CN114324011A - Pole piece flexibility testing device and method - Google Patents
Pole piece flexibility testing device and method Download PDFInfo
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- CN114324011A CN114324011A CN202210005735.8A CN202210005735A CN114324011A CN 114324011 A CN114324011 A CN 114324011A CN 202210005735 A CN202210005735 A CN 202210005735A CN 114324011 A CN114324011 A CN 114324011A
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- 238000012360 testing method Methods 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims description 4
- 238000007665 sagging Methods 0.000 abstract description 3
- 238000005452 bending Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The invention relates to a device and a method for testing flexibility of a pole piece, which comprises the following steps: the testing platform is obliquely arranged and provided with a pole piece pressing strip; the bottom plate, the bottom plate with test platform's one end links to each other, be provided with the support bar that supports on the bottom plate the test platform other end. One end of the pole piece is pressed on the test platform in the test, the other end of the pole piece sags, and the sagging degree is observed. The invention has simple structure and convenient operation, and can qualitatively evaluate the flexibility of the pole piece.
Description
Technical Field
The invention relates to the technical field of new energy batteries, in particular to a device and a method for testing flexibility of a pole piece.
Background
The development of modern society provides a wide space for the application development of rechargeable secondary batteries, and also puts higher demands on the secondary batteries, and it is expected that the rechargeable secondary batteries can have higher capacity, good safety, longer cycle life and the like.
The lithium ion battery is a secondary battery capable of being repeatedly charged and discharged, and is composed of main components such as a cathode and anode plate, an isolating membrane, electrolyte, mechanical parts and the like, wherein the material, the coating weight and the compaction density of the cathode and anode plate are important indexes influencing the capacity of a lithium ion core. Meanwhile, the flexibility of the battery pole piece is influenced by various factors such as raw materials, a coating process, a rolling process, a baking process and the like, and the electrode plates with different flexibilities are suitable for being produced by different types of sheet production processes so as to produce different types of lithium ion batteries. Poor pole piece of pliability influences the quality of coiling process on the one hand, leads to economic loss, and on the other hand is easy to be cracked and aluminium foil burr appears, and the diaphragm falls powder to influence the K value of electric core and even the security performance.
Currently, a universal detection device does not exist in the industry aiming at the flexibility of the pole piece, and the subjective judgment of people in the test process of the conventional detection device accounts for too large proportion; the standard error of quantization is large; the operation method is complex and inconvenient.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of complex operation and inconvenient judgment in the prior art, and provide a device and a method for testing the flexibility of a pole piece, which have simple structure and convenient use.
In order to solve the above technical problems, the present invention provides a device for testing flexibility of a pole piece, comprising:
the testing platform is obliquely arranged and provided with a pole piece pressing strip;
the bottom plate, the bottom plate with test platform's one end links to each other, be provided with the support bar that supports on the bottom plate the test platform other end.
In one embodiment of the invention, the bottom end of the test platform is provided with a lower baffle.
In an embodiment of the invention, the supporting rod is a telescopic rod, the top of the supporting rod is connected with a rotating pin clamp, the bottom plate is provided with an angle adjusting pin shaft, and two ends of the test platform are respectively connected with the adjusting pin shaft and the rotating pin clamp.
In one embodiment of the invention, an angle testing ruler is connected to a side edge of the upper end of the testing platform, and the angle testing ruler is perpendicular to the bottom plate.
In one embodiment of the invention, the distance between the pole piece pressing strip and the top of the test platform is 3 cm-6 cm.
In one embodiment of the invention, the included angle between the testing platform and the bottom plate is 20-45 degrees.
A pole piece flexibility test method adopts the test device and comprises the following steps:
fixing one end of the strip-shaped pole piece on the test platform, and enabling one end of the pole piece to extend out of and droop from the upper end of the test platform;
and grading the flexibility of the pole pieces according to the included angle between the tail end of the pole piece and the guide angle.
In one embodiment of the invention, the pole piece is a pole piece that is not rolled.
In one embodiment of the invention, the width of the pole piece is 1 cm-5 cm, the length of the pole piece is 15 cm-20 cm, and the length of the pole piece extending out of the test platform is 6 cm-8 cm.
In one embodiment of the invention, under the condition that the test plane inclines at the same angle, the pole pieces which have the same shape and the same fixing mode but different sag angles are wound, and the classification range is determined according to the winding result.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the testing device and the testing method provided by the invention have the advantages of simple structure and convenience in operation, and can qualitatively evaluate the flexibility of the pole piece.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an exploded view of the present invention;
fig. 3 is a side view of the present invention.
The specification reference numbers indicate: 10. a test platform; 11. pole piece layering; 12. a lower baffle plate; 13. an angle testing ruler;
20. a base plate; 21. a support bar; 22. adjusting the pin shaft; 23. rotating the pin holder; 24. and adjusting a knob.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1, fig. 2 and fig. 3, the overall structure of a device for testing flexibility of a pole piece according to the present invention is schematically illustrated. The test device of the present invention includes:
the testing platform 10 is obliquely arranged, and a pole piece pressing strip 11 is arranged on the testing platform 10;
the testing platform comprises a bottom plate 20, wherein the bottom plate 20 is connected with one end of the testing platform 10, and a supporting rod 21 for supporting the other end of the testing platform 10 is arranged on the bottom plate 20.
In this embodiment, the testing platform 10 is supported by the supporting rods 21 and is disposed obliquely with respect to the bottom plate 20. When the base plate 20 is placed on a horizontal surface, the test platform 10 is inclined with respect to the horizontal surface. When one end of the strip-shaped pole piece is fixed on the testing platform 10 and the other end extends out from the upper end of the testing platform 10, the part of the pole piece extending out of the testing platform 10 sags due to the action of gravity. Flexibility refers to the ability of a material to absorb energy and undergo plastic deformation before breaking, and thus the greater the flexibility, the less the bending strength, i.e., the greater the degree of bending. The pole piece is different because the base material of self is different, and the material of coating is different, and the weight of coating is different, and the roll-in density is different, and the degree of baking is different and has different pliability, and the degree of bending is related to the shape of material simultaneously, and consequently under the same condition of pole piece shape, the pliability of pole piece is better, and then the pole piece flagging degree is higher, and the pole piece pliability is worse, then the pole piece flagging degree is lower. Through providing a test platform 10 that can hang down for the pole piece, conveniently observe the flagging degree of pole piece to judge the pliability of pole piece, need not other application of force mechanisms, testing arrangement simple structure, and only need fixed pole piece, convenient operation.
As a preferred embodiment of the present invention, a lower baffle 12 is installed at the bottom end of the test platform 10. The bending performance of the material is related to the shape of the material, and in order to ensure that the test conditions of each pole piece are the same, the pole pieces are required to be cut into the same shape. During the test simultaneously for the size that the pole piece was fixed on test platform 10 and the size that stretches out test platform 10 are all the same, and a setpoint is drawn together on test platform 10 in the setting of lower baffle 12, and baffle 12 under the equal butt of tip when the pole piece, because pole piece length is the same, consequently also can guarantee that the pole piece stretches out test platform 10's length is the same. The operation steps are further simplified, and good test consistency can be ensured. In this embodiment, the test platform 10 is provided with a mounting hole, and the lower baffle 12 is provided with a protruding block inserted into the mounting hole, so as to facilitate the installation of the lower baffle 12.
As a preferred embodiment of the present invention, in order to conveniently adjust the inclination angle of the testing platform 10, the supporting rod 21 is a telescopic rod, the top of the supporting rod 21 is connected to a rotating pin clamp 23, the bottom plate 20 is provided with an angle adjusting pin 22, and two ends of the testing platform 10 are respectively connected to the adjusting pin 22 and the rotating pin clamp 23.
Specifically, in this embodiment, the side of the supporting rod 21 is provided with an adjusting knob 24, and the expansion of the supporting rod 21 is controlled by the adjusting knob 24. The top of bracing piece 21 is provided with the hinge platform, and rotatory round pin presss from both sides 23 fixed mounting at test platform 10 lower surface, and the hinge platform inserts rotatory round pin and presss from both sides 23 in, and hinge platform and rotatory round pin clamp 23 are fixed to the bolt. The bottom plate 20 is provided with a mounting groove, the adjusting pin shaft 22 is provided with an inserting shaft, and the inserting shaft is inserted into the mounting groove, so that the installation is convenient. The end of the testing platform 10 extends to form a hinge block, the hinge block is inserted into the adjusting pin 22, and the hinge block and the adjusting pin 22 are fixed by a bolt. The rotation of the test platform 10 relative to the base plate 20 and the support bar 21 is realized.
As a preferred embodiment of the present invention, an angle measuring ruler 13 is connected to a side edge of an upper end of the testing platform 10, and the angle measuring ruler 13 is perpendicular to the bottom plate 20. Thereby being convenient for directly reading the included angle between the tail end of the pole piece and the guide angle. The lead angle is the position where the pole piece extends out of the test platform 10, i.e. the upper end of the test platform 10. In this embodiment, since the angle of the testing platform 10 is adjusted, the included angle between the end of the pole piece and the vertical direction is selected as the judgment standard.
As a preferred embodiment of the invention, the distance between the pole piece batten 11 and the top of the test platform 10 is 3 cm-6 cm. If the pole piece pressing strip 11 is too close to the top of the test platform 10, that is, the pole piece pressing strip 11 is too close to the guide angle position of the pole piece, the pole piece cannot be bent at the guide angle position due to the clamping of the pole piece pressing strip 11 and the test platform 10. If the pole piece is too far from the lead angle position, there is a high probability that the pole piece will begin to bend at a position before the lead angle. According to the test, the pole piece pressing strip 11 in the embodiment is selected to press the pole piece at a position 5cm away from the top of the test platform 10.
As a preferred embodiment of the present invention, the included angle between the testing platform 10 and the bottom plate 20 is 20 ° to 45 °. When the test platform 10 is closer to the vertical direction, the bending amplitude of the pole piece is larger, and for easily distinguishing the bending degree of the pole piece, the maximum included angle of the test platform 10 is set to be 45 degrees in this embodiment. When the angle of the test platform 10 is smaller, on one hand, the distance between the top of the test platform 10 and the bottom plate 20 is smaller, which affects the sagging of the pole piece, and on the other hand, the included angle between the tail end of the pole piece and the guide angle is not easy to measure if the height is low. The minimum included angle of the test platform 10 in this embodiment is set to 20 °. The inclination of the test platform 10 in this embodiment is set to 30 ° as the most preferred option.
A pole piece flexibility test method adopts the test device and comprises the following steps:
fixing one end of the strip-shaped pole piece on the test platform 10, and enabling one end of the pole piece to extend out of and droop from the upper end of the test platform 10;
and grading the flexibility of the pole pieces according to the included angle between the tail end of the pole piece and the guide angle.
The invention only needs to fix the pole piece, the degree of pole piece sagging caused by the self gravity of the pole piece is the test result of the invention, the operation is simple, the result is visual, and the flexibility of the pole piece can be qualitatively evaluated.
Since the degree of bending of the material is shape dependent, the shape of the pole piece being tested is cut to be consistent with the angle of the test platform 10 being fixed.
And because the pole piece is already bent to a certain extent after being wound, when the device is used for testing the bent pole piece, the obtained test result is inaccurate, and therefore, the pole piece adopted in the invention is the pole piece which is not wound after being rolled.
Because the strip shape is easy to sag and bend when one end of the strip is suspended, the width of the pole piece is 1 cm-5 cm, the length of the pole piece is 15 cm-20 cm, and the length of the pole piece extending out of the test platform 10 is 6 cm-8 cm. When the width of the pole piece is 1cm, the width of the pole piece is narrow, the pole piece is easy to bend, the difference of the bending degree of different pole pieces is small, and the pole pieces are not easy to distinguish. When the pole piece width was 5cm, the pole piece width broad, the pole piece is inflexible this moment, and different pole pieces all are in the perk state, are not convenient for distinguish the pole piece equally. When the pole piece is bent, the tail end of the pole piece is still a straight line for the bent part at one end, and the accurate grading angle can be obtained at the moment. When the extension length of the pole piece is longer, the gravity of the pole piece at the suspended part is larger, the drooping degree of the pole piece is larger, the angle is too close, and the pole piece is not easy to distinguish. When the extension length of the pole piece is short, the pole piece has no straight line part after bending, and the accurate bending angle of the pole piece cannot be obtained. The extended length of the pole piece in this embodiment can distinguish different pole pieces, and the portion on the testing platform 10 is conveniently fixed.
As a preferred implementation of the present invention, one pole piece may be tested at a time, or multiple pole pieces may be tested simultaneously. Because the test result only obtains the flexibility result of the tested pole piece, whether the pole piece is wound by the battery cannot be directly obtained. Therefore, when the pole pieces having the same shape but different sag angles are wound while the test platform 10 is inclined at the same angle, the test conditions of the pole pieces are the same, and thus the pole pieces can be compared with each other. And finally determining the grading range according to the winding result.
Examples
The test conditions comprise the inclination angle of the test platform, the length of the pole piece and the extension length of the pole piece, and the test result is the proportion of the pole piece in all the pole pieces in the included angle range of the tail end of the pole piece and the guide angle position/the proportion of the pole piece in the range, which can be wound and has no crack.
According to the test result, under the conditions that the included angle between the test platform and the bottom plate is 30 degrees, the length of the pole pieces is 18cm, and the extension length is 8cm, the distinguishing degree between the pole pieces is most obvious, and the winding condition after grading is better.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A pole piece flexibility testing device is characterized by comprising:
the testing platform is obliquely arranged and provided with a pole piece pressing strip;
the bottom plate, the bottom plate with test platform's one end links to each other, be provided with the support bar that supports on the bottom plate the test platform other end.
2. The device for testing the flexibility of the pole piece according to claim 1, wherein the bottom end of the testing platform is provided with a lower baffle.
3. The device for testing the flexibility of the pole piece according to claim 1, wherein the supporting rod is a telescopic rod, a rotating pin clamp is connected to the top of the supporting rod, an angle adjusting pin shaft is installed on the bottom plate, and two ends of the testing platform are respectively connected with the adjusting pin shaft and the rotating pin clamp.
4. The device for testing the flexibility of the pole piece according to claim 1, wherein an angle testing ruler is connected to a side edge of the upper end of the testing platform, and the angle testing ruler is perpendicular to the bottom plate.
5. The device for testing the flexibility of the pole piece according to claim 1, wherein the distance between the pole piece pressing strip and the top of the test platform is 3 cm-6 cm.
6. The device for testing the flexibility of the pole piece according to claim 1, wherein an included angle between the testing platform and the bottom plate is 20-45 °.
7. A pole piece flexibility testing method is characterized in that the testing device according to any one of claims 1 to 6 is adopted, and the method comprises the following steps:
fixing one end of the strip-shaped pole piece on the test platform, and enabling one end of the pole piece to extend out of and droop from the upper end of the test platform;
and grading the flexibility of the pole pieces according to the included angle between the tail end of the pole piece and the guide angle.
8. The method for testing the flexibility of the pole piece according to claim 7, wherein the pole piece is not rolled.
9. The method for testing the flexibility of the pole piece according to claim 7, wherein the width of the pole piece is 1 cm-5 cm, the length of the pole piece is 15 cm-20 cm, and the length of the pole piece extending out of the test platform is 6 cm-8 cm.
10. The method for testing the flexibility of the pole piece according to claim 7, wherein the pole piece with the same shape and the same fixing mode but different sag angles is wound under the condition that the test plane is inclined at the same angle, and the grading range is determined according to the winding result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210005735.8A CN114324011A (en) | 2022-01-04 | 2022-01-04 | Pole piece flexibility testing device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210005735.8A CN114324011A (en) | 2022-01-04 | 2022-01-04 | Pole piece flexibility testing device and method |
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