Fatigue resistance testing device and method for electrode tabs

Abstract

The application relates to the technical field of performance detection of electrode pole pieces, and particularly provides an anti-fatigue performance detection device and detection method of an electrode pole piece, aiming to solve the problems of raw material waste and low processing efficiency caused by electrode pole piece breakage. For the purpose, the anti-fatigue performance detection device of the electrode pole piece comprises a rack, a sliding seat, at least one rotating roller arranged on the sliding seat, a first supporting roller and a second supporting roller, the first supporting roller and the second supporting roller are arranged on the rack and located on the two sides of the sliding seat respectively, so that the electrode pole piece can sequentially wind around the first supporting roller, the rotating roller and the second supporting roller, a driver connected with the sliding seat and used for driving the sliding seat to reciprocate along the rack, a counter used for counting the reciprocation times of the sliding seat, and a tension applying device used for applying tension to the electrode pole piece. The application can reduce the waste of raw materials and improve the production quality and production efficiency of the electrode pole piece.

Description

Technical Field

[0001] This application relates to the field of electrode performance testing technology, specifically providing an electrode fatigue performance testing device and testing method. Background Technology

[0002] Electrode strips often break during the slitting and winding process. When the electrode strip breaks, it will cause the equipment to stop and waste raw materials.

[0003] In related technologies, the method of analyzing each broken electrode sheet after the electrode sheet breaks is adopted. However, this method cannot accurately determine the cause of the breakage. Moreover, analyzing the electrode sheet after it breaks still cannot solve the problems of equipment downtime and waste of raw materials caused by the breakage of the electrode sheet.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] This application aims to solve the above-mentioned technical problems, namely, to solve the problems of raw material waste and low processing efficiency caused by electrode sheet breakage.

[0006] In a first aspect, this application provides a device for testing the fatigue resistance of electrode sheets, comprising:

[0007] frame;

[0008] A sliding seat is slidably mounted on the frame, and at least one rotating roller is provided on the sliding seat;

[0009] The first support roller and the second support roller are both disposed on the frame, and the first support roller and the second support roller are respectively located on both sides of the sliding seat, so that the electrode sheet can be sequentially wound around the first support roller, the rotating roller and the second support roller;

[0010] A driver, connected to the sliding seat, is used to drive the sliding seat to reciprocate along the frame;

[0011] A counter is used to count the number of reciprocating movements of the sliding block; and

[0012] A tension applying device for applying tension to the electrode plates.

[0013] In one technical solution of the above-mentioned fatigue resistance testing device, the rotating roller includes a first rotating roller and a second rotating roller, and the electrode sheet can be sequentially wound around the first support roller, the first rotating roller, the second rotating roller and the second support roller.

[0014] In one technical solution of the above-mentioned fatigue performance testing device, at least two positioning grooves are provided on the sliding seat, and at least one of the first rotating roller and the second rotating roller can be detachably connected to the positioning groove to adjust the relative position of the first rotating roller and the second rotating roller.

[0015] In one technical solution of the above-mentioned fatigue resistance testing device, the tension application device includes:

[0016] A bracket is mounted on the frame;

[0017] A load roller is disposed at the top of the support, and the electrode plates can sequentially pass around the second support roller and the load roller.

[0018] In one technical solution of the above-mentioned fatigue performance testing device, the tension application device further includes a force sensor, which is disposed on the support and is used to detect the pressure value borne by the load roller.

[0019] In one technical solution of the above-mentioned fatigue resistance testing device, the fatigue resistance testing device further includes:

[0020] A third support roller is disposed on the frame, and the third support roller and the second support roller are located on different sides of the load roller.

[0021] In one technical solution of the above-mentioned fatigue resistance testing device, the third support roller and the second support roller are symmetrically arranged relative to the load roller.

[0022] In one technical solution of the above-mentioned fatigue resistance testing device, the counter includes two counting pins, both of which are disposed on the frame, and the two counting pins can be electrically connected to the two ends of the electrode plate respectively.

[0023] In one technical solution of the above-mentioned fatigue resistance testing device, the counting guide needle is also used to fix the end of the electrode plate.

[0024] In one technical solution of the above-mentioned fatigue performance testing device, a shock-absorbing pad is provided at the bottom of the frame.

[0025] Secondly, this application provides a method for testing the fatigue resistance of an electrode sheet, which employs a fatigue resistance testing device, the fatigue resistance testing device comprising:

[0026] frame;

[0027] A sliding seat is slidably mounted on the frame, and at least one rotating roller is provided on the sliding seat;

[0028] The first support roller and the second support roller are both disposed on the frame, and the first support roller and the second support roller are respectively located on both sides of the sliding seat, so that the electrode sheet can be sequentially wound around the first support roller, the rotating roller and the second support roller;

[0029] A driver, connected to the sliding seat, is used to drive the sliding seat to reciprocate along the frame;

[0030] A counter is used to count the number of reciprocating movements of the sliding block; and

[0031] A tension applying device for applying tension to the electrode plates;

[0032] The detection method includes:

[0033] The electrode sheet is sequentially passed around the first support roller, the rotating roller, and the second support roller, and both ends of the electrode sheet are fixed.

[0034] Connect the counter to the electrode plate in a conductive manner;

[0035] A load is applied to the electrode plate by the tension application device;

[0036] Controlling the reciprocating motion of the sliding block; and

[0037] The counter counts the number of reciprocating movements of the sliding block.

[0038] In one technical solution of the above-mentioned method for testing the fatigue resistance of electrode sheets, the rotating roller includes a first rotating roller and a second rotating roller, and the sliding seat is provided with at least two positioning grooves, at least one of the first rotating roller and the second rotating roller can be detachably connected to the positioning groove;

[0039] The detection method further includes:

[0040] Adjust the relative positions of the first roller and the second roller.

[0041] As described above, using the technical solution of this application, fatigue performance testing is performed on the electrode sheets before they are put into processes such as slitting and winding. The reciprocating motion of the sliding seat causes the first and second rollers to move relative to the electrode sheets. During this movement, different positions of the electrode sheets are subjected to bending and compression, thus simulating the actual state of the electrode sheets in subsequent processing. Simultaneously, a tension application device monitors the tension on the electrode sheets in real time to match the stress state during the processing. Finally, the fatigue performance of the electrode sheets is reflected by counting the number of reciprocating motions of the sliding seat. In this way, the fatigue performance of the electrode sheets can be pre-detected and judged, and the decision to proceed with further production processing or adjust the process parameters of upstream processes can be made based on the test results. This reduces the waste of raw materials and the probability of equipment downtime. Furthermore, the process parameters of upstream processes can be adjusted based on the test results to improve the production quality and efficiency of the electrode sheets. Attached Figure Description

[0042] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0043] Figure 1 This is a schematic diagram of the fatigue resistance testing device for electrode sheets provided in the embodiments of this application;

[0044] Figure 2 yes Figure 1 A schematic diagram of the tension application device.

[0045] Figure 3 This is a schematic diagram of the detection status of the electrode sheet under a bending angle of 180°, as provided in an embodiment of this application.

[0046] Figure 4 This is a schematic diagram of the detection status of the electrode sheet under a bending angle of 90°, as provided in the embodiments of this application.

[0047] Figure 5 This is a flowchart of the steps for testing the fatigue resistance of electrode sheets according to an embodiment of this application.

[0048] List of reference numerals :

[0049] 1. Frame; 11. Shock-absorbing pad; 12. Display panel; 2. Sliding seat; 21. First rotating roller; 22. Second rotating roller; 23. Positioning groove; 31. First support roller; 32. Second support roller; 33. Third support roller; 4. Counter; 5. Tension application device; 51. Support; 52. Force sensor; 53. Loading roller. Detailed Implementation

[0050] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0051] It should be noted that in the description of this application, terms such as "upper," "lower," "inner," and "outer," which indicate direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the relevant device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] Electrode breakage during slitting and winding can have multiple causes. For example, uneven coating thickness on the current collector surface can lead to S-shaped edges and wrinkles during rolling, causing uneven tension and breakage. Excessive rolling deformation can cause the coating to embed into the current collector, resulting in numerous defects and breakage. Burrs or other damage during slitting can cause stress concentration as the current collector passes through the rollers, leading to breakage. Low current collector strength and elongation can also prevent timely absorption of tension fluctuations, causing breakage. Therefore, analyzing each breakage individually and adjusting only one process parameter after it occurs not only fails to ensure accuracy but also risks overgeneralization.

[0054] Analyzing the state of the electrode sheet during the slitting and winding processes reveals that the electrode sheet rotates continuously around the roller under tension. During repeated bending and extrusion, the defects in the electrode sheet are gradually magnified, eventually leading to electrode breakage. Therefore, electrode breakage is a fatigue fracture failure phenomenon. Consequently, this application proposes a fatigue resistance testing device for electrode sheets. Before the electrode sheet enters the slitting and winding processes, its fatigue resistance is tested to reflect the performance of the electrode sheet and reduce the waste of raw materials.

[0055] Reference Figure 1This application discloses an electrode fatigue performance testing device, which includes a frame 1, a sliding seat 2, a first support roller 31, a second support roller 32, a counter 4, and a tension application device 5.

[0056] The sliding seat 2 is slidably mounted on the frame 1, and the frame 1 is also equipped with a driver (not shown in the figure), which is connected to the sliding seat 2. For example, in one implementation, a linear guide rail can be provided on the frame 1, and when the driver is working, it drives the sliding seat 2 to perform reciprocating linear motion along the linear guide rail.

[0057] The sliding seat 2 is equipped with a rotating roller, and one or more rotating rollers can be provided according to actual space requirements. In one possible implementation of this application, two rotating rollers are provided, including a first rotating roller 21 and a second rotating roller 22.

[0058] The first support roller 31 and the second support roller 32 are both fixedly mounted on the frame 1, and are located on opposite sides of the sliding seat 2. Electrode sheets can be sequentially wound around the first support roller 31, the first rotating roller 21, the second rotating roller 22, and the second support roller 32. In this embodiment, by setting two rotating rollers, the first support roller 31 and the second support roller 32, the winding state of the electrode sheet during the slitting and winding process can be simulated. Furthermore, more rotating rollers can be set and / or the positional relationship between the rotating rollers can be adjusted to simulate different winding states of the electrode sheet. Meanwhile, the first support roller 31 and the second support roller 32 are not limited to being located on opposite sides of the sliding seat 2. In some other implementations, the first support roller 31 and the second support roller 32 can also be located on the same side of the sliding seat 2, as long as the electrode sheet can be sequentially wound around the first support roller 31, the first rotating roller 21, the second rotating roller 22, and the second support roller 32. This application does not limit the specific positions of the first support roller 31 and the second support roller 32.

[0059] The counter 4 and the tension application device 5 are both fixedly mounted on the frame 1. The counter 4 is used to count the number of reciprocating movements of the sliding seat 2, and the tension application device 5 is used to apply tension to the electrode plates.

[0060] In one possible implementation of this application, the counter 4 includes two counting pins, one of which is positioned near the first support roller 31 and the other near the second support roller 32. The two counting pins are electrically connected to the electrode plates, forming a complete circuit. When the electrode plate breaks, this circuit is broken, and the counting pins can then determine that the electrode plate has broken. Furthermore, the counting pins can also be used to fix the ends of the electrode plates.

[0061] When testing the fatigue resistance of the electrode sheet using the testing device of this application, the electrode sheet is first sequentially passed around the first support roller 31, the first rotating roller 21, the second rotating roller 22, and the second support roller 32. One end of the electrode sheet is then fixedly connected to the first support roller 31 or the counting guide needle, and the counting guide needle is then connected to the electrode sheet. A load is then applied to the electrode sheet using the tension applying device 5 to provide tension. Finally, the sliding seat 2 is controlled to reciprocate linearly along the linear guide rail. During this process, the first rotating roller 21 and the second rotating roller 22 move relative to the electrode sheet. When the electrode sheet breaks, the sliding seat 2 stops moving, and the number of reciprocating movements of the sliding seat 2 is counted using the counter 4.

[0062] In another embodiment, the preset performance of the electrode sheet can be set according to production needs, including the corresponding tension value and the preset number of reciprocating movements of the sliding seat 2, and the above test experiment can be performed. If the electrode sheet breaks before the preset number of movements is reached, it is determined that the electrode sheet has not reached the corresponding preset performance; conversely, if the electrode sheet does not break after the preset number of movements is reached, it is determined that the electrode sheet meets the corresponding preset performance, and the experiment can be terminated at this time.

[0063] Using the above method, fatigue performance testing is performed on the electrode sheets before they are put into processes such as slitting and winding. The reciprocating motion of the sliding seat 2 causes the first roller 21 and the second roller 22 to move relative to the electrode sheets. During this motion, different positions of the electrode sheets are subjected to bending and compression, simulating the actual state of the electrode sheets in subsequent processing. Simultaneously, the tension applied to the electrode sheets is monitored in real time by the tension application device 5 to match the stress state during processing. Finally, the fatigue performance of the electrode sheets is reflected by counting the number of reciprocating motions of the sliding seat 2. In this way, the fatigue performance of the electrode sheets can be pre-tested and judged, and the decision to proceed with further production processing or adjust the process parameters of upstream processes can be made based on the test results. This reduces raw material waste and the probability of equipment downtime. Furthermore, the process parameters of upstream processes can be adjusted based on the test results to improve the production quality and efficiency of the electrode sheets. Specifically, the magnitude of the force and the total number of bends on the electrode sheets during each production process can be adjusted to not exceed the set values ​​of the test experiment.

[0064] In some possible implementations of this application, the tension applying device 5 can also be used to detect the tension on the electrode sheet and adjust the applied load according to the detected tension value to meet the test requirements. For example, when applying a counterweight to the end of the electrode sheet, the tension value is monitored in real time by a sensor or other detection device, and the number of counterweights is adjusted according to the test requirements.

[0065] Reference Figure 1In one possible implementation of this application, the sliding seat 2 is further provided with a positioning groove 23. The number of positioning grooves 23 is at least two, and at least one of the first rotating roller 21 and the second rotating roller 22 can be detachably connected in different positioning grooves 23. Specifically, the inner wall of the positioning groove 23 can be provided with threads or a snap-fit ​​structure, and the first rotating roller 21 or the second rotating roller 22 is threadedly connected or snap-fit ​​connected to the positioning groove 23.

[0066] For example, there are two positioning slots 23. The first rotating roller 21 is fixed to the sliding seat 2, and the second rotating roller 22 is detachably connected to the sliding seat 2. In this case, connecting the second rotating roller 22 to different positioning slots 23 can change the bending angle of the electrode sheet. See the following two examples for details:

[0067] The first type, referring to Figure 3 When the electrode plates are sequentially wound around the first support roller 31, the first rotating roller 21, the second rotating roller 22 and the second support roller 32, the planes formed by the different positions of the electrode plates are parallel to each other. At this time, the bending angle of the electrode plates is 180°. When the sliding seat 2 reciprocates, the above multiple planes are always parallel. In this state, the working condition of the electrode plates bending at a bending angle of 180° is simulated.

[0068] The second method, refer to Figure 4 When the electrode plates are sequentially wound around the first support roller 31, the first rotating roller 21, the second rotating roller 22 and the second support roller 32, the planes formed by the different positions of the electrode plates are perpendicular to each other. At this time, the bending angle of the electrode plates is 90°. When the sliding seat 2 reciprocates, the above multiple planes are always perpendicular. In this state, the working condition of the electrode plates bending at a 90° angle is simulated.

[0069] Therefore, by setting the positioning groove 23, the relative position of the first rotating roller 21 and the second rotating roller 22 can be changed, thereby changing the bending angle of the electrode sheet. This can meet the different working conditions in the actual processing of the electrode sheet, thereby improving the universality of the detection device of this application.

[0070] It should be understood that the configuration of the first rotating roller 21 and the second rotating roller 22 in this application is not limited to the above two situations. Depending on the actual working conditions, the bending angle of the electrode sheet can also be adjusted to, for example, 30°, 120°, etc.

[0071] It should also be understood that the number of rollers on the sliding seat 2 is not limited to two; for example, it can be one or more than three. When there are multiple rollers, the relative positions between the multiple rollers can be adjusted to fit the actual working conditions.

[0072] Correspondingly, based on actual production needs, multiple different bending angles of the electrode sheets and their corresponding tensions and preset number of bends can be set in a single experimental test.

[0073] Reference Figure 2 As one possible implementation of this application, the tension application device 5 includes a bracket 51, force sensors 52, and a load roller 53. The bracket 51 can be fixedly mounted on the frame 1, and the load roller 53 is fixedly mounted or rotatably mounted on the top of the bracket 51, with the load roller 53 parallel to the second support roller 32. Two force sensors 52 can be provided, located below the two ends of the load roller 53 respectively, thereby improving detection accuracy.

[0074] During actual installation, the electrode sheet sequentially passes around the second support roller 32 and the load roller 53. The downward pressure on the load roller 53 is detected by the force sensor 52, thus reflecting the magnitude of the tension on the electrode sheet. Specifically, the projection of the pressure value detected by the force sensor 52 onto the plane formed by the second support roller 32 and the load roller 53 is the tension value of the electrode sheet.

[0075] Furthermore, a third support roller 33 is fixedly installed on the frame 1, and the third support roller 33 and the second support roller 32 are located on different sides of the load roller 53. The electrode plates are sequentially passed around the load roller 53 and the third support roller 33, so that the ends of the electrode plates are away from the tension application device 5, thereby making it easier to add counterweights.

[0076] Optionally, if the third support roller 33 and the second support roller 32 are symmetrically arranged with respect to the load roller 53, then the planes formed by the electrode plates on both sides of the load roller 53 are symmetrically arranged with respect to the vertical plane where the load roller is located, thus making it easier to reflect the magnitude of the tension value.

[0077] Reference Figure 1 The bottom of the frame 1 is also fixedly equipped with a shock-absorbing pad 11, which reduces the vibration of the equipment and thus reduces the impact of vibration on the test results.

[0078] The frame 1 is equipped with a display panel 12 and a control module electrically connected to the display panel 12. The display panel 12 can display parameters such as tension value and the movement speed of the slide seat 2.

[0079] Reference Figure 5 This application also discloses a method for testing the fatigue resistance of electrode sheets, using the fatigue resistance testing device described in the above embodiments, which includes the following steps:

[0080] S101: Prepare the electrode sheet to be tested, pass the electrode sheet sequentially around the first support roller 31, the rotating roller and the second support roller 32, and fix both ends of the electrode sheet.

[0081] In step S101, when there are multiple rotating rollers, the electrode plates can be sequentially passed around the multiple rotating rollers.

[0082] S102: Connect counter 4 to the electrode plate.

[0083] S103: Apply a load to the electrode plate and detect the tension on the electrode plate through the tension application device 5, and adjust the load according to actual needs.

[0084] S104: Controls the reciprocating motion of the sliding block 2.

[0085] S105: When the electrode plate breaks, the counter 4 counts the number of reciprocating motions of the sliding seat 2.

[0086] It should be noted that when there are multiple rotating rollers, before step S101, step S1011 is also included: adjusting the relative position between the first rotating roller 21 and the second rotating roller 22 according to the working conditions to be detected.

[0087] In some implementations, in step S103, the tension on the electrode sheet can be detected by the tension applying device 5, and the applied load value can be adjusted according to the detection result.

[0088] In actual testing, the accuracy of the test results can be improved by taking the average of multiple tests.

[0089] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A device for testing the fatigue resistance of electrode sheets, characterized in that, include: frame; A sliding seat is slidably mounted on the frame, and at least one rotating roller is provided on the sliding seat; The first support roller and the second support roller are both disposed on the frame. The electrode plates can be sequentially wound around the first support roller, the rotating roller and the second support roller. A driver, connected to the sliding seat, is used to drive the sliding seat to reciprocate along the frame; A counter is used to count the number of reciprocating movements of the sliding block; as well as A tension applying device for applying tension to the electrode plates; The counter includes two counting pins, both of which are disposed on the frame. One counting pin is disposed near the first support roller, and the other counting pin is disposed near the second support roller. The two counting pins can be electrically connected to the electrode plates respectively. One end of the electrode sheet is fixedly connected to the first support roller or the counting guide needle, and the other end of the electrode sheet is connected to the tension applying device.

2. The fatigue resistance testing device according to claim 1, characterized in that, The rotating roller includes a first rotating roller and a second rotating roller, and the electrode sheet can be sequentially wound around the first support roller, the first rotating roller, the second rotating roller and the second support roller.

3. The fatigue property testing device according to claim 2, wherein The sliding seat has at least two positioning grooves, and at least one of the first roller and the second roller can be detachably connected to the positioning groove to adjust the relative position of the first roller and the second roller, thereby changing the bending angle of the electrode sheet.

4. The fatigue property testing device according to claim 1, wherein The tension applying device includes: A bracket is mounted on the frame; A load roller is disposed at the top of the support, and the electrode plates can sequentially pass around the second support roller and the load roller.

5. The fatigue property detection device according to claim 4, wherein The tension application device also includes a force sensor, which is mounted on the bracket and is used to detect the pressure value borne by the load roller.

6. The fatigue resistance testing device according to claim 4, characterized in that, The fatigue resistance testing device also includes: A third support roller is disposed on the frame, and the third support roller and the second support roller are located on different sides of the load roller.

7. A method for testing the fatigue resistance of an electrode sheet, characterized in that, The fatigue performance is tested using a fatigue performance testing device, which includes: frame; A sliding seat is slidably mounted on the frame, and at least one rotating roller is provided on the sliding seat; The first support roller and the second support roller are both disposed on the frame, and the first support roller and the second support roller are respectively located on both sides of the sliding seat, so that the electrode sheet can be sequentially wound around the first support roller, the rotating roller and the second support roller; A driver, connected to the sliding seat, is used to drive the sliding seat to reciprocate along the frame; A counter is used to count the number of reciprocating movements of the sliding block; and A tension applying device for applying tension to the electrode plates; The detection method includes: The electrode sheet is sequentially passed around the first support roller, the rotating roller, and the second support roller, and both ends of the electrode sheet are fixed. Connect the counter to the electrode plate in a conductive manner; A load is applied to the electrode plate by the tension application device; Controlling the reciprocating motion of the sliding block; and The counter counts the number of reciprocating movements of the sliding block.

8. The fatigue resistance testing method according to claim 7, characterized in that, The rotating roller includes a first rotating roller and a second rotating roller. The sliding seat has at least two positioning grooves. At least one of the first rotating roller and the second rotating roller can be detachably connected to the positioning groove. The detection method further includes: Adjust the relative positions of the first roller and the second roller.

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