize up- coiler tension distribution in winding process, it is right
Improving the performances such as cylindrical lithium ion battery uniformity, circulation, multiplying power has material impact.The method master of stress inside existing research
If being characterized by stress, the main method of testing of ess-strain includes：It is foil gauge electrical measuring method, fibre grating method, photoelastic
Property method, binocular stereo vision method etc..But these method of testings can only be tested integrated stress outside core, it is impossible to tested
The difference of different stress between layers inside core, it is poor according to different stress between layers inside core so as to lead to not
It is different to optimize tension distribution of the up- coiler in winding process.
The content of the invention
It is an object of the invention to provide a kind of method of testing of cylinder battery winding core inner stress, it is intended to solves existing skill
Stress-strain test method in art can not test the technical problem of different stress between layers inside core.
To achieve the above object, the technical solution adopted by the present invention is：A kind of test of cylinder battery winding core inner stress
Method, comprise the following steps：
S1：Hard lead is provided, by the hard during battery winder winding positive electrode sheet, barrier film and negative plate
Lead is together with being involved in the positive plate and the barrier film or battery roll core, the electricity are formed in the negative plate and the barrier film
The stress that pond core acts on the hard lead is F；
S2：Measurer for pulling force is provided, hard lead described in the clamp of the measurer for pulling force is exposed into the battery
One end outside core simultaneously pulls the hard lead；
S3：The pulling force f when measurer for pulling force pulls the hard lead is read, F is calculated according to formula f=μ * F
=f/ μ；Wherein, μ is definite value.
Preferably, in the step S3, read the measurer for pulling force and pull the pulling force f during hard lead to include
Surrender the maximum static friction force f when hard lead slidesMaximum static friction forceAt the uniform velocity pull the sliding friction during hard lead
Power fForce of sliding friction。
Preferably, in the step S1, the hard lead remains perpendicular to level when being located in the battery roll core
Face sets or set parallel to horizontal plane.
Preferably, in the step S1, the hard lead is between the adjacent positive plate and the barrier film
Or between the adjacent negative plate and the barrier film.
Preferably, in the step S1, the even surface roughness of the hard lead is consistent.
Preferably, in the step S1, the hard lead is metal wire rod or nonmetallic wire rod.
Preferably, in the step S1, the hard lead is cylindrical hard lead.
Preferably, the diameter of the cylindrical hard lead is less than 0.1mm.
Preferably, in the step S1, the surface roughness Ra of the hard lead is 0.01 μm~0.08 μm.
Beneficial effects of the present invention：The present invention cylinder battery winding core inner stress method of testing, it will thus provide hard
Lead is placed in by being wound in positive plate and barrier film or in negative plate and barrier film in the battery roll core formed, in this way, battery roll core pair
Hard lead is applied with stress F, then pulls hard lead by same measurer for pulling force, finally by reading measurer for pulling force
In pulling force be f, and F=f/ μ are calculated according to formula f=μ * F；Wherein, μ is definite value.By different to battery roll core inside
Layer and the test of layer, can obtain multiple F=f/ μ values, because for definite value, pulling force f and stress F are linear positive correlation, i.e. battery
The stress F of core difference interlayer big I is represented by the pulling force f of puller system test value.In this way, by comparing battery roll core
Internal different stress differences between layers, optimization battery winder is during winding positive electrode sheet, barrier film and negative plate
Tension distribution, and then the performances such as the uniformity of battery roll core, circulation, multiplying power can be improved.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Accompanying drawing obtains other accompanying drawings.
Fig. 1 is the schematic diagram of the working condition of measurer for pulling force provided in an embodiment of the present invention.
Fig. 2 is located at structural representation when in battery roll core for hard lead provided in an embodiment of the present invention.
Fig. 3 is located at internal structure schematic diagram when in battery roll core for hard lead provided in an embodiment of the present invention.
Fig. 4 is the flow chart of the method for testing of cylinder battery winding core inner stress provided in an embodiment of the present invention.
Wherein, each reference in figure：
10-hard lead 20-measurer for pulling force, 21-fixture
30-battery roll core, 31-positive plate, 32-negative plate
33-barrier film.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
As shown in figures 1-4, the embodiments of the invention provide a kind of method of testing of cylinder battery winding core inner stress, bag
Include following steps：
S1：Hard lead 10 is provided, in battery winder (not shown) winding positive electrode sheet 31, barrier film 33 and negative plate 32
During by the hard lead 10 together be involved in the positive plate 31 and the barrier film 33 or the negative plate 32 and it is described every
Battery roll core 30 is formed in film 33, the stress that the battery roll core 30 acts on the hard lead 10 is F；
S2：Measurer for pulling force 20 is provided, the fixture 21 of the measurer for pulling force 20 is clamped into the hard lead 10 and exposed
One end outside the battery roll core 30 simultaneously pulls the hard lead 10；
S3：The pulling force f when measurer for pulling force 20 pulls the hard lead 10 is read, is calculated according to formula f=μ * F
Go out F=f/ μ；Wherein, μ is definite value.Wherein, μ by the surface of hard lead 10, the surface of positive plate 31, the surface of barrier film 33 and is born
The surface of pole together decides on, identical lead, identical pole piece material, the surface roughness of identical barrier film 33 be approximately the same or difference compared with
It is small, it can thus be assumed that μ is definite value.
Specifically, the method for testing of the cylinder battery winding core inner stress of the embodiment of the present invention, it will thus provide hard lead
10 are placed in by being wound in positive plate 31 and barrier film 33 or in negative plate 32 and barrier film 33 in the battery roll core 30 formed, in this way, electric
Pond core 30 is applied with stress F to hard lead 10, then pulls hard lead 10 by same measurer for pulling force 20, finally leads to
It is f to cross the pulling force read in measurer for pulling force 20, and calculates F=f/ μ according to formula f=μ * F；Wherein, μ is definite value.Pass through
Test to the inside different layers of battery roll core 30 and layer, multiple F=f/ μ values can be obtained, due to for definite value, pulling force f and stress F
For linear positive correlation, i.e. the stress F of 30 different interlayers of battery roll core big I is represented by the pulling force f of puller system test value.
In this way, by comparing the different stress differences between layers in the inside of battery roll core 30, optimization battery winder is in winding positive pole
Tension distribution during piece 31, barrier film 33 and negative plate 32, so can improve the uniformity of battery roll core 30, circulation,
The performances such as multiplying power.
It should be noted that the method for testing of cylinder battery winding core inner stress provided in an embodiment of the present invention can be right
Battery roll core 30 before expansion is tested, and the battery roll core 30 after expansion can also be tested.
More specifically, for example, the stress for the internal layer of battery roll core 30 that ought be tested out for the first time is F=1/ μ, test for second
The stress of the internal layer of battery roll core 30 gone out is F=2/ μ, and the stress of the internal layer of battery roll core 30 tested out for the third time is F=3/ μ,
The stress of 4th internal layer of battery roll core 30 tested out is F=4/ μ, and the stress ratio that can so compare between four layers is respectively
1/ μ, 2/ μ, 3/ μ and 4/ μ, so it is known that battery roll core 30 has the internal layer position of larger stress difference, so as under
During secondary winding battery roll core 30, of the optimization battery winder during winding positive electrode sheet 31, barrier film 33 and negative plate 32
Power is distributed, and then can improve the performances such as the uniformity of battery roll core 30, circulation, multiplying power.
In the present embodiment, in the step S3, read when the measurer for pulling force 20 pulls the hard lead 10
Pulling force f includes surrendering the maximum static friction force f when hard lead 10 slidesMaximum static friction forceAt the uniform velocity pull the hard lead
Force of sliding friction f when 10Force of sliding friction.Specifically, according to the f tested outMaximum static friction forceAnd fForce of sliding frictionTwo kinds of stress can be calculated respectively
Value F, it so can more specifically recognize battery winder during winding positive electrode sheet 31, barrier film 33 and negative plate 32
Tension distribution.Wherein, maximum static friction force fMaximum static friction forceSurveyed when starting drag hard lead 10 for measurer for pulling force 20 from pulling force
The numerical value read in test-run a machine 20, and force of sliding friction fForce of sliding frictionWhen then at the uniform velocity to pull hard lead 10 from measurer for pulling force 20
The numerical value of reading.
In the present embodiment, keep hanging down in the step S1, when the hard lead 10 is located in the battery roll core 30
Directly set in horizontal plane or set parallel to horizontal plane.Specifically, ensure that hard lead 10 is in straightened condition, i.e. hard draws
Line 10 is perpendicular to horizontal plane or parallel to horizontal plane, and under such a state, measurer for pulling force 20 pulls hard lead 10 to slide
When dynamic, it can be ensured that the pulling force of test is that f shows actual value to greatest extent.
In the present embodiment, in the step S1, the hard lead 10 be located at the adjacent positive plate 31 with it is described
Between barrier film 33 or between the adjacent negative plate 32 and the barrier film 33.Specifically, when hard lead 10 is placed in positive pole
Between piece 31 and barrier film 33, that is, what is tested out is the stress that barrier film 33 and positive plate 31 apply to hard lead 10 simultaneously.Similarly,
When hard lead 10 is placed between negative plate 32 and barrier film 33, that is, what is tested out is that barrier film 33 and negative plate 32 draw to hard simultaneously
The stress that line 10 applies.The stress situation between different layers in battery roll core 30 can be so tested out, so as to be wound in next time
During battery roll core 30, tension distribution of the optimization battery winder during winding positive electrode sheet 31, barrier film 33 and negative plate 32,
And then the performances such as the uniformity of battery roll core 30, circulation, multiplying power can be improved.
In the present embodiment, in the step S1, the even surface roughness of the hard lead 10 is consistent.Specifically,
Ensure that the surface roughness of hard lead 10 unanimously may insure in test process, in the battery roll core 30 reflected different layers it
Between stress situation show actual value to greatest extent.
In the present embodiment, in the step S1, the hard lead 10 is metal wire rod or nonmetallic wire rod.Specifically
Ground, according to the actual requirements, copper cash conjunction or golden copper cash and other non-metal wires can be used to be used as hard lead 10.
In the present embodiment, in the step S1, the hard lead 10 is cylindrical hard lead.Specifically, use
The hard lead 10 of cylindrical structural can be designed to it is more tiny, so may insure test when it is better.
In the present embodiment, the diameter of the cylindrical hard lead is less than 0.1mm.Specifically, cylindrical hard lead
Diameter can be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm or 0.09mm.
Several numerical value are only enumerating for the present embodiment, are less than 0.1mm numerical value in remaining diameter.It is less than by the diameter
The cylindrical hard lead of 0.1mm numerical Design is while ensuring that it plays test effect, it is ensured that it will not be to positive plate
31st, barrier film 33 or negative plate 32 cause to damage, and then ensure the reliable of method of testing.
Preferably, in the step S1, the surface roughness Ra of the hard lead 10 is 0.01 μm~0.08 μm.Example
Such as, the surface roughness Ra of hard lead 10 can be 0.01 μm, 0.02 μm, 0.03 μm, 0.04 μm, 0.05 μm, 0.06 μm,
0.07 μm or 0.08 μm.The smoothness of hard lead 10 of so surface roughness Ra of number range is splendid, in order to avoid during test
Positive plate 31, barrier film 33 or negative plate 32 are caused to damage, are advantageous to carry out test experiments.
It should be noted that the battery winder and measurer for pulling force 20 in the present embodiment are the equipment of prior art,
No longer the detailed structure and operation principle of battery winder and measurer for pulling force 20 are repeated one by one herein.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
1. a kind of method of testing of cylinder battery winding core inner stress, it is characterised in that comprise the following steps：
S1：Hard lead is provided, by the hard lead during battery winder winding positive electrode sheet, barrier film and negative plate
Together with being involved in the positive plate and the barrier film or battery roll core, the battery winding formed in the negative plate and the barrier film
The stress that core acts on the hard lead is F；
S2：Measurer for pulling force is provided, hard lead described in the clamp of the measurer for pulling force is exposed into the battery roll core
Outer one end simultaneously pulls the hard lead；
S3：The pulling force f when measurer for pulling force pulls the hard lead is read, F=f/ is calculated according to formula f=μ * F
μ；Wherein, μ is definite value.
2. the method for testing of cylinder battery winding core inner stress according to claim 1, it is characterised in that in the step
In S3, read the measurer for pulling force and pull the pulling force f during hard lead to include surrendering when the hard lead slides
Maximum static friction force fMaximum static friction forceAt the uniform velocity pull the force of sliding friction f during hard leadForce of sliding friction。
3. the method for testing of cylinder battery winding core inner stress according to claim 3, it is characterised in that in the step
In S1, the hard lead remains perpendicular to horizontal plane and sets or set parallel to horizontal plane when being located in the battery roll core
Put.
4. the method for testing of cylinder battery winding core inner stress according to claim 1, it is characterised in that in the step
In S1, the hard lead between the adjacent positive plate and the barrier film or the adjacent negative plate with it is described
Between barrier film.
5. the method for testing of the cylinder battery winding core inner stress according to any one of Claims 1 to 4, it is characterised in that
In the step S1, the even surface roughness of the hard lead is consistent.
6. the method for testing of the cylinder battery winding core inner stress according to any one of Claims 1 to 4, it is characterised in that
In the step S1, the hard lead is metal wire rod or nonmetallic wire rod.
7. the method for testing of the cylinder battery winding core inner stress according to any one of Claims 1 to 4, it is characterised in that
In the step S1, the hard lead is cylindrical hard lead.
8. the method for testing of cylinder battery winding core inner stress according to claim 7, it is characterised in that the cylinder
The diameter of hard lead is less than 0.1mm.
9. the method for testing of the cylinder battery winding core inner stress according to any one of Claims 1 to 4, it is characterised in that
In the step S1, the surface roughness Ra of the hard lead is 0.01 μm~0.08 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710326414.7A CN107727296A (en) | 2017-05-10 | 2017-05-10 | The method of testing of cylinder battery winding core inner stress |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710326414.7A CN107727296A (en) | 2017-05-10 | 2017-05-10 | The method of testing of cylinder battery winding core inner stress |
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| CN107727296A true CN107727296A (en) | 2018-02-23 |
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| CN201710326414.7A Pending CN107727296A (en) | 2017-05-10 | 2017-05-10 | The method of testing of cylinder battery winding core inner stress |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208711A (en) * | 2019-05-15 | 2019-09-06 | 天津力神电池股份有限公司 | Method for pole piece stress condition in on-line testing cylindrical battery charge and discharge process |
| CN111610093A (en) * | 2020-05-27 | 2020-09-01 | 梅州市量能新能源科技有限公司 | Method for detecting tightness of lithium ion battery roll core |
| CN118248964A (en) * | 2024-05-27 | 2024-06-25 | 江苏中兴派能电池有限公司 | Design method and application of winding core |
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| CN106546365A (en) * | 2016-09-22 | 2017-03-29 | 北京空间飞行器总体设计部 | A kind of sun blanket pressure calibration method of flexible solar wing |
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| CN202256126U (en) * | 2011-09-23 | 2012-05-30 | 潍坊汇胜绝缘技术有限公司 | A clamp for testing interlayer engagement intensity of cardboards |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208711A (en) * | 2019-05-15 | 2019-09-06 | 天津力神电池股份有限公司 | Method for pole piece stress condition in on-line testing cylindrical battery charge and discharge process |
| CN110208711B (en) * | 2019-05-15 | 2021-04-16 | 天津力神电池股份有限公司 | Method for on-line testing stress condition of pole piece in charging and discharging processes of cylindrical battery |
| CN111610093A (en) * | 2020-05-27 | 2020-09-01 | 梅州市量能新能源科技有限公司 | Method for detecting tightness of lithium ion battery roll core |
| CN111610093B (en) * | 2020-05-27 | 2022-11-18 | 梅州市量能新能源科技有限公司 | Method for detecting tightness of lithium ion battery winding core |
| CN118248964A (en) * | 2024-05-27 | 2024-06-25 | 江苏中兴派能电池有限公司 | Design method and application of winding core |
| CN118248964B (en) * | 2024-05-27 | 2024-09-20 | 江苏中兴派能电池有限公司 | Design method and application of winding core |
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Application publication date: 20180223 |