A device for testing the flexibility of a lithium-ion battery pole piece

Abstract

The utility model discloses a kind of lithium ion battery pole piece flexibility testing device, belong to lithium battery technical field, including workstation pedestal, supporting plate, positioning column, telescopic component and the protractor of cooperation and use;The one end of workstation pedestal is connected with the bottom of supporting plate, positioning column is movably connected in the top of supporting plate, one end of telescopic component is connected with positioning column, and the other end is slidably connected along the length direction of workstation pedestal;When pole piece is tested, gap is left between positioning column and supporting plate.The beneficial effects of the utility model are: simple structure, convenient to use, applicable to different pole piece thickness and can be quantified, and test precision is high.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion batteries, and more particularly to a lithium-ion electrode flexibility performance testing device. Background Technology

[0002] Lithium-ion batteries, as a promising energy storage technology, have been widely used in mobile phones, laptops, electric vehicles, and hybrid vehicles. In the manufacturing process of power batteries, electrodes undergo processes such as slitting, hot pressing, winding, or stacking. Electrodes with poor flexibility are prone to burrs, cracks, or breakage during these processes, leading to decreased yield and increased production costs. In terms of safety, electrodes with poor flexibility are more likely to break under mechanical impact, potentially causing internal short circuits and safety issues. In terms of performance, if the electrode has poor flexibility, it is prone to cracking or breaking under stress, resulting in poor contact between the active material and the current collector, increasing internal resistance, and ultimately shortening the battery's cycle life. Therefore, accurately assessing the flexibility of the electrodes is a crucial step in the power battery manufacturing process.

[0003] Existing methods for assessing the flexibility of battery electrodes involve directly holding both ends of the rolled electrode and folding it 180 degrees, then observing whether the folded electrode breaks or allows light to pass through. This method relies too heavily on subjective human judgment and cannot be quantified.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to solve the problem that the current test of electrode flexibility is a manual test, which cannot be quantified and results in large errors.

[0006] This utility model solves the above-mentioned technical problems through the following technical means:

[0007] A lithium-ion electrode flexibility performance testing device includes a worktable base, a support plate, a positioning post, a telescopic assembly, and a protractor used in conjunction with it; one end of the worktable base is connected to the bottom end of the support plate, the positioning post is movably connected to the top of the support plate, one end of the telescopic assembly is connected to the positioning post, and the other end is slidably connected along the length of the worktable base; during electrode testing, a gap is left between the positioning post and the support plate.

[0008] This utility model discloses a lithium-ion electrode flexibility performance testing device. It quantifies the flexibility performance of the electrode by using a protractor. When the electrode breaks, it stops the sliding of the telescopic component and the worktable base in time, which can accurately locate the exact position of the electrode breakage. It has high testing accuracy, simple structure, convenient use and applicable to different electrode thicknesses.

[0009] Preferably, at least one guide rail is connected to the top surface of the worktable base along its length, and the guide rail is slidably connected to the slider; the other end of the telescopic component is movably connected to the slider.

[0010] The guide rail and slider provide guidance, ensuring that the telescopic components slide in the same direction and are subjected to uniform force.

[0011] Preferably, the support plate and the workbench base are arranged at an angle, and the length direction of the workbench base and the height direction of the support plate are marked.

[0012] In this embodiment, a protractor is used to measure the bending angle during electrode testing, and the scale on the workbench base is used to measure the distance to quantify the flexibility of the electrode; the scale on the support plate is mainly used to locate the position of the electrode.

[0013] Preferably, two mounting plates are connected to the support plate, and mounting holes are provided on the mounting plates. The mounting shafts at both ends of the positioning column are connected to the mounting holes.

[0014] Preferably, the mounting hole is an oblong hole, with the end of the oblong hole closer to the support plate being the first station and the end of the oblong hole farther from the support plate being the second station; during electrode testing, the positioning post is located at the first station, and when not being tested, the positioning post is located at the second station.

[0015] Preferably, it also includes an elastic element, the mounting hole is an oblong hole, one end of the elastic element is connected to the mounting shaft, and the other end is connected to the mounting shaft, forcing the positioning post to fit tightly against the support plate.

[0016] Preferably, it also includes an elastic element, the mounting hole is an oblong hole, the end of the mounting plate away from the support plate is bent to one side, one end of the elastic element is connected to the support plate, and the other end is connected to the bent part of the mounting plate, forcing the positioning post to fit tightly against the support plate.

[0017] When the lithium-ion electrode flexibility performance testing device is not in use, the elastic element pulls or abuts against the positioning post, forcing the outer cylindrical surface of the positioning post to be in close contact with the support plate. When the lithium-ion electrode flexibility performance testing device needs to be used to test the electrode, external force is used to move the positioning post away from the support plate, leaving a gap, through which the electrode can pass. Once the position of the electrode is determined, the positioning post is released. Under the action of the elastic element, the positioning post can press the electrode, making the electrode close to the support plate, so that the angle of the electrode breakage measured by the protractor is more accurate.

[0018] Preferably, the mounting hole is an oblong hole, with both ends of the oblong hole extending outward along the height direction to form a locking groove. During electrode testing, the positioning post is engaged in the locking groove close to the support plate, and when not being tested, the positioning post is engaged in the locking groove away from the support plate.

[0019] The slot design also allows for pressing the electrode firmly during electrode testing, ensuring the electrode is tightly attached to the support plate and improving measurement accuracy.

[0020] Preferably, the telescopic assembly includes an inclined plate, a telescopic plate, and a locking knob. The top end of the inclined plate is fixedly connected to the outer surface of the positioning column, and a slot is opened at the other end of the inclined plate. One end of the telescopic plate is inserted into the slot of the inclined plate, and the other end is slidably connected to the workbench base.

[0021] The telescopic component allows the electrode sheets to be bent more flexibly.

[0022] Preferably, it also includes a first pressure plate and a second pressure plate, wherein the first pressure plate is detachably connected to the support plate and the second pressure plate is detachably connected to the top surface of the telescopic component.

[0023] The first pressure plate can be connected to the support plate by bolts, magnets, or straps, while the second pressure plate can be connected to the inclined plate by bolts, magnets, or straps. This indirect method of fixing the electrode reduces the problem of residual glue when using adhesive coating on the electrode.

[0024] Preferably, the zero point of the protractor coincides with the central axis when the positioning post presses against the electrode. This is for more accurate measurements.

[0025] The advantages of this utility model are:

[0026] The lithium-ion electrode flexibility performance testing device of this invention has a simple structure, is easy to use, is applicable to different electrode thicknesses and can be quantified; and when the electrode breaks, it can stop the sliding of the telescopic component and the worktable base in time, accurately locate the exact position of the electrode breakage, and has high testing accuracy. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the lithium-ion electrode flexibility performance testing device according to an embodiment of this utility model;

[0028] Figure 2 This is a partial schematic diagram of the positioning post in an embodiment of this utility model;

[0029] Figure 3 This is a partial schematic diagram of the positioning post in an embodiment of this utility model;

[0030] Figure 4 This is a schematic diagram of the operation of the lithium-ion electrode flexibility performance testing device according to an embodiment of this utility model. Figure 1 ;

[0031] Figure 5 This is a schematic diagram of the operation of the lithium-ion electrode flexibility performance testing device according to an embodiment of this utility model. Figure 2 ;

[0032] Figure 6 This is a schematic diagram of the connection of the positioning column in an embodiment of this utility model;

[0033] Figure 7 This is a schematic diagram of the connection of the positioning column in an embodiment of this utility model;

[0034] Figure 8 This is a schematic diagram of the connection of the positioning column in an embodiment of this utility model;

[0035] Figure 9 This is a schematic diagram of the connection of the positioning column in an embodiment of this utility model;

[0036] Figure 10 This is a schematic diagram of the card slot in an embodiment of this utility model;

[0037] Numbering on the map:

[0038] 1. Workbench base; 11. Guide rail; 12. Slider;

[0039] 2. Support plate; 21. Mounting plate; 22. Oblong hole; 23. Elastic element; 24. Locking groove

[0040] 3. Positioning pin; 31. Mounting shaft;

[0041] 4. Telescopic assembly; 41. Inclined plate; 42. Telescopic plate; 43. Locking knob;

[0042] 5. Protractor;

[0043] 6. Electrode film;

[0044] 7. First pressure plate;

[0045] 8. Second pressure plate. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0047] Example 1:

[0048] like Figure 1As shown, a lithium-ion electrode flexibility performance testing device includes a worktable base 1, a support plate 2, a positioning post 3, a telescopic assembly 4, and a protractor 5 used in conjunction with it. One end of the worktable base 1 is connected to the bottom side of the support plate 2, the positioning post 3 is rotatably connected to the top side of the support plate 2, the circumferential surface of the positioning post 3 is fixedly connected to one end of the telescopic assembly 4, and the other end of the telescopic assembly 4 is rotatably connected to the slider 12 on the worktable base 1. The telescopic assembly 4 extends or shortens as the slider 12 slides horizontally on the guide rail 11. Thus, the worktable base 1, the support plate 2, and the telescopic assembly 4 form a triangular structure, and when the electrode 6 is measured, a gap is left between the positioning post 3 and the support plate 2 to facilitate the passage of the electrode 6.

[0049] Specifically, the workbench base 1 is a horizontally positioned rectangular plate. Scales are set along the length of the workbench base 1 to facilitate reading the distance between the slider 12 and the support plate 2 when the electrode 6 breaks. Along the length of the workbench base 1, two guide rails 11 are connected to the top surface of the workbench base 1. The two guide rails 11 are arranged in parallel and perpendicular to the support plate 2 in space. The slider 12 slides along the guide rails 11, allowing it to reciprocate horizontally. In this embodiment, the guide rails 11 and slider 12 provide guidance, ensuring that the telescopic assembly 4 slides in the same direction and receives uniform force.

[0050] This embodiment is not limited to the shape of the vertical cross-section of the guide rail 11 and the slider 12. For example, the guide rail 11 can be an inverted T-shaped structure, and the slider 12 can be matched accordingly. The cross-section of the guide rail 11 can also be a dovetail groove, a rectangle, or other structures. In this embodiment, the slider 12 is an integral structure, with the bottom ends of both ends of the slider 12 slidably connected to the guide rail 11. Alternatively, it can be two small sliders, each connected to the guide rail 11, and both small sliders are connected to the other end of the telescopic component 4.

[0051] In this embodiment, the support plate 2 is a rectangular plate, and the support plate 2 is arranged perpendicularly to the workbench base 1, that is, the angle between the support plate 2 and the workbench base 1 is 90 degrees. This embodiment is not limited to the angle between the support plate 2 and the workbench base 1; the support plate 2 can also be arranged at an angle to the workbench base 1, typically 60-120 degrees. However, to ensure that the tilt angle of the support plate 2 meets the requirements for breaking and for ease of reading distance values, it is preferred that the support plate 2 and the workbench base 1 be arranged perpendicularly. Regardless of whether it is arranged vertically or at an angle, the measuring side of the protractor 5 is parallel to the side of the support plate 2 to obtain the angle of the electrode 6 when bent. Scale lines are also provided on the side of the support plate 2 connecting to the workbench base 1 to facilitate obtaining the installation position of the electrode 6.

[0052] like Figure 2As shown, the positioning post 3 has a cylindrical structure. Two mounting plates 21 are fixed to the top side of the support plate 2 at intervals. Mounting holes are provided on the mounting plates 21. The mounting shafts 31 at both ends of the positioning post 3 are clearance-fitted with the mounting holes, so that the two ends of the positioning post 3 are rotatably connected to the mounting plates 21 through the mounting shafts 31. In this embodiment, the mounting holes are circular holes. (See also...) Figure 3 As shown, there is a gap between the positioning post 3 and the support plate 2, which is used for the electrode 6 to pass through. The radius of the positioning post 3 should not be too large, and is 5mm.

[0053] The telescopic assembly 4 includes an inclined plate 41, a telescopic plate 42, and a locking knob 43. The top end of the inclined plate 41 is fixedly connected to the outer surface of the positioning post 3, and a slot is formed at the other end of the inclined plate 41. One end of the telescopic plate 42 is inserted into the slot of the inclined plate 41, and the other end of the telescopic plate 42 is rotatably connected to the top surface of the slider 12. In this embodiment, both the inclined plate 41 and the telescopic plate 42 are rectangular plates. The width and thickness of the telescopic plate 42 are adapted to the width and thickness of the slot of the inclined plate 41, so that the telescopic plate 42 can be inserted into the inclined plate 41 and extend and retract along its length. The locking knob 43 is screwed in along the thickness direction of the inclined plate 41 and can abut against the telescopic plate 42. At this time, the telescopic plate 42 and the inclined plate 41 cannot move relative to each other.

[0054] To improve the flexibility of the telescopic plate 42 when it moves, the bottom of the telescopic plate 42 is a semi-circular rotating rod, and a semi-circular rotating groove is opened on the top surface of the slider 12. The two ends of the semi-circular rotating groove are connected to the rotating brackets, and the two ends of the semi-circular rotating rod are inserted into the rotating brackets and can be rotated.

[0055] After the symmetrical plane of the inclined plate 41 is extended, it can pass through the central axis of the positioning post 3. The top and bottom surfaces of the inclined plate 41 are nearly tangent to the circumference of the positioning post 3, so that the electrode 6 can be as close as possible to the inclined plate 41, thereby improving the measurement accuracy.

[0056] This embodiment is applicable to electrode 6 with a length of 6-16cm, a width of 5-11cm, and a thickness of 100-200μm.

[0057] In this embodiment, the protractor 5 can be directly fixed to the support plate 2. The "0" mark of the protractor 5 coincides with the axis of the position where the positioning post 3 presses the electrode 6, and the measuring edge of the protractor 5 is aligned with the support plate 2. Alternatively, the protractor 5 can be left unfixed; it can simply be removed for measurement when the electrode 6 breaks. This embodiment uses a fixed setting for the protractor 5 to ensure measurement consistency and reduce errors caused by having to set up the protractor 5 for each measurement.

[0058] like Figure 4 , Figure 5As shown, in this embodiment, when testing the flexibility of electrode 6, the electrode 6 is kept in a natural vertical state along the support plate 2. Glue is applied to one end of the electrode 6 and it is bonded to the bottom of the electrode. The electrode 6 passes through the gap between the positioning post 3 and the support plate 2. The positioning post 3 presses down on the electrode 6. After the electrode 6 is bent, glue is applied to the other end and it is fixed on the inclined plate 41. At this time, the locking knob 43 is adjusted to the loose state, and the inclined plate 41 and the telescopic plate 42 are in a movable state. By pushing the slider 12 closer to the support plate 2, the angle of the electrode 6 changes, and the included angle of the electrode 6 gradually decreases until the electrode 6 breaks and powder falls off, at which point the pushing stops. The locking knob 43 is adjusted to the locked state, and the scale of the corresponding position of the slider 12 on the workbench base 1 and the angle of the inclined plate 41 are read.

[0059] Three to five pieces can be selected from the same group of samples for testing to ensure the reliability of the results.

[0060] When the electrode 6 breaks, the smaller the angle between the inclined plate 41 and the support plate 2, the closer the slider 12 is to the support plate 2, indicating that the electrode 6 has better flexibility; conversely, the smaller the angle between the inclined plate 41 and the support plate 2, the worse the flexibility.

[0061] The lithium-ion electrode flexibility testing device of this embodiment has a simple structure, is easy to use, and is applicable to electrode flexibility testing of different thicknesses and can be quantified. Furthermore, when electrode 6 breaks, the slider 12 is stopped in time, allowing for accurate location of the breakage position. Compared to the prior art where electrode 6 is directly broken manually, due to inertia, the angle at the moment the hand stops applying force may not be the true angle at the instant of breakage, resulting in a larger error.

[0062] Example 2:

[0063] like Figure 4 , Figure 5 As shown in this embodiment, a lithium-ion electrode flexibility performance testing device further includes a first pressure plate 7 and a second pressure plate 8. The first pressure plate 7 can be connected to the support plate 2 by bolts, magnets, or straps, while the second pressure plate 8 can be connected to the inclined plate 41 by bolts, magnets, or straps.

[0064] When the first pressure plate 7 is connected to the support plate 2 by bolts, bolt holes are provided on both the first pressure plate 7 and the support plate 2. When a flexibility test is required for the electrode 6, the first pressure plate 7 presses one end of the electrode 6 onto the support plate 2 and locks it in place with bolts. When the first pressure plate 7 is connected to the support plate 2 by magnetic attraction, magnets can be embedded inside both the first pressure plate 7 and the support plate 2. When a flexibility test is required for the electrode 6, the first pressure plate 7 presses one end of the electrode 6 firmly onto the support plate 2 by magnetic attraction. When the first pressure plate 7 is connected to the support plate 2 by strapping, the first pressure plate 7 presses the electrode 6 onto the support plate 2 and then secures it by wrapping multiple turns of strapping. The second pressure plate 8 can be connected using the same method, and will not be described in detail here.

[0065] The first pressure plate 7 and the second pressure plate 8 can be transparent pressure plates, making it easy to observe the position of the electrode 6.

[0066] The first pressure plate 7 can be left unconnected to the support plate 2 when not in use, and is only fixed to the support plate 2 by bolts, magnets, or straps when in use.

[0067] Alternatively, the bottom or side of the first pressure plate 7 is hinged to the support plate 2. When it is necessary to press the electrode 6, it is flipped up or to the side to press the electrode 6, and then fixed by bolts, magnets, or straps.

[0068] Directly attaching the electrode 6 to the support plate 2 with adhesive will leave adhesive residue on the support plate 2, resulting in weak bonding of the electrode 6 and making it difficult to adjust the position of the electrode 6 after bonding. In this embodiment, the electrode 6 is indirectly fixed to the support plate 2 and the inclined plate 41 by means of the first pressure plate 7 and the second pressure plate 8. The electrode 6 is fixed by locking and pressing, and the connection is still reliable. Moreover, the position of the electrode 6 can be adjusted before installing the first pressure plate 7 and the second pressure plate 8, which facilitates the adjustment of the position of the electrode 6.

[0069] Example 3:

[0070] In this embodiment, to ensure that the electrode 6 is tightly attached to the support plate 2, the positioning post 3 should ideally be able to press the electrode 6 onto the support plate 2. This allows for more accurate measurement of the angle of the inclined plate 41 when it breaks. Therefore, in this embodiment, the mounting hole on the mounting plate 21 is an oblong hole 22. In this embodiment, the oblong hole 22 is horizontally positioned, with the two ends of the oblong hole 22 being the first working position and the second working position, respectively. An elastic element 23 is also connected to the support plate 2. One end of the elastic element 23 is fixedly connected to the support plate 2, and the other end is connected to the mounting shaft 31 of the positioning post 3. The elastic element 23 can pull the positioning post 3. In the first working position, the positioning post 3 is attached to the support plate 2. In the second working position, the positioning post 3 is moved away from the support plate 2, leaving a gap to facilitate the passage of the electrode 6.

[0071] When the lithium-ion electrode flexibility performance testing device of this embodiment is not used, the elastic element 23 pulls the positioning post 3, and the outer cylindrical surface of the positioning post 3 is in close contact with the support plate 2. When the lithium-ion electrode flexibility performance testing device needs to be used to test the electrode 6, external force is used to move the positioning post 3 away from the support plate 2, leaving a gap, and the electrode 6 can pass through the gap. After the position of the electrode 6 is determined, the positioning post 3 is released. Under the action of the elastic element 23, the positioning post 3 can press the electrode 6.

[0072] In this embodiment, the elastic element 23 can be as follows: Figure 6 The spring shown has a contractile force, which can pull the positioning post 3 to fit against the support plate 2, or it can also be like... Figure 7 The elastic rope shown has a contractile force, which can pull the positioning post 3 to fit against the support plate 2. Of course, in addition to the spring and elastic rope mentioned above, other elastic parts can also be used, so that when the lithium-ion electrode flexibility performance testing device of this embodiment is not used, the elastic element 23 pulls the positioning post 3, and the outer cylindrical surface of the positioning post 3 is in close contact with the support plate 2.

[0073] In addition to using elastic elements 23 with contractile force, such as Figure 8 As shown, an elastic element 23 with a thrust can also be used. In this case, the end of the mounting plate 21 extends outward to form a mounting surface, and the elastic element 23 is connected to the mounting surface and the mounting shaft 31 of the positioning post 3. The elastic element 23 has an outward thrust, so that when the lithium-ion electrode flexibility performance testing device of this embodiment is not used, the elastic element 23 abuts against the positioning post 3, and the outer cylindrical surface of the positioning post 3 is in close contact with the support plate 2. When the lithium-ion electrode flexibility performance testing device needs to be used to test the electrode 6, the elastic element 23 is compressed by external force to move the positioning post 3 away from the support plate 2, leaving a gap, through which the electrode 6 can pass. After the position of the electrode 6 is determined, the positioning post 3 is released. Under the action of the elastic element 23, the positioning post 3 can press the electrode 6. At this time, the elastic element 23 can also be replaced by a spring sheet or other parts.

[0074] Example 4:

[0075] like Figure 9 , Figure 10 As shown, in this embodiment, an oblong hole 22 is opened on the mounting plate 21, and a locking groove 24 is opened at the bottom of both ends of the oblong hole 22. The locking groove 24 can move downward and lock into the locking groove 24 when the mounting shaft 31 moves to the oblong hole 22.

[0076] If the lithium-ion electrode flexibility performance testing device of this embodiment is not used, move the positioning post 3 to the second station and engage the mounting shaft 31 in the slot 24. When the lithium-ion electrode flexibility performance testing device is needed to test the electrode 6, the electrode 6 passes through the gap between the positioning post 3 and the support plate 2. Use external force to pull out the positioning post 3, disengage it from the right slot 24, and move it into the left slot 24 to be locked. The positioning post 3 can then press down on the electrode 6.

[0077] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for testing the flexibility of lithium-ion battery electrodes, characterized in that, It includes a workbench base, a support plate, a positioning post, a telescopic assembly, and a protractor used in conjunction with it; one end of the workbench base is connected to the bottom end of the support plate, the positioning post is movably connected to the top of the support plate, one end of the telescopic assembly is connected to the positioning post, and the other end is slidably connected along the length of the workbench base; during electrode testing, a gap is left between the positioning post and the support plate.

2. The lithium-ion battery electrode flexibility performance testing device according to claim 1, characterized in that, At least one guide rail is connected to the top surface of the workbench base along its length, and the guide rail is slidably connected to the slider; the other end of the telescopic component is movably connected to the slider.

3. The lithium-ion battery electrode flexibility performance testing device according to claim 1, characterized in that, The support plate and the workbench base are arranged at an angle, and the workbench base and the support plate are marked with graduations along their length and height.

4. The lithium-ion battery electrode flexibility performance testing device according to claim 1, characterized in that, Two mounting plates are connected to the support plate. Mounting holes are made on the mounting plates, and the mounting shafts at both ends of the positioning column are connected to the mounting holes.

5. The lithium-ion battery electrode flexibility performance testing device according to claim 4, characterized in that, The mounting hole is an oblong hole. The end of the oblong hole closer to the support plate is the first station, and the end of the oblong hole farther from the support plate is the second station. When the electrode is being tested, the positioning post is located at the first station, and when it is not being tested, the positioning post is located at the second station.

6. The lithium-ion battery electrode flexibility testing device according to claim 5, characterized in that, It also includes an elastic element with a slotted mounting hole. One end of the elastic element is connected to the support plate, and the other end is connected to the mounting shaft, forcing the positioning pin to fit tightly against the support plate.

7. The lithium-ion battery electrode flexibility performance testing device according to claim 5, characterized in that, It also includes an elastic element, with an oblong mounting hole. The end of the mounting plate away from the support plate is bent to one side. One end of the elastic element is connected to the mounting shaft, and the other end is connected to the bent part of the mounting plate, forcing the positioning post to fit tightly against the support plate.

8. A lithium-ion battery electrode flexibility performance testing device according to claim 5, characterized in that, The mounting hole is an oblong hole, with both ends extending outward along the height direction to form a locking groove. During electrode testing, the positioning post is engaged in the locking groove near the support plate, and when not being tested, the positioning post is engaged in the locking groove away from the support plate.

9. A lithium-ion battery electrode flexibility performance testing device according to claim 1, characterized in that, The telescopic assembly includes an inclined plate, a telescopic plate, and a locking knob. The top of the inclined plate is fixedly connected to the outer surface of the positioning column, and a slot is opened at the other end of the inclined plate. One end of the telescopic plate is inserted into the slot of the inclined plate, and the other end is slidably connected to the worktable base.

10. A lithium-ion battery electrode flexibility performance testing device according to claim 1, characterized in that, It also includes a first pressure plate and a second pressure plate, with the first pressure plate being detachably connected to the support plate and the second pressure plate being detachably connected to the top surface of the telescopic assembly.

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