CN109187190B - Tensile property testing method for lithium battery foil - Google Patents
Tensile property testing method for lithium battery foil Download PDFInfo
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- CN109187190B CN109187190B CN201811180394.8A CN201811180394A CN109187190B CN 109187190 B CN109187190 B CN 109187190B CN 201811180394 A CN201811180394 A CN 201811180394A CN 109187190 B CN109187190 B CN 109187190B
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- 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
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- 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
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- 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
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a tensile resistance test method of a lithium battery foil, which tests the tensile resistance of the foil in the direction vertical to the plane by simulating the stress state of copper foil and aluminum foil in the actual use of a lithium battery, and improves the accuracy and effectiveness of raw material evaluation.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing and raw material evaluation, in particular to a tensile property testing method of a lithium battery foil.
Background
The tensile strength and the elongation of the existing copper foil and aluminum foil for the lithium ion battery are obtained by using a conventional multifunctional tensile testing machine to stretch along the longitudinal direction or the transverse direction, but the testing method has certain limitation and cannot reflect the stress states of the copper foil and the aluminum foil in the practical use process of the cylindrical lithium ion battery because: after the battery is charged, the thickness of the pole piece is increased, the diameter of the roll core is increased, under the condition, the copper foil and the aluminum foil bear tensile stress along the tangential direction and also bear shearing force at the edge of a pole lug and the edge of the head and the tail of the pole piece along the radial direction, the conventional test method can only evaluate the tangential tensile resistance of the foil, and cannot evaluate the radial shear resistance of the foil.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for testing the tensile resistance of a lithium battery foil against the defects of the prior art, and the method can be used for improving the evaluation accuracy and effectiveness of the lithium battery copper foil and the lithium battery aluminum foil.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a tensile resistance testing method of a lithium battery foil comprises the following steps:
step 1) cutting a foil into strip shapes, horizontally clamping the cut foil on two groups of fixed chucks in a tensile testing machine, and placing a movable testing rod in the middle of the fixed chucks at two ends;
step 2) starting the test according to the test conditions, and moving the test rod to move slowly in the vertical direction according to the set parameters until the foil is broken;
a tension sensor and a distance sensor are arranged on the movable testing rod and used for testing the tensile force and the tensile stroke, and the central distance of the fixed chuck is specified as a testing gauge length;
during stretching, the foil being tested is brought into contact with the corners of the moving test barThe position bears the shearing acting force F vertical to the surface of the foil, and the maximum value of the shearing acting force F is taken as the maximum shearing stress F borne by the measured foil when the foil is brokenmax；
The initial gauge length of the foil in the stretching process is l0The stroke of the movable test rod in the stretching process is S, and the stretched foil material is long
From this, the elongation of the foil can be determined
Maximum shear stress F obtained by the above testmaxAnd the elongation delta is used for representing the tensile resistance of the lithium battery foil.
In the technical scheme, the horizontal distance between the two groups of fixed chucks is 150 +/-0.1 mm according to the test conditions, and the vertical movement speed of the movable test rod is 50 mm/min.
In the technical scheme, the testing temperature is 25 +/-5 ℃.
In the technical scheme, the cutting specification of the foil is a rectangle with the length of 200 +/-5 mm and the width of 15 +/-0.5 mm.
In the technical scheme, the cross section of the movable test rod simulates the shape of the stress state of the foil in the battery.
In the technical scheme, the cross section of the movable testing rod is rectangular, and the width of the cross section of the movable testing rod is 1-10 mm.
Among the above-mentioned technical scheme, the edges and corners of removal test bar contain the chamfer and do not chamfer in order to simulate chamfer utmost point ear respectively with do not chamfer utmost point ear.
In the above technical scheme, the foil is a copper foil or an aluminum foil.
The invention has the beneficial effects that: the tensile resistance of the foil in the direction perpendicular to the plane is tested by simulating the stress state of the foil in the practical use of the lithium battery, and the accuracy and effectiveness of raw material evaluation are improved.
Drawings
FIG. 1 is a schematic diagram of a testing process of the present invention;
FIG. 2 is a schematic view of the foil material being stressed during stretching according to the present invention;
figure 3 is a schematic representation of the deformation of a foil during stretching according to the invention.
In the figure, 1, a fixed chuck; 2. a foil material; 3. moving the test rod; 4. and (6) corner angles.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-3, a method for testing tensile resistance of a lithium battery foil includes the following steps:
step 1) cutting the foil into strip shapes, for example, cutting rectangles with the specification of 200 +/-5 mm in length and 15 +/-0.5 mm in width, horizontally clamping the cut foil on two groups of fixed chucks in a tensile testing machine, and placing a movable testing rod in the middle of the fixed chucks at two ends;
step 2) according to the test conditions: the horizontal distance between the two groups of fixed chucks is 150 +/-0.1 mm, the vertical moving speed of the movable test rod is 50mm/min, and the test temperature is 25 +/-5 ℃; and starting the test, and moving the test rod to slowly move towards the vertical direction according to the set parameters until the foil is broken.
In the steps, a tension sensor and a distance sensor are arranged on the movable testing rod and used for testing the tensile force and the tensile stroke, and the central distance of the fixed chuck is specified as a testing gauge length;
in the stretching process, the contact position of the edges and corners of the foil to be tested and the movable testing rod bears the shearing acting force F vertical to the surface of the foil, the value of the shearing acting force F is approximately equal to the upward tensile force of the movable testing rod, and the maximum value of the shearing acting force F is taken as the maximum shearing stress F borne by the foil to be tested when the foil is brokenmax；
The foil material in the stretching process is approximately isosceles triangle with the horizontal plane, and the initial gauge length of the foil material is l0The stroke of the movable test rod in the stretching process is S, and the stretched foil material is long
From this, the elongation of the foil can be determined
Maximum shear stress F obtained by the above testmaxAnd the elongation delta is used for representing the tensile resistance of the lithium battery foil.
Wherein, the shape of the cross section of the movable test rod simulates the shape of the stressed state of the foil in the battery. The cross section of the movable test rod is rectangular, and the width of the cross section of the movable test rod is 1-10 mm. The corners of the mobile test bar contain chamfers and no chamfers to simulate chamfered and un-chamfered tabs, respectively.
The foil material of the present invention is generally referred to as copper foil or aluminum foil in the actual lithium battery manufacturing process.
The above examples are intended to illustrate rather than to limit the invention, and all equivalent changes and modifications made by the methods described in the claims of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A tensile property testing method of a lithium battery foil is characterized by comprising the following steps:
step 1) cutting a foil into strip shapes, horizontally clamping the cut foil on two groups of fixed chucks in a tensile testing machine, and placing a movable testing rod in the middle of the fixed chucks at two ends;
step 2) starting the test according to the test conditions, and moving the test rod to move slowly in the vertical direction according to the set parameters until the foil is broken;
a tension sensor and a distance sensor are arranged on the movable testing rod and used for testing the tensile force and the tensile stroke, and the central distance of the fixed chuck is specified as a testing gauge length;
in the stretching process, the corner contact position of the tested foil and the movable testing rod bears the shearing acting force F vertical to the surface of the foil, and the maximum value of the shearing acting force F is used as the maximum shearing stress F borne by the tested foil when the foil is brokenmax；
Foil initiation during stretchingA gauge length of l0The stroke of the movable test rod in the stretching process is S, and the stretched foil material is long
From this, the elongation of the foil can be determined
Maximum shear stress F obtained by the above testmaxAnd the elongation delta is used for representing the tensile resistance of the lithium battery foil.
2. The method for testing the tensile property of the lithium battery foil material as claimed in claim 1, wherein the method comprises the following steps: the horizontal distance between the two groups of fixed chucks is 150 +/-0.1 mm according to the test conditions, and the vertical moving speed of the movable test rod is 50 mm/min.
3. The method for testing the tensile property of the lithium battery foil material as claimed in claim 2, wherein the method comprises the following steps: the test temperature was 25. + -. 5 ℃.
4. The method for testing the tensile property of the lithium battery foil material as claimed in claim 1, wherein the method comprises the following steps: the cutting specification of the foil is a rectangle with the length of 200 plus or minus 5mm and the width of 15 plus or minus 0.5 mm.
5. The method for testing the tensile property of the lithium battery foil material as claimed in claim 1, wherein the method comprises the following steps: the cross section of the movable test rod simulates the shape of a foil in a battery in a stress state.
6. The method for testing the tensile property of the lithium battery foil material as claimed in claim 5, wherein the method comprises the following steps: the cross section of the movable test rod is rectangular, and the width of the cross section of the movable test rod is 1-10 mm.
7. The method for testing the tensile property of the lithium battery foil material as claimed in claim 6, wherein the method comprises the following steps: the edges and corners of the movable test rod contain chamfers and are not chamfered so as to simulate chamfered lugs and non-chamfered lugs respectively.
8. The method for testing the tensile property of the lithium battery foil material as claimed in claim 1, wherein the method comprises the following steps: the foil is copper foil or aluminum foil.
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| CN201811180394.8A CN109187190B (en) | 2018-10-10 | 2018-10-10 | Tensile property testing method for lithium battery foil |
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| CN201811180394.8A CN109187190B (en) | 2018-10-10 | 2018-10-10 | Tensile property testing method for lithium battery foil |
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| CN109187190B true CN109187190B (en) | 2021-04-20 |
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| CN112630021B (en) * | 2020-11-25 | 2023-05-30 | 惠州亿纬锂能股份有限公司 | Test method for battery cell sleeve label |
| CN113720685B (en) * | 2021-09-01 | 2023-07-21 | 苏州科技大学 | Foil plastic partitioning method based on digital image correlation analysis |
| CN115165535B (en) * | 2022-07-07 | 2023-06-16 | 江西京九电源（九江）有限公司 | Lead belt tension testing tool |
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| US5237876A (en) * | 1992-07-29 | 1993-08-24 | Martin Marietta Energy Systems, Inc. | Apparatus for tensile testing plate-type ceramic specimens |
| CN101819113B (en) * | 2010-04-19 | 2012-09-05 | 攀钢集团钢铁钒钛股份有限公司 | Side bend test method |
| CN104764662B (en) * | 2015-04-15 | 2018-03-13 | 东莞市创明电池技术有限公司 | A kind of method verified lithium ion battery and use aluminium foil performance |
| KR101649451B1 (en) * | 2015-10-21 | 2016-08-18 | 정재성 | Universal testing machine with muti-axis |
| CN105928801B (en) * | 2016-04-25 | 2019-01-18 | 东莞市创明电池技术有限公司 | Foil shearing force testing method and test device |
| CN207336229U (en) * | 2017-08-30 | 2018-05-08 | 中航锂电（江苏）有限公司 | Foil tensile test special fixture in a kind of lithium battery |
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Non-Patent Citations (1)
| Title |
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| 覆铜箔层压板拉伸变形及卷曲性能的研究;赵 勇等;《绝缘材料》;20141231;第47卷(第6期);第103-107页 * |
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