Compression roller device for assisting in testing peeling strength of pole piece

Abstract

The utility model belongs to the technical field of battery preparation, and particularly relates to a compression roller device for assisting in testing the peel strength of a pole piece, which comprises a placing table, a compression roller mechanism and a driving mechanism, the compression roller mechanism is arranged on one side, in the first direction, of the placement table and can be in contact with the sample in the first direction; the driving mechanism can drive the compression roller mechanism to reciprocate in the second direction; compared with the prior art, the compression roller device disclosed by the utility model has the advantages that the pressure and the rolling speed in the pressing process of a test sample can be kept consistent, and the detection precision of the peeling strength of a pole piece is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing technology, and in particular relates to a pressure roller device for assisting in testing the peel strength of electrode sheets. Background Technology

[0002] In the secondary battery system of the new energy industry, the positive and negative electrode sheets mainly consist of current collectors and active material layers. The active material layer primarily comprises active material, conductive agents, and binders. The binder's role is to bond the conductive agent and active material to the current collector, preventing the electrode from expanding and detaching from the current collector during processing and cycling, which could lead to battery failure. Therefore, the peel strength of the electrode sheets is crucial to battery performance, significantly impacting battery lifespan and internal resistance. The sample preparation process for electrode peel strength testing also has a significant influence, primarily due to the pressure, number of rolling cycles, and the material of the rolling surface.

[0003] Current test sample preparation mainly involves manually pressing the test sample with a hand-held roller once or multiple times. However, the manual pressing process is physically demanding for workers, and variations in worker techniques make it impossible to maintain consistent pressure and speed during the pressing process. This affects the quality of the test sample preparation and consequently the accuracy of the electrode peel strength test. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a pressure roller device for assisting in testing the peel strength of electrode sheets. This pressure roller device can maintain consistent pressure and roller speed during the pressing process of the test sample, thus ensuring the accuracy of electrode sheet peel strength testing.

[0005] In view of this, the present invention provides a pressure roller device for assisting in testing the peel strength of electrode sheets, comprising:

[0006] A placement platform for placing samples;

[0007] The pressure roller mechanism is located on one side of the placement stage in the first direction and can contact the sample in the first direction;

[0008] The drive mechanism can drive the pressure roller mechanism to reciprocate in the second direction.

[0009] In this technical solution, the initially pressed sample is placed on the placement table along the second direction, so that the pressure roller mechanism contacts the sample in the first direction. At this time, the drive mechanism is activated to drive the pressure roller mechanism to reciprocate in the second direction to roll the sample, so that each position on the sample is tightly pressed. After the pressing is completed, the sample is removed.

[0010] In the above technical solution, the pressure roller mechanism further includes a roller body and a roller frame. The roller body is rotatably mounted on the roller frame. The roller body contacts the sample in a first direction. The driving mechanism is used to drive the roller frame to reciprocate in a second direction.

[0011] In the above technical solution, the pressure roller device further includes a frame, and the drive mechanism includes:

[0012] The lead screw is rotatably mounted on the frame, and its axis is located in the second direction;

[0013] The nut is mounted on the roller frame and is connected to the lead screw drive;

[0014] The power source can drive the lead screw to rotate and control the direction of rotation of the lead screw;

[0015] The guide element can limit the movement of the roller frame in the second direction.

[0016] In the above technical solution, two limit switches are further provided on the frame, the two limit switches are distributed at intervals along the first direction, and the limit switches can contact the roller frame.

[0017] In the above technical solution, a further step is to provide an unwinding roller on the frame, on which the tape is collected.

[0018] Furthermore, in the above technical solution, a scale is provided on the frame, and the scale is located on the side of the placement table near the unwinding roller.

[0019] In the above technical solution, a guide wheel is further provided on the side of the unwinding roller near the scale, and the guide wheel can guide the conveyor belt.

[0020] Furthermore, in the above technical solution, the length of the scale is adapted to the length of the sample.

[0021] In the above technical solution, the power source further includes a motor and a frequency converter.

[0022] In the above technical solution, a positioning groove is further provided on the placement stage, and the positioning groove is adapted to the contour of the sample.

[0023] The beneficial effects of this utility model are:

[0024] 1. Through the cooperation of the placement stage, the pressure roller mechanism, and the drive mechanism, after the sample is placed on the placement stage along the second direction, the pressure roller mechanism contacts the sample in the first direction. Then, the drive mechanism drives the pressure roller mechanism to reciprocate in the second direction to roll the sample. In this way, the rolling pressure and rolling speed can be kept consistent during the pressing process, ensuring the sample preparation quality and improving the accuracy of electrode peel strength detection.

[0025] 2. By setting an unwinding roller on the frame to collect the tape, preliminary sample preparation can be completed on the pressure roller device. After the preliminary sample preparation is completed, the sample can be pressed. The sample preparation efficiency is high and the operation is convenient.

[0026] 3. By setting a ruler on the frame, the required length of tape can be measured when cutting the tape, which can accurately cut the tape in a quantitative manner and reduce tape waste.

[0027] 4. By setting positioning grooves on the placement platform for sample placement, the difficulty of sample placement is reduced, while the stability of the sample during the pressing process is improved. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention in the first direction.

[0030] Figure 2 This is a three-dimensional structural diagram of the second direction of this utility model.

[0031] Figure 3 This is a schematic diagram of the main structure of this utility model.

[0032] Figure 4 This is a schematic diagram of the sample forming state in this utility model.

[0033] Figure 5 This is a schematic diagram of the sample disassembly state in this utility model.

[0034] The markings in the diagram are as follows:

[0035] 1. Placement platform; 101. Positioning groove; 2. Frame; 301. Roller body; 302. Roller frame; 401. Lead screw; 402. Nut; 403. Power source; 404. Guide component; 501. First limit switch; 502. Second limit switch; 6. Unwinding roller; 7. Belt; 8. Scale; 9. Guide wheel; 100. Sample; 200. Steel plate; 300. Electrode; X, First direction; Y, Second direction; Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] In the description of this utility model, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] Sample 100 in this utility model Figures 4-5 As shown, sample 100 includes steel plate 200, tape 7, and electrode 300. Steel plate 200 serves as the base layer. Tape 7 is a double-sided adhesive structure and can be commercially available 3M tape. One side of tape 7 is adhered to steel plate 200, and the other side is adhered to electrode 300. To facilitate peel testing of electrode 300, a small section of the end of electrode 300 needs to be peeled off for pre-peeling. Therefore, when cutting tape 7, the length of tape 7 should be slightly less than the length of electrode 300, so that part of electrode 300 is not adhered to tape 7, making it easier for workers to pre-peel sample 100.

[0039] Example 1

[0040] like Figures 1-3 As shown, this embodiment provides a pressure roller device for assisting in testing the peel strength of electrode sheets, including: a frame 2, a placement platform 1, a pressure roller mechanism, and a drive mechanism.

[0041] The frame 2 has an overall frame for the pressure roller device, which serves as the overall load-bearing part of the pressure roller device. The placement table 1 is set on the frame 2. The placement table 1 can place the sample 100. When the sample 100 is placed on the placement table 1, the side of the steel plate 200 with the electrode 300 attached should face upwards.

[0042] The pressure roller mechanism is located on the side of the placement table 1 in the first direction X, and can contact the sample 100 in the first direction X. For details, please refer to [link / reference needed]. Figure 1 The pressure roller mechanism includes a roller body 301 and a roller frame 302. The roller body 301 is rotatably mounted on the roller frame 302. The roller body 301 contacts the sample 100 in the first direction X. The width of the roller body 301 is greater than the width of the electrode 300. The standard weight of the roller body 301 is 5 kg. The roller frame 302 is mounted on the frame 2. The drive mechanism is used to drive the roller frame 302 to reciprocate in the second direction Y.

[0043] Specifically, the drive mechanism includes: a lead screw 401, a nut 402, a power source 403, and a guide component 404;

[0044] Please see Figure 1 or Figure 2 The lead screw 401 is rotatably mounted on the frame 2, and the axis of the lead screw 401 is located in the second direction Y.

[0045] Nut 402 is mounted on roller frame 302. Nut 402 is coaxially distributed with lead screw 401 and is connected to lead screw 401 in a transmission manner.

[0046] The power source 403 can drive the lead screw 401 to rotate and control the rotation direction of the lead screw 401. In this embodiment, the power source 403 includes a motor and a frequency converter. The motor is connected to the frequency converter and then connected to the lead screw 401. The speed range of the frequency converter is 10cm / min to 200cm / min, and 60cm / min is preferred for testing.

[0047] The guide member 404 can limit the movement of the roller frame 302 in the second direction Y. In this embodiment, the guide member 404 includes a guide rod and a guide through hole. The guide rod is disposed on the frame 2 and is distributed parallel to the lead screw 401. The guide through hole is disposed on the roller frame 302 and the roller frame 302 is slidably connected to the guide rod through the guide through hole.

[0048] In this embodiment, two limit switches are provided on the frame 2. The two limit switches are spaced apart along the first direction X. The limit switches can contact the roller frame 302. Both limit switches are electrically connected to the power source 403. The two limit switches are defined as the first limit switch 501 and the second limit switch 502, respectively. For details, please refer to [link to relevant documentation]. Figure 3 ,according to Figure 3In the orientation sequence, the first limit switch 501 is located on the right side of the roller frame 302, and the second limit switch 502 is located on the left side of the roller frame 302. During the movement of the pressure roller mechanism to the right, when the roller frame 302 contacts the first limit switch 501, the power source 403 changes the driving direction of the lead screw 401, causing the roller frame 302 to move to the left. When the roller frame 302 contacts the second limit switch 502, the power source 403 changes the driving direction of the lead screw 401 again, causing the roller frame 302 to move to the right again, thereby realizing the reciprocating motion of the pressure roller mechanism in the second direction Y.

[0049] The procedure for performing a peel strength test on electrode 300 in this embodiment is as follows:

[0050] S1, cut the electrode sheet 300 required for the peel strength test;

[0051] S2, cut the tape to the appropriate length 7;

[0052] S3, stick one side of the tape 7 to the steel plate 200 and the other side to the coating layer of the electrode 300;

[0053] S4, place the steel plate 200 on the placement table 1 with the side with the electrode 300 facing up, and make the electrode 300 contact the roller body 301 in the first direction X. Then start the power source 403 to drive the lead screw 401 to rotate. The lead screw 401 and the nut 402 drive the roller frame 302 to move back and forth in the second direction Y, and perform reciprocating rolling on the sample 100.

[0054] S5, pre-peel the pressed sample 100;

[0055] S6. The pre-peeled sample 100 is fixed to one end of the tensile tester to test the peel strength of the electrode 300.

[0056] Example 2

[0057] This embodiment provides a pressure roller device for assisting in testing the peel strength of electrode sheets. In addition to the technical solutions of the above embodiments, the pressure roller device has also been optimized.

[0058] Please see Figure 2 In this embodiment, an unwinding roller 6 is provided on the frame 2. The unwinding roller 6 is rotatably connected to the frame 2. The unwinding roller 6 collects tape 7. Specifically, the tape 7 is wound on the unwinding roller 6. Both surfaces of the tape 7 have an isolation layer to prevent adjacent tapes 7 from sticking together.

[0059] In this embodiment, after the electrode sheet 300 is cut, preliminary sample preparation can be completed next to the pressure roller device. Specifically, the tape 7 is pulled out from the unwinding roller 6 and stretched along the second direction Y. After stretching, a suitable length of tape 7 is cut for preliminary sample preparation. After the preliminary sample preparation is completed, the sample 100 can be pressed. This eliminates the need to take the tape 7 separately, resulting in high sample preparation efficiency and convenient operation.

[0060] Example 3

[0061] This embodiment provides a pressure roller device for assisting in testing the peel strength of electrode sheets. In addition to the technical solutions of the above embodiments, the pressure roller device has been further optimized.

[0062] Please see Figure 2 In this embodiment, a ruler 8 is provided on the frame 2. The ruler 8 is located on the side of the placement table 1 near the unwinding roller 6. Specifically, the length of the ruler 8 is adapted to the length of the sample 100. In this way, when cutting the tape 7, the ruler 8 is used to measure the required length of the tape 7, so that the tape 7 can be accurately and quantitatively cut, reducing the waste of tape 7.

[0063] Example 4

[0064] This embodiment provides a pressure roller device for assisting in testing the peel strength of electrode sheets. In addition to the technical solutions of the above embodiments, the pressure roller device has been further optimized.

[0065] Please see Figure 2 In this embodiment, a guide wheel 9 is provided on the side of the unwinding roller 6 near the scale 8. The height of the guide wheel 9 on the frame 2 is close to the height of the scale 8. The guide wheel 9 can guide the tape 7, which makes it easier to stretch the tape 7 along the second direction Y, and facilitates comparison with the scale 8 and cutting.

[0066] Example 5

[0067] This embodiment provides a pressure roller device for assisting in testing the peel strength of electrode sheets. In addition to the technical solutions of the above embodiments, the pressure roller device has been further optimized.

[0068] In the aforementioned embodiment, since the steel plate 200 has a certain weight, placing the sample 100 on the placement table 1 will not affect the reciprocating rolling pressure of the pressure roller mechanism on the sample 100 even if the sample 100 is not positioned or clamped. However, to ensure the pressing effect of the sample 100, please refer to [the relevant documentation]. Figure 3 In this embodiment, a positioning groove 101 is provided on the placement stage 1, and the positioning groove 101 is adapted to the contour of the sample 100.

[0069] When placing sample 100, placing steel plate 200 into positioning groove 101 can limit the positional displacement of sample 100 during the rolling process of pressure roller mechanism;

[0070] In addition, after the steel plate 200 is placed into the positioning groove 101, a portion of the upper part of the steel plate can extend out of the positioning groove 101, which makes it easier for workers to remove the steel plate 200 from the positioning groove 101.

[0071] The embodiments of the present invention have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A press roll device for assisting in testing tab peel strength, characterized by, The utility model relates to a sample pressing roller device, including: A placing table (1) can place a sample (100); A pressing roller mechanism is arranged on one side of the placing table (1) in a first direction (X) and can contact the sample (100) in the first direction (X); A driving mechanism can drive the pressing roller mechanism to reciprocate in a second direction (Y); The pressing roller device further comprises a rack (2); A pay-off roller (6) is arranged on the rack (2), and the pay-off roller (6) collects an adhesive tape (7); A scale (8) is arranged on the rack (2), and the scale (8) is arranged on one side of the placing table (1) close to the pay-off roller (6); A positioning groove (101) is arranged on the placing table (1), and the positioning groove (101) is matched with the contour of the sample (100).

2. The press roll apparatus for assisting in testing tab peel strength of claim 1, wherein: The pressing roller mechanism comprises a roller body (301) and a roller frame (302), the roller body (301) is rotatably arranged on the roller frame (302), the roller body (301) contacts the sample (100) in the first direction (X), and the driving mechanism is used for driving the roller frame (302) to reciprocate in the second direction (Y).

3. The press roll apparatus for assisting in testing tab peel strength of claim 2, wherein: The driving mechanism comprises: A lead screw (401) is rotatably arranged on the rack (2), and the axis thereof is located in the second direction (Y); A nut (402) is arranged on the roller frame (302) and is in transmission connection with the lead screw (401); A power source (403) can drive the lead screw (401) to rotate and can control the rotating direction of the lead screw (401); A guide member (404) can limit the movement of the roller frame (302) in the second direction (Y).

4. The press roll apparatus for assisting in testing tab peel strength of claim 3, wherein: Two travel switches are arranged on the rack (2), the two travel switches are distributed at intervals along the first direction (X), and the travel switches can contact the roller frame (302).

5. The press roll apparatus for assisting in testing the tab peel strength of claim 1, wherein: A guide wheel (9) is arranged on one side of the pay-off roller (6) close to the scale (8), and the guide wheel (9) can guide the adhesive tape (7).

6. The press roll apparatus for assisting in testing tab peel strength of claim 1, wherein: The length of the scale (8) is matched with the length of the sample (100).

7. The press roll apparatus for assisting in testing tab peel strength of claim 3, wherein: The power source (403) comprises a motor and a frequency converter.

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